WO2016017327A1 - ユーザ端末、無線基地局及び無線通信方法 - Google Patents
ユーザ端末、無線基地局及び無線通信方法 Download PDFInfo
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- WO2016017327A1 WO2016017327A1 PCT/JP2015/068210 JP2015068210W WO2016017327A1 WO 2016017327 A1 WO2016017327 A1 WO 2016017327A1 JP 2015068210 W JP2015068210 W JP 2015068210W WO 2016017327 A1 WO2016017327 A1 WO 2016017327A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W16/14—Spectrum sharing arrangements between different networks
Definitions
- the present invention relates to a user terminal, a radio base station, and a radio communication method applicable to a next generation communication system.
- LTE Long Term Evolution
- SC-FDMA Single Carrier Frequency Division Multiple Access
- LTE-A LTE Advanced or LTE enhancement
- a small cell eg, a pico cell, a femto cell, etc.
- a macro cell having a wide coverage area with a radius of several kilometers.
- Heterogeneous Network is under consideration.
- use of carriers in different frequency bands as well as in the same frequency band between a macro cell (macro base station) and a small cell (small base station) is being studied.
- LTE-U LTE Unlicensed
- LAA License-Assisted Access
- LAA-LTE LAA-LTE
- a licensed band is a band that a specific operator is allowed to use exclusively, while an unlicensed band (also called a non-licensed band) can be set up with a radio station without being limited to a specific operator. It is a band.
- an unlicensed band for example, use of a 2.4 GHz band, a 5 GHz band that can use Wi-Fi (registered trademark) or Bluetooth (registered trademark), and a 60 GHz band that can use a millimeter wave radar is being studied. . Application of such an unlicensed band in a small cell is also under consideration.
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- the unlicensed band is not limited to use by a specific business operator.
- the unlicensed band is not limited to the use of a specific wireless system (for example, LTE, Wi-Fi, etc.). For this reason, there is a possibility that the frequency band used in the LAA of a certain operator overlaps with the frequency band used in the LAA or Wi-Fi of another operator.
- LTE-U LTE / LTE-A system
- APs and TPs wireless access points
- eNBs wireless base stations
- the LTE-U base station / user terminal may perform listening (sensing) before transmitting a signal and confirm whether other base stations / user terminals are communicating. It is being considered. This listening operation is also called LBT (Listen Before Talk).
- the present invention has been made in view of the above points, and suppresses a decrease in throughput of the entire system even when a user terminal performs LBT in a system that operates LTE / LTE-A in an unlicensed band. It is an object to provide a user terminal, a radio base station, and a radio communication method that can be used.
- a user terminal is a user terminal that can communicate with a radio base station using an unlicensed band, and performs channel state of the unlicensed band by performing LBT (Listen Before Talk) in a sensing subframe.
- LBT Listen Before Talk
- a reception processing unit that detects a predetermined subframe as the sensing subframe, and a transmission unit that transmits predetermined information related to PUSCH transmission in the sensing subframe based on the result of the LBT. It is characterized by having.
- the present invention in a system that operates LTE / LTE-A in an unlicensed band, even when a user terminal performs LBT, it is possible to suppress a decrease in throughput of the entire system.
- FIG. 1 shows an example of an operation mode of a radio communication system (LTE-U) that operates LTE in an unlicensed band.
- LTE-U radio communication system
- CA Carrier Aggregation
- DC Dual Connectivity
- SA Stand-Alone
- FIG. 1A shows a scenario in which carrier aggregation (CA) is applied using a license band and an unlicensed band.
- CA is a technology for integrating a plurality of frequency blocks (also referred to as component carrier (CC), carrier, cell, etc.) to increase the bandwidth.
- CC component carrier
- Each CC has, for example, a maximum bandwidth of 20 MHz, and when a maximum of five CCs are integrated, a wide band of maximum 100 MHz is realized.
- FIG. 1A shows a case where CA is applied to a macro cell and / or a small cell using a license band and a small cell using an unlicensed band.
- a scheduler of one radio base station controls scheduling of a plurality of CCs. From this, CA may be called CA in a base station (intra-eNB CA).
- a small cell using an unlicensed band may use a carrier dedicated to DL transmission (scenario 1A) or a TDD carrier (scenario 1B).
- a carrier used exclusively for DL transmission is also referred to as an additional downlink (SDL).
- SDL additional downlink
- FDD and / or TDD can be used.
- the license band and the unlicensed band can be configured to be transmitted and received from one transmission / reception point (for example, a radio base station) (co-located).
- the transmission / reception point for example, LTE / LTE-U base station
- the transmission / reception point can communicate with the user terminal using both the license band and the unlicensed band.
- a configuration (non-co-located) for transmitting and receiving license bands and unlicensed bands from different transmission / reception points for example, RRH (Remote Radio Head) connected to one radio base station and the other radio base station
- RRH Remote Radio Head
- FIG. 1B shows a scenario in which dual connectivity (DC) is applied using a license band and an unlicensed band.
- DC is the same as CA in that a plurality of CCs (or cells) are integrated to widen the bandwidth.
- CA presupposes that CC (or cells) are connected by ideal backhaul and that cooperative control with a very small delay time is possible, whereas in DC, delay time is ignored between cells. It is assumed that connection is not possible with non-ideal backhaul.
- DC cells are operated by different base stations, and user terminals communicate by connecting to cells (or CCs) of different frequencies operated by different base stations.
- CC cells
- a plurality of schedulers are provided independently, and the plurality of schedulers control the scheduling of one or more cells (CC) each having jurisdiction over.
- DC may be called CA between base stations (inter-eNB CA).
- Inter-eNB CA base stations
- Intra-eNB CA carrier aggregation
- FIG. 1B shows a case where a macro cell using a license band and a small cell using an unlicensed band apply DC.
- the small cell using the unlicensed band may use a carrier dedicated to DL transmission (scenario 2A) or a TDD carrier (scenario 2B).
- FDD and / or TDD can be used.
- a stand-alone in which a cell that operates LTE using an unlicensed band operates alone is applied.
- stand-alone means that communication with a terminal can be realized without applying CA or DC.
- the unlicensed band can be operated on the TDD carrier (scenario 3).
- FIG. 2 shows an example of an operation mode of a radio communication system (LTE-U) that operates LTE in an unlicensed band.
- the license band CC (macro cell) is the primary cell (PCell)
- the unlicensed band CC (small cell) is the secondary cell (SCell).
- the primary cell (PCell) is a cell that manages RRC connection and handover when performing CA / DC, and is a cell that requires UL transmission of data, feedback signals, and the like from user terminals.
- the primary cell is always set for both the upper and lower links.
- the secondary cell (SCell) is another cell that is set in addition to the primary cell when applying CA / DC.
- a secondary cell can set only a downlink, and can also set up-and-down link simultaneously.
- LAA Licensed-Assisted Access
- LAA-LTE LAA-LTE
- systems that operate LTE / LTE-A in an unlicensed band may be collectively referred to as “LAA”, “LTE-U”, “U-LTE”, and the like.
- the license band LTE and the unlicensed band LTE cooperate to communicate with the user terminal.
