WO2016190156A1 - Station de base et terminal d'utilisateur - Google Patents

Station de base et terminal d'utilisateur Download PDF

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Publication number
WO2016190156A1
WO2016190156A1 PCT/JP2016/064511 JP2016064511W WO2016190156A1 WO 2016190156 A1 WO2016190156 A1 WO 2016190156A1 JP 2016064511 W JP2016064511 W JP 2016064511W WO 2016190156 A1 WO2016190156 A1 WO 2016190156A1
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WIPO (PCT)
Prior art keywords
srs
pusch
user terminal
control unit
transmission
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PCT/JP2016/064511
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English (en)
Japanese (ja)
Inventor
直久 松本
宏行 浦林
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京セラ株式会社
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Publication of WO2016190156A1 publication Critical patent/WO2016190156A1/fr

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    • 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
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present invention relates to a base station and a user terminal used in a mobile communication system.
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • it is considered to use not only a frequency band (licensed band) for which an operator is licensed but also a frequency band (unlicensed band) that does not require a license for LTE communication.
  • a base station receives PUSCH and SRS from a user terminal in an unlicensed band.
  • the base station includes a control unit that allocates frequency resources for the PUSCH to the user terminal.
  • the SRS is transmitted in the same frequency band as the PUSCH when the PUSCH is transmitted.
  • the said control part changes the frequency resource for said PUSCH allocated to the said user terminal for every transmission opportunity of the said SRS.
  • a base station receives PUSCH and SRS from a user terminal in an unlicensed band.
  • the base station includes a control unit that sets a gap section between the PUSCH and the SRS.
  • the gap section is a section for a user terminal to monitor the unlicensed band and determine whether or not to transmit the SRS.
  • the control unit controls the allocation of the PUSCH so that the time length of the gap section is changed.
  • a user terminal transmits an SRS to a base station.
  • the user terminal includes a first mode in which the SRS transmission timing is fixed to a final symbol period of a subframe, and a second mode in which transmission of the SRS in a symbol period different from the final symbol period is allowed.
  • a control unit that transmits the SRS in a mode selected from among the modes. The control unit transmits the SRS in the licensed band in the first mode, and transmits the SRS in the unlicensed band in the second mode.
  • a base station includes a receiving unit that receives SRSs configured from subcarriers arranged in a comb-tooth shape in an unlicensed band from a user terminal, and frequencies of subcarriers that configure the SRSs.
  • a control unit that transmits setting information for designating the frequency interval to the user terminal so that the interval is changed.
  • a sounding reference signal (SRS) is introduced as a reference signal for sounding (measuring) uplink channel quality, and the UE 100 can periodically transmit SRS.
  • SRS sounding reference signal
  • a listen-before-talk (LBT) procedure is required in order to avoid interference with another system (such as a wireless LAN) different from the LTE system or another operator's LTE system.
  • LBT listen-before-talk
  • the LBT procedure monitors the frequency in the unlicensed band, it confirms whether the frequency is vacant based on the received power (interference power), and if it is confirmed that it is vacant (clear channel) This procedure uses this frequency only.
  • the base station includes a receiving unit that receives PUSCH and SRS from a user terminal in an unlicensed band, and a control unit that allocates frequency resources for the PUSCH to the user terminal.
  • the SRS is transmitted in the same frequency band as the PUSCH when the PUSCH is transmitted.
  • the said control part changes the frequency resource for said PUSCH allocated to the said user terminal for every transmission opportunity of the said SRS.
  • the base station includes a receiving unit that receives PUSCH and SRS from a user terminal in an unlicensed band, and a control unit that sets a gap section between the PUSCH and the SRS.
  • the gap section is a section for a user terminal to monitor the unlicensed band and determine whether or not to transmit the SRS.
  • the control unit controls the allocation of the PUSCH so that the time length of the gap section is changed.
