Method and device for transferring synchronization channel message in multi-frequency communication system

FIELD: radio communications.

SUBSTANCE: in multi-frequency system base station, using a certain set of frequencies for communication and sending data in multiple frequency bands, includes first transfer subsystem for sending synchronization channel message on one bearing frequency from set of preferable frequencies, at least an additional transfer system for transferring remaining data components on other bearing frequency. Mobile station in multi-frequency communication system contains control processor, providing for functioning of subsystems of receiver in accordance to data, contained in message of synchronization channel.

EFFECT: higher efficiency.

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The present invention relates to communication. More specifically, the present invention relates to a new and improved method and device for transmitting and receiving broadcast information in a multi-frequency communication system mdcr.

Using methods of modulation, multiple access, code-division multiplexing (mdcr) is one of several ways to improve communication in which there is a large number of users of the communication system. In the technique known other methods of multiple access communication systems, such as multiple access with time division multiplexing (mdvr) and multiple access frequency division multiple access (FDMA equipment). However, the modulation method of the extended spectrum mdcr has significant advantages over these methods of modulation for communication systems, multiple access. Using methods mdcr in the communication system, multiple access is described in U.S. patent number 4.901.307 called "communication System multiple access spread spectrum using satellite or terrestrial repeaters". Using methods mdcr in the communication system, multiple access is additionally described in U.S. patent number 5.103.459 called "System and method for generating waveforms in the system of the cellular telephone mdcr". Mdcr was standardized AC is Oceania industry telecommunications U.S. in the interim standards PS-95A and PS-V, called "Standard compatibility mobile station - base station for dual-mode systems with spread spectrum" (referred to here collectively as PS-95).

In communication systems PS-95 channels of information, transmitted from a common base station, differ from each other by orthogonal codes of the extension. Each channel extends a unique orthogonal expanding sequence. Channels transmitted by the base station PS-95, include the transmission channel pilot signal, a sync channel, at least one call channel and a dedicated traffic channels. Channels of transmission of the pilot signal are used to provide a reference phase for coherent demodulation of the other channels of the mobile stations in the service area of a base station. Additional service information bearing channel synchronization information is type information of the synchronization information PSH-mixing of the pilot signal and other information that allow other additional service channels. Call channel informs the mobile station about the ending of mobile stations calls directed to the movable stations in the area. Dedicated traffic channels provide information directed to the user of a particular mobile station in the service area of a base station.

In the PS-95 when the transmission of the Message Channel is nchronization base station should use the message format fixed length, below in Table 1.

TABLE 1
FieldLength (bits)
MSGTYPE (‘00000001’)8
PREV8
MINPREV8
SID15
NID16
PILOTPN9
LCSTATE42
SYSTIME36
LPSEC8
LTMOFF6
DAYLT1
PRAT2
CDMAFREQ11

MSG_TYPE Message Type

P_REV Level Protocol version.

MIN_P_REV the Lowest level version of the Protocol. The base station sets this field to prevent access to the system mobile stations, which may not be supported by the base station.

SID is the system ID. The base station shall set this field to the number of system ID for this is th system.

NID network ID. This field serves as pidentifier system, as defined by the owner SID. PILOT_PN Index offset PN sequence pilot signal. Vasova station shall set this field to the offset of the PN-sequence for this base station, in units of 64 PN-samples.

LC_STATE the state of the long code. The base station shall set this field to the state of the long code at the time you set SYS_TIME field of this message.

SYS_TIME System time. The base station shall set this field to the System Time, as after the end of the last of the four superquadras channel synchronization (320 MS) superquadra containing any part of this Message, Channel Synchronization, minus the offset of the PN sequences of the pilot signal, in units of 80 MS.

LP_SEC the Number of spikes in seconds that have occurred since the start of System Time.

LTM_OFF the local time Offset relative to the System Time. The base station shall set this field to the binary additional offset of the local clock relative to the System Time, in units of 30 minutes.

DAYLT the time Indicator daylight savings. If there is a day savings, then the base station shall set this field to ‘1’;

otherwise the base station shall set this floor is to ‘0’.

PRAT Speed data transmission Channel of the Call. The base station shall set this field to the value of the field PRAT, shown in Table 2, the corresponding data rate used in the system of Channels of the Call.

TABLE 2.

Data transfer rate Channel Call
Field PRAT (binary)Data transfer rate Channel Call
009600 bits/s
014800 bit/s
10Reserved
11Reserved

CDMA_FREQ Selection frequency. The base station shall set this field to the Channel number mdcr corresponding to the selected frequency mdcr for Channel mdcr containing a Primary Channel of the Call.

In communication systems PS-95 each base station transmits the channel information of the pilot signal, which covered only a short PN sequence. In communication systems PS-95 short PN sequences are repeated once every 26ms. Transmitting a pilot signal from each base station are different relative to each other by a phase offset relative to each other. Specifically, each base station associated with one base station controller, differs in phase at least 64 PSH-d is skreta.

In normal operation, the mobile station first performs the capture of the pilot signal. The pilot signal has no data and is simply the universal sequence, extended shared short code, which extends all the other channels transmitted by the base station. After the capture channel, transmitting the pilot signal, the mobile station receives the above information from the sync channel. The synchronization frame and the interleaver for channel synchronization is aligned with the PN sequence of the pilot signal. The zero state of the short PN sequence marks the starting point of the channel frame synchronization and code-matched.

