CN117858153A

CN117858153A - Competition window adjusting method, data transmission method and device for auxiliary link, and computer readable storage medium

Info

Publication number: CN117858153A
Application number: CN202211202484.9A
Authority: CN
Inventors: 陈咪咪; 张萌
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2024-04-09

Abstract

A contention window adjustment method, a data transmission method and apparatus, and a computer readable storage medium for a secondary link, wherein the contention window adjustment method includes: acquiring feedback information received on a first number of HARQ-ACK feedback time units recently, wherein the first number is a positive integer; and adjusting the length of the competition window according to the received feedback information. The scheme disclosed by the invention can optimize the adjustment strategy of the competition window so that the adjustment strategy is more suitable for the SL-U system.

Description

Competition window adjusting method, data transmission method and device for auxiliary link, and computer readable storage medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a contention window adjustment method, a data transmission method and apparatus, and a computer readable storage medium for an auxiliary link.

Background

In an air interface (New Radio in Unlicensed Spectrum, abbreviated as NR-Unlicensed, abbreviated as NR-U) system operating in an Unlicensed band, a contention window (contention window, abbreviated as CWp) adjustment mechanism is introduced for fair coexistence with other system devices such as Wi-Fi (wireless fidelity). Specifically, the contention window is adjusted according to the proportion of ACKnowledgement information (ACK) in the received hybrid automatic repeat request-ACKnowledgement (HARQ-ACK) feedback.

In a secondary link (SL-U) system operating in an Unlicensed band, the adjustment strategy of the contention window needs to be considered as well. However, on the one hand, not all resource pools in the secondary link support HARQ-ACK feedback; on the other hand, even when supporting HARQ-ACK feedback, since there are three communication types of unicast (unicasting), multicast (multicasting) and broadcast (broadcasting) in the secondary link, different communication types have a personalized design for specific implementation of HARQ-ACK feedback, so that the contention window adjustment mechanism adopted in the existing NR-U system can only be marginally suitable for the unicast communication type of the SL-U system.

Thus, there is a need in the art to provide a contention window adjustment strategy that is more applicable to SL-U systems.

Disclosure of Invention

The technical problem solved by the invention is how to provide a contention window adjustment strategy more suitable for SL-U systems.

In order to solve the above technical problems, an embodiment of the present invention provides a contention window adjustment method for an auxiliary link, including: acquiring feedback information received on a first number of HARQ-ACK feedback time units recently, wherein the first number is a positive integer; and adjusting the length of the competition window according to the received feedback information.

Optionally, the adjusting the length of the contention window according to the received feedback information includes: when the number of ACK in the received feedback information is larger than or equal to the second number or the duty ratio of ACK is larger than or equal to the third number, maintaining the length of the contention window unchanged; otherwise, the length of the contention window is increased.

Optionally, the adjusting the length of the contention window according to the received feedback information includes: when the number of NACK in the received feedback information is smaller than the fourth number or the duty ratio of NACK is smaller than the fifth number, maintaining the length of the competition window unchanged; otherwise, the length of the contention window is increased.

Optionally, the feedback information is received from one or more receiving ends, where the one or more receiving ends at least include an opposite end of the secondary link.

Optionally, the method further comprises: and when the LBT in the adjusted contention window is successful, the auxiliary link is used for unicast data transmission.

Optionally, the adjusting the length of the contention window according to the received feedback information includes: when the number of the received feedback information is greater than or equal to a sixth number or the ratio of the number of the received feedback information to the total number of the feedback information to be received is greater than or equal to a seventh number, the length of the contention window is increased, wherein the feedback information is NACK; otherwise, the length of the contention window is maintained unchanged.

Optionally, the method further comprises: and when the LBT in the adjusted contention window is successful, the auxiliary link is used for carrying out the multicast data transmission of the type 1.

Optionally, the adjusting the length of the contention window according to the received feedback information includes: when at least one group of HARQ-ACK feedback in the received feedback information is ACK, maintaining the length of the contention window unchanged, wherein one group of HARQ-ACK feedback is HARQ-ACK feedback aiming at the same auxiliary link transmission; otherwise, the length of the contention window is increased.

Optionally, the method further comprises: and when the LBT in the adjusted contention window is successful, the auxiliary link is used for carrying out the multicast data transmission of the type 2.

Optionally, the feedback information is received from one or more groups of receiving ends, where the one or more groups of receiving ends at least include opposite ends of the auxiliary link.

Optionally, the opposite ends of the same auxiliary link belong to the same group of receiving ends, or the opposite ends of one or more auxiliary links in the same beam direction belong to the same group of receiving ends.

Optionally, the method further comprises: and when no feedback information is received on the last first number of HARQ-ACK feedback time units, determining the length of the contention window as a preset default value or keeping the length unchanged.

Optionally, the HARQ-ACK feedback time unit includes a slot in which the PSFCH is located.

In order to solve the above technical problem, an embodiment of the present invention further provides a contention window adjusting apparatus for an auxiliary link, including: the acquisition module is used for acquiring feedback information received on the latest first number of HARQ-ACK feedback time units, wherein the first number is a positive integer; and the adjusting module is used for adjusting the length of the competition window according to the received feedback information.