  • the user terminal is different from the final symbol period in the transmission unit that transmits the SRS to the base station, the first mode in which the transmission timing of the SRS is fixed to the final symbol period of the subframe, and A second mode in which transmission of the SRS in a symbol interval is allowed, and a control unit that transmits the SRS in a mode selected from the second mode.
  • the control unit transmits the SRS in the licensed band in the first mode, and transmits the SRS in the unlicensed band in the second mode.
  • the base station includes, in an unlicensed band, a reception unit that receives an SRS configured using subcarriers arranged in a comb shape from a user terminal, and a frequency of the subcarrier that configures the SRS.
  • a control unit that transmits setting information for designating the frequency interval to the user terminal so that the interval is changed.
  • FIG. 1 is a diagram illustrating a configuration of an LTE system.
  • the LTE system includes a UE (User Equipment) 100, an E-UTRAN (Evolved UMTS Terrestrial Radio Access Network) 10, and an EPC (Evolved Packet Core) 20.
  • UE User Equipment
  • E-UTRAN Evolved UMTS Terrestrial Radio Access Network
  • EPC Evolved Packet Core
  • the UE 100 corresponds to a user terminal.
  • the UE 100 is a mobile communication device, and performs radio communication with a cell (serving cell).
  • the configuration of the UE 100 will be described later.
  • the E-UTRAN 10 corresponds to a radio access network.
  • the E-UTRAN 10 includes an eNB 200 (evolved Node-B).
  • the eNB 200 corresponds to a base station.
  • the eNB 200 is connected to each other via the X2 interface. The configuration of the eNB 200 will be described later.
  • the eNB 200 manages one or a plurality of cells and performs radio communication with the UE 100 that has established a connection with the own cell.
  • the eNB 200 has a radio resource management (RRM) function, a routing function of user data (hereinafter simply referred to as “data”), a measurement control function for mobility control / scheduling, and the like.
  • RRM radio resource management
  • Cell is used as a term indicating a minimum unit of a radio communication area, and is also used as a term indicating a function of performing radio communication with the UE 100.
  • the EPC 20 corresponds to a core network.
  • the EPC 20 includes an MME (Mobility Management Entity) / S-GW (Serving-Gateway) 300.
  • MME Mobility Management Entity
  • S-GW Serving-Gateway
  • MME performs various mobility control etc. with respect to UE100.
  • the S-GW performs data transfer control.
  • the MME / S-GW 300 is connected to the eNB 200 via the S1 interface.
  • the E-UTRAN 10 and the EPC 20 constitute a network.
  • FIG. 2 is a protocol stack diagram of a radio interface in the LTE system.
  • the radio interface protocol is divided into the first to third layers of the OSI reference model, and the first layer is a physical (PHY) layer.
  • the second layer includes a MAC (Medium Access Control) layer, an RLC (Radio Link Control) layer, and a PDCP (Packet Data Convergence Protocol) layer.
  • the third layer includes an RRC (Radio Resource Control) layer.
  • the physical layer performs encoding / decoding, modulation / demodulation, antenna mapping / demapping, and resource mapping / demapping. Data and control information are transmitted between the physical layer of the UE 100 and the physical layer of the eNB 200 via a physical channel.
  • the MAC layer performs data priority control, retransmission processing by hybrid ARQ (HARQ), random access procedure, and the like. Data and control information are transmitted between the MAC layer of the UE 100 and the MAC layer of the eNB 200 via a transport channel.
  • the MAC layer of the eNB 200 includes a scheduler that determines uplink / downlink transport formats (transport block size (TBS), modulation / coding scheme (MCS)) and resource blocks allocated to the UE 100.
  • TBS transport block size
  • MCS modulation / coding scheme
  • the RLC layer transmits data to the RLC layer on the receiving side using the functions of the MAC layer and the physical layer. Data and control information are transmitted between the RLC layer of the UE 100 and the RLC layer of the eNB 200 via a logical channel.
  • the PDCP layer performs header compression / decompression and encryption / decryption.
