WO2021026742A1 - 一种自主性信道资源选择方法 - Google Patents

一种自主性信道资源选择方法 Download PDF

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WO2021026742A1
WO2021026742A1 PCT/CN2019/100272 CN2019100272W WO2021026742A1 WO 2021026742 A1 WO2021026742 A1 WO 2021026742A1 CN 2019100272 W CN2019100272 W CN 2019100272W WO 2021026742 A1 WO2021026742 A1 WO 2021026742A1
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resources
zone
resource
ues
psfch
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PCT/CN2019/100272
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English (en)
French (fr)
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张波
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张波
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Definitions

  • the present invention relates to a communication method, in particular to a channel resource selection method that can avoid channel resource selection conflicts.
  • NR New Radio
  • V2X Vehicle to Everything
  • channel resources autonomous channel resource selection
  • a new mechanism is applied to the selection of the V2X sidelink resource pool, and the mechanism is related to the zone identification (for example, zone ID, Zone-ID).
  • zone identification for example, zone ID, Zone-ID
  • independent resources or resource pools are related to geographic coordinates and are (pre-)configured by the V2X sidelink communication upper layer.
  • Tx UE Transmitter UE
  • Tx UE depends on the area ID and only accesses the resource pool related to the geographic coordinates of the Tx UE.
  • the Tx UE uses its last geographic coordinates to implement the resource pool selection. Through the following formula, Tx UE determines Zone-ID:
  • Zone-ID y 1 N x +x 1 ,
  • L is the length of the zone
  • W is the width of the zone
  • N x is the longitude of Zone-ID
  • N y is the latitude of Zone-ID
  • x and y are the longitude, latitude and reference coordinates (0,0 )the distance between.
  • the information of L, W, N x and N y can be configured by the upper RRC or realized by a pre-configuration method.
  • (pre)configuration means configuration or preconfiguration.
  • the parameters L, W, N x , N y are configured by RRC (Radio Resource Control, Radio Resource Control) in Type-21 or Type-26 System Information Block (SIB) , Or pre-configured in the SL-V2X-Preconfiguration system. Therefore, N b bits are required to indicate the N x ⁇ N y Zone-IDs that constitute a zone block (ZB, Zone Block), where:
  • each ZB includes 9 zones, and each zone is enclosed by zone length L and zone width W.
  • the number of zones in each ZB depends on the zone-ID longitude and latitude values.
  • there are 1, 3, and 2 vehicles in the zones with Zone-ID 0, 4, and 8, respectively.
  • LTE-V2X communication data packets are relatively simple, only considering the arrival and transmission of periodic data packets, and the data packet size is also constant.
  • NR-V2X there are three types of communication transmission (Cast): broadcast (Broadcast), unicast (Unicast) and multicast (Groupcast).
  • the arrival of data packets can be either periodic or aperiodic.
  • the packet size can be constant or not.
  • Tx UE sends and exchanges location information through Zone-ID or geographic coordinates.
  • the Tx UE sends the SCI (Sidelink Control Indication) through the PSCCH (physical sidelink control channel), and the receiving user (Rx UE, Receive UE) in the relevant group detects the SCI and obtains the Zone-ID of the Tx UE. And get the distance to Tx UE.
  • SCI Segment Control Indication
  • PSCCH physical sidelink control channel
  • Tx UE when a user (UE) sends a data packet, the UE is defined as Tx UE, and when receiving a data packet, it is defined as Rx UE. Therefore, the same user is Tx UE in a certain time slot, and Rx UE in a certain time slot.
  • the resource pool is (pre-)configured in each area and does not consider the utilization of Tx UE. Therefore, some areas may not be used by Tx UE, resulting in waste of dedicated resources.
  • Tx UEs in each area is not balanced. If the number of Tx UEs is greater than the number of available resources in the resource pool, the resources may be exhausted. Therefore, if there is no congestion control or flexible resource control mechanism, resource conflicts will occur.
  • the problem to be solved by this application is: in the existing V2X sidelink resource pool selection technology, resource utilization is low and resource selection conflicts.
  • this application provides an autonomous channel resource selection method.
  • the resource in this application can be PSSCH (Physical Sidelink Shared Channel), PSCCH (Physical Sidelink Control Channel), or PSFCH (Physical Sidelink Feedback Channel).
  • PSSCH Physical Sidelink Shared Channel
  • PSCCH Physical Sidelink Control Channel
  • PSFCH Physical Sidelink Feedback Channel
  • N is a natural number
  • the area ID in the nth area is Zone-ID-n
  • n is a natural number selected from 0 to N-1
  • each Tx UE shares the user source L1 ID (User Source L1 ID) and LUT (Location Update Timing); among them, the source L1 ID It is the ID of the Tx UE at the PHY layer, and the Tx UE sends the SCI to the Rx UE on the PSCCH channel.
  • Each Rx UE obtains the Tx UE source through explicit location acquisition (explicit location acquisition) or implicit location acquisition (implicit location acquisition).
  • L1 ID and Tx UE location information, and related transmission time information each Rx UE stores all Tx UE LUT information and Tx UE source L1 ID (hereinafter Tx UE source L1 ID is referred to as source ID).
  • all Tx UEs in Zone-ID-n independently create the same two-dimensional resource mapping table (Resource Mapping Table, RMT) that represents Zone-ID-n. ), denoted as RMT(n), once Rx UE obtains received information from Tx UE, RMT(n) is updated at the same time; RMT(n) uses source ID and LUT as two dimensions;
  • RMT Resource Mapping Table
  • Tx UE selects resources by itself; the same number of resources will be selected by the same number of Tx UEs;
  • the Tx UE source ID is different, based on the gradual sequence of the source ID, the Tx UE selects the resource individually. Therefore, the resources selected by different Tx UEs will not overlap or conflict.
  • Tx UEs select resources respectively. Therefore, the resources selected by different Tx UEs will not overlap or conflict;
  • the Tx UE selects resources based on the self-detection procedure (Sensing Procedure).
  • N is a natural number
  • the area ID in the nth area is Zone-ID-n
  • n is a natural number selected from 0 to N-1
  • each Tx UE shares the source ID and LUT (Location Update Timing); the Tx UE sends the SCI to the Rx UE through the PSCCH channel.
  • An Rx UE obtains the Tx UE source ID and Tx UE location information, and obtains the relevant time through explicit location acquisition (explicit location acquisition) or implicit location acquisition (implicit location acquisition).
  • Each Rx UE stores the latest information of all Tx UEs. The sending time of the LUT;
  • all Tx UEs in Zone-ID-n independently create the same two-dimensional resource mapping table (Resource Mapping Table, RMT) that represents Zone-ID-n. ), denoted as RMT(n), once Rx UE obtains reception information from Tx UE, RMT(n) is updated at the same time;
  • RMT Resource Mapping Table
  • each Tx UE can accurately detect the SCI of the PSCCH, and can obtain the information of other Tx UEs in the same area and other areas through the SCI;
  • the steps of the resource selection method include:
  • Zone-ID-n resource of the Tx UE is in a shortage state, judge whether there are available resources in other areas, and if so, use the Zone-ID of other areas as the Tx UE to temporarily allocate a new temporary Zone-ID To obtain resources originally allocated to other regions;
  • Tx UE selects resources by itself; the same number of resources will be selected by the same number of Tx UEs;
  • the Tx UEs select resources individually, so the resources selected by different Tx UEs will not overlap or conflict.
  • Tx UEs select resources respectively, so the resources selected by different Tx UEs will not overlap or conflict;
  • the Tx UE selects resources based on the self-detection procedure (Sensing Procedure).
  • the other areas are adjacent areas.
  • the resources in the area where the Tx UE is located are in a state of shortage, it is determined whether the resources in its neighboring areas are available, and if available, a new Zone-ID is temporarily allocated to the Tx UE as the temporary Zone-ID, and the original allocation to Resources in adjacent areas.
  • the resources of the adjacent area are in a shortage state, it is determined whether the resources of another adjacent area of the adjacent area are available, and if available, a new Zone-ID is temporarily allocated to the Tx UE as a temporary Zone-ID, Obtain the resources originally allocated to another adjacent area until the adjacent area with available resources is found, or the adjacent area is beyond the user communication range or outside the ZB.
  • the adjacent area is searched according to any one of a straight line direction, a clockwise direction, and a counterclockwise direction.
  • the Zone-ID of the adjacent zone is assigned to the Zone-ID-n zone as a temporary Zone-ID.
  • the timing starts.
  • every time a period of time is counted it stops using and releases the resources of the area used by the Tx UE.
  • Zone-ID-n zone resources are available, if available, stop using and release the resources of the zone used by the Tx UE, and start using Zone-ID-n zone resources .
  • the time period can be said to be (pre-)configured, or it can be configured through L1 signaling.
  • N regions are divided into K layers, and N and K are each independently natural numbers;
  • the Zone-ID of the kth layer is Zone-ID k , which is expressed as ( x k , y k ),
  • the information can be configured through the upper layer RRC, or achieved through pre-configuration.
  • the steps of the resource selection method include:
  • Tx UE is (pre-)configured in different regional layers.
  • resource R is allocated to Tx UEs in each ZB of the k-th layer, and multiple resources are allocated to multiple Tx UEs of each Zone-ID, but there is no difference between Tx UEs;
  • the length of the k+1 layer region is L k+1 and the width of the k+1 layer region is W k+1 , then
  • K layer Zone-IDs form ZB, which is represented by N k bits, among which,
  • the k+1 layer resource pool is configured as at least two sub-resource pools, and UEs that can send location Tx to other UEs are allowed to enter the first sub-resource pool, but cannot send location Tx to other UEs The UE is allowed to enter the second sub-resource pool.
  • each area is configured with the at least two sub-resource pools.
  • the sub-resource pool is divided into FDM (Frequency Division Multiplexing) based resources and TDM (Time Division Multiplexing) based resources.
  • FDM Frequency Division Multiplexing
  • TDM Time Division Multiplexing
  • the resource pool is a PSFCH (Physical Sidelink Feedback Channel) resource pool R PSFCH , which is composed of R PSFCH (m).
  • the PSFCH Resource Set (PSFCH Resource Set) has RRC configuration or system pre-configuration.
  • each Tx UE autonomously activates multiple (at least two) PSFCH resources or autonomously activates a PSFCH Resource Subset (PSFCH Resource Subset) through the SCI as the HARQ feedback resource.
  • PSFCH Resource Subset PSFCH Resource Subset
  • the PSFCH resource pool can be regarded as the original PSFCH resource set, and all combinations of PSFCH resources selected and activated by the Tx UE from the original PSFCH resource set can be regarded as the extended PSFCH resource set, the extended PSFCH resource set It depends on (pre-) configuration parameters M E, the original set of resources and extended PSFCH PSFCH resource sets are transparent to each other only dependent on the predetermined mapping table or formula.
  • the specific mapping table or formula can be configured through the upper RRC, or implemented through a pre-configuration method.
  • the PSFCH resource in the original PSFCH resource set is configured with a corresponding ID
  • the PSFCH resource subset in the extended PSFCH resource set is also configured with a corresponding ID.
  • the Tx UE sends a data packet with a related PSCCH (Physical Sidelink Control Channel) header through the PSSCH (Physical Sidelink Shared Channel) to activate the PSFCH resource subset configured with the corresponding ID.
  • PSCCH Physical Sidelink Control Channel
  • PSSCH Physical Sidelink Shared Channel
  • the Rx UE selects part of the PSFCH resources from the activated resource subset, and feeds back SCFI (Sidelink Control Feedback Information) containing HARQ NAK to the relevant Tx UE.
  • SCFI Segmentlink Control Feedback Information
  • the Rx UE if the Rx UE receives different data packets from more than two Tx UEs, the Rx UE selects part of the PSFCH resources from the activated PSFCH resource subset according to the information of the related PSCCHs, so that the selected PSFCH There is no duplication of resources. And feedback HARQ (Hybrid Automatic Repeat Request, hybrid automatic repeat request) NAK (negative acknowledgement, negative answer) to relevant multiple (at least two) Tx UEs. That is, the Rx UE detects the same PSFCH resources in the subset of activated PSFCH resources in the SCI information of different Tx UEs, then these same PSFCH resources will not be used as HARQ NAK resources.
