Discontinuous reception for sidelink communication in wireless communication systems

Abstract

Methods, systems, and apparatus for wireless communications are described. A user equipment (UE) may send sidelink discontinuous reception (DRX) information to a base station when operating in connected mode. In some examples, the UE may include the sidelink DRX information in UE assistance information (UAI). The sidelink DRX information may include preferences for a DRX cycle, a DRX active duration, a DRX inactive duration, etc. for sidelink DRX operation. The UE may receive a message including a sidelink DRX configuration from a base station based on the sidelink DRX information and operate according to the sidelink DRX configuration.

Description

Background Art

[0001] The following relates to wireless communications, and more particularly, the following relates to managing sidelink communications in a wireless communications system.

[0002] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems that may be referred to as new radio (NR) systems. These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread spectrum orthogonal frequency division multiplexing (DFT-S-OFDM).

[0003] A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each base station or network access node simultaneously supporting communication for multiple communication devices (which may also be referred to as user equipment (UE)). Some wireless communication systems may support sidelink communication between multiple communication devices. Examples of sidelink communication may include, but are not limited to, device-to-device (D2D) communication, vehicle-based communication (which may also be referred to as a vehicle-to-everything (V2X) communication system), vehicle-to-vehicle (V2V) communication system, cellular V2X (C-V2X) communication system, etc. Summary of the invention

[0004] A method of wireless communication at a UE is described. The method may include sending sidelink DRX (DRX) information to a base station when operating in a connected mode, receiving a message including a sidelink DRX configuration from the base station based on the sidelink DRX information, and operating according to the sidelink DRX configuration.

[0005] An apparatus for wireless communication is described. The apparatus may include a processor and a memory coupled to the processor, the processor and the memory being configured to: send sidelink DRX information to a base station when operating in a connected mode, receive a message including a sidelink DRX configuration from the base station based on the sidelink DRX information, and operate according to the sidelink DRX configuration.

[0006] Another apparatus for wireless communication is described. The apparatus may include means for sending sidelink DRX information to a base station when operating in connected mode, receiving a message including a sidelink DRX configuration from the base station based on the sidelink DRX information, and operating according to the sidelink DRX configuration.

[0007] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to: send sidelink DRX information to a base station when operating in a connected mode, receive a message including a sidelink DRX configuration from the base station based on the sidelink DRX information, and operate according to the sidelink DRX configuration.

[0008] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: monitoring a sidelink channel to receive a discovery signal from a second UE during an active duration of a DRX cycle based on the sidelink DRX configuration; and receiving the discovery signal from the second UE based on the monitoring.

[0009] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the sidelink DRX configuration can be based on a discovery resource pool corresponding to time and frequency resources associated with monitoring the sidelink channel to receive the discovery signal from the second UE.

[0010] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: broadcasting a discovery request message during the active duration of the DRX cycle based on the sidelink DRX configuration; monitoring the sidelink channel during the active duration of the DRX cycle to receive a discovery response message from the second UE; and receiving the discovery response message from the second UE based on the monitoring, the discovery signal including the discovery response message.

[0011] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for selecting the second UE for relay communication between the UE and the base station or between the UE and a third UE or both based on the discovery signal, wherein the relay communication corresponds to a layer 2 (L2) forwarding function or a layer 3 (L3) forwarding function.

[0012] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining a sidelink DRX mode for monitoring the sidelink channel to receive the discovery signal from the second UE based on the sidelink DRX configuration, the sidelink DRX mode including the DRX cycle, the DRX cycle including the active duration and the inactive duration.

[0013] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: receiving a synchronization signal from the second UE on a sidelink broadcast channel; and synchronizing with the second UE based on the synchronization signal.

[0014] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: receiving a downlink signal from the base station using a cellular link based on the sidelink DRX configuration; or sending an uplink signal to the base station using the cellular link based on the sidelink DRX configuration.