  • the RRC layer is defined only in the control plane that handles control information. Messages for various settings (RRC messages) are transmitted between the RRC layer of the UE 100 and the RRC layer of the eNB 200.
  • the RRC layer controls the logical channel, the transport channel, and the physical channel according to establishment, re-establishment, and release of the radio bearer.
  • RRC connection When there is a connection (RRC connection) between the RRC of the UE 100 and the RRC of the eNB 200, the UE 100 is in the RRC connected state, and otherwise, the UE 100 is in the RRC idle state.
  • the NAS (Non-Access Stratum) layer located above the RRC layer performs session management and mobility management.
  • FIG. 3 is a configuration diagram of a radio frame used in the LTE system.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Division Multiple Access
  • the radio frame is composed of 10 subframes arranged in the time direction.
  • Each subframe is composed of two slots arranged in the time direction.
  • the length of each subframe is 1 ms, and the length of each slot is 0.5 ms.
  • Each subframe includes a plurality of resource blocks (RB) in the frequency direction and includes a plurality of symbols in the time direction.
  • Each resource block includes a plurality of subcarriers in the frequency direction.
  • One symbol and one subcarrier constitute one resource element (RE).
  • a frequency resource can be specified by a resource block, and a time resource can be specified by a subframe (or slot).
  • the section of the first few symbols of each subframe is an area mainly used as a physical downlink control channel (PDCCH) for transmitting downlink control information (DCI).
  • the remaining part of each subframe is an area that can be used mainly as a physical downlink shared channel (PDSCH) for transmitting downlink data.
  • PDCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • ENB200 transmits DCI to UE100 using PDCCH, and transmits downlink data to UE100 using PDSCH.
  • the DCI carried by the PDCCH includes uplink scheduling information, downlink scheduling information, and a TPC command party.
  • the uplink scheduling information is scheduling information (UL grant) related to uplink radio resource allocation
  • the downlink scheduling information is scheduling information related to downlink radio resource allocation.
  • the TPC command is information instructing increase / decrease in uplink transmission power.
  • the eNB 200 includes, in the DCI, the CRC scrambled with the identifier (RNTI: Radio Network Temporary ID) of the destination UE 100 in order to identify the destination UE 100 of the DCI.
  • RTI Radio Network Temporary ID
  • Each UE 100 performs blind decoding (blind decoding) on the PDCCH by detecting the DCI destined for the own UE by descrambling the CRC bits with the RNTI of the own UE, and detects the DCI addressed to the own UE.
  • the PDSCH carries downlink data using downlink radio resources (resource blocks) indicated by the downlink scheduling information.
  • both end portions in the frequency direction in each subframe are regions mainly used as physical uplink control channels (PUCCH) for transmitting uplink control information.
  • the remaining part of each subframe is an area that can be used as a physical uplink shared channel (PUSCH) mainly for transmitting uplink data.
  • the UE 100 basically transmits uplink control information (UCI) to the eNB 200 using the PUCCH, and transmits uplink data to the eNB 200 using the PUSCH.
  • UCI uplink control information
  • the eNB 200 In the uplink, in order to obtain a high improvement effect by frequency domain scheduling, the eNB 200 needs to grasp channel quality of a wide frequency bandwidth for each UE 100.
  • a sounding reference signal SRS
  • the eNB 200 estimates the channel quality for each predetermined frequency band based on the SRS transmitted from the UE 100 for each predetermined frequency band.
  • 4 and 5 are diagrams for explaining the SRS.
  • a subframe (uplink subframe) is composed of two slots.
  • each slot is composed of seven SC-FDMA symbols, and a demodulation reference signal (DMRS) used for PUSCH demodulation is arranged in the fourth SC-FDMA symbol. Is done.
  • the SRS can be arranged in the last symbol of the subframe.
  • An SRS sequence is defined by one cyclic shift amount and one basic sequence.
  • a Zadoff-Chu sequence is applied to the basic sequence.
