WO2022153548A1 - 端末及び通信方法 - Google Patents
端末及び通信方法 Download PDFInfo
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- WO2022153548A1 WO2022153548A1 PCT/JP2021/001537 JP2021001537W WO2022153548A1 WO 2022153548 A1 WO2022153548 A1 WO 2022153548A1 JP 2021001537 W JP2021001537 W JP 2021001537W WO 2022153548 A1 WO2022153548 A1 WO 2022153548A1
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- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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- H—ELECTRICITY
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- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
- H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
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- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
- H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a terminal and a communication method in a wireless communication system.
- LTE Long Term Evolution
- LTE-A Long Term Evolution Advanced
- NR New Radio
- 5G New Radio
- Non-Patent Document 1 Non-Patent Document 1
- D2D reduces the traffic between the terminal and the base station, and enables communication between the terminals even if the base station becomes unable to communicate in the event of a disaster or the like.
- D2D is referred to as "sidelink", but in the present specification, D2D, which is a more general term, is used. However, in the description of the embodiment described later, a side link is also used if necessary.
- D2D communication includes D2D discovery (also referred to as D2D discovery) for discovering other terminals that can communicate, and D2D communication (D2D direct communication, D2D communication, direct communication between terminals) for direct communication between terminals. It is also roughly divided into communication, etc.).
- D2D communication, D2D discovery, etc. are not particularly distinguished, they are simply referred to as D2D.
- a signal transmitted / received in D2D is called a D2D signal.
- Various use cases of services related to V2X (Vehicle to Everything) in NR are being studied (for example, Non-Patent Document 2).
- Power saving is being considered as a strengthening of the NR side link.
- the terminal executes partial sensing that senses a limited resource in the sensing window, and the terminal performs partial sensing. Based on the result, select available resource candidates from the resource selection window.
- the terminal 20A may share information indicating a resource set with the terminal 20B, and the terminal 20B may consider the information in resource selection for transmission.
- the sensing operation related to the resource allocation in consideration of the sleep period is not specified.
- the present invention has been made in view of the above points, and an object of the present invention is to match DRX (Discontinuous reception) operation with communication at the time of autonomous resource selection in direct communication between terminals.
- DRX Continuous reception
- the resource pool controls the receiving unit that receives control information from other terminals and the operation related to DRX (Discontinuous reception), and is based on the control information and the state related to DRX in the resource pool.
- a terminal having a control unit that autonomously selects a resource and a transmission unit that transmits the selected resource to another terminal is provided.
- DRX discontinuous reception
- communication at the time of autonomous resource selection can be matched.
- V2X It is a figure for demonstrating V2X. It is a figure for demonstrating the example (1) of the transmission mode of V2X. It is a figure for demonstrating the example (2) of the transmission mode of V2X. It is a figure for demonstrating the example (3) of the transmission mode of V2X. It is a figure for demonstrating the example (4) of the transmission mode of V2X. It is a figure for demonstrating the example (5) of the transmission mode of V2X. It is a figure for demonstrating the example (1) of the communication type of V2X. It is a figure for demonstrating the example (2) of the communication type of V2X. It is a figure for demonstrating the example (3) of the communication type of V2X. It is a sequence diagram which shows the operation example (1) of V2X.
- LTE Long Term Evolution
- NR Universal Terrestrial Radio Access
- LAN Local Area Network
- the duplex system may be a TDD (Time Division Duplex) system, an FDD (Frequency Division Duplex) system, or other system (for example, Flexible Duplex, etc.). Method may be used.
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- Method may be used.
- "configuring" the radio parameter or the like may mean that a predetermined value is set in advance (Pre-configure), or the base station 10 or The radio parameter notified from the terminal 20 may be set.
- FIG. 1 is a diagram for explaining V2X.
- V2X Vehicle to Everything
- eV2X enhanced V2X
- FIG. 1 V2X is a part of ITS (Intelligent Transport Systems), V2V (Vehicle to Vehicle) which means a communication mode between vehicles, and a roadside installed between a vehicle and a roadside.
- ITS Intelligent Transport Systems
- V2V Vehicle to Vehicle
- V2I Vehicle to Infrastructure
- V2N Vehicle to Network
- V2P Vehicle to Pedestrian
- V2X using LTE or NR cellular communication and terminal-to-terminal communication is being studied.
- V2X using cellular communication is also referred to as cellular V2X.
- studies are underway to realize large capacity, low delay, high reliability, and QoS (Quality of Service) control.
- LTE or NR V2X it is expected that studies not limited to 3GPP specifications will be promoted in the future. For example, ensuring interoperability, reducing costs by implementing higher layers, using or switching between multiple RATs (Radio Access Technology), supporting regulations in each country, data acquisition, distribution, database management, and LTE or NR V2X platform. It is expected that the usage method will be examined.
- RATs Radio Access Technology
- the communication device is mounted on the vehicle, but the embodiment of the present invention is not limited to this mode.
- the communication device may be a terminal held by a person, the communication device may be a device mounted on a drone or an aircraft, and the communication device may be a base station, an RSU, a relay station (relay node), or the like. It may be a terminal or the like having a scheduling ability.
- SL may be distinguished based on any or combination of UL (Uplink) or DL (Downlink) and the following 1) -4). Further, SL may have another name. 1) Time domain resource allocation 2) Frequency domain resource allocation 3) Reference synchronization signal (including SLSS (Sidelink Synchronization Signal)) 4) Reference signal used for path loss measurement for transmission power control
- SL or UL OFDM Orthogonal Frequency Division Multiplexing
- CP-OFDM Cyclic-Prefix OFDM
- DFT-S-OFDM Discrete Fourier Transform-Spread-OFDM
- Transform Precoded OFDM Transferformed Any of the above OFDM may be applied.
- Mode 3 and Mode 4 are defined regarding the allocation of SL resources to the terminal 20.
- transmission resources are dynamically allocated by DCI (Downlink Control Information) transmitted from the base station 10 to the terminal 20.
- DCI Downlink Control Information
- SPS SemiPersistent Scheduling
- Mode 4 the terminal 20 autonomously selects a transmission resource from the resource pool.
- the slot in the embodiment of the present invention may be read as a symbol, a mini slot, a subframe, a wireless frame, and a TTI (Transmission Time Interval).
- the cell in the embodiment of the present invention may be read as a cell group, a carrier component, a BWP, a resource pool, a resource, a RAT (Radio Access Technology), a system (including a wireless LAN), or the like.
- the terminal 20 is not limited to the V2X terminal, and may be any type of terminal that performs D2D communication.
