TWI687107B - Resource selection method and device - Google Patents

Abstract

The invention discloses a resource selection method and device. The terminal determines a set of candidate transmission resource blocks in the resource selection window according to the time-frequency resource pattern, the set of candidate transmission resource blocks includes at least one candidate transmission resource block, and the candidate transmission resource block is a transmission resource used on the through link, A candidate transmission resource block includes at least N time-frequency resources for data transmission, the N time-frequency resources are determined according to the time-frequency resource pattern, and N is an integer greater than or equal to 1; the terminal selects from the set of candidate transmission resources M candidate transmission resource blocks are selected as the transmission resources of the terminal on the through link, and M is an integer greater than or equal to 1.

Description

Resource selection method and device

The invention belongs to the technical field of wireless communication, and particularly relates to a resource selection method and device.

In V2X technology, V represents a vehicle, and X represents various entities, for example: V2V represents a vehicle to vehicle, V2P represents a vehicle to pedestrian, and V2I represents a vehicle to infrastructure. (vehicle to infrastructure), V2N means vehicle to network.

In a long term evolution (LTE) system, V2X technology mainly includes two communication methods: V2X direct communication and V2X indirect communication. Among them, V2X direct communication refers to direct communication between V2X terminals, and V2X indirect communication refers to indirect communication between V2X terminals through infrastructure (such as base stations or other network entities).

The V2X terminals communicate through a direct link (also called PC5 interface, which is described as Sidelink in the agreement). When a V2X terminal performs data transmission on a through link, two channels are related. One is a physical side link control channel (PSCCH), which is used to transmit scheduling assignment (SA) information; the other is Pass-through link shared channel (physical sidelink shared channel, PSSCH), also known as data channel, is used to transmit data. The SA information indicates all necessary instruction information for data reception, for example, time-frequency resource information occupied by data transmission, modulation and coding method of data transmission, and instruction information of the reference signal for demodulation of data transmission, etc. Correspondingly, the receiving end detects the SA information transmitted in the PSCCH channel and receives data according to the SA information.

The V2X terminal of the data sender can spontaneously select the time-frequency resources on the through link to send the data. With the development of V2X technology, a new resource selection method is currently needed to enable the V2X terminal of the data sender to select time-frequency resources on the through link for data transmission.

Embodiments of the present invention provide a resource selection method and device.

In the first aspect, a resource selection method is provided, including: The terminal determines a set of candidate transmission resource blocks in the resource selection window according to the time-frequency resource pattern, the set of candidate transmission resource blocks includes at least one candidate transmission resource block, and the candidate transmission resource block is a transmission resource used on the through link, A candidate transmission resource block includes at least N time-frequency resources for data transmission, the N time-frequency resources are determined according to the time-frequency resource pattern, and N is an integer greater than or equal to 1; The terminal selects M candidate transmission resource blocks from the set of candidate transmission resources as the transmission resources of the terminal on the through link, and M is an integer greater than or equal to 1.

Optionally, the time domains of at least 2 candidate transmission resource blocks in the set of candidate transmission resource blocks do not overlap.

Optionally, the terminal selects M candidates from the set of candidate transmission resource blocks Transmission resource blocks, including: the terminal excluding candidate transmission resource blocks from which the terminal has resource conflicts with other terminals from the candidate transmission resource block set; the terminal selecting M candidate transmission resource blocks from the excluded candidate transmission resource block set .

Optionally, excluding candidate transmission resource blocks in which the terminal and the other terminal have resource conflicts from the set of candidate transmission resource blocks include: determining interference time-frequency resources based on SA information sent by other terminals monitored in the perception window, The interference time-frequency resource is all or part of the time-frequency resource associated with the SA information; Exclude, from the set of candidate transmission resource blocks, the reserved time-frequency resources corresponding to the interference time-frequency resources and the interference time-frequency resources, partially or completely overlapping candidate transmission resource blocks from the set of candidate transmission resource blocks; The reservation time-frequency resource is determined according to the location of the interference time-frequency resource and the reservation period.

Optionally, the interference time-frequency resource is a time-frequency resource associated with the SA information, and the data channel reference signal received power is greater than the received power threshold time-frequency resource; after the exclusion, the method further includes: determining the set of candidate transmission resource blocks Whether the ratio of the number of time-frequency resources after elimination and before exclusion is lower than the set threshold, and if so, the received power threshold is increased, and the step of determining the interference time-frequency resource and the elimination step are performed again.

Optionally, it further includes: if the sensing window occupies the data transmission time-frequency resource occupied by the terminal, then in the candidate transmission resource block set, all possible reservation time-frequency resources corresponding to the data transmission time-frequency resource exist. Partial or all overlapping candidate transmission resource blocks are excluded from the set of candidate transmission resource blocks.

Optionally, selecting M candidate transmission resource blocks from the set of excluded candidate transmission resource blocks includes: according to the candidate transmission resources in the set of excluded candidate transmission resource blocks For the received signal strength on the block, M candidate transmission resource blocks are selected in the order of the received signal strength from small to large.

Optionally, the terminal selecting M candidate transmission resource blocks from the set of candidate transmission resource blocks includes: the terminal randomly selecting M candidate transmission resource blocks from the set of candidate transmission resource blocks; or, the terminal according to the candidate The received signal strength on the candidate transmission resource block in the set of transmission resource blocks, and M candidate transmission resource blocks are selected from the set of candidate transmission resource blocks.

In a second aspect, a resource selection device is provided, including: a determination module for determining a set of candidate transmission resource blocks in a resource selection window according to a time-frequency resource pattern, the set of candidate transmission resource blocks including at least one candidate transmission resource block , The candidate transmission resource block is a transmission resource used on the direct link, and one candidate transmission resource block includes at least N time-frequency resources for data transmission, and the N time-frequency resources are determined according to the time-frequency resource pattern, N is an integer greater than or equal to 1; a selection module is used to select M candidate transmission resource blocks from the set of candidate transmission resources as the transmission resources of the terminal on the through link, and M is an integer greater than or equal to 1.

Optionally, the time domains of at least 2 candidate transmission resource blocks in the set of candidate transmission resource blocks do not overlap.

Optionally, the selection module is specifically used to: exclude from the candidate transmission resource block set the candidate transmission resource block where the terminal has a resource conflict with other terminals; select M candidate transmissions from the excluded candidate transmission resource block set Resource block.

Optionally, the selection module is specifically used to determine interference time-frequency resources based on SA information sent by other terminals monitored in the perception window, and the interference time-frequency resources are the SA resources All or part of the time-frequency resources associated with the information; in the set of candidate transmission resource blocks, there are candidate transmissions that partially or all overlap in the reserved time-frequency resources corresponding to the interference time-frequency resources and the interference time-frequency resources Resource blocks are excluded from the set of candidate transmission resource blocks; where the reservation time-frequency resource is determined according to the location of the interference time-frequency resource and the reservation period.

Optionally, the interference time-frequency resource is a time-frequency resource in which the received power of the data channel reference signal is greater than the received power threshold among the time-frequency resources associated with the SA information; the selection module is also used to: determine the candidate transmission resource block Whether the ratio of the number of time-frequency resources after exclusion and before exclusion is lower than a set threshold, and if so, the received power threshold is raised, and the step of determining the interference time-frequency resource and the exclusion step are performed again.

Optionally, the selection module is also used for: if the perception window is in the data transmission time-frequency resource occupied by the terminal, all possible reservations corresponding to the data transmission time-frequency resource in the set of candidate transmission resource blocks For time-frequency resources, there are candidate transmission resource blocks that overlap partially or completely, and are excluded from the set of candidate transmission resource blocks.

Optionally, the selection module is specifically used to select M candidate transmission resource blocks according to the received signal strength on the candidate transmission resource blocks in the set of excluded candidate transmission resource blocks, in the order of decreasing received signal strength .

Optionally, the selection module is specifically used to: randomly select M candidate transmission resource blocks from the set of candidate transmission resource blocks; or, according to the received signal strength on the candidate transmission resource blocks in the set of candidate transmission resource blocks, M candidate transmission resource blocks are selected from the set of candidate transmission resource blocks.

In a third aspect, a communication device is provided, including: a processor, a memory, a transceiver, and a bus interface; the processor is used to read a program in the memory and perform the following operations Cheng: According to the time-frequency resource pattern, a set of candidate transmission resource blocks is determined in the resource selection window. The set of candidate transmission resource blocks includes at least one candidate transmission resource block. The candidate transmission resource block is a transmission resource used on the through link. The candidate transmission resource block includes at least N time-frequency resources for data transmission. The N time-frequency resources are determined according to the time-frequency resource pattern, and N is an integer greater than or equal to 1; M are selected from the set of candidate transmission resources The candidate transmission resource block is used as the transmission resource of the terminal on the through link, and M is an integer greater than or equal to 1.

Optionally, the time domains of at least 2 candidate transmission resource blocks in the set of candidate transmission resource blocks do not overlap.

Optionally, the processor is specifically configured to: exclude from the set of candidate transmission resource blocks candidate transmission resource blocks where the terminal has resource conflicts with other terminals; select M candidate transmission resources from the set of excluded candidate transmission resource blocks Piece.

Optionally, the processor is specifically configured to determine interference time-frequency resources based on SA information sent by other terminals monitored in the perception window, and the interference time-frequency resources are all of the time-frequency resources associated with the SA information Or part; in the set of candidate transmission resource blocks, there is a part or all of overlapping candidate transmission resource blocks corresponding to the interference time-frequency resources and the reserved time-frequency resources corresponding to the interference time-frequency resources, from the set of candidate transmission resource blocks Excluded; wherein, the reservation time-frequency resource is determined according to the location of the interference time-frequency resource and the reservation period.

Optionally, the interference time-frequency resource is a time-frequency resource in which the received power of the data channel reference signal is greater than the received power threshold among the time-frequency resources associated with the SA information; The processor is also used to determine whether the ratio of the number of time-frequency resources of the candidate set of transmission resource blocks after exclusion and before exclusion is lower than a set threshold, and if so, increase the received power threshold and execute the interference time-frequency determination again Resource steps and the exclusion step.