  • ENB200 transmits the setting information of SRS to UE100 by RRC signaling.
  • UE100 transmits SRS to eNB200 based on the setting information of SRS.
  • the SRS setting information includes a minimum SRS transmission period and an offset indicating a subframe in which the SRS can be transmitted. The last symbol in a subframe in which SRS transmission is possible is dedicated to SRS and cannot be used for PUSCH transmission. Further, the SRS setting information includes the SRS frequency bandwidth. When the SRS frequency band is narrower than the entire uplink frequency band, wideband sounding is possible by frequency hopping that hops the SRS transmission frequency band for each subframe.
  • the LTE system uses not only a licensed band for which an operator is licensed but also an unlicensed band that does not require a license for LTE communication. Specifically, the unlicensed band can be accessed with the assistance of the licensed band. Such a mechanism is called LAA (Licensed-Assisted Access).
  • LAA Licensed-Assisted Access
  • FIG. 6 is a diagram for explaining LAA. As illustrated in FIG. 6, the eNB 200 manages a cell # 1 operated in a licensed band and a cell # 2 operated in an unlicensed band. In FIG. 6, an example in which the cell # 1 is a macro cell and the cell # 2 is a small cell is illustrated, but the cell size is not limited to this.
  • UE 100 is located in the overlapping area of cell # 1 and cell # 2.
  • UE100 sets cell # 2 as a secondary cell (SCell), setting cell # 1 as a primary cell (PCell), and performs communication by a carrier aggregation (CA).
  • SCell secondary cell
  • PCell primary cell
  • CA carrier aggregation
  • the UE 100 performs uplink communication and downlink communication with the cell # 1, and performs uplink communication and downlink communication with the cell # 2.
  • the UE 100 is provided with unlicensed band radio resources in addition to the licensed band radio resources, so that throughput can be improved.
  • DCI resource allocation information
  • eNB200 notifies UE100 via a licensed band, or notifies UE100 via an unlicensed band.
  • uplink communication in cell # 2 (unlicensed band) will be mainly described.
  • an LBT procedure is required in order to avoid interference with another system (such as a wireless LAN) different from the LTE system or another operator's LTE system.
  • an LBT procedure is required in order to avoid interference with another system (such as a wireless LAN) different from the LTE system or another operator's LTE system.
  • the LBT procedure monitors the frequency in the unlicensed band, it confirms whether the frequency is vacant based on the received power (interference power), and if it is confirmed that it is vacant (clear channel) This procedure uses this frequency only.
  • LBT systems There are two types of LBT systems: an FBE (Frame Based Equipment) system and an LBE (Load Based Equipment) system.
  • the FBE method is a method in which timing is fixed.
  • the LBE method is a method whose timing is not fixed.
  • FIG. 7 is a block diagram of the UE 100. As illustrated in FIG. 7, the UE 100 includes a reception unit 110, a transmission unit 120, and a control unit 130.
  • the receiving unit 110 performs various types of reception under the control of the control unit 130.
  • the receiving unit 110 includes an antenna and a receiver.
  • the receiver converts a radio signal received by the antenna into a baseband signal (received signal) and outputs the baseband signal to the control unit 130.
  • the receiving unit 110 may include a first receiver that receives a radio signal in a licensed band and a second receiver that receives a radio signal in an unlicensed band.
  • the transmission unit 120 performs various transmissions under the control of the control unit 130.
  • the transmission unit 120 includes an antenna and a transmitter.
  • the transmitter converts the baseband signal (transmission signal) output from the control unit 130 into a radio signal and transmits it from the antenna.
  • the transmission unit 120 may include a first transmitter that transmits a radio signal in a licensed band and a second transmitter that transmits a radio signal in an unlicensed band.
  • the control unit 130 performs various controls in the UE 100.
  • the control unit 130 includes a processor and a memory.
  • the memory stores a program executed by the processor and information used for processing by the processor.
