WO2017221352A1 - Système de communication sans fil, station de base, et terminal sans fil - Google Patents

Système de communication sans fil, station de base, et terminal sans fil Download PDF

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Publication number
WO2017221352A1
WO2017221352A1 PCT/JP2016/068531 JP2016068531W WO2017221352A1 WO 2017221352 A1 WO2017221352 A1 WO 2017221352A1 JP 2016068531 W JP2016068531 W JP 2016068531W WO 2017221352 A1 WO2017221352 A1 WO 2017221352A1
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Prior art keywords
signal
base station
enb
interference suppression
data
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PCT/JP2016/068531
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English (en)
Japanese (ja)
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優貴 品田
義博 河▲崎▼
大出　高義
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富士通株式会社
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Priority to PCT/JP2016/068531 priority Critical patent/WO2017221352A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • the technology described in this specification relates to a wireless communication system, a base station, and a wireless terminal.
  • Orthogonal frequency division multiple access is known as an example of a radio access technology used in a radio communication system.
  • JT-CoMP a cooperative communication technique in which a plurality of base stations operate in cooperation and transmit the same data signal at the same frequency and the same time to a specific wireless terminal.
  • JT-CoMP is an abbreviation of “joint transmission-coordinated multi-point”.
  • NOMA non-orthogonal multiple access
  • one of the objects of the technology described in this specification is to improve the throughput of the wireless communication system.
  • the wireless communication system may include a plurality of wireless terminals and a base station.
  • the base station may multiplex and transmit a plurality of data signals addressed to the plurality of wireless terminals to different powers or different codes at the same frequency and time. Further, the base station may transmit a control signal for controlling selection of a target signal to which interference suppression processing is applied in the plurality of wireless terminals among the multiplexed data signals to the plurality of wireless terminals.
  • the wireless terminal may control selection of a data signal to which the interference suppression process is applied according to the received control signal.
  • the base station may include a transmission unit and a control unit.
  • the transmission unit may multiplex and transmit a plurality of data signals addressed to a plurality of wireless terminals to different powers or different codes at the same frequency and time.
  • the control unit may transmit, to the plurality of wireless terminals, a control signal for controlling selection of a target signal to which interference suppression processing is applied in the plurality of wireless terminals among the plurality of multiplexed data signals.
  • the wireless terminal may include a receiving unit, an interference suppression processing unit, and a control unit.
  • the receiving unit may receive the multiplexed data signal from a base station that multiplexes and transmits a plurality of data signals addressed to a plurality of wireless terminals to different powers or different codes at the same frequency and time.
  • the interference suppression processing unit may selectively apply interference suppression processing to the multiplexed data signal.
  • the control unit may control the selective application in the interference suppression processing unit according to a control signal that is received from the base station and controls selection of a target signal to which the interference suppression processing is applied.
  • NOMA non-orthogonal multiple access
  • FIG. 1 is a block diagram illustrating a configuration example of a wireless communication system according to an embodiment.
  • the wireless communication system 1 illustrated in FIG. 1 may include a base station 2 and a wireless terminal 3 exemplarily.
  • the base station 2 may be illustratively connected to the core network 4.
  • the wireless terminal 3 illustrated in FIG. 1 may be regarded as the same movable wireless terminal 3 or different wireless terminals 3.
  • the wireless terminal 3 can wirelessly communicate with the base station 2 in the wireless area 200 formed or provided by the base station 2.
  • the “wireless terminal” may be referred to as “wireless device”, “wireless device”, “terminal device”, or the like.
  • the wireless terminal 3 may be a fixed terminal or a movable mobile terminal (may be referred to as a “mobile device”).
  • the wireless terminal 3 may be a mobile UE such as a mobile phone, a smartphone, or a tablet terminal.
  • UE is an abbreviation for “User Equipment”.
  • the base station 2 forms or provides a wireless area 200 that can communicate with the wireless terminal 3.
  • the “wireless area” may be referred to as “cell”, “coverage area”, “communication area”, “service area”, and the like.
  • the base station 2 may be, for example, an “eNB” compliant with 3rd generation “partnership” project (3GPP) long term evolution (LTE) or LTE-Advanced (hereinafter collectively referred to as “LTE”).
  • 3GPP 3rd generation “partnership” project
  • LTE long term evolution
  • LTE-Advanced hereinafter collectively referred to as “LTE”.
  • ENB is an abbreviation for “evolved Node B”.
  • a communication point which is called a remote radio unit (RRE), remote radio head (RRH), etc., which is separated from the base station main body and located at a remote location, may correspond to the base station 2.
  • the base station 2 may be a relay device that relays communication with the wireless terminal 3.
  • the relay device may correspond to “RN” conforming to LTE.
  • RN is an abbreviation for “Relay Node”.
  • the “cell” formed or provided by the base station 2 may be divided into “sector cells”.
  • the “cell” may include a macro cell and a small cell.
  • the small cell is an example of a cell having a smaller communication range (coverage) than the macro cell.
  • the name of the small cell may be different depending on the coverage area.
  • the small cell may be referred to as “femtocell”, “picocell”, “microcell”, “nanocell”, “metrocell”, “homecell”, and the like.
