Resource Exclusion Method and Apparatus for Monitoring SideLink 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 more specifically, to a resource exclusion method and apparatus for monitoring sidelink control information (SCI).

Background Art

[0002] C-V2X is an abbreviation for 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 the sidelink 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 resources by exchanging space for time, and the other is to improve the efficiency of autonomously selecting resources by exchanging time for space. However, neither of these two methods can reduce the complexity of an LTE-V2X terminal transmitting sidelink awareness window SCI monitoring resource selection, so the degree of improvement in resource selection efficiency is limited.

Summary of the Invention

Problems to be Solved by the Invention

[0005] Embodiments of the present disclosure provide a resource exclusion method and apparatus for monitoring sidelink control information (SCI), which at least solve the problem that in related technologies, the efficiency improvement of resource selection is limited due to the high complexity of an LTE-V2X terminal transmitting sidelink sensing window SCI monitoring resource selection. **Means for Solving the Problem**

[0006] According to an embodiment of the present disclosure, a resource exclusion method for monitoring sidelink control information (SCI) is provided. A first LTE-V2X terminal monitors SCI transmitted by a second LTE-V2X terminal within a sensing window. For each downlink available 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 excludes candidate available resources in a future resource selection window based on the resource reservation information.

[0007] According to another embodiment of the present disclosure, a resource exclusion apparatus for monitoring sidelink control information (SCI) is provided. A first LTE-V2X terminal monitors SCI transmitted by a second LTE-V2X terminal within a sensing window. For each downlink available subframe, the first LTE-V2X terminal includes a decoding module configured to decode current sidelink control information (SCI), an acquisition module configured to obtain 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 candidate available resources in a future resource selection window based on the resource reservation information.

[0008] According to another embodiment of the present disclosure, there is further provided a computer-readable storage medium storing a computer program which, when executed, is configured to execute the steps in the method embodiment of any one of the above items.

[0009] According to another embodiment of the present disclosure, there is further provided an electronic device including a memory storing a computer program and a processor configured to execute the computer program to execute the steps in the method embodiment of any one of the above items.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3-1

Figure 3-2

Figure 4

Figure 5

Figure 6

Figure 7

Best Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings and based on examples.

[0012] Note that terms such as "first" and "second" in the specification, claims, and drawings of the present disclosure are used to distinguish similar objects and do not necessarily need to be used to describe a specific order or sequence.

[0013] Terms related to the embodiments of the present application will be described. UE: User Equipment, user device. CBR: Chanel Busy Rate, channel busy rate. MCS: Modulation and Coding Scheme, modulation and coding scheme. RSRP: Reference Signal Received Power, reference signal received power. SL-RSRP: Sidelink-REference Signal Received Power, sidelink reference signal received power. SCI: SideLink Control Information, sidelink control information. RIV: Resource Indication Value, resource indication value. SPS: Semi-Persistent Scheduling, semi-persistent scheduling.

[0014] PSSCH: Physical Sidelink Shared Channel, physical sidelink shared channel. PSCCH: Physical Sidelink Control Channel, 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 a processing device such as a microcontroller unit (MCU) or a field programmable gate array (FPGA), but is not limited thereto), 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 a module 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 execute various functional applications and data processing, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may further include a non-volatile memory, for example, one or more magnetic storage devices, a flash memory, or other non-volatile solid memories.

[0019] In some embodiments, the memory 104 may further include a memory that is installed remotely with respect to 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, an intranet, a local network, a mobile communication network, and combinations thereof.

[0020] The transmission device 106 is used to receive or transmit data via a 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 the sidelink 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: the first LTE-V2X terminal monitors the SCI transmitted by the second LTE-V2X terminal within a sensing window; for each available downlink subframe, the first LTE-V2X terminal decodes the current sidelink control information SCI in step S202; based on the scheduling type and transmission type of the current SCI, obtains the resource reservation information of the second LTE-V2X terminal in step S204; and based on the resource reservation information, performs resource exclusion for candidate available resources in a future resource selection window 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 for data transmission. Based on the SCI scheduling type and transmission type, the local terminal determines the resource reservation information used to transmit data to the peer terminal, thereby excluding available resources in the future resource selection window.

