Resource exclusion method and apparatus for monitoring side link control information (SCI).

Abstract

Embodiments of the present disclosure provide a resource exclusion method and apparatus for monitoring sidelink control information (SCI). The method includes: a first LTE-V2X terminal monitors SCI transmitted by a second LTE-V2X terminal within a sensing window; for each available downlink subframe, the first LTE-V2X terminal decodes current sidelink control information (SCI), obtains resource reservation information of the second LTE-V2X terminal based on the scheduling type and transmission type of the current SCI, and performs exclusion of candidate available resources in a future resource selection window based on the resource reservation information.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the field of communications, and specifically, to a resource exclusion method and apparatus for monitoring sidelink control information SCI.

Background Art

[0002] C-V2X is an abbreviation of Cellular-V2X, that is, V2X based on a cellular network. V2X (Vehicle to Everything) refers to data communication between vehicles and between vehicles and other devices, and can be applied to a series of scenarios such as road safety, autonomous driving, advanced driver assistance systems, road condition perception, and mobility services.

[0003] LTE-V2X and NR-V2X are currently side communication standards that support two V2X services created by 3GPP. In LTE-V2X, in a scenario not covered by a cellular network, a terminal supports a method of autonomously selecting a transmission resource. On the other hand, in the process of autonomously selecting a future resource, it is necessary to perform polling and judgment on the monitoring result of a history awareness window, which involves a large number of loop nests and conditional judgments in the implementation process, and higher requirements are imposed on symbol-level sequence processing.

[0004] Currently, in many conventional implementation solutions, one is to improve the efficiency of autonomously selecting a resource by a method of exchanging space for time, and the other is to improve the efficiency of autonomously selecting a resource by a method of exchanging time for space. However, neither of these two methods can reduce the complexity of an LTE-V2X terminal transmitting side awareness window SCI monitoring resource selection, so the degree of improving the efficiency of selecting a resource is limited.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The embodiments of this disclosure provide a resource exclusion method and apparatus for monitoring sidelink control information SCI, which at least solve the problem in related technologies where the complexity of LTE-V2X terminals transmitting sidelink sensing window SCI monitoring resource selection limits the extent to which the efficiency of resource selection can be improved. [Means for solving the problem]

[0006] According to one embodiment of the present disclosure, a resource exclusion method for monitoring sidelink control information SCI is provided, comprising: a first LTE-V2X terminal monitoring SCI transmitted by a second LTE-V2X terminal within a sensing window; decoding the current sidelink control information SCI for each subframe available for downlink; obtaining resource reservation information of the second LTE-V2X terminal based on the scheduling type and transmission type of the current SCI; and excluding available resources in a future resource selection window based on the resource reservation information.

[0007] Another embodiment of the present disclosure provides a resource exclusion device for monitoring sidelink control information SCI, wherein a first LTE-V2X terminal monitors SCI transmitted by a second LTE-V2X terminal within a sensing window, and for each subframe available for downlink, the first LTE-V2X terminal includes a decoding module configured to decode the current sidelink control information SCI, an acquisition module configured to acquire resource reservation information of the second LTE-V2X terminal based on the scheduling type and transmission type of the current SCI, and an exclusion module configured to exclude available resources in a future resource selection window based on the resource reservation information.

[0008] Another embodiment of the present disclosure further provides a computer-readable storage medium in which a computer program is stored, which is configured to perform the steps of any one of the method embodiments described above when it is executed.

[0009] Another embodiment of the present disclosure further provides an electronic device comprising a memory in which a computer program is stored, and a processor configured to execute the computer program and perform the steps in any one of the method embodiments described above. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic diagram of the application environment for the resource exclusion method for monitoring sidelink control information SCI according to an embodiment of the present disclosure. [Figure 2] This is a flowchart of a resource exclusion method for monitoring side link control information SCI according to an embodiment of the present disclosure. [Figure 3-1] This is a schematic diagram illustrating an application scenario of the resource exclusion method for monitoring sidelink control information (SCI) according to an embodiment of the present disclosure. [Figure 3-2] This is a schematic diagram illustrating an application scenario of the resource exclusion method for monitoring sidelink control information (SCI) according to an embodiment of the present disclosure. [Figure 4] This is a schematic diagram illustrating an application scenario of the resource exclusion method for monitoring sidelink control information (SCI) according to an embodiment of the present disclosure. [Figure 5] This is a flowchart of the SPS-type SCI resource exclusion in the resource exclusion method for monitoring sidelink control information SCI according to an embodiment of the present disclosure. [Figure 6] This is a flowchart of the EVENT-type SCI resource exclusion in the resource exclusion method for monitoring sidelink control information SCI according to an embodiment of the present disclosure. [Figure 7] This is a structural block diagram of a resource exclusion device for monitoring side link control information SCI according to an embodiment of the present disclosure. [Modes for carrying out the invention]

[0011] The embodiments of this disclosure will be described in detail below with reference to the drawings and based on the examples.

