WO2017077950A1 - 無線端末及び基地局 - Google Patents
無線端末及び基地局 Download PDFInfo
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- WO2017077950A1 WO2017077950A1 PCT/JP2016/081998 JP2016081998W WO2017077950A1 WO 2017077950 A1 WO2017077950 A1 WO 2017077950A1 JP 2016081998 W JP2016081998 W JP 2016081998W WO 2017077950 A1 WO2017077950 A1 WO 2017077950A1
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- side link
- wireless terminal
- gap
- setting
- serving cell
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/30—Connection release
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0088—Scheduling hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
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- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W8/00—Network data management
- H04W8/005—Discovery of network devices, e.g. terminals
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- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/18—Interfaces between hierarchically similar devices between terminal devices
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- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
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- H04W88/02—Terminal devices
- H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
Definitions
- This application relates to a wireless terminal and a base station used in a communication system.
- 3GPP 3rd Generation Partnership Project
- ProSe Proximity based Service
- ProSe defines direct discovery (ProSe Direct Discovery) and direct discovery (ProSe Direct Communication).
- Direct discovery is an operation for discovering other wireless terminals in the vicinity of the wireless terminal.
- Direct communication is an operation for communicating on a direct terminal-to-terminal interface.
- Direct discovery and direct communication constitute a side link (side link operation).
- the wireless terminal can execute a side link operation using a direct terminal interface.
- the wireless terminal includes a controller that sets a side link gap for performing the side link operation at a frequency to which a neighboring cell different from a serving cell belongs, a predetermined message for indicating that the side link operation is not interested, or the wireless A transmitter that transmits a measurement report related to a radio environment of the terminal to the serving cell.
- the controller autonomously cancels the setting of the side link gap without receiving a message for canceling the setting of the side link gap from the serving cell. To do.
- the base station includes a controller that sets a side link gap in a radio terminal for performing a side link operation in which a direct inter-terminal interface is used at a frequency to which a neighboring cell different from a serving cell belongs; A receiver that receives from the wireless terminal a predetermined message for indicating that the user is not interested in the side link operation or a measurement report regarding the wireless environment of the wireless terminal.
- the controller receives the predetermined message or the measurement report, the side link gap setting is released without transmitting a message for releasing the side link gap setting to the wireless terminal. to decide.
- the wireless terminal can execute a side link operation using a direct terminal interface.
- the wireless terminal satisfies a condition for transmitting a measurement report related to a wireless environment of the wireless terminal and a controller that sets a side link gap for performing the side link operation at a frequency to which a neighboring cell different from the serving cell belongs.
- a transmitter that transmits the measurement report to the serving cell even during the side link gap.
- FIG. 1 is a diagram illustrating a configuration of an LTE system.
- FIG. 2 is a protocol stack diagram of a radio interface in the LTE system.
- FIG. 3 is a configuration diagram of a radio frame used in the LTE system.
- FIG. 4 is a block diagram of the UE 100.
- FIG. 5 is a block diagram of the eNB 200.
- FIG. 6 is a sequence diagram for explaining the operation according to the first embodiment.
- FIG. 7 is a sequence diagram for explaining an operation according to the second embodiment.
- FIG. 8 is a diagram illustrating the side link gap setting according to the supplementary notes.
- the radio terminal can execute a side link operation in which a direct inter-terminal interface is used.
- the wireless terminal includes a controller that sets a side link gap for performing the side link operation at a frequency to which a neighboring cell different from a serving cell belongs, a predetermined message for indicating that the side link operation is not interested, or the wireless A transmitter that transmits a measurement report related to a radio environment of the terminal to the serving cell.
- the controller autonomously cancels the setting of the side link gap without receiving a message for canceling the setting of the side link gap from the serving cell. To do.
- the transmitter may transmit a message not including information indicating that the wireless terminal is interested in the side link operation as the predetermined message.
- the transmitter may transmit, as the predetermined message, a message that does not include information on radio resources that the radio terminal requests for the side link operation.
- the transmitter may transmit a message including information indicating release of the side link gap as the predetermined message.
- the transmitter may transmit a scheduling request for transmitting the measurement report to the serving cell.
- the controller may autonomously cancel the setting of the side link gap when the scheduling request is transmitted.
- the controller may start monitoring a control signal from the serving cell when the measurement report is transmitted.
- the controller may set a plurality of side link gaps corresponding to different frequencies.
- the transmitter may transmit a message including information for determining a frequency at which the wireless terminal is not interested in the side link operation as the predetermined message.
- the controller may autonomously cancel the setting of a side link gap corresponding to a frequency at which the wireless terminal is not interested in the side link operation among the plurality of side link gaps.
- the controller may set a plurality of side link gaps corresponding to different PLMNs (Public Land Mobile Network).
- the transmitter may transmit a message including information for determining a PLMN that the wireless terminal is not interested in the side link operation as the predetermined message.
- the controller may autonomously cancel the setting of a side link gap corresponding to a PLMN in which the wireless terminal is not interested in the side link operation among the plurality of side link gaps.
- the base station includes a controller that sets a side link gap in a radio terminal for performing a side link operation in which a direct inter-terminal interface is used at a frequency to which a neighboring cell different from a serving cell belongs; A receiver for receiving a predetermined message for indicating that the user is not interested in the operation or a measurement report regarding a wireless environment of the wireless terminal from the wireless terminal.
- the controller receives the predetermined message or the measurement report, the side link gap setting is released without transmitting a message for releasing the side link gap setting to the wireless terminal. to decide.
- the controller When the controller does not transmit a handover instruction for handing over the wireless terminal based on the measurement report after the measurement report is received, the controller sets information for setting the side link gap in the wireless terminal. May be transmitted to the wireless terminal.
- the wireless terminal according to the embodiment can perform a side link operation using a direct inter-terminal interface.
- the wireless terminal satisfies a condition for transmitting a measurement report related to a wireless environment of the wireless terminal and a controller that sets a side link gap for performing the side link operation at a frequency to which a neighboring cell different from the serving cell belongs.
- a transmitter that transmits the measurement report to the serving cell even during the side link gap.
- the transmitter may be prohibited from transmitting user data in the uplink during the side link gap.
- the transmitter may be prohibited from transmitting a delivery confirmation signal for a radio signal from the serving cell during the side link gap.
- the transmitter transmits the measurement report even during the side link gap only when a predetermined condition is satisfied among a plurality of conditions for transmitting a measurement report regarding a wireless environment of the wireless terminal. You may transmit to the serving cell.
- the transmitter may transmit the measurement report to the serving cell even during the side link gap only when permitted by the serving cell.
