CN111294752A - V2X transmission candidate resource determination method and device, storage medium and user equipment - Google Patents
V2X transmission candidate resource determination method and device, storage medium and user equipment Download PDFInfo
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- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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Abstract
A V2X transmission candidate resource determination method and device, a storage medium and user equipment, wherein the V2X transmission candidate resource determination method comprises the following steps: determining a data packet to be sent from a high layer; determining an unmonitored subframe of current user equipment in a sensing window or a contention window; receiving SCI-R from first user equipment in a short sensing window or a competition window in the sensing window, wherein the SCI-R comprises SCI-R information sent by other user equipment sensed by the first user equipment; and determining occupied resources at least according to the SCI-R information and the positions of the unmonitored subframes, and eliminating the occupied resources in the resource selection window, wherein the rest resources in the resource selection window are candidate resources of the data packet to be sent. The technical scheme of the invention can avoid data transmission resource collision caused by the half-duplex problem in the NR V2X scene.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for determining V2X transmission candidate resources, a storage medium, and a user equipment.
Background
Vehicle-to-outside information exchange (V2X) in a Long Term Evolution (Long Term Evolution, LTE) system only supports periodic transmission services, and a sensing process in a resource selection process of LTE-V2X is designed based on the characteristic of periodic transmission. And the NR V2X supports both periodic transmission services and non-periodic transmission services, which results in that the resource selection method based on sensing in LTE-V2X is no longer applicable, so a new resource selection scheme needs to be designed.
A new agreement (element) is reached in RAN1#95 conference of 3GPP, which includes research on information obtained by decoding Side Control Indicator (SCI) and measurement of parameters related to a side link (SCI), and by designing information included in the SCI reasonably, a better sensing result can be obtained for resource selection. In several conferences before the 3GPP RAN1#95 conference, regarding resource selection of NR V2X, some companies have given a scheme to divide the sensing process in resource selection into two parts, each of which is performed in a different sensing window. According to the time length, the sensing window is divided into a long sensing window and a competition window, wherein the reserved information of periodic communication data is obtained mainly by decoding SCI in the long sensing window, so that the occupied resources are excluded from the resource selection window, and candidate transmission resources are obtained; and acquiring information of non-periodic transmission data mainly through SCI decoding or energy perception in a contention window, thereby excluding the part of occupied resources in a resource selection window. Both the Nokia scheme and the Ericsson introduce similar concepts of SCI-R and SCI-D, namely SCI in LTE-V is divided into two parts, the SCI-R only contains time-frequency domain indication information of resources occupied by SCI-D and DATA, and the SCI-R is transmitted in front of the SCI-D and DATA; the SCI-D, which contains other control information, is sent along with the DATA. The Ericsson scheme divides the resource selection scheme into two parts, the first part is used for selecting transmission resources of SCI-R, and the second part is used for selecting resources occupied by SCI-D and DATA.
However, under the NR V2X scenario, there may be half-duplex problems in aperiodic transmissions. For example, UE a has data transmission at a half-duplex subframe, and due to the half-duplex problem, UE a cannot receive resources transmitted by other UEs at this time, and if there is exactly other UE B transmitting the non-periodically transmitted SCI-R at this subframe at this time, UE a cannot exclude the resources occupied by UE B in the resource selection window, and a collision of resources may occur. In the first part of the resource selection window, i.e. the contention window, if two UEs send non-periodically transmitted SCI-rs on the same subframe, the half-duplex problem may also occur, and the UEs cannot avoid collision of DATA transmission resources by decoding SCI-rs sent by other UEs.
Disclosure of Invention
The technical problem solved by the invention is data transmission resource collision caused by the half-duplex problem under the NR V2X scene.
In order to solve the foregoing technical problem, an embodiment of the present invention provides a method for determining V2X transmission candidate resources, where the method for determining V2X transmission candidate resources includes: determining a data packet to be sent from a high layer; determining an unmonitored subframe of a current user equipment in a sensing window or a contention window, wherein the unmonitored subframe is a half-duplex subframe, the unmonitored subframe of the current user equipment in the sensing window transmits data, and the unmonitored subframe of the current user equipment in the contention window transmits data; receiving SCI-R from first user equipment in a short sensing window or a competition window in the sensing window, wherein the SCI-R comprises SCI-R information sent by other user equipment sensed by the first user equipment; and determining occupied resources at least according to the SCI-R information and the positions of the unmonitored subframes, and eliminating the occupied resources in the resource selection window, wherein the rest resources in the resource selection window are candidate resources of the data packet to be sent.