[0012] Furthermore, terms such as "first," "second," etc., used in the specification, claims, and drawings of this disclosure are used to distinguish similar subjects and do not need to be used to describe a specific order or sequence.

[0013] The terms used in the embodiments of this invention are explained below. UE: User Equipment. CBR: Channel Busy Rate. MCS: Modulation and Coding Scheme. RSRP: Reference Signal Received Power. SL-RSRP: Sidelink-REReference Signal Received Power. SCI: SideLink Control Information. RIV: Resource Indication Value. SPS: Semi-Persistent Scheduling.

[0014] PSSCH: Physical Sidelink Shared Channel. PSCCH: Physical Sidelink Control Channel. TB: Transmission Block, data transmission block.

[0015] Method embodiments according to embodiments of the present disclosure can be executed on a mobile terminal, a computer terminal, or a similar computing device. Taking the case of being executed on a mobile terminal as an example, FIG. 1 is a hardware structure block diagram of a mobile terminal for a resource exclusion method of monitoring sidelink control information (SCI) according to embodiments of the present disclosure.

[0016] As shown in FIG. 1, the mobile terminal may include one or more (only one is shown in FIG. 1) processors 102 (the processor 102 may include, but is not limited to, a processing device such as a microcontroller unit (MCU) or a field programmable gate array (FPGA)), and a memory 104 for storing data. Here, the mobile terminal may further include a transmission device 106 used for communication functions and an input / output device 108.

[0017] As can be understood by those skilled in the art, the structure shown in FIG. 1 is merely schematic and does not limit the structure of the mobile terminal. For example, the mobile terminal may further include more or fewer components than those shown in FIG. 1, or may have an arrangement different from that shown in FIG. 1.

[0018] The memory 104 can be used to store a computer program, for example, a software program and modules of application software, and a computer program corresponding to the resource exclusion method for monitoring sidelink control information (SCI) in embodiments of the present disclosure. The processor 102 executes the computer program stored in the memory 104 to perform various functional applications and data processing, that is, to implement the above method. The memory 104 may include high-speed random access memory and may further include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memories.

[0019] In some embodiments, the memory 104 may further include a memory installed remotely from the processor 102, and these remote memories may be connected to the mobile terminal via a network. Examples of the above network include, but are not limited to, the Internet, intranet, local area network, mobile communication network, and combinations thereof.

[0020] The transmission device 106 is used to receive or transmit data via one network. Specific examples of the above network may include a wireless network provided by a communication supplier of the mobile terminal. In one embodiment, the transmission device 106 includes a network adapter (abbreviated as Network Interface Controller, NIC), which can be connected to other network devices by a base station and communicate with the Internet. In one embodiment, the transmission device 106 may be a radio frequency (RF) module and is used to communicate with the Internet in a wireless manner.

[0021] In this embodiment, a resource exclusion method for monitoring side link control information SCI is provided. FIG. 2 is a flowchart according to an embodiment of the present disclosure. As shown in FIG. 2, the flow includes that the first LTE-V2X terminal monitors the SCI transmitted by the second LTE-V2X terminal within a sensing window, and for each downlink available subframe, the first LTE-V2X terminal decodes the current side link control information SCI in step S202, obtains the resource reservation information of the second LTE-V2X terminal based on the scheduling type and transmission type of the current SCI in step S204, and performs resource exclusion of candidate available resources in a future resource selection window based on the resource reservation information in step S206.

[0022] The first LTE-V2X terminal is not limited to a local terminal, and the second LTE-V2X terminal is not limited to a peer terminal transmitting data. Based on the SCI scheduling type and transmission type, resource reservation information used for data transmission by the local terminal to the peer terminal is determined, thereby excluding available resources in future resource selection windows.

[0023] The potential available resources for the future resource selection window are not limited to resources reserved by the current resource selection window and determined based on the current resource selection window when the first LTE-V2X terminal and the second LTE-V2X terminal interact. Instead, resources that are already occupied are excluded, thereby determining resources that are not reserved and can be occupied by the future resource selection window. Excluding potential available resources for the future resource selection window reduces the complexity of resource selection for the terminals, alleviates the time-series pressure in the terminal's resource selection subframe, and reduces the impact on the resource selection process.

[0024] In this embodiment, resource reservation information of the terminal is obtained based on the current SCI scheduling type and transmission type. Based on the resource reservation information, it is possible to exclude candidate resources available in the future resource selection window, realize SCI monitoring exclusion of sensing windows, and provide a set of candidate resources available for local side-up transmission. This effectively solves the problems of exclusion redundancy and exclusion omissions, solves the problem in related technologies where the complexity of LTE-V2X terminals transmitting sensing window SCI monitoring resource selections on the side limits the degree to which resource selection efficiency can be improved, and realizes the technical effect of improving resource selection efficiency.