Optionally, the processor is further configured to: if the perception window is in the time-frequency resource of data transmission occupied by the terminal, all possible reservation times corresponding to the time-frequency resource of data transmission in the set of candidate transmission resource blocks Frequency resources, there are candidate transmission resource blocks that overlap partially or completely, and are excluded from the set of candidate transmission resource blocks.

Optionally, the processor is specifically configured to: according to the received signal strength on the candidate transmission resource blocks in the set of excluded candidate transmission resource blocks, select M candidate transmission resource blocks in descending order of received signal strength.

Optionally, the processor is specifically configured to: randomly select M candidate transmission resource blocks from the set of candidate transmission resource blocks; or, according to the received signal strength on the candidate transmission resource blocks in the set of candidate transmission resource blocks, from M candidate transmission resource blocks are selected from the set of candidate transmission resource blocks.

According to a fourth aspect, a computer storage medium is provided. The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to cause the computer to execute the method according to any possible solution in the first aspect.

In the above embodiment, the terminal determines the set of candidate transmission resource blocks in the resource selection window according to the time-frequency resource pattern, and selects M candidate transmission resource blocks from the set of candidate transmission resources as the transmission resources of the terminal on the through link. Among them, since a candidate transmission resource block includes at least N time-frequency resources for data transmission, compared with the prior art, the selected transmission resource on the through link has more flexibility to meet different services of demand. Especially when M is equal to 2 and N is greater than or equal to 2, compared with the prior art, when transmitting data according to the selected transmission resource, the reliability of the through link transmission can be improved and/or the coverage can be expanded.

S501~S502, S601~S602, S701~S703, S801~S804: steps

1001: Confirm module

1002: Select module

1101: processor

1102: Memory

1103: Transceiver

Figures 1-1 and 1-2 are schematic diagrams of network architectures applicable to embodiments of the present invention; Figure 2 is a schematic diagram of resources of a through link data transmission in the embodiments of the present invention; Figures 3-1 to 3-6 respectively FIG. 4 is a schematic diagram of data transmission resources in a through link provided by an embodiment of the present invention; FIG. 4 is a schematic diagram of transmitting SA information using the scheme 1 in the embodiment of the present invention; FIG. 5 is a schematic flowchart of a data transmission method according to an embodiment of the present invention FIG. 6 is a schematic diagram of a resource selection process provided by an embodiment of the present invention; FIG. 7 is a schematic diagram of a resource selection process provided by another embodiment of the present invention; FIG. 8 is a schematic diagram of a resource removal process provided by an embodiment of the present invention; Schematic diagram of resource selection in the embodiment; FIG. 10 is a schematic structural diagram of a resource selection apparatus provided in an embodiment of the present invention; FIG. 11 is a schematic structural diagram of a communication apparatus provided in an embodiment of the present invention.

Referring to FIGS. 1-1 and 1-2, respectively, this is a network architecture to which embodiments of the present invention are applicable.

As shown in Figure 1-1, the terminal uses a straight-through link Communicate with other terminals. Among them, the terminal can obtain the location of the idle resource through the method of perception in the configured or pre-configured resource pool, and select the resource used by itself to transmit the data among the idle resources. The terminal may also randomly select the resources used for transmitting data in the configured or pre-configured resource pool.

As shown in Figure 1-2, the terminal can use a direct link to communicate with other terminals based on the resources allocated by the base station. When the terminal is within the network coverage (that is, when the terminal is within the coverage of the base station), the base station can pass the downlink control channel of the cellular communication system, such as the physical downlink control channel (PDCCH) or extended physical downlink The control channel (enhanced physical downlink control channel, EPDCCH) schedules the direct link communication between terminals. In this case, the base station sends scheduling information (scheduling grant) to the terminal to indicate the resource location and the like transmitted by the terminal.

The above network architecture may be a car networking architecture, and the terminal therein may be a V2X terminal.

The above base stations specifically include but are not limited to: evolved Node B (evolved Node B) B, eNB), radio network controller (RNC), Node B (Node B, NB), base station controller (BSC), base transceiver station (BTS) , Home base station (for example, home evolved NodeB, or home Node B, HNB), base band unit (BBU), new air interface base station (g NodeB, gNB), transmission point (transmitting and receiving point, TRP) , Transmitting point (TP), mobile switching center, etc. Of course, the above base station can also be replaced by other access point equipment.

In the existing LTE V2X technology, a V2X terminal can transmit a data packet with a size of 50 bytes to 1200 bytes through a direct link. With the further development of IoV technology, new applications The continuous emergence of application scenarios (for example, vehicle formation, advanced driving, sensor information sharing, remote control and other applications), which puts forward higher requirements for data transmission between terminals and terminals based on the direct link The data packet is larger, the transmission reliability is higher, and the transmission distance is farther. However, for the need to transmit larger data packets, as well as to provide greater coverage and more reliable transmission, the existing technologies provide limited support capabilities and cannot meet new business requirements. For example, the existing LTE V2X technology can provide up to two transmissions (called initial transmission and retransmission). If more reliable and larger coverage is required, the modulation and coding scheme needs to be reduced. MCS) level. When the data packet is relatively large, lowering the MCS level cannot meet the requirements of providing a wider range of coverage and providing highly reliable transmission.

The embodiments of the present invention provide an enhanced data transmission method and a device that can implement the method, which can flexibly meet the requirements of different services for transmission reliability and/or coverage. Further, compared with Rel-14 V2X, it is not obvious Increased signaling overhead.

The following describes the embodiments of the present invention in detail with reference to the accompanying drawings.

In the embodiment of the present invention, when the terminal sends data on the through link, the terminal may send the data through M (M is an integer greater than or equal to 1) transmission resource blocks on the through link, where one transmission resource block includes N (N is Integer greater than or equal to 1) Time-frequency resources used for data transmission. Optionally, in some examples, M=2, N>1; in other examples, M>2, N? 1.

Wherein, the transmission resource block includes one or more time-frequency resources, and one time-frequency resource corresponds to one data transmission. A time-frequency resource may use a transmission time interval (transmission time interval, TTI) or sub-frame as a unit in the time domain, and of course, may also use a time unit of other length as a unit, which is not limited in this embodiment of the present invention. In the embodiment of the present invention, optionally, a time-frequency resource is a TTI or a sub-frame in the time domain. A time-frequency resource The domain may use a physical resource block (PRB) as a resource unit, or a PRB group (or subchannel) as a resource unit, and a PRB group may include multiple PRBs. Of course, frequency units of other sizes may also be used as frequency units, which is not limited in the embodiment of the present invention. In the embodiment of the present invention, optionally, one time-frequency resource occupies one or more PRBs or one or more sub-channels in the frequency domain.

In the frequency domain, the frequency resources occupied by the data sent by the terminal on the through link may be part or all of the frequency resources available on the downlink channel of the through link. Specifically, in the Internet of Vehicles, the resources occupied by one transmission resource block in the frequency domain may include: part of the resources in the frequency domain resource pool (that is, the frequency domain resource pool used to transmit SA information) usable by the PSCCH, and Some resources in the frequency domain resource pool (that is, the frequency domain resource pool used for transmitting data) used by the PSSCH.

Optionally, in some embodiments, in the case where N is greater than or equal to 2, N time-frequency resources in one transmission resource block correspond to the same data packet, such as passing N time-frequency resources in one transmission resource block The same data packet is repeatedly sent N times, one time-frequency resource corresponds to one transmission, and each time a different automatic hybrid repeat request (HARQ) version of the data packet is sent, so that the receiving end can be based on N time-frequency The data transmitted by the resource is subjected to HARQ combining processing to obtain transmission gain.

Optionally, in some embodiments, in the case where M is greater than or equal to 2, M transmission resource blocks may correspond to the same data packet, or may correspond to different data packets. For example, when M=2, the first transmission resource block is used to transmit data packet 1, and the second transmission resource block is used to transmit data packet 2; or, both transmission resource blocks are used to transmit data packet 1, where The two transmission resource blocks transmit different HARQ versions of the data packet. If M transmission resource blocks correspond to For the same data packet, the receiving end can perform HARQ combining processing based on the data sent by the M transmission resource blocks, thereby obtaining a transmission gain.

Based on the above embodiments of the present invention, for the same data packet, the data transmission of the terminal on the through link may have one or more of the following characteristics: (1) The number of transmission resource blocks (that is, the value of M) used by the terminal to send data packets on the through link is greater than 2, so that even if a transmission resource block contains only one time-frequency resource, and the time-frequency resource The size is the same as the size of the time-frequency resource used for one data transmission in the existing LTE V2X technology. Compared with the prior art, the embodiment of the present invention also has more transmission times (one time-frequency resource corresponds to one data transmission), so it can be obtained Higher transmission reliability; (2) The number of time-frequency resources used for data transmission in a transmission resource block is greater than 1 (that is, the value of N is greater than or equal to 2), so that even if the number of transmission resource blocks (that is, the number of data transmissions) is the same as the existing LTE V2X technology The number of data transmissions in is the same. Compared with the prior art, the time length of the data packet sent in this embodiment of the present invention is also longer than the time length of the data packet sent in the prior art, so that the reliability of transmission can be improved.

It can be seen that in the above embodiment, when the terminal sends data on the direct link, M transmission resource blocks are sent, and one of the transmission resource blocks includes at least N time-frequency resources for data transmission, thereby achieving direct communication between the terminals , And provides flexible transmission resource configuration to meet the needs of different services. Especially when M is equal to 2 and N is greater than or equal to 2, compared with the prior art, with little increase in signaling, it is possible to improve the transmission reliability of the through link and/or expand the coverage.