  • the processor includes a baseband processor that performs modulation / demodulation and encoding / decoding of the baseband signal, and a CPU (Central Processing Unit) that executes various processes by executing programs stored in the memory.
  • the processor may include a codec that performs encoding / decoding of an audio / video signal.
  • the processor executes various processes described later and various communication protocols described above.
  • FIG. 8 is a block diagram of the eNB 200. As illustrated in FIG. 8, the eNB 200 includes a transmission unit 210, a reception unit 220, a control unit 230, and a backhaul communication unit 240.
  • the transmission unit 210 performs various transmissions under the control of the control unit 230.
  • the transmission unit 210 includes an antenna and a transmitter.
  • the transmitter converts the baseband signal (transmission signal) output from the control unit 230 into a radio signal and transmits it from the antenna.
  • the transmission unit 210 may include a first transmitter that transmits a radio signal in the licensed band and a second transmitter that transmits a radio signal in the unlicensed band.
  • the receiving unit 220 performs various types of reception under the control of the control unit 230.
  • the receiving unit 220 includes an antenna and a receiver.
  • the receiver converts a radio signal received by the antenna into a baseband signal (received signal) and outputs the baseband signal to the control unit 230.
  • the receiving unit 220 may include a first receiver that receives radio signals in the licensed band and a second receiver that receives radio signals in the unlicensed band.
  • the control unit 230 performs various controls in the eNB 200.
  • the control unit 230 includes a processor and a memory.
  • the memory stores a program executed by the processor and information used for processing by the processor.
  • the processor includes a baseband processor that performs modulation / demodulation and encoding / decoding of the baseband signal, and a CPU (Central Processing Unit) that executes various processes by executing programs stored in the memory.
  • the processor executes various processes described later and various communication protocols described above.
  • the backhaul communication unit 240 is connected to the neighboring eNB 200 via the X2 interface, and is connected to the MME / S-GW 300 via the S1 interface.
  • the backhaul communication unit 240 is used for communication performed on the X2 interface, communication performed on the S1 interface, and the like.
  • the eNB 200 can cause the UE 100 to periodically transmit SRS.
  • the LBT procedure is required in the unlicensed band.
  • UE100 performs LBT about the transmission frequency band of SRS, and can transmit SRS only when it is confirmed that the said transmission frequency band is vacant (namely, when LBT succeeds).
  • performing the LBT only for transmitting the SRS leads to an increase in the processing load of the UE 100.
  • ENB200 which concerns on 1st Embodiment receives PUSCH and SRS from UE100 in an unlicensed band.
  • eNB200 allocates the frequency resource (resource block) for PUSCH to UE100.
  • the SRS is transmitted in the same frequency band as the PUSCH along with the transmission of the PUSCH.
  • FIG. 9 is a diagram for explaining the operation according to the first embodiment.
  • the UE 100 performs LBT before transmission of the PUSCH allocated from the eNB 200, and transmits PUSCH when the LBT is successful. And UE100 transmits SRS in the same frequency band as this PUSCH with transmission of PUSCH. In other words, the UE 100 transmits the SRS immediately after transmitting the PUSCH in the allocated frequency band. For example, PUSCH transmission and SRS transmission are performed in the same subframe.
  • the UE 100 can also transmit an SRS simply by performing an LBT for PUSCH transmission, and thus avoiding an increase in processing load on the UE 100 due to the LBT. it can.
  • such a method has room for improvement in that channel quality over a wide frequency bandwidth can be grasped.
  • the eNB 200 changes the PUSCH frequency resource to be assigned to the UE 100 for each SRS transmission opportunity.
  • the SRS transmission opportunity is a transmission opportunity determined according to the SRS transmission cycle. Thereby, since the transmission frequency band of SRS is changed suitably, eNB200 can grasp the channel quality of a wide frequency bandwidth.