- the “side link operation” may be replaced with “direct discovery” or “direct communication”.
- 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 Universal Terrestrial Radio Access Network) 10, and an EPC (Evolved Packet Core) 20.
- a server 400 is provided in an external network that is not managed by an operator of the cellular network.
- the UE 100 corresponds to a wireless terminal.
- the UE 100 is a mobile communication device.
- the UE 100 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.
- ENB 200 manages one or a plurality of cells.
- the eNB 200 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 wireless communication area.
- Cell is also used as a term indicating a function of performing wireless communication with the UE 100.
- the EPC 20 corresponds to a core network.
- the EPC 20 includes a MME (Mobility Management Entity) / S-GW (Serving-Gateway) 300 and a P-GW (Packet Data Network Gateway) 350.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- P-GW Packet Data Network 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.
- the P-GW 350 performs control for relaying user data from the external network (and to the external network).
- the Server 400 is, for example, a ProSe application server (ProSe Application Server).
- the Server 400 manages an identifier used in ProSe.
- the server 400 stores “EPC ProSe user ID” and “ProSe function ID”. Further, the server 400 maps “application layer user ID” and “EPC ProSe user ID”.
- the Server 400 may have a ProSe function.
- the ProSe function is a logical function used for network-related operations necessary for ProSe.
- the ProSe function plays a different role for each feature of ProSe.
- the server 400 may be a network device having only the ProSe function.
- FIG. 2 is a protocol stack diagram of a radio interface in the LTE system. As shown in FIG. 2, the radio interface protocol is divided into the first to third layers of the OSI reference model.
- the first layer includes 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 signals 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 signals 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. The scheduler determines the uplink / downlink transport format (transport block size, modulation / coding scheme (MCS)) and the resource blocks allocated to the UE 100.
- 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 signals 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 signals. 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 connection between the RRC of the UE 100 and the RRC of the eNB 200
- the UE 100 is in the RRC connected state (connected state).
- RRC connection connection between the RRC of the UE 100 and the RRC of the eNB 200
- the UE 100 is in the RRC idle state (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 Frequency 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.
- the length of each slot is 0.5 ms.
- Each subframe includes a plurality of resource blocks (RB) in the frequency direction.
- Each subframe 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).
- the frequency resource can be specified by the resource block.
- the 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 a downlink control signal. Details of the PDCCH will be described later.
- the remaining part of each subframe is an area that can be used as a physical downlink shared channel (PDSCH) mainly for transmitting downlink data.
- PDSCH physical downlink shared channel
- both ends in the frequency direction in each subframe are regions used mainly as physical uplink control channels (PUCCH) for transmitting uplink control signals.
- 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.
- PUSCH physical uplink shared channel
- ProSe Proximity-based Services
- a direct radio link that does not go through the eNB 200.
- a direct radio link in ProSe is referred to as a “side link”.
- “Sidelink” is a UE-UE interface for direct discovery and direct communication. “Sidelink” corresponds to the PC5 interface.
- the PC 5 is a reference point between UEs that can use the proximity service used for direct discovery, direct communication and UE / network relay by proximity service, and for the user plane.
- the PC5 interface is a UE-UE interface in ProSe.
- Direct discovery is a mode in which a partner is searched by directly transmitting a discovery signal that does not designate a specific destination between UEs.
- Direct discovery is a procedure for discovering another UE in the vicinity of the UE using a direct radio signal in E-UTRA (Evolved Universal Terrestrial Radio Access) via the PC 5.
- E-UTRA Evolved Universal Terrestrial Radio Access
- the direct discovery is a procedure adopted by the UE 100 capable of executing the proximity service in order to discover other UEs 100 capable of executing the proximity service using only the capability of the two UEs 100 with the E-UTRA technology.
- Direct discovery is supported only when UE 100 is served by E-UTRAN (eNB 200 (cell)). When the UE 100 is connected to the cell (eNB 200) or located in the cell, the UE 100 can be provided with service by the E-UTRAN.
- Type 1 There are “type 1” and “type 2 (type 2B)” as resource allocation types for transmission (announcement) of discovery signals (discovery messages).
- Type 1 the UE 100 selects a radio resource.
- type 2 type 2B
- the eNB 200 allocates radio resources.
- the “Sidelink Direct Discovery” protocol stack includes a physical (PHY) layer, a MAC layer, and a ProSe protocol.
- a discovery signal is transmitted between a physical layer of UE (A) and a physical layer of UE (B) via a physical channel called a physical side link discovery channel (PSDCH).
- a discovery signal is transmitted between the MAC layer of UE (A) and the MAC layer of UE (B) via a transport channel called a side link discovery channel (SL-DCH).
- Direct communication is a mode in which data is directly transmitted between UEs by specifying a specific destination (destination group).
- Direct communication is communication between two or more UEs capable of performing proximity services by user plane transmission using E-UTRA technology via a path that does not pass through any network node.
- the direct communication resource allocation type includes “mode 1” and “mode 2”.
- mode 1 the eNB 200 designates radio resources for direct communication.
- mode 2 the UE 100 selects a radio resource for direct communication.
- the direct communication protocol stack includes a physical (PHY) layer, a MAC layer, an RLC layer, and a PDCP layer.
- a control signal is transmitted between the physical layer of UE (A) and the physical layer of UE (B) via a physical side link control channel (PSCCH).
- PSCCH physical side link control channel
- Data is transmitted between the physical layer of UE (A) and the physical layer of UE (B) via a physical side link shared channel (PSSCH).
- a synchronization signal or the like may be transmitted via a physical side link broadcast channel (PSBCH).
- PSBCH physical side link broadcast channel
- Data is transmitted between the MAC layer of UE (A) and the MAC layer of UE (B) via a transport channel called a side link shared channel (SL-SCH).
- SL-SCH side link shared channel
- STCH side link traffic channel
- FIG. 4 is a block diagram of the UE 100.
- the UE 100 includes a receiver (receiver) 110, a transmitter (transmitter) 120, and a controller (controller) 130.
- the receiver 110 and the transmitter 120 may be an integrated transceiver (transmission / reception unit).
- the receiver 110 performs various types of reception under the control of the controller 130.
- the receiver 110 includes an antenna.
- the receiver 110 converts a radio signal received by the antenna into a baseband signal (received signal).
- the receiver 110 outputs a baseband signal to the controller 130.
- the receiver 110 can simultaneously receive radio signals at two different frequencies.
- the UE 100 includes two receivers 110 (2 RX Chain).
- the UE 100 can receive a radio signal for cellular by one receiver 110.
- the UE 100 can receive a radio signal for ProSe by the other receiver 110.
- the transmitter 120 performs various transmissions under the control of the controller 130.