[0025] In one preferred embodiment, after the first LTE-V2X terminal decodes the side-2 link control information SCI, the first LTE-V2X terminal determines the scheduling type of the current SCI of the second LTE-V2X terminal based on the resource reservation period range obtained by decoding the current SCI, wherein the scheduling type includes periodic and event-based types.

[0026] When considering both spatial and temporal overhead simultaneously, the sensing process makes judgments and rejections regarding redundant SCI data results based on the V2X transmission characteristics. Based on the resource reservation information characteristics of the SCI, the SCIs monitored in the sensing window are distinguished into two scheduling types according to the resource reservation period. One is a periodic SCI, i.e., an SPS (semi-persistent scheduling periodicity) type SCI, which requires periodic reservation of time-frequency resources, and the other is an event-type SCI, i.e., an EVENT (event-type scheduling eventiness) type SCI, which reserves time-frequency resources for at most two transmissions: the initial transmission and the retransmission. The transmission type is not limited to including the initial transmission and the retransmission. The initial transmission indicates that this is the first transmission, and the retransmission indicates that this is the second transmission.

[0027] During the transmission of an event-type SCI, the transmission interval between the initial transmission and retransmission is 15 logical subframes or less, and based on the characteristics of the subframes available in the resource pool, an absolute number of 64 or fewer subframes (in ms) can be calculated. This means that, within the T / ms sensing window, the opposing terminal of the local terminal's future resource selection window is likely to be reserved at least for the time period of T' / ms (T'<=64ms) at the end of the sensing window, and opposing terminals in the remaining time period are already in historical transmission and simply serve as a reference index for the local terminal's channel busy rate.

[0028] Therefore, two types of SCI decoding information data can be stored separately: one as the T / ms sensing window for SPS-type SCIs and the other as the T' / ms sensing window for EVENT-type SCIs. From the perspective of the vertical dimension of space, this greatly reduces storage space, and from the perspective of the horizontal dimension of time, it greatly reduces the traverse search process for the two types of SCI reserved resources. Based on the above classification, for each monitoring subframe, pre-history resource exclusion is performed after monitoring the SCI.

[0029] For an SPS-type SCI received by a sensing window, there are two possible scenarios. One is that there is at least one complete periodic transmission result, i.e., both the initial transmission and retransmission are located within the sensing window, and the other is that there is no complete periodic transmission result, i.e., neither the initial transmission nor the retransmission is located within the sensing window.

[0030] Let's explain Scene 1 in detail. As shown in Figure 3-1, the latest cycle m+4 of the opposing terminal UE has already completed the transmission of the initial and retransmissions. In the sensing process, the local UE monitors the initial and retransmissions at the corresponding time-frequency position. In this scene, it is not limited to rolling back to the time-frequency position of the initial transmission to make a decision, but only the SCI result of the initial transmission position of the latest cycle is saved as the basis for excluding future resource reservations for the opposing terminal UE, and there is no need to repeatedly reject the transmission SCI results and historically retransmitted SCI results of the remaining cycles.

[0031] As shown in Figure 3-2, the latest cycle m+4 of the opposing terminal UE has completed transmitting only the initial transmission, and the retransmission is in the future resource selection window. In this case, the initial transmission SCI result of the latest cycle is used as the basis for excluding the resource from the future resource reservation of the opposing terminal UE. The essential difference from the periodic transmission of the opposing terminal UE in Figure 3-1 is that it is necessary to exclude the retransmission of the current cycle m+4 from entering the future resource selection window, thereby preventing resource selection failure or transmission failure due to omission.

[0032] Let's explain Scene 2 in detail. As shown in Figure 4, there is no complete periodic transmission result within the sensing window, and given the complex channel conditions, the possibility of initial transmission failure by the opposing terminal UE cannot be ruled out. In this scene, in order to prevent the resource exclusion result from becoming uncertain due to over-exclusion of sensing window SCIs, each time an SCI is received and retransmission is instructed, it is necessary to roll back to the corresponding time-frequency position based on the logical subframe offsets of the initial and retransmission to search whether the same SCI initial transmission result exists. If it does not exist, the current retransmission SCI result must be retained, thereby ensuring the validity of the SCI results within the sensing window.

[0033] In one preferred embodiment, obtaining resource reservation information for a second LTE-V2X terminal based on the scheduling type and transmission type of the current SCI further includes S11 determining the transmission type of the current SCI if the scheduling type of the current SCI is periodic, S12 storing the data structure of the current SCI if the transmission type of the current SCI is initial transmission, and S13 determining whether the resource occupancy position of the current SCI is the same as the resource occupancy of the historical SCI and obtaining resource reservation information.

[0034] Based on the retransmission instructions in the current decoded SCI information, the current transmission type (initial transmission or retransmission) and the time-frequency position are determined.

[0035] If the current transmission type is determined to be an initial transmission, the initial transmission start subchannel index and the contiguous subchannel length occupied in the SCI information are converted into a logical subframe offset based on the current resource reservation period. A query is then performed to see if the same PSSCH and PSCCH (or PSSCH) exist at the corresponding subchannel position in the previous period, offsetting them earlier. If they do exist, it means that the initial transmission result for the current period clears the SCI result of the subframe offset earlier, and the SCI result of the initial transmission subframe for the current period is retained.

