WO2019084925A1 - Procédé de sélection de porteuse dans une communication d2d et dispositif terminal - Google Patents

Procédé de sélection de porteuse dans une communication d2d et dispositif terminal Download PDF

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Publication number
WO2019084925A1
WO2019084925A1 PCT/CN2017/109401 CN2017109401W WO2019084925A1 WO 2019084925 A1 WO2019084925 A1 WO 2019084925A1 CN 2017109401 W CN2017109401 W CN 2017109401W WO 2019084925 A1 WO2019084925 A1 WO 2019084925A1
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WIPO (PCT)
Prior art keywords
terminal device
carrier
cbr
multiple carriers
target
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PCT/CN2017/109401
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English (en)
Chinese (zh)
Inventor
唐海
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Oppo广东移动通信有限公司
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Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to CN201780091672.XA priority Critical patent/CN110741708B/zh
Priority to PCT/CN2017/109401 priority patent/WO2019084925A1/fr
Publication of WO2019084925A1 publication Critical patent/WO2019084925A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management

Definitions

  • the embodiments of the present application relate to the field of wireless communications, and in particular, to a method and a terminal device for selecting carriers in Device to Device (D2D) communication.
  • D2D Device to Device
  • Vehicle networking or Vehicle to Everything (V2X) communication system is a sidelink (SL) transmission technology based on Device to Device (D2D) communication, with traditional long-term evolution ( In the Long Term Evolution (LTE) system, the way in which the base station receives or transmits data is different.
  • the vehicle networking system adopts a terminal-to-terminal direct communication method, and thus has higher spectrum efficiency and lower transmission delay.
  • a terminal device may perform current data transmission using one or more of the candidate multiple carriers. Therefore, how to select a carrier by a terminal device or a base station becomes an urgent problem to be solved.
  • the embodiment of the present application provides a carrier selection method and a terminal device in D2D communication, and the terminal device can effectively perform carrier selection while satisfying a delay requirement.
  • a method for carrier selection in D2D communication comprising: acquiring, by a terminal device, a channel occupancy ratio CBR of a plurality of carriers in a subframe [nP, n-P+(T-1)], where T is The time delay of the target service to be transmitted, P is a positive integer, the subframe n is the time when the target service arrives, or the time at which the terminal device needs to perform carrier selection or resource selection; the terminal device according to the The CBR of the multiple carriers performs the carrier selection in the multiple carriers to obtain a target carrier for transmitting the target service.
  • the terminal device selects, according to the delay T of the target service to be transmitted, according to the channel occupancy ratio CBR of the multiple carriers in the subframe [nP, n-P+(T-1)].
  • the target carrier of the target service is transmitted, so that effective carrier selection can be realized under the condition that the delay requirement is met.
  • the P may be a period for performing carrier selection or resource selection.
  • the subframe n is the time at which the terminal device determines that carrier selection or resource selection is required, the n-P can recognize
  • P is, for example, 100 ms.
  • the terminal device performs the carrier selection in the multiple carriers according to the CBR of the multiple carriers, where the terminal device separately performs CBR on the multiple carriers. Performing a filtering process to obtain a filtered CBR of the plurality of carriers; and selecting the target carrier among the plurality of carriers according to the filtered CBR of the multiple carriers.
  • the performing filtering processing on the CBRs of the multiple carriers separately includes: performing smoothing filtering on CBRs of the multiple carriers, respectively.
  • the CBR_new is the CBR of each carrier after the filtering
  • the CBR_current is the CBR of each carrier before the filtering
  • the CBR_old is the CBR of each carrier after the last filtering
  • a is a filter coefficient and 0 ⁇ a ⁇ 1.
  • the terminal device performs the carrier selection in the multiple carriers according to the CBR of the multiple carriers, including: the terminal device according to the CBR of the multiple carriers, A carrier having a smallest CBR is selected as the target carrier among the plurality of carriers.
  • a method for carrier selection in D2D communication which includes: a physical layer of a terminal device performs resource sensing on multiple carriers in a time interval [n+T1, n+T2], where n is to be transmitted.
  • the physical layer of the terminal device determines the multiple according to the result of the resource interception a set of available resources on the carrier that can be used to transmit the target service, and a plurality of physical side-link shared channel reference signal received power PSSCH-RSRP thresholds corresponding to the multiple carriers, wherein available resources on each carrier
  • the PSSCH-RSRP of the resource in the set is less than or equal to the PSSCH-RSRP threshold corresponding to each carrier; the terminal device performs the carrier selection according to multiple PSSCH-RSRP thresholds corresponding to the multiple carriers to obtain A target carrier for transmitting the target service.