In the spectrum of a personal communication system (PJC) USA, nth channel mdcr determines the carrier frequency of the forward and reverse channels of the communication line. In particular, the number N of the channel corresponds to the carrier frequency (1850+0,05 N) MHz return line connection and the carrier frequency (1930+0,05 N) MHz straight line, where N is from 0 to 1199. Bandwidth of each channel mdcr is 1.25 MHz. Therefore, the number of channels adjacent channels mdcr differ by at least 25 (25*0,05 MHz=1,25 MHz). To facilitate the initial capture of the mobile stations, some carrier frequencies are indicated as preferred selected frequency. According to figure 1 for communication systems mdcr, PS-V, under the bandwidth of the PCA, numbers of preferred channels allocated frequencies are 25, 50, 75, 100, 125, 150, 175, 200, 225, 250 and 275. After you enable the first mobile station will search for the preferred selected frequency.

The international telecommunication Union has recently made request for the performance of the proposed methods of providing services for high-speed data and high-quality speech radio channels. The first part of these proposals, issued by the Association of the industry of telecommunication, called "Possible deals on radio access technologies MDCR ITU-R" (referred to here as MDCR). According MDCR proposed to increase the bandwidth of the signals straight line by passing pieces of information in three frequency bands, each in 1,2288 MHz. This method describes as "multi-frequency" approach.

In MDCR defined multi-frequency communication system mdcr using three adjacent RF channel width of 1.25 MHz, the separation channels are also components of 1.25 MHz. According to figure 2 multi-frequency communication system mdcr can be deployed in the band And the bandwidth of the PCA with the Central channel on the channel 50, 75, 100, 125, 150, 175, 200, 225 or 250. The channels 50 and 250 are typically not used, to avoid interference with adjacent frequency bands on the reverse link. In the proposed description MDCR reverse link may be whether the Oia connection with the direct expansion rate readings 3,6864 s, what complicates the satisfaction of the requirements for limiting radiation, compared with the speed readings in 1,2288 cs.

After you enable the mobile station searches for the pilot signal at the preferred frequency. If the pilot signal is not found in the active channel, it changes the channel and again searches. When you capture the pilot signal, the mobile station demodulates the Channel Synchronization, corresponding to this pilot signal for data reception synchronization, PN-offset of the pilot signal and other information that allow other additional service channels.

When the multi-frequency approach one way to provide data of the Sync Channel can be the implementation of the three-partial message Channel Synchronization and the placement of one third part of the message on each of the three parts of the multifrequency signal. If the Channel Synchronization, multi-frequency communication system extends through three channels, the mobile station must know the specific channels used by the system to reliability to demodulate the Sync Channel. Since the channel is not known in advance, the mobile station should test many combinations for receiving message Channel Synchronization. When you set the preferred number of channels, the time spent on such tests may be excessive, and sledovatelno, to worsen the initial timing in the mobile station. Therefore, in the technique there is a need for a method that minimizes the search time in the mobile station.

The present invention relates to a new and improved method and apparatus for transmitting broadcast information in a multi-frequency communication system. The proposed invention consists in the transfer channel synchronization, multi-frequency communication system in the bandwidth of the channel is 1.25 MHz (i.e., one carrier), and in determining the preferred channels for transmission of the sync channel instead of the preferred channels for the entire multi-frequency communication system. Message Channel Synchronization determines the center frequency for multi-frequency communication systems in the frequency band, if available, and the frequency single-sideband communication system, if available.

Returning to the review group And the bandwidth of the PCA, as the preferred channel for transmission of the Sync Channel can be selected channels 75, 150 and 225. This choice with the guarantee provides that one of the preferred channels will always be used for any multi-frequency communication system, regardless of the location of its Central channel. The mobile station after inclusion of the first searches for Channel Synchronization in their preferred channels. When the capture of the pilot signal on any of these channels, the mobile station also carries out demodulation Channel Synchronization in this channel. Mobile station from the message Channel Synchronization learns the location of the multi-frequency communication system and a single-frequency communication systems in the frequency band, if any of them have. Readily observed that by using sentences of this invention, the number of channels to search and the number of hypotheses that must be tested, is significantly reduced. As a result, it improves the initial timing for the mobile station.

The features, objectives and advantages of the present invention will be clearer from the following detailed description, illustrated in the drawings, which use sequential numbering.

1 is an explanatory diagram of the frequency band of the ATP system for a communication system with a spectral width of 1X.

2 is an explanatory diagram of the frequency band of the ATP system for a communication system with a spectral width of 3.

3 is a flowchart illustrating a method of capture according to the present invention.

Figure 4 is a structural diagram illustrating the basic elements of the radio system.

Figure 5 is a simplified functional diagram of the multi-frequency data transmission systems.

6 is a functional diagram of the system modulation mdcr.

7 is a simplified functional diagram of the system multi-frequency receiver.

Fig is a functional diagram is istemi demodulation mdcr.

Figure 1 illustrates the standard chart of frequency bands for multi-band communication systems. In the radio communication mobile station engaged in attempting to start the service, will be configured on every possible frequency in the preferred set of frequencies and to determine whether the communication system at this frequency. According to figure 1 for the preferred frequency of the allocated channel numbers 25, 50, 75, 100, 125, 150, 175, 200, 225, 250 and 275, which correspond to the frequency bands 200A, 200b, 200C, 200d, 200e, 200f, 200g, 200h, 200i, 200j and 200k. In a possible embodiment, the width of each of these frequency bands is 1.25 Mhz and is used to perform data transfer mdcr PS-95.