- the terminal 20 may be a terminal owned by a user such as a smartphone, or may be an IoT (Internet of Things) device such as a smart meter.
- IoT Internet of Things
- FIG. 2 is a diagram for explaining an example (1) of the transmission mode of V2X.
- the base station 10 transmits the side link scheduling to the terminal 20A.
- the terminal 20A transmits PSCCH (Physical Sidelink Control Channel) and PSCH (Physical Sidelink Shared Channel) to the terminal 20B based on the received scheduling (step 2).
- the transmission mode of the side link communication shown in FIG. 2 may be referred to as the side link transmission mode 3 in LTE.
- side link transmission mode 3 in LTE Uu-based side link scheduling is performed.
- Uu is a wireless interface between UTRAN (Universal Terrestrial Radio Access Network) and UE (User Equipment).
- the side link communication transmission mode shown in FIG. 2 may be referred to as side link transmission mode 1 in NR.
- FIG. 3 is a diagram for explaining an example (2) of the transmission mode of V2X.
- terminal 20A transmits PSCCH and PSCH to terminal 20B using autonomously selected resources.
- the transmission mode of the side link communication shown in FIG. 3 may be referred to as the side link transmission mode 4 in LTE.
- the UE In side link transmission mode 4 in LTE, the UE itself executes resource selection.
- FIG. 4 is a diagram for explaining an example (3) of the transmission mode of V2X.
- terminal 20A transmits PSCCH and PSCH to terminal 20B using autonomously selected resources.
- terminal 20B uses autonomously selected resources to transmit PSCCH and PSCH to terminal 20A (step 1).
- the transmission mode of the side link communication shown in FIG. 4 may be referred to as the side link transmission mode 2a in NR.
- the terminal 20 In the side link transmission mode 2 in NR, the terminal 20 itself executes resource selection.
- FIG. 5 is a diagram for explaining an example (4) of the transmission mode of V2X.
- the side link resource pattern is transmitted from the base station 10 to the terminal 20A via the RRC (Radio Resource Control) setting, or is set in advance.
- the terminal 20A transmits the PSCH to the terminal 20B based on the resource pattern (step 1).
- the transmission mode of the side link communication shown in FIG. 5 may be referred to as the side link transmission mode 2c in NR.
- FIG. 6 is a diagram for explaining an example (5) of the transmission mode of V2X.
- the terminal 20A transmits the side link scheduling to the terminal 20B via the PSCCH. Subsequently, the terminal 20B transmits the PSCH to the terminal 20A based on the received scheduling (step 2).
- the transmission mode of the side link communication shown in FIG. 6 may be referred to as the side link transmission mode 2d in NR.
- FIG. 7 is a diagram for explaining an example (1) of the communication type of V2X.
- the sidelink communication type shown in FIG. 7 is unicast.
- Terminal 20A transmits PSCCH and PSCH to terminal 20.
- the terminal 20A unicasts to the terminal 20B and also unicasts to the terminal 20C.
- FIG. 8 is a diagram for explaining an example (2) of the communication type of V2X.
- the sidelink communication type shown in FIG. 8 is group cast.
- Terminal 20A transmits PSCCH and PSCH to the group to which one or more terminals 20 belong.
- the group includes a terminal 20B and a terminal 20C, and the terminal 20A performs a group cast to the group.
- FIG. 9 is a diagram for explaining an example (3) of the communication type of V2X.
- the sidelink communication type shown in FIG. 9 is broadcast.
- Terminal 20A transmits PSCCH and PSCH to one or more terminals 20.
- terminal 20A broadcasts to terminal 20B, terminal 20C and terminal 20D.
- the terminal 20A shown in FIGS. 7 to 9 may be referred to as a header UE.
- HARQ Hybrid automatic repeat request
- SFCI Segmentlink Feedback Control Information
- PSFCH Physical Sidelink Feedback Channel
- PSFCH is used in the transmission of HARQ-ACK on the side link, but this is an example.
- PSCCH may be used to transmit HARQ-ACK on the side link
- PSCH may be used to transmit HARQ-ACK on the side link
- other channels may be used. It may be used to transmit HARQ-ACK on the side link.
- HARQ-ACK all the information reported by the terminal 20 in HARQ will be referred to as HARQ-ACK.
- This HARQ-ACK may be referred to as HARQ-ACK information.
- a codebook applied to the HARQ-ACK information reported from the terminal 20 to the base station 10 or the like is called a HARQ-ACK codebook.
- the HARQ-ACK codebook defines a bit string of HARQ-ACK information.
- NACK is also transmitted by "HARQ-ACK".
- FIG. 10 is a sequence diagram showing an operation example (1) of V2X.
- the wireless communication system according to the embodiment of the present invention may have a terminal 20A and a terminal 20B.
- FIG. 10 shows terminals 20A and terminals 20B as examples.
- terminal 20 terminal 20
- terminal 20B terminal 20
- user device terminal 20
- FIG. 10 shows a case where both the terminal 20A and the terminal 20B are within the coverage of the cell as an example, the operation in the embodiment of the present invention can be applied even when the terminal 20B is outside the coverage.
- the terminal 20 is a device mounted on a vehicle such as an automobile, and has a cellular communication function as a UE in LTE or NR and a side link function. There is.
- the terminal 20 may be a general mobile terminal (smartphone or the like). Further, the terminal 20 may be an RSU.
- the RSU may be a UE type RSU having a UE function or a gNB type RSU having a base station device function.
- the terminal 20 does not have to be a device in one housing.
- the device including the various sensors may be the terminal 20.
- the processing content of the transmission data of the side link of the terminal 20 is basically the same as the processing content of UL transmission in LTE or NR.
- the terminal 20 scrambles and modulates the code word of the transmission data to generate complex-valued symbols, maps the complex-valued symbols (transmission signal) to one or two layers, and performs precoding. Then, precoded complex-valued symbols are mapped to resource elements to generate a transmission signal (example: complex-valued time-domain SC-FDMA signal), which is transmitted from each antenna port.
- the base station 10 has a cellular communication function as a base station in LTE or NR, and a function for enabling communication of the terminal 20 in the present embodiment (example: resource pool setting, resource allocation, etc.). have. Further, the base station 10 may be an RSU (gNB type RSU).
- RSU gNB type RSU
- the signal waveform used by the terminal 20 for SL or UL may be OFDMA, SC-FDMA, or other signal waveform. It may be.
- the terminal 20A autonomously selects the resources to be used for PSCCH and PSCH from the resource selection window having a predetermined period.