  • cell means an individual geographical area in which the base station 2 provides wireless services, and is managed by the base station 2 to communicate with the wireless terminal 3 in the individual geographical area. It may also mean a part of the communication function.
  • the core network 4 may include an MME 41, a PGW 42, and an SGW 43 as illustrated in FIG.
  • MME is an abbreviation of “Mobility Management Entity”.
  • PGW is an abbreviation for “Packet Data Gateway”
  • SGW is an abbreviation for “Serving Gateway”.
  • the core network 4 may be regarded as corresponding to an “upper network” for the base station 2.
  • the MME 41, the PGW 42, and the SGW 43 may be regarded as corresponding to an element (NE) or an entity of the “core network”, and may be collectively referred to as a “core node”.
  • the “core node” may be considered to correspond to the “upper node” of the base station 2.
  • the core network 4 may include other elements and entities different from the MME 41, the PGW 42, and the SGW 43.
  • the base station 2 may be connected to the core network 4 by “S1 interface”.
  • the S1 interface is an example of an interface between a base station and a core node, and may be either a wired interface or a wireless interface.
  • a network including the base station 2 and the core network 4 may be referred to as a radio access network (RAN).
  • RAN radio access network
  • An example of RAN is “Evolved Universal Terrestrial Radio Access Network, E-UTRAN”.
  • the base station 2 may be communicatively connected to the MME 41 and the SGW 43, for example.
  • the base station 2 and the MME 41 and the SGW 43 may be communicably connected by, for example, an S1 interface.
  • the SGW 43 may be communicably connected to the PGW 42 via the S5 interface.
  • the S5 interface is an example of an interface between core nodes, and may be either a wired interface or a wireless interface.
  • the PGW 42 may be communicably connected to a packet data network (PDN) such as the Internet or an intranet.
  • PDN packet data network
  • User packets can be transmitted and received between the UE 3 and the PDN via the PGW 42 and the SGW 43.
  • the user packet is an example of user data, and may be referred to as a user plane signal.
  • the SGW 43 may process the user plane signal.
  • the control plane signal may be processed by the MME 41.
  • the SGW 43 may be communicably connected to the MME 41 via the S11 interface. Similar to the S5 interface, the S11 interface is an example of an interface between core nodes, and may be either a wired interface or a wireless interface.
  • the MME 41 illustratively manages the location information of the UE 11.
  • the SGW 43 may perform movement control such as path switching of a user plane signal accompanying movement of the UE 3 based on the position information managed by the MME 41, for example.
  • the mobility control may include control associated with the handover of UE3.
  • the base stations 2 may be connected to be communicable through, for example, an X2 interface.
  • the X2 interface is an example of an interface between base stations, and may be either a wired interface or a wireless interface.
  • the radio area 200 formed by the eNB 2 which is an example of the base station 2 may be referred to as a “macro cell”.
  • the eNB 2 forming the macro cell 200 may be referred to as “macro base station”, “macro eNB”, or “MeNB” for convenience.
  • a “small cell” having a smaller coverage than the macro cell may be arranged (overlaid).
  • ENB2 may control the setting (may be referred to as “allocation”) of radio resources used for radio communication with UE3.
  • Allocation control of radio resources (hereinafter also simply referred to as “resources”) may be referred to as “scheduling”.
  • Scheduling may be performed for downlink (downlink, DL) communication and uplink (uplink, UL) communication, respectively.
  • eNB2 is an example of a radio transmission station
  • UE3 is an example of a radio reception station.
  • next generation for example, the fifth generation (5G)
  • 5G fifth generation
  • further improvement of DL communication throughput is expected. ing.
  • the first approach is an approach for improving the overall DL throughput characteristics of a cell by increasing the number of UEs 3 (in other words, the number of multiple accesses) that can be simultaneously connected to the eNB 2 and receive signals.
  • frequency division multiple access In wireless communication technologies prior to the fourth generation (4G), frequency division multiple access (FDMA), time division multiple access (TDMA), code division multiple access (CDMA), orthogonal frequency division multiple access are examples of multiple access technologies. (OFDMA) or the like is employed.
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • CDMA code division multiple access
  • OFDMA orthogonal frequency division multiple access
  • radio resources allocated to radio terminals are distinguished by dividing them in one or two dimensions. For example, in FDMA, radio resources allocated to a plurality of radio terminals are divided and distinguished in one dimension of the frequency domain. In TDMA, radio resources allocated to a plurality of radio terminals are distinguished by dividing them in one dimension in the time domain.
  • radio resources allocated to a plurality of radio terminals are distinguished by dividing them in one dimension of the code area.
  • radio resources to be allocated to a plurality of radio terminals are divided and distinguished in two dimensions, the frequency domain and the time domain.
  • NOMA that divides and distinguishes wireless resources in three dimensions including a power domain (or code domain) in a frequency domain and a time domain.
  • radio resources are further divided and distinguished in the power domain (or code domain) in addition to the frequency domain and time domain, so that the number of multiple accesses can be increased compared to OFDMA. Therefore, the overall DL throughput characteristics of the cell can be improved, and the utilization efficiency of radio resources can be improved.
