Method and apparatus for sidelink communication

Abstract

The invention relates to a method and a device for sidelink communication between user equipments in a wireless communication network. In one implementation, the method may include receiving discontinuous reception configuration assistance information. The method may also include determining a discontinuous reception configuration scheme of sidelink communication between the first user equipment and the second user equipment based on the discontinuous reception configuration auxiliary information. The method may also include performing sidelink discontinuous reception of the sidelink communication according to the discontinuous reception configuration scheme.

Description

[0001] This application is a divisional application of the invention patent application with the international application number PCT / CN2020 / 075075, the international filing date of February 13, 2020, which entered the Chinese national phase on August 1, 2022, the Chinese national application number 202080095300.6, and the invention title "Method and Device for Sidelink Communication". Technical Field

[0002] The present disclosure generally relates to wireless communication and specifically to sidelink communication between communication terminals including vehicles. Background Art

[0003] A sidelink is a one-way wireless communication service, that is, communication between communication terminals. The Internet of Vehicles (IoV) refers to a large-scale system in which vehicles, pedestrians, roadside devices, and the Internet perform wireless communication and information exchange according to agreed communication protocols and data exchange standards. IoV communication enables vehicles to achieve safe driving, improve traffic efficiency, and obtain convenience or entertainment information. IoV communication can be classified into three types according to the object of wireless communication: communication between vehicles, that is, vehicle-to-vehicle (V2V); communication between a vehicle and a roadside device / network infrastructure, that is, vehicle-to-infrastructure / vehicle-to-network (V2I / V2N); and communication between a vehicle and a pedestrian, that is, vehicle-to-pedestrian (V2P). These types of communication are collectively referred to as vehicle-to-everything (V2X) communication.

[0004] In the research on V2X communication of the 3rd Generation Partnership Project (3GPP), sidelink-based V2X communication between user equipment is one of the ways to implement the V2X standard, in which service data is directly sent from a source user equipment to a destination user equipment via an air interface without being forwarded by a base station and a core network, as Figure 1 shown. This V2X communication is called PC5-based V2X communication or V2X sidelink communication.

[0005] With the technological progress and development of the automation industry, the scenarios of V2X communication are further diversified, and the requirements for performance are also getting higher and higher. Advanced V2X services include vehicle platooning, extended sensors, advanced driving (semi-autonomous driving and fully autonomous driving), and remote driving. Desired performance requirements may include: supporting data packets with a size of 50 to 12,000 bytes, a transmission rate of 2 to 50 messages per second, a maximum end-to-end delay of 3 to 500 milliseconds, a reliability of 90% to 99.999%, a data rate of 0.5 to 1,000 Mbps, and a transmission range of 50 to 1,000 meters. Summary of the Invention

[0006] The present disclosure relates to methods, systems, and devices related to wireless communication, and more particularly to sidelink communication between communication terminals to save power of the communication terminals.

[0007] In one embodiment, a method performed by a first user equipment in a wireless communication network is disclosed. The method may include: receiving discontinuous reception configuration assistance information. The method may further include: determining a discontinuous reception configuration scheme for sidelink communication between the first user equipment and a second user equipment based on the discontinuous reception configuration assistance information. The method may further include: performing sidelink discontinuous reception of the sidelink communication according to the discontinuous reception configuration scheme.

[0008] In another embodiment, a device for wireless communication may include a memory storing instructions and a processing circuitry communicatively coupled to the memory. When the processing circuitry executes the instructions, the processing circuitry is configured to perform the above method.

[0009] In another embodiment, a computer-readable medium including instructions is provided, which when executed by a computer cause the computer to perform the above method.

[0010] The above and other aspects and implementations are described in more detail in the following drawings, description, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 An example diagram of a wireless communication network according to various embodiments is shown.