  • the terminal device may obtain multiple PSSCH-RSRP thresholds corresponding to the multiple carriers in the process of determining the available resource set on the multiple carriers, and according to the multiple corresponding to the multiple carriers,
  • the PSSCH-RSRP threshold effectively implements carrier selection, so that a terminal device in a system supporting multi-carrier transmission can acquire resources in the selected carrier for data transmission.
  • the terminal device determines, according to the multiple PSSCH-RSRP thresholds corresponding to the multiple carriers, a target carrier for transmitting the target service, where: the physical layer of the terminal device is based on And a plurality of PSSCH-RSRP thresholds corresponding to the multiple carriers, and selecting, as the target carrier, a carrier with a minimum PSSCH-RSRP threshold among the multiple carriers.
  • the method further includes: the physical layer of the terminal device reports the available resource set on the target carrier to a higher layer of the terminal device, and/or the terminal device The physical layer reports the index of the target carrier to the upper layer of the terminal device; the upper layer of the terminal device selects a resource for transmitting the target service in the available resource set on the target carrier.
  • the terminal device determines, according to multiple PSSCH-RSRP thresholds corresponding to the multiple carriers, a target carrier for transmitting the target service, including: physical layer orientation of the terminal device
  • the higher layer of the terminal device reports multiple PSSCH-RSRP thresholds corresponding to the multiple carriers; the higher layer of the terminal device selects among the multiple carriers according to multiple PSSCH-RSRP thresholds corresponding to the multiple carriers
  • the carrier with the smallest PSSCH-RSRP threshold is used as the target carrier.
  • the method further includes: reporting, by a physical layer of the terminal device, a set of available resources on the multiple carriers to a higher layer of the terminal device; Among the available resource sets on the target carrier, resources for transmitting the target service are selected.
  • T2 is less than or equal to the delay of the target service.
  • a terminal device which can perform the operations of the terminal device in the above first aspect or any optional implementation manner of the first aspect.
  • the terminal device may comprise a modular unit for performing the operations of the terminal device in any of the possible implementations of the first aspect or the first aspect described above.
  • a fourth aspect provides a terminal device, which can perform the operations of the terminal device in any of the foregoing optional implementations of the second aspect or the second aspect.
  • the terminal device may comprise a modular unit for performing the operations of the terminal device in any of the possible implementations of the second aspect or the second aspect described above.
  • a terminal device comprising: a processor, a transceiver, and a memory.
  • the processor, the transceiver, and the memory communicate with each other through an internal connection path.
  • the memory is for storing instructions for executing instructions stored by the memory. When the process When the instruction is executed by the memory, the execution causes the terminal device to perform the method of the first aspect or any possible implementation of the first aspect, or the execution causes the terminal device to implement the terminal device provided by the third aspect.
  • a terminal device comprising: a processor, a transceiver, and a memory.
  • the processor, the transceiver, and the memory communicate with each other through an internal connection path.
  • the memory is for storing instructions for executing instructions stored by the memory.
  • the processor executes the instruction stored by the memory, the executing causes the terminal device to perform the method in any of the possible implementations of the second aspect or the second aspect, or the execution causes the terminal device to implement the terminal provided by the fourth aspect device.
  • a computer readable storage medium storing a program causing a terminal device to perform the first aspect described above, and any one of the various implementations of the D2D communication Medium carrier selection method.
  • a computer readable storage medium storing a program causing the terminal device to perform the second aspect described above, and any one of the various implementations of the D2D communication Medium carrier selection method.
  • a system chip comprising an input interface, an output interface, a processor, and a memory
  • the processor is configured to execute an instruction stored by the memory, and when the instruction is executed, the processor can implement the foregoing The method of any of the first aspect or any of the possible implementations of the first aspect.
  • a system chip includes an input interface, an output interface, a processor, and a memory
  • the processor is configured to execute an instruction stored by the memory, and when the instruction is executed, the processor can implement the foregoing The method of any of the second aspect or any possible implementation of the second aspect.
  • a computer program product comprising instructions for causing a computer to execute the method of any of the first aspect or the first aspect of the first aspect, when the computer program product is run on a computer.
  • a computer program product comprising instructions which, when executed on a computer, cause the computer to perform the method of any of the second aspect or the second aspect of the second aspect.
  • FIG. 1 is a schematic structural diagram of an application scenario of an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of another application scenario of the embodiment of the present application.
  • Figure 3 is a schematic diagram of resource listening and selection.
  • FIG. 4 is a schematic flowchart of a method for carrier selection according to an embodiment of the present application.
  • FIG. 5 is a schematic flowchart of a method for carrier selection according to another embodiment of the present application.