Figure 2 shows a possible Central band multi-frequency communication system with three components in accordance with mdcr 2000 (also referred to as PS-2000). In multi-frequency communication system mobile station is configured for each possible grouping of three adjacent channels and attempts to receive a message Channel Synchronization.

In existing projects multifrequency systems message Channel Synchronization will be divided into three constituent parts, with each part, transmitted separately and simultaneously on different carrier frequency bands. First, the mobile station shall attempt principle is th message Channel Synchronization frequency multi-frequency communication system, contains band 300b, 300c, 300d. Then, if it is unsuccessful, the mobile station shall attempt to seize the Channel Synchronization frequency multi-frequency communication system, consisting of bands 300c, 300d and e. This continues for each possible three-way communication system, while the mobile station verifies multi-frequency communication system, consisting of bands 300h, 300i, and 300j. For the above reasons, in a possible embodiment, the frequency band 300A and 300k will not be used in multi-frequency communication system.

This method of message receiving Channel Synchronization is very inefficient and time consuming. If the mobile station provides functioning in multi-frequency or single frequency mode, potentially, the mobile station shall eleven searches width IX, or browse the bandwidth 200a-200k, and seven multi-frequency searches using the Central frequency 300c-300i. In the communication system mdcr search for each frequency band requires the mobile station checks a large number of PN-offsets to detect the presence of the pilot signal. Thus, this method of capture requires a substantial time interval.

The present invention provides a much more efficient way to capture the necessary system settings in the system due to the potentially mixed Olocau frequencies. According to the present invention, the Sync Channel is always transmitted in the frequency band width of the IX. In a preferred embodiment, the preferred channels are channels 75, 150 and 225. Thus, from the mobile station is only required to perform not more than three searches for receiving message Channel Synchronization in the frequency band width of IX to capture the necessary information to capture is the preferred system. The present invention significantly reduces the time of capture in the communication system with a mixed band of frequencies. Additionally ensure communication Channel Synchronization only on the preferred channels reduces the impact on throughput from providing additional service information on a much larger number of channels.

According to the present invention by reason of the distribution of the preferred channel is to provide the greatest flexibility in terms of multi-frequency communication system. When the distribution of preferred channels channel numbers 75, 150 and 220 (300c, 300f, and 300j), multi-frequency communication system provided somewhere in the band, consisting of bands 300A-300k, will contain one of the preferred channels. Multi-frequency system containing bandwidth 300A, 300b and 300c, will contain the preferred channel 300c. Multi-frequency system, the content is Asa bandwidth 300b, 300c and 300d, will contain the preferred channel 300c. Multi-frequency system containing bandwidth 300c, 300d and e will contain the preferred channel 300c. Multi-frequency system containing bandwidth 300d, e and 300f, will contain the preferred channel 300f. Any combination of three adjacent frequency bands will contain the preferred channel through which the mobile station will be able to take the necessary for the functioning of the system settings.

According to the present invention the mobile station is configured to preferred channel (300c, 300f or 300i) and attempts to detect the pilot signal on this band. Upon detection of the pilot signal, the mobile station receives, demodulates and decodes the message Channel Synchronization. According to the present invention, the message Channel Synchronization will provide information that identifies the center frequency of the multi-frequency system in the active set of frequency bands (if any) and the frequency band width of IX in the active set of frequency bands (if any).

The mobile station in response to data acquired using the Sync Channel, selects a communication system appropriate to its needs or opportunities. If the mobile station prefers the use of multi-frequency communication system, it COI is lesuit the center frequency of the multi-frequency system, defined in the message Channel Synchronization settings on the multi-frequency system and receive messages broadcast channel (VC). Message broadcasting channel is determined for the mobile station, the number of common control channels (CMOS)used by the active communication system. The mobile station receives the number of shared control channels and using a predetermined hashing algorithm, determines which code channel it will use to receive messages call from the transmitting base station.

If the mobile station selects the operation in the single-sideband communication system, it uses the information received in the message Channel Synchronization for tuning to the appropriate frequency single-sideband communication system. Then the mobile station receives a General message channel call primary call channel. The overall message of the call channel provides the number of channels of the call used single-sideband communication system. The mobile station uses a predefined hash function to determine the code of the channel on which the mobile station will receive the message call from the transmitting base station.

The present invention is equally applicable to systems that may contain communication systems with direct expansion of the range of width 3. This var is ante implementation of the message Channel Synchronization must contain additional information, is the communication system width 3 communication system with direct expansion range or multi-frequency communication system. Additionally, the message Channel Synchronization may also provide information on whether the communication system form explode on the transmission-type orthogonal explode on the transfer (PPR). If in a multiline communications system can provide ways to explode on the transfer, technical features, performing diversity transmission, greatly reduce the number of hypotheses that need to be checked for capture system.

These changes in Channel message Synchronization can be performed without the need to expand the message Channel Synchronization used in the PS-B and illustrated above. In an existing message Channel Synchronization has a large number of reserved bits that can be used to provide additional information.