  • radio resources distinguished in the frequency domain, the time domain, the power domain, and the code domain may be referred to as a frequency resource, a time resource, a power resource, and a code resource, respectively.
  • FIG. 3 shows an example of a transmission image (power region) in NOMA. Since the radio wave attenuates as the propagation distance increases, eNB2 transmits to UE # 2 with a long distance and transmits to UE # 1 with a short distance, as schematically illustrated in FIG. Transmits with weak power.
  • the frequency resource and time resource used for transmission may be the same for UE # 1 and UE # 2.
  • the distance of UE3 with respect to eNB2 may be determined and determined based on, for example, the reception quality of the DL signal at UE3.
  • the UE 3 may measure the reception strength and quality of the DL reference signal, the pilot signal, and the like.
  • the UE 3 may transmit and report information indicating the measured reception quality (hereinafter also referred to as “radio quality information”) to the eNB 2.
  • radio quality information examples include RSRP, RSRQ, CQI, CSI, and the like.
  • RSRP is an abbreviation for “reference signal received power”
  • RSRQ is an abbreviation for “reference signal received quality”.
  • CQI is an abbreviation of “channel quality indicator”
  • CSI is an abbreviation of “channel state information”.
  • ENB2 may determine that UE3 with better DL reception quality is closer to eNB2 based on DL radio quality information such as RSRP and RSRQ reported from UE3.
  • DL radio quality information such as RSRP and RSRQ reported from UE3.
  • eNB2 when time division duplex (TDD) is used for communication between eNB2 and UE3, eNB2 is an uplink (UL) signal from the symmetry of the radio propagation path of DL and uplink (UL).
  • the reception quality may be estimated as the reception quality of the DL signal at UE3.
  • the eNB 2 can autonomously determine the distance of the UE 3 relative to the eNB 2 without receiving a report of information indicating the DL reception quality from the UE 3.
  • UE # 1 corresponding to the reception point close to eNB2 has received the UE with respect to the power of the received desired wave signal transmitted to UE # 1 with weak power.
  • the power of the signal transmitted with strong power addressed to # 2 interferes.
  • the received power of the signal addressed to UE # 2 that is an interference signal is higher than the received power of the signal addressed to UE # 1 that is a desired reception signal.
  • the interference signal is easier to demodulate and decode than the desired received wave signal.
  • UE # 1 first demodulates and decodes an interference signal with high reception power, and removes or cancels the result from the DL reception signal, thereby extracting a signal addressed to UE # 1 with low reception power. Thereafter, similarly to the reception processing in OFDMA, the extracted signal may be demodulated and decoded.
  • UE # 1 When there is an interference signal having higher reception power than the desired reception signal in addition to the signal addressed to UE # 2, UE # 1 receives, for example, a signal having higher reception power by sequentially performing demodulation and decoding. By canceling the signal, the desired reception wave signal can be extracted.
  • Such interference removal processing may be referred to as “SIC”.
  • SIC is an abbreviation for “Successive Interference Cancellation”.
  • the received power of the signal destined for UE # 2 that is the desired reception signal is set to UE # 1.
  • the power of the addressed signal interferes.
  • non-interference level a negligible noise level that does not affect demodulation and decoding
  • UE # 2 does not need to perform SIC in relation to the signal addressed to UE # 1, and can demodulate and decode the signal addressed to UE # 2, which is the desired reception signal, as usual. is there.
  • the process of removing or canceling the interference signal does not have to mean that the interference signal can be completely removed or canceled from the reception signal, and it means that the interference signal can be suppressed in the reception signal.
  • an interference signal that does not affect the demodulation and decoding of the received signal may be allowed to remain in the received signal without being completely removed or canceled. Therefore, in the following, processing for removing or canceling an interference signal may be referred to as “interference suppression processing”.
  • Multi-user shared access MUSA
  • RSMA Resource spread multiple access
  • SCMA Sparse code multiple access
  • PDMA Pattern defined multiple access
  • NCMA Non-orthogonal coded multiple access
  • FIG. 5 shows an image of a method of superimposing a signal addressed to UE3 in PDMA. Note that “superimposition” may be rephrased as “multiplexing” or “mapping”.
  • a code matrix G code of 4 rows ⁇ 6 columns exemplified by the following Equation 1 is used.
  • the codes in the first column to the sixth column indicate the radio resource mapping pattern in the code area for six UEs # 1 to U # 6, respectively. For example, “1” indicates “assigned” and “0” indicates “not assigned”.
  • the resource mapping pattern of the signal transmitted from the eNB 2 to the DL is a pattern obtained by combining the mapping patterns addressed to the UEs # 1 to U # 6.
  • UE3 using the above code matrix G code, signals its destined in the received signal to identify a resource that is mapped to demodulate and decode the received signal of the resource.
  • the second approach is an approach for improving DL throughput characteristics for a specific UE.
  • two or more base stations 2 cooperate to transmit the same signal to one specific UE 3 using the same resource.
  • UE 3 synthesizes signals received from two or more base stations 2 that operate in cooperation (may be referred to as “cooperative cells” for convenience). Since the signal gain can be improved by combining compared with the case of receiving a signal from one cell, the reception quality of the signal can be improved.