- a transmission point using a license band for example, a radio base station
- a transmission point using an unlicensed band are separated, they are connected by a backhaul link (for example, an optical fiber or an X2 interface).
- a backhaul link for example, an optical fiber or an X2 interface.
- the unlicensed band is not limited to use by a specific operator. For this reason, the frequency band used in the LTE-U of a certain operator may overlap with the frequency band used in another operator's LAA system or Wi-Fi system.
- CSMA / CA Carrier Sense Multiple Access / Collision based on LBT (Listen Before Talk) mechanism is used to avoid collision of transmission signals of user terminals, access points, etc. Avoidance
- CSMA / CA Carrier Sense Multiple Access / Collision based on LBT (Listen Before Talk) mechanism is used to avoid collision of transmission signals of user terminals, access points, etc. Avoidance
- listening CCA: Clear Channel Assessment
- TP Transmission Point
- AP Access Point
- STA Wi-Fi terminal
- an LBT is also required in an LTE / LTE-A system (for example, an LAA system) operated in an unlicensed band.
- LBT LBT
- interference between LAA and Wi-Fi can be avoided.
- interference between LAA systems can be avoided. Even in the case where control of connectable user terminals is performed independently for each operator who operates the LAA system, interference can be reduced without grasping each control content by the LBT.
- an LTE-U base station and / or a user terminal performs listening (LBT) before transmitting a signal in an unlicensed band cell, and performs other systems (eg, Wi-Fi) or another LAA. If no signal from the transmission point is detected, communication is performed in the unlicensed band. For example, when the received power measured by the LBT is equal to or less than a predetermined threshold, it is determined that the channel is in an idle state (LBT_idle) and transmission is performed. In other words, “the channel is free” means that the channel is not occupied by a predetermined system, and the channel is clear or the channel is free.
- a signal from another system or another LAA transmission point is detected as a result of listening, (1) transition to another carrier by DFS (Dynamic Frequency Selection), (2) transmission power control (TPC) ), (3) waiting (stopping) transmission, and the like.
- DFS Dynamic Frequency Selection
- TPC transmission power control
- LBT_busy the channel is busy
- the channel can be used only after a predetermined back-off time has elapsed. Note that the method of determining whether the channel is free / busy by LBT is not limited to this.
- FIG. 3 is an explanatory diagram showing the subject of LBT operation in a system that operates LTE / LTE-A in an unlicensed band.
- FIG. 3 shows a radio base station (eNB) that forms an unlicensed band cell, a user terminal (UE), and a downlink (DL) / uplink (UL) between them.
- eNB radio base station
- UE user terminal
- DL downlink
- UL uplink
- listening LBT
- FIG. 3A is an example in which an eNB performs LBT for both DL and UL.
- FIG. 3B is an example in which the transmission side performs LBT.
- LBT is performed by the eNB during DL transmission and by the UE during UL transmission.
- the LBT for UL implemented by the user terminal is also referred to as UL-LBT.
- a user terminal transmits an uplink scheduling request by transmitting a scheduling request (SR: Scheduling Request) or a random access preamble (RAP: Random Access Preamble) using PRACH in a UL subframe designated in advance.
- SR Scheduling Request
- RAP Random Access Preamble
- the radio base station that has received the request transmits a UL grant (UL grant) to the user terminal, and the user terminal transmits a PUSCH (Physical Uplink Shared Channel) using a resource based on the grant.
- PUSCH Physical Uplink Shared Channel
- the LBT result is LBT_idle
- the time that the channel can be occupied is limited. For example, in Europe, there is a rule that the maximum channel occupation time is 1 ms to 10 ms.
- the result of UL-LBT is LBT_idle
- time is available from the UL-LBT
- the UL resource cannot be sufficiently used due to the restriction of the channel occupation time related to the LBT. Therefore, it is required to perform data transmission as soon as possible after the UL-LBT is completed.
- the conventional transmission procedure is performed after it is determined that UL transmission is possible by UL-LBT, there is a problem that a large delay is required until actual UL transmission is performed. This delay may reduce the overall system throughput.
- the present inventors have conceived to reduce a delay until UL transmission when a user terminal performs LBT in a system that operates LTE / LTE-A in an unlicensed band. Specifically, it was conceived that the user terminal transmits predetermined information related to PUSCH transmission to the radio base station in the subframe in which UL-LBT is performed based on the result of UL-LBT.
- a user terminal can perform UL transmission promptly after UL-LBT, in the LTE system in the unlicensed band, an increase in delay until UL transmission is suppressed, and a decrease in throughput of the entire system is suppressed. It becomes possible to do.
- FIG. 4 is a diagram illustrating an example of a frame configuration for LBT in a system that operates LTE / LTE-A in an unlicensed band.
- One subframe (1 ms) is composed of two slots, and one slot corresponds to 0.5 ms.
- One slot is composed of 7 OFDM symbols (6 symbols when the extended cyclic prefix is used), and one OFDM symbol corresponds to 66.7 ⁇ s + T CP (T CP : cyclic prefix length).
- each subframe indicates the type of subframe.
- “D” is a downlink (DL) subframe
- “U” is an uplink (UL) subframe
- “S” is a special subframe.
- DL downlink
- U is an uplink
- S is a special subframe.
- DL downlink
- U is an uplink
- S is a special subframe.
- a subframe in which sensing by LBT is performed also referred to as a sensing subframe
- the subframe configuration (order of arrangement of D, U, and S) in FIG. 4 is an example, and is not limited thereto.
- the special subframe in the conventional (Rel. 11) TDD UL / DL configuration (TDD UL / DL configuration) is composed of DwPTS (Downlink Pilot TimeSlot), GP (Guard Period), and UpPTS (Uplink Pilot TimeSlot).
- the sensing subframe in the present invention is composed of an LBT (LBT period), a GP (Guard Period), and a Report (report period). That is, since the sensing subframe configuration in the present invention is similar to the conventional special subframe configuration, the mounting cost of the user terminal can be reduced.
- the LBT period is used for the user terminal to detect the channel state. Specifically, in the LBT period, the user terminal performs listening (LBT). Here, unlike the special subframe, the user terminal does not have to try to receive and demodulate / decode PDSCH (Physical Downlink Shared Channel) in the sensing subframe.
- LBT listening
- PDSCH Physical Downlink Shared Channel
- GP is used as a guard period for the user terminal to switch from listening to report transmission. Further, the cell coverage radius of the serving cell is determined according to the length of the GP. If it is desired to increase the cell radius, a relatively long GP is required. On the other hand, when the cell radius is small, a short GP is sufficient. That is, GP is a guard period for switching between transmission and reception.
- the report period is a period for transmitting feedback information for transmission in the UL subframe after the sensing subframe.
- the feedback information is used for the user terminal to transmit the PUSCH and for the radio base station to receive the PUSCH. That is, it is useful information regarding PUSCH transmission.
- the useful information candidates include a scheduling request (SR) / random access preamble (RAP). According to these, UL grant can be requested and data transmission can be performed after sensing.
- useful information candidates include parameters related to PUSCH demodulation, such as resource blocks (RB) and MCS (Modulation and Coding Scheme). By using these, it is possible to perform data transmission after sensing without using the UL grant.