  • HARQ Hybrid Automatic Repeat Request, hybrid automatic repeat request
  • NAK negative acknowledgement, negative answer
  • the Tx UE will receive corresponding PSFCHs from multiple Rx UE members for multicast, and detect whether there is NAK feedback, as long as the Tx UE detects more than one corresponding NAK in its activated PSFCH resources , Tx UE retransmits its data packets. Or, by combining all PSFCH resources (incoherent or coherent combination), the Tx UE detects whether there is NAK feedback. The Tx UE performs its data packet retransmission when detecting the corresponding NAK sent on the relevant PSFCH.
  • the PSFCH resource used for NAK transmission is defined as a random sequence with a constant length (length is Np), and the Np length random sequence is mapped to Np consecutive OFDM resource elements RE (Resource Element).
  • RE Resource Element
  • a subset of Np-length random sequence PSFCH resources are interleaved with each other in the time domain and the frequency domain.
  • some PSFCH resources are mapped on different time domain OFDM symbols (OFDM Symbol), and some PSFCH resources are mapped on different frequency domain RBs.
  • the PSFCH resources here constitute the PSFCH resource pool R PSFCH . Due to the limitation of OFDM symbols on PSFCH resources, generally only one OFDM symbol may be used by PSFCH resources, and PSFCH resource interleaving in the frequency domain may be more advantageous. This requires that the frequency domain spacing of the PSFCH resources is large enough to achieve the effect of transmission multi-polarization.
  • the feedback UE can take the form as follows.
  • the Rx UE receives different data packets from more than two Tx UEs, the Rx UE selects part of the PSFCH resources from the subset of the activated PSFCH resources according to the relevant SCI information, so that the selection of PSFCH resources is not repeated. That is, the Rx UE detects the same PSFCH resource in the subset of activated PSFCH resources in different SCI information, then these same PSFCH resources will not be used as HARQ NAK resources.
  • Tx UE will receive corresponding PSFCHs from multiple Rx UE members for multicast and check whether there is NAK feedback. As long as the Tx UE detects more than one corresponding NAK in its activated PSFCH resources, the Tx UE performs its data packet retransmission. Or, by combining all PSFCH resources (incoherent or coherent combination), the Tx UE detects whether there is NAK feedback. The Tx UE performs its data packet retransmission when detecting the corresponding NAK sent on the relevant PSFCH. It is worth noting that for the two receiving alternatives, the Tx UE does not need to know which PSFCH resources the Rx UE finally chose to use to send NAK information.
  • the source ID is divided into source L2 ID (MAC Layer-2 ID) and source L1 ID (Physical Layer-1 ID).
  • the source L2 ID is self-allocated by Tx UE and is provided by the V2X application layer. AS layer; the source L2 ID is divided into two bit strings at the MAC layer, one of which is the least significant bit (LSB, Least Significant Bit), which is sent to the physical layer as the sidelink control source L1 ID; the other bit string is the most significant bit Bit (MSB, Most Significant Bit) is placed in the MAC header; in the above statement or the following statement, the source ID sent by the SCI refers to the source L1 ID, which is obtained from the LSB.
  • LSB least significant bit
  • MSB most significant bit Bit
  • the source L2 ID is 24 bits.
  • the least significant bit is 8 bits.
  • the most significant bit is 16 bits.
  • the LUT is the gap update time.
  • This application introduces two new parameters, resource ID and geographic location update time, to avoid resource selection conflicts in related areas.
  • This application also provides a resource selection method in the case of MLZ; in addition, in order to avoid PSFCH resource conflicts, each Tx UE in this application automatically activates the configured PSFCH resource subset through the SCI to improve the reliability of HARQ feedback.
  • Figure 1 is a schematic diagram of nine zones based on location Zone-ID
  • FIG. 2 is a schematic diagram of Zone-ID-n where Tx UE is located
  • FIG. 3 is a schematic diagram of RMT
  • Figure 4 is a schematic diagram of resource selection based on temporary Zone-ID
  • FIG. 5 is a schematic diagram of Tx UE-i related RMT in Zone-ID-n;
  • Figure 6 is a schematic diagram of the K layer area
  • Figure 7 is a schematic diagram of the distance between Tx UE-7 and Rx UE-9 in a double-layer area
  • Figure 8 is a schematic diagram of resource selection in a two-tier area
  • Figure 9 is a schematic diagram of resource pool configuration in a two-tier area
  • Figure 10 is a schematic diagram of three Tx UEs sending data packets in the same time slot and automatically activating PSFCH resources.
  • geographic location information is indispensable and can be used for resource selection. This requires the Tx UE to share location information with other Tx UEs within the communication range.
  • the location of the Tx UE is generally represented by quantized coordinates with limited bits.
  • the quantified geographic location is equivalent to Zone-ID.
  • the Zone-ID can be (pre-)configured with the resource pool, and the Tx UE accesses the corresponding resource pool according to its own Zone-ID.
  • the location of the Tx UE is sent by the SCI through the PSCCH channel to improve the reliability of multicast within the communication range.
  • the radio communication range (Radio Communication Range, RCR) is different from the QoS communication range (QoS Communication Range, QCR) represented by each IP packet QoS (Quality of Service).
  • RCR Radio Communication Range
  • QCR QoS Communication Range
  • Zone-ID can be explicitly acquired by the Rx UE through the SCI transmitted through PSCCH (Physical Sidelink Control Channel), or through RRC information.
  • PSCCH Physical Sidelink Control Channel
  • Tx UE location information is encapsulated in SCI
  • Implicit Location Acquisition Based on Tx UE sends control and data signals, Rx UE obtains related resource pool information by implementing PSCCH and PSSCH related detection, and resource pool and Zone-ID are directly related ( Generally a one-to-one relationship). Therefore, the Rx UE can implicitly and indirectly obtain the Zone-ID of the Tx UE.
  • the source ID of the Tx UE is encapsulated in the SCI and sent through the PSCCH, and the Rx UE blindly checks the resource pool used by the PSCCH to identify the source ID of the Tx UE and obtain the zone-ID of the Tx UE.
  • PSSCH resource pool information can provide rougher Zone-ID information represented by MSB, and in each PSSCH resource (such as The PSCCH resource information of one or several subchannels (Subchannel/Subchannels) can provide more accurate Zone-ID information represented by LSB.
  • PSCCH Resource Set Physical Uplink Control Channel
  • the PSCCH resource location can be (pre-)configured in the PSSCH resource, and each PSCCH resource location in the PSCCH resource set can be It is associated with the Zone-ID represented by the LSB to achieve a relatively high-precision implicit location acquisition.
  • This mechanism can be used for unicast and multicast. Based on the currently implemented NR-V2X, the source ID of the Tx UE is always included in the SCI.
  • the Zone-ID obtained by the explicit location and the Zone-ID obtained by the implicit location can be different and can be used in different applications.
  • the Zone-ID area obtained by explicit location is relatively small, while the Zone-ID area obtained by implicit location is relatively large, and the application can be different.
  • the Zone-ID obtained by the explicit location can be used for user positioning, and the Zone-ID obtained by the implicit location can be used for resource allocation.
  • the implicit position acquisition method can help improve the positioning accuracy of the explicit position acquisition method.
  • the case of double or multilayer regions is given in Example 3 of this application.
  • Half-duplex means that once the UE is in the transmission mode, it cannot receive; similarly, the UE is in the receive mode and cannot transmit. Because half-duplex systems are in two-way communication, only one direction can be implemented at a time (not at the same time).
  • source ID and geographic location update time are known between two Tx UEs and can be used to avoid resource selection conflicts.
  • the source ID can be divided into source L2 ID (MAC Layer-2) and source L1 ID (Physical Layer-1).
  • the source L2 ID is allocated by the Tx UE and is provided by the V2X layer to the access (Access Stratum). , AS) layer, the source L2 ID is 24 bits long and is divided into two bit strings at the MAC layer.
  • the first bit string is the least significant bit (LSB) part (8 bits), which is sent to the physical layer as the sidelink control source L1 ID ;
  • the second bit string is the most significant bit (MSB) part (16 bits) and is placed in the MAC header.
  • the source L1 ID is sent from the Tx UE through the PSCCH through the SCI. It can be considered that the UE can know the source L1 ID from the Tx UE;
  • LUT is the location update time.
  • Tx UE sends SCI to Rx UE through PSCCH, and each Rx UE obtains the location information of Tx UE and related update time and stores the LUT.
  • the Rx UE can obtain location information through explicit location acquisition or implicit location acquisition methods; the stored LUT is used when the Rx UE selects resources.
  • the Tx UE sends the location information carrying the source ID encapsulated in the SCI through the PSCCH, and each UE explicitly knows the location information of the LUT of other UEs; however, in unicast traffic , Tx UE does not send location information, but sends the source ID in the SCI through PSCCH. Therefore, each UE implicitly knows that other UEs carry the location information of LUT;
  • Figure 2 shows the nth Zone-ID, where Tx UE-1 and Tx UE-2 are located in Zone-ID-n.
  • the spontaneous resource selection mechanism based on LTE-V2X is used, resource conflicts may be possible occur. Therefore, the source ID and LUT available between the two Tx UEs are used as auxiliary information to avoid source resource conflicts.
  • the number of resources is greater than or equal to the number of Tx UEs in the area.
  • the Tx UE does not need to worry about how many resources are available in the area.
  • the Tx UE only needs to avoid resource conflicts when each Tx UE spontaneously selects resources.
  • the necessary condition is to know the information of other UEs related to the same Zone-ID, and the sufficient condition is to know the source ID and LUT as auxiliary information to distinguish resources in the same area.
  • ——Tx UE is located in the nth zone and is marked as Zone-ID-n.
  • the 0th zone is marked as Zone-ID-0
  • the first zone is Zone-ID-1
  • the N-1th zone is Zone-ID -(N-1);
  • each Tx UE can create a two-dimensional resource mapping table (RMT) respectively, and those related to Zone-ID-n are marked as RMT(n).
  • RMT resource mapping table
  • the RMT needs to be updated at the same time.
  • each Tx UE can voluntarily select resources to avoid any conflicts in the area. Resource selection follows the following rules: first follow the source ID direction, and then follow the LUT direction.
  • each Tx UE is located in Zone-ID-n, which are drawn based on the shared source ID and LUT information in RMT.
  • the resource selection of each Tx UE adopts the following steps:
  • Step 1 Spontaneously allocate resources to Tx UEs based on the gradual sequence of source IDs, and allocate the same number of resources to the same number of Tx UEs sharing the same source ID; for example, Tx UE-2, Tx UE-3 and Tx in Figure 3 UE-7 can independently select resources based on source ID-1, ID-3, and ID-7. Two resources are allocated to two Tx UEs sharing a source ID-2, and three resources are allocated to three Tx UEs sharing a source ID-5;
  • Step 2 If there is more than one Tx UE sharing the same source ID, resources are allocated to Tx UEs based on the LUT ascending order; for example, in Figure 3, three Tx UEs share the source ID-5, and the three resources follow LUT-1, LUT -3.
  • the sequence of LUT-4 is configured to Tx UE-1, Tx UE-4 and Tx UE-8 respectively;
  • Step 3 If there is more than one Tx UE sharing the same source ID and the same LUT, resources are allocated to the Tx UE based on the self-detection procedure (Sensing Procedure).
  • the number of resources is less than the number of Tx UEs in the area.
  • Tx UE not only needs to avoid resource conflicts, but also needs to pay attention to the possibility of resource exhaustion in the region.
  • This embodiment proposes a solution for resource exhaustion based on the cooperation of adjacent areas.
  • Each Tx UE knows the relevant Tx UE information in the same area and the first-level adjacent area (the dark part in Figure 4), and then also knows the Tx UE information in the second-level adjacent area (the light part in Figure 4) ), these areas are all within the communication range. If the Tx UE is located in Zone-ID-n, the adjacent Zone-ID at the first level forms a ring in a clockwise direction, which is recorded as:
  • Zone-ID of the second level can also be ring-shaped clockwise outside the first level.