[0012] Figure 2 A flowchart of a method for sidelink communication according to an embodiment is shown. DETAILED DESCRIPTION

[0013] The techniques and examples of the implementations and / or embodiments in the present disclosure can be used to improve performance in a wireless communication system. The term "exemplary" is used to mean "an example of...", and unless otherwise stated, does not imply an ideal or preferred example, implementation, or embodiment. The use of section headings in the present disclosure is for facilitating understanding, and does not limit the techniques disclosed in the corresponding sections. Note, however, that the implementation can be embodied in many different forms, and thus, the subject matter covered or claimed is intended to be construed as not limited to any of the embodiments to be set forth below. Also note that the implementation can be embodied as a method, device, component, or system. Thus, the embodiments of the present disclosure can, for example, take the form of hardware, software, firmware, or any combination thereof.

[0014] A radio access network provides a network connection between a user equipment (UE) and an information or data network, such as a text, voice or video communication network, the Internet, etc. Example radio access networks can be based on cellular technology, which can also be based on, for example, 4G LTE or 5G NR technology and / or format. Figure 1 FIG. shows an example system diagram of a wireless communication network 100 including UEs 102, 124, and 126 and a radio access network node (WANN) 104 according to various embodiments. UEs 102, 124, and 126 can include, but are not limited to, mobile phones, smart phones, tablets, laptop computers, in-vehicle communication devices, roadside communication devices, smart electronic products or appliances (including air conditioners, TVs, refrigerators, ovens, or other devices capable of wireless communication via a network). UEs can communicate directly with each other via a sidelink. Taking UE 102 as an example, UE 102 can include transceiver circuitry 106, and transceiver circuitry 106 is coupled to antenna 108 to enable wireless communication with radio access network node 104. Transceiver circuitry 106 can also be coupled to a processor 110, and processor 110 can also be coupled to a memory 112 or other storage devices. Memory 112 can store instructions or code therein, and when the instructions or code are read and executed by processor 110, they cause processor 110 to implement the various methods described herein.

[0015] Similarly, radio access network node 104 can include a base station or other wireless network access point capable of wirelessly communicating with one or more UEs via a network. For example, radio access network node 104 can include a 4G LTE base station, a 5G NR base station, a 5G central unit base station, or a 5G distributed unit base station. Each type of these radio access network nodes can be configured to perform a corresponding set of wireless network functions. This set of wireless network functions can be different between different types of radio access network nodes. However, this set of wireless network functions between different types of radio access network nodes may overlap functionally. Radio access network node 104 can include transceiver circuitry 114 coupled to antenna 116, and antenna 116 can include an antenna tower 118 in various ways to enable wireless communication with UEs 102, 124, and 126. Transceiver circuitry 114 can also be coupled to one or more processors 120, and processors 120 can also be coupled to a memory 122 or other storage devices. Memory 122 can store instructions or code therein, and when the instructions or code are read and executed by processor 120, they cause processor 120 to implement the various methods described herein.

[0016] For simplicity and clarity, only one WANN and three UEs are shown in the wireless communication network 100. It should be understood that one or more WANNs may exist in the wireless communication network, and each WANN may serve one or more UEs simultaneously. In addition to the UEs and the WANN, the network 100 may also include any other network nodes with different functions, such as network nodes in the core network of the wireless communication network 100. Furthermore, although various embodiments will be discussed in the context of a specific exemplary wireless communication network 100, the basic principles apply to other applicable wireless communication networks.

[0017] In sidelink communications such as V2X between UEs, the UE needs to monitor sidelink signals throughout the entire range of the sidelink reception resource pool, resulting in high power consumption and low efficiency. One of the objectives of the present disclosure is to reduce the power consumption of sidelink communications while meeting the latency requirements.

[0018] Figure 2 An exemplary implementation 200 for sidelink communication of a user equipment is shown. The UE 102 may receive discontinuous reception (DRX) configuration assistance information (210), determine a DRX configuration scheme (220) for the sidelink communication between the UE 102 and the UE 124 based on the DRX configuration assistance information, and perform sidelink discontinuous reception of the sidelink communication according to the DRX configuration scheme (230). The discontinuous reception configuration scheme may indicate a reception on duration and / or a reception off duration. In this way, the UE 102 may monitor the physical sidelink control channel (PSCCH) to receive sidelink communication only at the time-domain intersection between the reception on duration and the sidelink reception resource pool for sidelink communication.

[0019] Next, reference will be made to Figure 1 and Figure 2 to discuss various detailed embodiments to elaborate on the technical solutions of the present disclosure.

