Base station, user terminal and communication control method in mobile communication system

FIELD: physics, communications.

SUBSTANCE: invention relates to wireless communication. The base station is configured to communicate with a user terminal in a mobile communication system using a multiple input/multiple output (MIMO) scheme via precoding. The base station includes a receiving module which receives a precoding matrix index (PMI), which indicates a given precoding matrix, a determination module which determines the value of a flag indicator which indicates whether to use the precoding matrix given in the PMI for communication over a downlink, a control signal generating module which generates a downlink control signal which includes a flag indicator, and a transmitting module which transmits a signal, including a downlink control signal, over a downlink.

EFFECT: efficient utilisation of resources while simultaneously reducing the volume of downlink overhead.

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The technical field

The present invention generally relates to the field of mobile communications and, in particular, to a base station, a user terminal (UE) and method for managing communication in a mobile communication system that uses multiple antennas.

The level of technology

Intensive ongoing research and development of communication systems of the next generation. As communication systems of the next generation, which is the successor system W-CDMA (Wideband Code Division Multiple Access, wideband multiple access, code division multiple access) system or HSDPA (High Speed Downlink Packet Access high speed packet data transmission in the downlink), the standardization organization 3GPP (3rd Generation Partnership Project, a partnership Project 3rd generation), which is a standards body W-CDMA, is conducting research on communication systems LTE (Long Term Evolution, long-term development). More specifically, in the LTE system in the radio access system for use in the communication system in the descending line, and the communication system in the ascending line are investigated respectively OFDM (Orthogonal Frequency Division Multiplexing, multiplexing orthogonal frequency division) and the scheme of SC-FDMA (multiple access frequency division on the same carrier) (see, for example, non-patent document 1).

The OFDM scheme is a scheme with a lot of bearing to the second frequency band is divided into multiple subcarriers, with a narrower bandwidth, and to transfer the data displayed on these subcarriers. By using the orthogonality of subcarriers (i.e. independence from each other) subcarriers may partially overlap each other on the axis of frequency, thereby providing improved efficiency of use of frequencies and increasing the transmission rate.

Scheme SC-FDMA is a schema with a single carrier, in which the frequency band is divided into a number of narrower frequency bands that are allocated to multiple user terminal (UE, user equipment, user devices (mobile stations), so that the user terminal (UE) can transmit in different frequency bands, thereby reducing the interference between user terminals (UE). In addition, in the scheme of SC-FDMA can be reduced to the range of fluctuation of the transmission power and thereby can be reduced power consumption by the terminal user, and to provide a wider coverage area.

As the implementation of transmission in the uplink communication and the implementation of the transfer in the downlink in LTE system, the communication is carried out by allocating one or more physical channels are shared by many user terminal (UE). The channel is shared by many of those who minals user (UE), in General called a shared channel (shared channel). In the system of the LTE connection in the uplink communication and communication in the downlink is performed using, respectively, rising physical shared channel (PUSCH, Physical Uplink Shared Channel) and a physical downstream shared channel (PDSCH, Physical Downlink Shared Channel).

In the communication system using a shared channel, as described above, it is necessary to carry out the alarm (alarm or alert) to determine the total channel is subject to selection what exactly the user terminal (UE) in respect of each podagra (having in the LTE system duration equal to one (1) MS). The control channel (control channel)used for signaling in the LTE system, called physical downward control channel (PDCCH, a Physical Downlink Control Channel) or a downward control channel L1/L2 (DL L1/L2 (Level 1/Level 2, level 1/level 2) control channel). Next, data to be reported for physical downward control channel (PDCCH), include, for example, top-down planning, information confirm/confirm (ACK/NACK), a grant from the rising of the planning (uplink scheduling grant), overload indicator, bit control commands transmission power and the like (see, for example, non-patent document 2).

Information top-down planning and grant ascending planning include the information element is s, be used to signal that determines which shared channel to be allocated and what the user terminal (UE). In addition, the information top-down planning may include information elements related to a physical descendent shared channel (PDSCH), for example, information allocating downlink resource blocks, the ID of the user terminal (UE) (mobile station), the number of threads when the communication scheme MIMO (Multi-Input Multi-Output system with many inputs and outputs), the information matrix pre-coding, data size, modulation scheme, information HARQ (Hybrid Automatic Repeat reQuest, hybrid automatic request retransmission), etc. in Addition, the grant of the rising planning can to include information elements related to rising physical shared channel (PUSCH), such as information selection ascending blocks resource identifier (ID) of the user terminal (UE), a data size, modulation scheme, information on the capacity of the upward transmission information reference signal demodulation in the ascending MIMO scheme, etc.

In the communication scheme MIMO (Multi-Input Multi-Output system with many inputs-outputs) uses multiple antennas to increase data rate and/or improve the quality of communication. Furthermore, in the MIMO communication scheme transmitted signal is opiraetsya, and each signal is combined with suitable weighting factor and transmitted. This makes it possible to transmit signals as managed rays with a certain orientation. This method is called the method of pre-coding and weighting factor (or factor "weighing"), used in this way is called a matrix pre-encoding.

1 shows a diagram in which pre-coding. As shown in figure 1, every two (2) flow (transmitted signals 1 and 2) are copied to retrieve two (2) signals, so that these two (2) signal pass through two different systems (paths). In each system (tract) signal is multiplied by the matrix pre-coding (combined with a matrix of pre-coding), and is transmitted combined signal. To use a more suitable matrix pre-coding (or set of vectors pre-coding) pre-coding is performed on a system with a closed loop, as shown in figure 1. When using closed-loop matrix pre-coding (or set of vectors pre-coding) can adaptively be adjusted to be more suitable value, on the basis of information education is Noah communication matrix pre-coding from the receiving side (user terminal (UE)). In the method of pre-encoding each stream is transmitted with spatial separation, therefore, may have a more significant improvement in quality for each stream.

Non-patent document 1: 3GPP TR 25.814 (V7.0.0), "Physical Layer Aspects for Evolved UTRA," June 2006.

Non-patent document 2: 3GPP R1-070103, "Downlink L1/L2 Control Signaling Channel Structure: Coding".