In order to solve the above technical problem, the embodiment of the present invention further provides a data transmission method for an auxiliary link, including: receiving data using the secondary link; the data transmission on the auxiliary link is performed when the LBT is successful in the adjusted contention window, and the length of the contention window is adjusted according to the feedback information sent to the opposite end of the auxiliary link on the latest first number of HARQ-ACK feedback time units.

In order to solve the above technical problem, an embodiment of the present invention further provides a data transmission device for an auxiliary link, including: a receiving module, configured to receive data using the secondary link; the data transmission on the auxiliary link is performed when the LBT is successful in the adjusted contention window, and the length of the contention window is adjusted according to the feedback information sent to the opposite end of the auxiliary link on the latest first number of HARQ-ACK feedback time units.

To solve the above technical problem, embodiments of the present invention further provide a computer readable storage medium, where the computer readable storage medium is a non-volatile storage medium or a non-transitory storage medium, and a computer program is stored thereon, and when the computer program is executed by a processor, the steps of the above method are performed.

In order to solve the above technical problem, an embodiment of the present invention further provides a contention window adjusting apparatus for an auxiliary link, including a memory and a processor, where the memory stores a computer program that can be run on the processor, and the processor executes the steps of the method when running the computer program.

In order to solve the above technical problem, an embodiment of the present invention further provides a data transmission device for an auxiliary link, including a memory and a processor, where the memory stores a computer program that can be run on the processor, and the processor executes the steps of the method when running the computer program.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:

on the transmitting end side, the embodiment of the invention provides a contention window adjusting method for an auxiliary link, which comprises the following steps: acquiring feedback information received on a first number of HARQ-ACK feedback time units recently, wherein the first number is a positive integer; and adjusting the length of the competition window according to the received feedback information.

By adopting the embodiment, the adjustment strategy of the competition window can be enhanced according to the characteristics of the SL-U system, so that the method is suitable for the SL-U system. Specifically, compared to the existing NR-U system, the present embodiment adjusts the contention window only according to the HARQ-ACK feedback for the last data transmission of the transmitting end, and uses the characteristic that the HARQ-ACK feedback in the SL-U system is semi-static scheduling in the time domain to adjust the contention window according to the feedback information received in the last first number of HARQ-ACK feedback time units. Since there may be HARQ-ACK feedback for multiple secondary link transmissions on a single HARQ-ACK feedback time unit in the SL-U system, it is expected that the transmitting end adopting this embodiment can fully understand the current communication environment and more reasonably adjust the contention window by integrating the reception conditions of multiple opposite ends to better achieve the anti-interference effect.

Further, the feedback information received on the most recent first number of HARQ-ACK feedback time units may be the same data sent by the transmitting end or different data, may be from one or a group of receiving ends or from multiple or multiple groups of receiving ends, and may be all receiving ends in a specific beam direction in a high frequency communication scenario.

On the receiving end side, the embodiment of the invention provides a data transmission method for an auxiliary link, which comprises the following steps: receiving data using the secondary link; the data transmission on the auxiliary link is performed when the LBT is successful in the adjusted contention window, and the length of the contention window is adjusted according to the feedback information sent to the opposite end of the auxiliary link on the latest first number of HARQ-ACK feedback time units.

With the present embodiment, the transmitting end can successfully receive the data transmission performed after LBT based on the adjusted contention window with a greater probability. Thereby, the SL communication quality of the transmitting end and the receiving end is significantly improved.

Drawings

Fig. 1 is a flowchart of a contention window adjustment method for a secondary link according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of an exemplary application scenario according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a contention window adjusting apparatus for a secondary link according to a second embodiment of the present invention;

fig. 4 is a flowchart of a data transmission method for a secondary link according to a third embodiment of the present invention;

fig. 5 is a schematic structural diagram of a data transmission apparatus for an auxiliary link according to a fourth embodiment of the present invention.

Detailed Description

As described in the background, the manner of adjusting the contention window CWp according to the proportion of ACK in the existing NR-U system is no longer applicable to the SL-U system. Where p is an abbreviation for channel access priority (Channel Access Priority), different channel access priorities correspond to different contention window adjustment ranges.

Specifically, for multicast type 1 in the SL-U system, the receiving end feeds back feedback information of a Non-ACKnowledgement (NACK) only when receiving is unsuccessful, and all receiving ends feed back on the same time-frequency resource. At this time, the sending end cannot receive the feedback information of the ACK, and thus cannot adjust the contention window according to the proportion of the received ACK.

For multicast type 2 in the SL-U system, different receiving ends feed back ACK or NACK respectively on different time-frequency resources. That is, for a certain secondary link transmission, such as a physical layer side link shared channel (Physical Sidelink Shared Channel, abbreviated as PSSCH transmission), the transmitting end may receive both NACK and ACK, so that the scheme of adjusting the contention window according to the ACK ratio in the HARQ-ACK feedback corresponding to the last secondary link transmission burst (burst) in the prior art cannot be directly used.