- the transmitter 120 includes an antenna.
- the transmitter 120 converts the baseband signal (transmission signal) output from the controller 130 into a radio signal.
- the transmitter 120 transmits a radio signal from the antenna.
- the controller 130 performs various controls in the UE 100.
- the controller 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 and a CPU (Central Processing Unit).
- the baseband processor performs modulation / demodulation and encoding / decoding of the baseband signal.
- the CPU performs 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.
- the UE 100 may include a GNSS receiver.
- the GNSS receiver receives a GNSS signal in order to obtain position information indicating the geographical position of the UE 100.
- the GNSS receiver outputs the received signal to the controller 130.
- UE100 may have a GPS function for acquiring position information of UE100.
- the process (operation) executed by the UE 100 described below is executed by at least one of the receiver 110, the transmitter 120, and the controller 130 included in the UE 100, but will be described as a process executed by the UE 100 for convenience.
- FIG. 5 is a block diagram of the eNB 200.
- the eNB 200 includes a receiver (reception unit) 210, a transmitter (transmission unit) 220, a controller (control unit) 230, and a network interface 240.
- the transmitter 210 and the receiver 220 may be an integrated transceiver (transmission / reception unit).
- the receiver 210 performs various types of reception under the control of the controller 230.
- the receiver 210 includes an antenna.
- the receiver 210 converts a radio signal received by the antenna into a baseband signal (received signal).
- the receiver 210 outputs a burst band signal to the controller 230.
- the transmitter 220 performs various transmissions under the control of the controller 230.
- the transmitter 220 includes an antenna.
- the transmitter 220 converts the baseband signal (transmission signal) output from the controller 230 into a radio signal.
- the transmitter 220 transmits a radio signal from the antenna.
- the controller 230 performs various controls in the eNB 200.
- the controller 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 and a CPU (Central Processing Unit).
- the baseband processor performs modulation / demodulation and encoding / decoding of the baseband signal.
- the CPU performs various processes by executing programs stored in the memory.
- the processor executes various processes described later and various communication protocols described above.
- the network interface 240 is connected to the neighboring eNB 200 via the X2 interface.
- the network interface 240 is connected to the MME / S-GW 300 via the S1 interface.
- the network interface 240 is used for communication performed on the X2 interface and communication performed on the S1 interface.
- the process (operation) executed by the eNB 200 described below is executed by at least one of the transmitter 210, the receiver 220, the controller 230, and the network interface 240 included in the eNB 200, but will be described as a process executed by the eNB 200 for convenience.
- FIG. 6 is a sequence diagram for explaining the operation according to the first embodiment.
- the UE 100 is located in a cell (serving cell) managed by the eNB 200.
- the UE 100 is in an idle state or a connected state in the serving cell.
- UE100 exists in the cell (neighbor cell) which the other eNB200 manages.
- UE100 is a state which can receive the radio signal from a cell (eNB), when located in the cell.
- ENB 200 operates a serving cell at the first frequency. Therefore, the serving cell belongs to the first frequency.
- the other eNB 200 may operate a cell (neighboring cell) at the first frequency (Intra-frequency).
- the other eNB 200 may operate the cell at a second frequency (Intra-frequency) different from the first frequency.
- the eNB 200 and the other eNB 200 may belong to the same PLMN (Intra-PLMN).
- the eNB 200 and another eNB 200 may belong to different PLMNs (Inter-PLMN).
- the operation of the eNB 200 may be appropriately described as a cell operation.
- the eNB 200 (serving cell) transmits setting information to the UE 100.
- the eNB 200 transmits the setting information in order to set the UE 100 to the side link gap for the UE 100 to perform the side link operation at the frequency to which the neighboring cell belongs.
- the eNB 200 may transmit the setting information for the UE 100 to perform the side link operation at the same frequency as the frequency to which the serving cell belongs.
- the eNB 200 may transmit the setting information for the UE 100 to perform the side link operation in the serving cell.
- the eNB 200 may transmit the setting information by dedicated signaling (RRC connection reconfiguration message).
- the eNB 200 may transmit the setting information by common signaling (for example, SIB (System Information Block)).
- SIB System Information Block
- the eNB 200 may transmit the setting information to the UE 100 in response to the side link gap setting request from the UE 100.
- step S120 the UE 100 sets (applies) a side link gap based on the setting information.
- the side link gap is a gap (period) for performing a side link operation at a frequency (Intra-frequency and / or Inter-frequency) to which a neighboring cell different from the serving cell belongs.
- the UE 100 may perform the side link operation at the same frequency (Intra-frequency) as the frequency to which the serving cell belongs.
- the UE 100 may perform a side link operation in the serving cell.
- the side link gap may be a period in which communication with the serving cell (for example, PDCCH reception obligation) is exempted.
- UE100 performs a sidelink operation
- the side link operation is an operation in which a direct terminal interface (PC5) is used.
- the UE 100 can perform at least one of direct discovery (reception (monitoring) and / or transmission (announcement)) and direct communication (reception and / or transmission) as a side link operation.
- step S130 UE100 performs the process of step S130, when it loses interest in side link operation
- step S130 the UE 100 transmits a predetermined message for indicating that the user is not interested in the side link operation to the serving cell (eNB 200).
- the UE 100 can use, for example, a Sidelink UE Information message used to indicate side link information to the eNB 200 as the predetermined message.
- the UE 100 may transmit a message that does not include information (for example, discRxInterest, commRxInterestedFreq, etc.) indicating that the UE 100 is interested in the side link operation as the predetermined message. For example, when the UE 100 is no longer interested in receiving the direct discovery, the UE 100 transmits, as a predetermined message, a message that does not include information (discRxInterest) indicating that the UE 100 is interested in monitoring the direct discovery announcement to the serving cell. Also good. When the UE 100 is no longer interested in receiving direct communication, the UE 100 may transmit, as a predetermined message, a message that does not include information (commRxInterestedFreq) indicating a frequency of interest in receiving direct communication to the serving cell.
- information for example, discRxInterest, commRxInterestedFreq, etc.
- the UE 100 may transmit, as the predetermined message, a message that does not include information (for example, discTxResourceReq, commTxResourceReq, etc.) related to radio resources requested by the UE 100 for the side link operation to the serving cell. For example, if the UE 100 is no longer interested in transmission of direct discovery (request for transmission resource), a message that does not include information on radio resources (for example, discTxResourceReq) requested by the UE 100 for transmission of direct discovery as a predetermined message. May be sent.
- discTxResourceReq is information indicating the number of discovery messages (number of separate discovery messages) that the UE desires to transmit in each discovery period.