  • FIG. 6 is a schematic block diagram of a terminal device according to an embodiment of the present application.
  • FIG. 7 is a schematic block diagram of a terminal device according to another embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a communication device according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a system chip according to an embodiment of the present application.
  • GSM Global System of Mobile Communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • the present application describes various embodiments in connection with a terminal device.
  • the terminal device may also refer to a user equipment (User Equipment, UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, and a user agent.
  • the access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), with wireless communication.
  • PLMN public land mobile network
  • the present application describes various embodiments in connection with a network device.
  • the network device may be a device for communicating with the terminal device, for example, may be a GSM system or a base station in CDMA (Base The Transceiver Station (BTS) may also be a base station (NodeB, NB) in the WCDMA system, or may be an evolved base station (Evolutional Node B, eNB or eNodeB) in the LTE system, or the network device may be a relay station or an access station. Point, in-vehicle device, wearable device, and network side device in a future 5G network or network side device in a future evolved PLMN network.
  • BTS Base The Transceiver Station
  • FIG. 1 and FIG. 2 are schematic diagrams of an application scenario of an embodiment of the present application.
  • FIG. 1 exemplarily shows one network device and two terminal devices.
  • the wireless communication system may include a plurality of network devices and may include other numbers of terminal devices within the coverage of each network device, the present invention The embodiment does not limit this.
  • the wireless communication system may further include other network entities such as a Mobile Management Entity (MME), a Serving Gateway (S-GW), and a Packet Data Network Gateway (P-GW).
  • MME Mobile Management Entity
  • S-GW Serving Gateway
  • P-GW Packet Data Network Gateway
  • embodiments of the invention are not limited thereto.
  • the terminal device 20 and the terminal device 30 can communicate in a D2D communication mode.
  • the terminal device 20 and the terminal device 30 directly communicate through a D2D link, ie, a side link (Sidelink, SL).
  • a side link Sidelink, SL
  • the terminal device 20 and the terminal device 30 directly communicate via a side line.
  • the terminal device 20 and the terminal device 30 communicate by a side line, and the transmission resources thereof are allocated by the network device; in FIG. 2, the terminal device 20 and the terminal device 30 pass the side link. Communication, whose transmission resources are independently selected by the terminal device, does not require the network device to allocate transmission resources.
  • the D2D communication may refer to a vehicle to vehicle (V2V) communication or a vehicle to Everything (V2X) communication.
  • V2X communication X can refer to any device with wireless receiving and transmitting capabilities, such as but not limited to slow moving wireless devices, fast moving in-vehicle devices, or network control nodes with wireless transmit and receive capabilities. It should be understood that the embodiment of the present invention is mainly applied to the scenario of V2X communication, but can also be applied to any other D2D communication scenario, which is not limited in this embodiment of the present invention.
  • a terminal device having a listening capability such as a Vehicle User Equipment (VUE) or a Pedestrian User Equipment (PUE), and no listening.
  • VUE Vehicle User Equipment
  • PUE Pedestrian User Equipment
  • Capable terminal equipment such as PUE.
  • VUE has higher processing power and is usually powered by the battery in the car, while PUE has lower processing power, and reducing power consumption is also a major factor that PUE needs to consider. Therefore, in the existing car network system, VUE is considered to have Full reception and listening capabilities; while PUE is considered to have partial or no reception and listening capabilities.
  • the resource selection may be performed by using a similar listening method as the VUE, and the available resources are selected on the part of the resources that can be intercepted; if the PUE does not have the listening capability, the PUE randomly selects the transmission resource in the resource pool.
  • transmission mode 3 (mode 3) and transmission mode 4 (mode 4).
  • the transmission resource of the terminal device using the transmission mode 3 is allocated by the base station, and the terminal device performs data transmission on the side line according to the resource allocated by the base station; the base station may allocate the resource for the single transmission to the terminal device, or may be the terminal.
  • the device allocates resources that are semi-statically transmitted. If the terminal device using the transmission mode 4 has the capability of listening, the data is transmitted by means of sensing and reservation. If the listening capability is not available, the transmission resource is randomly selected in the resource pool.
  • the terminal device with the interception capability acquires the available resource set by means of interception in the resource pool, and the terminal device randomly selects one resource from the set for data transmission. Since the service in the car network system has periodic characteristics, the terminal device usually adopts a semi-static transmission mode, that is, after the terminal device selects one transmission resource, the terminal device continuously uses the resource in multiple transmission cycles, thereby reducing the resource weight. The probability of selection and resource conflicts.