- FIG. 5 is a flowchart showing an example of UL-LBT processing of the user terminal according to the present invention.
- the user terminal acquires a sensing pattern (step S1). As will be described later, the user terminal acquires the sensing pattern by implicit or explicit notification, or calculates and acquires it according to a predetermined rule.
- the sensing pattern is information relating to the configuration of sensing by LBT.
- the sensing pattern is information related to the timing at which the user terminal performs LBT.
- the sensing pattern is composed of, for example, a combination of a sensing subframe and a period for sensing (also referred to as a sensing subframe period or a sensing period).
- the sensing pattern may be expressed as (“subframe corresponding to sensing subframe”, “sensing cycle”).
- a sensing pattern when sensing is performed every 1 ms in an arbitrary subframe may be expressed as (arbitrary subframe, 1 ms).
- a sensing pattern is not restricted to the above-mentioned structure.
- the user terminal determines whether or not the current subframe is a sensing subframe based on the sensing pattern (step S2). If the current subframe is not a sensing subframe (step S2-NO), step S2 is performed again in the next subframe.
- step S3 If the current subframe is a sensing subframe (step S2-YES), UL-LBT is performed (step S3). Then, based on the UL-LBT result, it is determined whether or not the channel is free (step S4). If it is determined that the channel is not free (step S4-NO), step S2 is performed again in the next subframe.
- step S1 When the sensing pattern is calculated by the user terminal in step S1, when it is determined that the channel is not free, step S1 may be performed again (dotted line in FIG. 5).
- step S4-YES If it is determined that the channel is free (step S4-YES), UL transmission is performed in the subsequent UL subframe (step S5).
- the radio base station uses upper layer signaling (for example, RRC signaling) and broadcast information (for example, SIB1) to inform the user terminal about information regarding the configuration of sensing (for example, information on subframes corresponding to sensing subframes, sensing subframes). Frame period, etc.) and sensing subframe configuration information (for example, the length of each period (LBT, GP, Report) included in the sensing subframe) may be notified.
- RRC signaling for example, RRC signaling
- SIB1 broadcast information regarding the configuration of sensing
- frame period, etc. for example, the length of each period (LBT, GP, Report) included in the sensing subframe
- the configuration when the same configuration (for example, sensing configuration, sensing subframe configuration, etc.) is applied to user terminals in the cell, the configuration is cell-specific. Further, when a different configuration is applied to each user terminal, the configuration is said to be user-specific.
- the present invention mainly relates to step S5 in FIG.
- the user terminal performs data transmission based on the UL grant.
- the user terminal transmits information on the UL grant as the predetermined information on PUSCH transmission in the same subframe as the subframe on which UL-LBT is implemented.
- Embodiment 1.1 when the user terminal determines that the channel is free by listening in the LBT period, the user terminal transmits an SR / RAP to request a UL grant in the same sensing subframe report period.
- the radio resource for mapping SR / RAP is selected at random in order to reduce the possibility of collision between user terminals. For example, radio resources may be selected randomly in the time or frequency direction within the report period, or code resources applied to the radio resources may be selected randomly.
- the radio base station schedules UL grant for one or more user terminals that have transmitted SR / RAP.
- FIG. 6 is a diagram illustrating an example in which the lengths of the LBT, GP, and Report in the first embodiment are cell-specific.
- a certain radio frame and symbols included in the sensing subframes of two user terminals (UEs 1 and 2) in the frame are shown.
- UE 1 and 2 determine that the channel is free in the LBT period, and determine transmission timing randomly within the report period.
- UE 1 transmits SR / RAP to the radio base station (eNB) using the first OFDM symbol in the report period and UE 2 uses the third OFDM symbol in the report period.
- the eNB transmits UL grants to the UEs 1 and 2 after a predetermined time (for example, after 4 ms) from the sensing subframe.
- the UL grant includes, for example, a resource block (RB) to which a PUSCH is allocated, an MCS, a PHICH (Physical Hybrid-ARQ Indicator Channel) resource indication (PHICH resource indication), and the like.
- the UEs 1 and 2 that have received the UL grant transmit PUSCH based on the UL grant, and perform retransmission control when the eNB receives a PUSCH reception failure after a predetermined subframe.
- Embodiment 1.2 when the user terminal determines that the channel is free by listening in the LBT period, the user terminal transmits the SR / RAP using the first OFDM symbol in the report period of the same sensing subframe to transmit UL. Request a grant.
- the symbol for transmitting SR / RAP is not limited to the first OFDM symbol in the report period, and may be a symbol overlapping with the LBT period of another user terminal.
- FIG. 7 is a diagram illustrating an example in which the lengths of the LBT, GP, and Report in the first embodiment are specific to the user terminal.
- a certain radio frame and symbols included in the sensing subframes of two user terminals (UEs 1 and 2) in the frame are shown.
- the UE 1 LBT period is set shorter than the UE 2 LBT period.
- the sum of the UE 1 LBT period and the guard period is shorter than the sum of the UE 2 LBT period and the guard period.
- the eNB transmits a UL grant to the UE 1 after a predetermined time (for example, after 4 ms) from the sensing subframe.
- the UE 1 that has received the UL grant transmits a PUSCH based on the UL grant, and performs retransmission control when the eNB receives a PUSCH reception failure after a predetermined subframe.
- the user terminal with the shortest LBT period basically transmits the SR / RAP and obtains the right to transmit the PUSCH. For this reason, in order to ensure fairness of transmission opportunities at a plurality of user terminals, it is preferable that the LBT period is changed semi-statically.
- FIG. 8 is a diagram illustrating an example of changing the length of the LBT period semi-statically.
- UE 1 has a shorter LBT period than UE 2 in a certain sensing subframe, but UE 1 has a longer LBT period than UE 2 in another sensing subframe. The fairness of transmission opportunities is maintained between them.
- requires a specific UL grant was shown.
- the second embodiment described below is the same as the first embodiment in that data transmission is performed based on the UL grant.
- a radio base station notifies a user terminal group of a plurality of UL grants in advance and each user terminal selects a UL grant that the user terminal desires to use is shown.
- the user terminal group refers to one or more user terminals presented with a plurality of common UL grants.
- the second embodiment is called collision-type PUSCH transmission (contention-based PUSCH transmission) because the same UL grant may be used between user terminals, which may cause contention. Also good.
- the UL grant that is commonly notified to the user terminal group is also referred to as a collision-type grant (CB grant), a common UL grant, or the like. Since the CB grant can be configured to indicate different frequency resources at the same time, according to the second embodiment, it is possible to further improve the utilization efficiency of radio resources.
- CB grant detection is performed based on a predetermined identifier corresponding to each CB grant.
- the predetermined identifier may be called, for example, CB-RNTI (Contention-Based Radio Network Temporary Identifier). Since normal PDCCH (Physical Downlink Control Channel) is transmitted using C-RNTI (Cell RNTI) set for each user terminal, CB-RNTI is different from C-RNTI of each user terminal. It is preferably set.
- FIG. 9 is a sequence diagram illustrating an example of a data transmission process of the user terminal according to the second embodiment.
