Base station, mobile station and synchronisation channel transmission method

FIELD: information technology.

SUBSTANCE: invention discloses a base station used in a mobile communication system comprising several cells consisting of several sectors. The base station has a synchronisation channel generating unit which generates a synchronisation channel for use during cell search by a user terminal, and a transmission unit which wirelessly transmits a signal, having a synchronisation channel. The synchronisation channel has a primary synchronisation channel and a secondary synchronisation channel. The primary synchronisation channel has a series of several types, and the secondary synchronisation channel, transmitted to a cell sector, has a code, predetermined based on a given polynomial generating equation, which corresponds to the primary synchronisation channel.

EFFECT: reduced effect of intersymbol interference and shorter time for cell search.

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The technical field to which the invention relates.

The present invention relates to a communication system in which downlink communication scheme is applied OFDM (Orthogonal Frequency Division Multiplexing, multiplexing orthogonal frequency division), and more specifically to a base station, mobile station and method of transmission of the sync channel.

The level of technology

The 3GPP group working on the standardization of Protocol W-CDMA, as a next generation system, superseding the systems W-CDMA and HSDPA, took into consideration the communication scheme LTE (Long Term Evolution, long-term technology development), while schemes OFDM and SC-FDMA (Single-Carrier Frequency Division Multiple Access, multiple access with crossover frequency and single-carrier) are considered as radio access schemes that are applied, respectively, for both ascending and descending lines. See, for example, the document 3GPP TR 25.814 (V7.0.0), "Physical Layer Aspects for Evolved UTRA" (June 2006).

The OFDMA scheme is a transmission scheme in which a frequency band is divided into several narrower bands (subcarriers)and data is being transmitted in the respective frequency bands. Subcarriers are placed close to each other, not interferir with each other, while some of them may overlap, thus achieving high transmission rate and increases the efficiency is of Ascot.

SC-FDMA is a transmission scheme in accordance with which the frequency band is divided into segments, and data multiple terminals use different segments of the frequency band, resulting in reduced levels of interference between terminals. In the scheme of SC-FDMA transmit power varies slightly, making it possible to provide a low level of consumption of the terminal capacity and wide coverage.

In the LTE system in order to reduce the effects of intersymbol interference in the delay waves for OFDM scheme as a cyclic prefix (CP Cyclic Prefix) used CF of different length, it is long CP and short CF. For example, long SR are used in cells with large radii or transmission type MBMS (Multimedia Broadcast Multicast Service, the multicast/broadcast multimedia transmission), while the short SR are used in cells with small radii. In the case of the use of long CF in one time interval (slot) includes six OFDM symbols. On the other hand, in the case of the use of short CF in one time interval includes seven OFDM symbols.

At the same time, usually mobile station when turned on, waiting periods, in connection or intermittent receiving when making communications needs on the basis of synchronization signals or other the signals to detect the honeycomb, providing the best quality of radio communications in the communication system using the technology of W-CDMA, LTE or other technologies. This process is called "cell search", since it involves searching cell to which you want to connect to radio communications. Way to search cell is selected depending on the amount of time required to perform such a search, and load data for mobile stations in the cell search process. In other words, the cell search must be performed in a short period of time and do not require in the process of executing a significant burden on data processing for the mobile stations.

In the system of the W-CDMA search cell uses the synchronization signals of two types: P-SCH (Primary SCH, primary sync channel) and S-SCH (Secondary SCH, secondary sync channel). Within the LTE system to search for honeycomb also discusses the use of synchronization signals of two types: P-SCH and S-SCH.

For example, you learned how search cell, in accordance with which every 5 MS the signal is transmitted P-SCH, containing a single sequence, and the S-SCH containing multiple sequences. See, for example, document R1-062990 "Outcome of cell search drafting session. In accordance with this method, the moments of reception of the hundred in the downlink are identified on the basis of the P-SCH, BP is me as the detection timing of received frames and definition for individual cell information, such as cell identifiers (cell ID) or the hundred group (group IDs), is based on the S-SCH transmitted in the same time interval. Typically, the value of the channel estimation obtained on the basis of the P-SCH may be used for demodulation and decoding of the S-SCH. For grouping cells IDs the ID of the corresponding cell is then determined from the number of cells IDs belonging detektirovaniem group identifier hundred. For example, the cell ID can be obtained based on a template (schema) of the pilot signal. As another example, the cell ID can be obtained on the basis of the demodulation and decoding of the P-SCH and S-SCH. Alternatively, the cell ID may be included as an information item S-SCH without performing grouping of cells IDs. In this case, the mobile station can detect the cell ID at the time of demodulation and decoding of the S-SCH.

However, if you use the above method of cell search, the S-SCH transmitted in various sequences of several hundred can be demodulated and decoded in the system with inter-station synchronization, in which signals from various hundred synchronize with each other, in accordance with the values of the channel estimation is obtained based on the signals P-SCH, transferred from the honeycomb in identical sequences, which can lead to the deterioration of the transmission characteristics for the S-SCH. In this case, the transmission characteristics include the period of time required for cell search. On the other hand, in the system without inter-station synchronization, in which signals from various hundred are not synchronized with each other, the moments of reception of signals from the P-SCH transmitted from multiple cells differ from each other, and thus, the above problem may not occur.

In order for the system with inter-station synchronization to avoid deterioration of the characteristics of the S-SCH, mentioned above, is considered a way to search cell, according to which two or more sequences of P-SCH, for example, three or seven sequences of the P-SCH. See, for example, document R1-062636 "Cell Search Performance in Tightly Synchronized Network for E-UTRA". Alternatively, in order in the system with inter-station synchronization to avoid deterioration of the characteristics of the S-SCH, was proposed several ways to transmit the P-SCH for sites in different intervals of the transmission. See, for example, document R1-070428 "Further analysis of initial cell search for Approach 1 and 2 - single cell scenario". In accordance with this method, the P-SCH with different moments of reception of several hundred can be used for demodulation and decoding of the S-SCH, allowing you predated the th above-mentioned deterioration of the characteristics of the S-SCH.

At the same time, taking into account the honeycomb structure, it is desirable to use a larger number of sequences of P-SCH, as proposed in document R1-062636 or more species of intervals transmit the P-SCH, as proposed in document R1-070428. If you are using a small number of sequences of P-SCH or a small number of types of transmission intervals of the P-SCH, it increases the likelihood that the sequence of P-SCH or the intervals of transmission of P-SCH will be the same in adjacent cells, which, in turn, can be likely to lead to deterioration of the characteristics of the S-SCH in the system with inter-station synchronization.

In addition, the above period of time required for cell search, i.e. transmission characteristics when searching for a cell and load for mobile stations for data processing at the cell search should be determined as a result of compromise. Thus, using settings or hardware, you can choose what is more important - transmission characteristics or load to mobile stations for data processing at the cell search.

Above the level of technology inherent in the following disadvantages.

As mentioned above, the sync channel (SCH, synchronization channel) performs alarm function in the downlink to search for honeycomb. It was decided that the La channel hierarchical synchronization channel SCH. See, for example, the document 3GPP TS 36.211 V1.0.0 (2007-03). More precisely, the channel synchronization consists of two sub - primary sync channel (P-SCH primary synchronization channel and the secondary sync channel (S-SCH, secondary synchronization channel).

In the secondary sync channel transmitted such individual for cell information, as groups of cells IDs, the timing of radicata and the number of transmitting antennas. The user terminal detects individual cell information by detecting sequences of the secondary synchronization channel.

As described above, in the scheme of W-CDMA (Wideband Code Division Multiple Access, wideband multiple access, code-division multiplexing) in the process of switching communication (handover, handover) searches related SOT, but for individual cell information about neighboring cells (neighboring cell) is transmitted to the user terminal before performing the search for neighboring cells. If in the process of searching adjacent cells, which are detected target cell of handover during communication or in standby mode, information about the neighboring cell is transmitted in advance, the potential for individual cell information which is subject to detection, can be reduced. However, in the LTE system at the present time, we cannot conclude that the information about the adjacent cell is transmitted.

As one of the renderers for sequences of the secondary sync channel was proposed method show different sequences relative frequency direction. See, for example, documents 3GPP R1-060042 "SCH Structure and Cell Search Method in E-UTRA Downlink and 3GPP R1-071584 "Secondary Synchronization Signal Design". For example, subcarriers orthogonal sequence 1 (P1(0), P1(1), ..., P1(31)) and the orthogonal sequence 2 (P2(0), R2(1), ..., R2(31)) can be displayed alternately, one after the other, as shown in figure 1. In addition, for example, orthogonal sequence 1 (P1(0), P1(1), ..., P1(31)) and the orthogonal sequence 2 (P2(0), R2(1), ..., P2(31)) can be displayed in sequential subcarriers, as shown in figure 2. Thus, if there are several separate sequences can be transferred more templates. More precisely, if, for example, uses a sequence of the same type with a sequence length equal to 64, then can be passed to templates 64 types. On the other hand, if, as shown in figure 2, uses a sequence of two types with the sequence length is equal to 32, it can be passed to templates 1024 types.