  • the terminal device carries the information for reserving the next transmission resource in the control information of the current transmission, so that the other terminal device can determine whether the resource is reserved and used by the terminal device by detecting the control information of the terminal device. Reduce the purpose of resource conflicts.
  • the terminal device can perform the method shown in FIG. 3, for example, when performing resource sensing.
  • each sidelink process one carrier can include two processes
  • resource selection or resource reselection is required, and the terminal device is based on the front
  • the listening result of the listening window of 1s ie 1000ms
  • T1 and T2 can satisfy, for example, T1 ⁇ 4, 20 ⁇ T2 ⁇ 100.
  • the first 1 s described later is the first 1 s of the pointer for the time n.
  • the specific resource selection process is as follows.
  • the terminal device 20 listens to the resources of the terminal device 30 as an example for description:
  • the resources on another subframe are excluded from the candidate resource set S_A, and the resources on the subframe in which the transmission resource reserved by the terminal device 20 according to a certain transmission period is also excluded from the candidate resource.
  • the source set is outside the S_A.
  • the transmission period may be an element in a set of transmission periods, which may be, for example, ⁇ 20, 50, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000 ⁇ ms. For example, as shown in FIG.
  • the terminal 20 will use the resource A1. Excluded from the candidate resource set S_A.
  • the terminal device 20 detects the physical sidelink control channel (PSCCH) sent by the terminal device 30 in the listening window of the first 1 s, and the physical side row shared channel corresponding to the PSCCH
  • the measured value of the Reference Signal Received Power (RSRP) of the (Physical Sidelink Shared Channel, PSSCH) is higher than the PSSCH-RSRP threshold, and the detected PSCCH indicates that the terminal device 30 that sends the PSCCH reserves the subsequent
  • the time-frequency resource required for transmission (for example, in FIG. 3, the time-frequency resource reserved by the terminal device 30 is a time-domain location corresponding to the resource B in the listening window, which is located after the resource B, 100 ms, 200 ms, 300 ms, ..., etc.
  • the time-frequency resource B1) determines the time-frequency resource reserved by the terminal device 30 in the selection window, and the time-frequency resource selected by the user in the selection window for transmitting data (for example, in FIG. 3,
  • the time-frequency resource reserved by the terminal device 20 is whether the time-frequency resource A1) located after the resource A corresponding to the resource A in the listening window overlaps (including all overlapping or partial overlapping). If there is an overlap, that is, a resource conflict occurs, the terminal device 20 excludes the time-frequency resource within the selection window from the candidate resource set S_A. At this time, it is assumed that the number of remaining resources in the candidate resource set S_A is equal to B.
  • the terminal device 20 may increase the PSSCH-RSRP threshold by 3 dB, and repeat steps (0) through (2) until B ⁇ A ⁇ 20 %.
  • the PSSCH-RSRP threshold that is finally obtained is the PSSCH-RSRP threshold corresponding to the carrier where the side-line process is located.
  • the terminal device 20 receives the received information for the remaining B resources in the candidate resource set S_A.
  • RSSI Received Signal Strength Indicator
  • the terminal device 20 selects a time-frequency resource for data transmission in the candidate resource set S_B with equal probability.
  • time-frequency resource occupied by the data channel corresponding to a certain control channel is referred to as a time-frequency resource (or a resource block) for transmitting the data channel, and the candidate resource set in each selection window is included.
  • resources A1 and B1 in FIG. 3 can be referred to as one time-frequency resource.
  • the terminal device 20 After the terminal device 20 selects the time-frequency resource for data transmission, the time-frequency resource is continuously used in each transmission cycle of the subsequent transmission process, and the time-frequency resource C_resel is used in total, wherein C_resel is a resource reselection counter ( Resource Reselection Counter), the value of C_resel is decremented by 1 every time data is transmitted.
  • C_resel is a resource reselection counter ( Resource Reselection Counter)
  • the value of C_resel is decremented by 1 every time data is transmitted.
  • the terminal device 20 When the value of C_resel is reduced to 0, the terminal device 20 generates a random number between [0, 1] and maintains the probability of resources (Probability).
  • the resource Keep, ProbResourceKeep parameter is compared. The parameter indicates the probability that the terminal device continues to use the resource. If the value of the random number is greater than the parameter, the terminal device 20 performs resource reselection. If the value of the random number is smaller than the parameter
  • the current data transmission may be performed using one or more of the candidate multiple carriers.
  • a terminal device using transmission mode 4 may select one or more carriers among a plurality of candidate carriers for current data transmission, and a terminal device using transmission mode 3 may perform current according to one or more carriers selected by the base station. data transmission.