  • Zone-ID remapping is based on the following resource search process:
  • Zone-ID-n along the clockwise direction in Figure 4, looking for resources allocated to the first-level adjacent area, from Zone-ID-(n-1) to Zone-ID-(n-1) -N x );
  • the available resources in adjacent areas are defined as temporarily used resources, and these resources are temporarily mapped to the temporary Zone-ID;
  • Zone-ID-n If the Tx UE of Zone-ID-n does not find available resources in the first-level neighboring area, it will continue to search for resources allocated to the second-level neighboring area, and follow the clockwise direction in Figure 4 from Zone-ID- (n-2-N x )until Zone-ID-(n-2-2N x ); ——Continue searching operation until the available resources are found in the adjacent area, or the adjacent area searched has exceeded the communication range; in the communication range Inside, information such as the Zone-ID of the Tx UE and related RMT can be exchanged explicitly or implicitly;
  • Zone-ID-n where the Tx UE is located, as the temporary Zone-ID for resource selection, and start timing to control resource usage time;
  • the Tx UE uses the same mechanism for resource selection, as described in Embodiment 1. For example, in Figure 4, Tx UE-i is located in Zone-ID-n and faces a lack of resources. Then it finds that there are available resources in Zone-ID-(n-1). Tx UE-i sets Zone-ID-(n-1) ) As a temporary Zone-ID, and select resources related to Zone-ID-(n-1) from RMT-(n-1).
  • Figure 5 shows the RMT of Tx UE-i located in Zone-ID-n.
  • the number of RMTs is available for Tx UE-i, and all UEs can exchange information with Tx UE-i.
  • other UEs can also know the RMT of other Tx UEs, and therefore implicitly know which resources are selected by Tx UE-i, so as to avoid resource conflicts within the communication range.
  • Example 1 and Example 2 introduce the importance of the newly introduced parameters in the single layer zone (Single Layer Zone, SLZ) in the automatic resource selection process.
  • the accuracy of Zone-ID will be Will be affected. For example, if you want to use a more high-precision Zone-ID, the area range for repeated use will be reduced. On the contrary, to expand the area, the indication accuracy of Zone-ID will be worse. Therefore, the indication accuracy of Zone-ID and the area range of repeated use cannot be considered at the same time.
  • MLZ Multi-Layer Zone
  • MLZ is a region layered on multiple levels, and each layer is composed of a geographical area defined by LTE V2X and constructed separately .
  • Figure 6 shows the situation of the K layer, where two layers are drawn, namely the k layer and the k+1 layer.
  • the k layer area is expressed as the upper layer area or sub area
  • the k+1 layer area is expressed as the lower layer area or parent area. area.
  • Zone-ID k is defined as the Zone-ID of the kth layer, expressed by (x k , y k ), and the mathematical expression is as follows:
  • k 1, 2,...,K, 1 ⁇ i ⁇ Kk; L k is the value of the area length, W k is the value of the area width, Is the longitude of Zone-ID, Is the zone-ID latitude value, All are integers, which are used as the upper and lower parameters of the control area, and
  • L k is the value of the area length
  • W k is the value of the area width
  • Is the longitude of Zone-ID Is the zone-ID latitude value
  • K layer Zone-IDs form ZB, which is represented by N k bits, among which,
  • Each ZB contains 16 Zone-IDs, which require 4 bits to express the zone.
  • Zone-IDs of the first and second layers are expressed as:
  • Double-layer Zone-ID can be converted into SLZ Zone-ID (denoted as Zone-ID (SLZ) ) by:
  • the MLZ-based positioning solution can effectively avoid resource conflicts between different self-employed broadband wireless access (Broadband Wireless Accesses, BWA).
  • BWA Broadband Wireless Accesses
  • Tx UE location information is encapsulated in SCI and transmitted via PSCCH to improve multicast performance within the communication range.
  • Location information is generally represented by geographic Zone-ID with limited bits. Therefore, if we want to cover The area size of the communication area must be large, resulting in poor positioning accuracy.
  • the introduction of MLZ in this embodiment can solve this problem.
  • each ZB contains 16 zones, involving 16 Zone-IDs; in the second layer, each ZB contains 4 zones, involving 4 Zone-IDs, and a single resource pool is independently allocated to the second layer
  • the Rx UE can detect the SCI and obtain the following information: the zone-ID of the Tx UE in the first layer is used as explicit information, and the Tx UE is in the The Zone-ID of the second layer is used as implicit information.
  • the implicit information is transmitted between the Tx UE and the Rx UE and needs to be obtained by the Rx UE based on the resource pool used.
  • the Tx UE exceeds the area drawn in the figure, it can be solved by adding the longitude and latitude values of the second layer Zone-ID, and the second layer Zone-ID is covered by the upper layer. If configured (pre), no signaling overhead will be added. Therefore, to achieve the same positioning accuracy, the number of expression bits contained in the SCI in this example is reduced from 6 bits to 4 bits.
  • this embodiment adopts a double-layer area, and each ZB of the first layer and the second layer is a 4 ⁇ 4 area.
  • the first-level Zone-ID is marked as Zone-ID 1
  • the second-level Zone-ID is marked as Zone-ID 2.
  • each area configures resources independently, or according to TDM or according to FDM mode, due to parameters In the second layer Independent resources are mapped on the first layer of ZB.
  • the resources configured in Zone-ID 2 marked as 0, 1, 4, and 5 are mapped on the ZB of Zone-ID 1 marked as 0, 1,..., 15.
  • the first layer of ZB is limited to the physical communication range, Within this range, the UE can explicitly/implicitly exchange information, such as Zone-ID, source ID, and LUT, in the PSCCH through SCI.
  • the Tx UE for multicast communication selects the first-layer Zone-ID 1 related resources, while the unicast and broadcast Tx UEs select the second-layer Zone-ID 2 related resources.
  • resource selection is an independent process.
  • Zone-ID 1 of Tx UE can be obtained explicitly by Rx UE based on SCI, while Zone-ID 2 of Tx UE Based on the resource pool used by the Tx UE, the Rx UE can be explicitly obtained.
  • each Tx UE in each area of the first layer can know the information of other Tx UEs in the same layer and the same ZB, then each Tx UE can create a two-dimensional RMT related to the ZB.
  • RMT 1 (n) is mutually obtainable for all Tx UEs in the first layer ZB.
  • the resource selection of the same resource pool is as follows:-Tx UE obtains the potential number of Tx UEs in the first layer ZB, and may choose to configure it in the second layer.
  • Each Tx UE of Zone-ID 1 creates its own RMT. If multiple Tx UEs are involved in the same Zone-ID 1 , RMT is used to distinguish resources; resource selection depends on two-dimensional RMT, and the same method as in Embodiment 1 is adopted, namely: first in the source ID direction and then in the LUT direction.
  • resource pools are configured as FDM-based resources and TDM-based resources.
  • 4 frequency resource pools are (pre)configured, each frequency resource pool contains 8 sub-channels (sub-channel, SCH), each SCH is composed of multiple resource blocks (resource block, RB), the sub-channels in the resource pool are divided into Four first TDM-based sub-channels are used as the first sub-resource pool, and four second TDM-based sub-channels are used as the second sub-resource pool.
  • the two sub-resource pools are based on FDM.
  • Tx UEs that can transmit their own location are allowed to use the first sub-resource pool
  • Tx UEs that cannot transmit their own location are allowed to use the second sub-resource pool.
  • any UE can select a PSFCH resource for HARQ feedback.
  • the selection of PSFCH resources can be obtained based on the relationship with PSSCH (Physical Sidelink Shared Channel) and/or PSCCH (Physical Sidelink Control Channel, physical side link control channel). For example, it can be realized through the information in the SCI of the PSCCH or the preset method in the relationship with the PSCCH. Based on the information method in SCI, it can be realized in explicit or implicit way. The explicit way depends on the individual L1 control bit information, while the implicit way depends on the source ID or zone associated with each independent Tx UE. -ID, or use time slot and subchannel information, etc.
  • the Tx UE implements the transmission of data packets through the PSCCH and PSSCH multicast-related transport blocks (Transport Block, TB).
  • the SCI contains information about a subset of the PSFCH resource pool, which can be used as a resource for selecting HARQ feedback.
  • the Rx UE receives SCI and TB-related data packets, it detects whether there are errors in the data packets. Only when the Rx UE detects that there is an error in the received data packet, that is, the HARQ feedback method of Option-1 (Option-1) that has been agreed in the NR-V2X discussion is used to feed back NAK information.
  • Option-1 Option-1
  • the configuration information of the PSFCH resource pool and the SCI identification rules in PSCCH are as follows:
  • Bit is used to explicitly activate the selected PSFCH resource with index m, or implicitly activate the selected PSFCH resource with index m.
  • each Tx UE autonomously activates (or pre-configures) M E multiple PSFCH resources in a PSFCH resource pool containing M PSFCH resources through the SCI. If two or more Tx UE transmits data packets in the same time slot, by SCI, there will be two or more corresponding to the number M E PSFCH multiple resources are activated. Then, if a packet is received only the error, Rx UE to select one or more resources from the active M HARQ feedback for the E resource. This can reduce the possibility that the Rx UE selects the same PSFCH resource to feed back SCFI information including HARQ NAK for different Tx UEs. Select the number combination of M E elements from M elements can be expressed as follows:
  • the PSFCH resource pool can be regarded as the original PSFCH resource set. And all combinations of PSFCH resources selected and activated by the Tx UE from the original PSFCH resource set can be regarded as an extended PSFCH resource set. Extended PSFCH resource sets are dependent on (pre-) configuration parameters M E.
  • the original PSFCH resource set and the extended PSFCH resource set are transparent to each other and only need to rely on a predetermined mapping table or formula.
  • the PSFCH resources used for HARQ feedback will be (pre-)configured according to the following rules:
  • the total number of resources that is, the total number of elements in the resource set. among them,
  • Each PSFCH resource (pre-) configured with a PSFCH resource ID can be one of them.
  • the resource element can be defined as a resource based on a random sequence.
  • PSFCH Resource Subset limit the maximum number of sequence-based resources, such as, Under the premise that the maximum number of sequence-based resources is not exceeded, for each PSFCH resource subset, (pre)configure M E independent sequence resources, and the sequence resources must be selected from the (pre)configured PSFCH resource set R PSFCH . among them,
  • the PSFCH resource subset ID is used to activate the HARQ feedback resource in the SCI.
  • each sequence resource is (I) arranged separate PRB (Physical Resource Block) index (Index), OFDM symbol index, the cyclic shift (Cyclic Shift) index, to concentrate any configuration M E in each sub-resource PSFCH Sequence resources.
  • PRB Physical Resource Block
  • Index Physical Resource Block index
  • OFDM symbol index OFDM symbol index
  • Cyclic Shift Cyclic Shift index
  • SCI is used to transmit the PSFCH resource subset ID.
  • a simple way is to split the identification bit into the most significant bit (MSB, Most Significant Bit) and the least significant bit (LSB, Least Significant Bit).
  • MSB can be implicitly identified by source ID or zone-ID, time slot index, sub-channel, or a combination thereof related to Tx UE, while LSB can be explicitly identified by SCI. These parameters can be regarded as pseudo-random numbers to ensure a certain degree of randomness in resource activation.
  • the introduction of explicit identification bits is for the Tx UE to increase the randomness of resource activation in different time slots. In a typical example, LSB can be set to 1 bit, which means that previously and currently used resources can be randomly switched.
  • the subset And subset The intersection of may not be an empty set
  • the SCI sent from multiple Tx UEs can always be detected by the feedback UE. Therefore, all Rx UEs can know the subset of PSFCH resources activated by each Tx UE.
  • the following rules need to be followed: feedback the subset of resources from the Rx UE
  • the PSFCH resource R PSFCH (m) is obtained, but the PSFCH resource R PSFCH (m) is not included in the resource subset among them:
  • Each Tx UE detects multiple activated PSFCHs to determine whether a corresponding HARQ signal is sent. As long as the Tx UE detects more than one NAK in the activated PSFCH, the Tx UE must send data packets on the PSCCH again.
  • FIG 10 shows an example of three Tx UEs (Tx UE-1, Tx UE-2, Tx UE-3) sending three data packets in the same time slot.
  • SCI will activate two PSFCH resource elements for PSFCH, and activate The number of elements is (pre)configured. Among them, some elements overlap between subsets, and the three subsets are denoted as: among them:
  • the resources in are partially overlapped, namely
  • R PSFCH (1), R PSFCH (2), R PSFCH (3), R PSFCH (4), R PSFCH (5) represent 5 PSFCH resources.
