JP2016187118A - Base station device, terminal device, communication method, and communication system - Google Patents

Base station device, terminal device, communication method, and communication system Download PDF

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JP2016187118A
JP2016187118A JP2015066647A JP2015066647A JP2016187118A JP 2016187118 A JP2016187118 A JP 2016187118A JP 2015066647 A JP2015066647 A JP 2015066647A JP 2015066647 A JP2015066647 A JP 2015066647A JP 2016187118 A JP2016187118 A JP 2016187118A
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identification information
terminal
base station
unit
terminals
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大関 武雄
Takeo Ozeki
武雄 大関
俊明 山本
Toshiaki Yamamoto
俊明 山本
恭宏 末柄
Yasuhiro Suegara
恭宏 末柄
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Kddi株式会社
Kddi Corp
Kddi株式会社
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Abstract

PROBLEM TO BE SOLVED: To increase the utilization efficiency of radio resources.SOLUTION: A base station device 11 comprises: an identification information allocation unit 102 that controls a plurality of terminals with common identification information common to the terminals and controls each of the plurality of terminals with individual identification information; an encoding unit 106 for encoding control information to be transmitted using individual identification information corresponding to a transmission destination terminal or the common identification information; and a transmission unit 110 for transmitting the control information encoded by the encoding unit 106.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a control technique for a wireless communication system.

  In the LTE (Long Term Evolution) system as of 2015, when transmitting / receiving terminal-specific data between a base station and a terminal, the base station allocates PDCCH (Physical Downlink Control Channel) resources independent of each other between the terminals, It notifies the terminal of the position of the radio resource in which the data channel (PDSCH (Physical Downlink Shared Channel) / PUSCH (Physical Uplink Shared Channel)) used for transmission / reception of terminal-specific data is arranged, and the modulation / demodulation method and coding rate to be used. This is called scheduling.

  The terminal performs blind decoding on the search space of the PDCCH to be monitored by the terminal using different RNTI (Radio network temporary identifier, a key for decoding the PDCCH) assigned to each terminal. It is recognized that the PDCCH that has succeeded in the above is the PDCCH addressed to the terminal.

  As shown in Non-Patent Documents 1 and 2, in the conventional PDCCH, the number of terminals that can be scheduled per subframe is the number of CCEs (Control Channel Elements) used for the PDCCH or RBs that can be used in the data channel ( It was limited by the number of Resource blocks. Therefore, EPDCCH (Enhanced PDCCH) that uses a radio resource area used for PDSCH as PDCCH is defined as a solution when PDCCH resources are exhausted due to an increase in the number of simultaneously connected users.

  Further, as shown in Non-Patent Document 3, 3GPP (3rd Generation Partnership Project) is a non-orthogonal multiple access that multiplexes multiple users' signals on the same RB and transmits them simultaneously as an LTE multiple access scheme. A system (NOMA: Non-Orthogonal Multiple Access) has been proposed as an extension of the current standard.

  As described above, when non-orthogonal multiple access is performed on a data channel, the restriction on the number of scheduling terminals per subframe due to the number of RBs used for the data channel is relaxed. For this reason, it is desired to schedule as many terminals as possible. However, if this is done, there is a possibility that resources for allocating PDCCH may be exhausted. The EPDCCH defined to deal with the shortage of resources used for the PDCCH occupies a radio resource area used for the PDSCH, and thus there is a problem that downlink throughput is reduced.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a base station device, a terminal device, a communication method, and a communication system that can improve the utilization efficiency of radio resources.

  One embodiment of the present invention relates to a base station apparatus. This base station apparatus controls a plurality of terminals with common common identification information, and controls an identification information allocating unit for controlling each of the plurality of terminals with individual identification information, and individual identification information corresponding to a destination terminal. Or an encoding unit that encodes the control information to be transmitted using the common identification information, and a transmission unit that transmits the control information encoded by the encoding unit.

  According to such an aspect, for example, when a non-orthogonal multiple access scheme is applied to a destination terminal, control information addressed to a plurality of terminals is transmitted using one PDCCH by using common identification information. This makes it possible to increase the utilization efficiency of radio resources.

  Another embodiment of the present invention relates to a terminal device. The terminal device includes a storage unit that stores common identification information common to a plurality of terminals and individual identification information corresponding to each of the plurality of terminals, and individual identification information corresponding to a terminal to which the base station is a transmission destination. Or a receiving unit that receives control information encoded using common identification information, and control information received by the receiving unit using common identification information or individual identification information stored in the storage unit The decoding part which decodes.