  • the terminal device can measure the congestion degree of the system, for example, the Channel Busy Ratio (CBR), and the base station can instruct the terminal device to report the measurement result to the base station, so that the base station configures the transmission parameter according to the CBR configured by the terminal device, for example, the terminal device allows.
  • Modulation Coding Mode MCS
  • PBR physical resource blocks
  • the CBR can be used for the terminal device to perform carrier selection in multiple carriers. For example, the terminal device can select the lowest carrier of the CBR for data transmission according to the CBR measurement result of multiple carriers.
  • the CBR reflects the channel occupancy in the past 100 ms.
  • the terminal device may not satisfy the terminal device according to the carrier selected by the CBR of the multiple carriers in the past 100 ms.
  • the delay requirement of the transmitted service that is, within the delay requirement of the service (for example, 10 ms), the most suitable transmission resource may not be selected for transmission of the service.
  • the embodiment of the present application proposes that, according to the delay T of the target service to be transmitted, the terminal device selects according to the channel occupancy ratio CBR of the multiple carriers in the subframe [nP, n-P+(T-1)].
  • the target carrier of the target service is transmitted, so that effective carrier selection can be realized under the condition that the delay requirement is met.
  • FIG. 4 is a schematic flowchart of a method for selecting a carrier in D2D communication according to an embodiment of the present application.
  • the method shown in FIG. 4 can be performed by a terminal device, which can be, for example, the terminal device 20 or the terminal device 30 shown in FIG. 2.
  • the method for selecting a carrier in the D2D communication includes:
  • the terminal device acquires CBRs of a plurality of carriers within a subframe [n-P, n-P+(T-1)].
  • the T is the time delay of the target service to be transmitted
  • the subframe n is the time when the target service arrives, or the time at which the terminal device needs to perform carrier selection or resource selection
  • the terminal device performs the carrier selection on the multiple carriers according to the CBR of the multiple carriers to obtain a target carrier for transmitting the target service.
  • the terminal device selects a target carrier for transmitting the target service according to a channel occupancy ratio CBR of the plurality of carriers in the subframe [nP, n-P+(T-1)], wherein the target service to be transmitted is considered.
  • the delay T is such that effective carrier selection can be achieved under the condition that the delay requirement is met.
  • the terminal device may acquire a channel occupancy ratio CBR of multiple carriers in a subframe [nP, n-P+(T-1)], and select CBR among the multiple carriers according to CBR of the multiple carriers.
  • the smallest carrier acts as the target carrier for transmitting the target service.
  • the terminal device performs the carrier selection in the multiple carriers according to the CBR of the multiple carriers, where: the terminal device separately performs CBR according to the multiple carriers. Filtering the CBRs of the multiple carriers to obtain CBRs of the filtered multiple carriers; and selecting the target carriers among the multiple carriers according to the filtered CBRs of the multiple carriers.
  • the terminal device acquires CBRs of the multiple carriers in the subframe [nP, n-P+(T-1)], and performs filtering processing on the CBRs of the multiple carriers to obtain the filtered processing. CBR of the carrier. Then, the target carrier is selected among the plurality of carriers according to the filtered CBR of the multiple carriers.
  • the CBR of each carrier may change rapidly with the change of the location of the terminal device, or change with time, the CBR of each carrier is filtered by filtering the measured values of the CBR of each carrier. It tends to be stable, which reduces the frequency of carrier selection and ensures the stability of the system.
  • performing filtering processing on the CBRs of the multiple carriers includes: performing smoothing filtering on CBRs of the multiple carriers.
  • the manner of smoothing filtering is not limited in the embodiment of the present application.
  • CBR_new is the CBR of each carrier after filtering
  • CBR_current is the CBR of each carrier before filtering
  • CBR_old is the CBR of each carrier after the last filtering
  • a is the filter coefficient and 0 ⁇ a ⁇ 1.
  • FIG. 5 is a schematic flowchart of a method for selecting a carrier in D2D communication according to an embodiment of the present application.
  • the method shown in FIG. 5 can be performed by a terminal device, which can be, for example, the terminal device 20 or the terminal device 30 shown in FIG. 2.
  • the method for selecting a carrier in the D2D communication includes:
  • the physical layer of the terminal device performs resource sensing on multiple carriers in a time interval [n+T1, n+T2], where n is the time at which the target service to be transmitted arrives, or determines that the terminal device needs to perform When the carrier is selected or the resource is selected, 0 ⁇ T1 ⁇ T2.
  • the T2 is less than or equal to the delay of the target service.
  • the terminal device since the terminal device considers the delay of the target service, it is possible to implement effective carrier selection under the condition that the delay requirement is satisfied.