In order to properly demodulate the shared data channel (shared channel), which applies pre-coding, it is necessary to accurately perform channel compensation for the shared data channel. In one of the ways the exact perform channel compensation in addition to the General channel, which is used for pre-coding, provides the reference signal for which also applies pre-coding. Probably, the presence of such a reference signal can accurately estimate the channel. However, for transmission of the reference signal requires considerable amount of resources that can increase service information (overhead). Therefore, from the viewpoint of increasing the capacity of the system, this method may not be preferred.

To solve, we can assume that there is a common reference signal which is common to all of the user terminal (UE), so that the channel compensation can be performed is based on a common reference signal. When using this method requires that the user terminal (UE) transmitted data, which indicates that pre-coding (matrix pre-coding is applied (used) for the shared data channel. Next, to simplify the description of such data is referred to as the indicator matrix pre-coding (PMI Pre-coding Matrix Indicator).

Figure 2 shows a diagram of one of the modes of transmission of the indicator matrix pre-coding (PMI). As shown in figure 2, in this way downward together with the physical shared channel (PDSCH), applies pre-coding is always transmitted PMI indicating the matrix pre-coding, which is used for physical downstream shared channel (PDSCH). In the case shown in figure 2, PMI indicating the matrix pre-coding is transmitted back from the user terminal (UE) to the base station eNB (hereinafter called "the return of PMI"). Base station eNB transmits a physical downlink shared channel (PDSCH), together with the PMI indicating the matrix pre-coding assigned (selected) by the user terminal (UE)or other matrix pre-coding. In accordance with this method, you can provide the possibility that the base station eNB will have the right to determine PMI, indicating that mA is ritsu pre-encoding, which is most suitable for transmission status. This ensures more efficient use of downlink resources. For example, when the downward transfer can be normally performed using only two (2) threads, even if the user terminal (UE) transmits the PMI indicating the matrix pre-coding using four (4) flow, the base station eNB may decide to use a matrix of pre-coding (the set of vectors pre-coding), using two (2) flow, without the use of matrix pre-coding using four (4) stream transmitted from the user terminal (UE). In this case, due to the implementation of the matrix pre-coding, a specific base station eNB, it is possible to properly and effectively use top-down resources. However, because in this way it is always necessary to transmit in the downlink PMI may therefore increase the amount of service information. In addition, the amount of data occupied by PMI, may increase or decrease depending on the number multiplexing user (user terminal (UE)) in the downlink, which can be difficult blind detection (blind detection).

Figure 3 p the cauldron scheme other way message to a user terminal (UE) matrix pre-encoding, be used when transmitting from the base station eNB. In this case, the base station eNB must use PMI returned from the user terminal (UE) to the base station eNB (returned PMI). In this case, to reduce the amount of overhead this method may be preferable, so as to betray PMI downward together with the physical shared channel (PDSCH) is not required. However, when using this method, the base station eNB can not replace the matrix pre-coding on a more suitable one. Therefore, this method is not preferred from the viewpoint of effective use of downstream resources. In addition, if the base station eNB fails to properly recognize the return of PMI, the base station eNB may perform pre-coding using matrix pre-coding that is different from the matrix, the intended user terminal (UE). In addition, in this case, since the user terminal (UE) does not know what the base station eNB failed to correctly recognize the return of PMI, the user terminal (UE) will have to process the received signal with low quality.

Disclosure of inventions

In accordance with the embodiment of the present invention proposes a mobile communication system using the MIMO scheme, in which the volume of the descending overhead can be reduced and can be effective using radioresource.

According to the aspect of the present invention offers a base station configured to communicate with a user terminal in a mobile communication system that uses a circuit with many inputs-outputs (MIMO multi-input multi-output), using a pre-coding. The base station includes a receiving module, receiving the indicator matrix pre-coding (PMI Pre-coding Matrix Indicator)indicating the specified matrix pre-coding determining module that determines the value of the indicator flag that specifies whether to use matrix a preliminary encoding specified in the PMI for communication in downlink; module generating a control signal, generating a downward control signal including at least an indicator flag; and a transmitting module that transmits a signal including downlink control signal in downlink.

In accordance with the implementation of the present invention proposes a mobile communication system using the MIMO scheme, in which the volume of the descending overhead can be reduced and can be effective using radioresource.

Brief description of drawings

Figure 1 is a diagram that shows the preliminary encoding.

Fig. represents the schema which shows the problem that occurs in the traditional way.

Figure 3 is a diagram that shows the problem in another traditional method.

Figure 4 is a diagram that shows the implementation of pre-coding on the basis of the method used by the base station (eNB) and user terminal (UE)in accordance with the embodiment of the present invention.

Figure 5 is a block diagram showing an example of operation of the user terminal (UE) in accordance with the embodiment of the present invention.

6 is a block diagram showing an example of a base station (eNB) according to the embodiment of the present invention.

Fig.7 is a diagram that shows the calculation of the bit detection error when the value of the indicator flag is equal to one (1).

Fig is a diagram that shows the calculation of the bit detection errors and the element of channel coding, when the value of the indicator flag is equal to zero (0).

Fig.9 is a diagram that shows the calculation of the bit detection errors, including the case when a parcel is returned PMI (indicator matrix pre-coding) bits of the control.

IG is a functional diagram, which shows an example structure of a base station eNB according to the embodiment of the present invention.

11 is a functional diagram showing an example structure of a user terminal (UE) in accordance with the embodiment of the present invention.

The list of signs:

102: module radio

104: module demodulation of the rising signal

106: module decoding the data signal

108: module decoding bits control

110: module determining reliability of the PMI

112: module selection matrix pre-coding

114: module add a bit detection error

116: module remove PMI

118: module channel coding

120: module modulation bits control

122: module serial-to-parallel conversion

124: module channel coding

126: module data modulation

128: module multiplication matrix pre-coding

130: module multiplexing signal

132: module inverse fast Fourier transform (IFFT, OBPF)

134: module radio

202: module coding and modulation data signal

204: module coding and modulation control signal

206: module generating the rising of the signal being transmitted

208: module broadcasts the

210: module radio

212: the modulus of the fast Fourier transform (FFT, FFT)