On the transmitting end side, the implementation method can enhance the adjustment strategy of the contention window according to the characteristics of the SL-U system, so that the method is suitable for the SL-U system. Specifically, compared to the existing NR-U system, the present embodiment adjusts the contention window only according to the HARQ-ACK feedback for the last data transmission of the transmitting end, and uses the characteristic that the HARQ-ACK feedback in the SL-U system is semi-static scheduling in the time domain to adjust the contention window according to the feedback information received in the last first number of HARQ-ACK feedback time units. Further, the feedback information received on the most recent first number of HARQ-ACK feedback time units may be the same data sent by the sending end or different data, and may be from one receiving end or a group of receiving ends, or may be from multiple receiving ends or multiple groups of receiving ends. Since there may be HARQ-ACK feedback for multiple secondary link transmissions on a single HARQ-ACK feedback time unit in the SL-U system, it is expected that the transmitting end adopting this embodiment can fully understand the current communication environment and more reasonably adjust the contention window by integrating the reception conditions of multiple opposite ends to better achieve the anti-interference effect.

In this embodiment, "LBT" is abbreviated as listen before talk (Listen Before Talk), and on an unlicensed band, a device needs to perform an LBT mechanism to preempt a channel, and can occupy the channel if the listening discovery channel is idle. LBT mechanisms in SL-U systems may refer to LBT mechanisms in NR-U systems, which support LBT types (types) including type1 and type 2A/B/C.

Taking type1 as an example, if the channel is always in idle state during the initial idle channel detection (Initial Clear Channel Assessment, abbreviated as ICCA), data transmission can be directly performed. And if the channel is detected to be busy, entering a back-off process. The back-off flow is as follows: the node needs to randomly generate a value N in the set in the interval 0-CWp as the timer value, which is the actual backoff period. If the channel is detected to be idle, the timer value is reduced by 1, and the LBT is continued. Until the timer expires, the node may transmit data.

In this embodiment, the communication type (cast type) of the terminal on the secondary link includes unicast, multicast, and broadcast. In unicast communication, the auxiliary link connects a transmitting UE (User Equipment) and a receiving UE, and can support a HARQ-ACK feedback (feedback) mechanism. The transmitting UE may also be referred to as a transmitting end, and the receiving UE may also be referred to as a receiving end.

The multicast communication types further include two multicast communication types, type1 and type 2. When the type1 multicast communication (group type 1) is performed, the auxiliary link connects one sending UE and a plurality of receiving UEs, so that an HARQ-ACK feedback mechanism can be supported, the receiving end feeds back NACK only when the receiving is unsuccessful, and all receiving UEs feed back on the same time-frequency resource.

When in type2 multicast communication (group type 2), the auxiliary link connects one sending UE and a plurality of receiving UEs, and can support an HARQ-ACK feedback mechanism, and different receiving ends respectively feed back ACK/NACK on different time-frequency resources. That is, for a certain PSSCH transmission, the transmitting end may receive both NACK and ACK.

In this embodiment, the "time unit" may be the communication granularity of the terminal device and the network device in the time domain. For example, the time units may be slots, mini slots (i.e., units of time length shorter than the slots), subframes, symbols, frames, etc. The same time unit refers to the same time unit, for example, slot 0 or slot 1.

The following will specifically describe an example of a time slot as a time unit.

The "HARQ-ACK feedback time unit" in this embodiment may be, for example, a time slot in which a physical secondary link feedback channel (Physical Sidelink Feedback Channel, abbreviated as PSFCH) is located, and is at least used to carry secondary link PSFCH resources. In the secondary link, PSFCH slots occur periodically with a period of 1,2,4 (slots). In the frequency domain, PSFCH transmissions of multiple terminals or one terminal may be frequency division multiplexed, and one PSFCH transmission occupies only one RB (physical resource block, physical Resource Block, or simply PRB). In one possible example, the time slot in which the PSFCH is located may also carry a PSCCH or PSSCH.

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

Fig. 1 is a flowchart of a contention window adjustment method for a secondary link according to a first embodiment of the present invention.

The embodiment can be applied to a secondary link data transmission scene supporting HARQ-ACK feedback, and is executed by a transmitting end of a secondary link. By executing the embodiment, the sending end of the auxiliary link can adjust the length of the contention window by a policy more suitable for the characteristics of the SL-U system. This is expected to improve the success rate of subsequent data transmission, etc.

In a specific implementation, the contention window adjustment method for the secondary link provided in the following steps S101 to S102 may be executed by a chip with a contention window adjustment function in the ue, or may be executed by a baseband chip in the ue. Further, the role of the user equipment in the secondary link communication may be a transmitting end.

Specifically, referring to fig. 1, the contention window adjustment method for the secondary link according to the present embodiment may include the following steps:

step S101, obtaining feedback information received on a first number (k) of HARQ-ACK feedback time units recently, wherein the first number k is a positive integer;

Step S102, the length of the competition window is adjusted according to the received feedback information.

For example, it may be determined whether to adjust the contention window based on feedback information received on the time slots in which the last k PSFCHs are located.

In a typical application scenario, with reference to fig. 2, assuming that k=2, it can be determined whether to adjust the contention window according to feedback information received in the time slots where the last 2 PSFCHs are located, i.e. the time slots n+3 and n+7. For ease of description, PSFCH at time slot n+3 is denoted as PSFCH1, and PSFCH at time slot n+7 is denoted as PSFCH2. Taking PSFCH2 as an example, on PSFCH2, feedback information for PSSCH (denoted as PSSCH 1) transmitted by the transmitting end in time slot n+2, feedback information for PSSCH (denoted as PSSCH 2) transmitted by the transmitting end in time slot n+3, feedback information for PSSCH (denoted as PSSCH 3) transmitted by the transmitting end in time slot n+4, and feedback information for PSSCH (denoted as PSSCH 4) transmitted by the transmitting end in time slot n+5 may be transmitted.