  • the physical layer of the terminal device determines, according to the result of the resource interception, a set of available resources on the multiple carriers that can be used to transmit the target service, and multiple physical side links corresponding to the multiple carriers.
  • the shared channel reference signal receives the power PSSCH-RSRP threshold.
  • the PSSCH-RSRP of the resource in the available resource set on each carrier is less than or equal to the PSSCH-RSRP threshold corresponding to each carrier.
  • the terminal device performs the carrier selection according to multiple PSSCH-RSRP thresholds corresponding to the multiple carriers to obtain a target carrier for transmitting the target service.
  • the physical layer of the terminal device performs resource sensing on the candidate multiple carriers in the time interval [n+T1, n+T2], and determines, according to the interception result, that the multiple carriers are available for transmitting the target.
  • n is the time when the target service arrives, or n is the time at which the first terminal device determines that carrier selection or resource selection is required.
  • the physicality of the first terminal device may receive the request sent by its upper layer at time n, so that the physical layer of the first terminal device decides at time n that carrier selection or resource selection needs to be performed within the time interval [n+T1, n+T2], so as to The target service looks for transmission resources.
  • the terminal device determines a process of a set of available resources on each carrier, for example, reference may be made to steps (0) through (4) in the description in FIG. For example, assuming that the first carrier is included in the multiple carriers, the terminal device performs resource sensing on the first carrier within a time interval [n+T1, n+T2], and excludes the PSSCH according to the interception result. - the resource whose RSRP measurement value is higher than the PSSCH-RSRP threshold and occupied and reserved by other terminal devices, and further selects the resource with the lowest RSSI measurement value which accounts for 20% of the total number of resources in the selection window among the remaining resources, wherein is selected The 20% of the resources constitute the set of available resources on the first carrier.
  • the set of available resources can be understood as the candidate resource set S_B obtained after completing step (4).
  • the PSSCH-RSRP threshold corresponding to the first carrier is the PSSCH-RSRP threshold used when the step (2) or (3) finally satisfies B ⁇ A ⁇ 20%.
  • the method for acquiring the available resource set on the carrier other than the first carrier, and the method for obtaining the PSSCH-RSRP threshold corresponding to the other carrier may refer to the description of the first carrier. For the sake of brevity, it will not be repeated here.
  • the terminal device may perform carrier selection according to multiple PSSCH-RSRP thresholds corresponding to the multiple carriers, thereby acquiring a target carrier for transmitting the target service.
  • the terminal device may select an appropriate time-frequency resource for transmitting the target service in the available resource set on the target carrier.
  • the terminal device determines, according to the multiple PSSCH-RSRP thresholds corresponding to the multiple carriers, the target carrier used for transmitting the target service, which may be implemented in the following two manners.
  • the terminal device determines, according to the multiple PSSCH-RSRP thresholds corresponding to the multiple carriers, a target carrier for transmitting the target service, where the physical layer of the terminal device is configured according to multiple PSSCHs corresponding to the multiple carriers.
  • the method further includes: the physical layer of the terminal device reports the set of available resources on the target carrier to a higher layer of the terminal device, and/or the physical layer of the terminal device uses the target carrier The index is reported to the upper layer of the terminal device; the upper layer of the terminal device selects a resource for transmitting the target service in the available resource set on the target carrier.
  • the terminal device determines, according to the multiple PSSCH-RSRP thresholds corresponding to the multiple carriers, a target carrier for transmitting the target service, where the physical layer of the terminal device reports the multiple to the high layer of the terminal device.
  • a plurality of PSSCH-RSRP thresholds corresponding to the carrier; the higher layer of the terminal device selects, according to the multiple PSSCH-RSRP thresholds corresponding to the multiple carriers, a carrier with the smallest PSSCH-RSRP threshold as the target carrier.
  • the method further includes: the physical layer of the terminal device reports the available resource set on the multiple carriers to the upper layer of the terminal device; the upper layer of the terminal device is in the available resource set on the target carrier , select the resource used to transfer the target service.
  • the physical layer of the terminal device selects a carrier with the smallest PSSCH-RSRP threshold as the target carrier among the multiple PSSCH-RSRP thresholds corresponding to the multiple carriers, and uses the target carrier.
  • the resource set and/or the index of the target carrier is reported to its upper layer.
  • the upper layer of the terminal device selects a resource for transmitting the target service in a set of available resources on the target carrier.
  • the multiple PSSCH-RSRP thresholds may be directly reported to the upper layer of the terminal device, and the PSSCH is selected by the upper layer.
  • the carrier with the smallest RSRP threshold is used as the target carrier.