- the resource selection window may be set from the base station 10 to the terminal 20.
- the period may be specified by the implementation conditions of the terminal such as the processing time or the maximum allowable delay time of the packet, or the period may be specified in advance by the specifications.
- a predetermined period may be referred to as an interval on the time domain.
- step S102 and step S103 the terminal 20A transmits SCI (Sidelink Control Information) by PSCCH and / or PSCH by using the resource autonomously selected in step S101, and transmits SL data by PSCH.
- the terminal 20A may transmit the PSCCH with the same time resource as at least a part of the time resource of the PSCH, using the frequency resource adjacent to the frequency resource of the PSCH.
- the terminal 20B receives the SCI (PSCCH and / or PSSCH) and SL data (PSSCH) transmitted from the terminal 20A.
- the received SCI may include information on PSFCH resources for the terminal 20B to transmit HARQ-ACK for receiving the data.
- the terminal 20A may include the information of the resource selected autonomously in the SCI and transmit it.
- step S104 the terminal 20B transmits HARQ-ACK for the received data to the terminal 20A by using the resource of PSFCH determined from the received SCI.
- step S105 the terminal 20A retransmits the PSCCH and the PSCH to the terminal 20B when the HARQ-ACK received in step S104 indicates that the retransmission is requested, that is, when it is NACK (negative response).
- Terminal 20A may resend PSCCH and PSCH using autonomously selected resources.
- steps S104 and S105 may not be executed.
- FIG. 11 is a sequence diagram showing an operation example (2) of V2X. Blind retransmissions without HARQ control may be performed to improve transmission success rate or reach.
- step S201 the terminal 20A autonomously selects the resources to be used for PSCCH and PSCH from the resource selection window having a predetermined period.
- the resource selection window may be set from the base station 10 to the terminal 20.
- step S202 and step S203 the terminal 20A transmits SCI by PSCCH and / or PSCH by using the resource autonomously selected in step S201, and transmits SL data by PSCH.
- the terminal 20A may transmit the PSCCH with the same time resource as at least a part of the time resource of the PSCH, using the frequency resource adjacent to the frequency resource of the PSCH.
- step S204 the terminal 20A retransmits the SCI by PSCCH and / or the SL data by PSCH to the terminal 20B by using the resource autonomously selected in step S201.
- the retransmission in step S204 may be executed a plurality of times.
- step S204 may not be executed.
- FIG. 12 is a sequence diagram showing an operation example (3) of V2X.
- the base station 10 may schedule the side link. That is, the base station 10 may determine the resource of the side link used by the terminal 20 and transmit the information indicating the resource to the terminal 20. Further, when HARQ control with HARQ feedback is applied, base station 10 may transmit information indicating PSFCH resources to terminal 20.
- step S301 the base station 10 performs SL scheduling by sending DCI (Downlink Control Information) to the terminal 20A by PDCCH.
- DCI Downlink Control Information
- the DCI for SL scheduling will be referred to as SL scheduling DCI.
- step S301 it is assumed that the base station 10 also transmits DCI for DL scheduling (which may be called DL allocation) to the terminal 20A by PDCCH.
- DCI for DL scheduling (which may be called DL allocation)
- the DCI for DL scheduling will be referred to as DL scheduling DCI.
- the terminal 20A that has received the DL scheduling DCI receives the DL data by PDSCH using the resource specified by the DL scheduling DCI.
- step S302 and step S303 the terminal 20A transmits SCI (Sidelink Control Information) by PSCCH and / or PSCH by using the resource specified by SL scheduling DCI, and also transmits SL data by PSCH.
- SCI Servicelink Control Information
- SL scheduling DCI only PSCH resources may be specified.
- the terminal 20A may transmit the PSCCH with the same time resource as at least a part of the time resource of the PSCH, using the frequency resource adjacent to the frequency resource of the PSCH.
- the terminal 20B receives the SCI (PSCCH and / or PSSCH) and SL data (PSSCH) transmitted from the terminal 20A.
- the SCI received by the PSCCH and / or the PSCH includes information on the resources of the PSFCH for the terminal 20B to transmit HARQ-ACK for receiving the data.
- the resource information is included in the DL scheduling DCI or SL scheduling DCI transmitted from the base station 10 in step S301, and the terminal 20A acquires the resource information from the DL scheduling DCI or SL scheduling DCI and SCI. Include in. Alternatively, the DCI transmitted from the base station 10 may not include the information of the resource, and the terminal 20A may autonomously include the information of the resource in the SCI and transmit the information.
- step S304 the terminal 20B transmits HARQ-ACK for the received data to the terminal 20A by using the resource of PSFCH determined from the received SCI.
- the terminal 20A has the PUCCH (or the SL scheduling DCI) designated by the DL scheduling DCI (or the SL scheduling DCI) at the timing specified by the DL scheduling DCI (or SL scheduling DCI) (for example, slot unit timing).
- the HARQ-ACK is transmitted using the resource, and the base station 10 receives the HARQ-ACK.
- the HARQ-ACK codebook may include HARQ-ACK generated based on HARQ-ACK received from the terminal 20B or PSFCH not received, and HARQ-ACK for DL data. However, HARQ-ACK for DL data is not included when DL data is not assigned. NR Rel. In 16, the HARQ-ACK codebook does not include HARQ-ACK for DL data.
- step S304 and / or step S305 may not be executed.
- FIG. 13 is a sequence diagram showing an operation example (4) of V2X.
- PSFCH Physical Uplink Control Channel
- the PSFCH format for example, the same format as PUCCH (Physical Uplink Control Channel) format 0 can be used. That is, the PSFCH format may have a PRB (Physical Resource Block) size of 1, and ACK and NACK may be sequence-based formats identified by sequence and / or cyclic shift differences.
- the format of PSFCH is not limited to this.
- the resources of PSFCH may be arranged in the symbol at the end of the slot or the plurality of symbols at the end. Further, whether or not the period N is set in the PSFCH resource is specified in advance. The period N may be set or predetermined in slot units.
- the vertical axis corresponds to the frequency domain and the horizontal axis corresponds to the time domain.
- the PSCCH may be arranged in one symbol at the beginning of the slot, may be arranged in a plurality of symbols from the beginning, or may be arranged in a plurality of symbols from a symbol other than the beginning.
- the PSFCH may be arranged in one symbol at the end of the slot, or may be arranged in a plurality of symbols at the end of the slot. In the above-mentioned "slot start" and "slot end", consideration of the symbol for AGC (Automatic Gain Control) and the symbol for transmission / reception switching may be omitted.