In one implementation, step S102 may include the steps of: when the number of ACK in the received feedback information is larger than or equal to the second number, maintaining the length of the contention window unchanged; otherwise, the length of the contention window is increased.

Specifically, during unicast communication, a transmitting end and a receiving end establish auxiliary link connection, and the receiving end can be called an opposite end of the auxiliary link.

Further, feedback information received on the time slots where the last k PSFCHs are located may all come from the opposite end of the secondary link. The opposite ends of the transmitting end and the secondary link may perform one or more PSSCH transmissions, so the amount of feedback information may be one or more, respectively for the one or more PSSCH transmissions. For each feedback information, the specific content of the feedback information may be NACK or ACK, so as to indicate whether the opposite end of the secondary link successfully receives the corresponding PSSCH transmission.

Further, the transmitting end may count the number of ACKs in all feedback information sent by the opposite end of the secondary link, where the last k PSFCHs are received in the slot, so as to determine whether to adjust the contention window. For example, if at least m1 pieces of feedback information are ACKs, the length of the contention window is not adjusted; otherwise, the length of the contention window is adjusted to a larger value. Wherein m1 is the second number.

Therefore, the length of the contention window is accurately adjusted according to the proportion of feedback ACK in HARA-ACK feedback of k PSFCH (packet data channel) on the time slot where the opposite end of the auxiliary link is located.

In a variation, the transmitting end may simultaneously establish a one-to-one auxiliary link with the plurality of receiving ends respectively, so as to simultaneously perform unicast communication with the plurality of receiving ends respectively.

Further, the feedback information received on the time slots where the last k PSFCHs are located may be from one or more receiving ends, including at least the opposite end of the secondary link. The number of received feedback information may be one or more, and corresponds to PSSCH transmissions received by one or more receiving terminals before the last k slots in which the PSFCHs are located, respectively. For each feedback information, the specific content of the feedback information may be NACK or ACK, so as to indicate whether the receiving end successfully receives the corresponding PSSCH transmission.

Further, the transmitting end may count the number of ACKs in all feedback information received on the time slots where the last k PSFCHs are located. If at least m1 pieces of feedback information are ACK, not adjusting the length of the contention window; otherwise, the length of the contention window is adjusted to a larger value.

In this variation, besides obtaining feedback information fed back by the opposite end of the auxiliary link on the time slots where the k last PSFCHs are located, the adjustment strategy of the contention window is comprehensively determined by combining feedback information fed back by other receiving ends which perform unicast communication with the transmitting end on the time slots where the k last PSFCHs are located. Thus, it is advantageous to improve the interference phenomenon between a plurality of receiving terminals simultaneously performing unicast communication with the same transmitting terminal.

In another variation, in the unicast communication scenario, step S102 may include the steps of: when the duty ratio of the ACK in the received feedback information is larger than or equal to a third quantity (denoted as x 1), maintaining the length of the contention window unchanged; otherwise, the length of the contention window is increased.

For example, the transmitting end may count the duty ratio of ACK in all feedback information received on the time slots where the last k PSFCHs are located. x1 may be a number between 0 and 1, or may be identified in percent form. For example, if the duty cycle of the ACK reaches x1%, the length of the contention window is not adjusted; otherwise, the length of the contention window is adjusted to a larger value.

In yet another variation, in the unicast communication scenario, step S102 may include the steps of: when the number of NACK in the received feedback information is smaller than the fourth number or the duty ratio of NACK is smaller than the fifth number, maintaining the length of the competition window unchanged; otherwise, the length of the contention window is increased.

That is, in this variation, the sender counts the number of NACKs or the duty ratio in all the received feedback information, instead of the number or the duty ratio of ACKs in the above embodiment.

Further, the sum of the second number and the fourth number is equal to the total number of feedback information received over the last k slots in which the PSFCHs are located.

Further, the sum of the third number and the fifth number is equal to 1, i.e. the fifth number is 1-x1.1-x1 may be a number between 0 and 1, or may be identified in percent form. For example, if the NACK's duty ratio in all received feedback information reaches 1-x1%, the length of the contention window is not adjusted; otherwise, the length of the contention window is adjusted to a larger value.

In one implementation, in the unicast communication scenario, after step S102, the method of this embodiment may further include the steps of: and when the LBT in the adjusted contention window is successful, the auxiliary link is used for unicast data transmission.

Specifically, the adjusted contention window may be the contention window with the increased length determined according to the number or the duty ratio of the ACKs (or NACKs) in the above embodiment, or may be the contention window with the length determined to be unchanged in the above embodiment.

In one implementation, in the multicast communication scenario of type 1, step S102 may include the steps of: when the number of the received feedback information is greater than or equal to a sixth number, increasing the length of the contention window, wherein the feedback information is NACK; otherwise, the length of the contention window is maintained unchanged.

Specifically, during the multicast communication of the type 1, after the sender historically transmits the PSSCH, each PSSCH may have a corresponding PSFCH time-frequency resource for the receiver to feedback NACK or not. Correspondingly, the transmitting end can count the number of NACKs received on the time slots where the last k PSFCHs are located. If at least m2 NACKs are received, the length of the competition window is increased; otherwise, the length of the contention window is not adjusted. Wherein m2 is the sixth number.