Based on the above-mentioned embodiment, FIG. 2 exemplarily shows a schematic diagram of a resource of a direct link data transmission in an embodiment of the present invention. As shown in the figure, a V2X terminal is on the through link When transmitting data, two transmission resource blocks (such as the first transmission resource block and the second transmission resource block in the figure) are used, and each transmission resource block contains 4 time-frequency resources for data transmission. Among them, a time-frequency resource is a TTI length in the time domain, and one or more PRBs or sub-channels can be occupied in the frequency domain. In a time-frequency resource, it includes PSCCH for transmitting SA information and PSSCH for transmitting data. Among them, the frequency resource of the PSCCH can be selected from the SA resource pool, and the frequency resource of the PSSCH can be selected from the data resource pool. The SA information on each time-frequency resource in a transmission resource block is used to indicate the transmission resource (such as the frequency domain position of the PSSCH) used by the associated data.

FIG. 2 is only an example. The embodiment of the present invention does not limit the frequency domain positions of the PSCCH and PSSCH, and does not limit whether the content of the SA transmitted in the PSCCH in each time-frequency resource is the same.

Optionally, in the embodiment of the present invention, the frequency domain size of time-frequency resources in different transmission resource blocks may be the same or different. For example, taking FIG. 2 as an example, the number of PRBs occupied by the PSSCH in the first transmission resource block and the number of PRBs occupied by the PSSCH in the second transmission resource may or may not be equal.

Optionally, in the embodiment of the present invention, the time interval between different transmission resource blocks does not exceed the set duration. For example, still taking FIG. 2 as an example, the time interval between the first transmission resource block and the second transmission resource block does not exceed X TTIs, X is an integer greater than or equal to 1, and the value of X can be agreed by the system or configured by the system .

Optionally, in the embodiment of the present invention, time-frequency resources of different transmission resource blocks may be independently selected, so that there is no association relationship between time-domain positions and/or frequency-domain positions of different transmission resource blocks. For example, in the case of transmitting two data packets, the transmission used by the two data packets The frequency domain size of the resource blocks may be different; considering the signaling indication overhead, optionally, the time interval between two transmission resource blocks may be limited to not exceed a fixed duration. In another example, there may be an association relationship between time domain positions and/or frequency domain positions of different transmission resource blocks, and the association relationship may be a loosely coupled association relationship. For example, the time interval between each transmission resource block does not exceed the set duration, and/or the frequency domain resource of each transmission resource block is the same.

Optionally, in the embodiment of the present invention, in a case where N is greater than or equal to 2, there is an association relationship between time domain positions and/or frequency domain positions of N time-frequency resources in one transmission resource block, that is, such The association relationship may be only in the frequency domain, or only in the time domain, or may be a two-dimensional joint of the time domain and the frequency domain. Different association methods or different association relationships may correspond to corresponding time-frequency resource patterns. The time-frequency resource pattern defines the position and size of the time-frequency resource, and different time-frequency resource patterns correspond to different association relationships. In the following, in conjunction with FIGS. 3-1 to 3-6, several possible forms of association relationships between time domain positions and/or frequency domain positions of N time-frequency resources in a transmission resource block are illustrated: (1) N time-frequency resources are continuous in the time domain and the same in the frequency domain. Figure 3-1 exemplarily shows a corresponding pattern of time-frequency resources. As shown in the figure, one transmission resource block includes 4 time-frequency resources, and these 4 time-frequency resources occupy 4 consecutive TTIs, each The time-frequency resource occupies 1 TTI in the time domain, and the PSCCH and PSSCH frequency domain positions and sizes of the four time-frequency resources are the same; (2) N time-frequency resources are continuous in the time domain, and at least two time-frequency resources have different frequency-domain resources (such as different frequency-domain positions and/or different frequency-domain sizes), for example, the N number in the frequency domain The time-frequency resource can be frequency-hopped according to the set time-frequency resource pattern. There can be many patterns of time-frequency resources that can be used. All or part of all possible time-frequency resource patterns may form a set of time-frequency resource patterns, and the terminal of the data sender may use the time-frequency resource patterns in the set to determine the time-frequency resources for data transmission. There may be a correspondence between the number of time-frequency resource patterns in the set and the value of N, and the correspondence may be agreed by the protocol or configured. That is, for each value of N, a corresponding set of time-frequency resource patterns can be set.

；以此類推，可得到當N=3,4時，對應的時頻資源圖樣個數。 The following illustrates the relationship between the value of N and the number of time-frequency resource patterns: Taking time-domain frequency hopping in a time window as an example, the time window includes 8 TTIs, when N=1, The number of time-frequency resource patterns is 8; when N=2, the number of time-frequency resource patterns is 28, which is equivalent to the number of TTI combinations obtained by randomly selecting 2 TTIs from 8 TTIs, which can be expressed as

; By analogy, the number of corresponding time-frequency resource patterns can be obtained when N=3,4.

In SA information, the value of N and the index value of the time-frequency resource pattern can be jointly indicated. For example, the time-frequency resource patterns for N=1, N=2, N=3, and N=4 are organized into a set in a certain order, and the time-frequency resource patterns in the set are indexed. Such a time-frequency resource pattern is in the The index value in the set can indicate either the value of N or the time-frequency resource pattern. For example, the time-frequency resource patterns when N=1, N=2, N=3, and N=4 form a set in the order of N=1, N=2, N=3, and N=4. The first 8 time-frequency resource patterns represent the time-frequency resource patterns when N=1, starting from the 9th time-frequency resource pattern to the 36th time-frequency resource pattern when N=2, and so on.

Further, in this association mode, the N time-frequency resources adopt frequency hopping in the frequency domain, and the available time-frequency resource pattern is related to the size of the frequency domain resources occupied by the data packet. For example, if the frequency domain of each time-frequency resource is continuous, the size of different time-frequency resources will affect the selection of the time-frequency resource pattern.

Figure 3-2 exemplarily shows one of the time-frequency resource patterns, as shown in the figure, A transmission resource block includes 4 time-frequency resources. The 4 time-frequency resources occupy 4 consecutive TTIs. Each time-frequency resource occupies 1 TTI in the time domain. The PSCCH frequency domain of these 4 time-frequency resources The positions are different, and the PSSCH frequency domain positions of the four time-frequency resources are different. Figure 3-2 is only an example. In another example, the frequency domain positions and sizes of the PSCCHs of the four time-frequency resources may be the same, while the frequency domain positions of the PSSCHs are different.

(3) At least 2 of the N time-frequency resources are not continuous in the time domain, and the N time-frequency resources are the same in the frequency domain. For example, the N time-frequency resources in the time domain may be Perform frequency hopping on the set time-frequency resource pattern. There are many patterns of time-frequency resources that can be used. All or part of all possible time-frequency resource patterns may form a set of time-frequency resource patterns, and the terminal of the data sender may use the time-frequency resource patterns in the set to determine the time-frequency resources for data transmission. There may be a correspondence between the number of time-frequency resource patterns in the set and the value of N, and the correspondence may be agreed by the protocol or configured. That is, for each value of N, a corresponding set of time-frequency resource patterns can be set.

Figure 3-3 exemplarily shows one of the time-frequency resource patterns. As shown in the figure, one transmission resource block includes 4 time-frequency resources, and each time-frequency resource occupies 1 TTI in the time domain. The adjacent two time-frequency resources are separated by 1 TTI, and the frequency domain positions and sizes of the PSCCH and PSSCH of these four time-frequency resources are the same. Figure 3-4 exemplarily shows another time-frequency resource pattern. As shown in the figure, one transmission resource block includes 4 time-frequency resources, and each time-frequency resource occupies 1 TTI in the time domain. The first The second and second time-frequency resources are continuous in the time domain, the third and fourth time-frequency resources are continuous in the time domain, and the second and third time-frequency resources are separated by 2 TTIs. The frequency domain positions and sizes of the PSCCH and PSSCH of the time-frequency resource are the same.

(4) At least 2 of the N time-frequency resources are not continuous in the time domain, And at least 2 of the N time-frequency resources have different frequency-domain resources (such as different frequency-domain positions and/or frequency-domain sizes), for example, the N time-frequency resources are in the time domain and the frequency domain Joint frequency hopping is performed according to the set time-frequency resource pattern. There may be multiple patterns of time-frequency resources that conform to this association relationship. All or part of all possible time-frequency resource patterns may form a set of time-frequency resource patterns, and the terminal of the data sender may use the time-frequency resource patterns in the set to determine the time-frequency resources for data transmission. There may be a correspondence between the number of time-frequency resource patterns in the set and the value of N, and the correspondence may be agreed by the protocol or configured. That is, for each value of N, a corresponding set of time-frequency resource patterns can be set.

Further, in this association mode, the N time-frequency resources adopt frequency hopping in the frequency domain, and the available time-frequency resource pattern is related to the size of the frequency domain resources occupied by the data packet. For example, if the frequency domain of each time-frequency resource is continuous, the size of different time-frequency resources will affect the selection of the time-frequency resource pattern.

Figure 3-5 exemplarily shows one of the time-frequency resource patterns. As shown in the figure, one transmission resource block includes 4 time-frequency resources, and each time-frequency resource occupies 1 TTI in the time domain. There is a TTI between two adjacent time-frequency resources. The frequency domain positions of the PSCCHs of the four time-frequency resources are different, and the frequency domain positions of the PSSCHs of the four time-frequency resources are different. 3-6 exemplarily show another pattern of time-frequency resources. As shown in the figure, one transmission resource block includes 4 time-frequency resources, and each time-frequency resource occupies 1 TTI in the time domain. The first The second and second time-frequency resources are continuous in the time domain, the third and fourth time-frequency resources are continuous in the time domain, and the second and third time-frequency resources are separated by 2 TTIs. The frequency domain positions of the PSCCH of the time-frequency resources are different, and the frequency domain positions of the PSSCH of the four time-frequency resources are different.