- the UE 100 When the UE 100 is no longer interested in transmission of direct communication (request for transmission resource), the UE 100 transmits a message that does not include information on the radio resource that the UE 100 requests for transmission of direct communication (for example, comTxResourceReq) as a predetermined message. May be.
- the commTxResourceReq is information indicating not only the direct communication destination for the UE 100 to request allocation of individual resources to the E-UTRAN (eNB 200) but also the frequency at which the UE 100 is interested in the direct communication transmission.
- the UE 100 may transmit a message including information indicating the release of the side link gap (for example, a message requesting the release of the side link gap) to the serving cell.
- Information indicating the release of the side link gap may be stored in a field for requesting the setting of the side link gap.
- the field may be provided in the SidelinkUEInformation message or may be provided in another message.
- step S140 when a predetermined message for indicating that the UE 100 is not interested in the side link operation is transmitted, the UE 100 does not receive a message for canceling the setting (application) of the side link gap from the serving cell.
- the setting (application) of the side link gap is released autonomously.
- the UE 100 cancels the setting of the side link gap when a predetermined message is transmitted (for example, a subframe).
- the UE 100 may cancel the setting of the side link gap when the eNB 200 receives a predetermined message (for example, a subframe).
- the UE 100 may cancel the setting of the side link gap after a predetermined period (for example, several subframes) after transmitting the predetermined message.
- step S150 when the eNB 200 receives a predetermined message for indicating that it is not interested in the side link operation, the eNB 200 does not transmit a message for canceling the setting of the side link gap to the UE 100. It is determined that the gap setting has been released (autonomously). The eNB 200 may determine that the setting of the side link gap has been canceled when a predetermined message for indicating that the side link operation is not interested is received (for example, a subframe). The eNB 200 may determine that the setting of the side link gap has been canceled when the UE 100 transmits a predetermined message (for example, a subframe).
- the eNB 200 may cancel the setting of the side link gap after a predetermined period (for example, several subframes) after receiving the predetermined message.
- the predetermined period may be set in advance (pre-configured).
- the eNB 200 may transmit by dedicated signaling (RRC connection reconfiguration message).
- the setting information may be transmitted by common signaling (for example, SIB (System Information Block)).
- the UE 100 when the UE 100 transmits a predetermined message indicating that it is not interested in the side link operation, the UE 100 does not receive a message for canceling the setting of the side link gap from the serving cell (eNB 200). Release the side link gap setting autonomously.
- the eNB 200 receives a predetermined message, the eNB 200 determines that the setting of the side link gap is released without transmitting a message for releasing the setting of the side link gap to the UE 100. Therefore, the setting of the side link gap set in the UE 100 is implicitly canceled. Thereby, every time the UE 100 is not interested in the side link operation, the eNB 200 does not have to transmit a message for canceling the setting of the side link gap, so that signaling can be reduced.
- the UE 100 transmits a predetermined message to the serving cell (eNB 200).
- the predetermined message includes information for determining a frequency at which the UE 100 is not interested in the side link operation.
- the UE 100 may transmit a list to the serving cell as information for determination.
- the list includes (only) frequencies in which the UE 100 is interested in sidelink operations (direct discovery transmission (and / or reception) and / or direct communication transmission (and / or reception)).
- the UE 100 may transmit a Sidelink UE Information message including the list to the serving cell.
- the UE 100 When the UE 100 transmits a list of frequencies that are interested in the side link operation, the UE 100 selects a side link gap corresponding to a frequency that is not interested in the side link operation among the plurality of side link gaps that are already set in the UE 100.
- the setting may be released autonomously. That is, the UE 100 may autonomously cancel the setting of the side link gap corresponding to a frequency that is not included in the list of frequencies of interest. Therefore, the UE 100 maintains the setting of the side link gap corresponding to the frequency included in the list of frequencies of interest.
- the UE 100 may transmit a list of frequencies (only) for requesting the setting of the side link gap as information for determination.
- UE100 may transmit the list
- the UE 100 may include a list of frequencies (only) for requesting the setting of the side link gap in the message requesting the setting of the side link gap.
- the UE 100 may include a list of frequencies (only) for requesting cancellation of the side link gap setting in the message requesting cancellation of the side link gap setting.
- the UE 100 When the UE 100 transmits a list of frequencies that request the setting of the side link gap, the UE 100 sets the side link gap corresponding to the frequency that does not require the setting of the side link gap among the plurality of side link gaps that are already set in the UE 100.
- the setting may be released autonomously. That is, the UE 100 may autonomously cancel the setting of the side link gap corresponding to the frequency that is not included in the list of frequencies that request the setting of the side link gap. Therefore, the UE 100 maintains the setting of the side link gap corresponding to the frequency that requires the setting of the side link gap.
- the side link corresponding to the frequency that requests the setting cancellation of the side link gap among the plurality of side link gaps already set in the UE 100 may be released autonomously. That is, the UE 100 may autonomously cancel the setting of the side link gap corresponding to the frequency included in the list of frequencies that request the cancellation of the setting of the side link gap.
- Each list described above is a list indicated by frequency information (for example, a frequency identifier (EARFCN), a center frequency, etc.).
- frequency information for example, a frequency identifier (EARFCN), a center frequency, etc.
- ENB200 judges that the setting of the side link gap corresponding to the frequency which is not interested in sidelink operation
- the eNB 200 can determine that among the plurality of side link gaps set for the UE 100, the setting of the side link gap corresponding to the frequency at which the UE 100 is not interested in the side link operation is released.
- the eNB 200 can determine that the setting of the side link gap corresponding to the frequency that is not included in the list of frequencies that require setting of the side link gap among the plurality of side link gaps set in the UE 100 has been released.
- the eNB 200 can determine that the setting of the side link gap corresponding to the frequency included in the list of frequencies for which the setting cancellation of the side link gap is requested among the plurality of side link gaps set to the UE 100 has been released.
- the UE 100 transmits a predetermined message to the serving cell (eNB 200).
- the predetermined message includes information for the UE 100 to determine a PLMN that is not interested in the side link operation.
- the information for determination is, for example, information obtained by replacing the above frequency with PLMN (PLMN ID).
- ENB200 judges that the setting of the side link gap corresponding to the PLMN that is not interested in the sidelink operation is canceled based on the information for judgment when the information for judgment is received from the UE100.
- the UE 100 transmits a predetermined message to the serving cell (eNB 200).
- the predetermined message includes information for determining a neighboring cell in which the UE 100 is not interested in the side link operation.
- the information for determination is, for example, information obtained by replacing the above-described frequency with a neighboring cell (Cell ID).