  • the cooperative operation between the base stations 2 and information sharing for the cooperative operation are realized by, for example, communication between base stations using the X2 interface.
  • Examples of information shared between cooperative cells include transmission data signals, channel information, scheduling information, precoding setting information, and the like.
  • next-generation wireless communication technology after 5G there is a possibility of further improving the DL throughput characteristics by combining the above-mentioned NOMA and JT-CoMP communication.
  • FIGS. 7 to 9 schematically illustrate three use cases 1 to 3 of DL communication assumed when NOMA and JT-CoMP communication are used in combination.
  • Use case 1 illustrated in FIG. 7 is that UE # 1 is the target of DL CoMP transmission by two eNBs # 1 and # 2 among UE # 1 to UE # 3, and the target UE # 1 is the other UE # 1. In this case, the UE is located farther from the eNBs # 1 and # 2 than the UEs # 2 and # 3.
  • UE # 2 is located near the cell center of eNB # 1
  • UE # 3 is located near the cell center of eNB # 2
  • UE # 1 is eNB # 1 and # 2 respectively. It is the state located in the cell edge part.
  • UE # 1 is in a state where DL reception quality is lower than that of other UE # 2 in the cell of eNB # 1, and DL reception is also performed in the cell of eNB # 2 than in other UE # 3.
  • the quality is low.
  • eNB # 1 and eNB # 2 perform a cooperative operation and perform DL CoMP transmission based on NOMA toward UE # 1 located at both cell ends.
  • eNB # 1 transmits a signal addressed to UE # 1 with higher power than a signal addressed to UE # 2.
  • eNB # 2 transmits the same signal as eNB # 1 transmits to UE # 1 with higher power than the signal addressed to UE # 3.
  • UE # 2 cancels the signal that eNB # 1 transmits to UE # 1 with strong power and does not attenuate to the non-interference level from the received signal of DL by SIC, so that eNB # 1 itself A signal transmitted with weak power addressed to (UE # 2) is extracted and demodulated and decoded.
  • UE # 3 also cancels the signal that eNB # 2 transmits to UE # 1 with strong power and does not attenuate to the non-interference level from the received signal of DL by SIC, so that eNB # 2 itself (UE # 2) 3) Extract and demodulate and decode the signal transmitted to the destination with weak power.
  • UE # 1 can demodulate and decode the same signal addressed to itself (UE # 1), which CoMP transmitted with strong power by eNB # 1 and eNB # 2, without performing SIC, and combines both signals. By doing so, the reception quality can be improved.
  • Use case 2 is a case where the target UE # 1 of CoMP transmission by eNB # 1 and eNB # 2 is closer to eNB # 1 or eNB # 2 than to other UE # 2 or UE # 3.
  • FIG. 8 illustrates a case where UE # 1 is closer to eNB # 2 than UE # 3.
  • UE # 1 is in a state where the received quality of DL is lower than that of other UE # 2 in the cell of eNB # 1, but in the cell of other eNB # 2, it is more than that of other UE # 3. Also, the DL reception quality is high.
  • eNB # 1 transmits a signal addressed to UE # 1 with higher power than a signal addressed to UE # 2, as in use case 1.
  • UE # 2 the signal transmitted by eNB # 1 to UE # 1 with strong power does not attenuate to the non-interference level. Therefore, UE # 2 cancels the signal not attenuated to the non-interference level from the DL received signal by SIC, and extracts and demodulates the signal transmitted by eNB # 1 to itself (UE # 2) with weak power And decrypt.
  • eNB # 2 transmits the same signal as the signal transmitted from eNB # 1 to UE # 1, with a weaker power than the signal addressed to UE # 3, contrary to use case 1.
  • the signal transmitted from eNB # 1 to UE # 2 with weak power attenuates to a non-interference level, but the signal transmitted from eNB # 2 to UE # 3 with strong power is not. Does not attenuate to interference level.
  • UE # 1 may demodulate and decode the DL reception signal from eNB # 1 without performing SIC.
  • a signal transmitted to eNB # 2 by itself UE # 1 with weak power by canceling the signal addressed to UE # 3 not attenuated to the non-interference level by SIC. Is demodulated and decoded.
  • UE # 1 synthesize combines the signal which canceled the signal addressed to UE # 3 in the DL reception signal from eNB # 2 in DL reception signal from eNB # 2. Thereby, it is possible to appropriately synthesize the DL signal that is CoMP-transmitted to UE # 1 by eNB # 1 and # 2 in UE # 1.
  • Use case 3 is a case where the target UE # 1 of CoMP transmission by eNB # 1 and # 2 is close to eNB # 1 and # 2 with respect to both other UE # 2 and UE # 3.
  • UE # 1 is closer to eNB # 1 than other UE # 2 in the cell of eNB # 1
  • eNB # 2 is also more than other UE # 3 in the cell of eNB # 2.
  • a case close to is shown.
  • UE # 1 has a higher DL reception quality than other UE # 2 in the cell of eNB # 1, and also in other eNB # 2 cells than other UE # 3.
  • the DL reception quality is high.