Alternatively, step S102 may include: increasing the length of the contention window when the ratio of the number of received NACKs to the total number of feedback information to be received is greater than or equal to a seventh number (denoted as x 2); otherwise, the length of the contention window is maintained unchanged. The total number of feedback information to be received is the number of PSFCH time-frequency resources falling on the last k HARQ-ACK feedback time units.

Further, the sixth number may be less than or equal to the total number of feedback information to be received. For example, the sixth number may be equal to the total number of feedback information to be received. That is, when NACK is received on all slots where the last k PSFCHs are located, the transmitting end increases the length of the contention window; otherwise, the contention window is not adjusted.

Further, in this embodiment, the feedback information received on the time slots in which the last k PSFCHs are located may be from one or more sets of receiving ends, where the one or more sets of receiving ends include at least opposite ends of the secondary link. Wherein, a group of receiving ends may correspond to one auxiliary link, that is, the opposite ends of the same auxiliary link may belong to the same group of receiving ends. Or when the transmitting end works in a high frequency band (such as FR 2), the opposite ends of one or more auxiliary links in the same beam direction belong to the same group of receiving ends.

In other words, in this embodiment, the transmitting end may only count the number of NACKs transmitted by a group of receiving ends serving as the opposite ends of the secondary link in the feedback information received on the time slots where the last k PSFCHs are located. Therefore, the length of the contention window can be more accurately adjusted according to the communication condition on the auxiliary link.

Or the transmitting end can count the number of NACK transmitted by all groups of receiving ends in the feedback information received on the time slots where the k last PSFCHs are located. Thus, the length of the contention window can be comprehensively adjusted from the interference point of view.

In one implementation, in the multicast communication scenario of type 1, the method in this embodiment may further include the steps of: and when the LBT in the adjusted contention window is successful, the auxiliary link is used for carrying out the multicast data transmission of the type 1.

Specifically, the adjusted contention window may be the contention window with the increased length determined according to the number or the duty ratio of the NACK in the above embodiment, or may be the contention window with the length determined to be unchanged in the above embodiment.

In one implementation, in a multicast communication scenario of type 2, step S102 may include the steps of: when at least one group of HARQ-ACK feedback in the received feedback information is ACK, maintaining the length of the contention window unchanged; otherwise, the length of the contention window is increased.

Specifically, a set of HARQ-ACK feedback is HARQ-ACK feedback for the same secondary link transmission. That is, a set of PSFCH time-frequency resources corresponds to HARQ-ACK feedback of one PSSCH.

Further, in this implementation, for all groups of PSFCH time-frequency resources over the last k slots in which the PSFCHs are located, a NACK in each group indicates that the contention window needs to be adjusted.

In other words, in this embodiment, the transmitting end may only count feedback information sent by the group of receiving ends serving as the opposite ends of the secondary link on the time slots where the k last PSFCHs are located. Therefore, the length of the contention window can be more accurately adjusted according to the communication condition on the auxiliary link.

Or the transmitting end can count feedback information transmitted by all groups of receiving ends on the time slots where the last k PSFCHs are located. Thus, the length of the contention window can be comprehensively adjusted from the interference point of view.

In one implementation, in the multicast communication scenario of type 2, the method in this embodiment may further include the steps of: and when the LBT in the adjusted contention window is successful, the auxiliary link is used for carrying out the multicast data transmission of the type 2.

Specifically, the adjusted contention window may be the contention window adjusted according to whether there is at least one group of HARQ-ACK feedback for full ACK in the above embodiment, or may be the contention window with the length determined to be unchanged in the above embodiment.

In one implementation, the method of this embodiment may further include the steps of: and when no feedback information is received on the last first number of HARQ-ACK feedback time units, determining the length of the contention window as a preset default value or keeping the length unchanged.

Specifically, the preset default value may be a preset fixed value.

In one implementation, the adjusting the length of the contention window in step S102 may specifically include the steps of: increasing the value of the length is the next higher available value. Wherein the available value is selected from a set of available values, which is configured or preconfigured.

Further, increasing the value of the length to the next higher available value may specifically comprise the steps of: and respectively increasing the value of the contention window length corresponding to all priority levels to be the next higher available value.

Therefore, on the transmitting end side, the implementation method can strengthen the adjustment strategy of the contention window aiming at the characteristics of the SL-U system, so that the method is suitable for the SL-U system. Specifically, compared to the existing NR-U system, the present embodiment adjusts the contention window only according to the HARQ-ACK feedback for the last data transmission of the transmitting end, and uses the characteristic that the HARQ-ACK feedback in the SL-U system is semi-static scheduling in the time domain to adjust the contention window according to the feedback information received in the last first number of HARQ-ACK feedback time units.

Further, the feedback information received on the most recent first number of HARQ-ACK feedback time units may be the same data sent by the sending end or different data, and may be from one receiving end or a group of receiving ends, or may be from multiple receiving ends or multiple groups of receiving ends. Since there may be HARQ-ACK feedback for multiple secondary link transmissions on a single HARQ-ACK feedback time unit in the SL-U system, it is expected that the transmitting end adopting this embodiment can fully understand the current communication environment and more reasonably adjust the contention window by integrating the reception conditions of multiple opposite ends to better achieve the anti-interference effect.