- ENB200 judges that the setting of the side link gap corresponding to the neighboring cell which is not interested in the sidelink operation is canceled based on the information for judgment when the information for judgment is received from the UE100.
- the UE 100 can execute the first to third case operations in appropriate combination.
- each of the above-described lists may be configured as “ ⁇ frequency (option), PLMN ID (option), (Cell ID (option)) ⁇ ”.
- the UE 100 can release the setting of the side link gap flexibly.
- the eNB 200 does not need to transmit a message for canceling the setting of the side link gap, and thus signaling can be reduced.
- FIG. 7 is a sequence diagram for explaining an operation according to the second embodiment.
- the UE 100 autonomously cancels the setting (application) of the side link gap.
- the description will be made on the assumption that the eNB 200 has set a side link gap in the UE 100.
- the description will proceed assuming that cellular communication is not permitted.
- the eNB 200 (serving cell) transmits setting information (Measurement config.) To the UE 100 in order to set a measurement report related to the radio environment of the UE 100 to the UE 100.
- the eNB 200 may transmit the setting information by dedicated signaling (RRC connection reconfiguration message).
- the eNB 200 may transmit the setting information by common signaling (for example, SIB (System Information Block)).
- the eNB 200 may include, in the setting information, permission information that permits transmission of the measurement report even during the side link gap.
- the eNB 200 may include permission information in information (ReportConfigEUTRA) that specifies a condition (event) for transmitting a measurement report.
- the permission information may be flag information (an identifier indicating that transmission of a measurement report is permitted (prohibited) during the side link gap). Each event may be associated with permission information.
- the UE 100 measures and records a radio signal from a cell (serving cell / neighbor cell) based on the setting information. The UE 100 performs a side link operation during the set side link gap.
- step S220 measurement report transmission is triggered during the side link gap. That is, the condition for transmitting the measurement report is satisfied (occurrence of an event).
- the UE 100 executes the process of step S230 even during the side link gap.
- UE100 may perform the process of step S230 only when a predetermined condition (for example, event A4) is satisfied among a plurality of conditions for transmitting a measurement report.
- the predetermined condition may be preset information (pre-configured).
- the predetermined condition may be notified from the eNB 200 by broadcast.
- the UE 100 may execute the process of step S230 only when it is permitted from the eNB 200 (serving cell).
- the UE 100 may execute the process of step S230 when receiving permission information.
- the UE 200 may execute the process of step S230 when an event associated with the permission information occurs.
- the UE 100 exceptionally transmits a scheduling request (SR) to the eNB 200 (serving cell) even during the side link gap.
- the UE 100 may transmit a scheduling request to the eNB 200 in order to transmit the measurement report.
- the UE 100 may autonomously cancel the side link gap setting without receiving a message for canceling the side link gap setting from the eNB 200 (serving cell). .
- step S240 the eNB 200 transmits control information (UL grant) for assigning radio resources to the UE 100 to the UE 100 in response to the scheduling request.
- control information UL grant
- step S250 the UE 100 transmits a measurement report to the eNB 200 (serving cell) using the assigned radio resource.
- the UE 100 exceptionally transmits a measurement report to the eNB 200 even during the side link gap.
- the UE 100 When the UE 100 transmits a measurement report to the eNB 200 (serving cell), the UE 100 autonomously cancels the setting of the side link gap without receiving a message for canceling the setting of the side link gap from the eNB 200 (serving cell). Also good.
- UE100 may start monitoring the control signal (PDCCH) from the serving cell when transmitting / transmitting the measurement report.
- PDCCH control signal
- step S260 when the eNB 200 determines that the UE 100 is to be handed over based on the measurement report from the UE 100, the eNB 200 can transmit a handover instruction (HO command) to the UE 100.
- the eNB 200 may transmit the setting information for (re) setting the side link gap to the UE 100 when not transmitting the handover instruction. Thereby, even if UE100 has canceled the side link gap autonomously by transmission of the measurement report, since the side link gap is set, UE100 can restart the sidelink operation.
- the UE 100 transmits the measurement report to the serving cell (eNB 200) even during the side link gap.
- the side link gap is longer than the measurement gap. For this reason, when UE100 transmits a measurement report after a side link gap without transmitting a measurement report during a sidelink gap, handover may fail depending on movement of UE100.
- the UE 100 can reduce the possibility that the handover will fail by transmitting the measurement report to the serving cell even during the side link gap.
- the UE 100 autonomously cancels the setting of the side link gap without receiving a message for canceling the setting of the side link gap from the serving cell (eNB 200). Thereby, UE100 can receive the handover instruction from eNB200 more reliably.
- the eNB 200 determines that the setting of the side link gap is canceled without transmitting a message for canceling the setting of the side link gap to the UE 100. Thereby, since it is not necessary for the eNB 200 to transmit a message for canceling the setting of the side link gap, signaling can be reduced.
- the UE 100 autonomously cancels the setting of the side link gap after transmitting a predetermined message indicating that the UE 100 is not interested in the side link operation.
- the present invention is not limited to this.
- UE100 may transmit the above-mentioned predetermined message (for example, message containing the information which shows the cancellation
- eNB200 serving cell
- the UE 100 when a plurality of side link gaps are set, the UE 100 cancels the setting of at least some of the side link gaps, and then cancels the setting of the side link gap.
- a predetermined message including information (such as information for determining a frequency that is not interested in the side link operation, information for determining a PLMN that is not interested in the side link operation) may be transmitted.
- the UE 100 may transmit the measurement report after autonomously releasing the setting of the side link gap.
- the setting of the side link gap is implicitly canceled, but the present invention is not limited to this.
- the UE 100 transmits a predetermined message and / or a measurement report for indicating that it is not interested in the side link operation
- the UE 100 allocates radio resources (individual radio for transmission and / or reception) allocated from the eNB 200 for the side link operation. Resource) may be released autonomously.
- the eNB 200 may determine that the radio resources allocated to the UE 100 for the side link operation are autonomously released when receiving a predetermined message and / or a measurement report indicating that the side link operation is not interested. . Therefore, “side link gap setting” can be appropriately replaced with “radio resources allocated for side link operation”.
- cellular communication is not permitted during the side link gap (cellular communication is restricted (prohibited)), but is not limited thereto.
- some cellular communication may be restricted during the side link gap.
- the UE 100 may be restricted from transmitting user data (including initial transmission user data and retransmission user data) in the uplink during the side link gap.
- the UE 100 may be restricted from transmitting an acknowledgment signal (positive (ACK) and / or negative (NACK)) for a radio signal from the serving cell during the side link gap.
- ACK positive
- NACK negative
- the UE 100 may be allowed to transmit a measurement report during the side link gap.