- the radio base station notifies an available CB-RNTI to the user terminal group (step S11).
- the CB-RNTI may be notified by higher layer signaling (for example, RRC signaling), broadcast information (for example, SIB1), or the like.
- RRC signaling for example, RRC signaling
- SIB1 broadcast information
- a plurality of CB-RNTIs may be notified as available CB-RNTIs.
- the user terminal that has received the CB-RNTI starts monitoring the PDCCH for CB grant based on the CB-RNTI (step S12).
- a user terminal that is notified that a plurality of CB-RNTIs can be used may monitor all the PDCCHs indicated by the plurality of CB-RNTIs, or may monitor a part of the PDCCHs.
- the PDCCH may include an EPDCCH (Enhanced Physical Downlink Control Channel).
- the radio base station transmits a CB grant to the user terminal group at a predetermined timing (step S13).
- the user terminal that detects (receives) the CB grant corresponding to the notified available CB-RNTI starts channel sensing (step S14). Specifically, sensing is performed in the LBT period in the sensing subframe after detecting the CB grant.
- one of the CB grants is selected, and information indicating the selected CB grant is notified during the report period. Then, based on the selected CB grant, PUSCH transmission is performed using a predetermined radio resource (step S15).
- steps S14 to S15 in FIG. 9 correspond to steps S2 to S5 in FIG. Also, steps S11 to S13 in FIG. 9 are preferably performed before step S2 in FIG.
- a predetermined user terminal group receives a plurality of common UL grants (CB grants) in advance.
- CB grants common UL grants
- the user terminal determines that the channel is free by listening in the LBT period
- the user terminal transmits information indicating the selected CB grant in the reporting period of the same sensing subframe.
- the radio resource that maps the information indicating the selected CB grant is randomly selected in order to reduce the possibility of collision between user terminals.
- radio resources may be selected randomly in the time or frequency direction within the report period, or code resources applied to the radio resources may be selected randomly.
- FIG. 10 is a diagram illustrating an example in which the lengths of LBT, GP, and Report in the second embodiment are cell-specific.
- the UEs 1 and 2 determine that the channel is free in the LBT period, and randomly determine the transmission timing within the report period.
- UE 1 is the first OFDM symbol in the report period
- UE 2 is information indicating the CB grant selected using the third OFDM symbol in the report period (UL grant 1 and UL grant 2 respectively). Send information).
- the UEs 1 and 2 transmit PUSCH based on the selected CB grant, and perform retransmission control when the eNB receives a PUSCH reception failure after a predetermined subframe.
- the information indicating the CB grant is information that allows the radio base station to know which CB grant the user terminal has selected. For example, it may be an index individually assigned to a plurality of CB grants, or information on RBs of radio resources indicated by each CB grant (for example, RB start position, number of RBs, RB bandwidth). May be.
- other useful information such as NAV (Network Allocation Vector) and BSR (Buffer Status Report) may be notified together with the information indicating the CB grant.
- a predetermined user terminal group receives a plurality of common UL grants (CB grants) in advance.
- CB grants common UL grants
- the user terminal determines that the channel is free by listening in the LBT period
- the user terminal transmits information indicating the selected CB grant using the first OFDM symbol in the report period of the same sensing subframe.
- the symbol which transmits the information which shows CB grant is not restricted to the 1st OFDM symbol in a report period, The symbol which overlaps with the LBT period of another user terminal may be sufficient.
- FIG. 11 is a diagram illustrating an example in which the lengths of LBT, GP, and Report in the second embodiment are specific to the user terminal.
- the UE 1 LBT period is set shorter than the UE 2 LBT period.
- UE 1 determines that the channel is free in the LBT period, and transmits information indicating the CB grant (UL grant 1) selected using the first OFDM symbol in the report period.
- UE 2 determines that the channel is busy in the LBT period due to the influence of interference of the signal transmitted by UE 1.
- UE 1 transmits PUSCH based on the CB grant, and performs retransmission control when notified of PUSCH reception failure from the eNB after a predetermined subframe.
- the user terminal with the shortest LBT period basically obtains the right to transmit PUSCH.
- the LBT period is changed semi-statically as shown in FIG.
- the time from the transmission of the SR / RAP to the reception of the UL grant can be omitted.
- the user terminal can transmit the PUSCH with low delay, and it is possible to suppress a decrease in throughput of the entire system.
- each user terminal may select and use a plurality of CB grants.
- CB grants may be transmitted in a short time by using a plurality of UL grants.
- Embodiment 2.2 since a specific user terminal that has determined that the channel is free by LBT can transmit large data in a short time using all of the plurality of assigned UL grants, Throughput and utilization efficiency of radio resources can be improved.
- the user terminal performs data transmission without using the UL grant.
- the user terminal determines information necessary for PUSCH demodulation (for example, resource block (RB) to which PUSCH is allocated, MCS, PHICH resource instruction, etc.) as predetermined information related to PUSCH transmission, and UL-LBT is determined.
- the information is transmitted to the radio base station in the same subframe as the performed subframe.
- the information necessary for PUSCH demodulation is information necessary for PUSCH transmission.
- FIG. 12 is a diagram illustrating an example of the third embodiment.
- the UE determines that the channel is free in the LBT period, transmits information necessary for demodulation of PUSCH within the report period, and transmits PUSCH based on these information in the subsequent UL subframe.
- the RB can be determined based on the uplink bandwidth sensed by the user terminal with LBT. Therefore, the RB may use the entire bandwidth of the unlicensed band or the bandwidth of a predetermined subband.
- FIG. 13 is a diagram showing an example of UL signal allocation in the unlicensed band.
- UE 1 transmits using RB of subband 1 and UE 2 uses RB of subband 2 in a certain subframe. Further, in different subframes, UE 3 transmits using the RB of the entire bandwidth.
- the UL signal allocation is not limited to the example in FIG. 13, and the number of user terminals, the bandwidth, and the like may be different, and the allocation of each RB may be different.
- BLER indicates a block error rate, and can be obtained from, for example, the total number of received blocks and the number of blocks including errors.
- SINR P T / P I , P T is the transmission power of the user terminal, and P I is the interference power estimated by the user terminal.
- the interference power can be estimated from the measurement result of the unlicensed band in a predetermined period, for example.
- the user terminal calculates these values and feeds back a specific MCS to the radio base station.
- the MCS is, for example, an MCS index (MCS index) that represents a combination of a predetermined modulation scheme and coding rate.
- MCS may be obtained by the following equation 2.
- MCS latest DCI MCS -Delta offset
- the latest DCI MCS is an MCS included in the latest DCI received using the PDCCH.
- Delta offset is a value indicating a difference between the latest DCI MCS and the MCS applied to the PUSCH transmitted by the user terminal.
- FIG. 14 is a diagram illustrating an example of notification of MCS in the third embodiment.
- the user terminal calculates the delta offset using the latest DCI MCS included in the PDCCH one subframe before, for example, based on Equation 2, and transmits the delta offset during the report period. .
- FIG. 15 is a diagram illustrating an example of a conventional instruction for PHICH resources.
- the radio base station transmits a UL grant (for example, DCI 0/4) to the user terminal.