The decision was made to use a few pic is of egovernance channel synchronization for example, sequences Sadova - Chu (Zadoff - Chu) of the three types, P-SCH, and the use of S-SCH binary sequences, and the fact that sequences are combinations of short codes are of two types. See, for example, the document 3GPP TS 36.211 V1.0.0 (2007-03) and 3GPP R1-071794.

Obviously, when using sequences of the S-SCH, there is a risk of increasing the value of the PAPR (Peak-to-Average Power Ratio, the ratio of the peak and average power), especially in the system of 1.25 MHz.

In addition, the P-SCH and S-SCH are transmitted in one potcake duration of 1 MS, and podcat containing P-SCH and S-SCH, repeated every 5 MS. In other words, the sync channel is transmitted every 5 MS. The terminal user define values for channel estimation in resident sectors (the sectors where they are by taking different P-SCH for some sectors, perform compensation of the channel for different S-SCH in separate cells based on the values of channel estimation and demodulator S-SCH search for honeycomb. In this case, the terms "cell" and "sector" are used interchangeably, without contradicting each other, but the "honeycomb" if necessary, may contain several "sectors". In the system with inter-station synchronization, which synchronizes the signals from different cells, the mobile station receives signals simultaneously from several hundred. The user located near the boundary of the sectors, belonging to one base station may determine the sector by taking different P-SCH to separate cells. However, since the S-SCH of the separate cells are common, S-SCH would be accepted in the form of a composite signal from both sectors. To perform compensation channels for S-SCH based on only the values of channel estimation in resident sectors is difficult. For this reason, the probability of detection signals S-SCH may be reduced. In the case of transfer of the same S-SCH from each cell every 5 MS may experience interference every 5 MS, which can lead to a decrease in the probability of detecting S-SCH in the mobile station.

Disclosure of inventions

Thus, one of the purposes of the present invention is to increase the probability of detecting S-SCH in the search cell.

In accordance with one aspect of the present invention uses a base station used in a mobile communication system, comprising several hundred, consisting of several sectors. The base station includes a generation module channel synchronization is made with the possibility of generation of the sync channel to use for cell search by a user terminal; and a transmission module, configured to wirelessly transmit the signal including the sync channel. The sync channel includes a primary Cana the synchronization and the secondary sync channel. The primary sync channel sequence includes several types, and the secondary sync channel transmitted in the sector cell, includes a code defined by a predetermined generating polynomial equation corresponding to the primary sync channel.

In accordance with the implementation of the present invention can increase the probability of detecting S-SCH in the search cell.

Brief description of drawings

1 schematically illustrates a display method for sequences S-SCH.

Figure 2 schematically illustrates another display method for sequences S-SCH.

Figure 3 presents a block diagram illustrating the structure of a radio communication system in accordance with one embodiments of the present invention.

Figure 4 schematically illustrates the structure of radicata.

Figure 5 schematically illustrates the structure podagra.

Figure 6 presents a partial block diagram illustrating a base station in accordance with one embodiments of the present invention.

7 shows a block diagram illustrating a signal processor main frequency band to the base station in accordance with one embodiments of the present invention.

On Fig schematically shows an example of determining the Sha is the source of transmission of the synchronization signal.

On figa shows an example of the method for determining the sequence of the S-SCH.

On FIGU shows another example of the method for determining the sequence of the S-SCH.

Figure 10 shows another example of the method for determining the sequence of the S-SCH.

Figure 11 presents a partial block diagram illustrating a mobile station in accordance with one embodiments of the present invention.

On Fig is a diagram illustrating a method of cell search in accordance with one embodiments of the present invention.

On Fig schematically illustrates a method of generating scrambling code in the primary broadcast channel.

On Fig illustrates a method of transferring SCH.

On Fig illustrated version of the module generation of the sync channel.

The LIST of SIGNS:

50k(501, 502, 503): honeycomb.

100n(1001, 1002, 1003, 1004, 1005): mobile station.

102: correlation module base signal.

104: module generating copies of the synchronization signal.

106: module multiplication code sequence.

108: the correlation engine code top level.

110: module detection time parameters.

112: module detecting S-SCH.

200m(2001, 2002 , 2003): the base station.

202: transceiver antenna.

204: the amplification module.

206: the transmission module and reception.

208: module signal processing baseband frequency.

209: the generation of the synchronization signal.

210: module call.

212: channel interface.

2081: processing extension RLC.

2082: processing extension MAC.

2083: the encryption module.

2084: data modulation module.

2085: multiplexing module.

2086: module serial-to-parallel conversion.

2087: multiplier.

2088: multiplier.

2089: module code generation scrambling.

20810: module amplitude adjustment.

20811: module combination.

20812: the modulus of the inverse Fourier transform.

20813: module add a CP (cyclic prefix).

2091: control module synchronization signal.

2092: module signal synchronization.

2093: data modulation module.

2094: module serial-to-parallel conversion.

2095: multiplier.

2096: module amplitude adjustment.

252: generation module P-SCH.

254: generation module S-SCH.

256: multiplier.

258: the module for generating the scrambling sequence.

260: module multiple the financing.

300: access gateway.

400: core network.

1000: radio system.

The implementation of the invention

Below with reference to the accompanying drawings are described in detail embodiments of the present invention. In all the accompanying drawings to designate components that perform the same functions, are identical symbols, and the description of such components is not repeated.

The first variant embodiment of the invention

Below with reference to figure 3 in accordance with the first embodiment of the present invention describes a communication system containing a mobile station and a base station.

The radio communication system 1000 may be implemented, for example, in accordance with the technology Evolved UTRA and UTRAN (also referred to as Long Term Evolution or Super 3G). The radio communication system 1000 includes a base station (eNB, eNode B) 200m(2001, 2002, 2003, ..., 200mwhere m is a positive whole number) and the mobile station 100n(1001, 1002, 1003, ..., 100nwhere n is a positive integer)that communicates with the base stations 200m. The base station 200 is connected to the station on the upper level, such as the gateway 300 access, which is connected with a core network 400. The mobile station 100ncommunicate with base stations 200min any of the hundred 50k(50 1, 502, ..., 50kwhere k is a positive integer) in accordance with the technology Evolved UTRA and UTRAN. In this embodiment of the present invention, the number of mobile stations 100nestablish communication channels with the base stations 200mand can communicate with the base stations 200m, while other mobile stations do not establish a communication channel with any of the base stations can not communicate with the base stations 200m.

The base station 200mtransmits the synchronization signals. Mobile station 100nlocated in one of the hundred 50k(501, 502, ..., 50kwhere k is a positive integer), and when it is switched on or during the period of intermittent reception in the communication process executes a signal-based synchronization, cell search for detecting cell, which can serve a given mobile station 100nwith the best communication quality. In other words, the mobile station 100nuses the synchronization signals with the aim of detecting temporal parameters for symbols and frames, as well as for individual cell information such as cell ID) based positioning (for individual cell scrambling codes defined cell ID) based positioning or set of cells IDs (hereinafter called the group of cells IDs).

In this embodiment, is sushestvennee of the present invention, the cell search is performed in the time when the mobile station 100ncommunicates and during the time when the mobile station 100nthere is no connection. For example, the search cell for the mobile station 100nengaged in the present communication, can be performed to detect the honeycomb with the same frequency or hundreds of other frequencies. In addition, the search cell for the mobile station 100nnot exercising at the moment, the connection may be performed, for example, when it is switched on or in standby mode.

The base station 200m(2001, 2002, 2003, ..., 200m) identically constructed, perform the same functions and are in the same state, therefore, unless specifically stated otherwise, the following describes the base station 200m. In addition, the mobile station 100n(1001, 1002, 1003, ..., 100n) identically constructed, perform the same functions and are in the same state, therefore, unless specifically stated otherwise, the following describes a mobile station 100n. In addition, cell 50k(501, 502, 502, ..., 50k) have the same structure, perform the same functions and are in the same state, therefore, unless specifically stated otherwise, the following describes the honeycomb 50k.

The radio communication system 1000 uses the radio access scheme of OFDM and SC-FDMA, according to the respectively, in the descending and ascending lines. As mentioned above, in the OFDM frequency band is divided into multiple narrow frequency bands (subcarriers)and data is being transmitted on these individual subcarriers. On the other hand, in the scheme of SC-FDMA frequency band is divided into several frequency bands, with different frequency bands are assigned to individual terminals for transmission to reduce interference between terminals.

The following describes the communication channels established in accordance with the technology Evolved UTRA and UTRAN.

In downward communication lines are subject to the General physical downlink channel (PDSCH, physical downlink shared channel), which is shared by the mobile stations 100nand the downward control channel for LTE. In downward communication lines some information items, such as mobile station shown in PDSCH corresponding transport format, the mobile station shown in the PUSCH, the appropriate transport format and confirm PUSCH transmitted in the downlink of the LTE control and user data are transmitted in the PDSCH.

In addition, the base station 200min downward communication line transmits the synchronization signal to the mobile station 100nin order to perform the cell search.

In the ascending line of communication using the shared physical uplink channel (PUSCH, Physica Uplink Shared Channel), which is shared by the mobile stations 100nand the upward control channel for LTE. The upward control channel may contain channels of two types: channel, multiplexity in time with the PUSCH, and the channel multiplexity with PUSCH frequency.