[0023] The candidate available resources in the future resource selection window are not limited to the resources occupied at future times reserved by the current resource selection window monitored and determined based on the current resource selection window when the first LTE-V2X terminal and the second LTE-V2X terminal communicate. By excluding the already occupied resources, for the future resource selection window, the resources that are not reserved and can be occupied are determined. By excluding the candidate available resources in the future resource selection window, the complexity for the terminal to select resources can be reduced, the time-series pressure on the resource selection subframe of the terminal can be alleviated, and the impact on the resource selection process can be reduced.

[0024] In the embodiments of the present application, based on the current SCI scheduling type and transmission type, in order to obtain the resource reservation information of the terminal, the candidate available resources in the future resource selection window can be excluded based on the resource reservation information, realizing the exclusion of SCI monitoring in the sensing window, and providing a set of candidate available resources effective for local uplink transmission. The problems of exclusion redundancy and exclusion omission are effectively solved, and the problem that in the related art, the improvement of the resource selection efficiency is limited due to the high complexity of the LTE-V2X terminal transmitting the sensing window SCI monitoring resource selection on the side is solved, and the technical effect of improving the resource selection efficiency is realized.

[0025] As a 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 domain obtained by decoding the current SCI. Here, the scheduling type further includes a periodic type and an event type.

[0026] When considering the overhead in space and time simultaneously, based on the transmission characteristics of V2X, conditional judgment and rejection are performed on the redundant SCI data results in the sensing process. Based on the resource reservation information characteristics of SCI, the SCI monitored in the sensing window according to the resource reservation period is distinguished into two scheduling types. One is the periodic SCI, that is, the SPS (semi-persistent scheduling type periodicity) type SCI, which needs to reserve time-frequency resources periodically, and the other is the event type SCI, that is, the EVENT (event type scheduling type eventfulness) type SCI, which reserves time-frequency resources for at most two transmissions, namely the first transmission and the retransmission. The transmission type is not limited to including the first transmission and the retransmission. The first transmission indicates that this is the first transmission, and the retransmission indicates that this is the second transmission.

[0027] In the process of transmitting the event type SCI, the transmission interval between the first transmission and the retransmission is 15 logical subframes or less, and based on the characteristics of the available subframes in the resource pool, 64 or less absolute subframes (unit: ms) can be calculated. Then, in the T / ms sensing window, it means that there is a high possibility of reserving that the opposite terminal of the future resource selection window of the local terminal appears in the time zone of the end T’ / ms (T’<=64ms) of the sensing window. The opposite terminal in the remaining time zone has already been a historical transmission and is simply used as a reference index for the channel busy rate of the local terminal.

[0028] Therefore, it is possible to store two types of SCI decoding information data respectively. One is stored as the T / ms sensing window of the SPS type SCI, and the other is stored as the T’ / ms sensing window of the EVENT type SCI. Looking from the vertical dimension of space, the storage space is extremely saved, and looking from the horizontal dimension of time, the traversal search process for two types of SCI reserved resources is extremely saved. Based on the above classification, for each monitoring subframe, after monitoring the SCI, perform prior history resource exclusion.

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

[0030] Specifically explain Scenario 1. As shown in Figure 3-1, the latest one cycle m+4 of the opposite terminal UE has already completed transmitting both the initial transmission and the retransmission. In the sensing process, the local UE monitors the initial transmission and the retransmission at the corresponding time-frequency position. In this scenario, it is not limited to rolling back to the time-frequency position of the initial transmission for judgment. Only the SCI result of the initial transmission position of the latest cycle is saved as the exclusion basis for the future resource reservation of the opposite terminal UE, and it is not necessary to repeatedly reject the transmission SCI results of the remaining cycles and the SCI results of the historical retransmissions.

[0031] As shown in Figure 3-2, the latest one cycle m+4 of the opposite terminal UE has completed transmitting only the initial transmission, and the retransmission exists in the future resource selection window. In this case, the initial transmission SCI result of the latest cycle is used as the resource exclusion basis for the future resource reservation of the opposite terminal UE. The essential difference from the periodic transmission of the opposite 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 to prevent resource selection failure or transmission failure due to exclusion omission.

[0032] Specifically describe Scene 2. As shown in FIG. 4, there is no complete periodic transmission result within the sensing window, and for complex channel conditions, it is impossible to exclude the possibility of the first transmission failure by the opposite terminal UE. In this scene, in order to prevent the resource exclusion result from becoming uncertain due to over-excluding the sensing window SCI, each time an SCI is received and a retransmission is instructed, based on the logical subframe offset of the first transmission and the retransmission, roll back to the corresponding time-frequency position to search for whether the same SCI first transmission result exists. If it does not exist, it is necessary to retain the current retransmission SCI result, thereby ensuring the validity of the SCI result in the sensing window.