Fig. 3 is a schematic structural diagram of a contention window adjusting apparatus 2 for a secondary link according to a second embodiment of the present invention. Those skilled in the art will appreciate that the contention window adjusting apparatus 2 for a secondary link according to the present embodiment may be used to implement the method technical solutions described in the embodiments described in fig. 1 and fig. 2.

Specifically, referring to fig. 3, the contention window adjusting apparatus 2 for the secondary link according to the present embodiment may include: an obtaining module 21, configured to obtain feedback information received on a first number of HARQ-ACK feedback time units, where the first number is a positive integer; and the adjusting module 22 is configured to adjust the length of the contention window according to the received feedback information.

For more details of the working principle and the working manner of the contention window adjusting apparatus 2 for the secondary link, reference may be made to the related descriptions in fig. 1 and fig. 2, which are not repeated herein.

In a specific implementation, the contention window adjusting apparatus for the secondary link may correspond to a Chip with a contention window adjusting function in the ue, or a Chip with a data processing function, such as a System-On-a-Chip (SOC), a baseband Chip, etc.; or corresponds to a chip module comprising a chip with a contention window adjusting function in the user equipment; or corresponds to a chip module having a data processing function chip or corresponds to a user equipment.

Fig. 4 is a flowchart of a data transmission method for a secondary link according to a third embodiment of the present invention.

The embodiment can be applied to a data transmission scene of a secondary link supporting HARQ-ACK feedback, and is executed by a receiving end of the secondary link. By executing the schemes of the embodiments shown in fig. 1 and fig. 2, the transmitting end of the secondary link can adjust the length of the contention window according to a policy more suitable for the characteristics of the SL-U system, perform LBT in the adjusted contention window, and transmit data to the receiving end of the secondary link when the LBT is successful. Correspondingly, the length of the contention window affecting the transmission time of the data of the auxiliary link by the transmitting end is adjusted according to the earlier-stage communication condition of the auxiliary link, so that the channel state of the transmitting end when actually transmitting the data of the auxiliary link is more beneficial to the accurate receiving of the receiving end. Therefore, the receiving end executing the scheme of the embodiment has a higher probability of successfully receiving the data transmitted by the sending end on the auxiliary link.

In a specific implementation, the data transmission method for the secondary link provided in step S301 below may be performed by a chip with a data transmission function in the user equipment, or may be performed by a baseband chip in the user equipment. Further, the role of the user equipment in the secondary link communication may be a receiving end.

Specifically, referring to fig. 4, the data transmission method for the secondary link according to the present embodiment may include: step S301, receiving data using the secondary link.

The data transmission on the auxiliary link is performed when the LBT is successful in the adjusted contention window, and the length of the contention window is adjusted according to the feedback information sent to the opposite end of the auxiliary link on the latest first number of HARQ-ACK feedback time units.

It will be appreciated by those skilled in the art that the step S301 may be regarded as an execution step corresponding to the steps S101 to S102 described in the embodiment shown in fig. 1, and the two steps complement each other in specific implementation principles and logic. Thus, the explanation of the nouns in this embodiment may refer to the related description of the embodiment shown in fig. 1, which is not repeated here.

For example, after performing step S102, the transmitting end may perform LBT within the adjusted contention window. And when the LBT is successful, the sending end transmits data to the receiving end on the auxiliary link according to the corresponding communication type. Correspondingly, the receiving end performs step S301 to receive the data transmitted by the transmitting end through the secondary link.

By the above, with the present embodiment, the transmitting end can successfully receive the data transmission performed after LBT based on the adjusted contention window with a higher probability. Thereby, the SL communication quality of the transmitting end and the receiving end is significantly improved.

Fig. 5 is a schematic structural diagram of a data transmission apparatus 4 for an auxiliary link according to a fourth embodiment of the present invention. It will be appreciated by those skilled in the art that the data transmission device 4 for the secondary link according to the present embodiment may be used to implement the method technical solution described in the embodiment of fig. 4.

Specifically, referring to fig. 5, the data transmission apparatus 4 for the secondary link according to the present embodiment may include: a receiving module 41 for receiving data using the secondary link; the data transmission on the auxiliary link is performed when the LBT is successful in the adjusted contention window, and the length of the contention window is adjusted according to the feedback information sent to the opposite end of the auxiliary link on the latest first number of HARQ-ACK feedback time units.

For more details of the working principle and the working manner of the data transmission device 4 for the auxiliary link, reference may be made to the related description in fig. 4, which is not repeated here.

In a specific implementation, the above-mentioned data transmission device for the auxiliary link may correspond to a Chip with a data transmission function in the ue, or a Chip with a data processing function, such as a System-On-a-Chip (SOC), a baseband Chip, etc.; or corresponds to a chip module comprising a chip with a data transmission function in the user equipment; or corresponds to a chip module having a data processing function chip or corresponds to a user equipment.

In a specific implementation, regarding each apparatus and each module/unit included in each product described in the above embodiments, it may be a software module/unit, or a hardware module/unit, or may be a software module/unit partially, or a hardware module/unit partially.