[0036] If it is determined that the current transmission type is a retransmission, the same query decision as for the initial transmission is performed, and based on the logical subframe offsets for the initial and retransmissions, a query is performed to determine whether an initial transmission for that position has been received from the opposing terminal by offsetting it earlier to the initial transmission position of the current cycle. If an initial transmission for that position has been received from the opposing terminal, the current retransmission SCI result is cleared, and only the SCI result for the initial transmission subframe of the current cycle is retained.

[0037] In one preferred embodiment, determining whether the resource occupation position of the current SCI is the same as the resource occupation of the historical SCI includes S13-1 calculating the time domain position of the subframe of the previous period based on the resource reservation period range of the current SCI and the current TDD subframe allocation ratio format; S13-2 positioning the SCI data located at the time domain position of the subframe of the previous period in the sensing window; and S13-3 traversing all historical SCIs of the subframe of the previous period to determine whether the resource occupation position of the historical SCI historical subframe is the same as the resource occupation position of the current SCI.

[0038] In one preferred embodiment, after determining the transmission type of the current SCI, S21 further includes determining whether there is an initial transmission in the previous period's subframe in which the SCI indicates the same frequency domain position if the transmission type of the current SCI is a retransmission, and S22 further includes determining whether there is a retransmission in the previous period's subframe in which the SCI indicates the same frequency domain position if there is an initial transmission in the previous period's subframe in which the SCI indicates the same frequency domain position.

[0039] In one preferred embodiment, excluding candidate resources available in a future resource selection window based on resource reservation information includes S31 discarding a historical SCI stored in the sensing window if the resource reservation information indicates that the resource occupied position of a historical SCI history subframe is the same as the resource occupied position of the current SCI; S32 discarding a previous cycle retransmission SCI stored in the sensing window and not saving the current retransmission SCI if the resource reservation information indicates that a retransmission exists at the same frequency domain position; and S33 saving the data structure of the current retransmission SCI if the resource reservation information indicates that there was no initial transmission in the previous cycle in which the SCI indicated the same frequency domain position.

[0040] In one preferred embodiment, excluding candidates for future resource selection windows based on resource reservation information further includes S41 saving the data structure of the current SCI if the resource reservation information indicates that the scheduling type of the current SCI is event type and the transmission type is initial transmission, and S42 not saving the data structure of the current SCI if the resource reservation information indicates that the scheduling type of the current SCI is event type and the transmission type is retransmission.

[0041] For event-type SCIs, the current transmission type is determined to be either an initial transmission or a retransmission based on the retransmission instruction in the current decoded SCI information for each downlink-enabled subframe.

[0042] If the current transmission type is determined to be an initial transmission, the SCI information being transmitted for the first time is stored. If the current transmission type is determined to be a retransmission, the SCI information being retransmitted is not stored.

[0043] Based on the above prior exclusion of historical resources, the conditions for monitoring SCIs for future resource selection windows and excluding future reserved resources can be broken down into: (1) Based on the Event-type SCI sensing result at the end T' / ms of the sensing window, resource exclusion is performed for the initial transmission of a decoded Event-type SCI, reserving a retransmission resource in accordance with the future resource selection window; and (2) Based on the SPS-type SCI sensing result at T / ms of the sensing window, resource exclusion is performed for the initial and retransmission of a decoded SPS-type SCI, based on its periodic characteristics, regarding the possibility of overlap between reserved resources and candidate available resources in the resource selection window for the corresponding period.

[0044] In LTE-V2X, in scenarios without cellular network coverage, the terminal supports an autonomous selection of transmission resources. When the protocol stack receives a data transmission request from the air interface, it immediately schedules an authorized service transmission request to the physical layer. After the physical layer receives the scheduling request message, it immediately determines the transmission resources based on the current channel busy rate (CBR) and scheduling priority, following the flow described below.

[0045] 1> Submit parameter selections and determine the MCS. 2> Exclude collision subframes that were sent locally and searched for throughout the synchronization period. 3> Subframes sent locally but not monitored in the history detection window are excluded based on the time domain resource pool characteristics. 4> Exclude the occupied subchannel for SCI monitoring in the history detection window. 5> For the largest initial and retransmissions in the future resource selection window, a time-frequency transmission resource will be randomly selected from the remaining available candidate resource set.

[0046] Because side transmissions require high timeliness, terminals need to efficiently position themselves towards the target result and ensure the reliability of the target result during the resource acquisition and allocation process. In LTE-V2X, one side data TB (Transmission Block) is transmitted at most twice, namely the initial transmission and one retransmission. On the other hand, in the three types of side physical channels supported by LTE-V2X, the SCI code stream carried on the PSCCH can dictate the time-frequency resources for these two transmissions. Supporting the autonomous acquisition of transmission resources by terminals is achieved based on the premises of resource reservation, resource sensing, resource exclusion, and resource acquisition.