- the UL grant includes n DMRS which is a value related to a cyclic shift of a DM-RS (Demodulation Reference Signal) used for UL transmission.
- DM-RS Demodulation Reference Signal
- a user terminal transmits UL data by PUSCH based on UL grant.
- the radio base station transmits a HARQ delivery confirmation signal (ACK / NACK) by PHICH based on whether or not the UL data has been correctly received.
- ACK / NACK HARQ delivery confirmation signal
- the user terminal can monitor appropriate PHICH based on n DMRS .
- n DMRS is determined as follows.
- n DMRS may be associated with a predetermined parameter.
- n DMRS may be mapped to C-RNTI (Cell RNTI) set for each user terminal, or may be mapped to a subband index indicating a subband.
- C-RNTI Cell RNTI
- the amount of signaling related to n DMRS can be reduced. This configuration is suitable when a plurality of user terminals perform PUSCH transmission.
- n DMRS may be selected by a user terminal. The selection may be performed randomly or based on a predetermined parameter (for example, C-RNTI).
- FIG. 16 is a diagram illustrating an example of n DMRS notification in the third embodiment. As illustrated in FIG. 16, the user terminal feeds back the selected n DMRS to the radio base station.
- Embodiment 3.1 when the user terminal determines that the channel is free by listening in the LBT period, information used for PUSCH demodulation (for example, RB, MCS, PHICH in the reporting period of the same sensing subframe) Resource resources, C-RNTI, etc.). Note that other useful information may be transmitted together with information used for PUSCH demodulation.
- radio resources for mapping various types of information in the report period are randomly selected in order to reduce the possibility of collision between user terminals. For example, radio resources may be selected randomly in the time or frequency direction within the report period, or code resources applied to the radio resources may be selected randomly.
- FIG. 17 is a diagram illustrating an example in which the lengths of LBT, GP, and Report are cell-specific in the third embodiment.
- the UEs 1 and 2 determine that the channel is free in the LBT period, and randomly determine the transmission timing within the report period.
- UE 1 uses the first OFDM symbol in the report period
- UE 2 uses the third OFDM symbol in the report period to indicate information necessary for PUSCH demodulation (RB, MCS, PHICH resource indication, C-RNTI).
- UE1 and 2 transmit PUSCH based on the said information, and perform retransmission control, when notification of PUSCH reception failure is notified from eNB after a predetermined subframe.
- Embodiment 3.2 when the user terminal determines that the channel is free by listening in the LBT period, information used for demodulation of PUSCH using the first OFDM symbol in the report period of the same sensing subframe Send.
- the symbol which transmits the information utilized for the demodulation of PUSCH is not restricted to the 1st OFDM symbol in a report period, The symbol which overlaps with the LBT period of another user terminal may be sufficient.
- FIG. 18 is a diagram illustrating an example when the lengths of the LBT, GP, and Report in the third embodiment are specific to the user terminal.
- the UE 1 LBT period is set shorter than the UE 2 LBT period.
- UE 1 determines that the channel is free during the LBT period, and uses the first OFDM symbol within the report period to provide information necessary for demodulation of PUSCH (RB, MCS, PHICH resource indication, C-RNTI, etc.) Send.
- UE 2 determines that the channel is busy in the LBT period due to the influence of interference of the signal transmitted by UE 1.
- UE 1 transmits PUSCH based on the above information, and performs retransmission control when it is notified of PUSCH reception failure from the eNB after a predetermined subframe.
- the user terminal with the shortest LBT period basically obtains the right to transmit the PUSCH.
- the LBT period is changed semi-statically as shown in FIG.
- FIG. 19 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention.
- the radio communication system shown in FIG. 19 is a system including, for example, an LTE system, SUPER 3G, LTE-A system, and the like.
- carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) having the system bandwidth of the LTE system as one unit can be applied.
- the radio communication system shown in FIG. 19 has a radio base station (for example, an LTE-U base station) that can use an unlicensed band.
- This wireless communication system may be called IMT-Advanced, or may be called 4G, FRA (Future Radio Access), or the like.
- the radio communication system 1 shown in FIG. 19 includes a radio base station 11 that forms a macro cell C1, and radio base stations 12a-12c that are arranged in the macro cell C1 and form a small cell C2 that is narrower than the macro cell C1. .
- the user terminal 20 is arrange
- the user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 that use different frequencies simultaneously by CA or DC. For example, assist information (for example, DL signal configuration) regarding the radio base station 12 (for example, LTE-U base station) that uses the unlicensed band is transmitted from the radio base station 11 that uses the license band to the user terminal 20. can do. Further, when CA is performed in the license band and the unlicensed band, it is possible to adopt a configuration in which one radio base station (for example, the radio base station 11) controls the schedules of the license band cell and the unlicensed band cell.
- assist information for example, DL signal configuration
- LTE-U base station LTE-U base station
- the user terminal 20 may be connected to the radio base station 12 without being connected to the radio base station 11.
- the wireless base station 12 using the unlicensed band may be connected to the user terminal 20 in a stand-alone manner.
- the radio base station 12 controls the schedule of the unlicensed band cell.
- Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth (referred to as an existing carrier or a legacy carrier).
- a carrier having a relatively high frequency band for example, 3.5 GHz, 5 GHz, etc.
- a wide bandwidth may be used between the user terminal 20 and the radio base station 12, or The same carrier may be used.
- a wired connection optical fiber, X2 interface, etc.
- a wireless connection may be employed between the wireless base station 11 and the wireless base station 12 (or between the two wireless base stations 12).
- the radio base station 11 and each radio base station 12 are connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30.
- the upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- RNC radio network controller
- MME mobility management entity
- Each radio base station 12 may be connected to the higher station apparatus 30 via the radio base station 11.
- the radio base station 11 is a radio base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like.
- the radio base station 12 is a radio base station having local coverage, and includes a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), and transmission / reception. It may be called a point.
- the radio base stations 11 and 12 are not distinguished, they are collectively referred to as a radio base station 10.
- Each user terminal 20 is a terminal that supports various communication schemes such as LTE and LTE-A, and may include not only a mobile communication terminal but also a fixed communication terminal.
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier.
- SC-FDMA is a single-carrier transmission scheme that reduces interference between terminals by dividing the system bandwidth into bands consisting of one or continuous resource blocks for each terminal and using a plurality of terminals with mutually different bands. is there.
- the uplink and downlink radio access methods are not limited to these combinations.
- downlink channels include a downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, and the like. Used. User data, higher layer control information, and predetermined SIB (System Information Block) are transmitted by PDSCH. Also, a synchronization signal, MIB (Master Information Block), etc. are transmitted by PBCH.
- PDSCH downlink shared channel
- PBCH Physical Broadcast Channel
- SIB System Information Block
- Downlink L1 / L2 control channels include PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), and the like.
- Downlink control information (DCI: Downlink Control Information) including scheduling information of PDSCH and PUSCH is transmitted by PDCCH.
- the number of OFDM symbols used for PDCCH is transmitted by PCFICH.
- the HAICH transmission confirmation signal (ACK / NACK) for PUSCH is transmitted by PHICH.