- the beginning of the slot and “the end of the slot” mean that the 12 symbols excluding the beginning and ending symbols are the beginning and ending symbols, respectively. You may.
- three subchannels are set in the resource pool, and two PSFCHs are arranged three slots after the slot in which the PSSCH is arranged.
- the arrow from PSSCH to PSFCH shows an example of PSFCH associated with PSSCH.
- step S401 the terminal 20A, which is the transmitting side terminal 20, executes a group cast to the terminal 20B, the terminal 20C, and the terminal 20D, which are the receiving side terminals 20, via SL-SCH.
- terminal 20B uses PSFCH # B
- terminal 20C uses PSFCH # C
- terminal 20D uses PSFCH # D to transmit a HARQ response to terminal 20A.
- the transmitting side terminal 20 may know the number of receiving side terminals 20 in the group cast. In group cast option 1, only NACK is transmitted as a HARQ response, and ACK is not transmitted.
- FIG. 14 is a diagram showing an example of sensing operation in NR.
- the terminal 20 selects a resource and transmits the resource.
- the terminal 20 performs sensing in a sensing window in the resource pool.
- the terminal 20 receives a resource reservation field or a resource allocation field included in the SCI transmitted from another terminal 20, and selects a resource in the resource pool based on the field. Identify available resource candidates in the window (resource selection window). Subsequently, the terminal 20 randomly selects a resource from the available resource candidates.
- the resource pool setting may have a period.
- the period may be a period of 10240 milliseconds.
- FIG. 14 shows an example in which slots t 0 SL to slot t Tmax SL are set as resource pools.
- the area of the resource pool in each cycle may be set by, for example, a bitmap.
- the transmission trigger in the terminal 20 is generated in the slot n and the priority of the transmission is pTX .
- the terminal 20 can detect, for example, that another terminal 20 is transmitting the priority pRX in the sensing window from the slot n-T 0 to the slot immediately before the slot n-T proc, 0 . ..
- RSRP Reference Signal Received Power
- the threshold value may be, for example, the threshold values Th pTX, pRX set or defined for each resource in the sensing window based on the priority pTX and the priority pRX .
- resources in the resource selection window that are candidates for resource reservation information corresponding to resources in the sensing window that have not been monitored for transmission are excluded.
- a resource occupied by another UE is identified, and a resource from which the resource is excluded becomes a usable resource candidate.
- the set of available resource candidates is SA
- the thresholds Th pTX and pRX set for each resource in the sensing window are increased by 3 dB and the resource is again increased.
- Identification may be performed. That is, by increasing the threshold values Th pTX and pRX and executing resource identification again, the resources that are not excluded because RSRP is less than the threshold value are increased, and the set SA of resource candidates becomes 20% or more of the resource selection window. It may be.
- the operation of increasing the threshold values Th pTX and pRX set for each resource in the sensing window by 3 dB and executing resource identification again may be repeated.
- the lower layer of the terminal 20 may report SA to the upper layer.
- the upper layer of the terminal 20 may perform a random selection on the SA to determine the resources to use.
- the terminal 20 may execute the side link transmission using the determined resource.
- the receiving side terminal 20 detects data transmission from the other terminal 20 based on the result of sensing or partial sensing, and the other terminal Data may be received from 20.
- FIG. 15 is a flowchart showing an example of preemption in NR.
- FIG. 16 is a diagram showing an example of preemption in NR.
- the terminal 20 executes sensing in the sensing window. When the terminal 20 performs a power saving operation, sensing may be executed for a limited period specified in advance. Subsequently, the terminal 20 identifies each resource in the resource selection window based on the sensing result, determines a set SA of resource candidates, and selects a resource to be used for transmission (S502). Subsequently, the terminal 20 selects a resource set (r_0, r_1, ...) For determining preemption from the set of resource candidates SA (S503). The resource set may be notified from the upper layer to the PHY layer as a resource for determining whether or not it is preempted.
- step S504 the terminal 20 re-identifies each resource in the resource selection window based on the sensing result at the timing of T (r_0) -T 3 shown in FIG. 16 to determine the set SA of resource candidates. Further, the preemption is determined for the resource set (r_0, r_1, ...) Based on the priority. For example, in r_1 shown in FIG. 16, SCI transmitted from another terminal 20 is detected by resensing , and is not included in SA. When preemption is enabled, if the value prio_RX indicating the priority of SCI transmitted from the other terminal 20 is lower than the value prio_TX indicating the priority of the transport block transmitted from the own terminal, the terminal 20 uses the resource r_1.
- the terminal 20 determines that the resource r_1 has been preempted.
- step S505 when the preemption is determined in step S504, the terminal 20 notifies the upper layer of the preemption, reselects the resource in the upper layer, and ends the preemption check.
- the resource set (r_0, r_1, ...) Is set in SA after the set SA of resource candidates is determined in step S504. If the resource of is not included, the resource is not used and the resource is reselected in the upper layer.
- the random resource selection and partial sensing of the side link in LTE release 14 may be applied to the resource allocation mode 2 of the NR release 16 side link.
- the terminal 20 to which the partial sensing is applied performs reception and sensing only in a specific slot in the sensing window.
- eURLLC enhanced Ultra Reliable Low Latency Communication
- the terminal 20A may share information indicating a resource set with the terminal 20B, and the terminal 20B may consider the information in resource selection for transmission.
- the terminal 20 may execute full sensing as shown in FIG. Further, the terminal 20 may execute resource identification by sensing only limited resources as compared with full sensing, and execute partial sensing that selects resources from the identified resource set. Further, the terminal 20 does not exclude the resource from the resource in the resource selection window, sets the resource in the resource selection window as the identified resource set, and executes random selection to select the resource from the identified resource set. You may.
- the operation may be specified assuming two types of terminals 20.
- One is type A, the type A terminal 20 is not capable of receiving any sidelink signals and channels. However, the exception may be to receive PSFCH and S-SSB.
- the other is type D, where the type D terminal 20 has the ability to receive all sidelink signals and channels defined in release 16. However, the terminal 20 that receives some side link signals and channels is not excluded.
- DRX discontinuous reception
- the terminal 20 in which the DRX is set performs the reception operation only in a predetermined time interval.
- the terminal 20 in which the DRX operation is set may perform an operation related to a predetermined resource allocation.
- FIG. 17 is a flowchart for explaining an example of communication according to the embodiment of the present invention.
- step S601 DRX is set in the terminal 20.
- step S602 the terminal 20 executes the operation related to resource allocation based on the state related to DRX.
