CN116744257A - V2X resource scheduling method and device, storage medium and user equipment - Google Patents

V2X resource scheduling method and device, storage medium and user equipment Download PDF

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Publication number
CN116744257A
CN116744257A CN202310652382.5A CN202310652382A CN116744257A CN 116744257 A CN116744257 A CN 116744257A CN 202310652382 A CN202310652382 A CN 202310652382A CN 116744257 A CN116744257 A CN 116744257A
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direct link
resource
selection information
direct
determining
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邓云
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Beijing Ziguang Zhanrui Communication Technology Co Ltd
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Beijing Ziguang Zhanrui Communication Technology Co Ltd
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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
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/535—Allocation or scheduling criteria for wireless resources based on resource usage policies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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

Abstract

A V2X resource scheduling method and device, a storage medium and user equipment, the V2X resource scheduling method comprises the following steps: receiving downlink signaling from a base station, wherein the downlink signaling can indicate resource selection information; direct link transmission resources for at least one direct link are determined based at least on the resource selection information. The technical scheme of the invention can improve the utilization efficiency of the V2X scheduling resource so as to improve the transmission efficiency of V2X.

Description

V2X resource scheduling method and device, storage medium and user equipment
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a V2X resource scheduling method and apparatus, a storage medium, and a user equipment.
Background
In communication standard protocol Release 12 (Release 12), the long term evolution (Long Term Evolution, LTE) system introduces direct communication (Direct Communication). A plurality of User Equipments (UEs) may communicate directly with each other through a PC5 interface. The PC5 interface is a direct interface between UEs. There are two modes of resource allocation in the prior art, one is a scheduling resource allocation (scheduled resource allocation), which is configured by the base station through dedicated signaling; one is an automatic resource selection approach (autonomous resource selection), from which the base station can provide the UE with a pool of resources for direct communication via system messages or radio resource control (Radio Resource Control, RRC) signaling. If the transmitted UE (Transmitter UE) is not within network coverage, the UE selects resources for direct communication from a pre-configured pool of resources using an automatic resource selection approach.
In the prior art, the third generation partnership project (3rd Generation Partnership Project,3GPP) also supports the Vehicle-to-evolution (V2X) based on direct communication. While 3GPP is researching the introduction of V2X in New Radio (NR) systems. Because the 5G system can provide larger bandwidth and lower time delay, the service requirement of V2X can be better met.
In NR V2X, the resource allocation scheme in LTE is basically extended, such as the introduction of mode1 (mode 1): the base station schedules transmission resources for V2X data for the UE; mode 2 (mode 2): the UE determines transmission resources of V2X data, and the UE selects the transmission resources based on a network-configured resource pool or a preconfigured resource pool. When the UE needs to adopt mode1, the UE needs to be in an RRC connected state, and the base station may schedule transmission resources for V2X data for the UE through RRC signaling or downlink control signaling (Downlink Control Information, DCI), and after receiving the scheduled resources, the UE sends the V2X data to an Rx UE (receiving UE) through a PC5 interface in a slot where the scheduled resources are applicable. In Mode1, one Tx UE may transmit V2X data to multiple UEs at the same time, and the Tx UE and the multiple UEs simultaneously establish a unicast channel for a direct link. The Tx UE may provide the link quality information of these direct links to the base station so that the base station may reasonably schedule the transmission resources of the Tx UE to accommodate the channel conditions of the different direct links.
However, in mode1, for the transmission resources for V2X data scheduled by the base station for the UE, the UE autonomously decides the receiving UE (i.e., rx UE) to which the resources are applied, which may cause the Tx UE to apply unsuitable transmission resources to a certain receiving UE, resulting in transmission failure.
Disclosure of Invention
The invention solves the technical problem of improving the utilization efficiency of V2X scheduling resources so as to improve the transmission efficiency of V2X.
In order to solve the above technical problems, an embodiment of the present invention provides a V2X resource scheduling method, where the V2X resource scheduling method includes: receiving downlink signaling from a base station, wherein the downlink signaling can indicate resource selection information; direct link transmission resources for at least one direct link are determined based at least on the resource selection information.
Optionally, the resource selection information includes a modulation coding parameter corresponding to a direct link transmission resource, and determining the direct link transmission resource for at least one direct link according to the resource selection information includes: determining modulation and coding parameters corresponding to each direct link according to a first mapping relation and link quality of each direct link, wherein the first mapping relation comprises a plurality of link quality values and a plurality of modulation and coding parameters corresponding to the plurality of link quality values; and if the modulation coding parameters corresponding to the direct link exist and are consistent with the modulation coding parameters in the resource selection information, using the direct link transmission resources indicated by the downlink signaling for data transmission of the direct link.