[0020] First Embodiment

[0021] UE 102 may receive DRX configuration assistance information (210) from a radio access network node such as WANN 104. The DRX configuration assistance information may include, for example, recommended sidelink DRX configuration information, sidelink transmission resource pool information, sidelink reception resource pool information, and sidelink DRX configuration information of other UEs. The sidelink DRX configuration information of other UEs may include, for example, the type of traffic in sidelink communication and corresponding DRX configuration parameters. The type of traffic may be represented by a destination identifier, a destination identifier index, a destination UE identifier, or a destination UE identifier index. The destination identifier and the destination identifier index may refer to the type of sidelink traffic without distinguishing the sending UE. The destination UE identifier and the destination UE identifier index may refer to the type of sidelink traffic sent from a specific UE. Examples of various types of traffic may include safety driving information, road traffic information, entertainment information, etc.

[0022] UE 102 may receive sidelink DRX configuration assistance information from WANN 104 via a Radio Resource Control (RRC) dedicated message. Alternatively, UE 102 may receive sidelink DRX configuration assistance information from WANN 104 via a broadcast message.

[0023] After receiving the DRX configuration assistance information (210) from WANN 104, UE 102 may determine a DRX configuration scheme (220) for sidelink communication between UE 102 and UE 124 based on the DRX configuration assistance information. The DRX configuration scheme may include at least one set of DRX configuration parameters. A set of DRX configuration parameters may include, for example, a sidelink DRX cycle, a duration, an on-duration mode, a first inactivity timer, and a second inactivity timer. The on-duration mode may include a time slot bitmap indicating the sidelink DRX on-duration, which will be discussed in detail later.

[0024] Specifically, UE 102 may determine or update its DRX configuration parameters for sidelink communication by itself using the DRX configuration assistance information as a reference, and then apply the determined / updated DRX configuration parameters to the DRX configuration scheme of sidelink communication.

[0025] Once the sidelink DRX configuration scheme is set, UE 102 does not have to continuously monitor the PSCCH. Instead, UE 102 may monitor the PSCCH only during the reception on-duration. However, it may still monitor other physical layer channels at any time.

[0026] Optionally, before receiving DRX configuration assistance information from the WANN 104, the UE 102 may send a DRX configuration assistance information request message to the WANN 104. The DRX configuration assistance information request message may include, for example, a destination identifier, a list of destination user equipment identifiers, and a transmission mode. The transmission mode may include, for example, unicast, multicast, and broadcast.

[0027] In some implementations, through the DRX configuration assistance information request message, the WANN 104 may learn about the types of services that the UE 102 is interested in monitoring and receiving, and then send only the DRX configuration assistance information related to the interested service types to the UE 102.

[0028] Optionally, before receiving DRX configuration assistance information from the WANN 104, the UE 102 may send capability information indicating whether the UE 102 supports sidelink discontinuous reception, user equipment status information, and / or quality of service requirements to the WANN 104. The UE status information may include, for example, a pedestrian UE, a non-pedestrian UE, a UE with power saving requirements, a UE without power saving requirements, and a power saving level. The quality of service requirements may include, for example, time delay, reliability, service priority, error rate, quality of service identifier, and service flow quality identifier.

[0029] For example, the WANN 104 may determine whether to send DRX configuration assistance information to the UE 102 based on the capability information. For another example, the WANN 104 may determine the DRX configuration assistance information, such as a recommended sidelink DRX configuration scheme, based on the user equipment status information and / or quality of service requirements.

[0030] Second Embodiment

[0031] The UE 102 may receive DRX configuration assistance information (210) from another UE such as the UE 124. The DRX configuration assistance information may include, for example, recommended sidelink DRX configuration information, semi-persistent scheduling (SPS) assistance information, sidelink transmission resource pool information, sidelink reception resource pool information, power saving requirements, quality of service information, and sidelink control information indicating a retransmission interval or a resource reservation period.

[0032] The UE 102 may receive the DRX configuration assistance information from the UE 124 via a unicast sidelink RRC message, a multicast sidelink RRC message, or a broadcast sidelink RRC message.

