CN115442766A - 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 PDFInfo
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- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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- H—ELECTRICITY
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- 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
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- H04W72/535—Allocation or scheduling criteria for wireless resources based on resource usage policies
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Abstract
A method and a device for scheduling V2X resources, a storage medium and user equipment are provided, wherein the method for scheduling the V2X resources comprises the following steps: receiving a 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 V2X scheduling resources so as to improve the V2X transmission efficiency.
Description
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 the Communication standard protocol version 12 (Release 12), a Long Term Evolution (LTE) system introduces Direct Communication (Direct Communication). A plurality of User Equipments (UEs) can communicate directly with each other through the PC5 interface. The PC5 interface is a direct interface between UEs. In the prior art, there are two modes of resource allocation, one is a scheduled resource allocation (scheduled resource allocation), which is configured by a base station through dedicated signaling; one is an automatic Resource selection (automatic Resource selection), in which a base station may provide a Resource pool for direct communication to a UE through a system message or Radio Resource Control (RRC) signaling, and the UE selects a Resource for direct communication from the Resource pool. If the transmitted UE (Transmitter UE) is not in the network coverage, the UE selects resources for direct communication from a pre-configured resource pool in an automatic resource selection mode.
In the prior art, the third Generation Partnership project (3 rd Generation Partnership project,3 gpp) also supports Vehicle-to-evolution (V2X) based on direct communication. While 3GPP is studying to introduce V2X in a New Radio (NR) system. 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 introducing mode1 (mode 1): a base station schedules transmission resources for V2X data for UE; mode 2 (mode 2): the UE determines transmission resources of the V2X data, and the UE selects the transmission resources based on a resource pool configured by the network or a pre-configured resource pool. When the UE needs to adopt mode1, the UE needs to be in an RRC connection state, the base station may schedule transmission resources for V2X data for the UE through an RRC signaling or a 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 time slot applicable to the scheduled resources. In Mode1, one Tx UE may transmit V2X data to multiple UEs at the same time, and the Tx UE and the multiple UEs establish a unicast channel of a direct link at the same time. The Tx UE may provide link quality information for these direct links to the base station so that the base station can reasonably schedule the Tx UE's transmission resources to accommodate the channel conditions of the different direct links.
However, in mode1, for the transmission resource 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 resource is applied, which may cause the Tx UE to apply an inappropriate transmission resource to a certain receiving UE, resulting in transmission failure.
Disclosure of Invention
The technical problem solved by the invention is how to improve the utilization efficiency of V2X scheduling resources so as to improve the V2X transmission efficiency.
In order to solve the above technical problem, an embodiment of the present invention provides a V2X resource scheduling method, where the V2X resource scheduling method includes: receiving a 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 modulation and coding parameters corresponding to direct link transmission resources, and the determining, according to the resource selection information, direct link transmission resources used for at least one direct link includes: determining a modulation coding parameter 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; and if the modulation coding parameters corresponding to the direct link 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 applies, and the determining the direct link transmission resource for at least one direct link according to the resource selection information includes: determining target equipment according to a second mapping relation and the index of the target equipment, wherein the second mapping relation comprises the indexes of a plurality of target equipment and a plurality of corresponding target equipment; 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 the determining, according to the resource selection information, the direct link transmission resource for at least one direct link includes: decoding the downlink signaling by adopting different RNTIs, 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 position of a direct link transmission resource, and the determining, according to the resource selection information, a direct link transmission resource for at least one direct link 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 suitable for the modulation coding parameters except the general modulation coding parameters, using the direct link transmission resource with the actual application time domain position consistent with the application time domain position for the first direct link.
Optionally, the determining the direct link transmission resource for the at least one direct link according to the resource selection information includes: determining a universal RNTI, universal modulation coding parameters and link quality of each direct link; and if the second direct link is determined to be suitable for the modulation coding parameters except the universal modulation coding parameters, using the direct link transmission resources indicated by the downlink signaling obtained by demodulating the RNTIs except the universal RNTI for the second direct link.
Optionally, the determining, according to at least the resource selection information, direct link transmission resources for at least one direct link includes: determining a first direct link of the direct link transmission resource suitable for the downlink signaling indication according to the resource selection information and the link quality of the at least one direct link; and if the number of the first direct links applicable to the same direct link transmission resource is multiple, determining a final direct link applicable to the same direct link transmission resource from multiple 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 above technical problem, an embodiment of the present invention further discloses a V2X resource scheduling apparatus, where the V2X resource scheduling apparatus includes: a downlink signaling receiving module, adapted to receive a downlink signaling from a base station, where 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 at least according to the resource selection information.