- the UE 100 may be allowed to send a scheduling request to send a measurement report during the side link gap.
- the UE 100 may be permitted to monitor control information during the side link gap in order to receive a handover instruction.
- the UE 100 may cancel the setting of the side link gap in order to transmit the measurement report when the condition for transmitting the measurement report is satisfied. Good.
- the UE 100 may cancel the setting of the side link gap when receiving the permission information.
- UE100 does not need to cancel
- the UE 100 may cancel the setting of the side link gap only when an event associated with the permission information occurs.
- the UE 100 may perform an operation for transmitting a measurement report after canceling the setting of the side link gap.
- the eNB 200 may transmit a message for canceling the setting of the side link gap to the UE 100 even when the UE 100 determines that the setting of the side link gap has been autonomously canceled. Good. If the UE 100 receives the message after autonomously releasing the setting of the side link gap, the UE 100 may ignore the message.
- a program for causing a computer to execute each process performed by any of the above-described nodes may be provided.
- the program may be recorded on a computer readable medium. If a computer-readable medium is used, a program can be installed in the computer.
- the computer-readable medium on which the program is recorded may be a non-transitory recording medium.
- the non-transitory recording medium is not particularly limited, but may be a recording medium such as a CD-ROM or a DVD-ROM.
- a chip configured by a memory that stores a program for executing each process performed by either the UE 100 or the eNB 200 and a processor that executes the program stored in the memory may be provided.
- the LTE system has been described as an example of the mobile communication system, but the present invention is not limited to the LTE system, and the content according to the present application may be applied to a system other than the LTE system.
- Proposal 1 All subframes notified in the side link gap request should be allowed transmission and reception subframes.
- the subframe for transmission and the subframe for reception should be reported separately (ie, one pattern for the transmission subframe and the other pattern for the reception subframe). is there. Also, the subframe pattern should be divided for each frequency that the UE is interested in. Each subframe pattern should be notified in association with a “tag” such as Tx / Rx, frequency of interest of the UE and / or PLMN ID.
- Proposal 2 The UE should notify the serving cell of different subframe patterns including tags related to transmission / reception, frequencies of interest and / or PLMN ID.
- Proposal 2 is accepted, it may cause excessive signaling overhead. Therefore, it is preferable to allow the UE to notify the serving of the subframe pattern only when the serving cell requires a subframe pattern. Therefore, it is worth considering whether there is a situation where overhead is reduced.
- the serving cell may already know the resource pool settings of neighboring eNBs belonging to other frequencies (and possibly timing offset for SFN alignment). In this case, it is conceivable that the UE notifies only the frequency of interest to the serving cell as the side link gap request. In this way, the serving cell can determine the side link gap for the UE.
- the frequency information is the agreement currently permitted only for the Public Safety use case (ie, in the case of the Public Safe use case, the UE in the RRC connected state should notify the eNB of the frequency for which direct discovery transmission is desired. ”)) Can be reused. The agreement should therefore be strengthened for commercial use cases.
- the serving cell should also provide information on whether the UE includes the subframe pattern in the side link gap request for each frequency.
- Proposal 3 When the eNB knows the resource setting of the frequency, the UE in the RRC connection state indicates only the frequency for which direct discovery for commercial use cases is desirable to the eNB by including it in the SidelinkUEInformation.
- Scenario 1 The UE requests only discovery resources, not side link gaps.
- Inter-frequency discovery transmission is performed when “the network signals“ ... ”and the UE is expected to request a resource from the serving cell for the carrier.”
- scheduled resource allocation is performed as in Rel-12.
- Scenario 2 The UE voluntarily acquires discovery resources and requests a side link gap.
- Inter-frequency discovery transmission is performed when “The network signals“ ... ”and the UE should read the SIB 19 of the signaled carrier voluntarily”.
- the eNB since the eNB knows the transmission resources assigned to the UE, it is clear that the eNB can accurately determine the side link gap for the UE. Whether the side link gap is explicitly or implicitly set when the UE requests a dedicated transmission resource and the UE does not need to send a side link gap request (ie, the side link gap is a resource allocation). Whether it is set with or not) is still unknown.
- Proposal 4 When a UE requests transmission resources from a serving cell, a side link gap request for discovery announcement should not be triggered.
- Proposal 5 When the transmission resource is allocated to the UE by dedicated signaling, it should be considered whether the side link gap is explicitly set in the UE or implicitly set in the UE.
- Proposal 6 If the UE obtains transmission resources from the voluntary SIB 19, the UE should be able to request a gap for discovery announcements.
- the distinction results in a distinction between announcement and monitoring, a distinction by frequency or a distinction by PLMN.
- Separate gaps are expected to provide configuration flexibility.
- a single gap is proposed, which is a simpler configuration with minimal signaling overhead. Considering that the gap is not a resource allocation but simply a period during which the Uu operation can be skipped, excessive flexibility is not necessary.
- the side link gap is an existing specification of the measurement gap (ie, “Note: UE should apply a single gap at the timing for the MCG cell even when set to DC”).
- the UE implementation determines at which frequency the UE will perform discovery announcement / monitoring while the side link gap is set. The degree of freedom may be given to the network, and the balance adjustment between Uu service and discovery performance is determined by the network implementation.
- Proposal 7 Sidelink gap should be indicated by a single pattern of subframes to be considered.
- the UE In the subframe that is part of the measurement gap, the UE shall not perform HARQ feedback and CQI / PMI / RI / PTI transmission, SRS shall not be reported". Easy to do. The question of whether to lower the priority of measurement reports during the side link gap is a further consideration.
- Proposal 8 Side link operation should be prioritized over UL transmission during side link gap.
- Proposal 9 In order to avoid unnecessary handover failures, it should be considered whether or not priority should be given to measurement reports in the side link gap.
- Implicit side link gap cancellation It was agreed that "eNB can cancel the configured transmission / reception gap configuration". This is understood as explicitly releasing the setting of the side link gap by RRC Connection Reconfiguration. An explicit deconfiguration may be initiated for reasons in the serving cell, such as more Uu resources are needed to ensure QoS. On the other hand, it is conceivable that the importance of the side link gap disappears for the reason of the UE side. For example, when the user turns off the discovery function, the side link gap is not necessary. In this case, it is easy for the serving cell to cancel the setting of the side link gap to the UE that has transmitted the side link gap “release” request or the Sidelink UE Information indicating “no longer interested”.
- the side link gap is no longer needed for both the UE and the serving cell when the UE transmits its own UE interest. Therefore, when the UE notifies the serving cell of Sidelink UEInformation not including discRxInterest and / or discTxResourceReq, it is preferable to implicitly cancel the setting of the side link gap as in the existing semi-permanent scheduling.