For example, for each device or product applied to or integrated on a chip, each module/unit included in the device or product may be implemented in hardware such as a circuit, or at least part of the modules/units may be implemented in software program, where the software program runs on a processor integrated inside the chip, and the rest (if any) of the modules/units may be implemented in hardware such as a circuit; for each device and product applied to or integrated in the chip module, each module/unit contained in the device and product can be realized in a hardware manner such as a circuit, different modules/units can be located in the same component (such as a chip, a circuit module and the like) or different components of the chip module, or at least part of the modules/units can be realized in a software program, the software program runs on a processor integrated in the chip module, and the rest (if any) of the modules/units can be realized in a hardware manner such as a circuit; for each device, product, or application to or integrated with the terminal, each module/unit included in the device, product, or application may be implemented by using hardware such as a circuit, different modules/units may be located in the same component (for example, a chip, a circuit module, or the like) or different components in the terminal, or at least part of the modules/units may be implemented by using a software program, where the software program runs on a processor integrated inside the terminal, and the remaining (if any) part of the modules/units may be implemented by using hardware such as a circuit.

The embodiment of the present invention further provides a computer readable storage medium, where the computer readable storage medium is a non-volatile storage medium or a non-transitory storage medium, and the computer program is stored thereon, and when executed by a processor, performs the steps of the contention window adjustment method for the secondary link provided in the embodiment shown in fig. 1 and fig. 2, or performs the steps of the data transmission method for the secondary link provided in the embodiment shown in fig. 4. Preferably, the storage medium may include a computer-readable storage medium such as a non-volatile (non-volatile) memory or a non-transitory (non-transitory) memory. The storage medium may include ROM, RAM, magnetic or optical disks, and the like.

The embodiment of the invention also provides another contention window adjusting device for the auxiliary link, which comprises a memory and a processor, wherein the memory stores a computer program which can be run on the processor, and the processor executes the steps of the contention window adjusting method for the auxiliary link provided by the corresponding embodiment of the above-mentioned fig. 1 and 2 when running the computer program. The contention window adjusting apparatus for the secondary link may be, for example, a user equipment, such as a transmitting end of the secondary link. Alternatively, the contention window adjusting apparatus for the secondary link may be a dedicated module integrated in the ue or external to the ue.

The embodiment of the invention also provides another data transmission device for the auxiliary link, which comprises a memory and a processor, wherein the memory stores a computer program which can be run on the processor, and the processor executes the steps of the data transmission method for the auxiliary link provided by the corresponding embodiment of the above-mentioned fig. 4 when running the computer program. The data transmission device for the secondary link may be, for example, a user equipment, such as a receiving end of the secondary link. Alternatively, the data transmission device for the secondary link may be a dedicated module integrated in the ue or external to the ue.

Those of ordinary skill in the art will appreciate that all or a portion of the steps in the various methods of the above embodiments may be implemented by a program that instructs related hardware, the program may be stored on a computer readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, etc.

The technical scheme of the invention can be applied to 5G (5 generation) communication systems, 4G and 3G communication systems, and various communication systems of subsequent evolution, such as 6G and 7G.

The technical scheme of the invention is also applicable to different network architectures, including but not limited to a relay network architecture, a double link architecture and a Vehicle-to-evaluation (communication from a Vehicle to any object) architecture.

The 5G CN described in the embodiments of the present application may also be referred to as a new core network (new core), or a 5G NewCore, or a next generation core network (next generation core, NGC), or the like. The 5G-CN is arranged independent of existing core networks, e.g. evolved packet core (evolved packet core, EPC).

A Base Station (BS), which may also be referred to as a base station device, in the embodiments of the present application is a device deployed in a radio access network to provide a wireless communication function. The apparatus for providing a base station function in the 2G network includes a base Radio transceiver station (base transceiver station, BTS) and a base station controller (base station controller, BSC), the apparatus for providing a base station function in the 3G network includes a node B (NodeB) and a Radio network controller (Radio network controller, RNC), the apparatus for providing a base station function in the 4G network includes an evolved node B (eNB), the apparatus for providing a base station function in the wireless local area network (wireless local area networks, WLAN) is an Access Point (AP), the apparatus for providing a base station function in the 5G New Radio (NR) includes a continuously evolved node B (gNB), and the apparatus for providing a base station function in the future New communication system, and the like.

A terminal in an embodiment of the present application may refer to various forms of User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a Mobile Station (MS), a remote station, a remote terminal, a mobile device, a user terminal, a terminal device (terminal equipment), a wireless communication device, a user agent, or a user equipment. The terminal device may also be a cellular telephone, a cordless telephone, a session initiation protocol (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital assistant (Personal Digital Assistant, PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved public land mobile network (Public Land Mobile Network, PLMN), etc., as the embodiments of the application are not limited in this respect.

The embodiment of the application defines a unidirectional communication link from an access network to a terminal as a downlink, wherein data transmitted on the downlink is downlink data, and the transmission direction of the downlink data is called as a downlink direction; and the unidirectional communication link from the terminal to the access network is an uplink, the data transmitted on the uplink is uplink data, and the transmission direction of the uplink data is called as uplink direction.

It should be understood that the term "and/or" is merely an association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In this context, the character "/" indicates that the front and rear associated objects are an "or" relationship.

The term "plurality" as used in the embodiments herein refers to two or more.

The first, second, etc. descriptions in the embodiments of the present application are only used for illustrating and distinguishing the description objects, and no order division is used, nor does it indicate that the number of the devices in the embodiments of the present application is particularly limited, and no limitation on the embodiments of the present application should be construed.