- the EPDCCH is frequency division multiplexed with a PDSCH (downlink shared data channel) and may be used to transmit DCI or the like in the same manner as the PDCCH.
- an uplink shared channel (PUSCH: Physical Uplink Shared Channel), an uplink control channel (PUCCH: Physical Uplink Control Channel), and a random access channel (PRACH) shared by each user terminal 20 are used. Physical Random Access Channel) is used. User data and higher layer control information are transmitted by PUSCH. Also, downlink radio quality information (CQI: Channel Quality Indicator), a delivery confirmation signal, and the like are transmitted by PUCCH.
- CQI Channel Quality Indicator
- a delivery confirmation signal and the like are transmitted by PUCCH.
- a random access preamble (RA preamble) for establishing a connection with the cell is transmitted by the PRACH.
- FIG. 20 is a diagram illustrating an example of the overall configuration of the radio base station 10 (including the radio base stations 11 and 12) according to the present embodiment.
- the radio base station 10 includes a plurality of transmission / reception antennas 101 for MIMO transmission, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106.
- the transmission / reception unit 103 may include a transmission unit and a reception unit.
- User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access
- Retransmission control for example, HARQ (Hybrid Automatic Repeat reQuest) transmission processing
- HARQ Hybrid Automatic Repeat reQuest
- the downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and transferred to each transmitting / receiving unit 103.
- the baseband signal processing unit 104 notifies the user terminal 20 of control information (system information) for communication in the cell by higher layer signaling (for example, RRC signaling, broadcast information, etc.).
- the information for communication in the cell includes, for example, the system bandwidth in the uplink and the system bandwidth in the downlink.
- assist information regarding unlicensed band communication may be transmitted from the radio base station (for example, the radio base station 11) to the user terminal 20 in the license band.
- Each transmission / reception unit 103 converts the baseband signal output by precoding from the baseband signal processing unit 104 for each antenna to a radio frequency band and transmits the converted signal.
- the radio frequency signal frequency-converted by the transmission / reception unit 103 is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101.
- the transmission / reception unit 103 can be a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present invention.
- the radio frequency signal received by each transmitting / receiving antenna 101 is amplified by the amplifier unit 102.
- Each transmitting / receiving unit 103 receives the upstream signal amplified by the amplifier unit 102.
- the transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.
- the transmission / reception unit 103 receives a signal including predetermined information regarding PUSCH transmission from the user terminal 20 and outputs the signal to the baseband signal processing unit 104.
- the baseband signal processing unit 104 performs fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT: Inverse Discrete Fourier Transform) processing, and error correction on user data included in the input upstream signal.
- FFT fast Fourier transform
- IDFT inverse discrete Fourier transform
- Decoding, MAC retransmission control reception processing, RLC layer, and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106.
- the call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.
- the transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
- the transmission path interface 106 may transmit and receive signals (backhaul signaling) to and from the adjacent radio base station 10 via an inter-base station interface (for example, an optical fiber or an X2 interface).
- an inter-base station interface for example, an optical fiber or an X2 interface.
- the transmission path interface 106 may transmit and receive a TDD UL / DL configuration, a special subframe configuration, a sensing subframe configuration, a sensing pattern, and the like with the adjacent radio base station 10.
- FIG. 21 is a diagram illustrating an example of a functional configuration of the radio base station according to the present embodiment. Note that FIG. 21 mainly shows functional blocks of characteristic portions in the present embodiment, and the wireless base station 10 also has other functional blocks necessary for wireless communication.
- the baseband signal processing unit 104 included in the radio base station 10 includes a control unit (scheduler) 301, a transmission signal generation unit 302, a mapping unit 303, and a reception processing unit 304. ing.
- the control unit (scheduler) 301 controls scheduling (for example, resource allocation) of downlink data signals transmitted on PDSCH, downlink control signals transmitted on PDCCH and / or enhanced PDCCH (EPDCCH). It also controls scheduling of system information, synchronization signals, downlink reference signals such as CRS (Cell-specific Reference Signal) and CSI-RS (Channel State Information Reference Signal). It also controls scheduling such as uplink reference signals, uplink data signals transmitted on PUSCH, uplink control signals transmitted on PUCCH and / or PUSCH, and RA preambles transmitted on PRACH.
- scheduling for example, resource allocation of downlink data signals transmitted on PDSCH, downlink control signals transmitted on PDCCH and / or enhanced PDCCH (EPDCCH). It also controls scheduling of system information, synchronization signals, downlink reference signals such as CRS (Cell-specific Reference Signal) and CSI-RS (Channel State Information Reference Signal). It also controls scheduling such as uplink reference signals, uplink data signals transmitted on PUSCH, uplink control
- control unit 301 When scheduling is performed by one control unit (scheduler) 301 for the license band and the unlicensed band, the control unit 301 controls communication between the license band cell and the unlicensed band cell.
- the control unit 301 may be a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
- control unit 301 determines a sensing pattern and / or sensing subframe configuration used by the user terminal 20, outputs the determined sensing pattern and / or sensing subframe configuration to the transmission signal generation unit 302, and outputs to the mapping unit 303. Control may be performed so as to map a signal including such information.
- the control unit 301 controls the transmission signal generation unit 302, the mapping unit 303, and the reception processing unit 304 so as to demodulate the PUSCH of the user terminal 20 based on predetermined information regarding PUSCH transmission input from the reception processing unit 304. To do. Specifically, when the predetermined information is a scheduling request (SR) / random access preamble (RAP), the control unit 301 transmits an UL grant indicating an appropriate radio resource to the user terminal. The transmission signal generation unit 302 and the mapping unit 303 are controlled so as to transmit to 20, and the reception processing unit 304 is controlled to demodulate the PUSCH using the radio resource (first embodiment).
- SR scheduling request
- RAP random access preamble
- control unit 301 selects an appropriate user terminal group and performs control so as to notify a plurality of UL grants (CB grants) in common (second embodiment).
- the predetermined information is information indicating the CB grant
- the reception processing unit 304 is controlled to demodulate the PUSCH with the radio resource indicated by the CB grant.
- the control unit 301 performs control so that a predetermined identifier (for example, CB-RNTI) corresponding to the CB grant is notified to the user terminal group in advance.
- a predetermined identifier for example, CB-RNTI
- the control unit 301 indicates the radio indicated by the information.
- the reception processing unit 304 is controlled so as to demodulate the PUSCH with resources (third embodiment).
- the transmission signal generation unit 302 generates a DL signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on an instruction from the control unit 301 and outputs the DL signal to the mapping unit 303. For example, based on an instruction from the control unit 301, the transmission signal generation unit 302 generates a DL assignment that notifies downlink signal allocation information and a UL grant that notifies uplink signal allocation information. Further, the downlink data signal is subjected to coding processing and modulation processing according to a coding rate, a modulation scheme, and the like determined based on channel state information (CSI) from each user terminal 20.
- the transmission signal generation unit 302 may be a signal generator or a signal generation circuit described based on common recognition in the technical field according to the present invention.
- the mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a radio resource based on an instruction from the control unit 301, and outputs the radio signal to the transmission / reception unit 103.
- the mapping unit 303 can be a mapping circuit or a mapper described based on common recognition in the technical field according to the present invention.