  According to such an aspect, for example, on the terminal side, when the control information received from the base station is successfully decoded with the common identification information, non-orthogonal multiple access is applied because the control information is common with other terminals. If the decoding is successful with the individual identification information, it can be recognized that the non-orthogonal multiple access is not applied because the control information is transmitted only to the terminal.

  It should be noted that any combination of the above-described constituent elements and a representation of the present invention converted between a method, an apparatus, a system, a computer program, etc. are also effective as an aspect of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the base station apparatus, terminal device, communication method, and communication system which can improve the utilization efficiency of a radio | wireless resource can be provided.

It is a figure which shows the structural example of the radio | wireless communications system to which this invention is applied. 1 is a diagram illustrating a configuration example of a base station apparatus according to Embodiment 1. FIG. It is a figure which shows the structural example of the terminal device concerning Example 1. FIG. FIG. 3 is a sequence diagram illustrating an operation of the wireless communication system according to the first embodiment. It is a figure which shows the example of resource allocation concerning Example 2. FIG. FIG. 9 is a sequence diagram illustrating an operation of the wireless communication system according to the third embodiment. FIG. 10 is a diagram illustrating a configuration example of a base station apparatus according to a fourth embodiment. FIG. 10 is a sequence diagram illustrating an operation of the wireless communication system according to the fourth embodiment. It is a figure which shows the method of the CRC check in the case of non-orthogonal multiple access in Example 4.

(Outline of the present invention)
Before describing the embodiments of the present invention, an outline of the present invention will be described first. The present invention relates to a non-orthogonal multiple access scheme (NOMA).

  First, the basic principle of NOMA will be described. FIG. 1 is a diagram illustrating a configuration example of a wireless communication system to which the present invention is applied. As shown in FIG. 1, when two terminals 20 (also referred to as “UE”) are non-orthogonal multiple connected to a base station 10 (also referred to as “BS”), the base station 10 is connected to terminal # 1. And the signal of terminal # 2 is multiplexed and transmitted on the same radio resource. The total transmission power is defined for each of the non-orthogonal-multiplexed terminal signals, and a larger power is allocated to the distant terminal signal having a large propagation loss. By using this difference in power distribution, the terminal # 1 cancels the signal of the terminal # 2 by the serial interference canceller (SIC) and then decodes the signal addressed to itself, and the terminal # 2 A signal addressed to the user can be decoded without processing. That is, in UE # 2, since the distance from BS10 is longer than UE # 1, the power of the arrival signal is also attenuated by the power attenuation due to the distance, and the power itself that can be regarded as interference allocated to UE # 1. Therefore, the power portion allocated to UE # 2 becomes dominant, and thus SIC processing becomes unnecessary.

  By applying the non-orthogonal multiple access method in this way, it becomes possible to connect many terminals simultaneously. However, since the resource area used for PDCCH for transmitting control information is limited to a maximum of 3 OFDM symbols per subframe, there is a concern about resource shortage for allocating PDCCH. Therefore, the present invention proposes a method for realizing a non-orthogonal multiple access scheme without causing PDCCH depletion.

  In the first method, the individual identification information is assigned to each of the plurality of terminals, and the common identification information is assigned to the plurality of terminals. The control information to be transmitted is encoded and transmitted using the individual identification information corresponding to or using the common identification information. In the second method, the base station apparatus assigns individual CRC generator polynomials to a plurality of terminals, and encodes control information to be transmitted to a destination terminal using a plurality of generator polynomials assigned to the plurality of terminals. And send it. By applying these methods, it becomes possible to transmit control information addressed to a plurality of terminals using one PDCCH, so that the utilization efficiency of PDCCH resources can be improved.

  Hereinafter, embodiments of a wireless communication system according to the present invention will be described in detail according to each example. In order to simplify the explanation, each embodiment will be described by focusing on the operation of the downlink (the direction from the base station to the terminal). However, those skilled in the art can also apply to the uplink in which transmission and reception are switched. Is easy to understand. In each embodiment, the description of the above-described configuration and operation is simplified by using the same reference numerals. The same applies hereinafter.