[0033] After receiving the DRX configuration assistance information (210) from UE 124, UE 102 may determine a DRX configuration scheme (220) for sidelink communication between UE 102 and UE 124 based on the DRX configuration assistance information. The DRX configuration scheme may include at least one set of DRX configuration parameters. A set of DRX configuration parameters may include, for example, a sidelink DRX period, duration, on-duration pattern, a first inactivity timer, and a second inactivity timer.

[0034] Specifically, UE 102 may use the DRX configuration assistance information as a reference to determine or update its DRX configuration parameters for sidelink communication on its own, and then apply the determined / updated DRX configuration parameters to determine the DRX configuration scheme for sidelink communication.

[0035] Once the sidelink DRX configuration scheme is set, UE 102 does not have to continuously monitor the PSCCH. Instead, UE 102 may monitor the PSCCH only during the reception on-duration.

[0036] Optionally, after receiving the sidelink DRX configuration assistance information sent from UE 124, UE 102 may send the sidelink DRX configuration assistance information to WANN 104. Alternatively or additionally, UE 102 may send both the sidelink DRX configuration assistance information and the identity of UE 124 to WANN 104. The identity of UE 124 may be represented by a destination UE identifier, a destination UE identifier index, a destination identifier, or a destination identifier index.

[0037] Third Embodiment

[0038] As an example, this embodiment will discuss determining a DRX configuration scheme based on a DRX configuration assistant in different scenarios.

[0039] Scenario 1: UE is in unicast sidelink communication

[0040] In this scenario, the UEs (such as UE 102 and UE 124) in communication may establish a sidelink RRC connection. A transmitting UE such as UE 124 may send SPS assistance information to a receiving UE such as UE 102 based on the transmitting resource pool of UE 124 and the traffic arrival period. In some implementations, the transmitting UE may send only the SPS assistance information related to the receiving UE. In this way, the receiving UE may determine the sidelink DRX configuration parameters based on the received SPS assistance information. For example, the receiving UE may derive the arrival time of data packets from the SPS assistance information.

[0041] Alternatively or additionally, the sending UE may send the recommended sidelink DRX configuration information to the receiving UE based on the arrival pattern of its predicted transmission traffic. If the receiving UE has unicast connections with multiple sending UEs, it may receive different DRX configuration recommendations from the multiple sending UEs. Then, the receiving UE may use these DRX configuration recommendations as a reference to determine the sidelink DRX configuration parameters by itself.

[0042] Scenario 2: The UE is in multicast communication

[0043] In this scenario, the sending UE may send the SPS assistance information to the receiving UE via a multicast message based on the sending resource pool and traffic arrival period of the sending UE. In some implementations, the sending UE may only send the SPS assistance information related to the receiving UE. In this way, the receiving UE may determine the sidelink DRX configuration parameters based on the received SPS assistance information. For example, the receiving UE may derive the arrival time of data packets from the SPS assistance information.

[0044] Alternatively or additionally, the sending UE may send the recommended sidelink DRX configuration information to the receiving UE via a multicast message based on the arrival pattern of its predicted transmission traffic. If the receiving UE communicates with multiple sending UEs, it may receive different DRX configuration recommendations from the multiple sending UEs. Then, the receiving UE may use these DRX configuration recommendations as a reference to determine the sidelink DRX configuration parameters by itself.

[0045] Finally, a multicast sidelink RRC connection may be established to exchange information. Alternatively, the UEs may establish unicast connections with each other individually for sending sidelink DRX-related configuration information.

[0046] Scenario 3: The UE is in broadcast communication

[0047] In this scenario, the sending UE may send the SPS assistance information to the receiving UE via a broadcast message based on the sending resource pool and traffic arrival period of the sending UE. In some implementations, the sending UE may only send the SPS assistance information related to the receiving UE. In this way, the receiving UE may determine the sidelink DRX configuration parameters based on the received SPS assistance information. For example, the receiving UE may derive the arrival time of data packets from the SPS assistance information.

[0048] Alternatively or additionally, the sending UE may send the recommended sidelink DRX configuration information to the receiving UE via a broadcast message based on the arrival pattern of its predicted transmission traffic. If the receiving UE communicates with multiple sending UEs, it may receive different DRX configuration recommendations from the multiple sending UEs. Then, the receiving UE may use these DRX configuration recommendations as a reference to determine the sidelink DRX configuration parameters by itself.