- the terminal 20 may exclude the slot corresponding to the DRX sleep period from the resource selection target.
- the slot corresponding to the DRX sleep period may be a slot that can be indicated by a resource reservation cycle field and / or a time resource allocation field from the slot in the DRX sleep period in addition to the slot in the DRX sleep period. It may be a slot that can be indicated by the SCI received in the slot during the sleep period.
- the terminal 20 may exclude the slot corresponding to the DRX sleep period from the sensing target. Further, the terminal 20 may exclude the slot corresponding to the DRX sleep period at the time of resource identification. Further, when selecting a resource from the identified resource set, the terminal 20 may exclude the slot corresponding to the DRX sleep period from the selection target, or may lower the selection priority. The sensing can be operated while not deteriorating the power saving effect of the DRX.
- sensing may be executed in the slot within the DRX sleep period. For example, in a slot within the DRX sleep period, the terminal 20 may only perform SCI reception or PSCCH reception. In the slot within the DRX sleep period, the terminal 20 may not perform SL-SCH reception or PSSCH reception. Sensing can be operated regardless of the DRX sleep period.
- the terminal 20 may exclude the resource of the PSCCH / PSCH from the resource selection target. Further, the terminal 20 may exclude the PSCCH / PSSCH resource from the sensing target. Further, the terminal 20 may exclude the PSCCH / PSSCH resource at the time of resource identification. Further, when selecting a resource from the identified resource set, the terminal 20 may exclude the resource of the PSCCH / PSSCH from the selection target, or may lower the selection priority.
- the operation of excluding the above PSCCH / PSCH resource may be limited only when SL-HARQ feedback is valid for SL transmission in the PSCCH / PSCH resource, and SL-HARQ feedback is invalid. In some cases, the above action of excluding the PSCCH / PSCH resource may not be applied. Resources can be selected so that there is no need for PSFCH reception during the DRX sleep period.
- the terminal 20 sets the PSFCH opportunity corresponding to the resource of the PSCCH / PSCH to a timing other than the DRX sleep period, for example, a PSFCH opportunity after the DRX sleep period. You may change it.
- the terminal 20 may be changed to a PSFCH opportunity immediately after the DRX sleep period.
- the method for determining the frequency and / or code resource in the PSFCH opportunity may be the same as before the PSFCH change, or may be different. For example, a frequency and / or code resource different from that before the change of PSFCH opportunity may be set.
- notification regarding the change of PSFCH opportunity may be given.
- Terminal 20 may transmit a notification relating to a change in PSFCH opportunity via SCI.
- the number of PSFCH opportunities from the original PSFCH opportunity to the changed PSFCH opportunity may be notified. Resources can be selected regardless of the DRX sleep period, while avoiding the need for PSFCH reception during the DRX sleep period.
- the resource of the PSCCH / PSCH may be the target of resource selection. If the DRX sleep opportunity includes a PSFCH opportunity corresponding to the selected resource, the DRX-configured terminal 20 may receive the PSFCH. Regardless of the DRX sleep period, you can select resources for transmission for which HARQ feedback is valid.
- the terminal 20 in which the DRX operation is set may select a resource by a predetermined method when executing resource selection from the identified resource set. For example, the terminal 20 may preferentially select the earliest time resource. For example, resources may be selected based on the DRX sleep period, for example, the terminal 20 may preferentially select resources prior to the DRX sleep period.
- the resource allocation operation may be either full sensing, partial sensing, or random selection.
- the above-described embodiment may be applied to an operation in which a certain terminal 20 sets or allocates transmission resources of another terminal 20. That is, resource setting or allocation may be performed so that the above embodiment is satisfied.
- the above embodiment is not limited to V2X terminals, and may be applied to terminals that perform D2D communication.
- the operation according to the above embodiment may be executed only in a specific resource pool.
- it may be executed only in the resource pool that can be used by the terminal 20 after release 17.
- the terminal 20 can autonomously select a resource according to the state of DRX operation without impairing the power saving effect.
- DRX discontinuous reception
- the base station 10 and the terminal 20 include a function of carrying out the above-described embodiment.
- the base station 10 and the terminal 20 may each have only a part of the functions in the embodiment.
- FIG. 18 is a diagram showing an example of the functional configuration of the base station 10.
- the base station 10 includes a transmission unit 110, a reception unit 120, a setting unit 130, and a control unit 140.
- the functional configuration shown in FIG. 18 is only an example. Any function classification and name of the functional unit may be used as long as the operation according to the embodiment of the present invention can be executed.
- the transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly.
- the receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring information of, for example, a higher layer from the received signals. Further, the transmission unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signal, DL reference signal and the like to the terminal 20.
- the setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in the storage device, and reads the setting information from the storage device as needed.
- the content of the setting information is, for example, information related to the setting of D2D communication.
- the control unit 140 performs processing related to the setting for the terminal 20 to perform D2D communication. Further, the control unit 140 transmits the scheduling of D2D communication and DL communication to the terminal 20 via the transmission unit 110. Further, the control unit 140 receives information related to the HARQ response of the D2D communication and the DL communication from the terminal 20 via the reception unit 120.
- the function unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and the function unit related to signal reception in the control unit 140 may be included in the reception unit 120.
- FIG. 19 is a diagram showing an example of the functional configuration of the terminal 20.
- the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240.
- the functional configuration shown in FIG. 19 is only an example. Any function classification and name of the functional unit may be used as long as the operation according to the embodiment of the present invention can be executed.
- the transmission unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal.
- the receiving unit 220 wirelessly receives various signals and acquires a signal of a higher layer from the received signal of the physical layer. Further, the receiving unit 220 has a function of receiving the NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signal, reference signal, etc. transmitted from the base station 10. Further, for example, the transmission unit 210 connects the other terminal 20 to PSCCH (Physical Sidelink Control Channel), PSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel) as D2D communication. Etc., and the receiving unit 220 receives PSCCH, PSCH, PSDCH, PSBCH, etc. from the other terminal 20.
- PSCCH Physical Sidelink Control Channel
- PSCH Physical Sidelink Shared Channel
- PSDCH Physical Sidelink Discovery Channel
- PSBCH Physical Side
- the setting unit 230 stores various setting information received from the base station 10 or the terminal 20 by the receiving unit 220 in the storage device, and reads it out from the storage device as needed.
- the setting unit 230 also stores preset setting information.
- the content of the setting information is, for example, information related to the setting of D2D communication.