[0015] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining a sidelink DRX mode for receiving the downlink signal or sending the uplink signal or both based on the sidelink DRX configuration, the sidelink DRX mode comprising a DRX cycle, the DRX cycle comprising an active duration and an inactive duration, wherein receiving the downlink signal or sending the uplink signal or both may be based on the sidelink DRX mode.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the message may include operations, features, units, or instructions for receiving a radio resource control (RRC) reconfiguration message including the sidelink DRX configuration from the base station.

[0017] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: sending an RRC reconfiguration completion message to the base station based on the RRC reconfiguration message, wherein operating according to the sidelink DRX configuration may be based on the RRC reconfiguration completion message.

[0018] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for including the sidelink DRX information in UE assistance information (UAI), sending the UAI including the sidelink DRX information to the base station when operating in the connected mode, wherein receiving the message including the sidelink DRX configuration may be based on the UAI.

[0019] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining a single-connection mode DRX cycle for sidelink communication or cellular communication or both based on the sidelink DRX configuration, and wherein operating according to the sidelink DRX configuration may be based on the single-connection mode DRX cycle.

[0020] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining a DRX cycle based on a relay service associated with a second UE or a quality of service (QoS) associated with a data service of the UE, or both, wherein the sidelink DRX information includes an indication of the DRX cycle.

[0021] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining a value of an active timer associated with a DRX cycle based on a relay service associated with a second UE or a QoS associated with a data service of the UE, or both, wherein the sidelink DRX information includes an indication of the value of the active timer associated with the DRX cycle.

[0022] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining a value of an inactivity timer associated with a DRX cycle based on a relay service associated with a second UE or a QoS associated with a data service of the UE, or both, wherein the sidelink DRX information includes an indication of the value of the inactivity timer associated with the DRX cycle.

[0023] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining an offset between the start of a DRX cycle and the start of an active duration of the DRX cycle based on a relay service associated with a second UE or a QoS associated with a data service of the UE, or both, wherein the sidelink DRX information includes an indication of the offset.

[0024] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: determining, based on the sidelink DRX configuration, a first sidelink DRX mode associated with the sidelink DRX configuration for monitoring a sidelink channel to receive a discovery signal; determining, based on the sidelink DRX configuration, a second sidelink DRX mode associated with the sidelink DRX configuration for receiving a downlink signal from the base station or sending an uplink signal to the base station, or both, wherein the first sidelink DRX mode may be different from the second sidelink DRX mode.

[0025] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the sidelink DRX configuration includes a first indication of the first sidelink DRX mode or a second indication of the second sidelink DRX mode, or both.

[0026] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the sidelink DRX configuration includes a connected mode DRX configuration.

[0027] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the sidelink DRX configuration includes a sidelink DRX preference associated with a discovery process including a first model discovery process or a second model discovery process.

[0028] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the sidelink DRX configuration includes a sidelink DRX preference associated with receiving a downlink signal from the base station or sending an uplink signal to the base station, or both.

[0029] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the UE comprises a remote UE and the second UE comprises a relay UE between the remote UE and the base station.

[0030] A wireless communication method at a UE is described. The method may include: when operating in an out-of-coverage mode, an idle mode, or an inactive mode, receiving a message including a group sidelink DRX configuration associated with a group of UEs; determining a time period during which a sidelink channel can be discontinuously monitored based on the group sidelink DRX configuration; and monitoring the sidelink channel during the time period.

[0031] An apparatus for wireless communication is described. The apparatus may include a processor and a memory coupled to the processor, the processor and the memory being configured to: when operating in an out-of-coverage mode, an idle mode, or an inactive mode, receive a message including a group sidelink DRX configuration associated with a group of apparatuses; determine a time period during which a sidelink channel can be discontinuously monitored based on the group sidelink DRX configuration; and monitor the sidelink channel during the time period.

[0032] Another apparatus for wireless communication is described. The apparatus may include means for: while operating in an out-of-coverage mode, an idle mode, or an inactive mode, receiving a message including a group sidelink DRX configuration associated with a group of apparatuses; determining a time period during which a sidelink channel can be discontinuously monitored based on the group sidelink DRX configuration; and monitoring the sidelink channel during the time period.