[0049] Finally, sidelink broadcast RRC messages for exchanging information can be defined. Alternatively, UEs can exchange information via sidelink signaling such as network protocol messages (NAS messages). Subframes between UEs should be aligned after the information exchange.

[0050] Fourth Embodiment

[0051] As an example, this embodiment will discuss using a time slot bitmap to indicate the on-duration pattern in DRX configuration parameters.

[0052] The time slot bitmap can indicate which time slots or symbols are sidelink reception resources in the sidelink resource pool. In some implementations, a sidelink DRX cycle is configured, and the sidelink DRX cycle can be an integer multiple of the cycle of the sidelink reception resource pool (i.e., the length of the time slot bitmap). Alternatively, the cycle of the sidelink reception resource pool can be an integer multiple of the sidelink DRX cycle. Therefore, the reception on-duration can be configured as the number of time slots within the sidelink resource pool after the start of the DRX cycle.

[0053] Similarly, the time slot bitmap can indicate which time slots within the indicated transmission resource range are configured as reception on or reception off. In some implementations, a sidelink DRX bitmap is configured. For example, there are 10 time slots in one cycle of the sidelink resource pool, and time slots 1, 2, 6, 7, 9 are the sidelink reception resource pool. Based on these five time slots, the sidelink DRX bitmap can be used to indicate which of them are reception on-duration time slots. Specifically, since the number of time slots for sidelink reception within one cycle of the sidelink resource pool is five, the cycle of the sidelink DRX bitmap can be configured as five. The sidelink DRX bitmap can be, for example, [1,0,1,0,1], which means DRX is on in time slots 1, 6, and 9, and DRX is off in time slots 2 and 7. In a similar way, DRX is on in time slots 11, 16, 19, 21, 26, 29, ……, and DRX is off in time slots 12, 17, 22, 27, ……

[0054] Optionally, the cycle of the sidelink DRX bitmap can be longer than the cycle of the sidelink resource pool. In this way, the parameter sidelink DRX cycle can be configured as an integer N times the cycle of the sidelink reception resource pool. If N is 2, the cycle of the sidelink DRX bitmap is equal to ten (2 x 5). For example, the sidelink DRX bitmap can be [1,0,1,0,1,1,0,0,0,1], which means DRX is on in time slots 1, 6, 9, 11, 19, and DRX is off in time slots 2, 7, 12, 16, 17.

[0055] Fifth Embodiment

[0056] As an example, this embodiment will discuss that the UE 102 can be configured with multiple DRX configuration schemes, and each DRX configuration scheme can have a set of sidelink DRX configuration parameters.

[0057] In some implementations, the multiple DRX configuration schemes can be configured according to different destination UEs. In particular, the DRX on-duration mode can be customized for different destination UEs. For example, the UE 102 establishes sidelink connections with both the UE 124 and the UE 126. The UE 124 and the UE 126 have completely different transmit resource pool configurations, so the resource locations to be monitored can be different. In this case, two DRX configuration schemes can be configured for the UE 102 to respectively adapt to the different resource locations to be monitored.

[0058] In another implementation, the multiple DRX configuration schemes can be configured according to different sidelink receive resource pool configurations. For example, if the UE 102 is configured with multiple receive resource pools, the multiple DRX configuration schemes can respectively correspond to these receive resource pools.

[0059] Sixth Embodiment

[0060] As an example, this embodiment will discuss the reporting of the measured sidelink channel state information (CSI) by the UE 102 in the context where the UE 102 is configured with a DRX configuration scheme.

[0061] Specifically, the UE 102 can receive sidelink CSI report configuration information including CSI report masking from, for example, the UE 124. The CSI report masking can indicate whether to delay reporting the sidelink channel state indication until the sidelink active time. The receive on / off duration set in the DRX configuration scheme can define the sidelink active / inactive time for the UE 102. In the case where the CSI report masking indicates a delay is required, the UE 102 can delay reporting the sidelink CSI until the sidelink active time defined by the DRX configuration scheme. Therefore, if the UE is configured with sidelink DRX, the most recent CSI measurement timing can occur during the sidelink DRX active time of the CSI to be reported.