- the control unit 240 controls D2D communication for establishing an RRC connection with another terminal 20 as described in the embodiment. In addition, the control unit 240 performs processing related to power saving operation. In addition, the control unit 240 performs processing related to HARQ of D2D communication and DL communication. Further, the control unit 240 transmits information related to the HARQ response of the D2D communication and the DL communication from the base station 10 to the other terminal 20 scheduled to the base station 10. Further, the control unit 240 may schedule D2D communication to another terminal 20. Further, the control unit 240 may autonomously select a resource to be used for D2D communication from the resource selection window based on the sensing result, or may execute re-evaluation or preemption.
- control unit 240 performs processing related to power saving in transmission / reception of D2D communication. In addition, the control unit 240 performs processing related to inter-terminal cooperation in D2D communication.
- the function unit related to signal transmission in the control unit 240 may be included in the transmission unit 210, and the function unit related to signal reception in the control unit 240 may be included in the reception unit 220.
- each functional block may be realized by using one device that is physically or logically connected, or directly or indirectly (for example, by two or more devices that are physically or logically separated). , Wired, wireless, etc.) and may be realized using these plurality of devices.
- the functional block may be realized by combining the software with the one device or the plurality of devices.
- Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption. Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but limited to these I can't.
- a functional block (component) that functions transmission is called a transmitting unit or a transmitter.
- the method of realizing each of them is not particularly limited.
- the base station 10, the terminal 20, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure.
- FIG. 20 is a diagram showing an example of the hardware configuration of the base station 10 and the terminal 20 according to the embodiment of the present disclosure.
- the above-mentioned base station 10 and terminal 20 are physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. May be good.
- the word “device” can be read as a circuit, device, unit, etc.
- the hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.
- the processor 1001 For each function of the base station 10 and the terminal 20, the processor 1001 performs an operation by loading predetermined software (program) on the hardware such as the processor 1001 and the storage device 1002, and controls the communication by the communication device 1004. It is realized by controlling at least one of reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.
- Processor 1001 operates, for example, an operating system to control the entire computer.
- the processor 1001 may be composed of a central processing unit (CPU: Central Processing Unit) including an interface with peripheral devices, a control device, an arithmetic unit, a register, and the like.
- CPU Central Processing Unit
- the control unit 140, the control unit 240, and the like described above may be realized by the processor 1001.
- the processor 1001 reads a program (program code), a software module, data, or the like from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes according to these.
- a program program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used.
- the control unit 140 of the base station 10 shown in FIG. 18 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001.
- the control unit 240 of the terminal 20 shown in FIG. 19 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001.
- Processor 1001 may be implemented by one or more chips.
- the program may be transmitted from the network via a telecommunication line.
- the storage device 1002 is a computer-readable recording medium, for example, by at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and the like. It may be configured.
- the storage device 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like.
- the storage device 1002 can store a program (program code), a software module, or the like that can be executed to implement the communication method according to the embodiment of the present disclosure.
- the auxiliary storage device 1003 is a computer-readable recording medium, and is, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, Blu).
- -It may be composed of at least one of a ray (registered trademark) disk), a smart card, a flash memory (for example, a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like.
- the storage medium described above may be, for example, a database, server or other suitable medium containing at least one of the storage device 1002 and the auxiliary storage device 1003.
- the communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to realize at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). It may be composed of.
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- the transmission / reception unit may be physically or logically separated from each other in the transmission unit and the reception unit.
- the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside.
- the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
- each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.
- the base station 10 and the terminal 20 are hardware such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). It may be configured to include, and a part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these hardware.
- DSP Digital Signal Processor
- ASIC Application Specific Integrated Circuit
- PLD Programmable Logic Device
- FPGA Field Programmable Gate Array
- the receiving unit that receives control information from another terminal and the operation related to DRX (Discontinuous reception) are controlled, and the resource pool is used.
- a terminal having a control unit that autonomously selects a resource based on the control information and a state related to DRX, and a transmission unit that transmits to another terminal using the selected resource.
- the terminal 20 can autonomously select a resource according to the state of DRX operation without impairing the power saving effect. That is, in the direct communication between terminals, the DRX (Discontinuous reception) operation and the communication at the time of autonomous resource selection can be matched.
- the control unit may exclude the resources of the resource pool during the DRX sleep period from the selection target.
- the terminal 20 can autonomously select a resource according to the state of DRX operation without impairing the power saving effect.
- the control unit may exclude resources including a corresponding HARQ (Hybrid automatic repeat request) feedback channel from the selection target within the DRX sleep period.
- HARQ Hybrid automatic repeat request
- the control unit may preferentially select the resource with the earliest time among the resources that can be selected in the resource pool.
- the terminal 20 can autonomously select a resource according to the state of DRX operation without impairing the power saving effect.
- the control unit may change the reception opportunity of the HARQ feedback channel to a timing other than the DRX sleep period when the reception opportunity of the HARQ feedback channel corresponding to the resource used for transmission is included in the DRX sleep period. ..
- the terminal 20 can autonomously select a resource without impairing the power saving effect by changing the PFFCH reception timing according to the state of DRX operation.
- the reception procedure for receiving control information from another terminal and the operation related to DRX are controlled, and the control information and DRX are controlled in the resource pool.
- a communication method in which a terminal executes a control procedure for autonomously selecting a resource based on the state according to the above and a transmission procedure for transmitting the selected resource to another terminal.
- the terminal 20 can autonomously select a resource according to the state of DRX operation without impairing the power saving effect. That is, in the direct communication between terminals, the DRX (Discontinuous reception) operation and the communication at the time of autonomous resource selection can be matched.
- the operation of the plurality of functional units may be physically performed by one component, or the operation of one functional unit may be physically performed by a plurality of components.
- the processing order may be changed as long as there is no contradiction.
- the base station 10 and the terminal 20 have been described with reference to functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof.
- the software operated by the processor of the base station 10 according to the embodiment of the present invention and the software operated by the processor of the terminal 20 according to the embodiment of the present invention are random access memory (RAM), flash memory, and read-only memory, respectively. It may be stored in (ROM), EPROM, EPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.
- information notification includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, etc. Broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof may be used.
- RRC signaling may be referred to as an RRC message, for example, RRC. It may be a connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.
- Each aspect / embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), and 5G (5th generation mobile communication).
- system FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)) )), LTE 802.16 (WiMAX®), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth®, and other systems that utilize suitable systems and have been extended based on these. It may be applied to at least one of the next generation systems. Further, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).
- the specific operation performed by the base station 10 in the present specification may be performed by its upper node.