214: module selection matrix pre-coding

216: storage modulus PMI

218: module demodulation data

220: module channel decoding

222: adding PMI

224: module detection error

230: the module multiplication matrix pre-coding

232: module signal separation

234: module decoding channel

236: module parallel-serial conversion

The implementation of the invention

Figure 4 shows the communication scheme to be carried out between the base station eNB and the user terminal (UE) in accordance with the embodiment of the present invention. When the first communication from a user terminal (UE) to the base station eNB returns the indicator matrix pre-coding (PMI)indicating a given matrix pre-coding. Base station eNB determines whether or not the matrix a preliminary encoding specified in the PMI should be used when performing communication in the downlink, and prepares the indicator flag indicating the result of this determination. Then the base station eNB transmits a physical downlink shared channel (PDSCH) together with prepared by indicator flag in the user terminal (UE). terminal user (UE) receives the indicator flag and determines whether or not the matrix is pre-coding previously returned to the base station eNB is used for communication in the downlink, by checking the received indicator flag. For example, the value of the indicator flag can be expressed by means of one (1) bits. In this case, when the bit value is "0" (zero), when carrying out communication in the downlink using a matrix pre-encoding specified in the PMI. On the other hand, when the bit value is "1" (one), use the default matrix pre-coding, previously known as the base station eNB and the user terminal (UE). In General, the number of bits representing the indicator flag that is smaller than the number of bits representing PMI, so when using the indicator flag the overhead can be significantly reduced compared with the case where PMI is transmitted during each downward transmission, as in the traditional way. In addition, the base station eNB may select a suitable matrix pre-coding that is different from the matrix prior to the encoding specified in the returned PMI from the user terminal (UE), so as to effectively use downstream resources.

However, you may encounter a case in which the matrix pre-code the simulation, used base station eNB in the communication in the downlink, different from the matrix prior to the encoding specified by the user terminal (UE) based on the indicator flag received from the base station eNB. This problem may occur when, for example, the base station eNB is not able to successfully take the correct PMI and she recognizes erroneous PMI. As a result, when communication in the downlink is used erroneous matrix pre-coding specified erroneous PMI, if the user terminal (UE) is unable to make the right indicator flag and he recognizes erroneous indicator flag, etc. In such cases, if the user terminal (UE) performs the operation "weighing" and subsequent operations on the received signal from the base station eNB using a matrix pre-coding available in the user terminal (UE)with a waste of resources can be extracted (received) signals are very poor quality. To prevent this problem, the user terminal (UE) may preferably determine the correct data transmitted from the base station eNB.

In accordance with the embodiment of the present invention base station eNB performs channel coding (encoding) by processing part of the data in which the quality of the encoding element, moreover, the portion of the data includes control bits, the indicator flag (bit(s) of the indicator flag) and bit detection errors. Bits of detection errors are obtained (calculated) by performing a predetermined calculation on the object of calculation, including at least control bits and the indicator flag (bit(s) of the indicator flag). In addition, when the indicator flag (bit(s) of the indicator flag) is the specified value, PMI is included in the object of calculation, and, conversely, when the indicator flag (bit(s) of the indicator flag) is another preset value, PMI is not included in the object of calculation. On the other hand, the user terminal (UE) also obtains (calculates) the bits of the detection of errors by performing predetermined calculations on the object of calculation, including control bits, the indicator flag (bit(s) of the indicator flag) and, if necessary, PMI. Then the bits of the detection errors, provided (calculated) base station eNB, are compared with the bits of the detection errors, provided (calculated) by the user terminal (UE). This makes it possible to determine whether the matrix is pre-coding provided by the user terminal (UE) based on the indicator flag is used when performing communication in the downlink.

The number of bits of indicator flag is less than the number of bits of the PMI, therefore, the provision of a sufficiently large capacity of the error correction can be difficult, if to obtain (calculate) bits for detecting errors in the object calculations included only the indicator flag (bit(s) of the indicator flag). To solve this problem, as described above, in accordance with the embodiment of the present invention jointly encoded not only the indicator flag (bit(s) of the indicator flag), but also control bits and bits of detection errors. This makes it possible to provide greater coding efficiency compared with the case where encoded only indicator flag (bit(s) of the indicator flag).

The number of bits of indicator flag is not limited to a specific value, but may not be less than (1). When the matrix prior to the encoding specified in the PMI is not to be used for communication in the downlink, for this purpose, as a matrix pre-coding can be used, the default matrix pre-coding, previously known as the base station eNB and the user terminal (UE). When determining this for communication in downlink always used the default matrix pre-coding, when the matrix prior to the encoding specified in the PMI, in the barely not used. Therefore, by checking the values of the indicator flag (bit (bits) indicator flag), with a smaller number of bits than the number of bits of the PMI, you can set the matrix pre-coding, which is actually used for communication in the downlink.

When the value of the indicator flag (bit (bits) indicator flag) indicates that the default matrix pre-coding is not used for communication in the downlink (hereinafter, this case can also be called a case of "X=0"), the part data including data which convolution PMI bits control the indicator flag (bit(s) of the indicator flag) and bit detection errors can be encoded (to be subjected to channel coding) and transmitted to the user terminal (UE). This may be preferable from the point of view of the transmission PMI in the user terminal (UE) without increasing the number of bits of the control. However, in this case you should pass the user terminal (UE) data indicating the number of bits occupied by the PMI (collapsed with PMI).

In accordance with the embodiment of the present invention base station eNB may perform an operation of detecting errors on PMI, which is returned from the user terminal (UE) (hereinafter also called "returns the text of PMI"). This operation may be preferable from the viewpoint of reliably determining whether to use the default matrix pre-coding for communication in the downlink. In addition, for example, the user terminal (UE) receives as PMI and bits of detecting errors PMI, and performs the operation of detecting errors on PMI on the basis of comparison bits detection of errors calculated by the user terminal (UE), and bit detection errors, the computed base station eNB. In addition, the base station eNB may perform an operation of detecting errors based on the level of quality of reception of the rising of the reference signal received from the user terminal (UE). In addition, the base station eNB may perform an operation of detecting errors based on the plausibility of the common channel data received from the user terminal (UE).

Next, with reference to the accompanying graphic materials described variant of implementation of the present invention. In the embodiment, as examples can be used in some specific value. However, these values are given only for description, and unless otherwise specified, can be any other suitable value.