  • eNB # 1 transmits a signal addressed to UE # 1 with weaker power than a signal addressed to UE # 2
  • eNB # 2 is the same signal as the signal transmitted by eNB # 1 to UE # 1. Is transmitted with lower power than the signal addressed to UE # 3.
  • UE # 1 the signals transmitted by eNB # 1 and # 2 to UE # 2 and # 3 with strong power are not attenuated to the non-interference level, respectively. Accordingly, UE # 1 performs SIC on both DL reception signals from eNB # 1 and # 2, thereby allowing signals destined for UE # 2 and # 3 that are not attenuated to the non-interference level to be received signals of each DL. Cancel from.
  • the UE # 1 cancels the signal addressed to the UE # 2 in the DL reception signal from the eNB # 1, and the signal cancels the signal addressed to the UE # 3 in the DL reception signal from the eNB # 2. , Is synthesized.
  • the reception processing (exemplarily necessity of interference cancellation) at UE # 1 is different as illustrated in Table 1 below.
  • the received signal for which UE # 1 performs SIC is a received signal from the two eNBs 2 that are closer to UE # 1.
  • UE # 1 since eNB # 2 is closer to UE # 1 among eNB # 1 and # 2, UE # 1 performs SIC on the received signal from eNB # 2. .
  • UE # 1 performs SIC on the received signal from eNB # 1. It will be.
  • UE # 1 to UE # 3 measure radio quality information based on reference signals and pilot signals received from eNB # 1 and # 2, respectively, and eNBs corresponding to serving cells Radio quality information is transmitted and reported to # 1 or # 2 (process P11).
  • the “serving cell” is, for example, a cell in which UE # 1 to UE # 3 each establish a radio link.
  • the serving cells for UE # 1 and # 2 are cells that are managed and provided by eNB # 1
  • the serving cell for UE # 3 is a cell that is managed and provided by eNB # 2.
  • UE # 1 and # 2 transmit the measured radio quality information to eNB # 1
  • UE # 3 transmits the measured radio quality information to eNB # 2.
  • a cell that is not a serving cell for each of UEs # 1 to # 3 may be referred to as a neighbor cell or a neighboring cell.
  • a cell managed and provided by eNB # 1 corresponds to a neighbor cell for UE # 3.
  • the cell which eNB # 2 manages and provides corresponds to a neighbor cell for UE # 1 and # 2.
  • the eNB 2 that manages and provides the serving cell may correspond to the main base station for CoMP communication
  • the eNB 2 that manages and provides the neighbor cell may correspond to the base station for the CoMP communication.
  • eNB # 1 corresponds to a main base station for CoMP communication with respect to UE # 1
  • eNB # 2 corresponds to a base station with which CoMP communication for UE # 1 follows.
  • the eNBs # 1 and # 2 When the eNBs # 1 and # 2 receive the radio quality information from the UEs # 1 to # 3, respectively, the eNBs # 1 and # 2 cooperate with each other and transmit to the UEs # 1 to # 3 based on the received radio quality information.
  • the transmission pattern of the data signal is selected and determined (process P12).
  • the eNBs # 1 and # 2 determine which of the use cases 1 to 3 described above is to transmit the data signal to the UEs # 1 to # 3 based on the received radio quality information, and the determination result Select and determine the transmission pattern according to.
  • the eNBs # 1 and # 2 indicate the interference cancellation mode as illustrated in FIG. 12 to the transmission sources UE # 1 to UE # 3 of the received radio quality information, respectively.
  • Information and information indicating the data superposition pattern may be transmitted and notified (processing P13).
  • the information indicating the interference cancellation mode is, for example, the first mode in which the interference cancellation processing is unnecessary, the second mode in which the UE 3 autonomously determines whether the interference cancellation processing is necessary, and the UE 3 is designated from the eNB 2 This is information indicating one of the third modes in which interference cancellation processing is performed on the signal.
  • the first mode may be referred to as “interference cancellation unnecessary mode”
  • the second mode may be referred to as “mobile device autonomous determination mode”
  • the third mode may be referred to as “base station designation mode”.
  • the information indicating the interference cancellation mode may be 1-bit flag information (may be referred to as a “mode flag” for convenience) as illustrated in FIG.
  • the mode flag is “NULL” indicating that the flag is not set, “0” indicating “mobile device autonomous determination mode”, and “1” indicating “base station designation mode”. Good.
  • the information indicating the data superposition pattern is, for example, information indicating whether DL signals addressed to UEs # 1 to # 3 are multiplexed in the power domain or in the code domain.
  • the information indicating the data superposition pattern may be 1-bit flag information (which may be referred to as “superimposition pattern flag” for convenience) as illustrated in FIG.
  • the superimposition pattern flag may indicate multiplexing in the “0” power domain, and may indicate multiplexing in the code domain with “1”.
  • the above two types of flags may be set to DL control signals and transmitted to UE # 1 to UE # 3, for example.
  • the control signal is an example of a signal that controls selection of a target signal to which interference suppression processing is applied in each UE 3 among a plurality of data signals multiplexed by NOMA.
  • a non-limiting example of a DL control signal for which a flag is set is a physical downlink control channel (PDCCH) signal.