Optionally, the modulation coding parameter is a modulation coding order.
Optionally, the resource selection information includes an index of a destination device to which the direct link transmission resource is applied, and determining the direct link transmission resource for at least one direct link according to the resource selection information includes: determining a destination device according to a second mapping relation and indexes of the destination device, wherein the second mapping relation comprises indexes of a plurality of destination devices and a plurality of corresponding destination devices; determining a direct link associated with the destination device; and using the direct link transmission resource indicated by the downlink signaling for the associated direct link.
Optionally, the resource selection information includes an RNTI used for scrambling the downlink signaling, and determining the direct link transmission resource for at least one direct link according to the resource selection information includes: decoding the downlink signaling by adopting different RNTI, and determining a first RNTI adopted for successfully demodulating the downlink signaling; determining a target direct link according to the first RNTI and the corresponding relation between each RNTI and the direct link; and using the direct link transmission resource indicated by the downlink signaling for the target direct link.
Optionally, the resource selection information includes an application time domain location of a direct link transmission resource, and determining the direct link transmission resource for at least one direct link according to the resource selection information includes: determining general modulation coding parameters and link quality of each direct link; determining the actual application time domain position of each direct link transmission resource; and if the first direct link is determined to be applicable to the modulation coding parameters except the universal modulation coding parameters, using the direct link transmission resources of which the actual application time domain position is consistent with the application time domain position for the first direct link.
Optionally, the determining the direct link transmission resource for at least one direct link according to the resource selection information includes: determining a universal RNTI, a universal modulation coding parameter and link quality of each direct link; and if the second direct link is determined to be applicable to the modulation coding parameters except the universal modulation coding parameters, using direct link transmission resources of the downlink signaling indication obtained by demodulating the RNTI except the universal RNTI for the second direct link.
Optionally, the determining, at least according to the resource selection information, a direct link transmission resource for at least one direct link includes: determining a first direct link applicable to the direct link transmission resource indicated by the downlink signaling according to the resource selection information and the link quality of the at least one direct link; if the number of the first direct links applicable to the same direct link transmission resource is a plurality, determining a final direct link applicable to the same direct link transmission resource from the plurality of first direct links according to the service quality requirement of the V2X data transmitted by the at least one direct link.
Optionally, the direct link transmission resource is a semi-static direct link transmission resource or a dynamic direct link transmission resource scheduled by the serving base station.
In order to solve the technical problem, the embodiment of the invention also discloses a V2X resource scheduling device, wherein the V2X resource scheduling device comprises: the downlink signaling receiving module is suitable for receiving downlink signaling from the base station, and the downlink signaling can indicate resource selection information; a resource scheduling module adapted to determine direct link transmission resources for at least one direct link based at least on the resource selection information.
The embodiment of the invention also discloses a storage medium, on which computer instructions are stored, wherein the computer instructions execute the steps of the V2X resource scheduling method when running.
The embodiment of the invention also discloses user equipment, which comprises a memory and a processor, wherein the memory stores computer instructions capable of running on the processor, and the processor executes the steps of the V2X resource scheduling method when running the computer instructions.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the technical scheme of the invention receives the downlink signaling from the base station, and the downlink signaling can indicate the resource selection information; direct link transmission resources for at least one direct link are determined based at least on the resource selection information. In the technical scheme of the invention, the base station can directly indicate or indirectly indicate the resource selection information through the downlink signaling, and the user equipment can determine the resource selection information through the downlink signaling from the base station; the user equipment can determine the direct link transmission resource for the direct link at least according to the resource selection information, so that the problems of transmission failure and the like caused by the fact that the user equipment autonomously determines the direct link transmission resource of the direct link are avoided, the suitability of the transmission resource determination for the direct link is ensured, and the transmission efficiency of V2X is further improved.
Further, the resource selection information includes a modulation coding parameter corresponding to a direct link transmission resource, or the resource selection information includes an index of a destination device to which the direct link transmission resource is applied, or the resource selection information includes an RNTI used for scrambling the downlink signaling. In the technical scheme of the invention, when the resource selection information comprises modulation coding parameters or indexes of target equipment, the resource selection information can be carried in downlink signaling and sent to the user equipment, and the user equipment can directly acquire the resource selection information from the downlink signaling; when the resource selection information comprises the RNTI used for scrambling the downlink signaling, the user equipment can acquire the resource selection information by attempting to demodulate the downlink signaling, so that the flexibility of sending and receiving the resource selection information is ensured.