The embodiment of the invention also discloses a storage medium, wherein a computer instruction is stored on the storage medium, and the steps of the V2X resource scheduling method are executed when the computer instruction runs.
The embodiment of the invention also discloses user equipment which comprises a memory and a processor, wherein the memory is stored with a computer instruction capable of running on the processor, and the processor executes the step of the V2X resource scheduling method when running the computer instruction.
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 a 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. In the technical scheme of the invention, the base station can directly 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 determines the direct link transmission resource of the direct link independently are avoided, the suitability of the determination of the transmission resource for the direct link is ensured, and the transmission efficiency of V2X is improved.
Further, the resource selection information includes a modulation coding parameter corresponding to the direct link transmission resource, or the resource selection information includes an index of a destination device to which the direct link transmission resource applies, or the resource selection information includes an RNTI adopted to scramble 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 borne in downlink signaling and sent to user equipment, and the user equipment can directly acquire the resource selection information from the downlink signaling; when the resource selection information includes the RNTI adopted by the scrambling downlink signaling, the user equipment needs to 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 flowchart of a V2X resource scheduling method according to an embodiment of the present invention;
FIG. 2 is a flowchart of one embodiment of step S102 of FIG. 1;
FIG. 3 is a flowchart of another embodiment of step S102 shown in FIG. 1;
FIG. 4 is a flowchart of yet another embodiment of step S102 shown in FIG. 1;
FIG. 5 is a flowchart of yet another embodiment of step S102 shown in FIG. 1;
FIG. 6 is a flowchart 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 art, in NR V2X mode1, for a transmission resource for V2X data scheduled by a serving base station for a UE, the UE autonomously decides a receiving UE (i.e., rx UE) for resource application, which may cause the Tx UE to apply an inappropriate transmission resource 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 direct link transmission resource of the direct link is determined only by the user equipment autonomously are avoided, the suitability for determining the transmission resource for the direct link is ensured, and the transmission efficiency of V2X is improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart of a V2X resource scheduling method according to an embodiment of the present invention.
The V2X resource scheduling method may be used for a user equipment side. Specifically, the steps shown in fig. 1 may be performed by the user equipment, for example, the user equipment transmitting the user equipment, that is, the user equipment transmitting the V2X data, may perform the steps shown in fig. 1.
As shown in fig. 1, the V2X resource scheduling method may include the following steps:
step S101: receiving a 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 sequence numbers of the steps in this embodiment do not represent a limitation on the execution sequence of the steps.
It is understood that, in a specific implementation, the V2X resource scheduling method may be implemented by using a software program, where the software program runs in a processor integrated inside a chip or a chip module. The method may also be implemented by combining software and hardware, and the present application is not limited thereto.
In the present invention, a base station (or a serving base station) refers to a base station with which the Tx UE establishes an RRC connection, and for the Tx UE, only downlink signaling of the serving base station is received.
The user equipment (including the sending user equipment and the receiving user equipment) in this embodiment is user equipment supporting an NR V2X service. The receiving user equipment refers to user equipment for receiving V2X data. The same ue may be both a sending ue and a receiving ue, for example, two ues perform bidirectional V2X data transmission, and each ue is both a sending 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 the V2X service 1 to the UE1, and referring to a direct link between the Tx UE and the UE1 as SL1 (i.e. SL index is SL 1); transmitting V2X service 2 and service 3 to UE2, and referring the direct link between Tx UE and UE2 as SL2; v2Xservice 4 is transmitted to UE3, and the direct link between Tx UE and UE3 is referred to as SL3. At a frequency F2: the V2X service 5 is transmitted to UE4, and the direct link between the 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 may indicate the SL index corresponding to a 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 this embodiment of the present invention.
The Tx UE may report the link quality of each direct link or partial direct link to the serving base station. The serving base station may allocate a suitable transmission resource according to the link quality of the direct link currently established by the Tx UE, configure a suitable Modulation and Coding Scheme (MCS), and then send DCI to the Tx UE to indicate the direct link transmission resource. The Tx UE can all adopt the mode1 mode to the V2X services developed by different receiving UEs, i.e. the direct link transmission resources are all scheduled by the serving base station; or, a part of the resources may adopt the mode1, and the other part adopts the mode 2, for example, the direct link transmission resources on the frequency F1 are all scheduled by the serving base station, and the direct link transmission resources on the frequency F2 are all determined by the UE using the 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 may specify which direct link transmission resources are scheduled by the serving base station, which is not limited in this patent. The Tx UE typically only needs to report the link quality of the direct link in mode 1.