- the reception processing unit 304 performs reception processing (for example, demapping, demodulation, decoding) on UL signals (for example, a delivery confirmation signal (HARQ-ACK), a data signal transmitted by PUSCH, etc.) transmitted from the user terminal. Etc.).
- the reception processing unit 304 may measure the received power (RSRP) and the channel state using the received signal.
- the processing result and the measurement result may be output to the control unit 301.
- the reception processing unit 304 can be a signal processing / measurement device or a signal processing / measurement circuit described based on common recognition in the technical field according to the present invention.
- the reception processing unit 304 acquires predetermined information related to PUSCH transmission and outputs it to the control unit 301. Further, the reception processing unit 304 receives and demodulates the PUSCH using radio resources indicated by predetermined information based on an instruction from the control unit 301.
- FIG. 22 is a diagram illustrating an example of the overall configuration of the user terminal according to the present embodiment.
- the user terminal 20 includes a plurality of transmission / reception antennas 201 for MIMO transmission, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205.
- the transmission / reception unit 203 may include a transmission unit and a reception unit.
- the radio frequency signals received by the plurality of transmission / reception antennas 201 are each amplified by the amplifier unit 202.
- Each transmitting / receiving unit 203 receives the downlink signal amplified by the amplifier unit 202.
- the transmission / reception unit 203 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204.
- the transmission / reception unit 203 can be a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present invention.
- the transmission / reception unit 203 can transmit / receive UL / DL signals in an unlicensed band.
- the transmission / reception unit 203 may be capable of transmitting / receiving UL / DL signals in a license band.
- the baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, and the like on the input baseband signal.
- the downlink user data is transferred to the application unit 205.
- the application unit 205 performs processing related to layers higher than the physical layer and the MAC layer.
- broadcast information in the downlink data is also transferred to the application unit 205.
- uplink user data is input from the application unit 205 to the baseband signal processing unit 204.
- the baseband signal processing unit 204 performs retransmission control transmission processing (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like.
- the data is transferred to the transmission / reception unit 203.
- the transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits it.
- the radio frequency signal frequency-converted by the transmission / reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.
- FIG. 23 is a diagram illustrating an example of a functional configuration of the user terminal according to the present embodiment.
- FIG. 23 mainly shows functional blocks of characteristic portions in the present embodiment, and the user terminal 20 also has other functional blocks necessary for wireless communication.
- the baseband signal processing unit 204 included in the user terminal 20 includes a control unit 401, a transmission signal generation unit 402, a mapping unit 403, and a reception processing unit 404.
- the control unit 401 obtains, from the received signal processing unit 404, a downlink control signal (a signal transmitted by PDCCH / EPDCCH) and a downlink data signal (a signal transmitted by PDSCH) transmitted from the radio base station 10.
- the control unit 401 generates an uplink control signal (for example, an acknowledgment signal (HARQ-ACK)) or an uplink data signal based on a downlink control signal, a result of determining whether retransmission control is necessary for the downlink data signal, or the like.
- HARQ-ACK acknowledgment signal
- the control unit 401 controls the transmission signal generation unit 402 and the mapping unit 403.
- the control unit 401 may be a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
- control unit 401 has a function of grasping the buffer amount of the UL data input from the application unit 205.
- the control unit 401 causes the reception processing unit 404 to perform UL-LBT in the sensing subframe. To control. Even when there is no UL data, the reception processing unit 404 may perform UL-LBT.
- control unit 401 controls a predetermined subframe as a sensing subframe.
- control unit 401 may grasp the sensing pattern based on the notification from the radio base station 10 and control the sensing subframe based on the sensing pattern.
- the control unit 401 When the control unit 401 determines that the channel is free as a result of performing the UL-LBT in the reception processing unit 404, the control unit 401 transmits predetermined information on PUSCH transmission in the same subframe as the subframe in which UL-LBT is performed.
- the transmission signal generation unit 402 and the mapping unit 403 are controlled so as to transmit.
- the control unit 401 includes a transmission signal generation unit 402 and a mapping unit so as to transmit a scheduling request (SR) / random access preamble (RAP) in a sensing subframe report period. 403 is controlled (first embodiment).
- control unit 401 displays information indicating at least one CB grant among a plurality of UL grants (CB grants) previously notified from the radio base station 10 to a predetermined user terminal group in the sensing subframe.
- the transmission signal generator 402 and the mapping unit 403 are controlled so as to transmit in the report period (second embodiment).
- the control unit 401 may be configured to cause the reception processing unit 404 to perform UL-LBT when notified from the reception processing unit 404 that a CB grant has been detected.
- the control unit 401 may control the reception processing unit 404 to perform LBT in a sensing subframe after CB grant detection.
- control unit 401 transmits a transmission signal so as to transmit information necessary for demodulating the PUSCH (for example, an instruction of a resource block (RB) to which the PUSCH is allocated, MCS, PHICH resource, etc.) in the reporting period of the sensing subframe.
- the generation unit 402 and the mapping unit 403 are controlled (third embodiment).
- control unit 401 controls the transmission signal generation unit 402 and the mapping unit 403 so as to transmit the PUSCH with the radio resource indicated by the information regarding the PUSCH transmission transmitted to the radio base station 10.
- the control unit 401 transmits predetermined information using random radio resources (for example, randomly determined OFDM symbols) within the report period. It is preferable to control.
- the control unit 401 performs control so that predetermined information is transmitted at an early timing (for example, the first OFDM symbol) within the report period. It is preferable.
- the transmission signal generation unit 402 generates a UL signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on an instruction from the control unit 401, and outputs the UL signal to the mapping unit 403.
- the transmission signal generation unit 402 generates uplink control signals such as a delivery confirmation signal (HARQ-ACK) and channel state information (CSI) based on an instruction from the control unit 401.
- the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401.
- the control unit 401 instructs the transmission signal generation unit 402 to generate an uplink data signal.
- the transmission signal generation unit 402 can be a signal generator or a signal generation circuit described based on common recognition in the technical field according to the present invention.
- the mapping unit 403 maps the uplink signal generated by the transmission signal generation unit 402 to a radio resource based on an instruction from the control unit 401, and outputs the radio signal to the transmission / reception unit 203.
- the mapping unit 403 can be a mapping circuit or a mapper described based on common recognition in the technical field according to the present invention.
- the reception processing unit 404 performs a reception process (for example, a downlink control signal transmitted from the radio base station, a downlink data signal transmitted by the PDSCH, etc.) transmitted in the license band and the unlicensed band. Demapping, demodulation, decoding, etc.).
- the reception processing unit 404 outputs the TDD UL / DL configuration, special subframe configuration, sensing subframe configuration, sensing pattern, and the like from the radio base station 10 to the control unit 401. Further, the reception processing unit 404 may measure the received power (RSRP) and the channel state using the received signal. The processing result and the measurement result may be output to the control unit 401.
- the reception processing unit 404 may be a signal processing / measurement device or a signal processing / measurement circuit described based on common recognition in the technical field according to the present invention.