- Proposal 10 The side link gap should consider whether or not the side link gap should be implicitly released when the UE notifies “no longer interested in discovery”.
- Proposal 11 Whether the measurement report in the side link gap should trigger the implicit release of the side link gap should be considered.
- the present invention is useful in the field of wireless communication.
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Abstract
Description
実施形態に係る無線端末は、直接的な端末間インターフェイスが用いられるサイドリンク動作を実行可能である。前記無線端末は、サービングセルと異なる近隣セルが属する周波数において前記サイドリンク動作を実行するためのサイドリンクギャップを設定するコントローラと、前記サイドリンク動作に興味がないことを示すための所定メッセージ又は前記無線端末の無線環境に関する測定報告を前記サービングセルへ送信するトランスミッタと、を備える。前記コントローラは、前記所定メッセージ又は前記測定報告が送信された場合、前記サイドリンクギャップの設定を解除するためのメッセージを前記サービングセルから受信しなくても、前記サイドリンクギャップの設定を自律的に解除する。
以下において、実施形態に係る移動通信システムであるLTEシステムについて説明する。図1は、LTEシステムの構成を示す図である。
以下において、近傍サービス(ProSe:Proximity-based Services)について説明する。ProSeにおいて、複数のUE100は、eNB200を介さない直接的な無線リンクを介して各種の信号を送受信する。ProSeにおける直接的な無線リンクは、「サイドリンク(Sidelink)」と称される。
以下において、実施形態に係るUE100(無線端末)について説明する。図4は、UE100のブロック図である。図4に示すように、UE100は、レシーバ(Receiver:受信部)110、トランスミッタ(Transmitter:送信部)120、及びコントローラ(Controller:制御部)130を備える。レシーバ110とトランスミッタ120とは、一体化されたトランシーバ(送受信部)であってもよい。
以下において、実施形態に係るeNB200(基地局)について説明する。図5は、eNB200のブロック図である。図5に示すように、eNB200は、レシーバ(受信部)210、トランスミッタ(送信部)220、コントローラ(制御部)230、及びネットワークインターフェイス240を備える。トランスミッタ210とレシーバ220は、一体化されたトランシーバ(送受信部)であってもよい。
次に、第1実施形態に係る動作ついて、図6を用いて説明する。図6は、第1実施形態に係る動作を説明するためのシーケンス図である。
次に、第1実施形態に係る変更例について説明する。具体的には、本変更例では、UE100に複数のサイドリンクギャップが設定(適用)されているケースについて説明する。なお、第1実施形態と同様の部分は、説明を適宜省略する。
次に、第2実施形態について、図7を用いて説明する。図7は、第2実施形態に係る動作を説明するためのシーケンス図である。第2実施形態では、UE100からeNB200へ測定報告が送信される場合に、UE100は、サイドリンクギャップの設定(適用)を自律的に解除する。
上述した各実施形態によって、本出願の内容を説明したが、この開示の一部をなす論述及び図面は、本出願の内容を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施形態、実施例及び運用技術が明らかとなろう。
(1)導入
本付記において、サイドリンクギャップ要求の詳細及び設定が検討される。
(2.1)要求の内容
UEは、ディスカバリ受信及び/又は送信のためのギャップを要求できることが合意された。この要求において、UEは、ディスカバリ受信及び/又は送信のためのギャップが必要とするサブフレーム(サービングセルのタイミングに対応する)をeNBに通知する。このように、例えば、非協調PLMNシナリオの状況下で、サービングセルがUEのために適切なサイドリンクギャップを決定することが可能となる。「送信サブフレームが何に対応するか(全ての許可された送信サブフレームか、UEが意図する送信サブフレームか)」についての問題は、更なる検討事項である。サブフレームがビットマップパターンで示される場合、通知されるサブフレームの定義と関係なく、シグナリングオーバーヘッドに関する状況が同じであり得る。サービングセルがリソーススケジューリングの義務を有することを考慮すると、サブフレーム情報は全て許可されるサブフレームであるべきである。サービングセルがUu通信のQoSを考慮してUEのための適切なギャップパターンを決定することが可能である。
(2.2.1)ディスカバリアナウンスメントのためのギャップ要求
「この要求が何時トリガーされるか」についての問題は、更なる検討事項である。UEがディスカバリ送信に興味を持つ場合に、該UEがどのようにディスカバリ送信を開始するかについて以下の2つのシナリオがある。
ディスカバリモニタリングについて、個別リソース割り当てがない、即ち、共通受信プールのみが利用可能であるため、UEは、ディスカバリアナウンスメントのためのギャップを要求できる。
(3.1)サイドリンクギャップパターン
サイドリンクギャップが単一ギャップに設定されるか別々ギャップに設定されるかについて、結論がない。
(3.2.1)ディスカバリ動作の優先度付け
「受信向けのギャップ中にあるUEが他のDLチャネルをモニターすることが期待されていない(UEは、測定要件を満たす必要がある)。」ことが合意された。しかし、ディスカバリアナウンスメント向けのサイドリンクギャップ中のUu動作をどのようにハンドルするか(即ち、ディスカバリアナウンスメントよりも、SRS、PUCCH(ACK/NACKを含む)、HARQ再送及び/又は新ULデータを優先させるべきであるか)についての問題は、更なる検討事項である。リソーススケジューリング及びギャップ設定の義務がサービングセルにあることを考慮すると(即ち、Uuスケジューリングを考慮しながら許容可能なギャップパターンをUE設定するために)、サイドリンクギャップ中に、Uuよりもサイドリンク動作を優先させるべきである。既存の測定ギャップのハンドリング「メジャーメントギャップの一部であるサブフレームにおいて、UEがHARQフィードバック及びCQI/PMI/RI/PTIの送信を実行してはならない、SRSが報告されてはならない。」に従うことが簡単である。サイドリンクギャップ中に測定報告の優先度を下げるべきかについての問題は、更なる検討事項である。