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

[0034] Based on the retransmission instruction in the current decoded SCI information, determine whether the current transmission type is the first transmission or the retransmission, and the time-frequency position.

[0035] If it is determined that the current transmission type is the first transmission, convert it to the logical subframe offset based on the current resource reservation period according to the first transmission start subchannel index and the occupied continuous subchannel length in the SCI information, offset it forward, and query whether the same PSSCH and PSCCH (or PSSCH) exist at the corresponding subchannel position in the previous period. If it exists, it means that the first transmission result of the current period clears the SCI result of the subframe offset forward, and retain the SCI result of the first transmission subframe of the current period.

[0036] If it is determined that the current transmission type is a retransmission, perform the same query determination as the initial transmission. Based on the logical subframe offsets of the initial transmission and the retransmission, query whether the initial transmission from the peer terminal at the position corresponding to the initial transmission position of the current period has been received after offsetting previously. If the initial transmission from the peer terminal at the position has been received, clear the current retransmission SCI result and retain only the SCI result of the initial transmission subframe of the current period.

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

[0038] In one preferred embodiment, after determining the transmission type of the current SCI, if the transmission type of the current SCI is a retransmission, it further includes: S21 for determining whether there is an initial transmission in the subframe of the previous period that indicates the same frequency domain position by the SCI; and S22 for determining whether there is a retransmission at the same frequency domain position in the subframe of the previous period if there is an initial transmission in the subframe of the previous period that indicates the same frequency domain position by the SCI.

[0039] As a preferred embodiment, based on the resource reservation information, excluding available resources for the future resource selection window candidates includes: S31 of rejecting the historical SCI stored in the sensing window when the resource reservation information indicates that the resource occupancy position of the historical SCI subframe in the history is the same as that of the current SCI; S32 of rejecting the retransmission SCI of the previous period stored in the sensing window and not storing the current retransmission SCI when the resource reservation information indicates that there is a retransmission at the same frequency region position; and S33 of storing the data structure of the current retransmission SCI when the resource reservation information indicates that there is no initial transmission indicating the same frequency region position of the SCI in the previous period.

[0040] As a preferred embodiment, based on the resource reservation information, excluding available resources for the future resource selection window candidates further includes: S41 of storing the data structure of the current SCI when 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 of not storing the data structure of the current SCI when the resource reservation information indicates that the scheduling type of the current SCI is event type and the transmission type is retransmission.

[0041] For the Event type SCI, based on the retransmission indication in the current decoded SCI information in each available downlink subframe, determine whether the current transmission type is initial transmission or retransmission.

[0042] If it is determined that the current transmission type is initial transmission, store the currently initially transmitted SCI information; if it is determined that the current transmission type is retransmission, do not store the currently retransmitted SCI information.

[0043] Based on the above-mentioned prior history resource exclusion, the conditions for monitoring SCI for the future resource selection window and performing future reservation resource exclusion are as follows: (1) Based on the Event-type SCI sensing result of the terminal T’ / ms in the sensing window, for the first transmission of the decoded Event-type SCI, perform resource exclusion for reserving the retransmission resource corresponding to the future resource selection window; (2) Based on the SPS-type SCI sensing result of T / ms in the sensing window, for the first transmission and retransmission of the decoded SPS-type SCI, based on its periodic characteristics, perform resource exclusion regarding the possibility of overlap between the reserved resources and the candidate available resources in the resource selection window of its corresponding period, and can be decomposed as such.

[0044] In LTE-V2X, in a scenario without cellular network coverage, the terminal supports a method of autonomously selecting transmission resources. When the protocol stack receives a data transmission request from the air interface, it immediately schedules the authorization service transmission request to the physical layer. After the physical layer receives the scheduling request message, it immediately performs the following flow to determine the transmission resources based on the current channel busy rate (CBR) and scheduling priority.

[0045] 1. Transmit parameter selection and determine the MCS. 2. Exclude the collision subframes that have been searched locally for the entire synchronization period transmitted locally. 3. Exclude the subframes transmitted locally but not monitored in the history sensing window based on the time-domain resource pool characteristics. 4. Exclude the occupied subchannels of SCI monitoring in the history sensing window. 5. Randomly select time-frequency transmission resources from the remaining available candidate resource sets for the maximum first transmission and retransmission in the future resource selection window.