  • the PDCCH is an example of a control channel that transmits a DL control signal.
  • eNB # 1 and # 2 may transmit data signals addressed to UE # 1 to UE # 3, respectively (processing P14).
  • eNB # 1 transmits the data signal addressed to UE # 1 and # 2 with the transmission pattern determined in process P12.
  • eNB # 2 transmits the data signal addressed to UE # 1 and # 3 with the transmission pattern determined in process P12.
  • the data signals transmitted by the eNBs # 1 and # 2 to the UE # 1 are the same data signal and are transmitted by JT-CoMP.
  • the UE 3 checks the mode flag (process P22).
  • the UE 3 performs signal processing (for example, demodulation and transmission) on the data signals received from the eNBs # 1 and # 2, respectively, without performing interference suppression processing. (Decoding) may be performed (process P31).
  • UE # 1 may combine data signals transmitted by JT-CoMP by eNB # 1 and # 2.
  • the UE 3 recognizes that it autonomously determines the data signal to which the interference suppression processing is applied among the received data signals (processing) P23).
  • UE3 checks the superimposition pattern flag of the received control signal (process P24). If the superposition pattern flag is “0” indicating superposition in the power domain, the UE 3 recognizes that the interference suppression process in the power domain is performed on the data signal to which the interference suppression process is applied.
  • the UE 3 has, for example, an interference signal with the maximum received power or an interference signal with the maximum received power among the received signals with the received power equal to or higher than a certain threshold.
  • the signal may be autonomously determined as a signal to which the interference suppression process is applied.
  • the UE 3 may perform signal processing (for example, demodulation and decoding) on the received data signal after suppressing the interference signal in the power domain (processing P25) (processing P31).
  • signal processing for example, demodulation and decoding
  • the UE 3 recognizes that the interference suppression process in the code area is performed on the data signal to which the interference suppression process is applied. (Process P26).
  • the UE 3 autonomously determines, for example, that the signal whose superimposition data amount is greater than or equal to the threshold is a signal to which the interference suppression process is applied. You can do it.
  • the signal whose amount of superimposed data is equal to or greater than a threshold is, for example, a signal whose number of flags “1” is equal to or greater than the threshold in the code matrix G code .
  • the UE 3 may perform signal processing (for example, demodulation and decoding) on the received data signal after suppressing the interference signal in the code domain (processing P26) (processing P31).
  • signal processing for example, demodulation and decoding
  • the UE 3 may recognize that the interference cancellation processing is applied to the data signal designated by the eNB 2 among the received data signals. (Process P27).
  • the designation of the data signal to which the interference suppression processing is applied in the UE 3 exemplarily indicates that the eNB 2 notifies the UE 3 of the identifier (ID), cell identifier (cell ID), pilot signal identifier (pilot ID), and the like of the eNB 2. It may be done at.
  • the UE 3 may recognize that the interference suppression process is applied to the data signal received from the transmission source identified by the notified identifier.
  • the notification of an identifier such as a cell ID addressed to the UE 3 from the eNB 2 may be exemplarily performed on the PDCCH.
  • an identifier such as a cell ID may be included in the PDCCH signal together with the above-described mode flag.
  • the identifier notified from the eNB 2 to the UE 3 and the identifier used by the UE 3 for identifying the interference removal target signal may be the same or different.
  • the eNB 2 may give the same identifier as the identifier notified to the UE 3 to the superimposed data.
  • eNB2 may notify pilot ID to UE3 and may give cell ID to superimposition data, for example.
  • the pilot ID and the cell ID may be associated with each other.
  • Information indicating the association between the pilot ID and the cell ID may be shared between the eNB 2 and the UE 3. For example, information indicating the association may be stored in the storage unit 27 of the eNB 2 described later in FIG. 14 or may be stored in the storage unit 36 of the UE 3.
  • UE3 may check the superposition pattern flag of the control signal received in process P21 (process P28). If the superposition pattern flag is “0” indicating superposition in the power domain, the UE 3 may recognize that the SIC in the power domain is performed on the data signal to which the interference suppression process is applied.
  • the UE 3 suppresses the interference signal specified by the eNB 2 in the power domain (processing P29), and then performs signal processing (for example, processing of the received data signal) , Demodulation and decoding) (process P31).
  • the UE 3 may recognize that the interference suppression processing in the code region is performed on the data signal to which the interference suppression processing is applied. .
  • the UE 3 suppresses the interference signal specified by the eNB 2 in the code domain (processing P30), and performs signal processing (for example, processing of the received data signal) , Demodulation and decoding) (process P31).
  • eNB2 may transmit information of code matrix G code to UE3 together with notification of the superposition pattern flag in both designation by eNB2 and autonomous determination by UE3. . Since the code matrix G code can be different for each superposition, the UE 3 does not need to hold the information of the code matrix G code in advance.
  • the eNB 2 exemplarily includes an operation mode flag determination unit 21, a data superimposition pattern determination unit 22, a flag setting unit 23, a data superposition unit 24, a signal processing unit 25, a radio processing unit 26, and A storage unit 27 may be provided.
  • the operation mode flag determination unit 21 exemplarily determines the interference cancellation mode described above with reference to FIG.