Drawings
FIG. 1 is a flow chart of a method for scheduling V2X resources according to an embodiment of the present invention;
FIG. 2 is a flow chart of one embodiment of step S102 shown in FIG. 1;
FIG. 3 is a flow chart of another embodiment of step S102 shown in FIG. 1;
FIG. 4 is a flow chart of yet another embodiment of step S102 shown in FIG. 1;
FIG. 5 is a flow chart of yet another embodiment of step S102 shown in FIG. 1;
FIG. 6 is a flow chart of yet another embodiment of step S102 shown in FIG. 1;
fig. 7 is a schematic structural diagram of a V2X resource scheduling apparatus according to an embodiment of the present invention.
Detailed Description
As described in the background, in NR V2X mode1, for the transmission resources for V2X data scheduled by the serving base station for the UE, the UE autonomously decides the receiving UE (i.e. Rx UE) to which the resources are applied, which may cause the Tx UE to apply unsuitable transmission resources to a certain receiving UE, resulting in transmission failure.
In the technical scheme of the invention, the base station can directly indicate or indirectly indicate the resource selection information through the downlink signaling, and the user equipment can determine the resource selection information through the downlink signaling from the base station; the user equipment can determine the direct link transmission resource for the direct link at least according to the resource selection information, so that the problems of transmission failure and the like caused by the fact that the user equipment autonomously determines the direct link transmission resource of the direct link are avoided, the suitability of the transmission resource determination for the direct link is ensured, and the transmission efficiency of V2X is further improved.
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
Fig. 1 is a flowchart of a V2X resource scheduling method according to an embodiment of the present invention.
The V2X resource scheduling method can be used for a user equipment side. In particular, the steps shown in fig. 1 may be performed by a user equipment, for example, the user equipment transmitting the user equipment, i.e. transmitting V2X data, performs the steps shown in fig. 1.
As shown in fig. 1, the V2X resource scheduling method may include the steps of:
step S101: receiving downlink signaling from a base station, wherein the downlink signaling can indicate resource selection information;
step S102: direct link transmission resources for at least one direct link are determined based at least on the resource selection information.
It should be noted that the serial numbers of the steps in the present embodiment do not represent a limitation on the execution sequence of the steps.
The base station (or serving base station) in the present invention refers to a base station with which the Tx UE establishes RRC connection, and for the Tx UE, only downlink signaling of the serving base station is received, so the base station in the present invention refers to a serving base station of the Tx UE.
The user equipment (including the transmitting user equipment and the receiving user equipment) in this embodiment is user equipment supporting NR V2X service. The receiving ue refers to a ue that receives V2X data. The same ue may be both a transmitting ue and a receiving ue, e.g. both ues perform bi-directional V2X data transmission, where each ue is both a transmitting ue and a receiving ue.
In one particular scenario, a Tx UE may transmit V2X traffic (V2X service) to multiple receiving UEs (Rx UEs), such as on frequency F1: transmitting V2X service 1 to UE1, the direct link between Tx UE and UE1 is referred to as SL1 (i.e., SL index is SL 1); transmitting V2X service 2 and service 3 to UE2, the direct link between Tx UE and UE2 being referred to as SL2; the V2Xservice 4 is transmitted to UE3, and the direct link between Tx UE and UE3 is called SL3. At frequency F2: the V2X service 5 is transmitted to UE4, and the direct link between Tx UE and UE4 is referred to as SL4. The serving base station may configure the SL index corresponding to the direct link, or the Tx UE indicates the SL index corresponding to the different direct link to the serving base station.
The Tx UE may measure the link quality of each direct link (i.e., SL1, SL2, SL3, and SL 4), or the Rx UE may measure the link quality of each direct link and send the link quality to the Tx UE, which is not limited in the embodiment of the present invention.
The Tx UE may report the link quality of each direct link or part of the direct links to the serving base station. The serving base station may allocate appropriate transmission resources according to the link quality of the direct link currently established by the Tx UE, configure an appropriate modulation coding scheme (Modulation and Coding Scheme, MCS), and then send DCI indicating the direct link transmission resources to the Tx UE. The V2X service developed by the Tx UE to different receiving UEs can be all adopted in a mode1, namely, direct link transmission resources are all scheduled by a service base station; or may be partially mode1, and the rest may be mode 2, for example, direct link transmission resources on frequency F1 are all scheduled by the serving base station, and direct link transmission resources on frequency F2 are all determined by the UE using an automatic resource selection mode. The Tx UE may determine which direct link transmission resources are scheduled by the serving base station and which direct link transmission resources are determined by the UE automatic resource selection; or the serving base station specifies which direct link transmission resources are scheduled by the serving base station, this patent is not limited. The Tx UE typically only needs to report the link quality of the direct link with mode 1.