  A first embodiment of the present invention will be described with reference to FIGS. In the first embodiment, the base station assigns individual RNTIs (for example, C-RNTI) to each of a plurality of terminals, and further a common RNTI (in this embodiment, NOMA-C) for the plurality of terminals. -Indicated as RNTI). The base station encodes the PDCCH using the C-RNTI corresponding to the destination terminal when transmitting a packet individually to the terminal, and NOMA-C-RNTI when transmitting the packet to a plurality of terminals. To encode and transmit the PDCCH.

(Configuration example of base station device)
FIG. 2 is a diagram illustrating a configuration example of the base station apparatus 11 of the first embodiment used as the base station 10 of FIG. The base station apparatus 11 includes an identification information allocation unit 102, a scheduling unit 104, an encoding unit 106, a modulation unit 108, and a transmission unit 110, which are connected to each other through a bus or the like. In FIG. 2, only the configuration related to the downlink is described, but it is needless to say that the configuration includes other configurations necessary for performing wireless communication.

  The identification information allocating unit 102 controls a plurality of terminals with common common identification information, and controls each of the plurality of terminals with individual identification information. For example, an individual RNTI (for example, C-RNTI) is allocated to each of a plurality of terminals, and a common RNTI (in this embodiment, expressed as NOMA-C-RNTI) is allocated to the plurality of terminals. . NOMA-C-RNTI allocated by the identification information allocation unit 102 is notified to each terminal by higher layer signaling or the like.

  The scheduling unit 104 performs a scheduling process for allocating resource blocks on a control channel (PDCCH / PUCCH) and a data channel (PDSCH / PUSCH) used for transmitting / receiving a signal to / from the terminal 20. Normally, when downlink data is transmitted for each terminal, the scheduling unit 104 allocates a resource block on the PDSCH used for data transmission for each terminal, and assigns PDCCH resources for transmitting scheduling information for each terminal to each terminal. Assign to. When transmitting data to a plurality of terminals by non-orthogonal multiple access, the scheduling unit 104 assigns the same resource block on the PDSCH to the plurality of terminals.

  Here, when transmitting scheduling information in the case of non-orthogonal multiple access, if PDCCHs for individual terminals are allocated, PDCCHs corresponding to the number of terminals are occupied. Therefore, in the present embodiment, in order to increase the use efficiency of PDCCH resources, the scheduling unit 104 aggregates into one scheduling information and allocates one PDCCH in the case of non-orthogonal multiple access. Data to be transmitted on the control channel and the data channel is input to the encoding unit 106.

  The encoding unit 106 generates and adds CRC parity bits to data to be transmitted using a predetermined CRC (Cyclic Redundancy Check) generation polynomial, and then performs scramble processing, convolutional encoding, interleaving processing, and the like. Output to. Here, when transmitting data individually for each terminal, encoding section 106 scrambles the CRC parity bit using C-RNTI corresponding to the terminal of the destination of PDCCH. When data is transmitted to a plurality of terminals by non-orthogonal multiple access, the CRC parity bit is scrambled by using PDCCH with NOMA-C-RNTI preferentially.

  Modulation section 108 modulates the encoded data output from encoding section 106 using a predetermined modulation scheme, and outputs the modulated data to transmission section 110. Note that various modulation schemes such as QPSK, 16-QAM, and 64-QAM may be used for the modulation unit 108.

  Transmitting section 110 transmits a signal including modulated data input from modulating section 108 from an antenna by radio. In addition, the transmission unit 110 can change the transmission power level, the direction of the transmission beam, and the beam width of a signal to be wirelessly transmitted.

(Configuration example of terminal device)
FIG. 3 is a diagram of a configuration example of the terminal device 21 according to the first embodiment that is used as the terminal 20 of FIG. The terminal device 21 includes a storage unit 202, a reception unit 204, a demodulation unit 206, and a decoding unit 208. In FIG. 3, only the configuration related to the downlink is described, but it is needless to say that the configuration includes other configurations necessary for performing wireless communication.

  The storage unit 202 stores the terminal-specific C-RNTI assigned from the base station, and when the base station is notified of a common NOMA-C-RNTI to a plurality of terminals by higher layer signaling or the like. Store NOMA-C-RNTI.

  The reception unit 204 performs reception processing such as amplification and frequency conversion on the signal received wirelessly by the antenna, and outputs the received signal to the demodulation unit 206.

  Demodulation section 206 performs demodulation processing on the signal input from reception section 204 and outputs the demodulated signal to decoding section 208. The demodulation processing of the demodulator 206 corresponds to the modulation processing method performed in the base station that is the transmission source of the received signal.