  • the Tx UE will obtain the PSFCH resource more randomly.
  • the Rx UE-4 can transmit the ID of the resource subset through the detected SCI, so as to know all the activated PSFCH resource subsets. This provides Rx UE-4 with a higher random selection of PSFCH resources, and its corresponding HARQ feedback.
  • Rx UE-4 selects resources the following will happen:
  • Rx UE-4 receives a single error data packet from Tx UE-1, it selects some or all of the resources from the ⁇ R PSFCH (1), R PSFCH (2) ⁇ subset. Then send HAQR NAK information on the selected PSFCH resource;
  • Rx UE-4 receives error packets from Tx UE-1 and Tx UE-2 at the same time, it can select part from the ⁇ R PSFCH (1), R PSFCH (2), R PSFCH (3) ⁇ subset Or all resources. In this way, the selected PSFCH resource will not conflict with the PSFCH resource of Tx UE-3.
  • the selected PSFCH resource will not conflict with the PSFCH resource of Tx UE-3. So as to realize the HARQ NAK information transmission without conflict.
  • the selection of PSFCH resources is performed by the Rx UE itself;
  • Rx UE-4 receives error packets from all three Tx UEs at the same time, it can select resources from the ⁇ R PSFCH (1), R PSFCH (2),..., R PSFCH (5) ⁇ subset:
  • Rx UE-4 can select more PSFCH resources from the subset and obtain more transmission diversity gain.
  • the feedback UE should choose as many PSFCH resources as possible.
  • Rx UE-4 receives data packets from Tx UE-2 and Tx UE-3, and sends the same HARQ NAK on the PSFCH resources of R PSFCH (3), R PSFCH (4) and R PSFCH (5).
  • the reliability of NAK feedback for two Tx UEs can be greatly improved. This is because two feedback resources are allocated to each independent NAK feedback to obtain transmission diversity gain.
  • the PSFCH resources activated by the Tx UE should be kept as independent as possible without any correlation.
  • frequency domain is better than code domain or time domain.

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Abstract

本申请引入与资源ID和地理位置更新时间两个新的参数，用于避免在相关区域内的资源选择冲突。本申请还提供了MLZ情况下的资源选择方法；此外，为了避免PSFCH资源冲突，本申请每一个Tx UE通过SCI自动激活多个配置的PSFCH资源，改善HARQ反馈的可靠性。

Description

一种自主性信道资源选择方法 技术领域
本发明涉及一种通信方法，尤其涉及一种可避免信道资源选择冲突的信道资源选择方法。
背景技术
3GPP release-15标准发布之后，NR(New Radio)V2X(Vehicle to Everything)成为了重要的通信技术和研究课题。由于每个用户设备(UE，User Equipment)设备进行自主信道资源选择(以下信道资源简称为资源)，传输数据包之间难免出现冲突，这导致很差的稳定性；另外，车辆UE仅安装半双工系统，这意味着，一旦UE处于传送模式，则不能够接收，反之亦然。这明显降低了数据包的接收速度。
在LTE-V2X标准的5.10.13.2章节中，一个新的机制应用于V2X侧链路(sidelink)资源池的选择，该机制与区域标识(例如区域ID，Zone-ID)有关。其中，独立的资源或资源池和地理坐标相关连，被V2X sidelink通讯上层(予)配置。Tx UE(Transmitter UE)依赖于区域ID，只访问与Tx UE地理坐标相关的资源池，Tx UE利用其最后的地理坐标来实施资源池的选择。通过如下公式，Tx UE决定了Zone-ID：
Zone-ID＝y 1N x+x 1，
Figure PCTCN2019100272-appb-000001
其中，L为区域长度值，W为区域宽度值，N x为Zone-ID的经度，N y为Zone-ID纬度值，x和y分别为UE当前位置经度、纬度与参考坐标(0,0)之间的距离。x＝0,1,…,N x-1；y＝0,1,…,N y-1。
其中，L,W,N x和N y信息可以通过上层RRC来配置，或通过予配置方式来实现。在以下阐述中，(予)配置表示配置或予配置。
基于LTE-V2X标准说明，参数L、W、N x、N y或在Type-21或在Type-26系统信息块(System Information Block，SIB)中由RRC(Radio Resource Control，无线资源控制)配置，或者在SL-V2X-Preconfiguration系统中预配置。因此，需要N b个比特来标明构成 区域块(ZB，Zone Block)的N x·N y个Zone-ID，其中：
Figure PCTCN2019100272-appb-000002
Figure PCTCN2019100272-appb-000003
为上限函数(Ceiling Function)。
如图1所示，每一个ZB包括9个区域，每个区域由区域长度L和区域宽度W围成，每个ZB中区域的数量依赖于Zone-ID经度和纬度值。用ZB中x1、y1来表示的Zone-ID被经度和纬度围成，x1＝1,2,3，y＝1,2,3。图1中Zone-ID＝0、4、8的区域内分别有1、3和2个车辆。
在LTE-V2X中，通信数据包相对简单，只考虑周期数据包到达和发送，数据包大小也恒定。相反，在NR-V2X中，存在三种通信传输(Cast)类型：广播(Broadcast)、单播(Unicast)和组播(Groupcast)，数据包的到达可以是周期的也可以是非周期的，数据包大小可以是恒定也可以是不恒定的。在Groupcast，Tx UE通过Zone-ID或地理坐标发送并交换位置信息。Tx UE通过PSCCH信道(physical sidelink control channel，物理侧链路控制信道)发送SCI(Sidelink Control Indication)，相关组内的接收用户(Rx UE，Receive UE)检测SCI并获取Tx UE的Zone-ID，并获取与Tx UE的距离。
应该指明的，当用户(UE)在发送数据包时候，UE被定义为Tx UE，而在接受数据包时候，被定义为Rx UE。因此同样的用户在某时隙(Time slot)是Tx UE，而在某时隙是Rx UE。
上述技术中，至少有两个缺陷：
1)较低的资源利用。资源池是在每个区域(预)配置，不考虑Tx UE的利用率，因此，有些区域可能没有Tx UE来使用，导致专用资源的浪费。
2)每一个区域内Tx UE数量并不均衡，如果Tx UE数量大于资源池中可用资源的数量，很可能导致资源耗尽。因此，如果没有拥塞控制(Congestion Control)或弹性资源控制机制，则资源冲突就会发生。
发明内容
本申请所要解决的问题是：现有V2X sidelink资源池的选择技术中，资源利用率低、以及资源选择出现冲突。
为了解决上述问题，本申请提供了一种自主性信道资源选择方法。
本申请中的资源可以是PSSCH(Physical Sidelink Shared Channel),PSCCH(Physical Sidelink Control Channel)，也可以是PSFCH(Physical Sidelink Feedback  Channel)。
本申请所提供的第一种资源选择方法，其中，
划分出N个区域，N为自然数；第n区域内的区域ID为Zone-ID-n，n为选自0至N-1的自然数；为Tx UE设置的M个资源，每个资源表示为R n(m)，其中，m＝1,2,…M，M为Zone-ID-n内可用的所有资源数总和，且M≥Zone-ID-n内Tx UE数；
当至少两个Tx UE在同一区域Zone-ID-n的时间内，每一个Tx UE共享用户源L1 ID(User Source L1 ID)和LUT(位置更新时间，Location Update Timing)；其中，源L1 ID为Tx UE在PHY层的ID，Tx UE在PSCCH信道发送SCI给Rx UE，每一个Rx UE通过显式位置获取(explicit location acquisition)方式或隐式位置获取(implicit location acquisition)方式获得Tx UE源L1 ID和Tx UE位置信息、以及相关发送时间信息，每一个Rx UE储存所有Tx UE的LUT信息和Tx UE源L1 ID(以下Tx UE源L1 ID简称为源ID)。
基于Zone-ID-n内所有Tx UE使用的源ID和LUT，Zone-ID-n内所有Tx UE分别独立创建一个相同的表示Zone-ID-n的二维资源映射表(Resource Mapping Table，RMT)，记为RMT(n)，一旦Rx UE从Tx UE获得接收信息，RMT(n)同时更新；RMT(n)以源ID和LUT为两个维度；
根据RMT(n)，Zone-ID＝n的Tx UE自主选择资源发送数据包，所述资源选择方法的步骤包括：
——Tx UE自行选择资源；相同数量的资源将被相同数量的Tx UE选择；
——如果Tx UE源ID不同，基于源ID的渐进顺序，Tx UE各自选择资源。因此不同Tx UE选择的资源不会重复或冲突。
——如果相同源ID的Tx UE不止一个，则基于LUT递升次序，Tx UE各自选择资源。因此不同Tx UE选择的资源也不会重复或冲突；
——如果相同源ID和相同LUT的Tx UE不止一个，Tx UE则基于自检测规程(Sensing Procedure)来选择资源。
本申请所提供的第二种资源选择方法，其中，
划分出N个区域，N为自然数；第n区域内的区域ID为Zone-ID-n，n为选自0至N-1的自然数；为Tx UE设置的M个资源，每个资源表示为R n(m)，其中，m＝1,2,…,M，M为Zone-ID-n内可用的所有资源总和，M<Zone-ID-n内Tx UE数；
当至少两个Tx UE在同一个区域Zone-ID-n的时间内，每一个Tx UE共享源ID和LUT(位 置更新时间，Location Update Timing)；Tx UE用PSCCH信道发送SCI给Rx UE，每一个Rx UE获得Tx UE源ID和Tx UE的位置信息、以及通过显式位置获取(explicit location acquisition)或隐式位置获取(implicit location acquisition)得到相关时间，每一个Rx UE储存所有Tx UE的最新LUT的发送时间；
基于Zone-ID-n内所有Tx UE可用的源ID和LUT，Zone-ID-n内所有Tx UE分别独立创建一个相同的表示Zone-ID-n的二维资源映射表(Resource Mapping Table，RMT)，记为RMT(n)，一旦Rx UE从Tx UE获得接收信息，RMT(n)同时更新；