In the ascending lines, some items of information, such as information about quality in downlink (CQI, Channel Quality Indicator, a quality indicator channel)is used for scheduling PDSCH, and AMC (Adaptive Modulation and Coding, adaptive modulation and coding), as well as confirmation for PDSCH (HARQ ASC), are transmitted in the uplink control channel for LTE. In addition, in the PUSCH is transmitted user data.

As shown in figure 4, when transmitting data in the downlink duration of one radicata is 10 MS, and this radiocat contains ten podkatov. In addition, as shown in figure 5, one podcat consists of two time slots (slots), each of which contains seven OFDM symbols to short CF (upper part of figure 5) and six characters long SR (lower part of figure 5).

BASE STATION ENB

Next, with reference to Fig.6 describes the base station 200min accordance with one embodiments of the present invention.

In accordance with this embodiment of the present invention the base stance contains a receive / transmit antenna 202, module 204 gain module 206 transmission and reception module 208 of the signal processing base band frequency module 210 call processing and channel interface 212.

Packet data transmitted in downlink communication from the base station 200min the mobile station 100n, and served from station upper level with respect to the base station 200, for example from the gateway 300 access module 208 signal processing baseband frequencies through the channel interface 212.

In module 208 signal processing baseband frequencies is performed segmentation and concatenation of packet data transfer operation at the level of the RLC (Radio Link Control control line radio communication)such as the management of re-transmission for the RLC operation control re-transmission at the MAC layer (Medium Access Control control access to the transmission medium), such as the transmission of HARQ (Hybrid Automatic Repeat request, hybrid automatic request retransmission), the planning, the selection of the transport format, channel coding and inverse fast Fourier transform (IFFT, Inverse Fast Fourier Transform), and the received data is directed to the module 206 transmission and reception. In addition, as described below, the module 208 signal processing baseband frequencies is performed in the generation of synchronization signals. The synchronization signals are multiplexed in a packet data and sent to the module 206 p is passing and receiving.

The module 206 transmission and reception performs frequency conversion to convert the signals to baseband frequencies coming from module 208 signal processing baseband frequencies in the RF signals. Then the received signals are amplified in module 204 gain and transmitted through the transmit-receive antenna 202. In this case, as mentioned above, under the main signal bandwidth refers to packet data and/or synchronization signals.

On the other hand, in regard to the data transmitted in uplink communication from the mobile station 100nin the base station 200m, RF signals received transmit-receive antenna 202, amplified by module 204 strengthen and pass in the module 206 of the transmission and reception frequency converting signals in baseband frequencies, which are served in module 208 signal processing baseband frequency.

Module 208 signal processing main band performs fast Fourier transform (FFT, fast Fourier transform), decoding with error correction, the receive operation to control the re-transmission at the MAC level and the receive operation at the level of the RLC incoming signals to baseband frequency, and then transmits the resultant signals to the gateway 300 access through a channel interface 212.

Module 210 call manages the state of the base station 200, and performs the allocation of the resources.

Next, with reference to Fig.7 describes a sample module structure 208 signal processing baseband frequencies. Because embodiments of the present invention mainly relate to top-down communication lines, figure 7 shows the components associated with operations in the downlink, and not showing the components associated with operations in the ascending line.

Module 208 signal processing baseband frequencies contains module 2081the RLC processing module 2082the MAC processing module 2083encoding module 2084data modulation module 2085the multiplexing module 2086serial-to-parallel conversion, the multipliers 2087, 2088module 2089the scrambling code generation module 20810amplitude adjustment module 20811combining module 20812IFFT (IDFT)module 20813add CF and module 209 generation of the synchronization signal.

Module 2081processing the RLC performs transmission of the RLC level, such as segmentation and concatenation, and operations management re-transmission of RLC level for the transmitted data sequences downstream packet data received from the channel interface. Then the received sequence of data encoded by module 2083encode and modulate module 208 4data modulation. Module 2085multiplexing multiplexes pilot symbols in the modulated sequence of data, which are series-parallel conversion module 2086serial-to-parallel conversion for the generation of N information symbol sequences, aligned on the frequency axis. These pilot symbols can represent, for example, the control signals downlink (DL-RS; downlink reference signal). For N information symbol sequences, aligned on the frequency axis, scrambling codes generated by module 2089the scrambling code generation, are multiplied in the frequency direction in the respective N multipliers 2087. Then the sequence of symbols multiplied by the scrambling code, multiplied by N multipliers 2088on the sequence values of the amplitude adjustment coming from module 20810amplitude adjustment, and the resulting character sequence fed to the input module 20811combining them. Module 20811combining multiplexes the synchronization signals generated by the module 209 generating the synchronization signal, in the character sequence of length N, are multiplied by the scrambling codes and the values of the sequence settings the s amplitude, in the respective subcarriers of the N subcarriers.

As described below, the module 2091control synchronization signal determines the number podkatov and the numbers of time slots for transmission of synchronization signals. In podkraj and time intervals for transmission of synchronization signals with defined so the rooms module 20811combining combines the synchronization signals generated by the module 209 signal generation synchronization with other signals (character sequences obtained by multiplying the packet data downlink scrambling codes and the sequence of amplitude adjustment). In podkraj and time intervals with corresponding numbers in which the synchronization signals are not transmitted, the synchronization signals generated by the module 209 generation of the clock signal is not multiplexed. In this case, the module 20812the inverse Fourier transform serves only character sequences with length N obtained by multiplying the packet data downlink scrambling codes and the sequence of amplitude adjustment. Subcarriers multiplexed with the synchronization signal may, for example, be in the frequency band containing the Central h the frequency of the entire bandwidth of the system. In addition, the bandwidth for subcarriers multiplexed synchronization signal may be, for example, is set equal to 1.25 MHz.

Module 20812the inverse fast Fourier transform (IFFT, inverse Fourier transform) transforms the N symbols in orthogonal multi-carrier signal. Module 20813add CF CF adds in a multi-carrier signal for each time period of the Fourier transform. Depending on the length there are two types of CF - long CP and short CF. For each of the hundred selected one of the specified types CF.

The following describes the operation of generating synchronization signals in a module 209 generation of the synchronization signal. The synchronization signal consists of the first synchronization signal (hereinafter referred to as the primary sync channel or P-SCH) and secondary synchronization signal (hereinafter called a secondary sync channel or S-SCH). Module 209 generating the synchronization signal contains a module 2091control signal synchronization module 2092signal synchronization module 2093data modulation module 2094serial-to-parallel conversion, the multiplier 2095and module 2096amplitude adjustment. Module 2092signal synchronization module contains 252 generating P-SCH, the module 254 generation S-SCH, multiply the l 256, module 258 generate a sequence of scrambling and multiplexing module 260. Module 2091control synchronization signal associated with a module 252 generating P-SCH, the module 254 generation S-SCH, module 258 generate a sequence of scrambling and multiplexing module 260 in module 2092signal synchronization.

Module 2091control synchronization signal determines the number of sequences for P-SCH and S-SCH, and numbers podkatov and the numbers of time intervals for transmitting the P-SCH and S-SCH based on the ID of the cell or group of cells IDs for one or more cells, in which the base station 200mprovides communication in accordance with the technology Evolved UTRA and UTRAN. For example, after identifying a group of cells IDs of the mobile station can determine the honeycomb, for example, on the basis of pilot signals, i.e. patterns of the reference signals. In this case, for example, suggested that the pattern of the reference signal and the identifier of the cell were specified in advance. Alternatively, the mobile station can identify the honeycomb, for example, the modulation and decoding the P-SCH and S-SCH. In this case, for example, it is proposed that the sequence number of P-SCH and the cell identity have been set in advance. For example, for the P-SCH can be selected by choosing the e sequence for individual sectors. For example, the P-SCH for cells containing three sectors can be selected from a set including three different sequence.

Then the module 2091control sync signal transmits the sequence number of P-SCH in module 252 generating the P-SCH and transmits the sequence number S-SCH in the module 254 generation S-SCH. In addition, the module 2091control synchronization signal transmitting module 260 multiplexing room podagra number and time interval for transmitting the P-SCH and S-SCH as information about the timing of the transmission of the synchronization signal.

For example, as disclosed in document 3GPP TS 36.211 V1.0.0 (2007-03) and shown in Fig, the radio communication system 1000 can determine the number podagra number and time interval for transmitting the P-SCH and S-SCH. In this example, for the transmission of synchronization signals in podkraj with numbers #1 and #6 are sequence P-SCH several types, such as three types. In addition, as in this example, the P-SCH is displayed in the last OFDM symbol in the time interval, the mobile station can demodulate the P-SCH regardless of what CF is used - long or short. The reason for this is that as a last OFDM symbol sixth OFDM symbol in the case of long CF time corresponding to the seventh OFDM symbol in the case of short CF. In other words, the upper and lower boundary of the time intervals correspond to each other in any form: as when using short WED, and when using long CF. At this time, the radio communication system 1000 can pre-match sequence number P-SCH with information about the cell ID) based positioning. This mapping is set in the radio communication system 1000, which allows the module 2091control sync signal in the corresponding base station 200mto determine the sequence number of P-SCH based on the cell ID in which the base station 200mprovides communication in accordance with the technology Evolved UTRA and UTRAN.