[0046] Since high timeliness is required for sidelink transmission, the terminal needs to be more efficiently positioned towards the target result and ensure the reliability of the target result during the process of resource collection and allocation. In LTE-V2X, one sidelink data TB (Transmission Block) is transmitted at most twice, that is, the initial transmission and one retransmission. On the other hand, among the three types of sidelink physical channels supported by LTE-V2X, the SCI code stream carried on the PSCCH can indicate the time-frequency resources for these two transmissions. Supporting the terminal to autonomously collect transmission resources is realized based on the preconditions of resource reservation, resource sensing, resource exclusion, and resource collection.

[0047] Specifically, the terminal transmits SCI reservation time-frequency resources, and other terminals use resource sensing to exclude the resources reserved by the UE, and select the time-frequency resources that have not been excluded, so as to avoid resource collisions with other terminals during the transmission period.

[0048] When the UE monitors the SCI transmitted by the opposite terminal UE within the sensing window, the UE measures the sidelink reference signal reception power (SL-RSRP) of the PSSCH that schedules the SCI. If the measured SL-RSRP is greater than the RSRP threshold, the UE further determines whether the resources indicated by the RIV, SFgap, Retransmission index, and Resource reservation fields in the SCI overlap with the candidate available resources in the resource selection window in the time-frequency domain. If there is an overlap, it is necessary to exclude the candidate available resources from the resource candidate set.

[0049] In each downlink available subframe in the sensing process, the UE monitors the SCI of the current enabled resource pool. After decoding the SCI code stream data, the UE obtains the transmission information of the peer terminal. The transmission information of the peer terminal includes, but is not limited to, a retransmission indication, the logical subframe interval between the first transmission and retransmission, the RIV (indicating the start position of the subchannels for the first transmission and retransmission and the length of the continuous subchannels occupied), and the resource reservation period.

[0050] Based on the resource reservation period field of the decoded SCI, determine the scheduling type of each decoded SCI on each downlink available subframe, and distinguish and store the sensing window decoded SCI results for each subframe according to the scheduling characteristics of different types of SCI. At the same time, in the sensing process, based on information such as the retransmission indication, the logical subframe interval between the first transmission and retransmission, the RIV (indicating the start position of the subchannels for the first transmission and retransmission and the length of the continuous subchannels occupied), and the resource reservation period of the current decoded SCI, determine whether the same SCI transmission result exists in the current period or the previous period according to the transmission characteristics of different types of SCI, thereby reducing the resource exclusion for redundant SCI results in the future resource selection window.

[0051] According to the above method, for the SPS type SCI, only the SCI information transmitted for the first time in the latest period in the sensing window is retained. For the Event type SCI, only the SCI information transmitted for the first time in the sensing window is retained and the retransmission position is indicated. 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 the situation where a loss in the first transmission or retransmission occurs in an inequality where the current channel condition does not meet the channel busy rate during the periodic transmission period of the SPS type SCI. All valid sensing window SCI results are retained in the sensing window, thereby providing an effective and simple sensing window data result for the resource duplication judgment in the resource selection window.

[0052] In the resource selection subframe, move forward by T / ms and exclude the reserved resources of the opposite terminal in the future resource selection window for the decoded SCI data in the history awareness window, thereby retaining the available candidate resource set and providing it for the random selection of the time-frequency resources for the first transmission and retransmission of the local authorization service. In the sensing process of each downlink available subframe, perform the pre-classification storage and effective rejection of the decoded SCI in advance, so that when the resource selection subframe arrives, it can quickly locate the only effective SCI transmission result of the opposite terminal, and based on the corresponding information, perform resource exclusion on the reserved resources in the future resource selection window.

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

[0054] If it is determined that the current SCI is an SPS-type SCI, as shown in FIG. 5, it is not limited to only determining whether the transmission type of the opposite terminal is the first transmission or the retransmission. Specifically, it is not limited to only determining whether the Restransmission Index is not 0. If it is not 0, it is determined that the transmission type is the first transmission, and if it is 0, it is determined that the transmission type is the 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): Calculate the initial transmission logical subframe of the previous period based on the Rsvp and the current TDD subframe allocation ratio. Based on the resource reservation period domain information in the SCI, in the 36.214 protocol, the value range of the resource reservation period is {0, 20, 50, 100, 200, 300,..., 1000} ms, and the unit is the absolute subframe. Calculate the logical subframe time domain position of the previous period corresponding to the sidelink transmission step in Table 14.1.1-1 in the 36.213 protocol based on the current TDD subframe allocation ratio form.