  • the physical layer of the terminal device may also report the set of available resources on the determined plurality of carriers at the same time, so that the upper layer of the terminal device selects, in the set of available resources on the target carrier, the target service.
  • the terminal device may obtain multiple PSSCH-RSRP thresholds corresponding to the multiple carriers in the process of determining the available resource set on the multiple carriers, and according to the multiple corresponding to the multiple carriers,
  • the PSSCH-RSRP threshold effectively implements carrier selection, thereby enabling the branch
  • a terminal device in a system with multi-carrier transmission can acquire resources in the selected carrier for data transmission.
  • the size of the sequence numbers of the foregoing processes does not mean the order of execution sequence, and the order of execution of each process should be determined by its function and internal logic, and should not be applied to the embodiment of the present application.
  • the implementation process constitutes any limitation.
  • the method for carrier selection in D2D communication according to the embodiment of the present application is described in detail above.
  • the device according to the embodiment of the present application will be described below with reference to FIG. 6 to FIG. 9.
  • the technical features described in the method embodiment are applicable to the following device implementation. example.
  • FIG. 6 is a schematic block diagram of a terminal device 600 according to an embodiment of the present application. As shown in FIG. 6, the terminal device 600 includes an obtaining module 610 and a carrier selecting module 620620. among them:
  • the obtaining module 610 is configured to obtain a channel occupancy ratio CBR of the multiple carriers in the subframe [nP, n-P+(T-1)], where T is a delay of the target service to be transmitted, and the subframe n is Determining when the target service arrives, or determining, for the terminal device, a time at which carrier selection or resource selection is required;
  • the carrier selection module 620 is configured to perform the carrier selection in the multiple carriers according to the CBR of the multiple carriers acquired by the acquiring module 610 to obtain a target carrier for transmitting the target service.
  • the terminal device selects a target for transmitting the target service according to the delay T of the target service to be transmitted according to the channel occupancy ratio CBR of the plurality of carriers in the subframe [nP, n-P+(T-1)].
  • Carrier so that effective carrier selection can be achieved while satisfying the delay requirements.
  • the carrier selection module 620 is specifically configured to: perform filtering processing on the CBRs of the multiple carriers, respectively, to obtain CBRs of the filtered multiple carriers; according to the filtered multiple carriers CBR, selecting the target carrier among the plurality of carriers.
  • the carrier selection module 620 is specifically configured to perform smoothing filtering on the CBRs of the multiple carriers.
  • CBR_current is the CBR of each carrier before filtering
  • CBR_old is the CBR of each carrier after the last filtering
  • a is a filter coefficient and 0 ⁇ a ⁇ 1.
  • the carrier selection module 620 is specifically configured to: select, according to the CBR of the multiple carriers, a carrier with a minimum CBR as the target carrier among the multiple carriers.
  • terminal device 600 can perform the corresponding operations of the method 400 performed by the terminal device in the foregoing method embodiment, and details are not described herein for brevity.
  • FIG. 7 is a schematic block diagram of a terminal device 700 according to an embodiment of the present application. As shown in FIG. 7, the terminal device 700 includes a physical layer module 710 and a high layer module 720. among them:
  • the physical layer module 710 is configured to perform resource sensing on multiple carriers in a time interval [n+T1, n+T2], where n is the time when the target service to be transmitted arrives, or the terminal device determines the need When the carrier selection or resource selection is performed, 0 ⁇ T1 ⁇ T2;
  • the physical layer module 710 is further configured to: determine, according to a result of the resource interception, an available resource set that is available to transmit the target service on the multiple carriers, and multiple physical entities corresponding to the multiple carriers a side channel shared channel reference signal receiving power PSSCH-RSRP threshold, wherein a PSSCH-RSRP of a resource in a set of available resources on each carrier is less than or equal to a PSSCH-RSRP threshold corresponding to each carrier;
  • the physical layer module 710 is further configured to perform the carrier selection according to multiple PSSCH-RSRP thresholds corresponding to the multiple carriers to obtain a target carrier for transmitting the target service; or
  • the high-level module 720 is further configured to perform the carrier selection according to multiple PSSCH-RSRP thresholds corresponding to the multiple carriers to obtain a target carrier for transmitting the target service.
  • the terminal device may obtain multiple PSSCH-RSRP thresholds corresponding to the multiple carriers, and effectively use multiple PSSCH-RSRP thresholds corresponding to the multiple carriers.
  • Carrier selection is implemented such that a terminal device in a system supporting multi-carrier transmission can acquire resources in the selected carrier for data transmission.
  • the physical layer module 710 is specifically configured to: select, according to the multiple PSSCH-RSRP thresholds corresponding to the multiple carriers, a carrier with a minimum PSSCH-RSRP threshold as the target carrier.