  Decoding section 208 decodes the demodulated data input from demodulation section 206 and outputs the decoded data. This decoding process corresponds to the encoding method performed at the base station that is the transmission source of the received signal, performs deinterleaving, Viterbi decoding, descrambling processing, etc., and uses a predetermined CRC generator polynomial to correct errors. Perform CRC check to detect.

  Here, in the PDCCH decoding process, the decoding unit 208 blind-decodes the search space corresponding to the C-RNTI of the terminal, and if NOMA-C-RNTI is notified, NOMA-C -Blind decoding is also performed for the search space corresponding to RNTI. When the PDCCH decoding is successful in C-RNTI, it can be recognized that the control information is transmitted only to the terminal. On the other hand, when PDCCH decoding is successful in NOMA-C-RNTI, it can be recognized that the control information is addressed to a plurality of terminals (for example, scheduling information for non-orthogonal multiple access).

  When data addressed to a plurality of terminals is multiplexed and transmitted on the same resource block of the PDSCH by non-orthogonal multiple access, signals from other terminals are removed as interference signals in the receiver 204 or the demodulator 206, etc. Interference canceller processing is performed, and processing for obtaining a signal addressed to the terminal is performed.

(Operation)
Next, the operation of the wireless communication system according to the first embodiment configured as described above will be described. FIG. 4 is a sequence diagram of the operation of the wireless communication system according to the first embodiment.

  First, the base station assigns C-RNTI1 and C-RNTI2 as terminal-specific identification information to terminal # 1 and terminal # 2, and further assigns NOMA-C-RNTI as common identification information. In FIG. 4, the base station assigns C-RNTI1 and NOMA-C-RNTI to terminal # 1 (S10), and assigns C-RNTI2 and NOMA-C-RNTI to terminal # 2. (S12).

  When the base station transmits a packet only to the terminal # 1, the PDCCH allocated to each terminal is scrambled by the C-RNTI 1 and transmitted (S14). Terminal # 1 attempts to decode PDCCH using each of C-RNTI1 and NOMA-C-RNTI. Since the PDCCH is scrambled by C-RNTI1, terminal # 1 recognizes that the packet is transmitted only to its own terminal, successfully decoded by C-RNTI1. Terminal # 2 attempts to decode the PDCCH using each of C-RNTI2 and NOMA-C-RNTI. Since PDCCH is scrambled by C-RNTI1, decoding cannot be performed.

  When the base station transmits a packet only to the terminal # 2, the PDCCH allocated to each terminal is scrambled by the C-RNTI 2 and transmitted (S16). Terminal # 1 attempts to decode PDCCH using C-RNTI1 and NOMA-C-RNTI, but cannot decode because PDCCH is scrambled by C-RNTI2. Terminal # 2 attempts to decode the PDCCH using each of C-RNTI2 and NOMA-C-RNTI. Since the PDCCH has been scrambled by C-RNTI2, terminal # 2 recognizes that the packet has been successfully decoded by C-RNTI2 and is transmitted only to its own terminal.

  When the base station transmits a packet addressed to the terminal # 1 and a packet addressed to the terminal # 2 by non-orthogonal multiplexing, the base station assigns one PDCCH allocated for aggregation and transmission to one scheduling information to NOMA-C- It is scrambled by RNTI and transmitted (S18). Terminal # 1 attempts to decode PDCCH using each of C-RNTI1 and NOMA-C-RNTI. Since PDCCH is scrambled by NOMA-C-RNTI, terminal # 1 succeeds in decoding by NOMA-C-RNTI, and a packet addressed to itself is non-orthogonally multiplexed with a packet addressed to another terminal and transmitted. Recognize that Similarly, terminal # 2 attempts to decode PDCCH using each of C-RNTI1 and NOMA-C-RNT2. Since the PDCCH is scrambled with NOMA-C-RNTI, terminal # 2 succeeds in decoding with NOMA-C-RNTI, and the packet addressed to itself is non-orthogonally multiplexed with the packet addressed to another terminal and transmitted. Can be recognized.

  As described above, according to the first embodiment, it is possible to transmit control information addressed to a plurality of terminals using one PDCCH, and thus it is possible to efficiently use resources in the PDCCH region. Therefore, non-orthogonal multiple access can be realized without causing depletion of PDCCH resources. Further, since there is no dependency on the EPDCCH that occupies the radio resource region for PDSCH, the throughput of the downlink data channel is not reduced.