In a specific implementation of step S101, the serving base station may send a 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 may be indirectly carried in the downlink signaling, for example, a Radio Network Temporary Identity (RNTI) that scrambles the downlink signaling is resource selection information.
In a particular implementation, the resource selection information may directly indicate the direct link to which the direct link transmission resource applies. For example, the DCI includes the scheduling information SL grant1, and the DCI may also indicate the direct link SL1 (i.e., the direct link index SL index), so the UE may use the direct link transmission resource scheduled by the scheduling information SL grant1 for the direct link SL1.
In a specific implementation of step S102, the user equipment may determine the direct link transmission resource for the at least one direct link according to the resource selection information, or may determine the direct link transmission resource for the at least one direct link according to the resource selection information and the link quality of the at least one direct link.
In particular, 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 of 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 resource suitable for 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 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 direct link transmission resource of the direct link is determined only by the user equipment autonomously are avoided, the suitability for determining the transmission resource for the direct link is ensured, and the transmission efficiency of V2X is 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 transmission user equipment in a connected state, the serving base station may configure, through RRC signaling, semi-static direct link transmission resources for the user equipment, such as information of a period for configuring the semi-static direct link transmission resources, an initial time slot, occupied frequency domain resources, and the like; the serving base station may also schedule the dynamic direct link transmission resource through DCI, where each DCI indicates a direct link transmission resource; the serving base station may also allocate a semi-static direct link transmission resource to the transmitting user equipment by combining RRC signaling and DCI, for example, the RRC signaling configures a period of the semi-static direct link transmission resource, and the DCI indicates a starting time slot of the first direct link transmission resource and an occupied frequency domain resource, and then repeats according to the period.
In a non-limiting embodiment of the present invention, the resource selection information includes modulation and 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 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 and 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, and may represent Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (Quadrature Amplitude Modulation), 64QAM, or the like, for example.
In a specific implementation, the first mapping relationship may be pre-configured 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 pre-agreed by a communication standard protocol.
Specifically, 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 and 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 the first mapping relationship may also be any correspondence relationship between the link quality value and the MCS that can be implemented, and the embodiment of the present invention is not limited to this.
In an embodiment of the present invention, the link Quality is represented by a 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 used for the direct link transmission resource indicated in the DCI, whether the CQI corresponding to the MCS (the Tx UE may obtain the SL CQI corresponding to the MCS through the lookup table 1) is consistent with the reported CQI of the direct link, and if so, applies the transmission resource to the direct link. Taking the direct link SL1 and the direct link SL2 as an example, if the base station knows that the CQI of SL1 is 7 and the CQI of sl2 is 10, the base station sends two pieces of DCI to the Tx UE, which respectively correspond to two times of allocation of the direct link transmission resources, where one piece of DCI indicates that MCS is 16QAM and the other piece of DCI indicates that MCS is 64QAM. After receiving the two DCIs, the Tx UE determines, according to the CQI of each direct link, that SL1 is applicable to the direct link transmission resource corresponding to 16QAM (i.e., the direct link transmission resource indicating 16QAM is applied to SL 1), and SL2 is applicable to 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 of the direct link transmission resource suitable for the downlink signaling indication 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 suitable for the same direct link transmission resource is multiple, determining a final direct link suitable for the same direct link transmission resource from multiple 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 QoS requirements (Quality of Service) or have the same QoS requirements. Specifically, the different QoS requirements may be expressed by parameters such as priority, transmission delay, and transmission bit error rate. Thus, if the number of the first direct links suitable for the same direct link transmission resource is determined to be multiple 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 service quality 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 of the multiple direct links for V2X transmission in combination with other QoS parameters of the V2X service, such as time delay. For example, the CQIs of the direct links SL2 and SL3 both indicate that the direct link transmission may be performed by using 64QAM, when the direct link transmission resource received by the Tx UE uses 64QAM, that is, the DCI indicates that the modulation and coding scheme of 64QAM is applied to the direct link transmission resource, the Tx UE determines which is to be preferentially selected for transmission in combination with the buffered (buffer) delay of the V2X data transmitted on the 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 for transmitting the V2X data on the direct link SL2, so as to avoid that the delay thereof exceeds the set threshold.
In a non-limiting embodiment of the present 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 target equipment according to a second mapping relation and the index of the target equipment, wherein the second mapping relation comprises the indexes of a plurality of target equipment and a plurality of corresponding target equipment;
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 identification of the destination device (destination) may be large, for example, 24 bits, indicating it by downlink signaling, such as DCI, will increase signaling overhead. Therefore, in this embodiment, the base station may indicate the index of the specific destination device (destination) in the 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 need to be indicated in downlink signaling, thereby saving signaling overhead.