Typically, the communication area provided by the base station 200msplits into two or more zones. This process is called sectorization. If the base station 200mserving multiple sectors, the above mentioned ID cell or group of cells IDs can be used in a zone ID, collectively assigned to all sectors of the base station 200mor the identity of the individual sectors of the base station 200m. If the cell identity, collectively assigned to all sectors of the base station 200mused as a cell ID or a group of cells IDs, the combination of the above sequence, signal synchronization and non podagra corresponding to the number of time slot for transmission si the synchronization signals are set for each base station 200 m. If the ID of the cell or group of cells IDs are the IDs of the individual sectors of the base station 200mthen the combination of the above sequence, signal synchronization and non podagra and non time interval for transmission of synchronization signals are set for each sector of the base station 200m.

For the sequence P-SCH can be used in sequence CAZAC (Constant Amplitude Zero Autocorrelation, code constant amplitude zero autocorrelation), such as the sequence Sadova - Chu disclosed in document .Chu, "Polyphase codes with good periodic correlation properties" (IEEE Trans. Inform. Theory, vol.11-18, pp.531-532, July 1972), the sequence of Frank (Frank)disclosed in document R.L.Frank, S.A.Zadoff, "Phase shift pulse codes with good periodic correlation properties" (IRE Trans. Inform. Theory, vol. IT-8, pp.381-382, July 1962), the modulated sequence franc disclosed in document R.L.Frank, S.A.Zadoff, "Phase shift pulse codes with good periodic correlation properties" (IRE Trans. Inform. Theory, vol. IT-8, pp.381-382, 1962), the complementary sequence of the cell (Golay)disclosed in document .J.. Golay, "Complementary Series" (IRE Trans. Inform. Theory, vol.7, pp.82-87, April 1961), double repeated complementary sequence of the cell disclosed in document 3GPP, R1-062487 "Hierarchical SCH signals suitable for both (FDD and TDD) modes of E-UTRA", the sequence PN (Pseudo Noise, pseudosolenia sequence) and/or other sequence.

Cu is IU, as the sequence S-SCH may be used duplex sequence S-SCH obtained by multiplying the non-orthogonal or orthogonal sequence scrambling to orthogonal or non-orthogonal sequence, as is disclosed in the document 3GPP, R1-070146 "S-SCH Sequence Design". In addition, this may be a sequence of S-SCH, the resulting alternating locations in the frequency domain multiple orthogonal sequences and orthogonal sequences. In addition, this may be a sequence of S-SCH, obtained by multiplying the non-orthogonal or orthogonal scrambling sequences into multiple orthogonal or non-orthogonal sequences, as disclosed in document 3GPP R1-060042 "SCH Structure and Cell Search Method in E-UTRA Downlink". In addition, this may be a sequence of S-SCH, the resulting location of the multiple orthogonal sequences or non-orthogonal sequences of consecutive subcarriers, as disclosed in document 3GPP R1-071584 "Secondary Synchronization Signal Design". In addition, this may be a sequence of S-SCH, the resulting host multiple orthogonal or non-orthogonal sequences in the serial the subcarriers and their multiplication on non-orthogonal or orthogonal sequence scrambling. As orthogonal sequences can be used the sequence of Walsh - Hadamard (Walsh - Hadamard), orthogonal sequence with phase rotation (phase rotation orthogonal sequence) and/or orthogonal M-sequence. As a non-orthogonal sequences can be used CAZAC sequence, such as a GCL sequence, the sequence of the cell, the complementary sequence of the cell disclosed in document M.J.E. Golay, "Complementary Series" (IRE Trans. Inform. Theory, vol.7, pp.82-87, April 1961), an M-sequence disclosed in document 3GPP, R1-072093 Details on SSC Sequence Design", pseudosolenia sequence and/or other sequence.

Module 252 generating the P-SCH and the module 254 generation S-SCH generating, respectively, the sequence of P-SCH and the sequence S-SCH based on the sequence information of the synchronization signal and information about the timing of the transmission of the synchronization signal transmitted by the module 2091control sync signal.

For example, module 2092signal synchronization can be divided into levels for individual cell information transmitted in the S-SCH for generation of the S-SCH. Individual cell information includes at least one of the following informational elements: group of cells IDs, timings happy is Okaka and the number of transmitting antennas. In this embodiment of the present invention, the radio communication system 1000 can transmit the fragment divided into levels of information as prior information when searching for a cell mobile stations. For example, as preliminary information can be transmitted to the group of cells IDs. In addition, it may be part of a group of cells IDs. Can also send information about the timing of radicata. In addition, you may transfer the number of transmitting antennas. In addition, prior information can be included in any information element that is included in the combination, consisting of a group of cells IDs, group IDs hundred, temporal parameters of radicata and the number of transmitting antennas. Thus, mobile stations at the cell search is required to detect a smaller number of sequences.

More precisely, as shown in figa, group of cells IDs can be divided into a sequence of several types, such as sequences of two types, each of which includes a short code sequence length equal to 31. In this drawing, the first short code on the vertical axis represents the index of the sequence of the first short code in the sequence S-SCH, for example, in the case of a short to the s of two types, the length of the sequence of each of which is 31. In this drawing, the second short code on the horizontal axis represents the index of the sequence, the second short code. As for the first and second short code provides 31 index sequence, however, as noted above, if necessary, the number of indices in the sequence, assigned to the first and second short code, may be limited.

As shown in the drawing, the index sequence for the first short code for use in set #1 timing (frame) is selected from a first range of numeric values (0-13). The index sequence for the second short code for use in set #1 temporal parameters is selected from a second range of numeric values (23-30). The index sequence of the first short code for use in set #2 time parameters, which is 5 MS later set #1 time is selected from a second range of numeric values (23-30). The index sequence for the second short code for use in set #2 time parameters is selected from a first range of numeric values (0-13).

Thus, if the ranges of numerical values of the indices of the sequence for use in the first and second set of temporary parameter does not overlap, it is possible to reduce the possible options codes to search for the respective first and second codes that allows you to quickly search. In addition, when the detection of the index sequence can quickly establish whether the index sequence for the first short code set #1 temporal parameters.

On FIGU schematically illustrates another method for determining the sequence of the S-SCH. As shown in the drawing, the index sequence for the first and second short codes are selected from the same range of numerical values (0-30). For convenience, the index sequence for the first and second short codes are denoted as m and n. In the drawing, for example, a pair of parameters m and n is determined so that the inequality m-n≤Δ or n-m≤Δ. The parameters m and n represent integers in the range from 0 to 30, and the parameter Δ is an integer less than or equal to 29. Compared with the example shown in figa, indexes, sequences are selected from a relatively wide range of numerical values, and, thus, different codes can more degree of freedom combined for the secondary sync channel, which is more preferable from the viewpoint of prevention of conflicts (collisions).

Figure 10 schematically illustrates one is th way to determine the sequence of the S-SCH. In this example, the index sequence for the first and second short codes are also selected from the same range of numerical values (0-30). On the other hand, unlike the examples shown in figa and 9B, in the example in figure 10 there is no simple pattern, and a different pair of first and second codes are selected so that could not form the same combination.

The sequence of P-SCH generated by module 252 generating the P-SCH, served in the multiplexing module 260, and the sequence S-SCH generated by module 254 generation S-SCH, served in the multiplier 256. Module 2091control synchronization signal transmitting module 258 generating the scrambling sequence information indicating the sequence of scrambling. For example, module 2091control sync signal may pass in a module 258 generate a sequence of scrambling information indicating a single scrambling code for all cells. Module 258 generating the scrambling sequence to generate the scrambling sequence based on the information indicating the sequence of scrambling, which is transferred from the module 2091control sync signal, and sends this sequence to the multiplier 256. In the multiplier 256 follower of the awn scrambling is multiplied by the S-SCH, and multiplied sequence S-SCH is transmitted in a multiplexing module 260. In regard to the length of the scrambling sequence, the scrambling process (spread spectrum) can be carried out using short codes are of two types, while for each of the short codes of the two types may be scrambling. Codes scrambling of several types can be used for transmission in the sequence S-SCH some system information, such as the timing of the frame, the group of cells IDs and the number of transmitting antennas. Thus, it is possible to reduce the PAPR value for the sequence S-SCH, in particular, in the system of 1.25 MHz.