在用户通信范围内(Communicaiton Range)或ZB内，每一个Tx UE能够准确的检测PSCCH的SCI，并通过SCI能够获得相同区域以及其他区域内其他Tx UE的信息；
所述资源选择方法的步骤包括：
——如果Tx UE所处区域Zone-ID-n资源处于短缺状态，则判断其他区域是否有可用资源，如果有，则将其他区域的Zone-ID作为该Tx UE临时分配新的临时Zone-ID，获取原本分配给其他区域的资源；
——Tx UE自行选择资源；相同数量的资源将被相同数量的Tx UE选择；
——如果Tx UE源ID不同，基于源ID的渐进顺序，Tx UE各自选择资源，因此不同Tx UE选择的资源不会重复或冲突。
——如果相同源ID的Tx UE不止一个，则基于LUT递升次序，Tx UE各自选择资源，因此不同Tx UE选择的资源也不会重复或冲突；
——如果相同源ID和相同LUT的Tx UE不止一个，Tx UE则基于自检测规程(Sensing Procedure)来选择资源。
在一种优选实施例中，所述其他区域为相邻区域。
更优选地，如果Tx UE所处区域资源处于短缺状态，则判断其相邻区域资源是否可用，如果可用，则为该Tx UE临时分配新的Zone-ID作为临时Zone-ID，获取原本分配给相邻区域的资源。
更优选地，如果相邻区域资源处于短缺状态，则判断相邻区域的另一相邻区域的资源是否可用，如果可用，则为该Tx UE临时分配新的Zone-ID作为临时Zone-ID，获取原本分配给另一相邻区域的资源，直至找到具有可用资源的相邻区域为止，或在相邻区域超出用户通信范围内或ZB以外。
在一种优选实施例中，如果具有不止一个相邻区域，则按照直线方向、顺时针方向、逆 时针方向中的任意一种寻找相邻区域。
在一种优选实施例中，将该相邻区域的Zone-ID划归Zone-ID-n区域，作为临时Zone-ID。
在更优选实施例中，将该相邻区域的Zone-ID划归Zone-ID-n区域的同时，开始计时。
更优选地，每计时到一时间段，则停止使用并释放该Tx UE所用区域的资源。
更优选地，每计时到一时间段，则重新判断Zone-ID-n区域资源是否可用，如果可用，则停止使用并释放该Tx UE所用区域的资源，并开始使用Zone-ID-n区域资源。
更优选地，时间段可以说被(予)配置，也可以是通过L1信令来配置。
在一种优选实施例中，二维资源映射表中，将N个区域分为K层，N、K均分别独立地为自然数；第k层的Zone-ID为Zone-ID k，表示为(x k，y k)，
Figure PCTCN2019100272-appb-000004
Figure PCTCN2019100272-appb-000005
Figure PCTCN2019100272-appb-000006
Figure PCTCN2019100272-appb-000007
Figure PCTCN2019100272-appb-000008
k＝1,2,…,K,1≤i≤K-k,L k为区域长度值，W k为区域宽度值，
Figure PCTCN2019100272-appb-000009
为Zone-ID的经度，
Figure PCTCN2019100272-appb-000010
为Zone-ID纬度值，
Figure PCTCN2019100272-appb-000011
均为整数，是作为控制区域上下层的参数，且
Figure PCTCN2019100272-appb-000012
x k和y k分别为Tx UE当前位置经度、纬度与参考坐标(0,0)之间的距离；其中，K,Lk,Wk,
Figure PCTCN2019100272-appb-000013
信息可以通过上层RRC来配置，或通过予配置方式来实现。所述资源选择方法的步骤包括：
——根据不同Tx UE通信传输(Cast)类型，或不同Tx UE的QoS数据包，Tx UE被(予)配置在不同的区域层。第k层Tx UE检测所在层的ZB中潜在Tx UE数。如果第k层资源 数大于第k层中潜在Tx UE数，Tx UE选择自己层中的资源R。如果第k层资源数小于第k层中潜在Tx UE数，Tx UE选择原本分配给另一层的资源R；
——基于源ID的渐进顺序，分配资源R给第k层每一个ZB内的Tx UE，多重资源分配给每一个Zone-ID的多个Tx UE，但是Tx UE之间不存在差异；
——如果第k层多个Tx UE公用一个相同的Zone-ID，第k层每一个Zone-ID中的每一个Tx UE建立的RMT来区分资源；
———如果共享相同源ID的Tx UE不止一个，则基于LUT递升次序，划分资源给Tx UE；
———如果共享相同源ID和相同LUT的Tx UE不止一个，则基于自检测规程(Sensing Procedure)来划分资源给Tx UE。
在一种优选实施例中，第k+1层区域长度为L k+1，第k+1层区域宽度为W k+1，则
Figure PCTCN2019100272-appb-000014
第k层的
Figure PCTCN2019100272-appb-000015
个Zone-ID构成ZB，采用N k比特来表示，其中，
Figure PCTCN2019100272-appb-000016
在一种优选实施例中，第k+1层资源池配置为至少两种子资源池，能够向其他UE发送位置的Tx UE被允许进入第一子资源池，不能够向其他UE发送位置的Tx UE被允许进入第二子资源池。
在一种更优选实施例中，每一个区域均被配置所述至少两种子资源池。
在一种更优选实施例中，所述子资源池分为FDM(频分多路复用，Frequency Division Mutiplexing)基资源和TDM(时分多路复用，Time Division Multiplexing)基资源。
在一种优选实施例中，所述资源池为PSFCH(Physical Sidelink Feedback Channel)资源池R PSFCH，由R PSFCH(m)构成。PSFCH资源池(PSFCH Resource Set)有RRC配置或系统予配置。
在一种优选实施例中，每一个Tx UE通过SCI自主激活多个(至少两个)PSFCH资源或自主激活PSFCH资源子集(PSFCH Resource Subset)，作为HARQ反馈资源。
在一种优选实施例中，PSFCH资源池可以视为原始PSFCH资源集，而由Tx UE从原始PSFCH资源集中选择并激活的PSFCH资源的所有组合可被视为扩展PSFCH资源集，扩展PSFCH资源集是取决于(预)配置的参数M E，原始PSFCH资源集和扩展PSFCH资源集彼此都是透明的只需依赖于预先确定映射表或公式。具体的映射表或公式可以可以通 过上层RRC来配置，或通过予配置方式来实现。原始PSFCH资源集中的PSFCH资源被配置有相应的ID，扩展PSFCH资源集中PSFCH资源子集也被配置有相应的ID。
在一种优选实施例中，Tx UE通过PSSCH(Physical Sidelink Shared Channel)发送带有相关PSCCH(Physical Sidelink Control Channel)头的数据包，激活配置有相应的ID的PSFCH资源子集。
在一种优选实施例中，Rx UE从激活的资源子集中选择部分的PSFCH资源，并反馈含有HARQ NAK的SCFI(Sidelink Control Feedback Information)给相关Tx UE。
在一种优选实施例中，如果Rx UE从两个以上Tx UEs收到不同的数据包，Rx UE根据相关的PSCCHs的信息，从激活的PSFCH资源子集中选择部分的PSFCH资源从而使选择的PSFCH资源没有重复。并反馈HARQ(Hybrid Automatic Repeat Request，混合自动重传请求)NAK(negative acknowledgement，否定应答)给相关多个(至少两个)Tx UE。也就是Rx UE在不同Tx UE的SCI的信息中检测到被激活的PSFCH资源的子集中有相同的PSFCH资源，那么这些相同的PSFCH资源将不被作为HARQ NAK的资源使用。
在一种优选实施例中，Tx UE将会从针对组播多个Rx UE成员中接收相应的PSFCHs，检测是否有NAK反馈，只要Tx UE在其激活的PSFCH资源中检测到一个以上相应的NAK，Tx UE就进行其数据包重传。或者，通过组合所有PSFCH资源(非相干或相干组合)，Tx UE检测是否有NAK反馈。Tx UE在检测到在相关PSFCH上发送的相应NAK时进行其数据包重传。
在一种优选实施例中，用于NAK传输的PSFCH资源被定义具有恒定长度的随机序列(长度为Np)，Np长度随机序列映射到Np个连续的OFDM资源元素RE(Resource Element)上。例如，在LTE(Long-Term Evolution)系统中，Np＝12的随机序列被映射到到一个12资源元素的资源块(Resource Block，RB)。
另外，Np长度随机序列PSFCH资源的子集(或多个PSFCH资源)在时域和频域中相互交织。这样使一些PSFCH资源映射在不同的时域的OFDM符号(OFDM Symbol)上，一些PSFCH资源映射在不同的频域RB上。这里的PSFCH资源组成PSFCH资源池R PSFCH。由于OFDM符号对PSFCH资源受限的原因，一般只有1个OFDM符号可能被PSFCH资源所使用，频域中PSFCH资源交织可能更加有利。这需要PSFCH资源的频域间隔足够大，就能达到传输多极化的效果。反馈UE可以表现如下形式。
——如果Rx UE从两个以上Tx UEs收到不同的数据包，Rx UE根据相关的SCI的信息，从激活的PSFCH资源的子集选择部分的PSFCH资源从而使选择PSFCH资源没有重复。也就是Rx UE在不同的SCI的信息中检测到被激活的PSFCH资源的子集中有相同的PSFCH资源，那么这些相同的PSFCH资源将不被作为HARQ NAK的资源使用。
——Tx UE将会从针对组播多个Rx UE成员中接收相应的PSFCHs，检测是否有NAK反馈。只要Tx UE在其激活的PSFCH资源中检测到一个以上相应的NAK，Tx UE就进行其数据包重传。或者，通过组合所有PSFCH资源(非相干或相干组合)，Tx UE检测是否有NAK反馈。Tx UE在检测到在相关PSFCH上发送的相应NAK时进行其数据包重传。值得注意的是，对于两种接收备选方案，Tx UE是不需要知道Rx UE最后选择使用了哪些PSFCH资源来发送NAK信息的。
本发明上述内容中，优选地，源ID分为源L2 ID(MAC Layer-2 ID)和源L1 ID(Physical Layer-1 ID)，源L2 ID是Tx UE自分配，由V2X应用层提供给AS层；源L2 ID在MAC层分割为两个比特串，其中一个比特串为最低意义比特(LSB，Least Significant Bit)，作为sidelink控制源L1 ID发送给物理层；另一个比特串为最高意义比特(MSB，Most Significant Bit)，并置于MAC头中；在以上陈述中或以下陈述中，由SCI发送的源ID指的是源L1 ID，从LSB那里获得。
本发明上述内容中，优选地，源L2 ID为24比特。
本发明上述内容中，优选地，最低意义比特为8比特。
本发明上述内容中，优选地，最高意义比特为16比特。
本发明上述内容中，优选地，所述LUT为间隙更新时间。
本申请的有益效果：
本申请引入与资源ID和地理位置更新时间两个新的参数，用于避免在相关区域内的资源选择冲突。本申请还提供了MLZ情况下的资源选择方法；此外，为了避免PSFCH资源冲突，本申请每一个Tx UE通过SCI自动激活配置的PSFCH资源子集，改善HARQ反馈的可靠性。
附图说明
图1为基于位置Zone-ID的九个区域示意图；
图2为Tx UE所处Zone-ID-n示意图；
图3为RMT示意图；
图4为基于临时Zone-ID选择资源示意图；
图5为位于Zone-ID-n的Tx UE-i相关RMT示意图；
图6为K层区域示意图；
图7为双层区域中Tx UE-7和Rx UE-9距离示意图；
图8为双层区域资源选择示意图；
图9为双层区域内配置资源池示意图；
图10为三个Tx UE相同时隙内发送数据包，自动激活PSFCH资源示意图。
具体实施方式
V2X的应用中，地理位置信息是不可或缺的，而且可以用于进行资源选择，这要求Tx UE与通信范围内其他Tx UE共享位置信息，Tx UE位置一般采用有限比特量化的坐标来表示，量化的地理位置等同于Zone-ID。而Zone-ID可以和资源池被一起(予)配置，Tx UE根据自己的Zone-ID来访问相应的资源池。Tx UE的位置由SCI通过PSCCH信道发送，以改善通信范围内组播可靠性。考虑到从物理层可到达的距离范围，无线通信范围(Radio Communication Range，RCR)与每个IP包QoS(Quality of Service)表示的QoS通信范围(QoS Communication Range，QCR)是不同的。对于Tx UE获取其他Tx UE位置信息，有两个机制：
1)显式位置获取(Explicit Location Acquisition)：在NR-V2X组播通信中，通过PSCCH(Physical Sidelink Control Channel)传送的SCI，或者通过RRC的信息，Zone-ID可以被Rx UE显式获取。
——该机制仅用于组播交通中Tx UE，基于目前实施的NR-V2X，Tx UE位置信被息封装于SCI中；