Figure 3 shows a block diagram explaining the operation of the gripper according to the present invention. In unit 2, the mobile station tunes to the preferred channel (300c, 300f or 300i). It should be clear that the present invention is disclosed in the context of the bandwidth of the PCA and can be easily extended to other frequency bands, types of frequency bands for cellular communication. In addition to the, although preference is defined for multi-frequency communication system with three carriers, the selected set of preferred channels will be different for multi-frequency systems with different number of carriers.

In block 6 the mobile station determines whether a successful search operation. In a possible embodiment, the present invention is integrated into a communication system mdcr, although it is equally applicable to other communication systems with mixed frequency band. In a possible embodiment, the mobile station adjusts its RF receiver on the preferred channel (300c, 300f or 300i) and attempts to detect the presence of the pilot signal. In a possible embodiment, with the communication system mdcr based on PS-95, each base station transmits its pilot signal using the unique offset pilot signal. Thus, the mobile station after tuning to preferred channel (300c, 300f or 300i) looking at possible hypotheses PN-offset.

Method and device for detecting the pilot signal in the communication system mdcr known in the art and are described in detail in U.S. patent number 5644591 called "Method and apparatus for implementing a search and seizure in the communication system mdcr". The mobile station checks each hypothesis PN-offset, calculating a correlation between the received inside the preferred p is band frequency signal with the audited current-hypothesis. If the correlation energy for all PSH-hypotheses less than the threshold value, the grip on the preferred frequency is not successful, and the operation goes to block 4. In unit 4, the mobile station selects the next preferred channel (300c, 300f or 300i) for validation, and the sequence of operations goes into the block 2 and continues as described above.

When the mobile station detects a sufficient correlation energy between the received on the preferred frequency channel signal and the hypothesis PN-offset, declared the successful capture. At this point, the operation proceeds to block 8. In block 8 the mobile station receives a message Channel Synchronization. According to the present invention, the message of the Sync Channel is transmitted in the same frequency band width IX (300c, 300f, or 300i). In a possible embodiment, the communication system mdcr based on PS-95 boundary of the Channel frame Synchronization and the border of the interleaver is aligned with the short PN sequence used to extend the signal transmission channel pilot signal. Thus, with the successful capture of the signal transmission channel pilot signal, the mobile station has sufficient information to converted interleave and decode the message Channel Synchronization.

Upon receipt of a message Channel Sync is the operation proceeds to the block 10. Mobile station from the message Channel Synchronization determines the center frequency of the multi-frequency communication systems in the active set of frequency bands (if any) and location in the bandwidth of one carrier in the active set of frequency bands (if any). Based on their capabilities and needs, the mobile station decides to function in multi-mode or single channel mode.

The operation of the switches in the control block 10. If the mobile station having the ability to function in multi-frequency mode, decides to function in multi-frequency mode, the sequence proceeds to the block 12. In block 12 the mobile station initializes its equipment for multi-frequency reception. Mobile station from a received message Channel Synchronization learns the center frequency of the multi-frequency communication systems in the active set of frequency bands, if it is available. Then, the operation goes to block 14, where the mobile station receives the signal of the broadcast channel (VC), and from this channel among other information, learns the number of shared control channels used by the communication system. The mobile station hashes the number of shared control channels to determine the code channel that should be used to receive the call.

If that is mainly what about the block 10, the mobile station decides to use a single-channel system due to capacity constraints or other preferences associated with the requested service, then the operation proceeds to the block 16. In block 16 the mobile station initiates its RF equipment for single-frequency reception. Then the operation proceeds to block 18, where the mobile station receives a General message call to a predefined code channel. The overall message of the call will set the number of channels of the call used by the communication system. The mobile station hashes the number of channels of the call that is used to define code channel, which is used to receive direct calls from the serving base station.

Figure 4 shows the elements and the callout very simplified radio system. The base station 30 transmits a signal 32 straight line connection of the mobile station 40. The mobile station 40 transmits a signal return line 34 communication base station 30.

Figure 5 shows a simplified functional diagram illustrating a possible implementation of the base station 30, as multi-frequency data transmission systems mdcr with three channels of direct communication line. Each subsystem 48 transmission transmits part of the signal 32 a straight line on a different carrier frequency. The treatment tip can the system 48A data transmitting side signal 32 a straight line at a frequency f 1the subsystem 48b data transmitting side signal 32 a straight line at a frequency f2and subsystem 48S data transmitting side signal 32 a straight line at a frequency f3.

Data for transmission to the signal 32 straight line are fed to the demultiplexer 50. Demultiplexer 50 delivers the data to one of the three subsystems 48 data. The present invention is described in terms of multi-frequency communication system with three carriers, as three bearing PS-95, occupying 1.2288 MHz each, can fit into a band of frequencies in 5MHz. However, to know the technique it will be clear that theory of the present invention can be easily extended to an arbitrary number of channels in multi-frequency communication system.

Threads demultiplexing data are fed to the modulator 52. In a possible embodiment, the modulators 52 carry out the modulation data a straight line in accordance with the modulation format mdcr, such as described in the standard PS-95 and described in detail in the aforementioned U.S. patent number 5103459. Data direct communication lines contain the data of the selected channel, which serves to provide a specific mobile station, and the data of the broadcast channel that is being used to ensure that all mobile stations in the service area of the base station 30, or a subset of the ACC is the author of 40 stations in the service area of the base station 30. Message Channel Synchronization is an example of the broadcast data that is transmitted to all mobile stations in the service area of the base station 30. According to the present invention, the message Channel Synchronization is served on the assigned one of the subsystems 48 transmission for transmission on the assigned one of the three carriers.