In a specific implementation, the second mapping relationship may be configured by the base station in advance, 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 predefined by a communication standard protocol, for example, the respective indexes are sequentially arranged according to the UE identification number, which is not limited in this 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) applied by a direct link transmission resource, and step S102 shown in fig. 1 may include the following steps: 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 direct links corresponding to the direct link indexes; 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 configured by the base station in advance, 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, the SL index is a direct link between the Tx UE and UE1 on the SL1 corresponding frequency F1, the SL index is a direct link between the Tx UE and UE2 on the SL2 corresponding frequency F1, and the like.
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 RNTIs, 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 link indexes to the Tx UE. DCIs transmitted by the serving base station are all scrambled by RNTIs.
In a specific application scenario, the DCI transmitted by the base station is scrambled by the 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; RNTI2 scrambling is employed for scheduling of direct link transmission resources for UE2 (i.e., direct link SL 2); 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 the DCI, the Tx UE decodes the DCI using different RNTIs, and thus can know which destination device the direct link transmission resource scheduled by the SL Grant is used for, and also can determine 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 position of a direct link transmission resource, referring to fig. 5, step S102 shown in fig. 1 may include the following steps:
step S501: determining a general modulation coding parameter 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 suitable for the modulation coding parameters except the general modulation coding parameters, using the direct link transmission resource with the actual application time domain position consistent with the application time domain position for the first direct link.
In this embodiment, a direct link transmission resource to which a part of direct links are applicable may be determined. The partial direct link may refer to a first direct link, i.e. a direct link applying modulation and coding parameters other than the generic modulation and coding parameters. The generic modulation coding parameter refers to the MCS adopted by the direct link by default.
It is understood that the general modulation coding parameters may be configured to the user equipment by the base station or may be agreed by a communication standard protocol.
In a specific application scenario of the present invention, the MCS adopted by the direct link is 16QAM by default. If the direct link SL0 reported by the Tx UE may adopt CQI of 64QAM, the base station configures, in advance through RRC signaling, a time domain position to which transmission resources of the SL0 are applied for the UE, specifically, a transmission timeslot parameter, so that the Tx UE can apply, when receiving the SL grant, the direct link transmission resources scheduled by the grant applying the time domain position to the direct link SL0. For example, the base station knows that the CQI of the direct link SL3 applies 64QAM, and instructs the Tx UE to use a transmission resource with MCS of 64QAM for the direct link SL3 by RRC signaling and is limited to a specific transmission slot. Tx UE receives SL Grant indicated by DCI sent by a base station, where DCI may indicate a time slot to which the SL Grant is applied, or a time interval (for example, the interval is 1 time slot) preset by a protocol between an application time slot of the SL Grant and a time slot in which the DCI is located, and Tx UE may know an actual application time domain position, that is, an application time slot, of transmission resources scheduled by the SL Grant, and if the time slot belongs to a specific transmission time slot indicated by the base station, tx UE determines to use the transmission resources 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, universal modulation coding parameters and link quality of each direct link;
step S602: and if the second direct link is determined to be suitable for the modulation coding parameters except the universal modulation coding parameters, using the direct link transmission resources indicated by the downlink signaling obtained by demodulating the RNTIs except the universal RNTI for the second direct link.
Different from the foregoing embodiments, in the embodiments of the present invention, a direct link transmission resource to which a part of a direct link is applicable is determined according to an RNTI of a scrambled downlink signaling. The partial direct link may refer to a second direct link, i.e. a direct link applying modulation coding parameters other than the general modulation coding parameters. The generic modulation coding parameter refers to the MCS adopted by the direct link by default.
In a specific application scenario of the present invention, the MCS adopted by the direct link is 16QAM by default. The base station knows that the CQI of the direct link SL3 applies 64QAM, and the base station uses a Special RNTI (Special RNTI) for scheduling of the direct link SL3, and uses a universal RNTI, such as SL C-RNTI, for scheduling of other SL grants. The scheduling information may not indicate the MCS at this time. The Tx UE receives the special RNTI scrambled DCI, knows the direct link transmission resource it indicates, and uses it for the direct link SL3 capable of using 64QAM. When the Tx UE receives the DCI scrambled by the SL C-RNTI, the direct link transmission resource indicated by the DCI is known, and the DCI can be used for other direct links. Further, the Tx UE may also determine which direct link to use the transmission resource scheduled by the SL grant in conjunction with the QoS of the V2X traffic.