  • the eNB 200 selects a frequency resource allocated to another UE # 2 before the PUSCH allocation timing of the UE # 1 as a PUSCH frequency resource allocated to the UE # 1. . Moreover, eNB200 selects the frequency resource allocated to other UE # 1 before the allocation timing of PUSCH of UE # 2 as the frequency resource for PUSCH allocated to UE # 2.
  • the eNB 200 continuously allocates the same frequency resource to a plurality of UEs under its own cell (unlicensed band cell). Assuming that the radio environments of the plurality of UEs are the same, a frequency band in which one UE has succeeded in LBT is likely to cause other UEs to succeed in LBT. Therefore, the success rate of LBT can be increased by using the PUSCH allocation method as shown in FIG. 9B.
  • the eNB 200 may allocate frequency resources for PUSCH to the UE 100 according to the hopping pattern of SRS. Since the eNB 200 knows the SRS hopping pattern, the PUSCH can be assigned to the SRS transmission frequency band. Thereby, it is possible to cope with the case where frequency hopping is applied to the transmission of the SRS.
  • ENB200 which concerns on 2nd Embodiment receives PUSCH and SRS from UE100 in an unlicensed band.
  • the eNB 200 sets a gap section between PUSCH and SRS.
  • the gap section is a section for the UE 100 to monitor the unlicensed band and determine whether SRS transmission is possible.
  • the gap section is an assignment prohibition section (guard section) for the UE 100 to perform LBT for SRS.
  • FIG. 10 is a diagram for explaining an operation according to the second embodiment.
  • the eNB 200 sets a gap section between the PUSCH and the SRS.
  • the gap section has a time length corresponding to one or a plurality of symbols between the last symbol of PUSCH and the last symbol of the subframe.
  • ENB 200 controls PUSCH allocation so that the time length of the gap section is changed.
  • the gap section is variable, for example, within a range of 1 symbol to 3 symbols.
  • the eNB 200 adjusts the final symbol position of the PUSCH according to the time length of the gap section.
  • ENB200 judges the success rate of LBT for SRS based on the reception status of SRS from UE100. That is, when the SRS set in the UE 100 cannot be received, it is determined that the LBT before the SRS transmission has failed. On the other hand, when the SRS set in the UE 100 can be received, it is determined that the LBT before the SRS transmission is successful. In this way, the success rate of the LBT for SRS is determined.
  • the eNB 200 extends the gap interval in order to improve the success rate of the LBT.
  • the eNB 200 shortens the gap interval in order to improve the PUSCH resource utilization efficiency.
  • the eNB 200 sets and changes the gap section.
  • eNB200 transmits the information based on the time length of a gap area to UE100 in a self-cell.
  • the information based on the time length of the gap section may be the number of symbols in the gap section or information indicating the final symbol position of the PUSCH.
  • ENB200 may transmit the information based on the time length of a gap area to UE100 by DCI (UL grant). That is, when assigning the PUSCH to the UE 100, the eNB 200 notifies the UE 100 of the final symbol position of the PUSCH. The UE 100 terminates PUSCH transmission at the final symbol position of the PUSCH.
  • DCI UL grant
  • the eNB 200 may transmit information based on the time length of the gap section to the UE 100 by RRC signaling.
  • the eNB 200 may include information based on the time length of the gap section in an SIB (System Information Block) that is broadcast information.
  • SIB System Information Block
  • UE100 may determine the start timing of LBT for SRS by grasping
  • the eNB 200 may transmit DCI or RRC signaling to the UE 100 within the licensed band, or may transmit to the UE 100 within the unlicensed band.
  • UE100 which concerns on 3rd Embodiment transmits SRS to eNB200.
  • UE 100 selects between a first mode in which SRS transmission timing is fixed to the last symbol period of the subframe and a second mode in which SRS transmission is allowed in a symbol period different from the last symbol period.
  • SRS is transmitted according to the selected mode.