[0047] Specifically, a terminal transmits SCI reserved time-frequency resources, and other terminals use resource sensing to exclude the resources reserved by that UE and select time-frequency resources that are not excluded, thereby avoiding resource collisions with other terminals during the transmission period.

[0048] If a UE monitors an SCI transmitted by a peer terminal UE within a sensing window, the UE measures the sidelink reference signal receive power (SL-RSRP) of the PSSCH scheduling the SCI. If the measured SL-RSRP is greater than the RSRP threshold, the UE further determines whether the resource indicated by the RIV, SFgap, Retransmission index, and Resource reservation area in the SCI overlaps in the time-frequency range with candidate available resources in the resource selection window. If there is an overlap, the candidate available resource must be removed from the resource candidate set.

[0049] During the sensing process, for each downlink available subframe, the UE monitors the SCI of the current enabled resource pool, decodes the SCI code stream data, and then obtains the transmission information of the peer terminal, which includes, but is not limited to, retransmission instructions, the logical subframe interval between the initial and retransmission, RIV (indicating the starting position of the initial and retransmission subchannels and the continuous subchannel length to be occupied), and resource reservation cycles.

[0050] Based on the resource reservation period range of the decoded SCI, the scheduling type of each decoded SCI on each downlink-available subframe is determined, and the sensing window decoded SCI results are distinguished and stored for each subframe based on the scheduling characteristics of different types of SCIs. Simultaneously, during the sensing process, based on information such as the retransmission instruction of the current decoded SCI, the logical subframe interval between the initial and retransmission, RIV (which indicates the starting position of the initial and retransmission subchannels and the continuous subchannel length occupied), and the resource reservation period, it is determined whether the same SCI transmission result exists in the current or previous period based on the transmission characteristics of different types of SCIs, thereby reducing resource exclusion of redundant SCI results in future resource selection windows.

[0051] According to the above method, for SPS-type SCIs, only the initial SCI information for the most recent cycle is retained in the sensing window, and for Event-type SCIs, only the initial SCI information is retained in the sensing window, along with an indication of the retransmission position. This solves the problem of storing redundant sensing results, reduces the number of resource exclusions for redundant SCI results in the sensing window in the resource selection subframe, and further considers situations in the periodic transmission period of SPS-type SCIs where the current channel condition does not satisfy the channel busy rate, resulting in a loss of initial or retransmission. All valid sensing window SCI results are retained in the sensing window, thereby providing effective and simple sensing window data results for resource duplication determination in the resource selection window.

[0052] In the resource selection subframe, the system moves forward in T / ms and excludes reserved resources from the opposing terminal in the future resource selection window against the decoded SCI data of the history sensing window, thereby maintaining a set of available candidate resources and providing them for random selection of time-frequency resources for the initial and retransmission of local authorized services. During the sensing process of each downlink available subframe, the system pre-classifies and stores the decoded SCI and performs effective rejection, so that when the resource selection subframe arrives, it can quickly position itself to the only valid SCI transmission result of the opposing terminal, and based on this corresponding information, excludes reserved resources in the future resource selection window.

[0053] Specifically, in each downlink-enabled subframe during the sensing process, the pre-exclusion flow of the decoded SCI is not limited to determining the scheduling type of the SCI based on the resource reservation period range of the decoded SCI, and distinguishing the scheduling type as EVENT-type SCI and SPS-type SCI.

[0054] If the current SCI is determined to be an SPS-type SCI, then, as shown in Figure 5, it is determined whether the transmission type of the opposing terminal is an initial transmission or a retransmission, and this is not limited to determining whether the Restransmission Index is not 0 or not. If it is not 0, the transmission type is determined to be an initial transmission, and if it is 0, the transmission type is determined to be a retransmission.

[0055] If it is determined that the current SCI is the first transmission, Step 1.1: Store the SCI data.

[0056] Step 1.2 (Initial Transmission): Based on Rsvp and the current TDD subframe allocation ratio, calculate the initial logical subframe of the previous cycle. Based on the resource reservation period range information in SCI, in the 36.214 protocol, the range of resource reservation period values ​​is {0, 20, 50, 100, 200, 300, ..., 1000}ms, and the unit is absolute subframes. Based on the current TDD subframe allocation ratio format, the time domain position of the logical subframe of the previous cycle is calculated, corresponding to the sidelink transmission step in TabIe 14.1.1-1 of the 36.213 protocol.

[0057] Step 1.3 (Initial Transmission): Position the SCI data for the relevant history subframe location in the sensing window, and traverse all SCI data (SCI Num=c) on the history subframe. Determine whether an initial transmission with the same frequency domain location exists in the previous cycle. The frequency domain location is converted to the initial transmission's starting subchannel location and the size of the consecutive subchannels occupied by the initial transmission, using the indicated RIV value in the SCI information and 14.1.1.4C in the 36.213 protocol, to determine if they are the same. If an initial transmission with the same frequency domain location exists, discard the initial transmission SCI information for the previous cycle of the opposing terminal in the sensing window.