  • the data superposition pattern determination unit 22 illustratively determines the data superposition pattern described above with reference to FIG.
  • the flag setting unit 23 includes a mode flag corresponding to the interference removal mode determined by the operation mode flag determination unit 21 and a superposition pattern corresponding to the data superposition pattern determined by the data superposition pattern determination unit 22. And a flag are set in the DL control signal.
  • the data superimposing unit 24 illustratively superimposes data signals addressed to the plurality of UEs 3 according to the data superimposing pattern determined by the data superimposing pattern determining unit 22.
  • the signal processing unit 25 illustratively performs DL and UL signal processing.
  • a digital signal processor DSP may be applied to the signal processing unit 25.
  • the DL transmission signal may include a DL control signal and a data signal addressed to the UE 3.
  • the UL reception signal may include a UL control signal and a data signal transmitted by the UE 3.
  • the UL control signal may exemplarily include the above-described radio quality information.
  • the DL signal processing may include, for example, DL transmission signal generation processing, DL transmission signal encoding processing, modulation processing, and the like.
  • the data superimposing unit 24 may superimpose a plurality of data signals generated by the generating process. An encoding process and a modulation process may be applied to the data signal superimposed by the data superimposing unit 24.
  • the flag setting unit 23 may set the above-described mode flag and superimposition pattern flag in the DL control signal generated by the generation process.
  • the UL signal processing may illustratively include demodulation processing and decoding processing.
  • the radio quality information obtained by signal processing the UL control signal may be provided to the data superposition pattern determination unit 22.
  • the data superimposition pattern determination unit 22 can select and determine a transmission pattern (for example, process P12 in FIG. 10) based on the given wireless quality information.
  • the radio processing unit 26 for example, upconverts the DL transmission signal input from the signal processing unit 25 into a radio signal and transmits the radio signal to the UE 3. Further, the radio processing unit 26 illustratively down-converts a UL radio signal received from the UE 3 and inputs the UL radio signal to the signal processing unit 25. One or both of the DL transmission radio signal and the UL reception radio signal may be appropriately amplified in the radio processing unit 26.
  • the data superimposing unit 24, the signal processing unit 25, and the radio processing unit 26 are an example of a transmission unit that multiplexes and transmits a plurality of data signals addressed to a plurality of UEs 3 by NOMA, focusing on DL transmission processing.
  • Multiplexing by NOMA may be understood to mean multiplexing a plurality of data signals with different power or different codes at the same frequency and time.
  • the storage unit 27 exemplarily stores various types of information such as information used for controlling the operations of the above-described units 21 to 26 and information used for DL transmission processing and UL reception processing, respectively. It's okay.
  • a random access memory (RAM) or a read only memory (ROM) may be applied to the storage unit 27.
  • the ROM may be a flash memory.
  • the operation mode flag determination unit 21, the data superposition pattern determination unit 22, and the flag setting unit 23 may be regarded as an example of the control unit 20 in the eNB 2.
  • any one or more of the operation mode flag determination unit 21, the data superimposition pattern determination unit 22, the flag setting unit 23, and the data superimposition unit 24 may be provided in the signal processing unit 25.
  • the control unit 20 is an example of a control unit that transmits to each UE 3 a control signal that controls selection of a target signal to which interference suppression processing is applied in each UE 3 among a plurality of data signals multiplexed by NOMA. Also good.
  • a central processing unit may be used as the control unit 20, or alternatively or additionally, an integrated circuit such as a micro processing unit (MPU) (Integrated Circuit, IC)
  • MPU micro processing unit
  • IC Integrated Circuit
  • DSP digital signal processor
  • CPU, MPU, DSP and the like are examples of a processor circuit or a processor device having a computing capability.
  • a processor circuit or processor device with computing power may be referred to as a “computer” for convenience.
  • Some or all of the functions of the operation mode flag determining unit 21, the data superimposing pattern determining unit 22, the flag setting unit 23, and the data superimposing unit 24 may be realized by a “computer” such as a CPU, MPU, or DSP. . Alternatively, some or all of the functions of these units 21 to 24 may be realized using a programmable logic device including a “computer”.
  • a “programmable logic device” is field programmable gate array (FPGA).
  • the storage unit 27 may store programs and data that embody part or all of the functions of the operation mode flag determination unit 21, the data superimposition pattern determination unit 22, the flag setting unit 23, and the data superimposition unit 24.
  • the “program” may be referred to as “software” or “application”.
  • a part or all of the functions of the units 21 to 24 may be realized by a “computer” such as a CPU, MPU, or DSP reading and operating a program stored in the storage unit 27.
  • a “computer” such as a CPU, MPU, or DSP reading and operating a program stored in the storage unit 27.
  • the UE 3 may include, for example, a radio processing unit 31, an operation mode determination unit 32, a superposition pattern determination unit 33, an interference signal removal unit 34, a signal processing unit 35, and a storage unit 36.
  • the radio processing unit 31 illustratively up-converts the UL transmission signal input from the signal processing unit 35 into a radio signal and transmits the radio signal to the eNB 2. Further, the radio processing unit 31 illustratively down-converts a DL radio signal received from the eNB 2 and inputs the DL radio signal to the signal processing unit 35. One or both of the UL transmission radio signal and the DL reception radio signal may be appropriately amplified in the radio processing unit 31.