  • the physical layer module 710 is further configured to report the available resource set on the target carrier to the high-level module 720, and/or the physical layer module 710 reports the index of the target carrier.
  • the high-level module 720 is further configured to: select, in the set of available resources on the target carrier, a resource used to transmit the target service.
  • the physical layer module 710 is further configured to report, by the high-level module 720, a plurality of PSSCH-RSRP thresholds corresponding to the multiple carriers, where the high-level module 720 is specifically configured to: according to the multiple carriers Corresponding multiple PSSCH-RSRP thresholds, selecting among the multiple carriers The carrier with the smallest PSSCH-RSRP threshold is used as the target carrier.
  • the physical layer module 710 is further configured to: report the available resource set on the multiple carriers to the high-level module 720; the high-level module 720 is further configured to: use resources on the target carrier In the collection, a resource for transmitting the target service is selected.
  • T2 is less than or equal to a delay of the target service.
  • terminal device 700 can perform the corresponding operations of the method 500 performed by the terminal device in the foregoing method embodiment. For brevity, no further details are provided herein.
  • FIG. 8 is a schematic structural diagram of a terminal device 800 according to an embodiment of the present application.
  • the terminal device includes a processor 810, a transceiver 820, and a memory 830, wherein the processor 810, the transceiver 820, and the memory 830 communicate with each other through an internal connection path.
  • the memory 830 is for storing instructions
  • the processor 810 is configured to execute instructions stored by the memory 830 to control the transceiver 820 to receive signals or send signals.
  • the processor 810 can call the program code stored in the memory 830 to perform the corresponding operations of the method 400 performed by the terminal device in the method embodiment.
  • the processor 810 can call the program code stored in the memory 830 to perform the corresponding operations of the method 400 performed by the terminal device in the method embodiment.
  • the processor 810 can call the program code stored in the memory 830 to perform the corresponding operations of the method 500 performed by the terminal device in the method embodiment.
  • the processor 810 can call the program code stored in the memory 830 to perform the corresponding operations of the method 500 performed by the terminal device in the method embodiment.
  • the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capability.
  • each step of the foregoing method embodiment may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software.
  • the processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA), or the like. Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the above The steps of the law.
  • the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be a read-only memory (ROM), a programmable read only memory (PROM), an erasable programmable read only memory (Erasable PROM, EPROM), or an electric Erase programmable read only memory (EEPROM) or flash memory.
  • the volatile memory can be a Random Access Memory (RAM) that acts as an external cache.
  • RAM Random Access Memory
  • many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (Synchronous DRAM).
  • SDRAM Double Data Rate SDRAM
  • DDR SDRAM Double Data Rate SDRAM
  • ESDRAM Enhanced Synchronous Dynamic Random Access Memory
  • SLDRAM Synchronous Connection Dynamic Random Access Memory
  • DR RAM direct memory bus random access memory
  • FIG. 9 is a schematic structural diagram of a system chip according to an embodiment of the present application.
  • the system chip 900 of FIG. 9 includes an input interface 901, an output interface 902, at least one processor 903, and a memory 904.
  • the input interface 901, the output interface 902, the processor 903, and the memory 904 are interconnected by an internal connection path.
  • the processor 903 is configured to execute code in the memory 904.
  • the processor 903 can implement the method 400 performed by the terminal device in the method embodiment. For the sake of brevity, it will not be repeated here.
  • the processor 903 can implement the method 500 performed by the terminal device in the method embodiment. For the sake of brevity, it will not be repeated here.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or may be Integrate into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one monitoring unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present application which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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

Abstract

La présente invention concerne un procédé de sélection de porteuse dans une communication D2D et un dispositif terminal. Ledit procédé comprend les étapes suivantes : un dispositif terminal acquiert un rapport d'occupation de canal (CBR) d'une pluralité de porteuses dans une sous-trame [n-P, n-P+(T-1)], T étant un retard d'un service cible à transmettre, et la sous-trame n étant le moment où arrive le service cible, ou détermine, pour le dispositif terminal, le moment où une sélection de porteuse ou une sélection de ressource doit être effectuée ; le dispositif terminal effectue, dans la pluralité de porteuses, une sélection de porteuse selon le CBR de la pluralité de porteuses, de façon à acquérir une porteuse cible pour transmettre le service cible. Par conséquent, le dispositif terminal peut permettre une sélection de porteuse efficace tout en satisfaisant aux exigences de retard.
PCT/CN2017/109401 2017-11-03 2017-11-03 Procédé de sélection de porteuse dans une communication d2d et dispositif terminal WO2019084925A1 (fr)

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