In the embodiment of the present invention, the number of transmission resource blocks (that is, the value of M) can be It is configured by the system, it can also be pre-configured, or it can be determined dynamically (for example, by the base station or by the terminal of the data sender); the number of time-frequency resources contained in a transmission resource block (ie The value of N) can be configured by the system, it can be pre-configured, or it can be determined dynamically (for example, by the base station or by the terminal of the data sender). Among them, in an example where the values of M and/or N are configured by the system, network equipment (such as a base station) can be configured based on the terminal, for example, the network equipment configures M and/or N in a semi-static manner Value, and send the configured values of M and/or N to the terminal through radio resource control (RRC) signaling; in another example where the values of M and/or N are configured by the system , The network equipment configures the same value of M and/or N for all terminals, and notifies the terminals by broadcasting. In an example where the values of M and/or N are pre-configured, the values of M and/or N may be pre-agreed in the protocol. In an example where the values of M and/or N are determined dynamically, a network device (such as a base station) can send the values of M and/or N to the terminal through downlink control information (DCI) , Where the base station can determine the value of M and/or N according to the service type or service priority; in another example where the value of M and/or N is determined dynamically, the terminal of the data sender can transmit The business type or business priority to which the data belongs determines the value of M and/or N. In another example, the corresponding resource pool can be set according to different transmission times in advance, and the data sender terminal or base station can select time-frequency resources from the corresponding resource pool according to the data transmission times to determine the through link for the data sender terminal Sending resources on the road.

If the value of M is configured or pre-configured by the system, you do not need to carry the value of M in the SA information; Similarly, if the value of N is configured or pre-configured by the system , You do not need to carry the value of N with SA information. If the value of M is dynamic If the status is determined, the value of M can be indicated in an explicit or implicit manner through SA information; in the same way, if the value of N is dynamically determined, the value of N can be determined through SA information The value is indicated in an explicit or implicit manner. By determining the value of M and/or N in a dynamic manner and indicating it through SA information, the dynamic change of M and/or N can be achieved and the flexibility of the system is improved.

The following exemplarily shows several configuration methods and indication methods of M and N: Method 1: The values of M and N are all configured by the system, and the SA information may or may not carry the indication of the values of M and N Information, you can also notify the terminal of the values of M and N through other signaling; further, when the values of M and N are notified, the values of M and N can be jointly indicated to reduce signaling overhead; method 2: The values of M and N are pre-configured. The SA information may or may not carry the indication information of the values of M and N, and may also notify the terminal of the values of M and N through other signaling; further , When the values of M and N are notified, the values of M and N can be jointly indicated to reduce signaling overhead; Method 3: The value of M is configured or pre-configured by the system, and the value of N is dynamically configured , SA information may not carry the indication information of the value of M, the value of N is carried in the SA information; Method 4: The value of M is determined dynamically, the value of N is determined by system configuration or pre-configuration, the value of M The value is carried in the SA information, and the SA information may not carry the indication information of the value of N; Method 5: The values of M and N are determined dynamically, so they are both carried in the SA information; further, in the SA information, The values of M and N can be jointly indicated to reduce signaling overhead.

Optionally, the value of M and/or the value of N may be related to the service type or service Priority is related. For terminals that require high reliability, you can increase the number of data retransmissions by increasing one of M or N to achieve the purpose of improving reliability. For example, you can increase N by fixing N when the value of M is fixed. To improve the reliability of transmission. Compared with increasing the value of M, this method can reduce signaling overhead. As an example, in the case where the value of M is 2, since different service types or different service priorities have different requirements for transmission reliability, the terminal may determine the value of N according to the service type or service priority.

Optionally, the correspondence between the service type or service priority order and the number of transmission resource blocks (that is, the value of M) may be pre-defined, and/or the service type or service priority order and the time included in a transmission resource block Correspondence between the number of frequency resources (that is, the value of N). Since the value of M and/or N can correspond to the business type or business priority, in the case of SA information carrying business priority information or business type information, it is not necessary to carry M and/or N in SA information Value, but the value of M and/or N is implicitly indicated by business priority information or business type information, and the value of M and/or N can be determined according to business priority information or business type information.

Correspondingly, if the SA information of the sender terminal includes service priority order information or service type information, and the service priority order or service type has a one-to-one correspondence with the value of M or N, the receiver terminal can use the SA The business priority information or business type information in the information determines the value of M or N. In specific implementation, the correspondence between the service priority order or service type and the value of N can be set.

In the embodiment of the present invention, the data sent by the data sending terminal includes SA information and data related to the SA information. Among them, the location of the SA information and the included The content can be realized by the following scheme.

Scenario 1: In each transmission resource block, SA information is sent on only one of the N time-frequency resources contained in the transmission resource block, that is, only one associated SA information is sent with each transmission resource block. FIG. 4 exemplarily shows a schematic diagram of sending SA information by using the scheme 1. As shown in the figure, the data sending terminal sends data on the direct link through 2 transmission resource blocks. Each transmission resource block includes 4 time-frequency resources, and the length of each time-frequency resource in the time domain is one TTI. For each transmission resource block, SA information is sent only in the first TTI in the transmission resource block.

In an example of adopting the scheme 1, the SA information includes at least: time-frequency resource indication information of the transmission resource block, and the indication information can pass the first time-frequency resource of the N time-frequency resources included in the transmission resource block Location characterization. The positions of the N time-frequency resources included in the transmission resource block may be determined according to the position of the first time-frequency resource and the time-frequency resource pattern of the N time-frequency resources. The index value of the time-frequency resource pattern of the N time-frequency resources may be carried in the SA information. When the index values of the time-frequency resource patterns of the N time-frequency resources are pre-configured or pre-agreed, the SA information may not carry the index values of the time-frequency resource patterns of the N time-frequency resources.

Scenario 2: In a transmission resource block, SA information is sent on each of the N time-frequency resources included in the transmission resource block, that is, each time-frequency resource in each transmission resource block is sent The information is accompanied by an SA message. An example of this solution can be shown in Figure 2. The data sender terminal sends data on the direct link through 2 transmission resource blocks. Each transmission resource block includes 4 time-frequency resources, and each time-frequency resource is in the time domain. The length above is one TTI. For each transmission resource block, SA information is sent in each TTI in the transmission resource block. different In TTI, the frequency domain positions occupied by SA information can be the same or different.

In an example of using scheme 2, if time-frequency resource A represents any time-frequency resource in a transmission resource block, then the SA information sent on time-frequency resource A in the transmission resource block includes at least: the transmission resource block’s The time-frequency resource indication information and the time-frequency resource A are indication information of the number of time-frequency resources in the transmission resource block. Wherein, the time-frequency resource indication information of the transmission resource block can be characterized by the position of the first time-frequency resource among the N time-frequency resources included in the transmission resource block. The location of the time-frequency resource A can be based on the location of the first time-frequency resource, the time-frequency resource A is the indication information of the number of time-frequency resources in the transmission resource block, and the N time-frequency resources included in the transmission resource block The time-frequency resource pattern is determined. The index value of the time-frequency resource pattern of the N time-frequency resources may be carried in the SA information. When the index values of the time-frequency resource patterns of the N time-frequency resources are pre-configured or pre-agreed, the SA information may not carry the index values of the time-frequency resource patterns of the N time-frequency resources.

In another example of using scheme 2, if time-frequency resource A represents any time-frequency resource in a transmission resource block, then the SA information sent on time-frequency resource A in the transmission resource block includes at least: time-frequency resource A , The time-frequency resource A is the indication information of the number of time-frequency resources in the transmission resource block. The location of the time-frequency resource A can be determined according to the indication information of the time-frequency resource A in the transmission resource block and the time-frequency resource pattern of the N time-frequency resources included in the transmission resource block. With this method, when a new terminal (a terminal in the embodiment of the present invention) coexists with a legacy terminal, the traditional terminal can determine transmission resources according to the SA information of the new terminal, so that the transmission resources of the direct link can be performed Avoid resource conflicts when choosing.

According to the above embodiment, the location of a transmission resource block can be determined by the transmission resource The location of the first time-frequency resource in the block is indicated. Specifically, the position of the first time-frequency resource in a transmission resource block can be indicated by the time-domain and frequency-domain resource positions, respectively, as follows: The frequency domain resource position of the first time-frequency resource in a transmission resource block may be in units of PRBs, or it may be a unit of PRB groups (or subchannels). If continuous frequency domain resources are occupied, it can be simplified to the starting point of the frequency domain and the length of the occupied frequency domain resources (such as how many PRBs or how many sub-channels). The positions of multiple transmission resource blocks may be jointly indicated or independently indicated.

The time-domain resource position of the first time-frequency resource in a transmission resource block can be indicated in the following manner: Method 1: The number of TTI offsets from the first transmission resource block is used for indication. The system needs to indicate M-1 Offset values. When M=1, it is equivalent to only one data transmission, then the value of the offset value is 0; Method 2: The TTI offset from the previous transmission resource block is used to indicate, the system needs to indicate M-1 Offset values. When M=1, it is equivalent to only one data transmission, then the offset value is 0; Method 3: Determined by the index value of the time-frequency resource pattern in a fixed-length time window starting from the reference TTI For example, if the window length is 8, there are M transmission resource blocks, and M is less than or equal to 8, then the maximum number of time-frequency resource patterns of the window is equivalent to arbitrarily selecting M from 8 TTIs, and the index of each time-frequency resource pattern Corresponding to a kind of time-frequency resource pattern. The index of at least one time-frequency resource pattern is used to indicate the case where M is equal to 1.

Through the above method for indicating the time domain resources of the transmission resource block, it can be implicitly Indicates the value of M.

According to the foregoing embodiment, the method of configuring and/or indicating the SA information is different, and the method of determining the location of the time-frequency resource in a transmission resource block may also be different, such as the above-mentioned solution 1 and solution 2. Further, the method for determining the position of the time-frequency resources in one transmission resource block may also be related to the number of time-frequency resource patterns used by the N time-frequency resources in one transmission resource block. For example, taking the time-frequency resource pattern shown in FIG. 3-1 as an example, since there is only one type of time-frequency resource pattern, there is no need to indicate through signaling, and the terminal of the data receiving terminal can use the time-frequency resource pattern (the time-frequency resource The pattern can be agreed in advance) and the content carried in the SA information (such as the location of the first time-frequency resource and the indication information of the number of time-frequency resources in the transmission resource block where the time-frequency resource is located) determine the corresponding time-frequency resource position. For a case where multiple time-frequency resource patterns can be selected for use, the time-frequency resource pattern index value may be further combined to determine the location of the time-frequency resource.