[0057] Step 1.3 (Initial Transmission): Locate the SCI data at the position of the historical subframe in the sensing window and traverse all the SCI data (SCI Num = c) on the historical subframe. Determine whether there is an initial transmission at the same frequency domain position in the previous period. The frequency domain position is determined whether it is the same by converting it according to the indicated RIV value in the SCI information and the start subchannel position and the size of the continuous subchannels occupied by the initial transmission according to 14.1.1.4C in the 36.213 protocol. If there is an initial transmission at the same frequency domain position, reject the initial transmission SCI information of the opposite terminal in the previous period 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 respectively? If it is determined to be YES, that is, if the SubCHStartld and LsubCH initially transmitted by the current SCI are equal to the SubCHStartld and LsubCH initially transmitted by the historical SCI respectively, submit the historical initial transmission SCI information of the previous period. If it is determined to be NO, that is, if the SubCHStartld and LsubCH initially transmitted by the current SCI are not equal to the SubCHStartld and LsubCH initially transmitted by the historical SCI, execute Step 1.3 (Initial Transmission) again.

[0059] When it is determined that the current SCI is a retransmission, a rollback is performed based on the resource reservation cycle domain information in the SCI to make a two-layer determination. It is determined whether there is a first transmission at the first transmission frequency domain position indicated in the SCI in the previous cycle, and it is determined whether there is a retransmission at the same frequency domain position in the previous cycle. Specifically, Step2.1 (first transmission): Calculate the first transmission logical subframe of the current cycle based on SFgap and the current TDD subframe allocation ratio.

[0060] Step2.2 (first transmission): Locate the SCI data at the position of the historical subframe in the sensing window.

[0061] Next is the same as the first transmission, and Step1.4 (first transmission) is executed. Is the SubCHStartld and LsubCH initially transmitted by the current SCI equal to the SubCHStartld and LsubCH initially transmitted by the historical SCI respectively? If it is determined to be NO, save the currently retransmitted SCI data.

[0062] If it is determined to be YES, after sequentially executing Step1.2 (first transmission) and Step1.3 (first transmission), execute Step1.4 (first transmission) again. Is the SubCHStartld and LsubCH initially transmitted by the current SCI equal to the SubCHStartld and LsubCH initially transmitted by the historical SCI respectively? If it is determined to be NO, execute Step1.3 (first transmission) again.

[0063] If it is determined to be YES, reject the first transmission SCI information of the previous cycle and do not save the currently retransmitted SCI data.

[0064] When it is determined that the current SCI is of the SPS type SCI, as shown in FIG. 6, the transmission type of the opposite terminal is determined. The transmission type of the opposite terminal has two types: initial transmission or retransmission. Specifically, it is not limited to only determining whether the Retransmission Index is not 0. If it is not 0, it is determined that the transmission type is an initial transmission. If it is 0, it is determined that the transmission type is a retransmission. When it is determined that it is an initial transmission, it is not limited to only storing the SCI data and storing the data structure corresponding to the SCI. When it is determined that it is a retransmission, it is determined that it is a historical transmission for the resource selection window, and the data structure corresponding to the SCI is not saved.

[0065] The beneficial effects of this application are mainly reflected in two aspects. In the first aspect, for the historical sensing window data structure, it is necessary to store each downlink available subframe, distinguish two types of data storage based on the scheduling type of the SCI, and greatly save the memory occupancy space.

[0066] On the other hand, for each downlink available subframe, it only holds the SCI information initially transmitted in the latest period of the opposite terminal, indicates the retransmission position, solves the problem of storing the redundant sensing result, reduces the number of resource exclusions for the sensing window redundant SCI result in the resource selection subframe, and further considers the situation where in the periodic transmission period of the SPS type SCI, when the current channel condition does not satisfy the inequality of the channel busy rate, there will be a loss of a certain initial transmission or a certain retransmission. All valid sensing window SCI results are retained in the sensing window, thereby providing an effective and simple sensing window data result for the resource duplication judgment of the resource selection window.