提案8が合意可能である場合に、サイドリンクギャップ中に、UL送信が実行されてはいかない。各UuベアラのQoSがサービングセルによって確保され得るが、UEモビリティについての懸念(即ち、サイドリンクギャップに起因するハンドオーバ失敗)がある。Rel-12のディスカバリ送信において、サービングセルが自セルのULスペクトル上でディスカバリリソースを提供する場合であっても、ディスカバリ送信が1つのみの周波数(即ち、サービング周波数)上に行われるので、ハンドオーバ失敗は問題とならない。Rel-13のinter-carrier/PLMNのディスカバリを考慮すると、複数周波数上のディスカバリ送信/受信にサイドリンクギャップが適用されるようになるので、ギャップ期間はRel-12のディスカバリプールパータンよりも長くなり、UEにとって測定報告を送信する機会が少なくなり、よって、ハンドオーバ失敗が増加する。勿論、このようなハンドオーバ失敗を防ぐために、サービングセルがUEに短いサイドリンクギャップをグラントするという1つのオプションはあるが、ディスカのバリパーフォーマンスの劣化を引き起こすことがあり、即ち、ケースバイケースで両方のパーフォーマンスのバランスを取ることが困難である。よって、サイドリンクギャップ中に測定報告が許可されるべきか否かを検討すべきである。
「eNBは、設定された送信/受信ギャップの設定を解除できる」ということが合意された。これは、RRC Connection Reconfigurationによってサイドリンクギャップの設定を明示的に解除するとして理解されている。QoS確保のためにより多くのUu用のリソースが必要とする等の、サービングセルにおける理由のために、明示的な設定解除が開始され得る。一方、UE側の理由でサイドリンクギャップの重要性がなくなることも考えられる。例えば、ユーザがディスカバリ機能をオフにする場合に、サイドリンクギャップの必要もなくなる。この場合、サービングセルは、サイドリンクギャップ「解放」要求又は「もはや興味がない」を示すSidelinkUEInformationを送信したUEに対して、サイドリンクギャップの設定を解除することが簡単である。しかしながら、UEが、自UEの興味なさを送信する場合に、UE及びサービングセルの両方に対して、サイドリンクギャップの必要がなくなることが明らかである。よって、discRxInterest及び/又はdiscTxResourceReqを含まないSidelinkUEInformationをUEがサービングセルに通知する場合に、既存の半永久的なスケジューリングのように、サイドリンクギャップの設定を暗黙的に解除することが好ましい。
Claims (15)
- 直接的な端末間インターフェイスが用いられるサイドリンク動作を実行可能な無線端末であって、
サービングセルと異なる近隣セルが属する周波数において前記サイドリンク動作を実行するためのサイドリンクギャップを設定するコントローラと、
前記サイドリンク動作に興味がないことを示すための所定メッセージ又は前記無線端末の無線環境に関する測定報告を前記サービングセルへ送信するトランスミッタと、を備え、
前記コントローラは、前記所定メッセージ又は前記測定報告が送信された場合、前記サイドリンクギャップの設定を解除するためのメッセージを前記サービングセルから受信しなくても、前記サイドリンクギャップの設定を自律的に解除する無線端末。 - 前記トランスミッタは、前記所定メッセージとして、前記無線端末が前記サイドリンク動作に興味があることを示す情報を含まないメッセージを送信する請求項1に記載の無線端末。
- 前記トランスミッタは、前記所定メッセージとして、前記無線端末が前記サイドリンク動作のために要求する無線リソースに関する情報を含まないメッセージを送信する請求項1に記載の無線端末。
- 前記トランスミッタは、前記所定メッセージとして、前記サイドリンクギャップの解除を示す情報を含むメッセージを送信する請求項1に記載の無線端末。
- 前記トランスミッタは、前記測定報告を送信するためのスケジューリング要求を前記サービングセルへ送信し、
前記コントローラは、前記スケジューリング要求が送信された場合に、前記サイドリンクギャップの設定を自律的に解除する請求項1に記載の無線端末。 - 前記コントローラは、前記測定報告が送信された場合、前記サービングセルからの制御信号のモニタを開始する請求項1に記載の無線端末。
- 前記コントローラは、互いに異なる周波数に対応する複数のサイドリンクギャップを設定しており、
前記トランスミッタは、前記所定メッセージとして、前記無線端末が前記サイドリンク動作に興味がない周波数を判断するための情報を含むメッセージを送信し、
前記コントローラは、前記複数のサイドリンクギャップのうち、前記無線端末が前記サイドリンク動作に興味がない周波数に対応するサイドリンクギャップの設定を自律的に解除する請求項1に記載の無線端末。 - 前記コントローラは、互いに異なるPLMN(Public Land Mobile Network)に対応する複数のサイドリンクギャップを設定しており、
前記トランスミッタは、前記所定メッセージとして、前記無線端末が前記サイドリンク動作に興味がないPLMNを判断するための情報を含むメッセージを送信し、
前記コントローラは、前記複数のサイドリンクギャップのうち、前記無線端末が前記サイドリンク動作に興味がないPLMNに対応するサイドリンクギャップの設定を自律的に解除する請求項1に記載の無線端末。 - サービングセルと異なる近隣セルが属する周波数において、直接的な端末間インターフェイスが用いられるサイドリンク動作を実行するためのサイドリンクギャップを無線端末に設定するコントローラと、
前記サイドリンク動作に興味がないことを示すための所定メッセージ又は前記無線端末の無線環境に関する測定報告を前記無線端末から受信するレシーバと、を備え、
前記コントローラは、前記所定メッセージ又は前記測定報告が受信された場合、前記サイドリンクギャップの設定を解除するためのメッセージを前記無線端末に送信しなくても、前記サイドリンクギャップの設定が解除されたと判断する基地局。 - 前記コントローラは、前記測定報告が受信された後、前記測定報告に基づいて前記無線端末をハンドオーバさせるためのハンドオーバ指示を送信しない場合には、前記サイドリンクギャップを前記無線端末に設定するための情報を前記無線端末に送信する請求項9に記載の基地局。
- 直接的な端末間インターフェイスが用いられるサイドリンク動作を実行可能な無線端末であって、
サービングセルと異なる近隣セルが属する周波数において前記サイドリンク動作を実行するためのサイドリンクギャップを設定するコントローラと、
前記無線端末の無線環境に関する測定報告を送信するための条件が満たされた場合、前記サイドリンクギャップの間であっても、前記測定報告を前記サービングセルに送信するトランスミッタと、を備える無線端末。 - 前記トランスミッタは、前記サイドリンクギャップの間、上りリンクでユーザデータを送信することが禁止される請求項11に記載の無線端末。
- 前記トランスミッタは、前記サイドリンクギャップの間、前記サービングセルからの無線信号に対する送達確認信号を送信することが禁止される請求項11に記載の無線端末。
- 前記トランスミッタは、前記無線端末の無線環境に関する測定報告を送信するための複数の条件のうち、所定の条件が満たされた場合にのみ、前記サイドリンクギャップの間であっても、前記測定報告を前記サービングセルに送信する請求項11に記載の無線端末。
- 前記トランスミッタは、前記サービングセルから許可された場合にのみ、前記サイドリンクギャップの間であっても、前記測定報告を前記サービングセルに送信する請求項11に記載の無線端末。
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