Referring to fig. 7, an embodiment of the present invention further discloses a V2X resource scheduling apparatus 70, where the V2X resource scheduling apparatus 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 a 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 at least based on said 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 direct link transmission resource of the direct link is determined only by the user equipment autonomously are avoided, the suitability for determining the transmission resource for the direct link is ensured, and the transmission efficiency of V2X is improved.
For more details of the operation principle and the operation mode of the V2X resource scheduling device 70, reference may be made to the relevant descriptions in fig. 1 to fig. 6, which are not described herein again.
The embodiment of the invention also discloses a storage medium, on which computer instructions are stored, and when the computer instructions are operated, the steps of the methods shown in fig. 1 to fig. 6 can be executed. The storage medium may include ROM, RAM, magnetic or optical disks, etc. The storage medium may further include a non-volatile (non-volatile) memory or a non-transient (non-transient) memory, etc.
The embodiment of the invention also discloses user equipment which can comprise a memory and a processor, wherein the memory is stored with 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, a mobile phone, a computer, a tablet computer and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for scheduling V2X resources, comprising:
receiving a downlink signaling from a base station, wherein the downlink signaling can indicate resource selection information;
determining direct link transmission resources for at least one direct link at least according to the resource selection information;
the resource selection information comprises a direct link index to which direct link transmission resources are applied, and the determining direct link transmission resources for at least one direct link according to at least the resource selection information comprises:
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 direct links corresponding to the direct link indexes;
and using the direct link transmission resource indicated by the downlink signaling for the determined direct link.
2. The V2X resource scheduling method of claim 1, wherein the resource selection information comprises an index of a destination device to which direct link transmission resources are applied, and wherein the determining direct link transmission resources for at least one direct link according to at least the resource selection information comprises:
determining target equipment according to a second mapping relation and the index of the target equipment, wherein the second mapping relation comprises the indexes of a plurality of target equipment and a plurality of corresponding target equipment;
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.
3. The V2X resource scheduling method of claim 1, wherein the resource selection information includes an RNTI employed for scrambling the downlink signaling, and wherein the determining the direct link transmission resource for the at least one direct link according to at least the resource selection information comprises:
decoding the downlink signaling by adopting different RNTIs, 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.
4. The V2X resource scheduling method of claim 1, wherein the resource selection information includes an application time domain location of direct link transmission resources, and wherein the determining direct link transmission resources for at least one direct link according to at least the resource selection information 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 suitable for the modulation coding parameters except the general modulation coding parameters, using the direct link transmission resources with the actual application time domain positions consistent with the application time domain positions for the first direct link.
5. The V2X resource scheduling method of claim 1, wherein said determining direct link transmission resources for at least one direct link based at least on said resource selection information comprises:
determining a universal RNTI, universal modulation coding parameters and link quality of each direct link;
and if the second direct link is determined to be suitable for the modulation coding parameters except the universal modulation coding parameters, using the direct link transmission resources indicated by the downlink signaling obtained by demodulating the RNTIs except the universal RNTI for the second direct link.
6. The V2X resource scheduling method of claim 1, wherein said determining direct link transmission resources for at least one direct link based at least on said resource selection information comprises:
determining a first direct link of the direct link transmission resource suitable for the downlink signaling indication according to the resource selection information and the link quality of the at least one direct link;
and if the number of the first direct links applicable to the same direct link transmission resource is multiple, determining a final direct link applicable to the same direct link transmission resource from multiple first direct links according to the service quality requirement of the V2X data transmitted by the at least one direct link.
7. The V2X resource scheduling method of claim 1, wherein the direct link transmission resource is a semi-static direct link transmission resource or a dynamic direct link transmission resource scheduled by a serving base station.
8. A V2X resource scheduling apparatus, comprising:
a downlink signaling receiving module, adapted to receive a downlink signaling from a base station, where 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 at least according to the resource selection information;
the resource selection information comprises a direct link index applied by direct link transmission resources, the resource scheduling module determines a direct link according to the direct link index and a third mapping relation, and the third mapping relation comprises a plurality of direct link indexes and a plurality of direct links corresponding to the direct link indexes; and using the direct link transmission resource indicated by the downlink signaling for the determined direct link.
9. A storage medium having stored thereon computer instructions, which when executed by a processor, perform the steps of the V2X resource scheduling method of any of claims 1 to 7.
10. A user equipment comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor when executing the computer instructions performs the steps of the V2X resource scheduling method of any of claims 1 to 7.
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