——如果用SCI比特来表示位置的话，比特数不能太大，例如一般8-10比特。而如果用RRC比特来表示位置的话，就没有这种限制。
2)隐式位置获取(Implicit Location Acquisition)：基于Tx UE发送控制和数据信号、Rx UE通过实施PSCCH和PSSCH相关检测从而得到相关的资源池信息，而资源池和Zone-ID是直接相关的(一般是一对一的关系)。因此Rx UE可以隐式间接的获取Tx UE的Zone-ID。
——在该情况下，Tx UE的源ID，被封装于SCI通过PSCCH发送，Rx UE通过盲检PSCCH使用的资源池，识别Tx UE的源ID，并得到Tx UE的Zone-ID。
——更有效的方法是，把Zone-ID的表示比特分为MSB和LSB，PSSCH的资源池信息可以提供比较粗糙的由MSB表示的Zone-ID信息，而在每个PSSCH的资源中(如一个或几个子信道，Subchannel/Subchannels)的PSCCH资源信息可以提供比较精确的由LSB表示的Zone-ID信息。和NR的PUCCH(Physical Uplink Control Channel)一样，几个PSCCH资源组成PSCCH资源集(PSCCH Resoruce Set)，PSCCH资源位置可以在PSSCH资源中被(予)配置，而PSCCH资源集中每一个PSCCH资源位置可以和LSB表示的Zone-ID相关联，从而达到比较高精度的隐式位置的获取。
——该机制可用于单播和组播，基于目前实施的NR-V2X，Tx UE的源ID始终包含在SCI中。
如果区域的概念应用于通信系统中，则显式位置获取和隐式位置获取就不再有区别，这意味着，在单层区域中只需要一个获取机制。但是在双层区域多层区域的应用中，显式位置获取的Zone-ID和隐式位置获取的Zone-ID可以不同，能够被使用在不同的应用上。一般显式位置获取的Zone-ID区域比较小，而隐式位置获取的Zone-ID区域比较大，应用也可以不同。比如显式位置获取的Zone-ID可以用作用户的定位，而隐式位置获取的Zone-ID用作资源分配。在这种情况下，隐式位置获取方法可以帮助提高显式位置获取方法定位精度。双层或多层区域的情况，在本申请实施例3中给出。
为此，在单层区域中假设地理位置信息在两个Tx UE之间始终已知，除非半双工问题存在于两个Tx UE之间。半双工意味着一旦UE处于传输模式，就不能够接收；同样UE处于接收模式，就不能够传输。因为半双工系统在双向通信中，每次仅有一个方向可以实施(而不是同时)。
上面提出的方案，主要基于通过位置信息，NR-V2X中的mode-2自动资源选择被实施，但是在多个Tx UE共用相同Zone-ID的情况下，冲突仍然出现，因此，需要考虑其他机制以区分资源选择中的多个Tx UE。
本申请中引入两个新的参数：源ID和地理位置更新时间(LUT)，这在两个Tx UE之间是已知的，并可以用来避免资源选择冲突。
——源ID：源ID可以分为源L2 ID(MAC Layer-2)和源L1 ID(Physical Layer-1)，源L2 ID由Tx UE自分配，并被V2X层提供给接入(Access Stratum，AS)层，源L2 ID长度24比特，在MAC层分为两个比特串，第一个比特串为最低意义比特(LSB)部分(8比特)，作为sidelink控制源L1 ID发送给物理层；第二个比特串为最高意义比特(MSB) 部分(16比特)，并置于MAC头中。
——在NR V2X中，单播或组播情况下，源L1 ID从Tx UE通过SCI由PSCCH发送，可以认为，UE能够知道来自Tx UE的源L1 ID；
——因为有限的表达比特(一般8个比特)，对于多个Tx UE共用相同源L1 ID是有可能发生的。
——LUT：LUT是位置更新时间，在这时间点上，Tx UE通过PSCCH发送SCI给Rx UE，每个Rx UE获取Tx UE的位置信息以及相关更新时间并储存LUT。Rx UE可以通过显式位置获取或隐式位置获取方法获取位置信息；被储存的LUT在Rx UE选择资源时使用。
——在NR-V2X组播通信中，Tx UE通过PSCCH发送携带封装于SCI中的源ID的位置信息，每一个UE显式的知道其他UE的LUT的位置信息；但是，在单播交通中，Tx UE不发送位置信息，而是通过PSCCH发送SCI中的源ID，因此，每个UE隐式的知道其他UE带有LUT的位置信息；
——对于多个Tx UE在同一个时隙发送数据包，导致相同的源ID和LUT是有可能发生的。这种情况下，不同的Tx UE会选择的同样资源。另外，半双工问题可能会出现，半双工问题的解决在实施例4中；
——LUT应当根据初始传送时间进行更新，因为无论数据包什么时候被成功解码，只有这个时间对于所有Rx UE是相同的。
图2展示了第n个Zone-ID，其中，Tx UE-1和Tx UE-2位于Zone-ID-n区域，这种情况下，如果采用基于LTE-V2X的自发资源选择机制，资源冲突可能发生。因此两个Tx UE之间可用的源ID和LUT，作为辅助信息，来避免源资冲突。
实施例1
本实施例中，资源数大于等于区域内的Tx UE数。Tx UE不需要担心在区域有多少资源可用，Tx UE仅需要避免每个Tx UE自发选择资源时的资源冲突。对于Tx UE，必要的条件是知道同一Zone-ID相关的其他UE的信息，充分条件是，知道源ID和LUT作为辅助信息，用于区分相同区域的资源。
假设：
——Tx UE位于第n区域，记为Zone-ID-n，例如，第0区域记为Zone-ID-0，第1区域Zone-ID-1，……，第N-1区域Zone-ID-(N-1)；
——Tx UE在相同区域的时候，每个Tx UE的源ID和LUT是共享的；
——配置给Tx UE的资源(如子信道，Sub-Channels)记为R n(m)，其中m＝1,2,…,M，M为Zone-ID-n可用资源总数，大于或等于Zone-ID-n内Tx UE数；
基于可用于Zone-ID-n内所有Tx UE的源ID和LUT信息，所有Tx UE可以分别创建二维资源映射表(RMT)，与Zone-ID-n相关的记为RMT(n)。一旦Rx UE接收来自Tx UE的信息，RMT需要同时更新。基于Zone-ID和RMT，每个Tx UE可以自发选择资源，而避免区域内的任意冲突。资源选择遵循如下规则：首先按照源ID方向，然后按照LUT方向。
参照图3，8个Tx UE位于Zone-ID-n中，在RMT中基于共享的源ID和LUT信息绘制，每个Tx UE的资源选择采用如下步骤：
步骤1，基于源ID的渐进顺序，自发分配资源给Tx UE，相同数量的资源划分给共享相同源ID的相同数量的Tx UE；例如，图3中Tx UE-2、Tx UE-3和Tx UE-7仅根据源ID-1、ID-3、ID-7就可以独立选择资源。两个资源配置给两个共用源ID-2的Tx UE，三个资源配置给三个共用源ID-5的Tx UE；
步骤2，如果共享相同源ID的Tx UE不止一个，则基于LUT递升次序，划分资源给Tx UE；例如图3，三个Tx UE共用源ID-5，三个资源从按照LUT-1、LUT-3、LUT-4的顺序分别配置给Tx UE-1、Tx UE-4和Tx UE-8；
步骤3，如果共享相同源ID和相同LUT的Tx UE不止一个，则基于自检测规程(Sensing Procedure)来自发分配资源给Tx UE。
实施例2
本实施例中，资源数小于区域内的Tx UE数。Tx UE不仅仅要避免资源冲突，还需要关注所在区域资源耗尽的可能。本实施例提出了资源耗尽的解决方案，基于相邻区域的配合。
每个Tx UE知道同一区域内以及第一级相邻区域内的相关Tx UE信息(图4中深色部分)，然后还知道第二级相邻区域的Tx UE信息(图4中浅色部分)，这些区域都在通信范围内。如果Tx UE位于Zone-ID-n，在第一级的相邻的Zone-ID顺时针方向成环形，记为：
Zone-ID-(n-1)、Zone-ID-(n-1+N x)、Zone-ID-(n+N x)、Zone-ID-(n+1+N x)
Zone-ID-(n+1)、Zone-ID-(n+1-N x)、Zone-ID-(n-N x)、Zone-ID-(n-1-N x)
类似的，第二级的Zone-ID也可以在第一级外顺时针方向环形设置。
如果区域内出现资源短缺，在实施例1选择资源步骤1之前，需要给Tx UE临时分配新的Zone-ID，帮助Tx UE获取原本配置给相邻区域的资源，为此，本申请引入临时Zone-ID，此时，Zone-ID重新映射基于如下资源寻找过程：
——Tx UE位于Zone-ID-n，沿图4中顺时针方向，寻找配置给第一级相邻区域的资源，从Zone-ID-(n-1)直至Zone-ID-(n-1-N x)；相邻区域的可用资源被定义为临时使用的资源，而这些资源被临时映射到临时Zone-ID上；
——如果Zone-ID-n的Tx UE在第一级相邻区域没有发现可用资源，则继续寻找配置给第二级相邻区域的资源，沿图4中顺时针方向，从Zone-ID-(n-2-N x)直至Zone-ID-(n-2-2N x)；——持续寻找操作直至在相邻区域找到可用资源，或者寻找的相邻区域已经超出通信范围；在通信范围内，诸如Tx UE的Zone-ID以及相关RMT等信息是能够显式或隐式相互交换的；
——将含有可用资源的相邻Zone-ID(包聒被映射的资源)临时划入Tx UE所在的Zone-ID-n，作为资源选择的临时Zone-ID，开始计时以控制资源使用时间；
——如果本区域资源短缺状态消除，或者资源使用超时，则释放临时Zone-ID的资源。
本实施例中，一旦临时Zone-ID被Tx UE确定，Tx UE采用相同的机制进行资源选择，如实施例1所述的。例如图4，Tx UE-i位于Zone-ID-n，面临资源缺少的情况，然后发现在Zone-ID-(n-1)有可用资源，Tx UE-i将Zone-ID-(n-1)作为临时Zone-ID，并从RMT-(n-1)中选择与Zone-ID-(n-1)相关的资源。
图5给出了关于位于Zone-ID-n的Tx UE-i的RMT，在通信范围内，RMT的数量对于Tx UE-i是可以获得的，所有UE能够与Tx UE-i进行信息交换，当然其他UE也能够知晓其他Tx UE的RMT，因此隐式知晓哪些资源被Tx UE-i选择，从而避免通信范围内的资源冲突。
实施例1和实施例2介绍的是单层区域(Single Layer Zone，SLZ)中新引入参数在自动资源选择过程中的重要性，但是，在限制比特数的情况下，Zone-ID的精度将会受到影响。比如要比较高精度的Zone-ID，重复使用的区域范围将会减小。反之，要扩大区域范围，Zone-ID的指示精度将会变差。因此，Zone-ID的指示精度和重复使用的区域范围不能够同时相顾。
实施例3
本申请还提供了多层区域(Multi-Layer Zone，MLZ)的情况，能够解决SLZ存在的问题，MLZ是区域层叠于多个层次，每一层由LTE V2X定义的地理区域构成，并分别构建。图6给出了K层的情况，其中，画出两层，即k层和k+1层，第k层区域表述为上层区域或子区域，第k+1层区域表述为下层区域或母区域。
Zone-ID k定义为第k层的Zone-ID，用(x k，y k)表示，数学表达公式如下：
Figure PCTCN2019100272-appb-000017
Figure PCTCN2019100272-appb-000018
Figure PCTCN2019100272-appb-000019
Figure PCTCN2019100272-appb-000020
Figure PCTCN2019100272-appb-000021
其中，k＝1,2,…,K，1≤i≤K-k；L k为区域长度值，W k为区域宽度值，
Figure PCTCN2019100272-appb-000022
为Zone-ID的经度，
Figure PCTCN2019100272-appb-000023
为Zone-ID纬度值，
Figure PCTCN2019100272-appb-000024
均为整数，是作为控制区域上下层的参数，且
Figure PCTCN2019100272-appb-000025
在图6中，
Figure PCTCN2019100272-appb-000026
上层区域与下层区域之间的子关系如下：
Figure PCTCN2019100272-appb-000027
第k层的
Figure PCTCN2019100272-appb-000028
个Zone-ID构成ZB，采用N k比特来表示，其中，
Figure PCTCN2019100272-appb-000029
图6中，
Figure PCTCN2019100272-appb-000030
每个ZB含有16个Zone-ID，需要4比特来表达区域。
以K＝2为例，表示双层区域，第一层和第二层的Zone-ID表示为：
Figure PCTCN2019100272-appb-000031
Figure PCTCN2019100272-appb-000032
双层Zone-ID可以转化为SLZ的Zone-ID(记为Zone-ID (SLZ))，方式为：
Figure PCTCN2019100272-appb-000033
Figure PCTCN2019100272-appb-000034
Figure PCTCN2019100272-appb-000035