The modulated data is a straight line from the modulator 52 is fed to the Converter 54 with increasing frequency. The Converter 54 with increasing frequency transforms with increasing frequency modulated signal to the carrier frequency (f1f2or f3)generated by a local oscillator (not shown). Then the signals are converted with increasing frequency, are combined for transmission via the antenna 56.

Figure 6 shows a possible implementation of the modulators 52, baseband portion of the signal, a direct line of communication to transmit on the same carrier signal 32 a straight line. In a possible embodiment, the transmission of the pilot signal is carried out to ensure coherent demodulation of the signal receivers, improving the efficiency of the receiver by providing a reference phase for demodulation. The set of symbols of the pilot signal is known and the base station 30 and the mobile station 40, is fed to the expander 60 Walsh. The extender 60 Walsh extends the symbols of the pilot signal sequence is J. Walsh Pilot. In a possible embodiment, the Walsh sequence used to distinguish between data channels transmitted on the same carrier mdcr. The Walsh code may be a fixed number of characters, as described in the specifications PS-95, or orthogonal function, changing the length in accordance with the speed of data transmitted over the channel, as described in the proposals MDCR and in U.S. patent number 5751761 called "System and method for forming orthogonal sequence spread spectrum communication systems with variable data rate".

Symbols of the pilot signal, enhanced with the use of the Walsh function, served on a comprehensive PSH-expander 62. Comprehensive PSH-expander 62 extends the symbols of the pilot signal, enhanced with the use of the Walsh function, in accordance with two separately formed pseudocumene (PN) sequences, PSHCand GSHK. If two inputs to an integrated PSH-extender 62 is indicated as C and K, the result of the operation of the complex extension are two channels With’ and’, defined by the equations:

The complex PN-expansion is more uniform load distribution on the in-phase and quadrature channels of the modulator quadrature phase-shift keying(CPM modulator), which leads to the decrease of the ratio of peak to average the power amplifier (not shown) of the base station 30, which, in turn, increases the throughput of the base station 30. Comprehensive PSH-extension is described in the proposals for the radio access technologies MDCR and described in detail are in the process of simultaneous consideration of the patent application U.S. serial number 08 886.604 called "radio System mdcr with high-speed data. Symbols of the pilot signal, advanced comprehensive PSH-expansion, served on a transmitter (TMTR) 94, which converts with increasing frequency, filters and amplifies the signal for transmission via the antenna 56.

In a possible embodiment, the message Channel Synchronization differs from the information of other channels extension unique orthogonal sequence extensionsSingh. In a preferred embodiment of the present invention, the message Channel Synchronization only transmitted by modulator selected from the modulators 48a, 48b or 48S. The selected modulator 48 transmits the message of the Sync Channel preferred channel. In a possible embodiment, the message Channel Synchronization determines the center frequency of the multi-frequency communication system in an active band, if available, and the frequency is gnochetti communication systems in the active set of frequency bands, if it is available.

Message Channel Synchronization is supplied to the formatter 64 messages. In a possible embodiment, the formatter 64 messages generates a set of bits CRC (ICC) and an optional set of tail bits, and adds these bits to the message Channel Synchronization. Systems PS-95 tail bits to the message Channel Synchronization are added. In systems MDCR (also referred to as PS-2000) to the message Channel Synchronization added eight tail bits. Message Channel Synchronization with added bits ICC and tail bits is fed to the encoder 66. The encoder 66 encodes the message Channel Synchronization bits ICC and tail bits in accordance with a predefined encoding algorithm with error correction on the aisle, type convolutional encoding.

Then, the encoded symbols are served on the interleaver (PER) 68, which reorder the encoded symbols in accordance with a predefined format interleave. Interleaver is provided to ensure explode time within the media stream encoded characters. Decoders better perform error correction when errors in the accepted thread is not the error information of the stack.

The reordered symbols are fed to the expander 70 Walsh, EXT is in store reordered symbols in accordance with a predefined code sequence Y Singh. In a possible embodiment, YSinghis a code sequence that is orthogonal to all other code sequences used for the formation of channels of signal 32 a straight line. Then the signal enhanced using Walsh functions, served on a complex PSH-expander 62 and extends as described above.

Messages for the shared channel is transmitted to all subscriber stations or sets of subscriber stations within a coverage area of the base station 30. Examples of messages are messages call alert mobile station of incoming calls and messages on the control channel, providing mobile stations in the service area of the base station 30 the necessary management information. For illustrative purposes shows one control channel. To know the technique it will be clear that in practical implementations, the base station 30 will be transmitted many control channels.

The message Shared Channel is supplied to the formatter 74 messages. In a possible embodiment, the formatter 74 messages generates a set of bits CRC (ICC) and a set of tail bits, and adds these bits to the message Shared Channel. The message Shared Channel with added bits ICC and tail bits is fed to the encoder 76. To the EP 76 encodes the message Shared Channel, the bits of the ICC and the tail bits in accordance with a predefined encoding algorithm with error correction on the aisle, type convolutional encoding.

Then, the encoded symbols are served on the interleaver 78 (PEN), which reorder the encoded symbols in accordance with a predefined format interleave. Interleaver is provided to ensure explode time within the media stream encoded characters. Decoders better perform error correction when errors in the accepted thread is not the error information of the stack.