However, in the case where adjacent cells and/or cell of one base station use the same sequence of S-SCH, the interference from adjacent honeycomb can lead to a decrease in the probability of detecting S-SCH in the user terminal. For this reason more time is needed to search cell, which leads to deterioration of the temporal characteristics when searching for a cell. To solve this problem by randomization of interference from adjacent honeycomb module 2091control sync signal is preferably transmitted to the module 258 generate a sequence of scrambling information indicating various PEFC is the scrambling sequences for various hundred within the scrambling codes of several types. In this case, the scrambling codes of several types can be used as scrambling codes S-SCH for different cells. Alternatively, for different base stations may use different scrambling codes. In this case, the module 258 generating the scrambling sequence can generate the scrambling sequence based on the information indicating the scrambling code received from the module 2091control sync signal, and transmitting it to the multiplier 256. The generated scrambling sequence may represent a unique scrambling sequence for the sequence of the P-SCH, associated with the sequence number P-SCH. In addition, as disclosed in document 3GPP, R1-072661 "Scrambling Method for Two S-SCH Short Code"that can generate a scrambling sequence that is specific for the sequence number short codes one or two types. In the multiplier 256, the scrambling sequence received from a module 258 generating the scrambling sequence is multiplied by a sequence of S-SCH, and the resulting sequence is supplied to the multiplexing module 260. In regard to the length of the scrambling sequence, the scrambling process can be carried out for short code is in two types of whole or for each of the short codes are of two types. For example, multiplied the scrambling sequence may be a sequence of scrambling, private for all cells, the scrambling sequence, specific for the sequence P-SCH sequence scrambling of several types and/or a scrambling sequence that is specific for the sequence number short code one of two types. In an alternative embodiment, the scrambling sequence, uniformly used in all cells, may be multiplied by a short code is one of two types, while the scrambling sequence, specific for the sequence of the P-SCH may be multiplied by another short code. In another embodiment, the scrambling sequence, specific for the sequence of the P-SCH is multiplied by a short code is one of two types, while the scrambling sequence, specific for the sequence number of the other short code can be multiplied by another short code. Sequence scrambling of several types can be used for transmission in the sequence S-SCH some system information, such as the timing of the frame, the group of cells IDs and the number of transmitting antennas. Module 260 multiplexing multiple ciruit sequence P-SCH sequence S-SCH, multiplied by the scrambling sequence, and transmits the received sequence in module 2093modulation data.

The sequence of the synchronization signal generated by module 2092signal synchronization is modulated module 2093modulation data and passes the serial-to-parallel conversion in NSCHcharacter sequences on the frequency axis in module 2094serial-to-parallel conversion. The multiplier 2095multiplies NSCHcharacter sequences to the sequence value of the amplitude adjustment coming from a module 2096amplitude adjustment, and transmits the received sequence in module 20811combination.

The USER TERMINAL (UE)

Next, with reference to 11 describes the mobile station 100 in accordance with the embodiment of the present invention.

Mobile station 100 contains the module 102 correlation of the underlying signal, the module 104 generate copies of the signal synchronization module 106 multiplication code sequence, the module 108 correlation code top-level module 110 detection time parameters and module 112 detecting the S-SCH.

The mobile station 100 transmits signals on multiple frequencies received by the antenna module 102 correlation of the underlying si is Nala. On the other hand, the module 104 generate copies of the synchronization signal generates predefined copies of the synchronization signal of the base signal and sequentially sends them to the module 102 correlation of the underlying signal. The module 102 correlation of the underlying signal detects the correlation between the received signals on multi-carrier and copies of the synchronization signal of the base signal. Module 106 multiplication code sequence multiplies (or produces the inversion of the code) the code sequence to the base signal from the output of the module 102 correlation of the underlying signal. The module 108 correlation code top level detects the correlation between the received output module 106 multiplication code sequence, and code top level. Thus can be correlated with a copy of the P-SCH.

The module 110 detection timing detects the timing of the P-SCH and the sequence number of P-SCH based on the correlation values. After detecting the sequence number of P-SCH is diskriminirovaniya sequence S-SCH, multiplied by the scrambling sequence. On the basis of the detected temporal parameters of the P-SCH module 112 detecting S-SCH detects the S-SCH by using the P-SCH as a reference signal. For example, if previtellogenic passed a group of cells IDs, the detected timings of radicata and the number of transmitting antennas. If the scrambling is performed in the base station, diskriminirovaniya should be performed after detecting the synchronization.

The following is a specific implementation of the present invention.

The cell search is performed based on the P-SCH and S-SCH signals in downlink. As mentioned above, the cell search is performed on the basis of sequences of P-SCH and S-SCH, defined in the radio communication system 1000. In other words, the cell identity and group identity hundred is detected by detecting the sequence of P-SCH and the sequence S-SCH. After the detected cell ID) based positioning, using a scrambling code associated with the cell ID, is received broadcast information, such as a primary broadcast channel (primary broadcast channel), and the cell search process is terminated. Sequence characteristics P-SCH and the transfer pattern of the synchronization signal defined in the radio communication system 1000, are compatible with the characteristics given in the description of the base station 200mso the description of these features is omitted.

For example, if the radio communication system 1000 determines the pattern of transmission of the synchronization signal shown in Fig, and C is a sequence of P-SCH is associated with information about the cell ID) based positioning in advance the module 110 detection time parameters can be used to detect the timing of the sync channel and the sequence number of P-SCH. In addition, the module 112 detecting the S-SCH can diskriminirovaniya, for example, based on the scrambling sequence multiplied by a sequence of S-SCH, and to detect individual cell information by detecting information elements in the S-SCH.

The TRANSMISSION AND RECEPTION of the SYNC CHANNEL

The following describes a method of transmitting channel synchronization in accordance with this embodiment of the present invention.

Module 254 generation S-SCH selects multiple sequences of the synchronization signal. For example, in each of the sets #1 and #2 temporal parameters of radicata selected sequence of two types, i.e. a sequence with a sequence length equal to 32, which contains 16 short codes (indicator #1 group of cells IDs of the first level), and a sequence with a sequence length equal to 32, which contains 16 short codes (indicator #2 group of cells IDs of the second level). Then the module 254 generation S-SCH generates preliminary information that should be transmitted to the mobile station. For example, can be generated preliminary information indicating the group of the IDA is tification hundred first level, which is part of the information for identifying a group of cells IDs. Is then passed to the generated preliminary information.

In addition, the module 254 generation S-SCH generates a secondary sync channel on the basis of several selected sequences of the synchronization signal. For example, the module 254 generation S-SCH generates a secondary sync channel indicating group IDs hundred first level, which is part of the information to define a group of cells IDs and group IDs hundred second level, which is part of the information to define a group of cells IDs. Module 2091control synchronization signal transmitting module 258 generating the scrambling sequence information indicating the sequence of scrambling. For example, module 2091control synchronization signal transmitting module 258 generate a sequence of scrambling information indicating the code scrambling, uniformly used by all cells. In addition, the module 2091control sync signal may, for example, to pass in module 258 generate a sequence of scrambling information indicating scrambling codes in several types. The secondary sync channel is served on whodunnits 256, for transmission multiplies the secondary sync channel on the scrambling sequence generated by the module 258 generating the scrambling sequence.

The mobile station detects individual cell information in the preliminary information and the secondary sync channel.

Next, with reference to Fig describes a method of cell search in the radio communication system 1000 according to the embodiment of the present invention.

The first steps of mobile station detects the correlation between the sequence of the primary sync channel and the received signal, and detects the carrier frequency and temporal parameters for the primary sync channel (steps S1102 and S1104). In step S1106 is detected, the sequence number of the primary sync channel. When performing the first steps of the mobile station can determine the phase difference signal and to perform compensation of the frequency offset.

If it is determined timing, the carrier frequency and the sequence number of the primary channel synchronization can be defined timing and the carrier frequency of the secondary sync channel. Diskriminirovaniya is performed for the secondary sync channel, multiplied by the scrambling sequence.

Then, in step S1108, based on the selected authentication sequence specific for cells of the secondary sync channel detected timings of the frame for use in the secondary sync channel. Usually one frame is assigned to multiple channels synchronization, for example, two channel synchronization, so the timing of the frame must be detected after detecting the temporal parameters of the channel. In addition, in step S1110 is detected group of cells IDs on the basis of sequence specific for cells of the secondary sync channel.

For example, if the mobile station is transmitted in advance of the group of cells IDs or the entire group of cells IDs, it is possible to reduce the amount of possible individual information which is subject to detection, which improves the accuracy of detection. The result can be improved characteristics. As preliminary information can be transmitted, for example, the timing of radicata or the number of transmitting antennas.

In the case that the base station multiple transmit antennas, the base station may transmit to the mobile station, the number of transmitting antennas in the secondary sync channel, the mobile station can detect the number of transmit antennas (information about the antennas in the MIMO system (Multiple Input Multiple Output system with many inputs and many outputs)at step S1112. In particular, the mobile station can detect the number of transmit antennas used to convey extensively what estelrich channels.

Next, in step S1114 is detected cell ID) based positioning using a group of cells IDs, detektirovanii in the second step, the sequence number of the primary sync channel, detektirovanie in the first step.

The second option of carrying out the invention

The following describes a communication system containing a mobile station and a base station in accordance with another embodiment of the present invention. Radio system, base station and mobile station in accordance with this embodiment of the present invention have the structure described with reference to Fig 3, 6, 7, and 11.