In the implementation of step S101, the serving base station may send downlink signaling to the ue, and the ue may receive the downlink signaling, where the downlink signaling may directly or indirectly indicate the resource selection information. Specifically, the downlink signaling may be RRC signaling or DCI. The resource selection information may be directly carried in the downlink signaling, for example, the downlink signaling includes the resource selection information; or indirectly carried in the downlink signaling, for example, a radio network temporary identifier (Radio Network Temporary Identity, RNTI) scrambling the downlink signaling is the resource selection information.
In implementations, the resource selection information may directly indicate the direct link to which the direct link transmission resource is applicable. For example, if the DCI includes the scheduling information slgrant 1, and the DCI may also indicate the direct link SL1 (i.e., the direct link index SL index), the UE may use the direct link transmission resource scheduled by the scheduling information slgrant 1 for the direct link SL1.
In a specific implementation of step S102, the user equipment may determine the direct link transmission resources for the at least one direct link according to the resource selection information, or may combine the resource selection information and the link quality of the at least one direct link.
Specifically, the resource selection information may also indicate a link quality value to which the direct link transmission resource is applicable, in other words, the resource selection information may indicate a correspondence between the direct link transmission resource and the link quality value. More specifically, the resource selection information may be a link quality value applicable to the direct link transmission resource indicated by the downlink signaling. Thus, the user equipment can determine the direct link transmission resources applicable to the direct link through the resource selection information and the link quality of the direct link.
In the embodiment of the invention, the base station can directly indicate or indirectly indicate the resource selection information through the downlink signaling, and the user equipment can determine the resource selection information through the downlink signaling from the base station; the user equipment can determine the direct link transmission resource for the direct link at least according to the resource selection information, so that the problems of transmission failure and the like caused by the fact that the user equipment autonomously determines the direct link transmission resource of the direct link are avoided, the suitability of the transmission resource determination for the direct link is ensured, and the transmission efficiency of V2X is further improved.
In a specific embodiment, the direct link transmission resource may be a semi-static direct link transmission resource or a dynamic direct link transmission resource scheduled by the base station. For the transmitting user equipment in the connection state, the service base station can configure semi-static direct link transmission resources for the user equipment through RRC signaling, such as configuration of the period, the initial time slot, the occupied frequency domain resources and other information of the semi-static direct link transmission resources; the service base station can also schedule dynamic direct link transmission resources through DCI, and each DCI indicates one direct link transmission resource; the serving base station may also allocate semi-static direct link transmission resources for the transmitting user equipment by combining RRC signaling and DCI, e.g. the RRC signaling configures a period of the semi-static direct link transmission resources, where the DCI indicates a starting time slot of the first direct link transmission resource, occupied frequency domain resources, and then repeats according to the period.
In one non-limiting embodiment of the present invention, the resource selection information includes modulation coding parameters corresponding to direct link transmission resources. Referring to fig. 2, step S102 shown in fig. 1 may include the following steps:
step S201, determining modulation coding parameters corresponding to each direct link according to a first mapping relation and link quality of each direct link, wherein the first mapping relation comprises a plurality of link quality values and a plurality of modulation coding parameters corresponding to the plurality of link quality values;
step S202: and if the modulation coding parameters corresponding to the direct link exist and are consistent with the modulation coding parameters in the resource selection information, using the direct link transmission resources indicated by the downlink signaling for data transmission of the direct link.
The modulation coding parameter referred to in this embodiment may be MCS. That is, the base station carries the MCS in the downlink signaling.
In a specific embodiment, the modulation coding parameter may be a modulation coding order, for example, representing quadrature phase shift keying (Quadrature Phase Shift Keying, QPSK), 16 quadrature amplitude modulation (Quadrature Amplitude Modulation), 64QAM, etc.
In a specific implementation, the first mapping relationship may be preconfigured by the base station, for example, the base station sends the first mapping relationship to the Tx UE through RRC signaling in advance. Alternatively, the first mapping relationship may be predetermined by a communication standard protocol.