- various operations performed for communication with the terminal 20 are performed by the base station 10 and other network nodes other than the base station 10 (for example, it is clear that it can be done by at least one of (but not limited to, MME, S-GW, etc.).
- the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW). ..
- the information, signals, etc. described in the present disclosure can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.
- the input / output information and the like may be stored in a specific location (for example, memory) or may be managed using a management table. Input / output information and the like can be overwritten, updated, or added. The output information and the like may be deleted. The input information or the like may be transmitted to another device.
- the determination in the present disclosure may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparing numerical values (for example,). , Comparison with a predetermined value).
- Software whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module.
- Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- a transmission medium For example, a website where the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.).
- wired technology coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.
- wireless technology infrared, microwave, etc.
- the information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.
- a channel and a symbol may be a signal (signaling).
- the signal may be a message.
- the component carrier CC: Component Carrier
- CC Component Carrier
- system and “network” used in this disclosure are used interchangeably.
- the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented.
- the radio resource may be one indicated by an index.
- base station Base Station
- wireless base station base station
- base station fixed station
- NodeB nodeB
- eNodeB eNodeB
- gNodeB gNodeB
- access point “ transmission point ”,“ reception point ”,“ transmission / reception point ”,“ cell ”,“ sector ”,“ Terms such as “cell group”, “carrier”, and “component carrier” can be used interchangeably.
- Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.
- the base station can accommodate one or more (for example, three) cells.
- a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (RRH:)).
- Communication services can also be provided by Remote Radio Head).
- the term "cell” or “sector” refers to part or all of the coverage area of at least one of the base stations and base station subsystems that provide communication services in this coverage. Point to.
- MS Mobile Station
- UE User Equipment
- Mobile stations can be used by those skilled in the art as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like.
- the moving body may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving body (for example, a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned type). ) May be.
- at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation.
- at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be read by the user terminal.
- the communication between the base station and the user terminal is replaced with the communication between a plurality of terminals 20 (for example, it may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.).
- D2D Device-to-Device
- V2X Vehicle-to-Everything
- Each aspect / embodiment of the present disclosure may be applied to the configuration.
- the terminal 20 may have the function of the base station 10 described above.
- words such as "up” and “down” may be read as words corresponding to communication between terminals (for example, "side”).
- the upstream channel, the downstream channel, and the like may be read as a side channel.
- the user terminal in the present disclosure may be read as a base station.
- the base station may have the functions of the user terminal described above.
- determining and “determining” used in this disclosure may include a wide variety of actions.
- “Judgment” and “decision” are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry). (For example, searching in a table, database or another data structure), ascertaining may be regarded as “judgment” or “decision”.
- judgment and “decision” are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access.
- Accessing (for example, accessing data in memory) may be regarded as "judgment” or “decision”.
- judgment and “decision” mean that the things such as solving, selecting, choosing, establishing, and comparing are regarded as “judgment” and “decision”. Can include. That is, “judgment” and “decision” may include considering some action as “judgment” and “decision”. Further, “judgment (decision)” may be read as “assuming”, “expecting”, “considering” and the like.
- connection means any direct or indirect connection or connection between two or more elements, and each other. It can include the presence of one or more intermediate elements between two “connected” or “combined” elements.
- the connections or connections between the elements may be physical, logical, or a combination thereof.
- connection may be read as "access”.
- the two elements use at least one of one or more wires, cables and printed electrical connections, and, as some non-limiting and non-comprehensive examples, the radio frequency domain. Can be considered to be “connected” or “coupled” to each other using electromagnetic energy having wavelengths in the microwave and light (both visible and invisible) regions.
- the reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot (Pilot) depending on the applicable standard.
- RS Reference Signal
- Pilot Pilot
- references to elements using designations such as “first” and “second” as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted, or that the first element must somehow precede the second element.
- each of the above devices may be replaced with a "part”, a “circuit”, a “device”, or the like.
- the wireless frame may be composed of one or more frames in the time domain. Each one or more frames in the time domain may be referred to as a subframe. Subframes may further consist of one or more slots in the time domain.
- the subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.
- the numerology may be a communication parameter that applies to at least one of the transmission and reception of a signal or channel.
- Numerology includes, for example, subcarrier interval (SCS: SubCarrier Spacing), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI: Transmission Time Interval), number of symbols per TTI, wireless frame configuration, transmitter / receiver.
- SCS SubCarrier Spacing
- TTI Transmission Time Interval
- At least one of a specific filtering process performed in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like may be indicated.
- the slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time region. Slots may be time units based on new melody.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain.
- the mini-slot may also be referred to as a sub-slot.
- a minislot may consist of a smaller number of symbols than the slot.
- a PDSCH (or PUSCH) transmitted in a time unit larger than the minislot may be referred to as a PDSCH (or PUSCH) mapping type A.
- the PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (or PUSCH) mapping type B.
- the wireless frame, subframe, slot, minislot and symbol all represent the time unit when transmitting a signal.
- the radio frame, subframe, slot, minislot and symbol may have different names corresponding to each.
- one subframe may be called a transmission time interval (TTI), a plurality of consecutive subframes may be called TTI, and one slot or one minislot may be called TTI.
- TTI transmission time interval
- the unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.
- TTI refers to, for example, the minimum time unit of scheduling in wireless communication.
- the base station schedules each terminal 20 to allocate radio resources (frequency bandwidth that can be used in each terminal 20, transmission power, etc.) in TTI units.
- the definition of TTI is not limited to this.
- the TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation.
- the time interval for example, the number of symbols
- the transport block, code block, code word, etc. may be shorter than the TTI.
- one or more TTIs may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
- a TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like.
- TTIs shorter than normal TTIs may be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots, and the like.
- the long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (for example, shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.
- the resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain.
- the number of subcarriers contained in the RB may be the same regardless of the numerology, and may be, for example, 12.
- the number of subcarriers contained in the RB may be determined based on numerology.
- the time domain of RB may include one or more symbols, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI.
- Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.
- One or more RBs include a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, and the like. May be called.
- PRB Physical resource block
- SCG Sub-Carrier Group
- REG Resource Element Group
- PRB pair an RB pair, and the like. May be called.
- the resource block may be composed of one or a plurality of resource elements (RE: Resource Element).
- RE Resource Element
- 1RE may be a radio resource area of 1 subcarrier and 1 symbol.
- Bandwidth part (which may also be called partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a certain neurology in a carrier.
- the common RB may be specified by the index of the RB with respect to the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- the BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP).