  In the second embodiment, a case where the present invention is applied to cross carrier scheduling in carrier aggregation will be described. FIG. 5 is a diagram illustrating an example of resource allocation according to the second embodiment. Carrier aggregation is a technique for improving the transmission rate by bundling a plurality of component carriers (CC). In FIG. 5, two component carriers CC0 and CC1 are used simultaneously to transmit the downlink of terminal # 1 and terminal # 2. Speed up communication. Further, in CC1, a packet addressed to terminal # 1 and a packet addressed to terminal # 2 are non-orthogonally multiplexed and transmitted.

  Each PDCCH is configured by one or a plurality of continuous CCEs (Control Channel Elements). The control information for notifying the resource allocation information of each CC is generally transmitted using the PDCCH of each CC. However, in cross carrier scheduling, control information for a plurality of CCs is assigned to a specific CC. Aggregate in the PDCCH region.

  As described in the first embodiment, by applying the present invention, it becomes possible to transmit control information addressed to a plurality of terminals using one PDCCH, and the number of PDCCHs used can be reduced. It is easy to aggregate PDCCHs for use in a limited number of CCs. For example, as shown in FIG. 5, CC1 control information is aggregated into CC0 as one PDCCH, so that CC1 can be made to transmit no PDCCH, so that an effect of reducing inter-cell interference of PDCCH can be obtained. Is possible. Also, according to FIG. 5, since terminal # 1 and terminal # 2 need only decode the PDCCH region of CC0, the number of times of blind decoding at the terminal can be reduced.

  The third embodiment of the present invention is a modification of the first embodiment. In the first embodiment, NOMA-C-RNTI is assigned as common identification information separately from terminal-specific identification information (C-RNTI). However, in the third embodiment, non-orthogonal multiple access is performed as common identification information. The C-RNTI of any one of a plurality of terminals is used.

(Constitution)
Since the configurations of the wireless communication system, the base station apparatus, and the terminal apparatus according to the third embodiment are the same as those in the first embodiment, description will be made with reference to FIGS. . In the third embodiment, the operation of the identification information assigning unit 102 is different from that in the first embodiment.

  The identification information allocation unit 102 allocates individual identification information (for example, C-RNTI) to each of a plurality of terminals, and uses the individual identification information already allocated to a predetermined terminal as common identification information. Assign to a terminal other than the predetermined terminal. The common identification information allocated by the identification information allocation unit 102 is notified only to terminals other than the predetermined terminal by signaling or the like.

(Operation)
FIG. 6 is a sequence diagram of the operation of the wireless communication system according to the third embodiment. Here, as shown in FIG. 1, it is assumed that terminal # 1 and terminal # 2 are non-orthogonal multiple connected to base station 10. Further, it is assumed that terminal # 1 exists in the vicinity of base station 10 and terminal # 2 exists at the cell edge of base station 10.

  In FIG. 6, the base station allocates C-RNTI1 to terminal # 1 existing in the vicinity of the base station (S20). Further, the base station assigns C-RNTI2 to terminal # 2 existing at the cell edge and assigns C-RNTI1 as common identification information (S22).

  When the base station transmits a packet only to the terminal # 2, the PDCCH is scrambled by C-RNTI2 and transmitted (S24). Terminal # 1 attempts to decode PDCCH using C-RNTI1. Since PDCCH is scrambled by C-RNTI2, it cannot be decoded. Terminal # 2 attempts to decode PDCCH using each of C-RNTI2 and C-RNTI1. Since the PDCCH has been scrambled by C-RNTI2, terminal # 2 recognizes that the packet is transmitted only to itself by successfully decoding with C-RNTI2.

  When the base station transmits a packet only to terminal # 1, the PDCCH is scrambled by C-RNTI1, and when transmitting the PDCCH, only power necessary for terminal # 1 to receive is performed. (S26). Terminal # 1 attempts to decode PDCCH using C-RNTI1. Since the PDCCH is scrambled by C-RNTI1, the decoding is successful and the packet addressed to itself is received. Terminal # 2 attempts to decode the PDCCH using each of C-RNTI2 and C-RNTI1, but the reception power is insufficient and decoding fails.