Referring to table 1, table 1 shows a first mapping relationship, where the first mapping relationship includes a plurality of link quality values and a plurality of modulation coding parameters corresponding to the plurality of link quality values.
TABLE 1
Link quality value MCS
1 QPSK
2 QPSK
3 QPSK
4 QPSK
5 QPSK
6 QPSK
7 16QAM
8 16QAM
9 16QAM
10 64QAM
11 64QAM
12 64QAM
13 64QAM
14 64QAM
15 64QAM
Wherein a higher link quality value indicates a higher quality of the direct link.
It should be noted that, regarding the first mapping relationship, the first mapping relationship may be any other applicable correspondence relationship between the link quality value and the MCS, which is not limited in the embodiment of the present invention.
In one embodiment of the invention, the link quality is represented by a channel quality indication (Channel Quality Indicator, CQI).
In a specific application scenario, the Tx UE determines, according to the CQI of each direct link reported by the Tx UE and the MCS adopted by the direct link transmission resource indicated in the DCI, whether the CQI corresponding to the MCS (the SL CQI corresponding to the MCS obtained by the Tx UE through the lookup table 1) is consistent with the CQI of the reported direct link, and if so, applies the transmission resource to the direct link. Taking direct link SL1 and direct link SL2 as an example, if the base station knows that the CQI of SL1 is 7 and that of SL2 is 10, the base station transmits two DCIs to the Tx UE, corresponding to the allocation of the direct link transmission resources twice, respectively, wherein one of the DCIs indicates that the MCS is 16QAM and the other one of the DCIs indicates that the MCS is 64QAM. After the Tx UE receives the two DCIs, it is determined that SL1 is suitable for the direct link transmission resource corresponding to 16QAM (i.e., the direct link transmission resource indicating 16QAM is applied to SL 1) according to the CQI of each direct link, and SL2 is suitable for the direct link transmission resource corresponding to 64QAM.
In a preferred embodiment of the present invention, step S102 shown in fig. 1 may include the following steps: determining a first direct link applicable to the direct link transmission resource indicated by the downlink signaling according to the resource selection information and the link quality of the at least one direct link; if the number of the first direct links applicable to the same direct link transmission resource is a plurality, determining a final direct link applicable to the same direct link transmission resource from the plurality of first direct links according to the service quality requirement of the V2X data transmitted by the at least one direct link.
In this embodiment, different V2X services may have different quality of service requirements (Quality of Service, qoS), or the same quality of service requirements. In particular, different QoS requirements may be expressed by parameters such as priority, transmission delay, transmission bit error rate, etc. Thus, if the number of the first direct links applicable to the same direct link transmission resource is determined to be a plurality according to the resource selection information and the link quality of the at least one direct link, the final direct link can be determined according to the quality of service requirement of the V2X data transmitted by the at least one direct link.
In a specific application scenario of the embodiment of the present invention, it is possible that multiple direct links may all apply the same MCS, and at this time, the Tx UE may select one from the multiple direct links to perform V2X transmission in combination with other QoS parameters of the V2X service, such as delay, etc. For example, the CQI of each of the direct links SL2 and SL3 indicates that direct link transmission may be performed by using 64QAM, and when the direct link transmission resource received by the Tx UE uses 64QAM, that is, the modulation coding mode of 64QAM is indicated to be applied to the direct link transmission resource in DCI, the Tx UE determines which to select to perform transmission in combination with the V2X data delay transmitted on the buffered direct links SL2 and SL3, and if the delay requirement of the data transmitted on the direct link SL2 is more urgent, the transmission resource may be used to transmit the V2X data on the direct link SL2, so as to avoid the delay exceeding the set threshold.
In one non-limiting embodiment of the invention, the resource selection information includes an index of a destination device to which the direct link transmission resource is applied. Referring to fig. 3, step S102 shown in fig. 1 may include the following steps:
step S301: determining a destination device according to a second mapping relation and indexes of the destination device, wherein the second mapping relation comprises indexes of a plurality of destination devices and a plurality of corresponding destination devices;
step S302: determining a direct link associated with the destination device;
step S303: and using the direct link transmission resource indicated by the downlink signaling for the associated direct link.
Since the identity of the destination device (destination) may be large, e.g. 24 bits, indicating it via downlink signaling, e.g. DCI, would increase the signaling overhead. Therefore, in this embodiment, the base station may indicate the index of the specific destination device (destination) in downlink signaling, such as DCI or RRC signaling.