The reordered symbols are fed to the expander 82 Walsh, extending reordered symbols in accordance with a predefined code sequence YKU. In a possible embodiment, YKUis a code sequence that is orthogonal to all other code sequences used for the formation of channels of signal 32 a straight line. Then the signal enhanced using Walsh functions, served on a complex PSH-expander 62 and extends as described above.

Data of the Selected Channel is transmitted to a particular subscriber stations within a coverage area of the base station 30. Data of the Selected channel are fed to the formatter 84 the message is rd. In a possible embodiment, the formatter 84 messages generates a set of bits CRC (ICC) and a set of tail bits, and adds these bits to the frame data of the selected channel. The frame data of the Selected Channel with added bits ICC and tail bits is fed to the encoder 86. The encoder 86 encodes the frame data of the Selected Channel, the bits of the ICC and the tail bits in accordance with a predefined encoding algorithm with error correction on pass type Turbo coding or convolutional encoding.

Then, the encoded symbols are served on the interleaver 88 (PEN), which reorder the encoded symbols in accordance with a predefined format interleave. Interleaver is provided to ensure explode time within the media stream encoded characters. Decoders better perform error correction when errors in the accepted thread is not the error information of the stack.

The reordered symbols are fed to the expander 90 Walsh, extending reordered symbols in accordance with a predefined code sequence Yt. In a possible embodiment, Ytis a code sequence that is orthogonal to all other code sequences used on the I forming channels signal 32 a straight line. Then the signal enhanced using Walsh functions, served on a complex PSH-expander 62 and extends as described above.

Advanced integrated PSH-expander data are fed to the transmitter (TMTR) 94 and converted with increasing frequency, are filtered and amplified for transmission through the antenna 56.

According to Fig.7 illustrates a simplified multi-frequency receiver is provided in a possible embodiment, in the mobile station 40. In a possible embodiment, the mobile station 40 provides simultaneous reception of signals 32 a straight line passed through the frequency channels in an amount up to three frequency channels. To know the technique it will be clear that the present invention can be extended to multi-frequency reception arbitrary number of channels. The received signal is fed to each of the subsystems 105, which carry out the conversion with decreasing frequency and demodulation of different signal components 32 direct communication line in accordance with a unique carrier frequency.

The signal 32 direct communication line is received by the antenna 100 and is supplied to the receivers 102. Each of the receivers 102A, 102b and 1 0 2 converts with decreasing frequency, filters and amplifies the received signal in accordance with different frequency f1f2or f3respectively. Signals, transformed the broken off with decreasing frequency, fed to the demodulator 104. In a possible embodiment, the demodulator 104 demodulator each converted to a lower frequency signals in accordance with the modulation format, multiple access, code-division multiplexing (mdcr). Implementation of the demodulator 104 is described in detail in the aforementioned U.S. patent number 5103459. The demodulated signal components 32 of the straight line are fed to the multiplexer (MPX) 106, which performs the reassembly of the transmitted data stream.

According to the present invention the mobile station 40 is initially uses only one receiver 102 and demodulator 104. The mobile station 40 configures the selected receivers 102 in the preferred channel (300c, 300f or 300i) and attempts to capture the pilot signal at the preferred frequency channel using the demodulators 104. Upon detection of sufficient correlation energy capture is declared successful. Then the mobile station with only conversion with decreasing frequency at the same frequency, demodulates, provides turned interleaving and decodes the message Channel Synchronization. From the message Channel Synchronization, the mobile station 40 determines the center frequency of the multi-frequency communication system in the active frequency bands, if any, and the frequency oznachaet is based communications systems in the active frequency bands, if it is available.

The mobile station 40 decides functioning in multi-mode or single-mode. If the mobile station 40 decides functioning in multi-frequency mode, it activates additional receivers 102 RF circuits, tuning in to a corresponding set of frequencies defined in the message Channel Synchronization, and begins to take the signal straight line on many carrier frequencies. If the mobile station 40 makes a decision on the functioning of the single frequency mode, it is configured on the corresponding frequency defined in the message Channel Synchronization and begins to take the signal straight line on a single frequency band.

On Fig shows a device for receiving the signal 32 a straight line in a possible embodiment, the communication system mdcr. Initially, mobile station 40 must tune in to your preferred channel and in the following way to attempt capture of the pilot signal on this channel.

Signals 32 direct lines of communication are received by the antenna 100 is fed to the receiver 102. The receiver 102 is tuned to the frequency of the preferred channel, and performs conversion with decreasing frequency, filtering and amplification of the received signal. In a possible embodiment, the receiver 102 is a receiver to attorney phase shift keying and output is in-phase () and quadrature (K) components of the received signal.

Two components of the received signal are comprehensive PSH-sphincter 112. Comprehensive PSH-sphincter 112 compresses the received signal in accordance with two pseudocumene sequences PSHwithand PSHto. In a possible embodiment, PSH-compression is a complex PSH-compression, as described in detail in the above-mentioned are in the process of simultaneous consideration of the patent application U.S. serial number 08.886.604. In a possible embodiment, PN-sequence used to enhance signals 32 a straight line, are generated using a polynomial generator, which is common to all base stations 30. Expansion of signals from base stations differ from each other by the shift of the sequence.