In the base station 200 in accordance with an implementation of the present invention, the module 2091control signal based synchronization sequence number P-SCH transmitting module 258 generating the scrambling sequence information indicating the sequence of scrambling, individual sequences for the P-SCH. In this case, the module 258 generating the scrambling sequence to generate the scrambling sequence based on the information indicating the sequence of scrambling is coming from a module 2091control sync signal, and transmits it to the multiplier 256. In the multiplier 256, the scrambled sequence is I, individual sequences for the P-SCH is multiplied by a sequence of S-SCH and supplied to the multiplexing module 260. In this case, the sequence number of P-SCH in advance is explicitly associated with the sequence number of the scrambling. This differs from the first variant implementation of the present invention, according to which the sequence of the P-SCH is not explicitly associated with the sequence number of the scrambling. Since the P-SCH for some sectors chosen a different sequence, different scrambling sequence are multiplied by the S-SCH. For example, since the sequence P-SCH for cell includes three sectors, selected from a set containing three different sequence, the scrambling sequence to be multiplied by a sequence of S-SCH, also selected from the set containing three different scrambling sequence.

The module 110 of the detection timing in the mobile station 100 detects the timing and the sequence number of P-SCH based on the correlation values between the output signals of the module 106 multiplication code sequence and the code at the top level. After detecting the sequence number of P-SCH is diskriminirovaniya sequence S-SCH, multiplied by the sequence scramble the simulation, individual sequences for the P-SCH. Then, on the basis of the detected temporal parameters of the P-SCH module 112 detecting S-SCH detects the S-SCH by using the P-SCH as a reference signal.

In addition, in the cell search process in accordance with the diagram shown in Fig, in step S1106 is detected, the sequence number of the primary sync channel. Based detektirovanie sequence numbers of the primary sync channel can be defined sequence scrambling, private secondary sync channel, multiplied by the secondary sync channel. Next is diskriminirovaniya secondary sync channel, multiplied by the scrambling sequence, an individual for the primary sync channel. Then it moves to step S1108.

Thus, in the case where adjacent cells and/or cell of one base station use the same sequence of S-SCH, the interference from adjacent honeycomb can be is randomized, which improves the probability of detecting the S-SCH. In the search cell requires less time, and the temporal characteristics of the cell search can be improved.

In addition, in the case when in the course of detecting the S-SCH sequence based P-SCH performed is by the assessment of the channel, the channel estimation can be performed considering the state of respective channels of the honeycomb, which can improve the accuracy of channel estimation. A more accurate estimate of the channel may help to improve the accuracy of detecting the S-SCH.

In addition, in accordance with this embodiment of the present invention, the scrambling sequence, specific for P-SCH, applied to the sequence S-SCH (multiplied by this sequence). In contrast to the first variant of implementation of the present invention in this embodiment is set in advance a correspondence between the sequences of the P-SCH and the scrambling sequences, and this correspondence is known to the mobile station. The mobile station detects the timing of the SCH symbol on the first search phase cells and on the same phase also detects the sequence number of P-SCH. Because the sequence number of P-SCH is in one to one correspondence with the sequence number of the scrambling, multiplied by the S-SCH in accordance with this embodiment can determine the sequence number of the scrambling S-SCH based on detektirovanie sequence number P-SCH faster than when using the first option. For this reason, it is not required to detect the number of scrambling sequences S-SC of different types, for example, the number of scrambling sequences S-SCH three types. Thus, in the process sequence detection S-SCH can be generated sequence scrambling S-SCH three types without increasing the number of calculations.

In addition, when the detection of the primary broadcast channel (P-VSN, primary broadcast channel) can be generated sequence scrambling 510 types without increasing the number of calculations. As noted above, in the process sequence detection S-SCH may be used for the scrambling sequence S-SCH three types without increasing the number of calculations. This situation is described with reference to Fig. P-SCH contains a sequence of scrambling the three types and is not subject to scrambling. On the other hand, the S-SCH scramblies using a scrambling sequence, the individual P-SCH, for example by using the scrambling sequences of three types. P-BCS scramblies using a scrambling sequence, for individual cells, for example, by using scrambling codes 510 types. The sequence of the S-SCH is used to transmit information about a group of cells IDs 170 types in the orthogonal sequence, for example, short codes are of two types. For this reason, in the process of demodulating the R-VSN can is to be generated scrambling codes 510 types(three types of scrambling sequences) × (170 types of information about a group of cells IDs)) without increasing the number of calculations.

In addition, in the case when, during demodulation of the R-VSN estimating a channel based on a sequence of S-SCH, the channel estimation can be performed considering the state of the respective channels to separate cells, which can improve the accuracy of channel estimation. A more accurate estimate of the channel can improve the accuracy of the demodulation of the R-VSN.

The third variant embodiment of the invention

On Fig below shows some differences between the standard example of system implementation, the first, second and third variants of implementation of the present invention. In the standard example implementation of a system of primary channels P1, R2, R3synchronization is transmitted in the form of a P-SCH, respectively, in sectors 1, 2, 3. For example, if, as shown in the drawing, for one base station has three sectors, for specific sectors use different P-SCH, and thus, the user terminal can determine the residential sector and to obtain the value of the channel estimation in the resident sector. This possibility is similarly implemented in all variants of implementation of the present invention. In the standard example given information (SEi, where i is the parameter for the identification of hundreds)that specifies the different secondary synchronization channel to separate cells and sectors, the DVD is containing a single base station, sends the same secondary channel SEisync. As noted above, transmission of the same signals in adjacent sectors can reduce the probability of detecting the S-SCH is near the sector boundaries.

In accordance with the first and second variants of implementation of the present invention code SCjscrambling that is different for each sector is multiplied by the information SEiindicating the secondary sync channel. If different codes SCjscrambling is used for some sectors, even when using the same information SEifor all sectors of the works SC1×SEiSC2×SEiand SC3×SEiwill be different from each other. Thus, different S-SCH may be transmitted for specific sectors and demodulates with high accuracy even near the border of the sector. In accordance with the second embodiment of the present invention the primary channels Pisynchronization, which differ from each other for individual sectors, associated with codes SCiscrambling, great for some sectors, and this relationship is known to the user terminal. Thus, the S-SCH can be easily demodulated after confirmation of the primary channel P-SCH synchronization.

Since the scrambling codes used in what erom and second variants of implementation of the present invention, must be some codes (SEi), multiplied by the scrambling codes. However, in the framework of the present invention may not necessarily be the codes of two types (SCiand SEi). In accordance with a third embodiment of the present invention various generating polynomial equation Q1(X), Q2(X), Q3(X) are mapped to the primary channels P1P2, R3synchronization, different for each individual sector. For example, the generating polynomial equation Qi(X) can be represented as a polynomial equation to generate the codes, such as X5+X2+1. Although using a generating polynomial equations may be generated by any suitable sequence, it is desirable that this sequence was a sequence of the shift register with linear feedback (LSFR, linear feedback shift register), and more preferably an M-sequence. For example, it is assumed that the generating polynomial equation Q1(X)corresponding to the primary channel P1synchronization in the first sector corresponds to the polynomial equation for generating the M-sequence with a code length equal to 31. In this assumption, several any of the sequences from this set contains 31 codes of the second sequence, which can be generated using a generating polynomial equation Q1(X), are combined and used for the S-SCH in the first sector. Similarly, few of any of the sequences from a set containing 31 code sequence that can be generated using a generating polynomial equation Q2(X), are combined and used for the S-SCH in the second sector, and few of any of the sequences from a set containing 31 code sequence that can be generated using a generating polynomial equation Q3(X), are combined and used for the S-SCH in the third sector. The user terminal identifies the primary channel P-SCH synchronization and determines the residential sector. Then, based on the correspondence shown in the lower right corner on Fig, the user terminal identifies the generating polynomial equation, for example : Q1(X), which is applicable in the residential sector. Next, the user terminal through a comparison with the accepted signals determines which code 31 code that can be obtained using the generating polynomial equation Q1(X), is actually used for the S-SCH. P-SCH(Pi) one-to-one corresponds to a generating polynomial equation Qi(X),and, thus, if the user terminal can determine the residential sector, this user terminal is not required to consider codes that can be obtained from the generating polynomial equations for use in other sectors. The terminal user should consider only codes that can be obtained using the generating polynomial equations corresponding to one of the P-SCH. Although for simplicity illustrated affinity to one sector only a single generating polynomial equations, one sector may also correspond to a combination of several generating polynomial equations. In this case, other sectors may correspond to other combinations of multiple generating polynomial equations.

On Fig shows the partial block diagram of a base station in accordance with a third embodiment of the present invention. This drawing shows the module 2091control signal and synchronization module 2092signal synchronization. Although the flowchart presented on Fig and 7 are similar to Fig not shown module 258 generate a sequence of scrambling and the multiplier 256, as in this embodiment, the present invention does not use scrambling codes. One is to even in this embodiment, the present invention can be used scrambling codes. For example, if the same scrambling code is used for all sectors, the scrambling code is multiplied in the module 254 generation S-SCH. In addition, as disclosed in document 3GPP R1-072661 "Scrambling Method for Two S-SCH Short Code, scrambling code associated with the sequence number of the first short code short codes are of two types in the sequence S-SCH may be multiplied by the second short code in the module 254 generation S-SCH. Module 2091control synchronization signal controls the correspondence between the primary channel P-SCH synchronization and generating polynomial equation Qi(X). Module 254 generation S-SCH generates a secondary sync channel is used in accordance with instructions from module 2091control sync signal, and supplies the specified channel to the input module 260 multiplexing. In this embodiment of the present invention, the module 254 generation S-SCH generates codes based on the generating polynomial equation Qi(X)the specified module 2091control sync signal, and transmits the codes actually used as the S-SCH, the multiplexing module 260. Further, the synchronization channel, including the S-SCH are transmitted in module 2093data modulation and processed in accordance with the above operations for wireless transmission is I.