According to the foregoing embodiment, the SA information may include indication information that the current data transmission is the number of data transmissions. For example, the indication information may specifically be used to indicate that the TTI currently performing data transmission is the number of TTIs in the transmission resource block. Instructions. The indication information may also be indication information of the HARQ redundancy version. For example, if there is an agreed relationship between the HARQ redundancy version and the number of transmissions, the two are equivalent. For example, if a fixed sequence of HARQ redundancy versions is configured, the corresponding HARQ redundancy version can be determined according to the instruction information.

Further, based on the SA information sent in the above scheme 1 or scheme 2, the SA information may also include one or more of the following information: (1) a time-frequency resource belongs to the first of M transmission resource blocks Indication information for several transmission resource blocks. For example, the indication information may indicate that the current time-frequency resource (such as the time-frequency resource associated with SA information) belongs to the number of transmission resource blocks among the M transmission resource blocks; (2) The indication information of the number of transmission resource blocks (that is, the value of M). As described in the foregoing embodiment, the SA information may or may not carry the indication information, and the value of M may also be implicitly indicated according to other information carried in the SA information (such as service priority order information), or may be indicated by each The indication method of the time-domain resources of each transmission resource block implicitly indicates the value of M; (3) The indication information of the number of time-frequency resources (that is, the value of N) included in one transmission resource block for data transmission . As described in the foregoing embodiment, the SA information may or may not carry the indication information, and the value of N may also be implicitly indicated according to other information (such as service priority order information) carried in the SA information.

Further, the SA information may also include one or any combination of the following information: (4) Business priority information or business type information. The service priority order may include multiple types, such as 8 types. In this case, the length of the information may be 3 bits; (5) Resource reservation period index value. The length of the index value may be 4 bits, which is used to indicate the resource reservation period, that is, the resource indicated by the current SA information will continue to be used in the next reservation period. The corresponding relationship between the index value of the resource reservation period and the resource reservation period can be configured by high-level signaling; (6) Retransmitting the location indication information of the occupied frequency domain resource, which may specifically be the starting point and length of the frequency domain resource. The length of the indication information can be up to 8 bits, which is used to indicate the frequency resources occupied by the data of the initial transmission and retransmission indicated by the current SA information; (7) The time interval of the initial transmission/retransmission, the length of the indication information can be It is 4 bits, when there is only one transmission, the value of the indication information is 0; (8) Modulation and coding scheme (MCS), the length of the information can be 5 bits; (9) Retransmission instruction, the length of the information can be 1 bit, used to indicate whether the data associated with the current SA information is the initial transmission or retransmission.

Based on the straight-through link resources used for data transmission described in the above embodiments, the embodiments of the present invention provide a data transmission method. Referring to FIG. 5, it is a schematic flowchart of a data transmission method according to an embodiment of the present invention. As shown in the figure, the process may include: S501: A terminal determines a transmission resource on a through link.

In this step, the terminal may determine the transmission resources on the through link based on the method of spontaneous selection, or may obtain the transmission resources on the through link allocated by the base station based on the method of base station allocation.

Wherein, if the terminal determines the transmission resources on the through link based on the spontaneous selection, the method provided by the prior art may be used for resource selection, or the method provided by the embodiment of the present invention may be used for resource selection (for the method, see FIG. 7). .

If the terminal obtains transmission resources on the through link based on the allocation method of the base station, the downlink control information (DCI) sent by the base station to the terminal may include one or more of the following information, so that the terminal The information is carried in SA information: (1) Time-frequency resource location indication information of M transmission resource blocks, the time-frequency resource location of one transmission resource block is the first time through the N time-frequency resources in the transmission resource block The position of the frequency resource is characterized; (2) Time-frequency resource position indication information of N time-frequency resources in each transmission resource block.

The specific implementation manners of the above two kinds of indication information can be referred to the foregoing embodiments, and will not be repeated here.

S502: The terminal sends data on M transmission resource blocks of the through link according to the transmission resources determined in S501, where one transmission resource block includes at least N time-frequency resources for data transmission.

For the time-frequency resources used by the data sending terminal on the direct link for the data, refer to the description of the foregoing embodiment, which will not be repeated here.

For the receiving end, it receives the scheduling allocation information SA transmitted on the through link, and receives data on the M transmission resource blocks of the through link according to the SA information, where at least N of one transmission resource block is used for data transmission Time-frequency resources. Wherein, the same as or corresponding to the foregoing embodiments will not be repeated.

In order to more clearly understand the solutions provided by the embodiments of the present invention, the following uses several specific application scenarios as examples for description.

Scenario 1: The maximum value of M is 2, and N can be a changed value (that is, it can be dynamically determined). The time-frequency resource patterns of the N time-frequency resources in one transmission resource block adopt the manner shown in FIG. 3-1, and the M transmission resource blocks transmit the same data packet. If the design of SA information in Rel-14 LTE V2X is followed, and SA information and its associated data are transmitted in the same TTI, the information that can be transmitted through SA information provided by the embodiments of the present invention is as follows:-Service priority Information;-Resource reservation cycle index value: used to indicate the resource reservation cycle, that is, the resource indicated by the current SA information will continue to be used in the next reservation cycle. The corresponding relationship between the index value of the resource reservation period and the resource reservation period is configured by high-level signaling;-The frequency domain resource indication information of the second transmission resource block, because M=2, it can be considered to reuse the Rel-14 SA Definition of the frequency domain resource location occupied by transmission; -The TTI interval between the first transmission resource block and the second transmission resource block, because M=2, it can be considered to reuse the definition of the initial transmission/retransmission time interval in Rel-14 SA, if it is 0, Indicates that there is currently only the first transmission;-Modulation and coding mode indication;-Identification information of the first/second transmission resource block: 1 bit, indicating whether the current transmission resource block is the first transmission resource block or the second transmission Transmission resource block. Because M=2, it can be considered to reuse the definition of the identification information that can be reused for initial transmission/retransmission in Rel-14 SA;-The number of time-frequency resources contained in the transmission resource block N, here two transmission resource blocks are considered The number of time-frequency resources included is the same;-The indication information of the number of current transmission resources indicates the number of time-frequency resources of the current transmission resource block.

Scenario 2: The maximum value of M is 2, and N can be a variable value (that is, it can be dynamically determined). The time-frequency resource pattern of N time-frequency resources in a transport block adopts one of Figures 3-2 to 3-6 , And M transmission resource blocks transmit the same data packet. Following the design of SA in Rel-14 LTE V2X, and SA information and associated data are transmitted in the same TTI, the content carried by SA information in the embodiment of the present invention can add the following information on the basis of scenario 1 above:- Indication information of time-frequency resource patterns of N time-frequency resources in the first transmission resource block;-Indication information of time-frequency resource patterns of N time-frequency resources in the second transmission resource block.

Among them, the size of the indication information signaling overhead of the time-frequency resource pattern is directly related to the number of time-frequency resource patterns.

Scenario 3: The maximum value of M is 2, N can be a variable value (that is, it can be dynamically determined), the time-frequency resource pattern of N time-frequency resources in a transmission resource block adopts the method shown in FIG. 3-1, and M The transmission resource blocks can transmit different data packets. Following the design of SA in Rel-14 LTE V2X, and the SA information and associated data are transmitted in the same TTI, the SA information adds the following information on the basis of the information carried in Example 1:-Initial transmission/retransmission Indication information: 1 bit, used to indicate whether the current transmission resource block is an initial transmission or a retransmission.

Among them, the size of the indication information signaling overhead of the time-frequency resource pattern is directly related to the number of time-frequency resource patterns.

The embodiment of the present invention also provides a method for the data sending terminal to spontaneously select the data sending resource on the through link. In the embodiment of the present invention, the terminal may select M transmission resource blocks for data transmission. The terminology related to the following embodiments is consistent with the meaning of the foregoing embodiments. For example, related definitions of transmission resource blocks, included time-frequency resources, and definitions of time-frequency resource patterns can be found in the foregoing embodiments.

In general, the embodiments of the present invention provide two resource selection solutions.

Resource choice one

The terminal can select M*N time-frequency resources, and sort the selected M*N time-frequency resources in time. The sorted M*N time-frequency resources are represented as t ₁ ,..., t _{M * N} , for the sorted M*N time-frequency resources, each N time-frequency resources constitute a transmission resource block, and M transmission resource blocks are obtained, and the TTI corresponding to the M transmission resource blocks is expressed as { t ₁ ,. .., t _N },{ t _{N +1} ,..., t _{2 N} },...,{ t _{( M -1)* N +1} ,..., t _{M * N} }. The M transmission resource blocks are resources selected by the sender terminal for sending data.

Optionally, the above M*N time-frequency resources may satisfy certain constraints in the time domain, for example, different time-frequency resources are in different TTIs, and the TTI interval between any two time-frequency resources is less than one Set value.

Using the above scheme one for resource selection can realize a flexible resource selection method.

Resource selection scheme two

In this solution, N time-frequency resources in each transmission resource block can be selected according to the time-frequency resource pattern, M transmission resource blocks can be independently selected, or a transmission resource block can be selected according to the transmission resources. The constraint condition between the blocks selects other transmission resource blocks. For example, the constraint condition may be that the time windows of any two transmission resource blocks do not overlap in time.

Since a candidate transmission resource block includes at least N time-frequency resources for data transmission, compared with the prior art, the selected transmission resource on the direct link has more flexibility to meet the needs of different services . Especially when M is equal to 2 and N is greater than or equal to 2, compared with the prior art, when transmitting data according to the selected transmission resource, the reliability of the through link transmission can be improved and/or the coverage can be expanded.