  When the base station transmits a packet addressed to terminal # 1 and a packet addressed to terminal # 2 by non-orthogonal multiplexing, the PDCCH is scrambled by C-RNTI1, and power control is performed when transmitting the PDCCH. Thus, both terminal # 1 and terminal # 2 transmit at a power level necessary for reception (S28). Terminal # 1 attempts to decode PDCCH using C-RNTI1. Since the PDCCH is scrambled by C-RNTI1, terminal # 1 succeeds in decoding by C-RNTI1. Terminal # 2 attempts to decode PDCCH using each of C-RNTI2 and C-RNTI1. Since the PDCCH is scrambled with C-RNTI1, terminal # 2 succeeds in decoding with C-RNTI1, and recognizes that the packet addressed to itself is transmitted in a non-orthogonal multiplexed manner with packets addressed to other terminals. be able to.

  As described above, according to the third embodiment, similarly to the first embodiment, control information addressed to a plurality of terminals can be transmitted using one PDCCH, so that resources in the PDCCH region can be used efficiently. become. In addition, it is not necessary to separately provide common identification information as in the first embodiment, and the problem that the C-RNTI is exhausted is avoided by using the C-RNTI already assigned to the terminal as the common identification information. Can do.

(Modification)
As a modification of the third embodiment, in S26 and S28 of FIG. 6, the direction of the transmission beam may be changed instead of controlling the transmission power level. For example, in S26
When the base station transmits a packet only to terminal # 1, the PDCCH is scrambled by C-RNTI1, and when transmitting the PDCCH, the distance and direction of terminal # 1 are set so that only terminal # 1 can receive the packet. Considering this, the transmission beam direction and beam width are controlled for transmission. In S28, when the base station transmits the packets of terminal # 1 and terminal # 2 by non-orthogonal multiplexing, the PDCCH is scrambled by C-RNTI1, and when transmitting the PDCCH, terminal # 1 and terminal # 2 are transmitted. In consideration of the distance and direction of both terminals so that both of # 2 can receive, transmission is performed by controlling the direction and beam width of the transmission beam.

  In addition, when controlling transmission power in order to select a receiving terminal, it is necessary to assign C-RNTI of the terminal of the base station vicinity as common identification information, However, When controlling a transmission beam like this modification The C-RNTI of any terminal can be used as common identification information regardless of whether NOMA is applicable or not, and regardless of the position of the terminal.

  A fourth embodiment of the present invention will be described with reference to FIGS. In the fourth embodiment, the base station assigns individual CRC generator polynomials to a plurality of terminals, and encodes control information to be transmitted to a destination terminal using a plurality of generator polynomials assigned to the plurality of terminals. Send.

(Configuration example of base station device)
FIG. 7 is a diagram illustrating a configuration example of the base station apparatus 12 of the fourth embodiment used as the base station 10 of FIG. Base station apparatus 12 includes a generator polynomial allocating unit 103, a scheduling unit 104, an encoding unit 106, a modulating unit 108, and a transmitting unit 110. In FIG. 7, only the configuration related to the downlink is described, but it is needless to say that the configuration includes other configurations necessary for performing wireless communication. The same components as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The generator polynomial assigning unit 103 assigns different CRC generator polynomials to a plurality of non-orthogonal multiplexed terminals. Information on the CRC generator polynomial assigned by the generator polynomial assigner 103 is notified to each terminal by the transmitter 110.

  The encoding unit 106 encodes control information to be transmitted to the destination terminal using the plurality of generator polynomials assigned to the plurality of terminals by the generator polynomial assigning unit 103. For example, when data is transmitted individually to each terminal, CRC parity for error detection using a CRC generator polynomial corresponding to the destination terminal is used for the PDCCH that transmits PDSCH / PUSCH allocation information of the destination terminal. Add a bit. When transmitting data to a plurality of terminals by non-orthogonal multiple access, a polynomial represented by multiplication of a plurality of CRC generator polynomials is used for the PDCCH that transmits PDSCH / PUSCH allocation information transmitted by non-orthogonal multiple access. To add a CRC parity bit. The control information encoded by the encoding unit 106 is modulated by the modulation unit 108 and then transmitted to each terminal by the transmission unit 110.

(Configuration example of terminal device)
Since the configuration of the terminal device is the same as that in FIG. 3, the description will be made with reference to FIG. The difference from the first embodiment is the contents stored in the storage unit 202 and the operation of the decoding unit 208. The storage unit 202 stores individual CRC generator polynomials assigned from the base station. Decoding section 208 performs parity check on received bits using an individual CRC generator polynomial assigned from the base station, and determines the occurrence of an error.