The first option exercise

Functioning up to the beginning of the and communication in the downlink

The following describes the operation of the base station eNB and a user terminal (UE) in a mobile communication system in accordance with the embodiment of the present invention. In the mobile communication system, it is assumed that, when the pre-coding, the link is a schema-based MIMO (Multi-Input Multi-Output). Therefore, as the base station eNB and the user terminal (UE) have multiple transmit-receive antennas, and applies a weighting based on the matrices pre-coding, so that the signals transmitted from the antennas in the required fields.

5 and 6 are diagrams showing examples of operations performed respectively by the user terminal (UE) and base station eNB, in accordance with the embodiment of the present invention. In the example operations shown in figure 5 and 6, is adaptive management selection matrix pre-coding based on PMI returned from the user terminal (UE) to the base station eNB (i.e. returned PMI). As shown in figure 5, in step S502, the user terminal (UE) determines the PMI, which should be returned to the base station eNB (i.e. returned PMI). Typically, the matrix is pre-encoding specified in the PMI is one of a predetermined number of matrices preliminary codero the project (U 1U2, ..., UP). More specifically, PMI defines a matrix of pre-coding (Uifrom the number of matrices pre-coding (U1U2, ..., UP). In the more General case of a matrix pre-coding are not a group of alternatives is adaptive and can be configured so that may be formed from any suitable matrix pre-coding. However, from the viewpoint of reducing the computational load to control the selection matrix pre-coding and providing adaptive control matrix pre-coding preferably can be selected from a group of alternatives.

Next, in step S504, the user terminal (UE) transmits to the base station eNB the determined PMI.

Next it moves on to the step S602 shown in Fig.6. In step S602, the base station eNB receives PMI (returned PMI) from the user terminal (UE).

In step S604, the base station eNB determines a matrix of pre-encoding, defined in PMI, and additionally determines whether the matrix prior encoding specified in the PMI, for use in communication in the downlink. In this case, the base station eNB may determine whether the matrix is pre-coding on the basis of the number of threads, the number is TBA transmitting antennas, volume downward graphics, etc. In this embodiment, when it is determined that the matrix prior to the encoding specified in the PMI is not suitable for communication in downlink, as a matrix pre-coding, which should be used for communication in downlink is selected, the default matrix pre-coding, previously known as the base station eNB and the user terminal (UE). There may be more than one default matrix pre-coding, however, to simplify this description assumes that there is only one default matrix pre-coding. More specifically, in this embodiment, there are two alternatives for choice of matrix pre-coding. One alternative is a selection matrix preliminary encoding specified in the PMI, and the other alternative is a choice of the default matrix pre-coding. In addition, in this embodiment, the indicator flag is defined by one (1) bits to determine which of the matrices pre-coding is chosen as a matrix pre-coding to be used for the sushestvennee communication in the downlink. Therefore, in this case, depending on the value of the bit indicator flag (for example, equal to "1" or "0") to be used is selected, the default matrix pre-coding or matrix prior encoding specified in the PMI. If there are multiple default matrices pre-coding for expression of the desired number of values of the indicator flag can be used multiple bits of the indicator flag. In this case, in the presence of, for example, three (3) types of default matrices pre-coding for transmission of data indicating which type of matrix pre-coding should be used for communication in the downlink, can be used two (2) bits of the indicator flag.

In step S604, when it is determined that as a matrix pre-coding, which should be used for communication in the downlink, selected the default matrix pre-coding transitions to step S606. In step S606 bits are calculated intensity errors with the assumption that communication in the downlink should be used, the default matrix pre-encoding.

7 shows the scheme to obtain (calculate) bits de the design of error, when communication in the downlink should be used, the default matrix pre-coding. As shown in Fig.7, the bits of the detection errors are obtained (calculated) by performing predetermined calculations on data bits (object computing), including control bits (control data) and the value of the bit indicator flag (whose value is "1" in example 7). Generally, as the bit detection errors can be used bits of detection used for checking cyclic redundancy check (CRC, Cyclic Redundancy Check (i.e. bits of detecting CRC errors). In another embodiment, may be any other suitable detection bits. In this embodiment, as shown in Fig.7, is convolution user identifier (UE-ID) bits for detecting errors used to detect errors (CRC). In addition, the control bits include various information items to be transferred to the user terminal (UE) for communication in the downlink. These information elements typically include data included in the control channel L1/L2 (L1/L2 CCH), however, in another embodiment, the information elements may include only a portion of the data included in the control channel L1/L2 (L1/L2 CCH), eridania, other than the data included in the control channel L1/L2 (L1/L2 CCH). In any case, in step S606 control bits as part of the calculation object bit detection errors include any data other than the indicator flag and PMI.

Next, in step S608 shown in Fig.6, the operation is performed coding (channel coding) for error correction. As the encoding method may be used any suitable known in the art, the encoding method including convolutional coding, turbo coding, etc. In this step of this variant of implementation, the coding is performed by processing the data bits (pieces of data), including control bits, bit indicator flag (indicating a value of "1"and bits of detecting errors as part of the encoding.

On the other hand, in step S604, when it is determined that as a matrix pre-coding, which should be used for communication in the downlink, the selected matrix preliminary encoding specified in the PMI transitions to step S610. In step S610 bits are calculated intensity error in the assumption that for communication in the downlink should be used in the matrix prior to the encoding specified in the PMI.

On Fig shows a schematic obtain(calculate) bit detection errors, when communication in the downlink should be used in the matrix prior to the encoding specified in the PMI. As shown in Fig, bits of detection errors are obtained (calculated) by performing predetermined calculations on data bits (object computing), including control bits (control data), the bit value of the indicator flag (whose value is "0" in the example on Fig) and PMI returned from the user terminal (UE) (i.e., returned PMI). Generally, as the bit detection errors can be used bits of detection used for checking cyclic redundancy check (CRC, Cyclic Redundancy Check). In another embodiment, may be any other suitable detection bits. In this embodiment, as shown in Fig, performs convolution user identifier (UE-ID) bits for detecting errors used to detect errors (CRC). It should be noted that unlike the case shown in Fig.7, Fig shown that the return PMI included in the object of calculation used to obtain (calculate) bit detection errors. As described above, the control bits include various information items to be transferred to the user terminal (UE) for communication in the downlink. The data and the structural elements, as a rule, include the data included in the control channel L1/L2 (L1/L2 CCH), however, in another embodiment, the information elements may include only a portion of the data included in the control channel L1/L2 (L1/L2 CCH), or data other than the data included in the control channel L1/L2 (L1/L2 CCH).