The processor 128 management delivers the hypothesis bias on complex PSH-sphincter 112. Comprehensive PSH-sphincter 112 compresses the received signals in accordance with the hypotheses PN-offsets supplied by the processor 128 management, as well aspilot. The received signal is compressed in accordance with the hypothesis of PN-offsets and the resulting signal is fed to the filter 114, the pilot signal. The filter 114, the pilot signal compresses the signal from the integrated PN-sphincter 112 in accordance with an orthogonal sequence Ypilotand filters out the lower frequencies in whitefish is Ala, resulting from sphincter complex 112. In a possible embodiment for the pilot channel signal is used by the Walsh sequence containing all 1.

The signals from the filter 114, the pilot signal fed to the detector 118 power, which sums the squares of the final samples of the filter 114, the pilot signal for providing power value of the received pilot signal. Power value of the received pilot signal is supplied to the CPU 128 controls, where it is compared with a predefined threshold value. If the calculated power exceeds the threshold value, then the capture is declared successful and the mobile station starts to receive the message Channel Synchronization. If the power drops below a threshold, then the capture is declared failed and the CPU 128 controls served on complex PSH-sphincter 112 next PSH-hypothesis. Method and device for searching PN-offsets in the communication system mdcr described in detail in U.S. patent number 5644591 called "Method and apparatus for implementing a search and seizure in the communication system mdcr". If possible hypotheses PN-offset exhausted, the power of the received pilot signal fails to exceed the threshold value, then the control processor transmits to the receiver 102 message - begin-conversion downconverter principle is that in another preferred frequency channel signal.

After the successful capture of the transmission channel, the pilot signal at the preferred frequency channel, the mobile station 40 demodulates and decodes the message Channel Synchronization. Adopted from the receiver 102, the signal is compressed using a PN-offset defined by the search algorithm, the pilot signal. The pilot signal is processed by the filter 114, the pilot signal as described above.

PSH-compressed signal is also fed to the sphincter 116 Walsh. The sphincter 116 Walsh compresses the received signal in accordance with a code sequence of WalshKahn. When demodulation Channel Synchronization InKahnis a sequence of Walsh allocated for transmission of the message Channel Synchronization. The sphincter 116 Walsh compresses the signal components in accordance with an orthogonal sequence YKahnand delivers the result to the circuit 120 of the scalar product.

When passing the signal 32 a direct line of communication pathways to the mobile station 40 in the received signal is entered unknown phase component. The circuit 120 calculates the scalar product of the projection of the received signal determined pilot signal to provide a scalar result without error phase. In the technique known implementation schemes scalar product for coherent demodulation and method and a device for implementing the procedure of the SC is popular works are described in detail in U.S. patent number 5506865, called "the Scheme of the scalar product of the carrier pilot signal.

Scalar output circuit 120 of the scalar product are fed to the multiplexer 122, which combines the two received stream into a data stream signal. The data stream from the multiplexer 122 is supplied to the device 124 is turned alternation, which reorder the received symbols in accordance with a predefined format converted alternations. The reordered symbols are fed to the decoder 126, decoding the characters of the message Channel Synchronization to ensure that a received message Channel Synchronization.

Received message Channel Synchronization is supplied to the CPU 128 controls. According to the present invention, the processor 128 of the control Channel messages Synchronization determines the frequency channel to primary channel for more service information single-frequency communication system or the center frequency of the multi-frequency communication system. In response to the message Channel Synchronization processor 128 control initiates the correct number of subsystems 105 receiving and adjusts them to the appropriate channels to receive signals 32 a straight line.

The preceding description of the preferred embodiments of the proposed invention will provide any expert in the art the possibility of use the to present invention. For specialists will be apparent various modifications to these embodiments, and without much ingenuity defined here generalized principles can be applied in other embodiments of the proposed invention. Thus, the present invention is not limited to disclosed above options, but is intended for use in wide areas, not contradicting the principles and distinctive features of the disclosed invention here.

1. Multi-frequency base station operating within a predetermined set of frequencies, while the components of the direct data communication line transmit simultaneously on multiple frequency bands, the base station contains the first transfer subsystem to send the message channel synchronization for single carrier frequency from a set of preferred frequency channels, and at least one additional transfer subsystem for transferring the remaining data components in a straight line on a different carrier frequency from a predefined set of frequencies, the number of frequencies in the set of preferred frequency channels less than the number of frequencies on a predefined set of frequencies.

2. The base station according to claim 1, in which the message channel synchronization defines the Central h is a frequency, at least one multi-frequency communication system in a pre-defined set of frequencies.

3. The base station according to claim 1, in which the message channel synchronization determines the frequency of the single frequency communication system in a pre-defined set of frequencies.

4. The base station according to claim 2, in which the message channel synchronization determines the frequency of the single frequency communication system in a pre-defined set of frequencies.

5. The base station according to claim 2, in which the message of the sync channel is transmitted on one of the set of preferred frequency channels, the number of frequencies in the set of preferred frequency channels less than the number of frequencies on a predefined set of frequencies.

6. The base station according to claim 5, in which the set of predefined frequencies is a set of frequency bands in a block of frequencies of the system personal communications.

7. The base station according to claim 6, in which the numbers of channels from a set of preferred frequency channels are 75, 150 and 225.