[0067] On the second side, for the future resource selection window, since the periodic repetition of the periodic transmission SCI has already been excluded in the sensing process, when the resource selection subframe arrives, it can quickly position to the only valid SCI transmission result of the opposite terminal, and based on the corresponding information, perform resource exclusion on the reserved resources in the future resource selection window. It efficiently saves the search time, most quickly realizes the exclusion of SCI monitoring in the sensing window, provides a set of candidate available resources that are effective for the local uplink transmission, and reduces the time-series pressure of resource selection.

[0068] According to the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software and an essential general-purpose hardware platform, and of course, it can also be implemented by hardware. In many cases, the former is a more preferred embodiment.

[0069] Based on such an understanding, the technical solution of the present disclosure, in essence or the part that contributes to the prior art, can be reflected in the form of a software product. The computer software product is stored in a storage medium (for example, Read-Only Memory / Random Access Memory (ROM / RAM), magnetic disk, optical disk), and includes a plurality of instructions for causing a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the embodiments of the present disclosure.

[0070] In this embodiment, a resource exclusion device for monitoring side link control information (SCI) is further provided. The device is used to implement the above embodiment and preferred embodiments, and will not be further described for those already explained. The term "module" used hereinafter may be a combination of software and / or hardware that realizes a preset function. The devices described in the following embodiments are preferably realized by software, but may also be conceived to be realized by hardware, or a combination of software and hardware.

[0071] FIG. 7 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. As shown in FIG. 7, the device includes: a decoding module 72 installed so that a first LTE-V2X terminal monitors SCI transmitted by a 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); an acquisition module 74 installed 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 installed to perform exclusion of candidate available resources in a future resource selection window based on the resource reservation information.

[0072] In one embodiment, the resource exclusion device for monitoring the side link control information (SCI) further includes a first determination module installed so that 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 domain obtained by decoding the current SCI, where the scheduling type includes a periodic type and an event type.

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

[0074] In one embodiment, determining whether the resource occupancy position of the current SCI is the same as that of the historical SCI in the obtaining module 74 includes calculating the time-domain position of the subframe of the previous period based on the resource reservation cycle domain 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 the historical SCIs of the subframe of the previous period to determine whether the resource occupancy position of the historical SCI history subframe is the same as that of the current SCI.

[0075] In one embodiment, the resource exclusion device for monitoring the sidelink control information SCI further includes a first determination module configured to determine whether there is an initial transmission in the previous subframe where the SCI indicates the same frequency-domain position after determining the transmission type of the current SCI. When there is an initial transmission in the previous subframe where the SCI indicates the same frequency-domain position, the first determination module is further configured to determine whether there is a retransmission at the same frequency-domain position in the previous subframe.

[0076] In one embodiment, when the resource reservation information indicates that the resource occupancy position of the historical SCI history subframe is the same as that of the current SCI, the exclusion module 76 rejects the historical SCI stored in the sensing window, and when the resource reservation information indicates that there is a retransmission at the same frequency domain position, the exclusion module 76 rejects the retransmission SCI of the previous period stored in the sensing window, and does not save the current retransmission SCI. When the resource reservation information indicates that there is no first transmission indicating the same frequency domain position by the SCI in the previous period, the exclusion module 76 further includes saving the data structure of the current retransmission SCI.

[0077] In one embodiment, when the resource reservation information indicates that the scheduling type of the current SCI is event type and the transmission type is first transmission, the exclusion module 76 saves the data structure of the current SCI. When the resource reservation information indicates that the scheduling type of the current SCI is event type and the transmission type is retransmission, the exclusion module 76 does not save the data structure of the current SCI.

[0078] It should be noted that each of the above modules may be implemented by software or hardware. When implemented by hardware, each of the above modules may be located in the same processor, or may be implemented in such a way that each of the above modules is located in different processors in any combination form, but is not limited thereto.

[0079] To facilitate the understanding of the technical solution according to the present disclosure, the following will be described in detail based on the embodiments of specific scenarios.

[0080] The embodiments of the present disclosure further provide a computer-readable storage medium storing a computer program configured to execute the steps in the method embodiments of any one of the 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 a storage computer program, such as a USB disk, a read-only memory (abbreviated as ROM), a random access memory (abbreviated as RAM), a removable hard disk, a magnetic disk, or an optical disk.

[0082] Embodiments of the present disclosure further provide an electronic device including a memory in which a computer program is stored, and a processor installed to execute the computer program to execute the steps in the method embodiment of any one of the above items.