The "connection" in the embodiments of the present application refers to various connection manners such as direct connection or indirect connection, so as to implement communication between devices, which is not limited in any way in the embodiments of the present application. The "network" and the "system" appearing in the embodiments of the present application express the same concept, and the communication system is a communication network.

It should be appreciated that in the embodiments of the present application, the processor may be a central processing unit (central processing unit, abbreviated as CPU), and the processor may also be other general purpose processors, digital signal processors (digital signal processor, abbreviated as DSP), application specific integrated circuits (application specific integrated circuit, ASIC), field programmable gate arrays (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It should also be appreciated that the memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. By way of example but not limitation, many forms of random access memory (random access memory, RAM) are available, such as Static RAM (SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced Synchronous Dynamic Random Access Memory (ESDRAM), synchronous Link DRAM (SLDRAM), and direct memory bus RAM (DR RAM).

The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the processes or functions described in accordance with the embodiments of the present application are all or partially produced. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wired (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more sets of available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. The semiconductor medium may be a solid state disk.

It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.

In the several embodiments provided in the present application, it should be understood that the disclosed method, apparatus, and system may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may be physically included separately, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.

The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims

1. A contention window adjustment method for a secondary link, comprising:

acquiring feedback information received on a first number of HARQ-ACK feedback time units recently, wherein the first number is a positive integer;

and adjusting the length of the competition window according to the received feedback information.

2. The method of claim 1, wherein said adjusting the length of the contention window according to the received feedback information comprises:

when the number of ACK in the received feedback information is larger than or equal to the second number or the duty ratio of ACK is larger than or equal to the third number, maintaining the length of the contention window unchanged;

otherwise, the length of the contention window is increased.

3. The method of claim 1, wherein said adjusting the length of the contention window according to the received feedback information comprises:

when the number of NACK in the received feedback information is smaller than the fourth number or the duty ratio of NACK is smaller than the fifth number, maintaining the length of the competition window unchanged;

otherwise, the length of the contention window is increased.

4. A method according to claim 2 or 3, wherein the feedback information is received from one or more receiving ends, the one or more receiving ends comprising at least the opposite end of the secondary link.

5. A method according to claim 2 or 3, further comprising:

and when the LBT in the adjusted contention window is successful, the auxiliary link is used for unicast data transmission.

6. The method of claim 1, wherein said adjusting the length of the contention window according to the received feedback information comprises:

when the number of the received feedback information is greater than or equal to a sixth number or the ratio of the number of the received feedback information to the total number of the feedback information to be received is greater than or equal to a seventh number, the length of the contention window is increased, wherein the feedback information is NACK;

otherwise, the length of the contention window is maintained unchanged.

7. The method as recited in claim 6, further comprising:

and when the LBT in the adjusted contention window is successful, the auxiliary link is used for carrying out the multicast data transmission of the type 1.

8. The method of claim 1, wherein said adjusting the length of the contention window according to the received feedback information comprises:

when at least one group of HARQ-ACK feedback in the received feedback information is ACK, maintaining the length of the contention window unchanged, wherein one group of HARQ-ACK feedback is HARQ-ACK feedback aiming at the same auxiliary link transmission;

otherwise, the length of the contention window is increased.

9. The method as recited in claim 8, further comprising:

And when the LBT in the adjusted contention window is successful, the auxiliary link is used for carrying out the multicast data transmission of the type 2.

10. The method according to claim 6 or 8, wherein the feedback information is received from one or more sets of receiving terminals, the one or more sets of receiving terminals comprising at least opposite ends of the secondary link.

11. The method of claim 10, wherein the opposite ends of the same secondary link belong to the same group of receiving ends, or wherein the opposite ends of one or more secondary links in the same beam direction belong to the same group of receiving ends.

12. The method as recited in claim 1, further comprising:

and when no feedback information is received on the last first number of HARQ-ACK feedback time units, determining the length of the contention window as a preset default value or keeping the length unchanged.

13. The method according to claim 1 or 12, characterized in that the HARQ-ACK feedback time unit comprises a slot in which the PSFCH is located.

14. A contention window adjusting apparatus for a secondary link, comprising:

the acquisition module is used for acquiring feedback information received on the latest first number of HARQ-ACK feedback time units, wherein the first number is a positive integer;

And the adjusting module is used for adjusting the length of the competition window according to the received feedback information.

15. A data transmission method for a secondary link, comprising:

receiving data using the secondary link;

16. A data transmission apparatus for a secondary link, comprising:

a receiving module, configured to receive data using the secondary link;

17. A computer readable storage medium, being a non-volatile storage medium or a non-transitory storage medium, having a computer program stored thereon, characterized in that the computer program when executed by a processor performs the steps of the method of any of claims 1 to 13 or 15.

18. A contention window adjustment apparatus for a secondary link, comprising a memory and a processor, the memory having stored thereon a computer program executable on the processor, wherein the processor performs the steps of the method according to any of claims 1 to 13 when the computer program is executed by the processor.

19. A data transmission device for a secondary link, comprising a memory and a processor, the memory having stored thereon a computer program executable on the processor, characterized in that the processor executes the steps of the method of claim 15 when the processor executes the computer program.