- UL BWP UL BWP
- DL BWP DL BWP
- One or more BWPs may be set in one carrier for the terminal 20.
- At least one of the configured BWPs may be active, and the terminal 20 does not have to assume that a predetermined signal / channel is transmitted or received outside the active BWP.
- “cell”, “carrier” and the like in this disclosure may be read as “BWP”.
- the above-mentioned structures such as wireless frames, subframes, slots, mini slots and symbols are merely examples.
- the number of subframes contained in a wireless frame the number of slots per subframe or wireless frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in the RB.
- the number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and the like can be changed in various ways.
- the term "A and B are different” may mean “A and B are different from each other”.
- the term may mean that "A and B are different from C”.
- Terms such as “separate” and “combined” may be interpreted in the same way as “different”.
- the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.
- SCI is an example of control information.
- Base station 110 Transmission unit 120 Reception unit 130 Setting unit 140 Control unit 20 Terminal 210 Transmission unit 220 Reception unit 230 Setting unit 240 Control unit 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device
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Abstract
Description
1)時間領域のリソース配置
2)周波数領域のリソース配置
3)参照する同期信号(SLSS(Sidelink Synchronization Signal)を含む)
4)送信電力制御のためのパスロス測定に用いる参照信号
次に、これまでに説明した処理及び動作を実行する基地局10及び端末20の機能構成例を説明する。基地局10及び端末20は上述した実施例を実施する機能を含む。ただし、基地局10及び端末20はそれぞれ、実施例の中の一部の機能のみを備えることとしてもよい。
図18は、基地局10の機能構成の一例を示す図である。図18に示されるように、基地局10は、送信部110と、受信部120と、設定部130と、制御部140とを有する。図18に示される機能構成は一例に過ぎない。本発明の実施の形態に係る動作を実行できるのであれば、機能区分及び機能部の名称はどのようなものでもよい。
図19は、端末20の機能構成の一例を示す図である。図19に示されるように、端末20は、送信部210と、受信部220と、設定部230と、制御部240とを有する。図19に示される機能構成は一例に過ぎない。本発明の実施の形態に係る動作を実行できるのであれば、機能区分及び機能部の名称はどのようなものでもよい。
上記実施形態の説明に用いたブロック図(図18及び図19)は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及びソフトウェアの少なくとも一方の任意の組み合わせによって実現される。また、各機能ブロックの実現方法は特に限定されない。すなわち、各機能ブロックは、物理的又は論理的に結合した1つの装置を用いて実現されてもよいし、物理的又は論理的に分離した2つ以上の装置を直接的又は間接的に(例えば、有線、無線などを用いて)接続し、これら複数の装置を用いて実現されてもよい。機能ブロックは、上記1つの装置又は上記複数の装置にソフトウェアを組み合わせて実現されてもよい。
以上、説明したように、本発明の実施の形態によれば、リソースプールにおいて、他の端末から制御情報を受信する受信部と、DRX(Discontinuous reception)に係る動作を制御し、前記リソースプールにおいて前記制御情報及びDRXに係る状態に基づいて自律的にリソースを選択する制御部と、前記選択されたリソースを使用して他の端末に送信する送信部とを有する端末が提供される。
以上、本発明の実施の形態を説明してきたが、開示される発明はそのような実施形態に限定されず、当業者は様々な変形例、修正例、代替例、置換例等を理解するであろう。発明の理解を促すため具体的な数値例を用いて説明がなされたが、特に断りのない限り、それらの数値は単なる一例に過ぎず適切な如何なる値が使用されてもよい。上記の説明における項目の区分けは本発明に本質的ではなく、2以上の項目に記載された事項が必要に応じて組み合わせて使用されてよいし、ある項目に記載された事項が、別の項目に記載された事項に(矛盾しない限り)適用されてよい。機能ブロック図における機能部又は処理部の境界は必ずしも物理的な部品の境界に対応するとは限らない。複数の機能部の動作が物理的には1つの部品で行われてもよいし、あるいは1つの機能部の動作が物理的には複数の部品により行われてもよい。実施の形態で述べた処理手順については、矛盾の無い限り処理の順序を入れ替えてもよい。処理説明の便宜上、基地局10及び端末20は機能的なブロック図を用いて説明されたが、そのような装置はハードウェアで、ソフトウェアで又はそれらの組み合わせで実現されてもよい。本発明の実施の形態に従って基地局10が有するプロセッサにより動作するソフトウェア及び本発明の実施の形態に従って端末20が有するプロセッサにより動作するソフトウェアはそれぞれ、ランダムアクセスメモリ(RAM)、フラッシュメモリ、読み取り専用メモリ(ROM)、EPROM、EEPROM、レジスタ、ハードディスク(HDD)、リムーバブルディスク、CD-ROM、データベース、サーバその他の適切な如何なる記憶媒体に保存されてもよい。
110 送信部
120 受信部
130 設定部
140 制御部
20 端末
210 送信部
220 受信部
230 設定部
240 制御部
1001 プロセッサ
1002 記憶装置
1003 補助記憶装置
1004 通信装置
1005 入力装置
1006 出力装置
Claims (6)
- リソースプールにおいて、他の端末から制御情報を受信する受信部と、
DRX(Discontinuous reception)に係る動作を制御し、前記リソースプールにおいて前記制御情報及びDRXに係る状態に基づいて自律的にリソースを選択する制御部と、
前記選択されたリソースを使用して他の端末に送信する送信部とを有する端末。 - 前記制御部は、DRXスリープ期間内の前記リソースプールのリソースを選択対象から除外する請求項1記載の端末。
- 前記制御部は、対応するHARQ(Hybrid automatic repeat request)フィードバックのチャネルがDRXスリープ期間内に含まれるリソースを選択対象から除外する請求項1記載の端末。
- 前記制御部は、DRXが設定されている場合、前記リソースプールにおいて選択可能なリソースのうち最も早い時間のリソースを優先的に選択する請求項1記載の端末。
- 前記制御部は、送信に使用するリソースに対応するHARQフィードバックのチャネルの受信機会がDRXスリープ期間内に含まれる場合、HARQフィードバックのチャネルの受信機会をDRXスリープ期間以外のタイミングに変更する請求項1記載の端末。
- リソースプールにおいて、他の端末から制御情報を受信する受信手順と、
DRX(Discontinuous reception)に係る動作を制御し、前記リソースプールにおいて前記制御情報及びDRXに係る状態に基づいて自律的にリソースを選択する制御手順と、
前記選択されたリソースを使用して他の端末に送信する送信手順とを端末が実行する通信方法。
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