[0062] Seventh Embodiment

[0063] In the context of side - link communication, the side - link control information (SCI) of the transmitting UE may carry an SPS period or a re - transmission interval or a resource reservation period. At the next cycle indicated by the SPS period or at the re - transmission position indicated by the re - transmission interval or the resource reservation period, the receiving UE may be in the DRX - off state, i.e., the inactive state. This is the case when the transmitting UE does not know the DRX configuration scheme of the receiving UE. The problem is whether the receiving UE can receive side - link communication at the next new transmission or re - transmission position despite being in the DRX - off state.

[0064] One option is that, regardless of the DRX - off state, the UE must wake up at the next new transmission or re - transmission position indicated by the SCI. In this case, due to the received SCI, re - transmission is likely to occur, which may also trigger the restart of the timers drx - RetransmissionTimerSL and drx - HARQ - RTT - TimerSL.

[0065] Another option is not to change the provisions in the DRX configuration scheme. Thus, the receiving UE may not receive the SCI message during its DRX receive - off duration. But it can receive messages from the physical side - link shared channel (PSSCH) resources indicated by the previous SCI. This option is applicable to the broadcast scenario without feedback.

[0066] Another option is to limit the configuration of DRX and SPS. For example, it is required that the duration of the timer drx - InactivityTimer must be longer than the maximum SPS period.

[0067] In some implementations, if the transmitting UE can estimate the time of the next transmission and the receiving UE is only interested in the current transmission service, an SPS - related timer can be introduced. For example, when the receiving UE receives an SCI indicating a re - transmission interval or a resource reservation period from the transmitting UE, the receiving UE can start an SPS silent timer, and the timer duration of the SPS silent timer is equal to the re - transmission interval or the resource reservation period. During this timer duration, the receiving UE is in the DRX - off state in the relevant process. When the SPS silent timer expires, the receiving UE can start an SPS active timer for the relevant process and switch to the DRX - on state, i.e., the active state, until the SPS active timer expires, regardless of the DRX configuration scheme. The duration of the SPS active timer is configurable within a duration range.

[0068] Optionally, the receiving UE may receive SPS activation timer configuration information and / or SPS silence timer configuration information before receiving DRX configuration assistance information. The SPS activation timer configuration information may indicate the duration of the SPS activation timer, and the SPS silence timer configuration information may indicate the duration of the SPS silence timer.

[0069] Throughout the specification and claims, terms may have nuanced meanings that are indicated or implied in the context, beyond the explicitly stated meanings. Similarly, the phrase "in one embodiment / implementation" as used herein does not necessarily refer to the same embodiment, and the phrase "in another embodiment / implementation" as used herein does not necessarily refer to a different embodiment. For example, the claimed subject matter is intended to include combinations of all or part of the example embodiments.

[0070] Generally speaking, terms can be understood at least in part from their use in context. For example, terms such as "and", "or", or "and / or" as used herein can have multiple meanings, which can depend at least in part on the context in which these terms are used. Generally, "or" if used to relate a list, such as A, B, or C, is intended to mean A, B, and C (used in the inclusive sense here), as well as A, B, or C (used in the exclusive sense here). Additionally, at least in part depending on the context, the term "one or more" as used herein can be used to describe any feature, structure, or property in a singular sense, or can be used to describe a combination of features, structures, or properties in a plural sense. Similarly, at least in part depending on the context, terms such as "a", "an", or "the" can be understood to convey a singular usage or convey a plural usage. Additionally, again, at least in part depending on the context, the term "based on" can be understood to not necessarily convey a set of exclusive factors, but can allow for the existence of additional factors that are not necessarily explicitly described.

[0071] References throughout the specification to features, advantages, or similar language do not imply that all features and advantages that can be achieved with the present solution should be included in or included in any single implementation thereof. On the contrary, language referring to features and advantages is understood to mean that a particular feature, advantage, or characteristic described in connection with an embodiment is included in at least one embodiment of the present solution. Thus, the discussion of features and advantages and similar language throughout the specification can, but does not necessarily, refer to the same embodiment.