Referring to FIG. 6, it is a schematic diagram of a resource selection process provided by an embodiment of the present invention. As shown in the figure, the process may include: S601: The terminal determines a set of candidate transmission resource blocks in the resource selection window according to the time-frequency resource pattern. Among them, the set of candidate transmission resource blocks includes at least one candidate transmission resource block, the candidate transmission resource block is a transmission resource used on the through link, and one candidate transmission resource block includes at least N time-frequency resources used for data transmission, The N time-frequency resources are determined according to the time-frequency resource pattern, and N is an integer greater than or equal to 1.

Among them, the length of the resource selection window is related to the maximum delay of the service.

Optionally, the time domains of at least 2 candidate transmission resource blocks in the set of candidate transmission resource blocks do not overlap. For example, the set of candidate transmission resource blocks includes a first candidate transmission resource block and a second candidate transmission resource block. The two candidate transmission resource blocks may be as shown in FIG. 2, where the first candidate transmission resource block and the second candidate transmission resource block The two candidate transmission resource blocks have a time domain length of 4 TTIs respectively, and the first candidate transmission resource block and the second candidate transmission resource block do not overlap in the time domain.

Take the time-frequency resource pattern shown in Figure 3-1 as an example, and perform resource selection in the sub-channel range of frequency domain numbers from 0 to 19. The resource selection window includes 20 TTIs in the time domain and one transmission resource. The block occupies 4 sub-channels in the frequency domain. For this situation, in specific implementation, the set of candidate transmission resource blocks can be determined in the following manner:

A selection window can be set first, and the size of the window is the same as the size of a transmission resource block. In this example, the selection window is 4 TTIs in the time domain and 4 sub-channels in the frequency domain. The time-frequency resource pattern shown in 1.

When performing resource selection, on the TTIs numbered 0 to 3 in the resource selection window, slide the selection window from the subchannel numbered 0 and slide it in the direction of high frequency with 1 subchannel step, thus obtaining 17 candidates Transmission resource blocks, these 17 candidate transmission resource blocks all occupy TTIs numbered 0 to 3, and the subchannel numbers occupied in the frequency domain are: 0-3, 1-4, 2-5, ..., 16- 19. And the positions of the four time-frequency resources in the 17 candidate transmission resource blocks are all consistent with the time-frequency resource pattern shown in FIG. 3-1.

In the same way, on the TTIs numbered 1 to 4 in the resource selection window, 17 candidate transmission resource blocks are determined. By analogy, on the TTIs numbered 2 to 5 in the resource selection window, 17 candidate transmission resource blocks are identified until the resource selection window In the TTIs within the numbers 16 to 19, 17 candidate transmission resource blocks are identified. All or part of the candidate transmission resource blocks determined in the above manner may constitute a set of candidate transmission resource blocks.

The above example is described based on the determination of N time-frequency resources included in one candidate transmission resource block based on the same time-frequency resource pattern. In specific implementation, multiple time-frequency resource patterns may be used to determine N included in different candidate transmission resource blocks Time-frequency resources, for example, using two time-frequency resource patterns as an example, the two time-frequency resource patterns can be used separately to determine the candidate transmission resource block according to the above method, and the candidate transmission determined according to the two time-frequency resource patterns The resource blocks constitute a set of candidate transmission resource blocks. When resource selection is performed based on the candidate transmission resource blocks determined by this method, the idle resources in the resource selection window can be fully utilized.

The configuration method of the above-mentioned time-frequency resource pattern may be the same as the foregoing embodiment, for example, it may be configured by a network or may be pre-configured.

The set of candidate transmission resource blocks determined by the above method can obtain a larger range in the time domain and/or frequency domain than the candidate transmission resources determined by the prior art.

S602: The terminal selects M candidate transmission resource blocks from the candidate transmission resource set as the transmission resources of the terminal on the through link, and M is an integer greater than or equal to 1.

In specific implementation, the terminal may randomly select M candidate transmission resource blocks from the set of candidate transmission resource blocks as the transmission resources of the terminal on the direct link; the terminal may also select the candidate transmission resource blocks in the set of candidate transmission resource blocks Receive the signal strength and select M candidate transmission resource blocks from the set of candidate transmission resource blocks as the transmission resources of the terminal on the through link to avoid or reduce interference. For example, according to the received signal strength from small to large, select the top M candidate transmission resource blocks. Among them, the received signal on a transmission resource block is strong The degree may be the average value of the received signal strength on the N time-frequency resources included in the transmission resource block, or may be the maximum signal received strength on the N time-frequency resources.

Optionally, all time-frequency resources (that is, M*N time-frequency resources) in the selected M candidate transmission resource blocks do not overlap in the time domain, for example, the two adjacent transmission resource blocks in the time domain There will be no overlap in the time span.

Further, in S602, if a constraint condition between transmission resource blocks is configured or pre-agreed, when selecting a candidate transmission resource block, a selection may be made according to the constraint condition, so that the selected transmission resource block conforms to the constraint condition. For example, the constraint condition stipulates that the time interval between different transmission resource blocks does not exceed the set duration. For example, the time interval between the first transmission resource block and the second transmission resource block does not exceed X TTIs, X is an integer greater than or equal to 1, and the value of X can be agreed or configured by the system.

Further, in order to reduce or avoid resource conflicts with other terminals, on the basis of the process shown in FIG. 6 above, according to the monitored SA information sent by other terminals, resource conflicts in the set of candidate transmission resource blocks may occur. Candidate transmission resource blocks are excluded.

7 is a schematic diagram of a resource selection process provided by another embodiment of the present invention. As shown in the figure, the process may include the following steps: S701: The terminal determines a set of candidate transmission resource blocks in the resource selection window according to the time-frequency resource pattern . Among them, the set of candidate transmission resource blocks includes at least one candidate transmission resource block, the candidate transmission resource block is a transmission resource used on the through link, and one candidate transmission resource block includes at least N time-frequency resources used for data transmission, The N time-frequency resources are determined according to the time-frequency resource pattern, and N is an integer greater than or equal to 1. For a specific implementation of this step, refer to S601 in FIG. 6, which is not repeated here; S702: The terminal excludes from the set of candidate transmission resource blocks candidate transmission resource blocks where the terminal has resource conflicts with other terminals, In this step, the terminal can listen to SA information sent by other terminals in the perception window, and determine interference time-frequency resources based on the detected SA information. The interference time-frequency resources are all or all of the time-frequency resources associated with the SA information. section. The terminal determines whether the interference time-frequency resource and the reserved time-frequency resource corresponding to the interference time-frequency resource partially or completely overlap with the candidate transmission resource block in the candidate transmission resource block set, and if so, the candidate transmission resource block set, There are candidate transmission resource blocks that partially or completely overlap with the interference time-frequency resource and the reservation time-frequency resource, which are excluded from the set of candidate transmission resource blocks. Among them, the reservation time-frequency resource corresponding to the interference time-frequency resource can be determined according to the location of the interference time-frequency resource and the reservation cycle. For example, if the number of reservation cycles is R, then reservation cycle 1, reservation cycle 2, ..., reservation cycle In R, the time-frequency resource corresponding to the location of the interference time-frequency resource is determined as the reserved time-frequency resource corresponding to the interference time-frequency resource. Among them, the appointment period may be configured by the network or pre-configured.

Further, when determining the interference time-frequency resource based on the monitored SA information, the time-frequency resource associated with the SA information and the received power of the data channel reference signal greater than the received power threshold may be determined as the interference time-frequency resource, and candidates are being selected In the process of eliminating transmission resource blocks, if the ratio of the number of candidate transmission resource blocks after the candidate transmission resource block set is divided by the number of candidate transmission resource blocks before exclusion is lower than the set threshold, the received power threshold can be increased And execute the exclusion process again until the ratio reaches or exceeds the set threshold. The process can be shown in Figure 8: S801: Determine interference time-frequency resources based on SA information sent by other terminals monitored in the perception window. The interference time-frequency resources are related to the SA information and receive data channel reference signals. Time-frequency resources with a power greater than the received power threshold; S802: In the set of candidate transmission resource blocks, the reserved time-frequency resources corresponding to the interference time-frequency resources and the interference time-frequency resources have partially or completely overlapping candidate transmission resource blocks , Excluded from the set of candidate transmission resource blocks; S803: Determine whether the ratio of the number of candidate transmission resource blocks after and before the elimination of the set of candidate transmission resource blocks is lower than the set threshold, if yes, go to S804, otherwise end; S804 : Raise the receiving power threshold, and execute S801 and S802, then go to S803.

Further, if the data transmission time-frequency resource occupied by the perception window in the data sender terminal (that is, the terminal sends data in the perception window), the terminal cannot communicate because the terminal uses half-duplex communication. The data sent by other terminals is monitored on the resource of the resource, so in order to avoid resource conflicts, it is necessary to assume that the other terminal on the sending resource has reserved the next transmission resource in all possible cycles in the manner of system configuration, so the candidate transmission resource In the block set, for the reserved time-frequency resource corresponding to the data transmission time-frequency resource occupied by the terminal itself, there are candidate transmission resource blocks that partially or all overlap, which is excluded from the candidate transmission resource block set.

S703: The terminal selects M candidate transmission resource blocks from the set of excluded candidate transmission resource blocks as the transmission resources of the terminal on the through link, and M is an integer greater than or equal to 1.

The implementation process of this step can be referred to S602 in FIG. 6, the difference is that in this example, the terminal selects transmission resources from the set of excluded candidate transmission resource blocks.

In order to understand the implementation process of the embodiment shown in FIG. 7 more clearly, the above process will be described in detail with reference to FIG. 9 and specific scenarios.