For example, the index of UE1 is 00, the index of UE2 is 01, the index of UE3 is 10, and the index of UE4 is 11, so that only 2 bits of information are needed in the downlink signaling, and signaling overhead is saved.
In a specific implementation, the second mapping relationship may be preconfigured by the base station, for example, the base station sends the second mapping relationship to the Tx UE through RRC signaling in advance. Alternatively, the second mapping relationship may be predetermined by a communication standard protocol, for example, the respective index is sequentially arranged according to the UE identification number, which is not limited in the embodiment of the present invention.
In a non-limiting embodiment of the present invention, the resource selection information includes a direct link Index (SL Index) to which the direct link transmission resource is applied, and step S102 shown in fig. 1 may include the steps of: determining a direct link according to the direct link index and a third mapping relation, wherein the third mapping relation comprises a plurality of direct link indexes and a plurality of corresponding direct links; and using the direct link transmission resource indicated by the downlink signaling for the determined direct link.
In this embodiment, the third mapping relationship may be preconfigured by the base station, for example, the base station sends the third mapping relationship to the Tx UE through RRC signaling in advance. Alternatively, the second mapping relationship may be set by the Tx UE and then transmitted to the base station through RRC signaling.
For example, SL index is a direct link between Tx UE and UE1 on SL1 corresponding frequency F1, SL index is a direct link between Tx UE and UE2 on SL2 corresponding frequency F1, and so on.
In a non-limiting embodiment of the present invention, the resource selection information includes an RNTI used for scrambling the downlink signaling, referring to fig. 4, step S102 shown in fig. 1 may include the following steps:
step S401: decoding the downlink signaling by adopting different RNTI, and determining a first RNTI adopted for successfully demodulating the downlink signaling;
step S402: determining a target direct link according to the first RNTI and the corresponding relation between each RNTI and the direct link;
step S403: and using the direct link transmission resource indicated by the downlink signaling for the target direct link.
In this embodiment, the serving base station may allocate RNTIs for different destinations to the Tx UE in advance, or allocate RNTIs for different direct links indexes to the Tx UE. The DCIs sent by the serving base station are scrambled by RNTI.
In a specific application scenario, DCI sent by a base station is scrambled by RNTI, and different RNTIs may be allocated to different destinations. For example, for scheduling of direct link transmission resources (i.e., SL Grant) for UE1 (i.e., direct link SL 1), RNTI1 scrambling is employed; the scheduling of the direct link transmission resource for UE2 (i.e., direct link SL 2) employs RNTI2 scrambling; the scheduling of direct link transmission resources for UE3 (i.e. direct link SL 3) employs RNTI3 scrambling.
When receiving the SL Grant issued by the base station through DCI, the Tx UE decodes the DCI by adopting different RNTI, so as to obtain which destination device the direct link transmission resource scheduled by the SL Grant is used for, namely, which direct link the direct link transmission resource scheduled by the SL Grant is used for.
In a non-limiting embodiment of the present invention, the resource selection information includes an application time domain location of a direct link transmission resource, referring to fig. 5, step S102 shown in fig. 1 may include the following steps:
step S501: determining general modulation coding parameters and link quality of each direct link;
step S502: determining the actual application time domain position of each direct link transmission resource;
step S503: and if the first direct link is determined to be applicable to the modulation coding parameters except the universal modulation coding parameters, using the direct link transmission resources of which the actual application time domain position is consistent with the application time domain position for the first direct link.
In this embodiment, the direct link transmission resources to which the partial direct link is applicable may be determined. The partial direct link may refer to a first direct link, i.e. a direct link that is adapted to modulation coding parameters other than the generic modulation coding parameters. The common modulation coding parameters refer to the MCS employed by the direct link by default.
It will be appreciated that the generic modulation and coding parameters may be configured by the base station to the user equipment or may be agreed upon by a communication standard protocol.
In a specific application scenario of the present invention, the MCS adopted by the direct link default is 16QAM. If the Tx UE reports the CQI of the direct link SL0, the base station configures, in advance, the time domain location, which is applied to the transmission resource of the SL0, for the UE through RRC signaling, specifically, a transmission time slot parameter, so that the Tx UE can apply, when receiving the SL grant, the direct link transmission resource of grant scheduling, which applies the time domain location, to the direct link SL0. For example, the base station knows that the CQI of the direct link SL3 is applicable to 64QAM, instructs the Tx UE to use the transmission resource with MCS of 64QAM for the direct link SL3 through RRC signaling, and is limited to a specific transmission slot. The Tx UE receives a SL Grant indicated by DCI issued by the base station, where the DCI may indicate a time slot to which the SL Grant is applied, or an application time slot of the SL Grant and a time slot where the DCI is located have a time interval (e.g., an interval of 1 time slot) preset by a protocol, and the Tx UE may learn that a time domain position, that is, an applied time slot, of a transmission resource scheduled by the SL Grant is actually applied, and if the time slot belongs to a specific transmission time slot indicated by the base station, the Tx UE determines to use the transmission resource scheduled by the SL Grant for a direct link SL3.