Optionally, the SCI-R information includes a subframe location where the aperiodic SCI-R is located and a time-domain distance between the subframe location and a data resource indicated by the aperiodic SCI-R.
Optionally, the determining occupied resources according to at least the SCI-R information and the position of the unmonitored subframe includes: determining a target SCI-R in the SCI-R information, wherein the position of the target SCI-R is the same as that of the subframe where the unmonitored subframe is located; and determining the occupied resources according to the time domain distance between the subframe position where the target SCI-R is located and the data resources indicated by the subframe position.
Optionally, the SCI-R includes SCI-R information sent by other user equipments that the first user equipment perceives within its SCI-R window.
Optionally, the position of the SCI-R window is determined according to the transmission subframe of the SCI-R.
Optionally, after determining the data packet to be sent from the higher layer, the method further includes: and determining the sub-frame of the data packet to be sent reaching the MAC layer.
Optionally, the time domain position of the short sensing window is selected from [ n-100, n-1], where n is a subframe where the data packet to be sent reaches the MAC layer.
Optionally, the determining occupied resources according to at least the SCI-R information and the position of the unmonitored subframe includes: determining non-periodic transmission resources in the resource selection window according to the SCI-R information and the position of the unmonitored subframe; receiving a periodic SCI (communication interface) sent by second user equipment in a long sensing window in the sensing window, and determining periodic transmission resources in the resource selection window according to the periodic SCI; determining the set of aperiodic transmission resources and periodic transmission resources as the occupied resources.
Optionally, after determining the data packet to be sent from the higher layer, the method further includes: and receiving the initial transmitted aperiodic SCI-R or the retransmitted aperiodic SCI-R of other at least one user equipment.
Optionally, the determining occupied resources according to at least the SCI-R information and the position of the unmonitored subframe includes: determining a first non-periodic transmission resource according to the SCI-R information and the position relation of the unmonitored subframes; determining the indicated data resource according to the received initial transmission aperiodic SCI-R or the retransmission aperiodic SCI-R to be used as a second aperiodic transmission resource; determining the set of the first aperiodic transmission resource and the second aperiodic transmission resource as the occupied resource.
In order to solve the above technical problem, an embodiment of the present invention further discloses a V2X transmission device, where the V2X transmission device includes: the data packet determining module is suitable for determining a data packet to be sent from a high layer; an unmonitored subframe determination module, adapted to determine an unmonitored subframe of a current user equipment in a sensing window or a contention window, where the unmonitored subframe is a half-duplex subframe, the unmonitored subframe of the current user equipment in the sensing window transmits data, and the unmonitored subframe of the current user equipment in the contention window is to transmit data; the SCI-R receiving module is suitable for receiving SCI-R from first user equipment in a short sensing window or a competition window in the sensing window, and the SCI-R comprises SCI-R information which is sensed by the first user equipment and sent by other user equipment; and the candidate resource determining module is suitable for determining occupied resources at least according to the SCI-R information and the positions of the unmonitored subframes, and eliminating the occupied resources in the resource selection window, wherein the rest resources in the resource selection window are candidate resources of the data packet to be sent.
In order to solve the above technical problem, an embodiment of the present invention further discloses a storage medium, on which computer instructions are stored, and the computer instructions execute the steps of the method for determining V2X transmission candidate resources when running.
In order to solve the above technical problem, an embodiment of the present invention further discloses a user equipment, which includes a memory and a processor, where the memory stores computer instructions executable on the processor, and the processor executes the steps of the V2X transmission candidate resource determination method when executing 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 can acquire SCI-R information sent by other user equipment by receiving the SCI-R from the first user equipment in the short sensing window or the competition window. Because the SCI-R information can indicate the subframe information of SCI-R sent by other user equipment and indicate resources in the resource selection window, resources occupied by other user equipment can be excluded from the candidate resources of the to-be-sent data packet through the unmonitored subframes (i.e., subframes where the half-duplex problem occurs) of the current user equipment and the SCI-R information, so that transmission resource collision caused by the half-duplex problem is avoided, the to-be-sent data packet can be transmitted in time, the data response speed is improved, and the user experience is further improved.