In this scenario, M=1 and N=4. The time-frequency resource patterns of the four time-frequency resources in a transmission resource block adopt the method shown in FIG. 3-1, and the size of the frequency domain of the transmission resource block is L ( L is an integer greater than or equal to 1) consecutive sub-channels. The resource selection process of the terminal is as follows: In S701, all candidate transmission resource blocks in the resource selection window are marked as available. The candidate transmission resource block can be defined as follows: a candidate transmission resource block is represented as R _{x , y} , where x represents the starting position of the frequency domain of the first time-frequency resource in the candidate transmission resource block, and y represents the first in the candidate transmission resource block The TTI starting position of a time-frequency resource. The candidate transmission resource blocks characterized by R _{x and y} are x+j sub-channels in the frequency domain, where j =0,..., L -1, and y+i TTIs in the time domain, where i =0, ..., N -1. The definition of R _{x and y} is based on the time-frequency resource pattern shown in Figure 3-1;

In S702, the candidate transmission resource blocks in the set of candidate transmission resource blocks that conflict with resources of other terminals are excluded, as follows: the terminal performing resource selection measures the SA information sent by other terminals monitored in the perception window to measure the The PSSCH-RSRP (reference signal receiving power) associated with SA information, and the time-frequency resources in which PSSCH-RSRP is higher than the PSSCH-RSRP threshold are determined as interference time-frequency resources.

The terminal performing resource selection obtains the resource reservation period from the SA information, and if it is determined that the candidate transmission resource block R _{x , y} and the time-frequency resource of the next transmission reserved by other terminals (that is, the reservation time-frequency resource corresponding to the above interference time-frequency resource ) Overlap or partial overlap occurs (Figure 9 only shows the case of partial overlap), or the candidate transmission resource block candidate resource block R _{x , y} scheduled rth transmission resource R _{x , y + r * P_tx} When there is overlap or partial overlap with time-frequency resources reserved by other terminals, the corresponding candidate transmission resource block is excluded from the set of candidate transmission resource blocks. Where r=1, 2, 3, ..., R (R represents the maximum number of question transmission periods), and the service transmission period of the terminal where P_tx performs resource selection.

Optionally, in S702, if the terminal performing resource selection is in the perception window and also transmits data itself, due to the effect of half-duplex, it is impossible to listen to the service packets sent by other terminals on the sending sub-frame This type of sub-frame is called a skip sub-frame. In this case, it is necessary to assume that the other terminals on the sub-frame reserve the next resource in all possible cycles in a system configuration manner, where the set of all possible cycles is configured or pre-configured by the network. If the terminal determines that the candidate transmission resource block R _{x , y} overlaps or partially overlaps with the time-frequency resource of the next transmission reserved by the skip subframe, or the r transmission resource reserved by the candidate transmission resource block R _{x , y} R _{x , y + r * P_tx} overlaps or partially overlaps with the time-frequency resource of the next transmission reserved by the skip subframe, and the corresponding candidate transmission resource block is excluded from the set of candidate transmission resource blocks. Where r=1, 2, 3, ..., R, P_tx is the service transmission period of the terminal for resource selection.

Optionally, in S702, if after the execution of the candidate transmission resource block elimination process, the ratio of the number of candidate transmission resource blocks remaining in the candidate transmission resource block set to the number before elimination is lower than the set threshold, then the PSSCH-RSRP The threshold is increased, and the elimination process is re-executed until the remaining resource ratio reaches or exceeds the threshold.

In S703, the terminal performing resource selection selects a resource corresponding to the candidate transmission resource block from the set of candidate transmission resource blocks.

Optionally, in S703, the terminal may perform S-RSSI (where S is an abbreviation of sidelink, Chinese is a direct link, RSSI is an abbreviation of receive signal strength indicator, and Chinese is a received signal strength indicator) measurement and sequencing. , Select the candidate transmission resource block with the lowest S-RSSI measurement value or a subset of the candidate transmission resource blocks that satisfy the condition. If the selected subset is a subset, the candidate transmission resource block can be selected from the subset in a random manner .

Based on the same technical concept, an embodiment of the present invention also provides a resource selection Device. The device may be a terminal or a device in the terminal.

10 is a schematic structural diagram of a resource selection device provided by an embodiment of the present invention. The device may include: a determination module 1002 and a selection module 1002, where: The determining module 1001 is configured to determine a set of candidate transmission resource blocks in the resource selection window according to the time-frequency resource pattern, the set of candidate transmission resource blocks includes at least one candidate transmission resource block, and the candidate transmission resource block is used in the through link For transmission resources on the road, a candidate transmission resource block includes at least N time-frequency resources for data transmission. The N time-frequency resources are determined according to the time-frequency resource pattern, and N is an integer greater than or equal to 1; selection module 1002 It is used to select M candidate transmission resource blocks from the candidate transmission resource set as the transmission resources of the terminal on the through link, where M is an integer greater than or equal to 1.

Optionally, the time domains of at least 2 candidate transmission resource blocks in the set of candidate transmission resource blocks do not overlap.

Optionally, the selection module 1002 is specifically configured to: exclude from the set of candidate transmission resource blocks candidate transmission resource blocks where the terminal has resource conflicts with other terminals; select M candidate transmissions from the set of excluded candidate transmission resource blocks Resource block.

Optionally, the selection module 1002 is specifically configured to determine interference time-frequency resources based on SA information sent by other terminals monitored in the perception window, and the interference time-frequency resources are among the time-frequency resources associated with the SA information. All or part; in the set of candidate transmission resource blocks, there is a candidate transmission resource block that partially or completely overlaps with the interference time-frequency resource and the reserved time-frequency resource corresponding to the interference time-frequency resource, and from the candidate transmission resource block Excluded from the set; where the reservation time-frequency resource is determined according to the location of the interference time-frequency resource and the reservation period.

Optionally, the interference time-frequency resource is the time-frequency resource associated with the SA information, The data channel reference signal received power is greater than the time-frequency resource of the received power threshold; the selection module 1002 is also used to determine whether the ratio of the number of time-frequency resources after and before the candidate transmission resource block set is lower than the set threshold, if it is , The received power threshold is raised, and the step of determining the interference time-frequency resource and the step of eliminating are performed again.

Optionally, the selection module 1002 is further used for: if the sensing window uses time-frequency resources of data transmission occupied by the terminal, then all possible reservations corresponding to the time-frequency resources of data transmission in the set of candidate transmission resource blocks For time-frequency resources, there are candidate transmission resource blocks that overlap partially or completely, and are excluded from the set of candidate transmission resource blocks.

Optionally, the selection module 1002 is specifically configured to: according to the received signal strength on the candidate transmission resource blocks in the set of excluded candidate transmission resource blocks, select M candidate transmission resource blocks according to the order of the received signal strength from small to large .

Optionally, the selection module 1002 is specifically configured to: randomly select M candidate transmission resource blocks from the set of candidate transmission resource blocks; or, according to the received signal strength on the candidate transmission resource blocks in the set of candidate transmission resource blocks, M candidate transmission resource blocks are selected from the set of candidate transmission resource blocks.

Based on the same technical concept, an embodiment of the present invention also provides a communication device. Referring to FIG. 11, it is a schematic structural diagram of a communication device according to an embodiment of the present invention. The communication device may be a terminal. As shown in the figure, the communication device may include a processor 1101, a memory 1102, a transceiver 1103, and a bus interface.

The processor 1101 is responsible for managing the bus architecture and normal processing. The memory 1102 can store data used by the processor 1101 in performing operations. The transceiver 1103 is used to receive and send data under the control of the processor 1101.

The bus architecture may include any number of interconnected buses and bridges. Specifically, one or more processors represented by the processor 1101 and various circuits of the memory represented by the memory 1102 are connected together. The bus architecture can also connect various other circuits such as peripheral devices, voltage regulators and power management circuits, etc., which are well known in the art, and therefore, they will not be further described in this article. The bus interface provides the interface. The processor 1101 is responsible for managing the bus architecture and normal processing. The memory 1102 can store data used by the processor 1101 in performing operations.

The process disclosed in the embodiment of the present invention may be applied to the processor 1101 or implemented by the processor 1101. In the implementation process, each step of the signal processing flow may be completed by instructions in the form of hardware integrated logic circuits or software in the processor 1101. The processor 1101 may be a general-purpose processor, a digital signal processor, a dedicated integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, which can be implemented or executed The disclosed methods, steps, and logical block diagrams in the embodiments of the present invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in conjunction with the embodiments of the present invention may be directly embodied and executed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor. The software module can be located in random memory, flash memory, read-only memory, programmable read-only memory or electrically readable and writable programmable memory, registers and other mature storage media in the art. The storage medium is located in the memory 1102. The processor 1101 reads the information in the memory 1102 and combines with the hardware to complete the steps of the signal processing process.

Specifically, the processor 1101 is used to read the program in the memory 1102 and perform the following process: determine the candidate transmission resource block in the resource selection window according to the time-frequency resource pattern Set, the set of candidate transmission resource blocks includes at least one candidate transmission resource block, the candidate transmission resource block is a transmission resource for use on a direct link, and one candidate transmission resource block includes at least N time-frequency for data transmission Resources, the N time-frequency resources are determined according to the time-frequency resource pattern, and N is an integer greater than or equal to 1; M candidate transmission resource blocks are selected from the set of candidate transmission resources as the transmission resources of the terminal on the through link, M It is an integer greater than or equal to 1. The specific implementation process of the above process can be referred to the description of the foregoing embodiment, and will not be repeated here.

Optionally, the time domains of at least 2 candidate transmission resource blocks in the set of candidate transmission resource blocks do not overlap.

Optionally, the processor 1101 is specifically configured to: exclude from the candidate transmission resource block set candidate transmission resource blocks where the terminal and the other terminal have resource conflicts; select M candidate transmission resources from the excluded candidate transmission resource block set Piece.

Optionally, the processor 1101 is specifically configured to determine interference time-frequency resources based on SA information sent by other terminals monitored in the perception window, and the interference time-frequency resources are all of the time-frequency resources associated with the SA information Or part; in the set of candidate transmission resource blocks, there is a part or all of overlapping candidate transmission resource blocks corresponding to the interference time-frequency resources and the reserved time-frequency resources corresponding to the interference time-frequency resources, from the set of candidate transmission resource blocks Excluded; wherein, the reservation time-frequency resource is determined according to the location of the interference time-frequency resource and the reservation period.