(Operation)
Next, the operation of the wireless communication system according to the fourth embodiment configured as described above will be described. FIG. 8 is a sequence diagram of the operation of the wireless communication system according to the first embodiment.

The base station as a terminal separate CRC generator polynomial, assigns a CRC generator polynomial C 0 to the terminal # 1 (S30), allocates a CRC generator polynomial C 1 to terminal # 2 (S32).

When the base station transmits a packet only to the terminal # 1, a CRC parity bit generated using the CRC generation polynomial C 0 is added to the PDCCH assigned to the terminal # 1 (S34). Terminal # 1, using the CRC generator polynomial C 0 inspecting CRC parity bits PDCCH. Since the CRC parity bit is generated with the CRC generator polynomial C 0 , the terminal # 1 succeeds in the parity check with the CRC generator polynomial C 0 and recognizes that the packet is transmitted to the own terminal. Terminal # 2 is to check the CRC parity bits with a CRC generator polynomial C 1, since the CRC parity bits are generated by CRC generator polynomial C 0, it fails the parity check.

If the base station transmits a packet only to the terminal # 2, to PDCCH assigned to the terminal # 2, adds a CRC parity bits generated using a CRC generator polynomial C 1 (S36). Terminal # 1 is using the CRC generator polynomial C 0 inspecting CRC parity bits PDCCH, for CRC parity bits are generated by CRC generator polynomial C 1, it fails the parity check. Terminal # 2, using the CRC generator polynomial C 1 examines the CRC parity bits. Since CRC parity bits which are generated by CRC generator polynomial C 1, the terminal # 2 is successfully parity check by the CRC-generating polynomial C 1, recognizes that a packet transmitted to the own terminal.

When the base station transmits a packet addressed to the terminal # 1 and a packet addressed to the terminal # 2 by non-orthogonal multiplexing, the base station allocates one PDCCH to be aggregated and transmitted in one scheduling information. A CRC parity bit generated by using a CRC generation polynomial C 0 C 1 represented by multiplication of the CRC generation polynomial C 0 and the CRC generation polynomial C 1 is added to this one PDCCH (S38). Terminal # 1, using the CRC generator polynomial C 0 inspecting CRC parity bits PDCCH. Since the CRC parity bit is generated with the CRC generator polynomial C 0 C 1 , the terminal # 1 succeeds in the parity check with the CRC generator polynomial C 0 and recognizes that the packet is transmitted to the terminal itself. Terminal # 2, using the CRC generator polynomial C 1 examines the CRC parity bits. Since the CRC parity bit is generated with the CRC generator polynomial C 0 C 1 , the terminal # 2 succeeds in the parity check with the CRC generator polynomial C 1 and recognizes that the packet is transmitted to the terminal itself.

FIG. 9 is a diagram illustrating a CRC check method in the case of non-orthogonal multiple access in the fourth embodiment. The base station 10 transmits PDSCH / PUSCH allocation information to be transmitted by non-orthogonal multiple access to terminal # 1 and terminal # 2 using one PDCCH. Further, it is assumed that CRC generator polynomial C 0 is assigned to terminal # 1, and CRC generator polynomial C 1 is assigned to terminal # 2.

On the base station side, the DCI (Downlink Control Information) bits for non-orthogonal multiple access carried on the PDCCH are multiplied by the CRC generator polynomial C 0 assigned to the terminal # 1 and the CRC generator polynomial C 1 assigned to the terminal # 2. A CRC parity bit generated using the polynomial CRC generation polynomial C 0 C 1 is added and transmitted to terminal # 1 and terminal # 2.

Terminal # 1 performs a parity check using the CRC generator polynomial C 0 assigned to the terminal # 1. If no error is detected, the fixed length is extracted from the head and DCI is decoded. Similarly, the terminal # 2, performs a parity check using the CRC generator polynomial C 1 assigned to the terminal # 2, if no error is detected, remove the fixed length from the head, decodes the DCI.

  As described above, according to the fourth embodiment, it is possible to notify scheduling information to a non-orthogonal multiple access terminal by using one PDCCH by improving the CRC check method for PDCCH. Therefore, non-orthogonal multiple access can be realized without causing depletion of PDCCH resources.

  In the above, this invention was demonstrated based on the Example. The present invention is not limited to the above-described embodiments and the contents of each embodiment, and various modifications can be made within the scope of the gist of the present invention. The above-mentioned embodiment is an exemplification, and various modifications can be made to the combination of each component and each processing process by combining each embodiment, and such a modification is also within the scope of the present invention. Will be understood by those skilled in the art.