In the above descriptions of embodiments of the present invention as an example was cited of a system operating according to the technology Evolved UTRA and UTRAN (also referred to as Long Term Evolution or Super 3G), however, mobile station, base station and method for transmitting channel synchronization in accordance with the present invention can be applied to all systems that use OFDM for downlink communication lines.

Despite the fact that to facilitate understanding of the present invention were used, the specific numerical values, these digital values, unless specifically stated otherwise, provided for example only, and may be used instead of any appropriate values.

The present invention has been described with reference to specific embodiments of, but these options are shown only for example, and specialists in the art will be apparent various modifications, variations and modifications. For a better understanding of the principles of the present invention in the description of the examples are specific numerical values. However, unless otherwise noted, these numerical values are only examples, and may be any other suitable value. For simplicity of the device in accordance with the variants of the implementation of the infusion is his invention are explained using functional block diagrams, however, such devices can be implemented using hardware, software or a combination of these means. The present invention is not limited to the above disclosed variants of implementation. Changes, modifications and substitutions can be made by specialists in this field of technology without deviating from the essence of the present invention.

This application is based on application of Japan No. 2007-211593, filed August 14, 2007, the contents of which are entirely included in the present document by reference.

1. The base station containing the signal processor main frequency band, configured to receive data from the station to the upper level through the channel interface, the signal processor main frequency band includes a generation module, configured to generate the sync channel including a primary sync channel and a secondary sync channel; and a transmission module, configured to wirelessly transmit the signal including the sync channel, the user terminal through the antenna, the module generating a defined primary synchronization channel several types corresponding to the numbers of the sequence of the primary synchronization channel and the secondary sync channel includes a code defined by polynomial generating equations, predetermined in accordance with the numbers of the sequence of the primary synchronization channel.

2. The base station according to claim 1, wherein the generation module uses code corresponding to the sector.

3. The base station according to claim 1, characterized in that the code defined by the predefined generating polynomial equations, refers to the sequence of the shift register with linear feedback (LFSR).

4. The base station according to claim 3, characterized in that the code defined by the predefined generating polynomial equations, is an M-sequence.

5. The base station according to any one of claims 1 to 4, characterized in that the group of cells IDs and timing of radicata are identified by identifying the secondary sync channel.

6. A transfer method, namely, that:
generate the sync channel including a primary sync channel and a secondary sync channel; and
carry out a wireless signal including the sync channel, while
the step of generating a defined primary synchronization channel several types corresponding to the numbers of the sequence of the primary synchronization channel and the secondary sync channel includes a code defined by the generating polynomial equations, zarana is specified in accordance with the numbers of the sequence of the primary synchronization channel.

7. The method according to claim 6, characterized in that the step of generating use code corresponding to the sector.

8. The method according to claim 6, characterized in that the code defined by the predefined generating polynomial equations, refers to the sequence of the shift register with linear feedback (LFSR).

9. The method according to claim 8, characterized in that the code defined by the predefined generating polynomial equations, is an M-sequence.

10. The method according to any of PP-9, characterized in that the group of cells IDs and timing of radicata identify by identifying the secondary sync channel.

11. Radio system, containing
a base station configured to wirelessly transmit the sync channel including a primary sync channel and a secondary sync channel; and
the user terminal, configured to receive the sync channel from the base station, while
in the base station determined the primary synchronization channel of several types, corresponding to the numbers of the sequence of the primary synchronization channel and the secondary sync channel includes a code defined by the generating polynomial equations, predetermined in accordance with the numbers of primary sequences to the synchronization signals.



 

Same patents:

FIELD: information technology.

SUBSTANCE: techniques for determining cell timing in a wireless communication system are described. User equipment (UE) may obtain received samples which include at least one synchronisation signal generated based on a cell identifier. The UE may correlate the received samples with the at least one synchronisation signal in the time domain at different time offsets to obtain energies for multiple timing hypotheses. The UE may identify at least one detected peak based on the energies for the multiple timing hypotheses. The UE may then update a set of candidate peaks based on the at least one detected peak and may identify a candidate peak with signal strength exceeding the signal strength of a peak being tracked. The UE may provide the timing of the identified candidate peak as the timing of the cell.

EFFECT: faster cell search.

35 cl, 11 dwg, 1 tbl

Base station // 2438248

FIELD: information technology.

SUBSTANCE: base station, which sends a synchronisation signal over a synchronisation channel using the system frequency band which is less than the maximum system frequency band, in a radio communication system which supports use of multiple frequency bands, has a multiplexing unit configured to multiplex the synchronisation channel and a channel other than the synchronisation channel, based on reception filter characteristic used in the mobile station. The multiplexing unit can accommodate the synchronisation channel and the channel other than the synchronisation channel at continuous subcarriers. In another version, the multiplexing unit can allocate a protective band or a cyclic prefix for the transition band of the reception filter.

EFFECT: high accuracy of detecting signals.

2 cl, 7 dwg

FIELD: information technologies.

SUBSTANCE: method to assign a sequence and a device to assign a sequence are used in a system, where multiple different Zadoff-Chu sequences or GCL sequences are assigned to one cell, at the same time a number of arithmetic operations and extent of correlation circuit integration at a receiving end may be reduced. According to these method and device, at ST201 a counter (a) and a number (p) of current assignments of a sequence are initialised, and at ST202 it is identified whether the number (p) of current sequence assignments matches the number (K) of assignments to one cell. At ST203 it is identified whether the number (K) of assignments to one cell is odd or even. If K is even, at ST204-ST206, numbers of sequences (r=a and r=N-a), which are currently not assigned, are combined and then assigned. If K is odd, at ST207-ST212, for those sequences, to which a pair may not be selected, one of sequence numbers (r=a and r=N-a) is assigned, which are currently not assigned.

EFFECT: reduced volume of calculations.

8 cl, 17 dwg

FIELD: information technology.

SUBSTANCE: first and second sequences can be generated via circular shift a base sequence to a first and a second value, respectively. The base sequence can be a CAZAC (constant amplitude zero auto-correlation), PN (pseudorandom noise) sequence or some other sequence with good correlation properties. Circular shift of the first and second sequences can be defined based on a switching pattern. A first modulated sequence can be generated based on the first sequence and a first modulation symbol, and can then be sent over a first time interval. A second modulated sequence can be generated based on the second sequence and a second modulation symbol, and can then be sent over a second time interval. Each modulated sequence can be sent at K successive subcarriers using a localised frequency division multiplex (LFDM) scheme.

EFFECT: high throughput of the system with transmission of control information.

44 cl, 14 dwg

FIELD: information technology.

SUBSTANCE: method of transmitting control signal involves steps for multiplexing a plurality of 1-bit control signals within a given time-frequency domain via code division multiple access (CDMA) and transmitting the multiplexed control signals, wherein the plurality of the 1-bit control signals includes a plurality of 1-bit control signals for a specific transmitting side.

EFFECT: high efficiency and reliability of multiplexing.

10 cl, 9 dwg

FIELD: information technology.

SUBSTANCE: disclosed is a mobile station having: a module for correcting the transmission time interval which is configured to determine the transmission time interval in the mobile station - base station direction in units of the length of transmission time intervals in the base station - mobile station direction, such that the transmission time interval in the mobile station - base station direction is longer than that in the base station - mobile station direction; a transmission module configured to transmit a signal in the mobile station - base station direction in a transmission time interval defined by the module for correcting the transmission interval.

EFFECT: increase in the information transmission unit element on the time axis or frequency axis depending on conditions of the communication environment, which enables to lower the frequency of introducing the control channel and increase data transmission efficiency.

2 cl, 11 dwg

FIELD: information technology.

SUBSTANCE: base station communicates with a mobile station using OFDM via a downlink. The base station includes a clock signal generating module which generates an additional clock channel, a multiplication module which multiplies the scrambling code with the additional clock channel, and a transmitting module which transmits the additional clock channel which has been multiplied with the scrambling code. Cell-unique information is detected using the additional clock channel.

EFFECT: faster cell search.

17 cl, 13 dwg

FIELD: information technology.

SUBSTANCE: transmitting device has a frequency scheduling unit which is configured to allocate each user with either frequency blocks, which are serial carrier frequency blocks obtained by dividing the frequency band of the system, or distributed frequency blocks which are carrier frequency blocks which are discretely distributed in the frequency band of the system; and a conversion unit which is configured to associate transmitted data to frequency blocks or distributed frequency blocks in accordance with the allocation result. The frequency scheduling unit is configured to allocate distributed frequency blocks using frequency blocks as structural units and allocating sub-blocks obtained by dividing corresponding distributed frequency blocks.

EFFECT: high transmission capacity which enables the system to support localised and distributed data transmission.

23 cl, 41 dwg

FIELD: information technology.