[0033] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to: when operating in an out-of-coverage mode, an idle mode, or an inactive mode, receive a message including a group sidelink DRX configuration associated with a group of UEs; determine a time period during which a sidelink channel can be discontinuously monitored based on the group sidelink DRX configuration; and monitor the sidelink channel during the time period.

[0034] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the message may include operations, features, units, or instructions for receiving a system information block (SIB) or an RRC reconfiguration message including the group sidelink DRX configuration.

[0035] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for enabling discontinuous monitoring of the sidelink channel based on the SIB or the RRC reconfiguration message.

[0036] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for disabling the DRX mode based on QoS associated with pending data traffic satisfying a QoS threshold.

[0037] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the group sidelink DRX configuration includes a DRX cycle that is common to the group of UEs.

[0038] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the sidelink DRX configuration includes an active duration of a DRX cycle that is common to the group of UEs.

[0039] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the sidelink DRX configuration includes a group offset duration between the start of a DRX cycle and an active duration of the DRX cycle, wherein the group offset duration may be common to the group of UEs.

[0040] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the time period may be common to the group of UEs.

[0041] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the UEs may be grouped in the set of UEs based on a path loss parameter.

[0042] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the UEs may be grouped into the group of UEs based on QoS associated with data traffic of the UEs.

[0043] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining a UE-specific offset duration associated with an active duration of a DRX cycle based on the sidelink DRX configuration, wherein monitoring the sidelink channel includes.

[0044] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the UE-specific offset duration may be based on a layer 2 (L2) identifier associated with the UE.

[0045] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for enabling a DRX mode based on the message.

[0046] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for enabling a DRX mode based on QoS associated with pending data traffic satisfying a QoS threshold.

[0047] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for enabling a DRX mode based on a power level of the UE satisfying a power level threshold.

[0048] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for avoiding monitoring one or more resource pools during an inactivity duration of a DRX cycle based on the group sidelink DRX configuration.

[0049] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for avoiding monitoring one or more resource pools associated with monitoring the sidelink channel for the discovery signal based on a group resource pool configuration associated with monitoring the discovery signal.

[0050] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for broadcasting a discovery request message during an inactivity duration of a DRX cycle associated with the group of UEs based on a data traffic condition of the UE, wherein the inactivity duration may be common to the group of UEs, wherein the inactivity duration and the DRX cycle may be common to the group of UEs.

[0051] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: receiving a downlink signal from a base station during an inactive duration of a DRX cycle associated with the group of UEs; or, and sending an uplink signal to the base station during an inactive duration of a DRX cycle associated with the group of UEs, wherein the inactive duration and the DRX cycle may be common to the group of UEs.

[0052] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for synchronizing with the group of UEs based on a synchronization signal received on a sidelink broadcast channel from at least one UE associated with the group of UEs.

[0053] A wireless communication method is described. The method may include: determining a DRX cycle based on a sidelink DRX configuration, the DRX cycle including an active duration and an inactive duration; receiving a discovery request message from a second UE during the active duration of the DRX cycle; and sending a discovery response message to the second UE during the active duration of the DRX cycle.

[0054] An apparatus for wireless communication is described. The apparatus may include a processor and a memory coupled to the processor, the processor and the memory being configured to: determine a DRX cycle based on a sidelink DRX configuration, the DRX cycle including an active duration and an inactive duration; receive a discovery request message from a second UE during the active duration of the DRX cycle; and send a discovery response message to the second UE during the active duration of the DRX cycle.

[0055] Another apparatus for wireless communication is described. The apparatus may include means for determining a DRX cycle based on a sidelink DRX configuration, the DRX cycle including an active duration and an inactive duration; receiving a discovery request message from a second UE during the active duration of the DRX cycle; and sending a discovery response message to the second UE during the active duration of the DRX cycle.