[0058] Step 1.4 (Initial Transmission): Is the SubCHStartld and LsubCH initially transmitted by the current SCI equal to the SubCHStartld and LsubCH initially transmitted by the historical SCI? If the answer is YES, that is, the SubCHStartld and LsubCH initially transmitted by the current SCI are equal to the SubCHStartld and LsubCH initially transmitted by the historical SCI, submit the historical initial transmission SCI information from the previous period. If the answer is NO, that is, the SubCHStartld and LsubCH initially transmitted by the current SCI are not equal to the SubCHStartld and LsubCH initially transmitted by the historical SCI, repeat Step 1.3 (Initial Transmission).

[0059] If the current SCI is determined to be a retransmission, a rollback is performed based on the resource reservation period range information in the SCI to determine whether an initial transmission exists in the previous period at the initial transmission frequency range position indicated in the SCI, and whether a retransmission exists in the previous period at the same frequency range position. Specifically, Step 2.1 (Initial Transmission): Based on the SFgap and the current TDD subframe allocation ratio, the initial transmission logic subframe for the current period is calculated.

[0060] Step 2.2 (Initial transmission): Position the SCI data for the relevant history subframe location within the sensing window.

[0061] The next step is the same as the initial transmission, and Step 1.4 (Initial Transmission) is executed. If it is determined that SubCHStartld and LsubCH transmitted by the current SCI are equal to SubCHStartld and LsubCH transmitted by the history SCI, respectively, then the currently retransmitted SCI data is saved.

[0062] If the result is YES, Step 1.2 (Initial Transmission) and Step 1.3 (Initial Transmission) are executed in order, and then Step 1.4 (Initial Transmission) is executed again. Is the SubCHStartld and LsubCH initially transmitted by the current SCI equal to the SubCHStartld and LsubCH initially transmitted by the history SCI? If the result is NO, Step 1.3 (Initial Transmission) is executed again.

[0063] If the result is determined to be YES, the initial SCI information from the previous cycle is discarded, and the currently retransmitted SCI data is not saved.

[0064] If the current SCI is determined to be an SPS-type SCI, the transmission type of the opposing terminal is determined as shown in Figure 6, and the transmission type of the opposing terminal has two types: initial transmission or retransmission. Specifically, it is not limited to determining whether the Restransmission Index is not 0 or not. If it is not 0, the transmission type is determined to be an initial transmission, and if it is 0, the transmission type is determined to be a retransmission. If it is determined to be an initial transmission, the SCI data is stored, and it is not limited to storing the data structure corresponding to the SCI. If it is determined to be a retransmission, it is determined to be a historical transmission for the resource selection window, and the data structure corresponding to the SCI is not stored.

[0065] The beneficial effects of this invention are reflected in two main aspects. In the first aspect, for the history-sensing window data structure, it is not necessary to store each downlink available subframe, and two types of data storage are distinguished based on the SCI scheduling type, significantly reducing the memory occupied space.

[0066] On the other hand, for each downlink-enabled subframe, only the SCI information initially transmitted in the latest cycle of the opposing terminal is retained, along with indicating the retransmission location. This solves the problem of storing redundant sensing results, reduces the number of resource exclusions for sensing window redundant SCI results in the resource selection subframe, and further considers situations where, in the periodic transmission period of an SPS-type SCI, an inequality occurs where the current channel condition does not satisfy the channel busy rate, resulting in a loss of either an initial transmission or a retransmission. All valid sensing window SCI results are retained in the sensing window, thereby providing effective and simple sensing window data results for resource duplication determination in the resource selection window.

[0067] In the second aspect, for future resource selection windows, periodic overlaps of periodic transmission SCIs are already excluded during the sensing process. Therefore, when a resource selection subframe arrives, it can be quickly positioned at the only valid SCI transmission result of the opposing terminal, and based on this corresponding information, resource exclusion is performed for reserved resources in future resource selection windows. This efficiently saves search time, enables the fastest possible SCI monitoring exclusion for sensing windows, provides a set of effective candidate resources available for local side up transmissions, and reduces the time-series pressure of resource selection.

[0068] Based on the above description of the embodiments, those skilled in the art will clearly understand that the method according to the above embodiments can be implemented in the form of software and an essential general-purpose hardware platform, and of course, can be implemented in hardware, but in many cases the former is a more preferred embodiment.

[0069] With this understanding in mind, the proposed technologies of this disclosure may be reflected in the form of a software product, which is essentially or contributes to the prior art, and which is stored on a single storage medium (e.g., read-only memory / random access memory (ROM / RAM), magnetic disk, optical disk) and includes a number of instructions for causing a single terminal device (which may be a mobile phone, computer, server, or network device, etc.) to perform the methods described in each embodiment of this disclosure.