SUBSTANCE: during transmission of a cell-specific pilot signal by a base station which can mix and then transmit unicast data and broadcast/multicast data as downstream data, the difference between the initial phase of a cell-specific pilot signal transmitted in a subframe in which the base station transmits the unicast data and the initial phase of a cell-specific pilot signal transmitted in the next subframe is equal to the difference between the initial phase of a cell-specific pilot signal transmitted in a subframe in which the base station transmits the broadcast/multicast data and the initial phase of a cell-specific pilot signal transmitted in the next subframe.

EFFECT: cell searching without increasing the scale or complicating the structure of the mobile station.

8 cl, 11 dwg

FIELD: information technology.

SUBSTANCE: transmitting device has a unit which provides a single-address channel; a unit which provides an MBMS channel; a unit which provides a unique pilot channel which is unique for a given cell; a unit which provides one or more common pilot channels which are common for several cells; a multiplexing unit which multiplexes the single-address channel, the MBMS channel, the unique pilot channel and one or more common pilot channels and generates a transmission symbol. The multiplexing unit performs time-division multiplexing on the same frequency band of the single-address frame containing the single-address channel, and the MBMS frame which contains the MBMS channel, wherein the input density of the common pilot channel contained in the MBMS frame is greater than the input density of the unique pilot channel contained in the single-address frame.

EFFECT: improved reception quality of an MBMS channel.

16 cl, 20 dwg

FIELD: communications engineering.

SUBSTANCE: proposed band selection method for mobile orthogonal frequency division multiple access communication system includes following steps to classify procedures of band selection between sending end and receiving ends with respect to original band selection process, passband width selection process, and periodic band selection process: determination of source band selection code (SC)number for source band selection process; SC number to request passband width for passband width request selection process and periodic SC number for periodic band selection process; determination of periodic SC deferment value in compliance with periodic SC number, and transmission of source SCs, passband width request SC, periodic SCs, and periodic SC deferment values on receiving ends.

EFFECT: minimized time for band selection access.

22 cl, 3 dwg, 4 tbl

FIELD: communications engineering.

SUBSTANCE: stationary wireless access system has, as a rule, user's room equipment unit connected through Ethernet interface to personal computer or to local network and base station unit connected through Ethernet interface to network. User's room equipment unit as such is easily installed by user while base station unit is usually mounted on mast at distance of 1 to 5 miles (1/6 to 8 km) from user's room equipment unit. Both the latter and base station unit usually incorporate integrated transceiver/data switch that provides for radio-frequency communications in the range of 2.5 to 2.686 GHz. Multiplexing with orthogonal frequency division of signals is used during transmission between user's room equipment units and base station ones over ascending and descending lines.

EFFECT: provision for using outwardly accessible antenna affording transmission within line-of-sight range.

70 cl, 19 dwg

FIELD: electrical and radio communications; underwater, radio, radio-relaying, and meteorological communication lines.

SUBSTANCE: start-stop communication system that has on sending end signal shaping and transfer unit 1 and on receiving end, receiver 2, amplitude detector 3, low-pass filter 4, first comparator 6, memory device 7, shift register 8, first decoder 9, switch 10, synchronizing unit 11, pulse shaper 12, pulse burst shaper 13, binary counters 14, 17, signal retrieval and storage device 19, and threshold device 5 is provided in addition with newly introduced second comparator 15, RS flip-flop 16, and second decoder 18.

EFFECT: reduced malfunction probability of proposed communication system.

1 cl, 3 dwg

FIELD: mobile telecommunication systems.

SUBSTANCE: device for decreasing relation of pike power to average power signal, sent along N(=2r) sub-bearing lines in transmitting device, having encoders for block encoding of w input data, where r - real number > 2, and output of N code symbols, has: serial-parallel converter for transforming data flow to w-(r-2) parallel data flows, where w - length of information word, first coder for receipt of w/2 parallel data flows from w-(r-2) parallel data flows from serial/parallel converter, block encoding of w/2 parallel data flows and output of N/2 first code symbols, generator of input operators for generation of r-2 data flows of input operators, in accordance to w-(r-2) parallel data flows, and second coder for receiving parallel data flows from serial/parallel converter, which were not received at first coder and (r-2) data flows from input operators, block encoding of received data flows and output of N/2 second code symbols, while r-2 data flows of input operators provide for complementarity of N code symbols.

EFFECT: higher efficiency, higher reliability.

6 cl, 22 dwg

FIELD: engineering of devices and methods for receipt and synchronization in direct digital satellite broadcast system.

SUBSTANCE: satellite system uses modulation with temporal signals separation and single-frequency network of ground-based re-emitting stations, each of which introduces a delay to ground signal. Delay allows to provide for coincidence of time of receipt of early modulated signal in the center of ground broadcasting zone with time of receipt of appropriate late modulated signal, thus improving switching between ground and satellite signals in receiver. Delay also compensates processing delay, occurring during conversion of satellite modulated stream under direct visibility conditions to multi-frequency modulated stream for transmission of satellite modulated stream under direct visibility conditions to user receivers. Delay is also adjusted in accordance to distance difference between each ground-based re-emitting station and satellite and between each station and center of ground-based broadcasting zone. Adjustment as described above optimizes receipt of temporal signals separation modulated and multi-frequency modulated signals by means of synchronization in the center of single-frequency system of phase of multi-frequency modulated signals, re-emitted from re-emitting stations of single-frequency system.

EFFECT: increased quality of radio-signal receipt.

8 cl, 12 dwg

FIELD: engineering of devices for generating series of preamble with low ratio of pike to average power in communications system with orthogonal multiplexing and frequency separation of channels.

SUBSTANCE: in accordance to method, first series of preamble is generated, wherein odd data of input series of preamble are transformed to zero data, and even data of aforementioned series are transformed to nonzero data, first series of preamble is transmitted through one of two antennas, second preamble series is generated, wherein even data of input series of preamble are transformed to zero data, and odd data of aforementioned series are transformed to nonzero data, second series of preamble is transmitted through another antenna.

EFFECT: increased efficiency.

6 cl, 10 dwg

FIELD: electric communications engineering, in particular, engineering of multichannel communication systems.

SUBSTANCE: system for transmitting discontinuous information contains at transmitting side information sources, multipliers, adder, clock generator, Walsh functions generator, 2n keys (where 2n - number of outputs of Walsh functions generator) and frequency splitter, two elements of one-sided conductivity and 2n additional multipliers, and on receiving side - clock generator, Walsh functions generator, multipliers, integrators, information receivers, 2n keys and frequency splitter, two elements of one-sided conductivity and 2n additional multipliers. As a new addition, on transmitting side two one-sided conductivity elements are inserted and 2n additional multipliers, and on receiving side - two one-sided conductivity elements and 2n additional multipliers.

EFFECT: decreased frequency band due to decreased effective width of channel carriers spectrum.

6 dwg, 1 tbl

FIELD: engineering of communication systems, using multi-access layout based on orthogonal multiplexing circuit with frequency division.

SUBSTANCE: communication system divides whole range of frequencies onto a set of sub-frequency ranges. Receiver of information about quality of channels receives information about quality of channels for each one of a set of frame cells, occupied during first time span by a set of frequency-time cells, occupied by second time span and a given number of sub-frequency ranges, transferred via check communication channel from receiver. Module for sorting frame cells analyzes information about quality of check communication channels and sorts frame cells in accordance to information about quality of channels. Module for assigning sub-channels, if transfer data exist, transfers data through a frame cell with best channel quality among other frame cells.

EFFECT: increased data transfer speed.

5 cl, 6 dwg

FIELD: electric radio engineering, possible use for increasing quality of electric communication, especially in multi-frequency wireless communication systems.

SUBSTANCE: method for decreasing ratio of peak signal power to its average ratio PAPR in multi-frequency communication systems, in which information symbol is formed by a set of signals, each one of which is centered on one of multiple bearing frequencies, is characterized by the fact that in transmitter a set of bearing frequencies is divided on several sections - subsets of bearing frequencies, information symbol, PAPR value of which does not exceed required threshold PAPR0, is transferred via all carriers, information symbol, value PAPR of which exceeds required threshold PAPR0 is divided on several sub-symbol sections, while number of these sections equals number of sub-carrier subsets, each section of symbol is transferred same as full symbol, wherein data are only transferred on one group of carriers, while other carriers are not modulated, in receiver, arrival of incomplete symbol is identified by analysis of amplitudes of carrier signals, which are not modulated in case of symbol division. Multi-frequency communication system is characterized by construction of receiver and transmitter, adapted for execution of operations, included in proposed method.

EFFECT: preservation of high channel capacity with simplified correction procedure.

2 cl, 12 dwg

FIELD: the invention refers to the field of radio technique and may be used for transmission of information with the aid of signals with orthogonal frequency multiplexing.

SUBSTANCE: the technical result is in increasing accuracy of synchronization of signals with orthogonal frequency multiplexing and that in its turn provides reduction of error possibility at reception of these signals even in such complex propagation conditions as shot-wave range channels. For this in the receiving set of the known equipment two memory blocks, two commutators, a maximum choice selection block, a meter and a time intervals calculation block are introduced.

EFFECT: increases accuracy of signals.

6 dwg

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