在带宽28GHz的私人无线电系统(也称为区域5G)的应用中，基于MLZ的定位方案可以有效的避免不同个体经营宽带无线接入(Broadband Wireless Accesses，BWA)之间的资源冲突。
现行NR-V2X中，Tx UE位置信息封装于SCI，通过PSCCH传输，以改善通信范围内的组播性能，位置信息一般用带有有限比特的地理Zone-ID表示，因此，如果我们希望覆盖大的通信区域，区域尺寸就要大，导致定位准确性较差，本实施例引入MLZ，可以解决该问题。
参照图7，假设：
Figure PCTCN2019100272-appb-000036
我们以双层区域为例，我们获得Tx UE-7和Tx UE-9之间的距离。在第一层，每一个ZB含有16个区域，涉及16个Zone-ID；在第二层，每个ZB含有4个区域，涉及4个Zone-ID，单个资源池是独立配置给第二层的每一个Zone-ID。
单层的情况下，比如仅有第一层，ZB之间的Zone-ID有重复，增加了Tx UE定位的不确定性，例如，如果Tx UE位于第一层Zone-ID 1＝7，发送其Zone-ID给位于同一层的Zone-ID 1＝9的Rx UE，因为至少有四个位置关乎相同的Zone-ID 1＝7，Rx UE不能准确识别自己ZB以外的Tx UE的位置。
但是在双层区域，一旦Tx UE在PSCCH由SCI发送第一层的Zone-ID，Rx UE能够检测SCI并获得如下信息：Tx UE在第一层的Zone-ID作为显式信息、Tx UE在第二层的Zone-ID作为隐式信息。隐式信息在Tx UE和Rx UE之间传输，需要被Rx UE基于所用资源池来获得。使用相同的例子，Tx UE位于第一层Zone-ID 1＝7，所用资源池在Zone-ID 2，Rx UE位于Zone-ID 1＝9，(a1,b1)表示Zone-ID，可以确定Tx UE在哪里，例如：
Figure PCTCN2019100272-appb-000037
这解决了Tx UE的Zone-ID的不确定性问题，如果Tx UE超出图中所画区域，可以增加第二层Zone-ID经度和纬度值来解决，而第二层Zone-ID是被上层(予)配置的，不会增加信令开销。因此达到同样的定位精度，本例SCI中含有的表述比特数从6bits降低至4bits。
参照图8，本实施例采用双层区域，第一层和第二层的每个ZB均为4×4区域。第一 层Zone-ID记为Zone-ID 1，第二层Zone-ID记为Zone-ID 2，基于源ID和LUT作为位置Zone-ID的辅助信息的资源选择，可以参照实施例1。
在第二层区域内，每一个区域独立配置资源，或根据TDM或根据FDM方式，由于参数
Figure PCTCN2019100272-appb-000038
在第二层中的
Figure PCTCN2019100272-appb-000039
独立资源，被映射在第一层ZB之上。图8中，
Figure PCTCN2019100272-appb-000040
标记为0、1、4和5的Zone-ID 2中配置的资源，映射在标记为0、1、…、15的Zone-ID 1的ZB之上，第一层ZB限制在物理通信范围，该范围内UE能够在PSCCH中通过SCI显式/隐式交换信息，例如Zone-ID、源ID和LUT。
在混合信息通信应用中，组播通信的Tx UE选择第一层Zone-ID 1相关资源，而单播和广播Tx UE选择第二层Zone-ID 2相关资源。在单播、组播和广播中，资源选择是独立的过程，如上述实施例中所述，Tx UE的Zone-ID 1可以基于SCI被Rx UE显式获得，而Tx UE的Zone-ID 2基于Tx UE所用资源池可以被Rx UE显式获得。
假设第一层每个区域的每一个Tx UE能够知道相同层相同ZB内其他Tx UE的信息，那么每一个Tx UE可以创建与ZB相关的二维RMT，二维RMT含有Zone-ID 1、源ID和LUT，将RMT表达为Zone-ID 1＝n的RMT 1(n)，。
RMT 1(n)对于第一层ZB内的所有Tx UE是可相互获得的，相同资源池的资源选择如下：——Tx UE获得第一层ZB内Tx UE潜在数量，可能选择配置在第二层的资源，记为R Zone-ID2(m)；图8中，m为资源池中的资源索引，m＝1,2,…,M，M为配置给第一层ZB的资源数；——按照递升顺序。配置R Zone-ID2(m)给第一层每一个ZB内的Tx UE；多个资源分配给每个Zone-ID内多个Tx UE，但是Tx UE之间没有差异；
——每个Zone-ID 1的Tx UE创建自己的RMT。如果多个Tx UE涉及同一个Zone-ID 1，RMT用于区分资源；资源选择依赖于二维RMT，采用实施例1相同的方式，即：先在源ID方向，然后在LUT方向。
实际上，由于半双工(half-duplex)的限制，不同Tx UE可能出现相同的LUT，因此，解决半双工问题也就是消除资源选择的不确定性。参照图9，在第二层，资源池被配置为基于FDM的资源和基于TDM的资源。4个频率资源池被(予)配置，每一个频率资源池含8个子信道(sub-channel，SCH)，每个SCH由多个资源块(resource block，RB)构成，资源池内的子信道分成4个第一基于TDM的子信道作为第一子资源池，和4个第二基于TDM的子信道作为第二子资源池。两种子资源池基于FDM。为了避免半双工的影响，能够发送自身位置的Tx UE被允许使用第一子资源池，而不能够发送自身位置的Tx UE被允许 使用第二子资源池。
实施例4
在PSFCH(Physical Sidelink Feedback Channel，物理侧链路反馈信道)资源池中，任意UE可以选择PSFCH资源来进行HARQ反馈。PSFCH资源的选择可以根据和PSSCH(Physical Sidelink Shared Channel，物理侧链路共享信道)和/或PSCCH(Physical Sidelink Control Channel，物理侧链路控制信道)关系获得。比如通过PSCCH的SCI中的信息，或者和PSCCH关系上的预设置方法来实现。基于SCI中的信息方法，可以通过显式或隐式方式来实现，显式的方式依赖于单独的L1控制比特信息，而隐式的方式依赖于与每个独立Tx UE相关的源ID或Zone-ID，或使用时隙和子信道信息等。
Tx UE通过PSCCH和PSSCH组播相关传输块(Transport Block，TB)来实现数据包的传输。而SCI中含有携带PSFCH资源池子集信息，可以用作选择HARQ反馈的资源。Rx UE接收SCI以及TB相关数据包后，检测数据包是否存在错误。仅仅在Rx UE检测接收数据包存在错误的情况下，也就是说用在NR-V2X讨论中已经同意的选项-1(Option-1)的HARQ反馈方式，反馈NAK信息。PSFCH资源池的配置信息以及PSCCH中SCI标识规则如下：
——配置：PSFCH资源池配置为资源集R PSFCH，包含元素R PSFCH(m)，m＝1,2,…,M，M为PSFCH资源池中的资源总数，即资源集中元素总数。
——SCI中比特标识：
Figure PCTCN2019100272-appb-000041
比特用于显式激活所选择的带有索引m的PSFCH资源，或隐式激活所选择的带有索引m的PSFCH资源。
如果两个以上Tx UE在同一时隙发送数据包，并且自发激活相同的PSFCH资源来进行HARQ反馈，可能会发生资源冲突。基于区域的资源池的情况下，相同的问题也会发生。因为在相同的区域，可能相同的资源被自主激活。
为了解决该问题，本实施例引入多重PSFCH激活方案。其中，每一个Tx UE通过SCI，在含有M个PSFCH资源的PSFCH资源池中，自主激活(或予配置)M E个多重PSFCH资源。如果两个以上Tx UE在同一时隙发送数据包，通过SCI，将有两个以上相对应的M E个多重PSFCH资源被激活。然后，如果只收到的一个数据包是错误的，Rx UE从激活的用于HARQ反馈的M E个资源中选择一个或多个资源。这可以降低Rx UE选择相同PSFCH资源为不同的Tx UE反馈包含HARQ NAK的SCFI信息的可能性。从M个元素中选择M E个元素的数字组合可以表示如下：
Figure PCTCN2019100272-appb-000042
相比于M E＝1，M E＞1时冲突的可能性将被降低
Figure PCTCN2019100272-appb-000043
倍，但将会这耗费更多的控制信令比特。例如M＝8，M E＝3，完全冲突可能性可以降低7倍，但是控制信令比特必须从3比特增加至6比特。
PSFCH资源池可以视为原始PSFCH资源集。而由Tx UE从原始PSFCH资源集中选择并激活的PSFCH资源的所有组合可被视为扩展PSFCH资源集。扩展PSFCH资源集是取决于(预)配置的参数M E。原始PSFCH资源集和扩展PSFCH资源集彼此都是透明的只需依赖于预先确定映射表或公式。
用作HARQ反馈的PSFCH资源将以如下规则(予)配置：
——对PSFCH资源池，限定最大PSFCH资源总数，
Figure PCTCN2019100272-appb-000044
如，
Figure PCTCN2019100272-appb-000045
在不超过最大PSFCH资源总数的前提下，(予)配置PSFCH资源池为资源集R PSFCH，包含资源元素R PSFCH(m)，m＝1,2,…,M，M为PSFCH资源池中的资源总数，即资源集中元素总数。其中，
Figure PCTCN2019100272-appb-000046
———每个PSFCH资源(预)配置有PSFCH资源ID，ID可以为
Figure PCTCN2019100272-appb-000047
其中的一个。
———资源元素可以被定义为基于随机序列的资源。
——对PSFCH资源池，限定最大OFDM符号(OFDM Symbol)数，
Figure PCTCN2019100272-appb-000048
如，
Figure PCTCN2019100272-appb-000049
在不超过最大OFDM符号数的前提下，(予)配置用于PSFCH资源池的符号数，MS。其中，
Figure PCTCN2019100272-appb-000050
——对PSFCH资源子集(PSFCH Resource Subset)，限定最大基于序列的资源数，
Figure PCTCN2019100272-appb-000051
如，
Figure PCTCN2019100272-appb-000052
在不超过最大基于序列资源数的前提下，针对在每个PSFCH资源子集，(予)配置M E个独立的序列资源，而序列资源必须在(予)配置的PSFCH资源集R PSFCH中选择。其中，
Figure PCTCN2019100272-appb-000053
———每个PSFCH资源子集(预)配置有PSFCH资源子集ID。PSFCH资源子集ID被用作在SCI中激活HARQ反馈资源。
——每个序列资源被(予)配置有独立的PRB(Physical Resource Block)索引(Index)，OFDM符号索引，循环移位(Cyclic Shift)索引，以便在每个PSFCH资源子集中任意配置M E个序列资源。
为了降低控制信令，用SCI传送PSFCH资源子集ID。一个简单的方式是将标识比特拆分为最高意义比特(MSB，Most Significant Bit)和最低意义比特(LSB，Least Significant Bit)。MSB可以采用与Tx UE相关的源ID或Zone-ID、时隙指数、子信道或其组合来隐式标识，而LSB可以采用SCI显式标识。这些参数可以看做伪随机数，从而确保资源激活有一定的随机性。引入显式标识比特，是为了Tx UE在不同时隙增加资源激活的随机性。典型例子中，LSB可以设置为1比特，意味着之前和当前使用资源可以随机切换使用。
假设：
——Tx UE-i通过PSSCH发送带有PSCCH头的数据包，激活PSFCH资源中含有M E个元素的子集
Figure PCTCN2019100272-appb-000054
进行HARQ反馈，其中，i＝1,2,…,I，I为当前时隙内Tx UE总数，
Figure PCTCN2019100272-appb-000055
——Rx UE从带有索引i＝1,2,…,I E的IE个Tx UE接收到I E个错误的数据包，而Rx UE从带有索引i＝I E+1,I E+2,L,I的(I-I E)个Tx UE成功接收到(I-I E)个数据包。因此Rx UE通过对PSCCH的检测，从Tx UE激活的资源子集中获得PSFCH资源，反馈IE个HARQ NAK给相关的IE个Tx UE。
应当注意的是，由于允许多个Tx UE激活部分重叠的PSFCH资源，子集
Figure PCTCN2019100272-appb-000056
与子集
Figure PCTCN2019100272-appb-000057
的交集可以不为空集
Figure PCTCN2019100272-appb-000058
Figure PCTCN2019100272-appb-000059
另外，从多个Tx UE发送的SCI始终能够被反馈UE检测到，因此，所有Rx UE能够知道每个Tx UE激活的PSFCH资源子集。
根据Rx UE反馈的PSFCH资源选择过程是Rx UE执行的，需要遵循如下规则：反馈Rx UE从资源子集
Figure PCTCN2019100272-appb-000060