DESCRIPTION OF SYMBOLS 10 ... Base station (BS), 20 ... Terminal (UE), 11 ... Base station apparatus, 102 ... Identification information allocation part, 104 ... Scheduling part, 106 ... Coding part, 108 ... Modulation part, 110 ... Transmission part, 21 , A terminal device, 202, a storage unit, 204, a reception unit, 206, a demodulation unit, and 208, a decoding unit.

Claims (9)

  1. An identification information assigning unit that controls a plurality of terminals with common common identification information, and controls each of the plurality of terminals with individual identification information;
    An encoding unit that encodes control information to be transmitted using individual identification information corresponding to a destination terminal or using common identification information;
    A transmission unit for transmitting control information encoded by the encoding unit;
    A base station apparatus comprising:
  2. The encoding unit encodes control information to be transmitted by preferentially using common identification information when a non-orthogonal multiple access scheme is applied to a destination terminal. Item 8. The base station apparatus according to Item 1.
  3.   The said identification information allocation part controls 2nd terminals other than the said 1st terminal by using the separate identification information corresponding to a predetermined | prescribed 1st terminal as common identification information, The said 1st terminal is characterized by the above-mentioned. Base station device.
  4. When the non-orthogonal multiple access scheme is applied to the first terminal and the second terminal, the identification information allocating unit is predetermined by the base station apparatus among the first terminal and the second terminal. The base station apparatus according to claim 3, wherein the individual identification information corresponding to the specific terminal is used as common identification information.
  5. 5. The transmission unit according to claim 1, wherein the transmission unit controls transmission power or a transmission beam according to a positional relationship between a destination terminal and the base station apparatus, and transmits control information. The base station apparatus as described in.
  6. A generator polynomial assigning unit that assigns individual CRC generator polynomials to a plurality of terminals;
    An encoding unit that encodes control information to be transmitted to a destination terminal using a plurality of generator polynomials assigned to a plurality of terminals by the identification information allocation unit;
    A transmission unit that transmits control information encoded by the encoding unit, and information on a CRC generator polynomial assigned to a destination terminal;
    A base station apparatus comprising:
  7. A communication method used for a base station capable of wireless communication with a plurality of terminals,
    Controlling a plurality of terminals with common common identification information, and controlling each of the plurality of terminals with individual identification information;
    Using the individual identification information corresponding to the destination terminal or using the common identification information, an encoding step for encoding the control information to be transmitted, and the control information encoded by the encoding step are transmitted. Sending step;
    A communication method comprising:
  8. A storage unit that stores common identification information common to a plurality of terminals and individual identification information corresponding to each of the plurality of terminals;
    A receiving unit that receives control information encoded using the individual identification information corresponding to the terminal of the transmission destination by the base station or the common identification information;
    A terminal device comprising: a decoding unit that decodes the control information received by the receiving unit using the common identification information or the individual identification information stored in the storage unit.
  9. A communication system comprising a base station and a plurality of terminals that perform wireless communication with the base station,
    The base station
    An identification information assigning unit that controls a plurality of terminals with common common identification information, and controls each of the plurality of terminals with individual identification information;
    An encoding unit that encodes control information to be transmitted using individual identification information corresponding to a destination terminal or using common identification information;
    A transmission unit for transmitting control information encoded by the encoding unit;
    With
    The terminal
    A storage unit for storing common identification information and individual identification information corresponding to the terminal;
    A receiving unit for receiving control information transmitted from the base station;
    A communication system comprising: a decoding unit that decodes control information received by the receiving unit using common identification information or individual identification information stored in the storage unit.

JP2015066647A 2015-03-27 2015-03-27 Base station device, terminal device, communication method, and communication system Pending JP2016187118A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018235263A1 (en) * 2017-06-23 2018-12-27 富士通株式会社 Wireless communication system enabling non-orthogonal multiple access, wireless communication base station, and wireless terminal
WO2019065307A1 (en) * 2017-09-29 2019-04-04 ソニー株式会社 Wireless communication device, wireless communication method, and computer program

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018235263A1 (en) * 2017-06-23 2018-12-27 富士通株式会社 Wireless communication system enabling non-orthogonal multiple access, wireless communication base station, and wireless terminal
WO2019065307A1 (en) * 2017-09-29 2019-04-04 ソニー株式会社 Wireless communication device, wireless communication method, and computer program

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