Further, in the resource selection window, the aperiodic SCI-R initially transmitted or the retransmitted aperiodic SCI-R of at least one other user equipment is received. The technical scheme of the invention can avoid the loss of the non-periodic SCI-R caused by the failure of receiving the data sent by the current user equipment in the half-duplex subframe by retransmitting the non-periodic SCI-R, ensure the receiving of the non-periodic SCI-R and further ensure the effectiveness of data transmission.
Drawings
Fig. 1 is a flowchart of a method for determining V2X transmission candidate resources according to an embodiment of the present invention;
FIG. 2 is a flowchart of one embodiment of step S104 shown in FIG. 1;
FIG. 3 is a flowchart of another embodiment of step S104 shown in FIG. 1;
FIG. 4 is a diagram illustrating an exemplary application scenario of an embodiment of the present invention;
FIG. 5 is a diagram illustrating another exemplary application scenario of an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a V2X transmission device according to an embodiment of the present invention.
Detailed Description
As described in the background, in the NR V2X scenario, there may be a half-duplex problem in aperiodic transmission, resulting in collision of DATA transmission resources.
The inventors of the present application have also found that the NR V2X supports both periodic and aperiodic traffic, and the method in LTE-V2X is no longer applicable to data that cannot be received due to the UE's own transmission time, because the method in LTE-V2X is designed according to the characteristics of periodic communication.
The technical scheme of the invention can acquire SCI-R information sent by other user equipment by receiving the SCI-R from the first user equipment in the short sensing window or the competition window. Because the SCI-R information can indicate the subframe information of SCI-R sent by other user equipment and indicate resources in the resource selection window, resources occupied by other user equipment can be excluded from the candidate resources of the to-be-sent data packet through the unmonitored subframes (i.e., subframes where the half-duplex problem occurs) of the current user equipment and the SCI-R information, so that transmission resource collision caused by the half-duplex problem is avoided, the to-be-sent data packet can be transmitted in time, the data response speed is improved, and the user experience is further improved.
SCI-R in the technical scheme of the invention is all called side control indication reservation information (sidelink control reservation).
The periodic SCI in the technical solution of the present invention may only include ordinary side Control Indicator Data (SCI-D), and the SCI-D includes other Control information. And only when a certain reservation period is not transmitted, SCI-R is sent to indicate the reserved resources of the next period, and the SCI-R only contains time-frequency domain indication information of resources occupied by SCI-D and DATA.
In the technical scheme of the invention, the contention window is a part of the resource selection window close to the receiving subframe of the data packet to be sent, and the current user equipment senses the resources in the contention window so as to determine the candidate resources. For example, the resource selection window is [ n +4, n +100], the contention window is [ n +4, n +40], and n is a subframe where the packet to be sent arrives at the MAC layer.
In the technical scheme of the invention, the unmonitored subframes in the contention window refer to half-duplex subframes in which the current user equipment is to send data. The data to be transmitted in the non-monitored subframe of the current user equipment in the contention window may be a data packet before the data packet to be transmitted, that is, a data packet with a receiving subframe before a receiving subframe of the data packet to be transmitted. Specifically, the size of the contention window may be determined according to candidate resources of the current user equipment after excluding occupied resources within the sensing window.
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 method for determining V2X transmission candidate resources according to an embodiment of the present invention.
The method for determining V2X transmission candidate resources shown in fig. 1 may include the following steps:
step S101: determining a data packet to be sent from a high layer;
step S102: determining an unmonitored subframe of a current user equipment in a sensing window or a contention window, wherein the unmonitored subframe is a half-duplex subframe, and the data is sent by the current user equipment in the unmonitored subframe in the sensing window. The current user equipment does not monitor the subframe in the contention window and is about to send data;
step S103: receiving SCI-R from first user equipment in a short sensing window or a competition window in the sensing window, wherein the SCI-R comprises SCI-R information sent by other user equipment sensed by the first user equipment;
step S104: and determining occupied resources at least according to the SCI-R information and the positions of the unmonitored subframes, and excluding the occupied resources in a resource selection window, wherein the rest resources in the resource selection window are candidate resources of the data packet to be sent.
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. For example, step S103 may be performed before step S101.