In a non-limiting embodiment of the present invention, referring to fig. 6, step S102 shown in fig. 1 may include the following steps:
step S601: determining a universal RNTI, a universal modulation coding parameter and link quality of each direct link;
step S602: and if the second direct link is determined to be applicable to the modulation coding parameters except the universal modulation coding parameters, using direct link transmission resources of the downlink signaling indication obtained by demodulating the RNTI except the universal RNTI for the second direct link.
Unlike the previous embodiments, the embodiments of the present invention determine the direct link transmission resources to which the partial direct link is applicable based on the RNTI of the scrambled downlink signaling. The partial direct link may refer to a second direct link, i.e. a direct link that is adapted to modulation coding parameters other than the generic modulation coding parameters. The common modulation coding parameters refer to the MCS employed by the direct link by default.
In a specific application scenario of the present invention, the MCS adopted by the direct link default is 16QAM. The base station knows that the CQI of the direct link SL3 is applicable to 64QAM, the base station uses special RNTI (Special RNTI) for the scheduling of the direct link SL3, and uses a common RNTI, e.g., a SL C-RNTI, for the scheduling of other SL grants. The scheduling information may not indicate MCS at this time. The Tx UE receives the special RNTI-scrambled DCI, knows the direct link transmission resources it indicates, and uses it for direct link SL3 that can use 64QAM. When the Tx UE receives the SL C-RNTI scrambled DCI, it knows the direct link transmission resources it indicates, which can be used for other direct links. Further, the Tx UE may also determine which direct link to use for the transmission resource scheduled by the SL grant in conjunction with the QoS of the V2X traffic.
Referring to fig. 7, the embodiment of the present invention further discloses a V2X resource scheduling device 70, where the V2X resource scheduling device 70 may include a downlink signaling receiving module 701 and a resource scheduling module 702.
The downlink signaling receiving module 701 is adapted to receive downlink signaling from a base station, where the downlink signaling can indicate resource selection information; the resource scheduling module 702 is adapted to determine direct link transmission resources for at least one direct link based at least on the resource selection information.
In the embodiment of the invention, the base station can directly indicate or indirectly indicate the resource selection information through the downlink signaling, and the user equipment can determine the resource selection information through the downlink signaling from the base station; the user equipment can determine the direct link transmission resource for the direct link at least according to the resource selection information, so that the problems of transmission failure and the like caused by the fact that the user equipment autonomously determines the direct link transmission resource of the direct link are avoided, the suitability of the transmission resource determination for the direct link is ensured, and the transmission efficiency of V2X is further improved.
For more details of the working principle and the working manner of the V2X resource scheduling device 70, reference may be made to the related descriptions in fig. 1 to fig. 6, which are not repeated herein.
The embodiment of the invention also discloses a storage medium, on which computer instructions are stored, which when run can execute the steps of the methods shown in fig. 1 to 6. The storage medium may include ROM, RAM, magnetic or optical disks, and the like. The storage medium may also include a non-volatile memory (non-volatile) or a non-transitory memory (non-transitory) or the like.
The embodiment of the invention also discloses user equipment, which can comprise a memory and a processor, wherein the memory stores computer instructions capable of running on the processor. The processor, when executing the computer instructions, may perform the steps of the methods shown in fig. 1-6. The user equipment includes, but is not limited to, mobile phones, computers, tablet computers and other user equipment.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims (12)

1. A V2X resource scheduling method, comprising:
reporting the link quality of the direct link of the application mode 1;
receiving downlink signaling from a base station, wherein the downlink signaling can indicate resource selection information and direct link transmission resources, the direct link transmission resources are allocated according to the link quality, and the resource selection information comprises direct link indexes applied by the direct link transmission resources;
determining a direct link transmission resource for at least one direct link at least according to the resource selection information, specifically determining a direct link according to the direct link index and a third mapping relation, wherein the third mapping relation comprises a plurality of direct link indexes and a plurality of corresponding direct links; and using the direct link transmission resource indicated by the downlink signaling for the determined direct link.