Next, in step S612 shown in Fig.6, the operation is performed coding (channel coding) for error correction. As the encoding method may be used any suitable known in the art, the encoding method including convolutional coding, turbo coding, etc. In this step of this variant of implementation, the coding is performed by processing the data bits (pieces of data), including control bits, bit indicator flag (indicating a value of "0"and bits of detecting errors as part of the encoding.

In step S612, as shown in Fig returned PMI is not included in the encoding element. More specifically, in the result returned PMI is included in the object of calculation used to obtain (calculate) bits to detect errors, but not included in the object to be coding (channel coding). In addition, the encoding operation in step S608 and S610 data bits (data part), including control bits, bit indicator flag bits for detecting errors are treated as the encoding element, therefore, the coded data, the last encoding, respectively, at step S608 and S610 are essentially the same size.

In step S614, shown in Fig.6, the signal comprising encrypted (subjected to channel coding) of the data is properly transmitted in downlink. In the diagram shown in Fig.6, the General operation of the signal processing designed to generate the downward transmitted signal, is omitted for simplification. In this case, in addition to the physical top-down control channel (PDCCH) transmitted signal may include such signals as the physical downlink shared channel (PDSCH) and the reference signal. Signal processing may include, for example, the modulation data (for example, QPSK and 16 QAM), performing weighting for preliminary coding, inverse fast Fourier transform (IFFT, OBPF), adding a guard interval, d / a conversion, limiting bandwidth, increased power, etc.

In addition, in step S602 base station eNB may further determine that the correct accepted the return of PMI. In this case, for example, when receiving from the user terminal (UE) is not only the return of PMI, but also bits of detecting errors returned PMI base station eNB can determine the correct accepted returned PMI, on the basis adopted by itov detection errors. In addition, the base station eNB can determine the correct accepted returned PMI, on the basis of the received information about the quality (for example, a received signal is the sum of interference and noise ratio, SINR, signal-to-interference and noise ratio) accept the rising of the reference signal from the user terminal (UE). In addition, when receiving a rising shared channel (UL-SCH) base station eNB can determine the correct accepted returned PMI, based on the likelihood obtained as a result of decode of the rising shared channel (UL-SCH). In addition, the base station eNB can determine the correct accepted returned PMI, based on the likelihood obtained as a result of decoding of the received return of PMI. These methods can be used separately or in combination.

In addition, as shown in Fig.9, to perform coding (channel coding) in step S612 can be performed convolution data indicating PMI (returned PMI), with bits of control. Because of this transmission in the downlink data indicating PMI (returned PMI)is not required to increase the number of bits of the signals. However, you need some way to pass in the user terminal (UE) data indicating which bits from among the bits of the control ispolzovaniya convolution returned PMI bits of the control.

The operation after the start of communication in the downlink.

As shown in figure 5, in step S506, the user terminal (UE) receives from the base station eNB physical downlink shared channel (PDSCH) (transmitted in the downlink). In the diagram shown in figure 5, the overall operation of the signal processing designed to generate the downward transmitted signal, is omitted for simplification. In this case, in addition to the physical top-down control channel (PDCCH) signal may include such signals as the physical downlink shared channel (PDSCH) and the reference signal. Signal processing may include, for example, power amplification, limiting the bandwidth of the analog-to-digital conversion, removing the guard interval, the fast Fourier transform (FFT, FFT), etc.

Next, in step S508 data bits (data part), adopted in the physical downlink shared channel (PDSCH) (accepted signal) in step S506, decode (pass channel decoding). As described in steps S608 and S610 shown in Fig.6, bits of information (some information), including control bits, bit indicator flag bits and detection errors are processed as part of the encoding. After decoding (channel decoding) is checked (it turns out) the value of "X" bits of the indicator flag. When it is determined that X=1, transitions to step S510, and, on the contrary, when it is determined that X=0 transitions to step S512.

In step S510, when X=1, bits are calculated detection errors. When the transition is performed in step S510, as a matrix pre-coding, which should be used for communication in downlink is selected, the default matrix pre-coding. Therefore, in the base station eNB bits detection errors are obtained (calculated) in step S606 figure 6 as shown in Fig.7. Therefore, in this step S510 also obtained (calculated) bits of detecting errors by performing predetermined calculations on data bits (object computing), including control bits (control data) and the value of the bit indicator flag (value "1").

On the other hand, in step S512, when X=0, bits are calculated detection errors. When it moves on to the step S512, as a matrix pre-coding, which should be used for communication in downlink is selected matrix preliminary encoding specified in the PMI. Therefore, in the base station eNB bits detection error obtained (calculated) in step S610 figure 6, as shown in Fig. Therefore, in step S512 also obtained (calculated)bits of detecting errors by performing predetermined calculations on data bits (object computing), includes control bits (control data), the bit value of the indicator flag (whose value is "0") and PMI returned from the user terminal (UE) (i.e., returned PMI). Returned PMI is the same as that returned PMI transmitted from the user terminal (UE) to the base station eNB in step S504. So the returned PMI already known to the user terminal (UE), when, for example, returned PMI is stored in the buffer of the user terminal (UE).

Next, in step S514, the user terminal (UE) compares the bits of the detection of errors received (computed) in the base station eNB, with bits of detecting errors received (computed) in the user terminal (UE), with the purpose of detecting errors. When performing the comparison for the detection of errors, when it is determined that the bits of the detection of errors received (computed) in the base station eNB, identical to the bits of the detection of errors received (computed) in the user terminal (UE), user terminal (UE) can correctly identify that the matrix pre-coding used for communication in the downlink is the default matrix prior coding or matrix prior encoding specified in the PMI.

Next, in step S516 can be accurately performed compensation channel and demodu Asia physical downstream shared channel (PDSCH) based on the correct matrix pre-encoding, confirmed at step S514.

In accordance with this embodiment of the present invention, when the base station eNB is not able to successfully take the correct PMI or when the user terminal (UE) cannot be received from the base station eNB correct data (signal), the user terminal may receive a negative result in the comparison of the error detection (step S514). On the basis of the comparison result of the error detection of the user terminal (UE) may immediately discard the received data related to incorrect matrix pre-coding, or save the received data with a lower likelihood for the preparation of the subsequent combining of packages. In accordance with this embodiment of the present invention can be used to detect the difference of the recognition belonging to the matrix prior to the encoding that should be used for communication in the downlink between the base station eNB and the user terminal (UE).