In a specific implementation, the types of subframes include half-duplex subframes and duplex subframes. The user equipment can transmit or receive data in a subframe of which the type is a half-duplex subframe; the user equipment may transmit and receive data in subframes of the type duplex subframes.
Since the current ue has sent data in the unmonitored subframe, the current ue cannot receive data in the unmonitored subframe, and the current ue may miss SCI-rs sent by other ues in the unmonitored subframe.
In this embodiment, an unmonitored subframe may be determined, and the unmonitored subframe may be located in a sensing window or a contention window.
In a specific implementation, the current ue may receive the SCI-R sent by the first ue. The SCI-R of the first user equipment may include SCI-R information transmitted by other user equipment as perceived by the first user equipment, in addition to the time-frequency domain indication information of the resources occupied by SCI-D and DATA.
In a specific implementation, the current ue determines a data packet to be sent from a higher layer in a current subframe. At this time, the current ue needs to send the SCI-R to indicate the resource occupied by the data packet to be sent, so that the resource available to the SCI-R in the resource selection window and the resource available to the data packet to be sent in the resource selection window need to be determined.
It is to be understood that the size of the resource selection window may be determined according to the candidate resource of the current user equipment after excluding the occupied resource in the sensing window. Meanwhile, in order to meet the delay requirement, for example, according to the maximum delay requirement of 100 milliseconds, the maximum resource selection window may be [ N + N1, N +100], N is a receiving subframe of a data packet to be transmitted, N1 is a positive integer greater than 1, and the size of N1 may be set according to the capability of the current user equipment to process the data packet to be transmitted.
In specific implementation, SCI-R which is not received by the current user equipment can be determined through SCI-R information and non-monitored subframes, and occupied resources of other user equipment in a resource selection window can be determined by using the non-received SCI-R. By excluding the occupied resources, candidate resources for the data packet to be sent can be determined. The candidate resources of the data packet to be sent may include resources available for sending the data packet to be sent and resources available when the SCI-R corresponding to the data packet to be sent is sent, where the SCI-R corresponding to the data packet to be sent can indicate a resource location of the data packet to be sent.
The embodiment of the invention can acquire SCI-R information sent by other user equipment by receiving the SCI-R from the first user equipment in the short sensing window or the competition window. Because the SCI-R information can indicate the subframe information of SCI-R sent by other user equipment and indicate resources in the resource selection window, resources occupied by other user equipment can be excluded from the candidate resources of the to-be-sent data packet through the unmonitored subframes (i.e., subframes where the half-duplex problem occurs) of the current user equipment and the SCI-R information, so that transmission resource collision caused by the half-duplex problem is avoided, the to-be-sent data packet can be transmitted in time, the data response speed is improved, and the user experience is further improved.
In a non-limiting embodiment of the present invention, the SCI-R information includes a subframe location where the aperiodic SCI-R is located and a time-domain distance between the subframe location and a data resource indicated by the aperiodic SCI-R.
In this embodiment, the SCI-R of the first ue includes a subframe location where the aperiodic SCI-R of the other ue is located and a time-domain distance between the subframe location and the data resource indicated by the aperiodic SCI-R. In particular, the distance is in subframes.
In one non-limiting embodiment, the SCI-R of the first user equipment includes several groups L, X. Wherein, L represents the distance between SCI-R and corresponding DATA sent by other UE and perceived by the first user equipment; x denotes the subframe position of SCI-R transmitted by other UEs as perceived by the first user equipment.
For example, for the SCI-R sent by UE B received by UE A, the SCI-R sent by UE B includes [20,1] for UE C and [60,1] for UE D.
In a non-limiting embodiment of the present invention, referring to fig. 2, step S104 shown in fig. 1 may include the following steps:
step S201: determining a target SCI-R in the SCI-R information, wherein the position of the target SCI-R is the same as that of the subframe where the unmonitored subframe is located;
step S202: and determining the occupied resources according to the time domain distance between the subframe position where the target SCI-R is located and the data resources indicated by the subframe position.
In specific implementation, the subframe in which the target SCI-R is located and the unmonitored subframe are the same subframe. For example, if the SCI-R1 in the SCI-R information is located in subframe 1, the SCI-R2 in the SCI-R information is located in subframe 2, and the unmonitored subframe is subframe 1, it is determined that SCI-R1 is the target SCI-R.