[0056] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to: determine a DRX cycle based on a sidelink DRX configuration, the DRX cycle including an active duration and an inactive duration; receive a discovery request message from a second UE during the active duration of the DRX cycle; and send a discovery response message to the second UE during the active duration of the DRX cycle.

[0057] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the sidelink DRX configuration may be based on a discovery resource pool corresponding to time and frequency resources for receiving the discovery request message or sending the discovery response message, or both.

[0058] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for establishing a connection with the second UE to relay communications for the UE, wherein the relayed communications correspond to an L2 forwarding function or an L3 forwarding function.

[0059] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: sending a synchronization signal to the second UE on a sidelink broadcast channel; and synchronizing with the second UE based on the synchronization signal.

[0060] A wireless communication method at a base station is described. The method may include: receiving sidelink DRX information from a UE; determining a sidelink DRX mode for the UE based on the sidelink DRX information; and sending a message including a sidelink DRX configuration, the sidelink DRX configuration including an indication of the sidelink DRX mode for the UE.

[0061] An apparatus for wireless communication is described. The apparatus may include a processor and a memory coupled to the processor, the processor and the memory being configured to: receive sidelink DRX information from a UE; determine a sidelink DRX mode for the UE based on the sidelink DRX information; and send a message including a sidelink DRX configuration, the sidelink DRX configuration including an indication of the sidelink DRX mode for the UE.

[0062] Another apparatus for wireless communication is described. The apparatus may include means for: receiving sidelink DRX information from a UE; determining a sidelink DRX mode for the UE based on the sidelink DRX information; and sending a message including a sidelink DRX configuration, the sidelink DRX configuration including an indication of the sidelink DRX mode for the UE.

[0063] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to: receive sidelink DRX information from a UE; determine a sidelink DRX mode for the UE based on the sidelink DRX information; and send a message including a sidelink DRX configuration, the sidelink DRX configuration including an indication of the sidelink DRX mode for the UE.

[0064] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the message may include operations, features, units, or instructions for sending an RRC reconfiguration message including the sidelink DRX configuration to the UE.

[0065] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for receiving an RRC reconfiguration complete message to the base station based on the RRC reconfiguration message.

[0066] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for receiving, from the UE, a UAI including the sidelink DRX information.

[0067] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining the sidelink DRX mode for the UE based on a resource pool configuration for the UE.

[0068] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: determining, based on the sidelink DRX information, a first sidelink DRX mode associated with the sidelink DRX configuration for monitoring a sidelink channel for a discovery signal at the UE; and determining, based on the sidelink DRX information, a second sidelink DRX mode associated with the sidelink DRX configuration for receiving a downlink signal from the base station at the UE, wherein the first sidelink DRX mode may be different from the second sidelink DRX mode.

[0069] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the sidelink DRX configuration includes a connected mode DRX configuration.

[0070] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the sidelink DRX configuration includes a sidelink DRX preference. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 and Figure 2 An example of a wireless communication system in accordance with one or more aspects of the present disclosure is described.

[0072] Figure 3 An example of a process flow in accordance with one or more aspects of the present disclosure is illustrated.

[0073] Figures 4 to 7 An example of a timeline in accordance with one or more aspects of the present disclosure is illustrated.

[0074] Figure 8 and Fig. 9 A block diagram of an apparatus according to one or more aspects of the present disclosure is shown.

[0075] Fig.10 A block diagram of a UE communications manager is shown in accordance with one or more aspects of the present disclosure.

[0076] Fig.11 A diagram of a system including an apparatus according to one or more aspects of the present disclosure is shown.

[0077] Fig.12 and Fig.13A block diagram of an apparatus according to one or more aspects of the present disclosure is shown.

[0078] Fig.14 A block diagram of a base station communications manager is shown in accordance with one or more aspects of the present disclosure.

[0079] Fig.15 A diagram of a system including an apparatus according to one or more aspects of the present disclosure is shown.