The design of the base station eNB.

Figure 10 is a functional diagram of the base station eNB according to the embodiment of the present invention. As shown in figure 10, the base station eNB includes a module 102 of the radio module 104 demodulation of the rising of the received signal is La, module 106 decoding a data signal, the decoding module 108 bits control module 110 to determine the validity of PMI module 112 selection matrix pre-coding module 114 add a bit detection error, the module 116 remove PMI module 118 channel decoding module 120 modulation bits control module 122 series-parallel conversion module 124 of channel coding, module 126 data modulation module 128 multiplication matrix pre-encoding module 130 multiplexing signal, the module 132 inverse fast Fourier transform (OBPF, IFFT) module 134 radio.

The module 102 performs radio signal processing so that converts the signals received by multiple antennas from #1 to #M, into digital signals baseband frequencies. Signal processing may include, for example, power amplification, limiting the bandwidth of the analog-to-digital conversion, etc.

The module 104 demodulation of the rising of the received signal properly separates the received signals, transmitted in the ascending line of communication, and these signals include a physical uplink shared channel (PUSCH), the control channel (for example, the control channel L1/L2 (L1/L2 CCH)), the reference signal, etc. in Addition, the module 104 demodulation of the rising of the received signal, performs an assessment of the channel, measured the e quality of a received signal, etc. As a quality measurement of the received signal can be performed, for example, the measurement signal is the sum of interference and noise ratio (SINR, Signal-to-Interference and Noise power Ratio).

Module 106 decoding data signal divides the received signal, transmitted by the transmit antennas of one or more streams, and decodes each stream. Performs decoding corresponding to the encoding performed by the transmitting device. When decoding receive data credibility, and performs error correction.

The decoding module 108 bits control decodes the control channel and retrieves the data included in the control channel L1/L2 (L1/L2 CCH). In accordance with the embodiment of the present invention, the decoding module 108 bits control retrieves PMI and sets the matrix pre-coding, transmitted from the user terminal (UE). When you receive not only PMI (returned PMI), but also bits of detection errors (usually bits of detecting CRC error) indicator matrix pre-coding (PMI) module 108 decoding bits control can perform the operation of detecting errors with respect to the PMI and output a result of detection errors.

The module 110 to determine the validity of PMI determines the correct PMI returned from the user terminal (UE) (i.e., in suremy PMI). To do this, when you receive not only PMI (returned PMI), but also bits of detecting errors PMI module 110 to determine the validity of PMI can determine the correct return PMI, using bits of detection errors. In addition, the module 110 to determine the validity of PMI can determine the correct return PMI, based on the information about the reception quality (for example, adopted SINR) received the rising of the reference signal from the user terminal (UE). In addition, the module 110 to determine the validity of PMI can determine the correct return PMI, based on the likelihood obtained by decoding the received rising shared channel (UL-SCH). In addition, the module 110 to determine the validity of PMI can determine the correct return PMI, based on the likelihood obtained by decoding the received return of PMI. Figure 10 shows that there are all of the above bits of decoding errors, information about the quality of reception and data credibility. However, it can be used only one indicator of the number of bits for detecting errors, information about the quality of reception and data about the plausibility or any combination thereof.

Module 112 selection matrix pre-coding selects (determines) the matrix pre-coding, which should the be used for communication in the downlink, on the basis of the result of the determination performed by the module 110 to determine the validity of PMI, and the specified criteria (element), such as the required number of threads for communication in the downlink, the number of transmitting antennas, the amount of downward graphics, etc. for Example, when returned PMI received correctly, as a matrix pre-coding, which should be used for communication in the downlink, can be used in the matrix prior to the encoding specified in the PMI. On the other hand, if the returned PMI adopted correctly, using the matrix prior encoding specified in the PMI may be inappropriate. In this case, you may use the default matrix pre-coding, previously known as the base station eNB and the user terminal (UE)in Addition, even when the returned PMI received correctly, on the basis of the actually required amount of downstream traffic can use any matrix pre-coding that differs from that defined in PMI. In addition, the module 112 selection matrix pre-coding provides (generates) the indicator flag indicating, for example, whether the selected matrix preliminary encoding specified in the PMI (returned PMI), as the matrix p is adveritising encoding, you want to use for communication in downlink (X=0), or as a matrix pre-coding, which should be used for communication in the downlink, selected the default matrix pre-coding (X=1), and transmits the generated indicator flag module 114 add a bit detection error. When X=0, returned PMI is also passed to the module 114 add a bit detection error.

Module 114 add a bit detection error obtains (calculates) the bits of the detection of errors (usually bits of detecting CRC errors) by performing predetermined calculations on data bits (data part), including control bits (control data), the bit indicator flag (for example, specifying a value of "0" or "1") and, if necessary, returned PMI.

Module 116 remove PMI removes returned PMI, when returned PMI included in the object of calculation used to obtain (calculate) bit detection errors, and regardless of the values of the indicator flag provides part of the data, including control bits, the indicator flag (bit(s) of the indicator flag) and bit detection errors.

Module 118 performs channel coding channel coding by processing part of the data as part of the anal encoding (encoding) to generate a signal, the last channel encoding.

The module 120 modulation bits control performs the modulation of the data signal, the last channel encoding.

The module 122 series-parallel conversion converts a serial signal to be transferred with the use of physical downstream shared channel (PDSCH), in several parallel threads.

The module 124 performs channel coding channel coding for each stream to generate flows past channel encoding.

The module 126 performs data modulation modulation data streams, past channel encoding.

Module 128 multiplication matrix pre-coding performs weighting on each of the threads based on the matrix pre-coding, and the matrix pre-coding is selected (determined) module 112 selection matrix pre-encoding.

The module 130 multiplexing signal multiplexes the control channel physical downlink shared channel (PDSCH) and other channels.

Module 132 inverse fast Fourier transform (OBPF, IFFT) performs inverse fast Fourier transform of each of the multiplexed streams for modulation OFDM.

The module 134 performs radio broadcast streams with what ispolzovaniem multiple transmitting antennas. Here, the operations can include adding a guard interval, d / a conversion, limiting bandwidth, increased power, etc.