- the reception processing unit 404 Based on an instruction from the control unit 401, the reception processing unit 404 performs LBT in an unlicensed band using a predetermined subframe (for example, a special subframe) as a sensing subframe, and performs an LBT result (for example, a channel state). Is a clear result or a busy determination result) is output to the control unit 401.
- a predetermined subframe for example, a special subframe
- an LBT result for example, a channel state
- the reception processing unit 404 detects the CB grant based on a predetermined identifier (for example, CB-RNTI) corresponding to each CB grant.
- the control unit 401 may be notified that the CB grant has been detected.
- each functional block is realized by one physically coupled device, or may be realized by two or more physically separated devices connected by wire or wirelessly and by a plurality of these devices. Good.
- radio base station 10 and the user terminal 20 are realized using hardware such as ASIC (Application Specific Integrated Circuit), PLD (Programmable Logic Device), and FPGA (Field Programmable Gate Array). May be.
- the radio base station 10 and the user terminal 20 may be realized by a computer apparatus including a processor (CPU), a communication interface for network connection, a memory, and a computer-readable storage medium holding a program. Good.
- the processor and memory are connected by a bus for communicating information.
- the computer-readable recording medium is a storage medium such as a flexible disk, a magneto-optical disk, a ROM, an EPROM, a CD-ROM, a RAM, and a hard disk.
- the program may be transmitted from a network via a telecommunication line.
- the radio base station 10 and the user terminal 20 may include an input device such as an input key and an output device such as a display.
- the functional configurations of the radio base station 10 and the user terminal 20 may be realized by the hardware described above, may be realized by a software module executed by a processor, or may be realized by a combination of both.
- the processor controls the entire user terminal by operating an operating system. Further, the processor reads programs, software modules and data from the storage medium into the memory, and executes various processes according to these.
- the program may be a program that causes a computer to execute the operations described in the above embodiments.
- the control unit 401 of the user terminal 20 may be realized by a control program stored in a memory and operated by a processor, and may be realized similarly for other functional blocks.
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Abstract
Description
第1の実施形態では、ユーザ端末は、ULグラントに基づいてデータ送信を実施する。この場合、ユーザ端末は、UL-LBTを実施したサブフレームと同じサブフレームで、PUSCH送信に関する所定の情報として、ULグラントに関する情報を送信する。
上記第1の実施形態では、ユーザ端末が固有のULグラントを要求する場合を示した。以下で説明する第2の実施形態では、ULグラントに基づいてデータ送信を実施する点は第1の実施形態と同じである。第2の実施形態では、無線基地局がユーザ端末群に対して複数のULグラントを事前に通知し、各ユーザ端末が利用を希望するULグラントを選択する場合を示す。ここで、ユーザ端末群は、共通する複数のULグラントを提示された1つ以上のユーザ端末のことをいう。
上記第1及び第2の実施形態では、ユーザ端末が固有又は共有のULグラントを要求する場合を示した。以下で説明する第3の実施形態では、第1及び第2の実施形態と異なり、ユーザ端末は、ULグラントを用いずにデータ送信を実施する。この場合、ユーザ端末はPUSCH送信に関する所定の情報として、PUSCHの復調に必要な情報(例えば、PUSCHを割り当てるリソースブロック(RB)、MCS、PHICH用リソースの指示など)を決定し、UL-LBTを実施したサブフレームと同じサブフレームで、当該情報を無線基地局に送信する。PUSCHの復調に必要な情報は、言い換えると、PUSCHの送信に必要な情報である。
(式1)
MCS=f(所望のBLER、 SINR)
MCS=最新のDCIMCS - Deltaoffset
ここで、最新のDCIMCSは、PDCCHを用いて受信した最新のDCIに含まれるMCSのことである。また、Deltaoffsetは、最新のDCIMCSと、ユーザ端末が送信するPUSCHに適用するMCSと、の差分を示す値である。
以下、本発明の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、上記第1-第3の実施形態に係る無線通信方法が適用される。なお、上記の各実施形態に係る無線通信方法は、それぞれ単独で適用してもよいし、組み合わせて適用してもよい。
Claims (10)
- アンライセンスバンドを用いて無線基地局と通信可能なユーザ端末であって、
アンライセンスバンドのチャネル状態を、センシングサブフレームでLBT(Listen Before Talk)を行って検出する受信処理部と、
所定のサブフレームを前記センシングサブフレームとして制御する制御部と、
前記LBTの結果に基づいて、PUSCH送信に関する所定の情報を、前記センシングサブフレームで送信する送信部と、を有することを特徴とするユーザ端末。 - 前記所定の情報は、ULグラントを要求するためのスケジューリング要求又はランダムアクセスプリアンブルであることを特徴とする請求項1に記載のユーザ端末。
- 前記所定の情報は、複数のユーザ端末に共通して通知される複数のULグラントのうち少なくとも1つを示す情報であることを特徴とする請求項1に記載のユーザ端末。
- 前記受信処理部は、前記複数のULグラントを、各ULグラントに対応する所定の識別子に基づいて検出することを特徴とする請求項3に記載のユーザ端末。
- 前記所定の情報は、前記PUSCHの復調に必要な情報を含むことを特徴とする請求項1に記載のユーザ端末。
- 前記センシングサブフレームは、LBTを実施するLBT期間と、送受信の切り替え用ガード期間と、前記所定の情報を送信するレポート期間と、から構成されることを特徴とする請求項1から請求項5のいずれかに記載のユーザ端末。
- 前記送信部は、前記所定の情報を、前記レポート期間内でランダムに決定したOFDMシンボルで送信することを特徴とする請求項6に記載のユーザ端末。
- 前記送信部は、前記所定の情報を、前記レポート期間内の最初のOFDMシンボルで送信することを特徴とする請求項6に記載のユーザ端末。
- アンライセンスバンドを利用可能なユーザ端末と通信を行う無線基地局であって、
前記ユーザ端末のPUSCH送信に関する所定の情報を取得する受信処理部と、
前記所定の情報に基づいて、前記PUSCHを復調するように制御する制御部と、を有し、
前記所定の情報は、前記ユーザ端末がアンライセンスバンドでLBT(Listen Before Talk)を行うサブフレームで送信されることを特徴とする無線基地局。 - アンライセンスバンドを用いて無線基地局と通信可能なユーザ端末の無線通信方法であって、
アンライセンスバンドのチャネル状態を、センシングサブフレームでLBT(Listen Before Talk)を行って検出する工程と、
所定のサブフレームを前記センシングサブフレームとして制御する工程と、
前記LBTの結果に基づいて、PUSCH送信に関する所定の情報を、前記センシングサブフレームで送信する工程と、を有することを特徴とする無線通信方法。
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JP7161549B2 (ja) | 2018-09-27 | 2022-10-26 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ | 端末及び通信方法 |
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CN106664568B (zh) | 2021-06-29 |
US20200170041A1 (en) | 2020-05-28 |
US11490421B2 (en) | 2022-11-01 |
JP6609252B2 (ja) | 2019-11-20 |
JPWO2016017327A1 (ja) | 2017-05-25 |
JP6865504B2 (ja) | 2021-04-28 |
US20170265225A1 (en) | 2017-09-14 |
JP2020025318A (ja) | 2020-02-13 |
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