  • the signal processor 35 illustratively performs DL and UL signal processing.
  • a DSP may be applied to the signal processing unit 35.
  • the DL received signal may include a DL control signal and a data signal transmitted by the eNB 2.
  • the UL transmission signal may include a UL control signal and a data signal transmitted to the eNB 2.
  • the UL control signal may include the wireless quality information described above.
  • the DL signal processing may illustratively include demodulation processing and decoding processing.
  • the signal processing unit 35 may measure the above-described radio quality information based on a reference signal or a pilot signal obtained by DL signal processing.
  • the above-described mode flag and superposition pattern flag may be set in the control signal obtained by DL signal processing.
  • the mode flag may be provided to the operation mode determination unit 32, and the superimposition pattern flag may be provided to the superposition pattern determination unit 33.
  • the UL signal processing may include, for example, UL transmission signal generation processing, UL transmission signal encoding processing, modulation processing, and the like.
  • the radio processing unit 31 and the signal processing unit 35 focusing on DL reception processing, receive a multiplexed data signal from the eNB 2 that multiplexes and transmits a plurality of data signals addressed to a plurality of UEs 3 using NOMA. It may be considered that this corresponds to an example.
  • the operation mode determination unit 32 illustratively performs the mode determination process (P22) described above with reference to FIG. 11 based on the mode flag given from the signal processing unit 35.
  • the result of the mode determination process may be given to the interference signal removal unit 35, for example.
  • the superimposition pattern determination unit 33 illustratively performs the superimposition pattern determination process (P24 and P28) described above with reference to FIG. 11 based on the superimposition pattern flag given from the signal processing unit.
  • the result of the superimposition pattern determination process may be given to the interference signal removal unit 34, for example.
  • the interference signal removal unit 34 may, for example, selectively apply interference suppression processing to a data signal multiplexed in the power domain or code domain by NOMA.
  • the interference signal removal unit 34 selectively performs interference suppression processing according to the determination processing results given from the determination units 32 and 32, for example, the processing P25, P26, P29, or P30 described in FIG. It's okay.
  • the storage unit 36 exemplarily stores various types of information such as information used for controlling the operations of the above-described units 31 to 36 and information used for UL transmission processing and DL reception processing, respectively. It's okay.
  • a semiconductor memory such as a RAM or a ROM may be applied to the storage unit 36.
  • the ROM may be a flash memory.
  • the operation mode determination unit 32 and the superimposition pattern determination unit 33 may be regarded as an example of the control unit 30 in the UE 3.
  • any one or more of the operation mode determination unit 32, the superimposition pattern determination unit 33, and the interference signal removal unit 34 may be included in the signal processing unit 35.
  • the control unit 30 is an example of a control unit that controls the selective application of the interference suppression process in the interference signal removal unit 34 according to the control signal that is received from the eNB 2 and controls the selection of the target signal to which the interference suppression process is applied. It may be understood that it corresponds to.
  • a CPU may be used, or alternatively or additionally, an integrated circuit (IC) such as an MPU or a DSP may be used.
  • IC integrated circuit
  • CPU, MPU, DSP and the like are examples of a processor circuit or a processor device having a computing capability.
  • a processor circuit or processor device with computing power may be referred to as a “computer” for convenience.
  • Part or all of the functions of the operation mode determination unit 32 and the superimposition pattern determination unit 33 may be realized by a “computer” such as a CPU, MPU, or DSP. Alternatively, some or all of the functions of the operation mode determination unit 32 and the superimposition pattern determination unit 33 may be realized using a programmable logic device (eg, FPGA) including a “computer”.
  • a programmable logic device eg, FPGA
  • the storage unit 36 stores a program (may be referred to as “software” or “application”) or data that realizes part or all of the functions of the operation mode determination unit 32 and the superimposition pattern determination unit 33. It's okay.
  • Some or all of the functions of the operation mode determination unit 32 and the superimposition pattern determination unit 33 are realized by a “computer” such as a CPU, MPU, or DSP reading and operating a program stored in the storage unit 36. Good.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un système de communication sans fil (1) dans lequel une station de base (2) peut multiplexer et transmettre une pluralité de signaux de données adressés à une pluralité de terminaux sans fil (3), à la même fréquence et au même moment, la pluralité multiplexée de signaux de données ayant des niveaux de puissance différents ou comprenant différents codes. En outre, la station de base (2) peut transmettre, à chaque terminal sans fil (3), un signal de commande pour commander la sélection, parmi la pluralité multiplexée de signaux de données, d'un signal cible auquel un processus de suppression d'interférence doit être appliqué par le terminal sans fil (3). En fonction du signal de commande reçu de la station de base (2), chaque terminal sans fil (3) peut commander la sélection d'un signal de données auquel le processus de suppression d'interférence doit être appliqué.
PCT/JP2016/068531 2016-06-22 2016-06-22 Système de communication sans fil, station de base, et terminal sans fil WO2017221352A1 (fr)

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