The design of the user terminal (UE).

11 is a functional diagram of a user terminal (UE) in accordance with the embodiment of the present invention. As shown in figure 11, the user terminal (UE) includes a module 202 coding and modulation data signal, the module 204 encoding and modulation control signal, the module 206 of the rising generation of the transmitted signal, the module 208 to the radio module 210 radio module 212 of the fast Fourier transform (FFT)module 214 selection matrix pre-coding module 216 accumulation PMI module 218 demodulation data module 220 channel decoding module 222 adding PMI module 224 of the detection errors, the module 230 multiplication matrix pre-encoding module 232 signal separation module 234 decoding channel and module 236 parallel-serial conversion.

Module 202 coding and modulation data signal performs channel coding and modulation data in relation to rising physical shared channel (PUSCH).

Module 204 encoding and modulation control signal performs channel coding and modulation data in the walking the control channel L1/L2 (UL L1/L2 control channel).

The module 206 to generate the rising of the signal being transmitted properly performs the mapping of the control channel and the shared channel to provide (get output) transmission threads. In this case, on each of the threads performs operations such as discrete Fourier transform (DFT, DFT) operation display in the frequency domain and inverse fast Fourier transform (OBPF, IFFT).

Module 208 radio performs conversion operations-flows in the main band of frequencies in the signal to be broadcast by using multiple transmitting antennas. These operations may include digital to analog conversion, limiting bandwidth, increased power, etc.

Unlike module 208 of the radio module 210 to the radio performs conversion of the radio signals received multiple receiving antennas, flows in the primary frequency band. These operations may include power amplification, limiting the bandwidth of the analog-to-digital conversion, etc. in respect of each of the threads.

Module 212 of the fast Fourier transform (FFT) fast Fourier transform of each of the threads for OFDM demodulation.

Module 214 selection matrix pre-selects the encoding matrix pre-coding, suitable for communication in either the walking line on the basis of the level of quality of reception of the reference signal in a received signal from the base station eNB and issues PMI indicating the selected matrix pre-coding. Typically, the matrix is pre-coding is one of a specified number of matrices pre-coding (U1U2, ..., UP). More specifically, PMI defines a matrix of pre-coding (Uifrom the number of matrices pre-coding (U1U2, ..., UP). In General, matrix pre-coding are not a group of alternatives is adaptive and can be configured so that may be formed from any suitable matrix pre-encoding.

Module 216 accumulation PMI PMI retains for a certain time, and the PMI determined by module 214 selection matrix pre-encoding.

Module 218 demodulator demodulates the data portion of the data in a received signal.

Module 220 channel decoding performs channel decoding (decoding) by processing part of the data as part of channel decoding, and a portion of the data includes control bits, the indicator flag (bit(s) of the indicator flag) and bit detection errors (usually bits of CRC detection). Item channel decoding corresponds to the element Kadirova the Oia, performed on the transmission side. In the channel decoding (decoding) is determined by the value of "X" indicator flag.

When the value of the indicator flag is given a value from module 216 accumulation PMI (in the above example, when X=0), the module 222 adding PMI remove PMI to calculate the bit detection error, and prior to that PMI is transmitted to the base station eNB. In this case, the bits of the detection of errors (usually bits of detecting CRC errors) can be obtained (calculated) by performing predetermined calculations on data bits (data part), including control bits (control data), the bit indicator flag (indicating a value of "0"), and granted to PMI. On the other hand, when the value of the indicator flag is different (in the above example, when X=1), bits of detection errors are obtained (calculated) without providing (using) any PMI. More specifically, the bits of the detection of errors (usually bits of detecting CRC errors) can be obtained (calculated) by performing predetermined calculations on data bits (data management), including control bits (control data) and bit indicator flag (indicating a value "1").

Module 224 detection error compares the bits of the detection of errors received (you Islandia) in the base station eNB, bits detection of errors received (computed) by the user terminal (UE) (module 222 adding PMI), to determine the correct data transmitted from the base station eNB (detected whether any error). When detected no errors, on the basis of data from the base station eNB may be performed subsequent operations. On the other hand, when the detected error, the data from the base station eNB may be discarded or saved for the preparation of the subsequent combining of packages.

The module 230 multiplication matrix pre-coding performs the operation of weighing using matrix pre-coding in relation to the accepted physical downstream shared channel (PDSCH). This matrix is pre-coding can be a matrix of pre-coding previously returned from the user terminal (UE) to the base station eNB, or a matrix of pre-encoding, defined as the default matrix pre-coding, depending on the result of the determination performed in the module 224 detection errors.

The module 232 signal separation divides the received signal streams using any known in the art of how to partition the signal.

Module 234 channel decoding (decode the Finance performs channel decoding (decoding) the received physical downstream shared channel (PDSCH).

Module 236 parallel-serial conversion converts many parallel streams into a serial signal sequence and outputs the converted signal sequence that is identical to the signal sequence formed in base station eNB to perform the radio.

The present invention described above with reference to the particular implementation. However, the person skilled in the art should be understood that the above embodiments of the described only for the purpose of explanation and that various modifications, transformations, alternatives, modifications, etc. To facilitate understanding of the present invention used in the description of a particular magnitude. However, it should be noted that such specific values are only approximate values, unless otherwise indicated, and may be used for any other values. To explain the device in accordance with the embodiment of the present invention is described with reference to the functional diagram. However, such a device may be implemented using hardware, software or combinations thereof. The present invention is not limited to the above implementation options, and various modifications, transformations, alternatives, izmenenii etc. without deviating from the scope and essence of the present invention.

This application is based on patent application of Japan No. 2007-161942 filed 19.06.07, the entire contents of which are incorporated herein by reference, and which in the present application claims priority.

1. The base station is made with the possibility of communicating with the user terminal in a mobile communication system using a scheme multiple input multiple-output (MIMO) using a pre-coding, containing a receiving module, configured to receive the indicator matrix pre-coding indicating the specified matrix pre-coding; determining module, configured to determine the value of the indicator flag that specifies whether to use matrix a preliminary encoding specified in the indicator matrix pre-coding for communication in downlink; module generating a control signal, configured to generate a downward control signal that includes at least the indicator flag; and the transmitting module, configured to transmit a signal including downlink control signal in downlink.