[0070] In this embodiment, a resource exclusion device for monitoring side link control information SCI is further provided, which is used to implement the above embodiment and preferred embodiments, and will not be described further. The term "module" as used below may refer to a combination of software and / or hardware that implements a pre-configured function. The devices described in the following embodiments are preferably implemented by software, but may also be conceived to be implemented by hardware, or a combination of software and hardware.

[0071] Figure 7 is a structural block diagram of a resource exclusion device for monitoring sidelink control information SCI according to an embodiment of the present disclosure. As shown in Figure 7, the device includes a decoding module 72 configured to decode the current sidelink control information SCI for each downlink available subframe, where the first LTE-V2X terminal monitors the SCI transmitted by the second LTE-V2X terminal within a sensing window, and an acquisition module 74 configured to acquire resource reservation information of the second LTE-V2X terminal based on the scheduling type and transmission type of the current SCI, and an exclusion module 76 configured to exclude candidate resources available in a future resource selection window based on the resource reservation information.

[0072] In one embodiment, a resource exclusion device that monitors the side-link control information SCI determines the scheduling type of the current SCI of a second LTE-V2X terminal based on the resource reservation period range obtained by the first LTE-V2X terminal decoding the side-2 link control information SCI after the first LTE-V2X terminal decodes the current SCI, further comprising a first determination module configured such that the scheduling type includes periodic and event-based types.

[0073] In one embodiment, the acquisition module 74 further includes determining the transmission type of the current SCI if the scheduling type of the current SCI is periodic, storing the data structure of the current SCI if the transmission type of the current SCI is initial transmission, determining whether the resource occupancy position of the current SCI is the same as the resource occupancy of the historical SCI, and obtaining resource reservation information.

[0074] In one embodiment, determining whether the resource occupation position of the current SCI and the resource occupation of the historical SCI are the same in the acquisition module 74 includes: calculating the time domain position of the subframe of the previous period based on the resource reservation period range of the current SCI and the current TDD subframe allocation ratio format; positioning the SCI data located at the time domain position of the subframe of the previous period in the sensing window; and traversing all historical SCIs of the subframe of the previous period to determine whether the resource occupation position of the historical SCI historical subframe is the same as the resource occupation position of the current SCI.

[0075] In one embodiment, a resource exclusion device that monitors the sidelink control information SCI further includes a first determination module configured to determine the transmission type of the current SCI, and if the transmission type of the current SCI is a retransmission, to determine whether there is an initial transmission in the previous period's subframe in which the SCI points to the same frequency domain position, and if there is an initial transmission in the previous period's subframe in which the SCI points to the same frequency domain position, to determine whether there is a retransmission in the previous period's subframe in which the SCI points to the same frequency domain position.

[0076] In one embodiment, the exclusion module 76 further includes discarding a historical SCI stored in the sensing window if resource reservation information indicates that the resource occupied position of a historical SCI historical subframe is the same as the resource occupied position of the current SCI; discarding a previous cycle retransmission SCI stored in the sensing window if resource reservation information indicates that a retransmission exists at the same frequency domain position; and not saving the current retransmission SCI; and saving the data structure of the current retransmission SCI if resource reservation information indicates that there was no initial transmission in the previous cycle in which the SCI indicated the same frequency domain position.

[0077] In one embodiment, the exclusion module 76 further includes saving the data structure of the current SCI if the resource reservation information indicates that the scheduling type of the current SCI is event-type and the transmission type is initial transmission, and not saving the data structure of the current SCI if the resource reservation information indicates that the scheduling type of the current SCI is event-type and the transmission type is retransmission.

[0078] Each of the above modules may be implemented by software or hardware. If implemented by hardware, each module may be located on the same processor, or each module may be located on different processors in any combination, but is not limited to these arrangements.

[0079] To facilitate understanding of the technical proposal presented in this disclosure, the following will be explained in detail based on specific examples.

[0080] Embodiments of the present disclosure further provide a computer-readable storage medium in which a computer program is stored that is configured to perform the steps of any one of the method embodiments described above when executed.

[0081] In one exemplary embodiment, the computer-readable storage medium may include, but is not limited to, various media capable of storing computer programs, such as USB disks, read-only memory (ROM), random access memory (RAM), removable hard disks, magnetic disks, or optical disks.

[0082] Embodiments of the present disclosure further provide an electronic device comprising a memory in which a computer program is stored, and a processor configured to execute the computer program and perform the steps in any one of the method embodiments described above.

[0083] In one exemplary embodiment, the electronic device may further include a transmission device connected to the processor and an input / output device connected to the processor.

[0084] Specific examples in this embodiment can be found by referring to the examples described in the above embodiment and exemplary embodiment, and this embodiment will not be described further here.