[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 may refer to the examples described in the above embodiments and exemplary embodiments, and this embodiment will not be further described here.

[0085] Obviously, as will be understood by those skilled in the art, each module or each step of the above embodiments of the present disclosure may be implemented by a general-purpose computing device, may be concentrated in a single computing device, or may be distributed in a network composed of a plurality of computing devices. They may also be implemented by program codes executable by the computing device, whereby they may be stored in a storage device and executed by the computing device. In some cases, the steps shown or described in a different order here may be executed, or they may be created as each integrated circuit module respectively, or a plurality of them may be created and implemented as a single integrated circuit module. Thus, the present disclosure is not limited to any specific combination of hardware and software.

[0086] The above are merely preferred embodiments of the present disclosure and are not intended to limit the present disclosure. For those skilled in the art, the present disclosure can have various modifications and changes. Any modification, equivalent replacement, and improvement made without departing from the spirit of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. A resource exclusion method for monitoring sidelink control information SCI, comprising: a first LTE-V2X terminal monitors SCI transmitted by a second LTE-V2X terminal within a sensing window, and for each available downlink subframe, the first LTE-V2X terminal decodes current sidelink control information SCI; obtaining resource reservation information of the second LTE-V2X terminal based on the current SCI scheduling type and transmission type; performing resource exclusion for candidate available resources in a future resource selection window based on the resource reservation information. A method.

2. 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 a resource reservation period range obtained by decoding the current SCI, where the scheduling type includes a periodic type and an event type. The method according to claim 1.

3. Obtaining the resource reservation information of the second LTE-V2X terminal based on the current SCI scheduling type and transmission type includes: when the scheduling type of the current SCI is the periodic type, determining the transmission type of the current SCI; when the transmission type of the current SCI is the first transmission, saving the data structure of the current SCI; further determining whether the resource occupancy position of the current SCI is the same as the resource occupancy of the historical SCI, and obtaining the resource reservation information.

4. Determining whether the resource occupancy position of the current SCI is the same as the resource occupancy of the historical SCI includes: calculating the time domain position of the subframe in the previous period based on the resource reservation period range of the current SCI and the current TDD subframe allocation ratio format; locating SCI data located at the time domain position of the subframe in the previous period in the sensing window; traversing all historical SCIs of the subframe in the previous period to determine whether the resource occupancy position of the historical SCI is the same as the resource occupancy position of the current SCI. The method according to claim 3.

5. After determining the current SCI transmission type, when the current SCI transmission type is retransmission, determine whether there is an initial transmission in the previous subframe where the SCI indicates the same frequency domain position; when there is an initial transmission in the previous subframe where the SCI indicates the same frequency domain position, further determine whether there is a retransmission at the same frequency domain position in the previous subframe, The method according to claim 4.

6. Excluding available resources of the future resource selection window based on the resource reservation information includes: when the resource reservation information indicates that the resource occupancy position of the historical SCI is the same as that of the current SCI, rejecting the historical SCI stored in the sensing window; when the resource reservation information indicates that there is a retransmission at the same frequency domain position, rejecting the retransmission SCI of the previous period stored in the sensing window and not saving the current retransmission SCI; when the resource reservation information indicates that there is no initial transmission in the previous period where the SCI indicates the same frequency domain position, saving the data structure of the current retransmission SCI, The method according to claim 3.

7. Excluding available resources of the future resource selection window based on the resource reservation information includes: when the resource reservation information indicates that the scheduling type of the current SCI is the event type and the transmission type is initial transmission, saving the data structure of the current SCI; when the resource reservation information indicates that the scheduling type of the current SCI is the event type and the transmission type is retransmission, not saving the data structure of the current SCI, The method according to claim 2.

8. The first LTE-V2X terminal monitors the SCI transmitted by the second LTE-V2X terminal within the sensing window. For each downlink available subframe, the first LTE-V2X terminal is equipped with a decoding module configured to decode the current sidelink control information SCI, and an acquisition module configured to acquire the resource reservation information of the second LTE-V2X terminal based on the scheduling type and transmission type of the current SCI. An exclusion module installed to perform exclusion of available resources for candidates of a future resource selection window based on the resource reservation information. A resource exclusion device that monitors side link control information SCI. **Claim 9** A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method according to any one of claims 1 to 7. **Claim 10** A memory, a processor, and a computer program stored in the memory and executable by the processor, wherein when the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented. An electronic device.

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