Optionally, the interference time-frequency resource is a time-frequency resource associated with the SA information, and the data channel reference signal received power is greater than the received power threshold time-frequency resource; the processor 1101 is further configured to: determine the set of candidate transmission resource blocks Whether the ratio of the number of time-frequency resources after elimination and before exclusion is lower than the set threshold, and if so, the received power threshold is increased, and the step of determining the interference time-frequency resource and the elimination step are performed again.

Optionally, the processor 1101 is further configured to: if the perceptual window transmits time-frequency resources of data occupied by the terminal, all possible reservation times corresponding to the time-frequency resources of data transmission in the set of candidate transmission resource blocks Frequency resources, there are candidate transmission resource blocks that overlap partially or completely, and are excluded from the set of candidate transmission resource blocks.

Optionally, the processor 1101 is specifically configured to: according to the received signal strength on the candidate transmission resource blocks in the set of excluded candidate transmission resource blocks, select M candidate transmission resource blocks in descending order of received signal strength.

Optionally, the processor 1101 is specifically configured to: randomly select M candidate transmission resource blocks from the set of candidate transmission resource blocks; or, according to the received signal strength on the candidate transmission resource blocks in the set of candidate transmission resource blocks, from M candidate transmission resource blocks are selected from the set of candidate transmission resource blocks.

Based on the same technical concept, an embodiment of the present invention also provides a computer storage medium. The computer-readable storage medium stores computer-executable instructions, which are used to cause the computer to execute the resource selection process described in the foregoing embodiment.

The present invention is described with reference to flowcharts and/or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and/or block in the flowchart and/or block diagram and a combination of the flow and/or block in the flowchart and/or block diagram may be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing device to produce a machine that allows instructions executed by the processor of the computer or other programmable data processing device Means for generating the functions specified in one block or multiple blocks of the flowchart one flow or multiple flows and/or block diagrams.

These computer program instructions can also be stored in a computer readable memory that can guide the computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer readable memory produce a manufactured product including an instruction device The instruction device implements the functions specified in one block or multiple blocks in one flow or multiple flows in the flowchart and/or one block in the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operating steps can be performed on the computer or other programmable device to generate computer-implemented processing, and thus on the computer or other programmable device The instructions executed above provide steps for implementing the functions specified in one flow or flow of the flowchart and/or one block or flow of the block diagram.

Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic progressive concept. Therefore, the scope of the attached patent application is intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and variations of the present invention fall within the scope of the patent application of the present invention and the scope of its equivalent technology, the present invention is also intended to include these modifications and variations.

S701~S703: Steps

Claims (17)

A resource selection method, comprising: a terminal determining a set of candidate transmission resource blocks in a resource selection window according to a time-frequency resource pattern, the set of candidate transmission resource blocks including at least one candidate transmission resource block, and the candidate transmission resource block To be used for transmission resources on the through link, a candidate transmission resource block includes at least N time-frequency resources for data transmission. The N time-frequency resources are determined according to the time-frequency resource pattern, and N is equal to or greater than 1. Integer; the terminal selects M candidate transmission resource blocks from the set of candidate transmission resources as the transmission resources of the terminal on the through link, M is an integer greater than or equal to 1; wherein the length of the resource selection window is based on the maximum delay of the service Determined. The resource selection method according to claim 1, wherein time domains of at least 2 candidate transmission resource blocks in the set of candidate transmission resource blocks do not overlap. The resource selection method according to claim 1 or 2, wherein the terminal selecting M candidate transmission resource blocks from the set of candidate transmission resource blocks includes: the terminal excluding the terminal and other from the set of candidate transmission resource blocks Candidate transmission resource blocks where the terminal has a resource conflict; the terminal selects M candidate transmission resource blocks from the set of excluded candidate transmission resource blocks. The resource selection method according to claim 3, wherein excluding candidate transmission resource blocks in which a resource conflict occurs between the terminal and other terminals from the set of candidate transmission resource blocks includes: according to the information sent by other terminals monitored in the perception window Scheduling and allocating SA information to determine the interference time-frequency resources, which are all or part of the time-frequency resources associated with the SA information; the set of candidate transmission resource blocks, the interference time-frequency resources and the interference For the reserved time-frequency resources corresponding to the time-frequency resources, there are candidate transmission resource blocks that partially or completely overlap, and are excluded from the set of candidate transmission resource blocks; wherein, the reserved time-frequency resources are based on the location of the interference time-frequency resources and the reservation period determine. The resource selection method according to claim 4, wherein the interference time-frequency resource is a time-frequency resource in which the received power of the data channel reference signal is greater than the received power threshold among the time-frequency resources associated with the SA information; the candidate transmission resource In the block set, the reserved time-frequency resource corresponding to the interference time-frequency resource and the interference time-frequency resource has partially or completely overlapping candidate transmission resource blocks. After being excluded from the candidate transmission resource block set, the method further includes: Whether the ratio of the number of time-frequency resources after and before the exclusion of the candidate transmission resource block set is lower than the set threshold, and if so, the received power threshold is raised and the SA sent from other terminals monitored in the perception window is executed again Information to determine the interference time-frequency resources and the set of candidate transmission resource blocks, the reserved time-frequency resources corresponding to the interference time-frequency resources and the interference time-frequency resources, there are some or all overlapping candidate transmission resource blocks, from Steps excluded from the set of candidate transmission resource blocks. The resource selection method according to claim 4, further comprising: if the sensing window uses time-frequency resources for data transmission occupied by the terminal, the set of candidate transmission resource blocks corresponding to the time-frequency resources for data transmission For all possible reservation time-frequency resources, there are candidate transmission resource blocks that overlap partially or completely, and are excluded from the set of candidate transmission resource blocks. The resource selection method according to claim 3, wherein selecting M candidate transmission resource blocks from the set of excluded candidate transmission resource blocks includes: according to the candidate transmission resource blocks in the set of excluded candidate transmission resource blocks For the received signal strength, M candidate transmission resource blocks are selected in order of the received signal strength from small to large. The resource selection method according to claim 1, wherein the terminal selecting M candidate transmission resource blocks from the candidate transmission resource block set includes: the terminal randomly selecting M candidate transmission resources from the candidate transmission resource block set Block; or, the terminal selects M candidate transmission resource blocks from the set of candidate transmission resource blocks according to the received signal strength on the candidate transmission resource block in the set of candidate transmission resource blocks. A communication device, comprising: a processor and a memory; the processor is used for Read the program in the memory and perform the following process: determine the set of candidate transmission resource blocks in the resource selection window according to the time-frequency resource pattern, the set of candidate transmission resource blocks includes at least one candidate transmission resource block, and the candidate transmission resource block To be used for transmission resources on the through link, a candidate transmission resource block includes at least N time-frequency resources for data transmission. The N time-frequency resources are determined according to the time-frequency resource pattern, and N is equal to or greater than 1. Integer; select M candidate transmission resource blocks from the set of candidate transmission resources as the transmission resource of the terminal on the through link, M is an integer greater than or equal to 1; wherein the length of the resource selection window is determined according to the maximum delay of the service . The communication device according to claim 9, wherein time domains of at least 2 candidate transmission resource blocks in the set of candidate transmission resource blocks do not overlap. The communication device according to claim 9 or 10, wherein the processor is specifically configured to: exclude, from the set of candidate transmission resource blocks, candidate transmission resource blocks in which a resource conflict occurs between the terminal and other terminals; from the excluded candidate transmission In the resource block set, M candidate transmission resource blocks are selected. The communication device according to claim 11, wherein the processor is specifically configured to determine the interference time-frequency resource according to the scheduling allocation SA information sent by other terminals monitored in the perception window, and the interference time-frequency resource is the SA All or part of the time-frequency resources associated with the information; in the set of candidate transmission resource blocks, there are candidate transmissions that overlap partially or completely in the reserved time-frequency resources corresponding to the interference time-frequency resources and the interference time-frequency resources Resource blocks are excluded from the set of candidate transmission resource blocks; where the reservation time-frequency resource is determined according to the location of the interference time-frequency resource and the reservation period. The communication device according to claim 12, wherein the interference time-frequency resource is a time-frequency resource in which the received power of the data channel reference signal is greater than the received power threshold among the time-frequency resources associated with the SA information; the processor is also used to : Determine whether the ratio of the number of time-frequency resources of the set of candidate transmission resource blocks after exclusion and before exclusion is lower than the set threshold, if so, increase the received power threshold, and Performing the step of determining the interference time-frequency resource based on the SA information sent by other terminals monitored in the perception window again and the reservation time-frequency corresponding to the interference time-frequency resource and the interference time-frequency resource in the set of candidate transmission resource blocks For resources, there are candidate transmission resource blocks that partially or completely overlap, and a step of excluding from the set of candidate transmission resource blocks. The communication device according to claim 12, wherein the processor is further configured to: if the perceptual window transmits time-frequency resources of data occupied by the terminal, the candidate transmission resource block set and the time-frequency of the data transmission For all possible reserved time-frequency resources corresponding to the resource, there are candidate transmission resource blocks that overlap partially or completely, and are excluded from the set of candidate transmission resource blocks. The communication device according to claim 11, wherein the processor is specifically configured to: according to the received signal strength on the candidate transmission resource blocks in the set of excluded candidate transmission resource blocks, in order of decreasing received signal strength, M candidate transmission resource blocks are selected. The communication device according to claim 9, wherein the processor is specifically configured to: randomly select M candidate transmission resource blocks from the set of candidate transmission resource blocks; or, according to the candidate transmission resources in the set of candidate transmission resource blocks The received signal strength on the block selects M candidate transmission resource blocks from the set of candidate transmission resource blocks. A computer storage medium, characterized in that the computer readable storage medium stores computer executable instructions for causing the computer to execute the resource selection method according to any one of the request items 1 to 8.

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