[0085] Clearly, as those skilled in the art will see, each module or step in the embodiments of the present disclosure may be implemented by a general-purpose arithmetic unit, centralized in a single arithmetic unit, or distributed across a network of multiple arithmetic units; they may be implemented by program code executable by the arithmetic unit, which may be stored in memory and executed by the arithmetic unit; in some cases, steps shown or described in a different order than herein may be performed; they may be created as separate integrated circuit modules; or several of these modules or steps may be created as a single integrated circuit module for implementation. Thus, the present disclosure is not limited to any particular combination of hardware and software.

[0086] The foregoing are merely preferred embodiments of the Disclosure and are not intended to limit the Disclosure. To those skilled in the art, the Disclosure may be modified or altered in various ways. Any modifications, equivalent substitutions, and improvements made insofar as they do not deviate from the spirit of the Disclosure shall be within the scope of the Disclosure.

Claims

1. A method for excluding resources that monitor side link control information (SCI), The first LTE-V2X terminal monitors the SCI transmitted by the second LTE-V2X terminal within the sensing window, and for each downlink-available subframe, the first LTE-V2X terminal decodes the current sidelink control information SCI. Based on the current SCI scheduling type and transmission type, resource reservation information for the second LTE-V2X terminal is obtained, This includes excluding resources that may be available as candidates in the resource selection window in the future, based on the aforementioned resource reservation information. After the first LTE-V2X terminal decodes the sidelink control information SCI, The first LTE-V2X terminal determines the scheduling type of the current SCI of the second LTE-V2X terminal based on the resource reservation period range obtained by decoding the current SCI, wherein the scheduling type further includes periodic and event-based types. method.

2. Based on the current SCI scheduling type and transmission type, obtaining resource reservation information for the second LTE-V2X terminal is: If the current SCI scheduling type is the periodic type, then determine the transmission type of the current SCI. If the current SCI transmission type is the initial transmission, the data structure of the current SCI is saved, The method according to claim 1, further comprising determining whether the resource occupancy location of the current SCI and the resource occupancy location of the historical SCI are the same, and obtaining the resource reservation information.

3. Determining whether the resource occupancy location of the current SCI and the resource occupancy location of the historical SCI are the same is: Based on the current SCI resource reservation period range and the sidelink transmission step corresponding to the current TDD subframe allocation ratio format, the time domain position of the subframe of the previous period is calculated. Positioning the SCI data located in the time domain position of the subframe of the previous cycle within the sensing window, This includes traversing all historical SCIs of the previous period's subframe to determine whether the resource occupancy location of the historical SCI is the same as the resource occupancy location of the current SCI. The method according to claim 2.

4. After determining the current SCI transmission type, If the current SCI transmission type is retransmission, determine whether or not there is an initial transmission in the previous period's subframe in which the SCI indicates the same frequency domain position, If an initial transmission indicating the same frequency domain position exists in the subframe of the previous period, the method further includes determining whether or not a retransmission of the same frequency domain position exists in the subframe of the previous period. The method according to claim 3.

5. Based on the aforementioned resource reservation information, it is possible to exclude potential available resources from the resource selection window in the future. If the resource reservation information indicates that the resource occupancy location of the historical SCI is the same as the resource occupancy location of the current SCI, the historical SCI stored in the sensing window is discarded. If the resource reservation information indicates that a retransmission exists at the same frequency domain position, the retransmission SCI of the previous period stored in the sensing window is discarded, and the current retransmission SCI is not stored. If the resource reservation information indicates that there was no initial transmission in the previous cycle that indicated the same frequency domain position for the SCI, then the data structure of the current retransmitted SCI is saved, including: The method according to claim 2.

6. Based on the aforementioned resource reservation information, it is possible to exclude potential available resources from the resource selection window in the future. If the resource reservation information indicates that the current SCI scheduling type is the event type and the transmission type is the initial transmission, then the data structure of the current SCI is saved. If the resource reservation information indicates that the current SCI scheduling type is the event type and the transmission type is retransmission, then the data structure of the current SCI is not saved, further comprising: The method according to claim 1.

7. The first LTE-V2X terminal monitors the SCI transmitted by the second LTE-V2X terminal within the sensing window, and for each downlink-available subframe, the first LTE-V2X terminal is configured to decode the current sidelink control information SCI, and An acquisition module is installed to acquire resource reservation information for the second LTE-V2X terminal based on the current SCI scheduling type and transmission type, An exclusion module is installed to exclude potential resources that may be available in the resource selection window in the future, based on the aforementioned resource reservation information. After the first LTE-V2X terminal decodes the side-2 link control information SCI, the first LTE-V2X terminal determines the scheduling type of the current SCI of the second LTE-V2X terminal based on the resource reservation period range obtained by decoding the current SCI, where the scheduling type includes a first determination module configured to include periodic and event-based types. A resource exclusion device that monitors side link control information (SCI).

8. A computer-readable storage medium that stores a computer program that, when executed by a processor, performs the steps of the method according to any one of claims 1 to 6.

9. The system includes memory, a processor, and a computer program stored in the memory and executable by the processor, wherein the processor, when executing the computer program, implements the steps of the method according to any one of claims 1 to 6. electronic equipment.

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