And determining the occupied resources according to the time domain distance between the subframe position where the target SCI-R is located and the data resources indicated by the subframe position. For example, if the target SCI-R is located in subframe 1 of radio frame 0 and the distance is 20, it is determined that the occupied resource is subframe 1 of radio frame 2.
In a non-limiting embodiment of the present invention, the SCI-R includes SCI-R information sent by other user equipment that the first user equipment perceives within its SCI-R window.
In particular implementations, the SCI-R window (window) represents a sensing window in which the first user equipment senses SCI-R transmitted by other UEs. The SCI-R information sent by the other user equipment is perceived by the first user equipment in the SCI-R window.
It should be noted that the size of the SCI-R window may be configured according to an actual application scenario, for example, the SCI-R window may be 5 subframes, which is not limited in this embodiment of the present invention.
Further, the position of the SCI-R window is determined according to the sending subframe of the SCI-R.
Specifically, there may be a preset offset (offset) between the SCI-R window and the subframe in which the SCI-R of the first user equipment is located. The preset offset may be a fixed small value, for example, 1 subframe; the size of the preset offset may be determined by the first user equipment's ability to process the sensing data in the SCI-R window until sending its SCI-R.
In one non-limiting embodiment of the present invention, step S101 shown in fig. 1 may include the following steps: and determining the sub-frame of the data packet to be sent reaching the MAC layer.
The received subframes of the data packet to be transmitted may be used to determine the size of the sensing window.
In a specific embodiment, the long sensing window is located at a time domain position selected from [ n-1000, n-1], where n is a subframe where the data packet to be transmitted arrives at the MAC layer. The long sensing window may also be referred to as a periodic communication sensing window.
In a specific embodiment, the short sensing window is located at a time domain position selected from [ n-100, n-1], where n is a subframe where the data packet to be transmitted arrives at the MAC layer. The short sensing window may also be referred to as an aperiodic communication sensing window.
Specifically, because the distance from the sub-frame where the SCI-R is located to the DATA resource needs to meet the delay requirement, the sub-frame where the SCI-R is located, which may occupy the resource in the resource selection window and is transmitted non-periodically, is only close to a part of the received sub-frame n in the sensing window, and the short sensing window size may be set to [ n-100, n-1] according to the maximum delay requirement of 100 ms.
In a non-limiting embodiment of the present invention, referring to fig. 3, step S104 shown in fig. 1 may include the following steps:
step S301: determining non-periodic transmission resources in the resource selection window according to the SCI-R information and the position of the unmonitored subframe;
step S302: receiving a periodic SCI (communication interface) sent by second user equipment in a long sensing window in the sensing window, and determining periodic transmission resources in the resource selection window according to the periodic SCI;
step S303: determining the set of aperiodic transmission resources and periodic transmission resources as the occupied resources.
As for a specific implementation of step S301, reference may be made to step S201 to step S202 shown in fig. 2. That is, in the present embodiment, the aperiodic transmission resource can be determined by performing step S201 to step S202. The aperiodic transmission resource refers to a resource occupied by the V2X aperiodic transmission service in the resource selection window.
Since there may be non-periodic transmission traffic and periodic transmission traffic in the NR V2X scenario, in the specific implementation of step S302, the periodic transmission resource in the resource selection window may also be determined according to the periodic SCI sent from the second ue within the long sensing window. The periodic transmission resource refers to a resource occupied by the V2X periodic transmission service in the resource selection window.
It should be understood by those skilled in the art that the periodic transmission resource may be determined in a manner of processing of LTE-V2X. For the specific process of determining the periodic transmission resource according to the processing manner of LTE-V2X, reference may be made to an existing standard protocol, and details of the embodiment of the present invention are not described herein again.
Further in the implementation of step S303, it is determined that the occupied resources are a set of aperiodic transmission resources and the periodic transmission resources.
In a preferred embodiment of the present invention, step S101 shown in fig. 1 may include the following steps: and receiving the initial transmitted aperiodic SCI-R or the retransmitted aperiodic SCI-R of other at least one user equipment.
Specifically, the resource occupied by the initial transmission aperiodic SCI-R and the retransmission aperiodic SCI-R may be a non-intersecting fixed-size resource within a short sensing window or a contention window, and may be, for example, a symbol (symbol) or a Resource Element (RE).