获得PSFCH资源R PSFCH(m)，但获得的PSFCH资源R PSFCH(m)不包聒在资源子集
Figure PCTCN2019100272-appb-000061
其中：
Figure PCTCN2019100272-appb-000062
Figure PCTCN2019100272-appb-000063
Figure PCTCN2019100272-appb-000064
每一个Tx UE通过对多个激活的PSFCH检测，判断是否有相应的HARQ信号被发出。Tx UE只要在激活的PSFCH中检测到一个以上的NAK，Tx UE就必须重新在PSCCH发送数据包。
图10给出了三个Tx UE(Tx UE-1、Tx UE-2、Tx UE-3)在同一时隙发送三个数据包的例子，SCI将为PSFCH激活两个PSFCH资源元素，而激活的元素数是(予)配置的。其中，有些元素在子集之间有重叠，三个子集记为：
Figure PCTCN2019100272-appb-000065
其中：
Figure PCTCN2019100272-appb-000066
Figure PCTCN2019100272-appb-000067
Figure PCTCN2019100272-appb-000068
Figure PCTCN2019100272-appb-000069
中的资源是部分重叠的，即
Figure PCTCN2019100272-appb-000070
R PSFCH(1),R PSFCH(2),R PSFCH(3),R PSFCH(4),R PSFCH(5)代表5个PSFCH资源。
实际上，由于自发选择资源，Tx UE会更随机的获得PSFCH资源，另外，Rx UE-4可通过检测的SCI传送资源子集的ID，从而知晓所有激活的PSFCH资源子集。这为Rx UE-4提供了对PSFCH资源更高随机性的选择，为其相应的HARQ反馈。Rx UE-4选择资源时会发生如下情况：
——如果Rx UE-4从Tx UE-1接收到的单个错误数据包，其从{R PSFCH(1),R PSFCH(2)}子集中选择部分或全部的资源。然后在选择PSFCH资源上发送HAQR NAK信息；
——如果Rx UE-4从Tx UE-1、Tx UE-2同时接收到错误数据包，其能够从{R PSFCH(1),R PSFCH(2),R PSFCH(3)}子集中选择部分或全部的资源。这样被选择的PSFCH资源不会和Tx UE-3的PSFCH资源相冲突。
———比方说，只选择R PSFCH(1)资源，或者选择R PSFCH(1)与R PSFCH(2)资源，或全部资源。被选择的PSFCH资源不会和Tx UE-3的PSFCH资源发生冲突。从而实现无冲突的HARQ NAK信息发送。PSFCH资源的选择是由Rx UE自己执行；
———选择两个以上资源来发送相同的HARQ NAK的好处是，提供传输分集增益；
——如果Rx UE-4从所有三个Tx UE同时接收到错误数据包，其能够从{R PSFCH(1),R PSFCH(2),…,R PSFCH(5)}子集中选择资源：
———Rx UE-4可以从子集中选择更多PSFCH资源，并获得更多传输分集增益。
考虑到传输分集，反馈UE应当尽可能选择更多的PSFCH资源。例如Rx UE-4从Tx UE-2和Tx UE-3接受数据包，其在R PSFCH(3),R PSFCH(4)和R PSFCH(5)的PSFCH资源上发送相同的HARQ NAK。针对两个Tx UE的NAK反馈可靠性可以获得大幅改善。这是因为两个反馈资源配置给每一个独立的NAK反馈，将获得传输分集增益。
为了获得传输分集增益最大化，Tx UE激活的PSFCH资源应当保持尽可能独立，不带有任何相关。例如在频域要比码域或时域更好。多重PSFCH激活方案的好处是：
——激活PSFCH资源冲突的可能性被明显减小，以便降低基于HARQ重新发送的必要性；
——传输分集增益可以获得，以便改善HARQ反馈信道的可靠性。
以上对本发明的具体实施例进行了详细描述，但其只是作为范例，本发明并不限制于以上描述的具体实施例。对于本领域技术人员而言，任何对本发明进行的等同修改和替代也都在本发明的范畴之中。因此，在不脱离本发明的精神和范围下所作的均等变换和修改，都应涵盖在本发明的范围内。

Claims (18)

  1. 一种自主性信道资源选择方法，其特征在于，
    划分出N个区域，N为自然数；第n区域内的区域ID为Zone-ID-n，n为选自0至N-1的自然数；为Tx UE设置的M个资源，每个资源表示为R n(m)，其中，m＝1,2,…M，M为Zone-ID-n内可用的所有资源数总和；
    当至少两个Tx UE在同一个区域Zone-ID-n的时间内，每一个Tx UE共享用户源ID和LUT；
    其中，源ID是Tx UE的ID；Tx UE在PSCCH信道发送SCI给Rx UE，每一个Rx UE通过显式位置获取方式或隐式位置获取方式获得Tx UE源ID和Tx UE位置信息、以及相关发送时间信息，每一个Rx UE储存所有Tx UE的LUT信息和Tx UE源ID；
    基于Zone-ID-n内所有Tx UE使用的源ID和LUT，Zone-ID-n内所有Tx UE分别独立创建一个相同的表示Zone-ID-n的二维资源映射表，记为RMT(n)，一旦Rx UE从Tx UE获得接收信息，RMT(n)同时更新；RMT(n)以源ID和LUT为两个维度；
    根据RMT(n)，Zone-ID＝n的Tx UE自主选择资源发送数据包，
    所述资源选择方法的步骤包括：
    当M≥Zone-ID-n内Tx UE数时，
    ——Tx UE自行选择资源；相同数量的资源将被相同数量的Tx UE选择；
    ——如果Tx UE源ID不同，基于源ID的渐进顺序，Tx UE各自选择资源，因此不同Tx UE选择的资源不会重复或冲突；
    ——如果相同源ID的Tx UE不止一个，则基于LUT递升次序，Tx UE各自选择资源，因此不同Tx UE选择的资源也不会重复或冲突；
    ——如果相同源ID和相同LUT的Tx UE不止一个，Tx UE则基于自检测规程来选择资源。
  2. 根据权利要求1所述的资源选择方法，其特征在于，在用户通信范围内或ZB内，每一个Tx UE通过检测PSCCH的SCI能够获得相同区域以及其他区域内其他Tx UE的信息；
    当M＜Zone-ID-n内Tx UE数时，在“基于源ID的渐进顺序，分配资源给Tx UE”之前，所述资源选择方法的步骤还包括：
    ——如果Tx UE所处区域Zone-ID-n资源处于短缺状态，则判断其他区域是否有可用资源，如果有，则将其他区域的Zone-ID作为该Tx UE临时分配新的临时Zone-ID，获取原本分配给其他区域的资源。
  3. 根据权利要求2所述的资源选择方法，其特征在于，如果Tx UE所处区域资源处于短缺 状态，则判断其相邻区域资源是否可用，如果可用，则为该Tx UE临时分配新的Zone-ID作为临时Zone-ID，获取原本分配给相邻区域的资源。
  4. 根据权利要求3所述的资源选择方法，其特征在于，如果相邻区域资源处于短缺状态，则判断相邻区域的另一相邻区域的资源是否可用，如果可用，则为该Tx UE临时分配新的Zone-ID作为临时Zone-ID，获取原本分配给另一相邻区域的资源，直至找到具有可用资源的相邻区域为止，或在相邻区域超出用户通信范围内或ZB以外。
  5. 根据权利要求2所述的资源选择方法，其特征在于，将该相邻区域的Zone-ID划归Zone-ID-n区域，作为临时Zone-ID。
  6. 根据权利要求5所述的资源选择方法，其特征在于，将该相邻区域的Zone-ID划归Zone-ID-n区域的同时，开始计时。
  7. 根据权利要求6所述的资源选择方法，其特征在于，每计时到一时间段，则停止使用并释放该Tx UE所用区域的资源。
  8. 根据权利要求6所述的资源选择方法，其特征在于，每计时到一时间段，则重新判断Zone-ID-n区域资源是否可用，如果可用，则停止使用并释放该Tx UE所用区域的资源，并开始使用Zone-ID-n区域资源。
  9. 根据权利要求1所述的资源选择方法，其特征在于，所述二维资源映射表中，将N个区域分为K层，N、K均分布独立的为自然数；第k层的Zone-ID为Zone-ID k，表示为(x k，y k)，
    Figure PCTCN2019100272-appb-100001
    Figure PCTCN2019100272-appb-100002
    Figure PCTCN2019100272-appb-100003
    Figure PCTCN2019100272-appb-100004
    Figure PCTCN2019100272-appb-100005
    k＝1,2,…,K,1≤i≤K-k,L k为区域长度值，W k为区域宽度值，
    Figure PCTCN2019100272-appb-100006
    为Zone-ID的经度，
    Figure PCTCN2019100272-appb-100007
    为Zone-ID纬度值，
    Figure PCTCN2019100272-appb-100008
    均为整数，是作为控制区域上下层的参数，且
    Figure PCTCN2019100272-appb-100009
    x k和y k分别为Tx UE当前位置经度、纬度与参考坐标(0,0)之间的距离；
    其中，K,L k,W k,
    Figure PCTCN2019100272-appb-100010
    信息可以通过上层RRC来配置，或通过予配置方式来实现；
    所述资源选择方法的步骤包括：
    ——根据不同Tx UE通信传输类型，或不同Tx UE的QoS数据包，Tx UE被(予)配置在不同的区域层，第k层Tx UE检测所在层的ZB中潜在Tx UE数；如果第k层资源数大于第k层中潜在Tx UE数，Tx UE选择自己层中的资源R；如果第k层资源数小于第k层中潜在Tx UE数，Tx UE选择原本分配给另一层的资源R；
    ——基于源ID的渐进顺序，分配资源R给第k层每一个ZB内的Tx UE，多重资源分配给每一个Zone-ID的多个Tx UE，但是Tx UE之间不存在差异；
    ——如果第k层多个Tx UE公用一个相同的Zone-ID，第k层每一个Zone-ID中的每一个Tx UE建立的RMT来区分资源；
    ——如果共享相同源ID的Tx UE不止一个，则基于LUT递升次序，划分资源给Tx UE；
    ——如果共享相同源ID和相同LUT的Tx UE不止一个，Tx UE则基于自检测规程来选择资源。
  10. 根据权利要求9所述的资源选择方法，其特征在于，第k+1层资源池配置为至少两种子资源池，能够向其他UE发送位置的Tx UE被允许进入第一子资源池，不能够向其他UE发送位置的Tx UE被允许进入第二子资源池。
  11. 根据权利要求10所述的资源选择方法，其特征在于，每一个区域均被配置所述至少两种子资源池。
  12. 根据权利要求11所述的资源选择方法，其特征在于，所述子资源池分为FDM基资源和TDM基资源。
  13. 根据权利要求1所述的资源选择方法，其特征在于，每一个Tx UE通过SCI自主激活多个PSFCH资源或自主激活PSFCH资源子集，作为HARQ反馈资源。
  14. 根据权利要求13所述的资源选择方法，其特征在于，PSFCH资源池可以视为原始PSFCH资源集，而由Tx UE从原始PSFCH资源集中选择并激活的PSFCH资源的所有组合可被视为扩展PSFCH资源集，扩展PSFCH资源集是取决于(预)配置的参数M E，原始PSFCH资源集和扩展PSFCH资源集彼此都是透明的只需依赖于预先确定映射表或公 式。
  15. 根据权利要求13所述的资源选择方法，其特征在于，Tx UE通过PSSCH发送带有相关PSCCH头的数据包，用PSFCH资源子集ID来激活PSFCH资源。
  16. 根据权利要求13所述的资源选择方法，其特征在于，Rx UE从激活的资源子集中选择部分或全部的PSFCH资源，并反馈包含HARQ NAK的SCFI给相关Tx UE。
  17. 根据权利要求16所述的资源选择方法，其特征在于，如果Rx UE从两个以上Tx UEs收到不同的数据包，Rx UE根据相关的SCI的信息，从激活的PSFCH资源子集中选择部分或全部的PSFCH资源从而使选择PSFCH资源没有重复，并分别反馈包含HARQ NAK的SCFI给相关多个Tx UE，也就是Rx UE在不同Tx UE的SCI的信息中检测到被激活的PSFCH资源的子集中有相同的PSFCH资源，那么这些相同的PSFCH资源将不被作为HARQ NAK的资源使用。
  18. 根据权利要求17所述的资源选择方法，其特征在于，Tx UE将会从针对组播多个Rx UE成员中接收相应的PSFCHs，检测是否有NAK反馈，只要Tx UE在其激活的PSFCH资源中检测到一个以上相应的NAK，Tx UE就进行其数据包重传，或者，通过组合所有PSFCH资源(非相干或相干组合)，Tx UE检测是否有NAK反馈。Tx UE在检测到在相关PSFCH上发送的相应NAK时进行其数据包重传。
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