8. Multifrequency mobile station containing the control processor to control operation of the multiple subsystems of the receiver in accordance with the information specified in the accepted message channel synchronization, the first subsystem of the receiver to receive messages sync channel on the same carrier frequency, for the war is the exercise channel messages synchronization control processor and for receiving the first part of a multi-frequency signal, and at least one additional receiver subsystem for receiving additional parts of the multi-frequency signal, in which the control processor instructs the first subsystem of the receiver to tune to one frequency from a predefined set of preferred frequency.

9. The mobile station of claim 8, in which the control processor is additionally used for making decisions about the operation in single-frequency or multi-frequency mode, and, when making mobile station decision on the operation in single-frequency mode, specify the first subsystem of the receiver to tune to the frequency specified in the message channel synchronization for reception of single-sideband communication system, and in the adoption of mobile station decision on the operation in multi-frequency mode, specify the first subsystem of the receiver to tune to the first frequency, and specifying at least one additional subsystem of the receiver to tune to at least one additional frequency.

10. The mobile station of claim 8, in which the control processor instructs the first subsystem of the receiver to tune to one of a predefined set of preferred frequency.

11. The mobile station of claim 8, which operates in the set of frequencies in a personal communication system (SPS) and pre-determine the i.i.d. set of preferred frequencies consists of 75, 150 and 225 rooms of frequency channels.

12. A method of transferring data components in the direct line of communication in the communication system, which transmits the message channel synchronization for single carrier frequency from a set of preferred frequency channels frequency, and transmit the remaining components of the data on a different carrier frequency from a predefined set of frequencies, the number of frequencies in the set of preferred frequency channels less than the number of frequencies on a predefined set of frequencies.

13. The method according to item 12, on which a communication channel synchronization determines the center frequency of at least one multi-frequency communication system in a pre-defined set of frequencies.

14. The method according to item 12, on which a communication channel synchronization determines the frequency of the single frequency communication system in a pre-defined set of frequencies.

15. The method according to item 13, on which a communication channel synchronization determines the frequency of the single frequency communication system in a pre-defined set of frequencies.

16. The method according to item 13, on which a communication channel synchronization is passed through one of the set of preferred frequency channels, the number of frequencies in the set of preferred frequency channels less than the number of frequencies on a predefined set of frequencies.

17. The method according to clause 16, in which pre is varicella a specific set of frequencies is a set of frequency bands in a block of frequencies of the system personal communications.

18. The method according to 17, by which numbers of channels from a set of preferred frequency channels are 75, 150 and 225.

19. The way of reception of the data components in the direct line of communication in the communication system, which take the message of the sync channel and the first part of the multi-frequency signal on the same carrier frequency from a predefined set of preferred frequencies, manage multiple subsystems of the receiver in accordance with the information specified in the accepted message channel synchronization, and take an optional part of the multi-frequency signal on a different carrier frequency.

20. The method according to claim 19, which further make the decision to carry out the operation in single-frequency or multi-frequency mode and tune to the frequency specified in the message channel synchronization for reception of single-sideband system when deciding on the functioning of the single frequency mode, and configure at least one additional frequency, when deciding on functioning in multi-frequency mode.

21. Multi-frequency base station operating within a predetermined set of frequencies in which components of these direct lines of communication are transmitted simultaneously over multiple frequency bands containing the transmitting device for transmitting messages by the channel synchronization for single carrier frequency from a predefined set of frequencies, and transmitting device for transmitting the remaining components of the direct data communication line to another carrier frequency from a predefined set.

22. The base station according to item 21, in which the message channel synchronization determines the center frequency of at least one multi-frequency communication system in a pre-defined set of frequencies.

23. The base station according to item 21, in which the message channel synchronization determines the frequency of the single frequency communication system in a pre-defined set of frequencies.

24. The base station according to article 22, in which the message channel synchronization determines the frequency of the single frequency communication system in a pre-defined set of frequencies.

25. The base station according to article 22, in which the message channel synchronization is passed through one of the set of preferred frequency channels, the number of frequencies in the set of preferred frequency channels less than the number of frequencies on a predefined set of frequencies.

26. The base station A.25, in which a predetermined set of frequencies is a set of frequency bands in a block of frequencies of the system personal communications.

27. The base station b, in which numbers of channels from a set of preferred frequency channels are 75, 150 and 225.

28. Multifrequency mobile station containing means for controlling the Oia many subsystems of the receiver in accordance with the information defined in the accepted message carrier synchronization, the receiving device to receive the message of the sync channel on the same carrier frequency for providing a message carrier synchronization management tool, and for receiving the first part of a multi-frequency signal, and a receiving unit for receiving additional parts of the multifrequency signal.

29. Mobile station b, in which the means for controlling decides to carry out the operation in single-frequency or multi-frequency mode, and specifies the first subsystem of the receiver to tune to the frequency specified in the message channel synchronization for reception of single-sideband system, when making mobile station decision on the operation in single-frequency mode, and specifies the first subsystem of the receiver will tune to the first frequency, and specifies at least one additional subsystem of the receiver to tune to at least one additional frequency when making mobile station decision on the operation in multi-frequency mode.

30. Mobile station b, in which the means to control indicates the first subsystem of the receiver to tune to one of a predefined set of preferred frequency.

31. Mobile station b that functions in the set of frequencies of the system is Arsenalnoe communication and in which a pre-defined set of preferred frequencies consists of 75, 150 and 225 rooms of frequency channels.



 

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