[0080] Figures 16 to 19 A flow chart illustrating a method according to one or more aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0081] A wireless communication system may include multiple communication devices, such as UEs and base stations, which may provide wireless communication services to other UEs. For example, a base station may be a next-generation node B or a gigabit node B (both of which may be referred to as gNBs), which may support multiple radio access technologies, including 4G systems (e.g., LTE systems) and 5G systems, which may be referred to as NR systems. Some wireless communication systems may also support sidelink communications between multiple UEs. Examples of sidelink communications may include, but are not limited to, D2D communications, vehicle-based communications, which may also be referred to as V2X communication systems, V2V communication systems, and the like. Some wireless communication systems may support relay operations to expand network coverage for UEs.

[0082] The UE may communicate directly with a network device (e.g., a network operator of a network (e.g., a 4G network, a 5G network)). Alternatively, the UE may communicate indirectly with the network device through another UE (also referred to as a relay UE). For example, the UE and the base station may not be able to communicate directly because the UE may be outside the coverage of the base station, so a relay UE is required to relay the communication between the UE and the base station. A UE outside the coverage may be referred to as a remote UE in this article. As described herein, a remote UE may discover a relay UE based on a discovery message (also referred to as a discovery signal) broadcast from a relay UE and received at the remote UE. In another example, the remote UE may notify a sidelink discovery request message to which the relay UE may respond. These discovery messages may include certain information that the remote UE or the relay UE or both may use to establish a sidelink (also referred to as a sidelink connection) for relaying transmissions to and from the base station, for example, for sending and receiving information related to services provided by the base station. In some cases, a remote UE seeking to discover a relay UE to act as a repeater may consume unnecessary power when monitoring discovery messages. As a result, the battery life of the remote UE may be affected, which may also affect the reliability and latency of receiving service-related information at the remote UE.

[0083] Various aspects of the described technology relate to configuring a remote UE to operate in a power saving mode (also referred to as a DRX mode) to reduce its power consumption when discovering and selecting a relay UE as a relay between the remote UE and a base station. When in power saving mode, the remote UE can power on appropriate circuits for a period of time to monitor a wireless channel for discovery messages from other UEs. After the period has elapsed, the remote UE can be powered off for a period of time. The power saving mode including the period for powering on and off can be specific to when the remote UE monitors discovery messages for candidate relay UEs. When a candidate relay UE is detected, based on the discovery message, the remote UE can select the candidate relay UE as a relay based on whether the sidelink quality meets a threshold or the candidate relay UE can provide the connection service requested by the remote UE. The remote UE can evaluate the former condition by performing measurements on the discovery message received from the candidate relay UE, and it checks the latter condition by referring to a field (e.g., a relay service code) included in the discovery message provided by the candidate relay UE.

[0084] The period associated with the power saving mode can be configured and provided by the base station based on information provided by the remote UE. For example, the remote UE can provide a DRX preference indicating a preference for one or more DRX parameters, including a DRX cycle, an active duration of the DRX cycle, an inactive duration of the DRX cycle, a DRX cycle, a periodicity of the DRX cycle, an offset period associated with the active duration of the DRX cycle, a DRX inactivity timer, a DRX activity timer, a DRX retransmission timer, and the like. In some cases, the remote UE may belong to a group of UEs that may share a configuration (e.g., a sidelink DRX configuration) for the power saving mode. In order to avoid interference between UEs in the group, each UE may have an offset period for when to power on and off indicated in the configuration. Therefore, for sidelink communications, the UE may experience power savings due to support for relay selection and discovery (e.g., using a sidelink DRX configuration for sidelink communications and relay monitoring and discovery) according to the power saving mode.

[0085] Aspects of the subject matter described in the present disclosure may be implemented to achieve one or more of the following potential improvements, among others. The techniques employed by the UE may provide benefits and enhancements to the operation of the UE. For example, the operations performed by the UE may provide power saving improvements to the UE. In some examples, configuring the UE to support sidelink DRX for relay discovery and selection may reduce the power consumption of the UE.