[0072] Furthermore, the described features, advantages, and characteristics of the present solution may be combined in any suitable manner in one or more embodiments. Based on the description herein, those of ordinary skill in the relevant art will recognize that the present solution may be practiced without one or more specific features or advantages of a particular embodiment. In other instances, additional features and advantages may be found in certain embodiments that may not be present in all embodiments of the present solution.

Claims

1. A method performed by a second user equipment in a wireless communication network, comprising: sending discontinuous reception configuration assistance information; receiving discontinuous reception configuration parameters for sidelink communication between the first user equipment and the second user equipment; applying the discontinuous reception configuration parameters to a discontinuous reception configuration scheme for the sidelink communication; and in response to receiving sidelink control information including a retransmission interval or a resource reservation period from the first user equipment, waking up the first user equipment at the next new transmission or retransmission position indicated by the sidelink control information.

2. The method according to claim 1, wherein the discontinuous reception configuration scheme indicates a reception on duration, and performing the sidelink discontinuous reception comprises: monitoring a physical sidelink control channel to receive the sidelink communication only at a time domain intersection between the reception on duration and a sidelink reception resource pool for the sidelink communication.

3. The method according to claim 1, further comprising: performing sidelink discontinuous reception of the sidelink communication according to the discontinuous reception configuration scheme.

4. The method according to claim 1, wherein the discontinuous reception configuration scheme includes one or more sets of discontinuous reception configuration parameters, and each of the one or more sets of discontinuous reception configuration parameters includes at least one of the following: a sidelink discontinuous reception period, a duration, an on duration mode, a first inactivity timer, and a second inactivity timer.

5. The method according to claim 1, wherein the discontinuous reception configuration assistance information comprises: expected sidelink discontinuous reception configuration information.

6. The method according to claim 1, wherein the discontinuous reception configuration assistance information is sent to the first user equipment for reception via a unicast sidelink radio resource control message.

7. The method according to claim 1, further comprising: in response to receiving sidelink control information indicating a retransmission interval or a resource reservation period from the first user equipment, starting a semi-persistent scheduling silent timer with a duration equal to half of the retransmission interval or the resource reservation period, during which the second user equipment is in an inactive state; and in response to expiration of the semi-persistent scheduling silent timer, starting a semi-persistent scheduling active timer and switching the second user equipment to an active state until the semi-persistent scheduling active timer expires.

8. The method according to claim 7, further comprising: before sending the discontinuous reception configuration assistance information, sending semi-persistent scheduling active timer configuration information indicating the duration of the semi-persistent scheduling active timer, or semi-persistent scheduling silent timer configuration information indicating the duration of the semi-persistent scheduling silent timer.

9. A device for communication, comprising: a memory operably storing computer-readable instructions; and a processor circuit operably reading the computer-readable instructions, the processor circuit being configured to: send discontinuous reception configuration assistance information; Receive discontinuous reception configuration parameters for sidelink communication between a first user equipment and a second user equipment; Apply the discontinuous reception configuration parameters to a discontinuous reception configuration scheme for the sidelink communication; And In response to receiving sidelink control information including a retransmission interval or a resource reservation period from the first user equipment, wake up the second user equipment at the next new transmission or retransmission position indicated by the sidelink control information.

10. The apparatus according to claim 9, wherein the processor circuitry is configured to: Receive the discontinuous reception configuration assistance information from the second user equipment.

11. The apparatus according to claim 9, wherein the processor circuitry is further configured to: Send an identifier of the second user equipment to a radio access node, the identifier of the second user equipment including a destination user equipment identifier.

12. A non-transitory machine-readable medium having instructions stored thereon that, when executed, cause the machine to: Send discontinuous reception configuration assistance information; Receive discontinuous reception configuration parameters for sidelink communication between a first user equipment and a second user equipment; Apply the discontinuous reception configuration parameters to a discontinuous reception configuration scheme for the sidelink communication; and In response to receiving sidelink control information including a retransmission interval or a resource reservation period from the first user equipment, wake up the second user equipment at the next new transmission or retransmission position indicated by the sidelink control information.

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