Specifically, referring to fig. 4, the time domain distance between the subframe where the initial transmitted aperiodic SCI-R is located and the left boundary of the short sensing window or the contention window is T1, the time domain distance between the subframe where the retransmitted aperiodic SCI-R is located and the subframe where the initial transmitted aperiodic SCI-R is located is T2, and the frequency domain distance between the subframe where the retransmitted aperiodic SCI-R is located and the subframe where the initial transmitted aperiodic SCI-R is located is T3. Among them, T1, T2, T3 may be randomly selected within a preset range of values, which is related to the number of candidate resources of the contention window.
For example, the UE1 randomly selects two transmission resources (denoted by reference numeral 1) among the candidate resources to send SCI-R, first selects the initial transmission SCI-R resource according to T1 ═ 2, and then selects the retransmission SCI-R resource according to T2 ═ 2 and T3 ═ 4. At this time, the UE2 selects two SCI-R transmission resources (denoted by reference numeral 2) in the same procedure as the UE1, as shown in FIG. 4. Because T1/T2/T3 are both based on randomized selection, the probability of complete coincidence of the two SCI-Rs of UE1 and UE2 in a time unit can be reduced to a low level, thereby reducing half-duplex problems.
In this embodiment, the retransmitted aperiodic SCI-R may be sent randomly. The probability that SCI-Rs sent by different UEs are completely overlapped in a time unit can be reduced by randomly sending the SCI-Rs for multiple times by other at least one user equipment, so that the half-duplex problem is reduced to a certain extent.
The embodiment of the invention can avoid the loss of the non-periodic SCI-R caused by the failure of receiving the data sent by the current user equipment in the half-duplex subframe by retransmitting the non-periodic SCI-R, ensure the receiving of the non-periodic SCI-R and further ensure the effectiveness of data transmission.
Further, step S104 shown in fig. 1 may include the following steps: determining a first non-periodic transmission resource according to the SCI-R information and the position relation of the unmonitored subframes; determining the indicated data resource according to the received initial transmission aperiodic SCI-R or the retransmission aperiodic SCI-R to be used as a second aperiodic transmission resource; determining the set of the first aperiodic transmission resource and the second aperiodic transmission resource as the occupied resource.
That is, the current UE determines the occupied resources according to all SCI-Rs it receives. In this embodiment, all the SCI-rs received by the current ue include SCI-rs of other ues in the SCI-R information and the initially transmitted aperiodic SCI-R or the retransmitted aperiodic SCI-R. The occupied resources are determined by the data resources indicated by all SCI-R.
In a typical application scenario of the present invention, please refer to fig. 5, where the upper diagram in fig. 5 is time domain information of UE B, and the lower diagram is time domain information of UE a.
Referring to the upper diagram of FIG. 5, UE B senses the SCI-R of UE C (diagonal filler in the figure) and the SCI-R of UE D (grid filler in the figure) in subframe m-1. UE B sends its SCI-R out in subframe m-4.
Referring to the lower diagram of fig. 5, UE a receives a data packet to be transmitted from a higher layer in subframe n. When UE A excludes occupied resources in a resource selection window through SCI-R of other UE, because the distance from the SCI-R to DATA needs to meet the delay requirement, the SCI-R which may occupy the resources in the resource selection window and is transmitted in a non-periodic mode only approaches a part of a subframe n in the sensing window, and the size of the short sensing window can be set to [ n-100, n-1] according to the maximum delay requirement of 100 ms.
UE A determines that the unmonitored subframe within the sensing window is n-5, that is, subframe n-5 is a half-duplex subframe and UE A has transmitted data in subframe n-5. Thus, UE A may miss receiving the SCI-R of other UEs at subframe n-5, the SCI-R of other UEs may occupy resources in the resource selection window, and UE A needs to exclude this part of resources in the resource selection window.
The SCI-R sent by UE B falls within the sensing window (i.e., [ n-100, n-1]) of UE A, which receives the SCI-R of UE B in subframe n-1 (corresponding to subframe m-4). The unmonitored subframe n-5 of UE a is located within the SCI-R window of UE B, so UE a can obtain 2 sets [ L, X ] in SCI-R by decoding the SCI-R sent by UE B, as shown in fig. 5, where 2 sets [ L, X ] are [60,1] and [20,1] respectively, and correspond to the parameters of UE C and UE D in half-duplex subframe n-5 of UE a, respectively. A preset offset is provided between the SCI-R window of the UE B and the transmission subframe of the SCI-R of the UE B.