  • the UE 100 transmits the SRS in the first mode in the licensed band, and transmits the SRS in the second mode in the unlicensed band. Thereby, in an unlicensed band, SRS can be transmitted immediately after LBT succeeds, without waiting for the last symbol area of a sub-frame.
  • the eNB 200 may transmit to the UE 100 information indicating in which range the transmission of the SRS is allowed in the second mode.
  • the eNB 200 may transmit DCI or RRC signaling including the information to the UE 100 in the licensed band, or may transmit to the UE 100 in the unlicensed band.
  • the UE100 may transmit the notification signal for notifying the transmission start of SRS in the 2nd mode before transmission of SRS (immediately before transmission).
  • the eNB 200 receives the notification signal, the eNB 200 can grasp that the SRS is transmitted from the UE 100.
  • the notification signal is transmitted in the symbol period immediately before the SRS transmission symbol period.
  • the notification signal may be a signal having a time length less than one symbol period.
  • ENB200 which concerns on 4th Embodiment receives SRS comprised using the subcarrier arrange
  • eNB200 transmits the setting information which designates the said frequency interval to UE100 so that the frequency interval of the subcarrier which comprises SRS may be changed.
  • the setting information is transmitted by, for example, RRC signaling.
  • the maximum multiplexing number by D-FDMA is two.
  • the maximum multiplexing number by D-FDMA can be increased by extending the interval between the comb teeth. Note that multiplexing other than comb teeth (specifically, multiplexing by series) is difficult to support if the transmission timing is shifted.
  • PUSCH when PUSCH is also arranged in a comb shape and transmitted, it is multiplexed with 1) the interval of the comb teeth of SRS, or 2) More users with SRS by changing the interval of comb teeth between SRS and PUSCH Can be multiplexed.
  • the eNB 200 can grasp the channel quality in a single transmission / reception of SRS by transmitting SRS to a plurality of UEs 100 over a wide frequency bandwidth.
  • the eNB 200 can grasp the channel quality in a single transmission / reception of SRS by transmitting SRS to a plurality of UEs 100 over a wide frequency bandwidth.
  • the number of UEs that can transmit SRS at the same timing and the same frequency band can be increased, and the channel quality can be grasped efficiently.
  • the number of SRS transmissions of the UE 100 can be reduced, and the processing load on the UE 100 due to the LBT for SRS can be reduced.
  • ENB200 may change the space
  • the LTE system is exemplified as the mobile communication system.
  • the present invention is not limited to LTE systems.
  • the present invention may be applied to a system other than the LTE system.
  • the present invention is useful in the communication field.

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Abstract

La présente invention concerne, selon un mode de réalisation, une station de base munie d'une unité de réception servant à recevoir un PUSCH et un SRS dans une bande non couverte par une licence en provenance d'un terminal d'utilisateur, et d'une unité de commande servant à affecter une ressource de fréquence pour le PUSCH au terminal d'utilisateur. Le SRS est émis à l'intérieur de la même bande de fréquence que le PUSCH concomitamment à l'émission du PUSCH. La ressource de fréquence pour le PUSCH affectée au terminal d'utilisateur est convertie par l'unité de commande à chaque opportunité d'émission de SRS.
PCT/JP2016/064511 2015-05-22 2016-05-16 Station de base et terminal d'utilisateur WO2016190156A1 (fr)

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Title
NTT DOCOMO, INC.: "Discussion on issues related to UL transmission in LAA", 3GPP TSG- RAN WG1#80B RL-151958, XP050950251, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_80b/Docs/Rl-151958.zip> *
TEXAS INSTRUMENTS: "On Frequency Hopping for Aperiodic SRS Transmission", 3GPP TSG- RAN WG1#64 R1-110699, February 2011 (2011-02-01), XP050490509, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_64/Docs/R1-110699.zip> *
ZTE: "Remaining Issues on LAA UL", 3GPP TSG-RAN WG1#81 R1-152971, 16 May 2015 (2015-05-16), XP050971566, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_81/Docs/Rl-152971.zip> *

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