2. The V2X resource scheduling method according to claim 1, wherein the resource selection information includes modulation and coding parameters corresponding to direct link transmission resources, and wherein determining the direct link transmission resources for at least one direct link based at least on the resource selection information further comprises:
determining modulation and coding parameters corresponding to each direct link according to a first mapping relation and link quality of each direct link, wherein the first mapping relation comprises a plurality of link quality values and a plurality of modulation and coding parameters corresponding to the plurality of link quality values;
and if the modulation coding parameters corresponding to the direct link exist and are consistent with the modulation coding parameters in the resource selection information, using the direct link transmission resources indicated by the downlink signaling for data transmission of the direct link.
3. The V2X resource scheduling method according to claim 2, wherein the modulation coding parameter is a modulation coding order.
4. The V2X resource scheduling method according to claim 1, wherein the resource selection information includes an index of a destination device to which the direct link transmission resource is applied, and wherein determining the direct link transmission resource for at least one direct link according to the resource selection information further comprises:
determining a destination device according to a second mapping relation and indexes of the destination device, wherein the second mapping relation comprises indexes of a plurality of destination devices and a plurality of corresponding destination devices;
determining a direct link associated with the destination device;
and using the direct link transmission resource indicated by the downlink signaling for the associated direct link.
5. The V2X resource scheduling method according to claim 1, wherein the resource selection information comprises an RNTI employed for scrambling the downlink signaling, and wherein determining the direct link transmission resources for the at least one direct link based on the resource selection information further comprises:
decoding the downlink signaling by adopting different RNTI, and determining a first RNTI adopted for successfully demodulating the downlink signaling;
determining a target direct link according to the first RNTI and the corresponding relation between each RNTI and the direct link;
and using the direct link transmission resource indicated by the downlink signaling for the target direct link.
6. The V2X resource scheduling method of claim 1, wherein the resource selection information comprises an application time domain location of a direct link transmission resource, and wherein determining the direct link transmission resource for at least one direct link based at least on the resource selection information further comprises:
determining general modulation coding parameters and link quality of each direct link;
determining the actual application time domain position of each direct link transmission resource;
and if the first direct link is determined to be applicable to the modulation coding parameters except the universal modulation coding parameters, using the direct link transmission resources of which the actual application time domain position is consistent with the application time domain position for the first direct link.
7. The V2X resource scheduling method according to claim 1, wherein said determining direct link transmission resources for at least one direct link according to said resource selection information further comprises:
determining a universal RNTI, a universal modulation coding parameter and link quality of each direct link;
and if the second direct link is determined to be applicable to the modulation coding parameters except the universal modulation coding parameters, using direct link transmission resources of the downlink signaling indication obtained by demodulating the RNTI except the universal RNTI for the second direct link.
8. The V2X resource scheduling method according to claim 1, wherein said determining direct link transmission resources for at least one direct link based at least on said resource selection information further comprises: determining a first direct link applicable to the direct link transmission resource indicated by the downlink signaling according to the resource selection information and the link quality of the at least one direct link;
if the number of the first direct links applicable to the same direct link transmission resource is a plurality, determining a final direct link applicable to the same direct link transmission resource from the plurality of first direct links according to the service quality requirement of the V2X data transmitted by the at least one direct link.
9. The V2X resource scheduling method according to claim 1, wherein reporting the link quality of the direct link of application mode1 further comprises:
and receiving configuration information of a direct link to which the mode1 is applied.
10. A V2X resource scheduling apparatus, comprising:
means for reporting link quality of the direct link of application mode 1;
a downlink signaling receiving module, adapted to receive downlink signaling from a base station, where the downlink signaling can indicate resource selection information and direct link transmission resources, where the direct link transmission resources are allocated according to the link quality, and the resource selection information includes a direct link index to which the direct link transmission resources are applied;
a resource scheduling module adapted to determine a direct link transmission resource for at least one direct link at least according to the resource selection information, the resource scheduling module determining a direct link according to the direct link index and a third mapping relation, the third mapping relation comprising a plurality of direct link indexes and a plurality of direct links corresponding thereto; and using the direct link transmission resource indicated by the downlink signaling for the determined direct link.
11. A storage medium having stored thereon computer instructions which, when run, perform the steps of the V2X resource scheduling method of any one of claims 1 to 9.
12. A user equipment comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, characterized in that the processor, when executing the computer instructions, performs the steps of the V2X resource scheduling method of any one of claims 1 to 9.
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