UE A finds the [ L, X ] value that falls exactly on UE A's half-duplex subframe n-5 through 2 sets [ L, X ], such as the half-duplex subframe n-5 that is exactly on UE A for the SCI-R of UE C and UE D of FIG. 5. The UE A excludes the resources (diagonal filling parts in the figure) occupied by the UE C and the resources (grid filling parts in the figure) occupied by the UE D in the resource selection window according to [60,1] and [20,1], and obtains a candidate resource set.
In another exemplary application scenario of the present invention, with continued reference to fig. 5, the unmonitored subframes may also be located in the contention window. For the non-monitored subframes in the contention window, the candidate resources may also be determined by using the method in the foregoing embodiment, which is not described herein again.
In still another exemplary application scenario of the present invention, with continued reference to FIG. 5, unlike the previous embodiment, since UE A can also sense the SCI-R of other UEs within the contention window (i.e., [ n +4, n +40]), UE A can receive the SCI-R of UE B within the contention window. A preset offset is provided between the SCI-R window of the UE B and the transmission subframe of the SCI-R of the UE B.
In another typical application scenario of the present invention, before receiving the SCI-R of the UE B, the UE a may also exclude the resource that may be reserved in the resource selection window for the periodic transmission service sensed in the long sensing window [ n-1000, n-1] according to the LTE-V2X resource selection process. For the determination of the resources that may be reserved in the resource selection window for the periodic transmission service, reference may be made to the prior art, and details are not described herein again.
Referring to fig. 6, the V2X transmission device 60 may include: a packet determination module 601, an unmonitored subframe determination module 602, an SCI-R reception module 603, and a candidate resource determination module 604.
The data packet determining module 601 is adapted to determine a data packet to be sent from a higher layer; the unmonitored subframe determining module 602 is adapted to determine an unmonitored subframe of a current user equipment in a sensing window or a contention window, where the unmonitored subframe is a half-duplex subframe, the current user equipment has transmitted data in the unmonitored subframe in the sensing window, and the current user equipment is to transmit data in the unmonitored subframe in the contention window; the SCI-R receiving module 603 is adapted to receive an SCI-R from a first user equipment in a short sensing window or a contention window within the sensing window, where the SCI-R includes SCI-R information transmitted by other user equipments sensed by the first user equipment; the candidate resource determining module 604 is adapted to determine occupied resources according to at least the SCI-R information and the positions of the unmonitored subframes, and exclude the occupied resources from the resource selection window, where the remaining resources in the resource selection window are candidate resources of the data packet to be sent.
The embodiment of the invention can acquire SCI-R information sent by other user equipment by receiving the SCI-R from the first user equipment in the short sensing window or the competition window. Because the SCI-R information can indicate the subframe information of SCI-R sent by other user equipment and indicate resources in the resource selection window, resources occupied by other user equipment can be excluded from the candidate resources of the to-be-sent data packet through the unmonitored subframes (i.e., subframes where the half-duplex problem occurs) of the current user equipment and the SCI-R information, so that transmission resource collision caused by the half-duplex problem is avoided, the to-be-sent data packet can be transmitted in time, the data response speed is improved, and the user experience is further improved.
For more details of the operation principle and the operation mode of the V2X transmission device 60, reference may be made to the relevant descriptions in fig. 1 to fig. 5, which are not repeated herein.
The embodiment of the invention also discloses a storage medium, wherein computer instructions are stored on the storage medium, and when the computer instructions are operated, the steps of the method shown in the figure 1, the figure 2 or the figure 3 can be executed. The storage medium may include ROM, RAM, magnetic or optical disks, etc. The storage medium may further include a non-volatile memory (non-volatile) or a non-transitory memory (non-transient), and the like.
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, fig. 2, or fig. 3. The user equipment includes but is not limited to a mobile phone, a computer, a tablet computer and other terminal equipment.