2. The base station according to claim 1, characterized in that the module g is the generation of the control signal receives information detection errors by performing predetermined calculations on the object of calculation, including at least the management information and the indicator flag; module generating a control signal performs channel encoding part of the data, including information management, the indicator flag and information of the detection of an error by processing part of the data as part of channel coding; and a module for generating the control signal determines whether to enable the indicator matrix pre-coding in object computing, based on the value of the indicator flag.

3. The base station according to claim 1, wherein, if the determining module determines that the matrix prior encoding specified in the indicator matrix pre-coding should not be used for communication in the downlink, for communication in downlink as a matrix pre-coding is selected, the default matrix pre-coding, previously known as the base station and the user terminal.

4. The base station according to claim 1, characterized in that the indicator flag is expressed by one bit.

5. The base station according to claim 1, characterized in that the indicator flag is expressed by more than one bit to select any one of several default matrices pre-coding for the site.

6. The base station according to claim 2, wherein, if the indicator value of the flag is the specified value, the module generating a control signal performs channel encoding part of the data, including information management, which is a convolution of the indicator matrix pre-coding indicator flag and information of the detection of an error by processing part of the data as part of channel coding.

7. The base station according to claim 1, characterized in that it further comprises a detection module errors made with the possibility of performing detection of errors with respect to the indicator matrix pre-encoding.

8. The base station according to claim 7, wherein the receiving module receives the indicator matrix pre-coding and the detection error of the indicator matrix pre-coding; and a detection module errors performs error detection by comparing the information of the detection of the errors calculated in the user terminal, and information of the detection of the errors calculated in the base station.

9. The base station according to claim 7, characterized in that the detection module errors performs error detection on the basis of the level of quality of reception of the rising of the reference signal received from the terminal is the user.

10. The base station according to claim 7, characterized in that the detection module performs error detection of the error, based on information credibility shared data channel received from the user terminal.

11. The method of controlling communication used in the base station configured to communicate with a user terminal in a mobile communication system using a scheme multiple input multiple-output (MIMO) using a pre-coding, including:
the step of receiving, which take the indicator matrix pre-coding indicating the specified matrix pre-encoding;
step definitions, which define the value of the indicator flag that specifies whether to use matrix a preliminary encoding specified in the indicator matrix pre-coding for communication in downlink;
the step of generating a control signal, which generates a downlink control signal including at least an indicator flag; and
step transmission, which transmit a signal including downlink control signal in downlink.

12. The user terminal, configured to communicate with the base station in the mobile communication system using a scheme with many wholevehicle (MIMO) using pre-encoding, contains the module assignment with the possibility of job matrix pre-coding, which should be used for communication in the downlink; a sending module, configured to transmit to the base station indicator matrix pre-coding, and the indicator matrix pre-coding indicates the specified matrix pre-coding; the receiving module and the decoding performed by the reception of the base station signal, comprising an indicator flag, information management and information detection errors, and the indicator flag specifies whether to use matrix a preliminary encoding specified in the indicator matrix pre-coding for communication in downlink and with the possibility of decoding the received signal; module information made with the possibility of obtaining information detection errors by performing predetermined calculations on the object of calculation, including at least the management information and the indicator flag; and a determining module, configured to determine whether to use matrix a preliminary encoding specified in the indicator matrix pre-coding to implement the Oia communication in the downlink, by comparing the information of the detection of the errors calculated in the base station information detection errors calculated in the user terminal, and determining whether to enable the indicator matrix pre-coding the object of calculation is based on the value of the indicator flag.

13. The user terminal according to item 12, wherein, if the determining module determines that the matrix prior encoding specified in the indicator matrix pre-coding should not be used for communication in the downlink, for communication in downlink as a matrix pre-coding is selected, the default matrix pre-coding, previously known as the base station and the user terminal.

14. The user terminal according to item 12, wherein the indicator flag is expressed by one bit.

15. The user terminal according to item 12, wherein the indicator flag is expressed by more than one bit to select any one of several default matrices pre-encoding.

16. The user terminal according to item 12, wherein, if the indicator value of the flag is the specified value, it retrieves the Indus is Katara matrix pre-encoding, last convolution with information management.

17. The user terminal according to item 12, wherein the user terminal transmits to the base station indicator matrix pre-coding and information detection error obtained by performing predetermined calculations on the indicator matrix pre-encoding.

18. The method of controlling communication used in the user terminal, configured to communicate with the base station in the mobile communication system using a scheme multiple input multiple-output (MIMO) using a pre-coding, including:
the job step, which specify the matrix prior encoding that should be used for communication in downlink;
step transmission, which transmits to the base station indicator matrix pre-coding, and the indicator matrix pre-coding indicates the specified matrix pre-encoding;
the step of receiving and decoding, which take from the base station, the signal comprising an indicator flag, information management and information detection errors, and the indicator flag specifies whether to use matrix a preliminary encoding specified in the indicator matrix prior is tiravanija, for communication in the downlink, and decode the received signal;
the step of obtaining information on which to receive information detection errors by performing predetermined calculations on the object of calculation, including at least the management information and the indicator flag; and
step definitions, which define whether to use matrix a preliminary encoding specified in the indicator matrix pre-coding for communication in the downlink, by comparing information detecting errors calculated in the base station information detection errors calculated in the user terminal, and determining whether to enable the indicator matrix pre-coding the object of calculation is based on the value of the indicator flag.



 

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22 cl, 3 dwg, 4 tbl

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: transmission of information, applicable in cellular and satellite communication systems.

SUBSTANCE: the receiver has two frequency converters, two quadrature correlators, phase error filter, controlled oscillator, two control elements, error delay filter, controlled clock oscillator, reference signal generator, two multipliers, two analog-to-digital converter, delay line, demodulator, decoder, two matched filters, phase shifter.

EFFECT: enhanced power efficiency of the communication system.

2 cl, 3 dwg

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

Deep paging method // 2260912

FIELD: communication systems.

SUBSTANCE: method includes forming paging channel message combined with Walsh series with length not less than 2m, which is then sent at data transfer speed below 480 bits per second. By transmitting message of paging channel at low data transfer speed and integration of gathered energy message can penetrate into buildings and other structures or environments with high level of fading.

EFFECT: higher efficiency.

4 cl, 6 dwg

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