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 (13)
1. A method for determining V2X transmission candidate resources, comprising:
determining a data packet to be sent from a high layer;
determining an unmonitored subframe of a current user equipment in a sensing window or a contention window, wherein the unmonitored subframe is a half-duplex subframe, the unmonitored subframe of the current user equipment in the sensing window transmits data, and the unmonitored subframe of the current user equipment in the contention window transmits data;
receiving SCI-R from first user equipment in a short sensing window or a competition window in the sensing window, wherein the SCI-R comprises SCI-R information sent by other user equipment sensed by the first user equipment;
and determining occupied resources at least according to the SCI-R information and the positions of the unmonitored subframes, and excluding the occupied resources in a resource selection window, wherein the rest resources in the resource selection window are candidate resources of the data packet to be sent.
2. The method of claim 1, wherein the SCI-R information comprises a subframe location where an aperiodic SCI-R is located and a time-domain distance between the subframe location and a data resource indicated by the aperiodic SCI-R.
3. The method of claim 2 wherein the determining occupied resources based at least on the SCI-R information and the location of the unmonitored subframe comprises: determining a target SCI-R in the SCI-R information, wherein the position of the target SCI-R is the same as that of the subframe where the unmonitored subframe is located;
and determining the occupied resources according to the time domain distance between the subframe position where the target SCI-R is located and the data resources indicated by the subframe position.
4. The V2X transmission candidate resource determination method of claim 1, wherein the SCI-R includes SCI-R information sent by other user equipments that the first user equipment perceives within its SCI-R window.
5. The method of claim 4 wherein the SCI-R window is located at a position determined according to a transmission subframe of the SCI-R.
6. The method for determining V2X transmission candidate resources according to claim 1, wherein the determining the data packet to be sent from the higher layer further comprises:
and determining the sub-frame of the data packet to be sent reaching the MAC layer.
7. The method for determining V2X transmission candidate resources according to claim 6, wherein the short sensing window is located at a time domain position selected from [ n-100, n-1], where n is a subframe where the packet to be sent arrives at the MAC layer.
8. The method of claim 1, wherein the determining occupied resources based at least on the SCI-R information and the location of the unmonitored subframe comprises: determining non-periodic transmission resources in the resource selection window according to the SCI-R information and the position of the unmonitored subframe;
receiving a periodic SCI (communication interface) sent by second user equipment in a long sensing window in the sensing window, and determining periodic transmission resources in the resource selection window according to the periodic SCI;
determining the set of aperiodic transmission resources and periodic transmission resources as the occupied resources.
9. The method for determining V2X transmission candidate resources according to claim 1, wherein the determining the data packet to be sent from the higher layer further comprises:
and receiving the initial transmitted aperiodic SCI-R or the retransmitted aperiodic SCI-R of other at least one user equipment.
10. The V2X transmission candidate resource determining method of claim 9 wherein the determining occupied resources based at least on the SCI-R information and the location of the unmonitored subframes comprises: determining a first non-periodic transmission resource according to the SCI-R information and the position relation of the unmonitored subframes;
determining the indicated data resource according to the received initial transmission aperiodic SCI-R or the retransmission aperiodic SCI-R to be used as a second aperiodic transmission resource;
determining the set of the first aperiodic transmission resource and the second aperiodic transmission resource as the occupied resource.
11. An apparatus for determining V2X transmission candidate resources, comprising:
the data packet determining module is suitable for determining a data packet to be sent from a high layer;
an unmonitored subframe determination module, adapted to determine an unmonitored subframe of a current user equipment in a sensing window or a contention window, where the unmonitored subframe is a half-duplex subframe, the unmonitored subframe of the current user equipment in the sensing window transmits data, and the unmonitored subframe of the current user equipment in the contention window is to transmit data;
the SCI-R receiving module is suitable for receiving SCI-R from first user equipment in a short sensing window or a competition window in the sensing window, and the SCI-R comprises SCI-R information which is sensed by the first user equipment and sent by other user equipment;
and the candidate resource determining module is suitable for determining occupied resources at least according to the SCI-R information and the positions of the unmonitored subframes, and eliminating the occupied resources in a resource selection window, wherein the rest resources in the resource selection window are candidate resources of the data packet to be sent.
12. A storage medium having stored thereon computer instructions, wherein said computer instructions when executed perform the steps of the V2X transmission candidate resource determination method of any one of claims 1-10.
13. A user equipment comprising a memory and a processor, said memory having stored thereon computer instructions executable on said processor, wherein said processor when executing said computer instructions performs the steps of the V2X transmission candidate resource determination method of any of claims 1-10.
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