[0086] Various aspects of the present disclosure are first described in the context of a wireless communication system. Various aspects of the present disclosure are further illustrated and described with reference to apparatus diagrams, system diagrams, and flow diagrams related to managing DRX for sidelink communication to select a relay device in a wireless communication system.

[0087] Figure 1 An example of a wireless communication system 100 according to one or more aspects of the present disclosure is illustrated. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be an LTE network, an advanced LTE (LTE-A) network, an LTE-A Pro network, or an NR network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

[0088] The base stations 105 may be dispersed throughout a geographic area to form the wireless communication system 100, and may be devices of different forms or with different capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base stations 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which the base stations 105 and the UEs 115 may support communication of signals according to one or more radio access technologies.

[0089] The UEs 115 may be dispersed throughout the coverage area of ​​the wireless communication system 100, and each UE 115 may be stationary, mobile, or stationary or mobile at different times. The UEs 115 may be devices of different forms or with different capabilities. Figure 1 Some example UEs 115 are described in the accompanying drawings. The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115, base stations 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), such as Figure 1 shown.

[0090] The base stations 105 may communicate with the core network 130, with each other, or both. For example, the base stations 105 may interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3 or other interfaces). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130) or both via the backhaul links 120 (e.g., via X2, Xn or other interfaces). In some examples, the backhaul links 120 may be or include one or more wireless links. The UE 115 may communicate with the core network 130 via a communication link 155. One or more of the base stations 105 described herein may include or may be referred to by a person of ordinary skill in the art as a base transceiver, a radio base station, an access point, a radio transceiver, a node B, an eNodeB (eNB), a next generation node B or a gigabit node B (any of which may be referred to as a gNB), a home node B, a home eNodeB or other suitable terms.

[0091] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where a "device" may also be referred to as a unit, a station, a terminal, or a client, among other examples. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, among other examples, which may be implemented in various objects such as appliances, or vehicles, meters, and among other examples. The UE 115 described herein may be able to communicate with various types of devices, such as other UEs 115 that may sometimes act as repeaters, as well as base stations 105 and network devices, including, for example, Figure 1 Macro eNB or gNB, small cell eNB or gNB, or relay base station shown, among other examples.

[0092] The UE 115 and the base station 105 can communicate with each other wirelessly via one or more communication links 125 on one or more carriers. The term "carrier" may refer to a collection of radio frequency spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth portion (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling to coordinate operations for the carrier, user data, or other signaling. The wireless communication system 100 may use carrier aggregation or multi-carrier operation to support communication with the UE 115. The UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to the carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0093] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be positioned according to a channel grid for discovery by a UE 115. A carrier may operate in a standalone mode, where a UE 115 may perform initial acquisition and connection via a carrier, or a carrier may operate in a non-standalone mode, where a different carrier (e.g., of the same or different radio access technology) is used to anchor a connection.

[0094] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. A carrier may carry downlink or uplink communications (e.g., in FDD mode), or may be configured to carry both downlink and uplink communications (e.g., in TDD mode).

[0095] A carrier may be associated with a particular bandwidth of a radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of a plurality of determined bandwidths of a carrier of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). A device of the wireless communication system 100 (e.g., a base station 105, a UE 115, or both) may have a hardware configuration that supports communications on a particular carrier bandwidth, or may be configured to support communications on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or a UE 115 that supports simultaneous communications via carriers associated with a plurality of carrier bandwidths. In some examples, each served UE 115 may be configured to operate on a portion (e.g., a subband, a BWP) or all of the carrier bandwidth.

[0096] The signal waveform transmitted on the carrier may be composed of multiple subcarriers (e.g., using multicarrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource unit may be composed of a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource unit may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource units received by UE 115 and the higher the order of the modulation scheme, the higher the data rate of UE 115 may be. Wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may also increase the data rate or data integrity used to communicate with UE 115.

[0097] One or more digital schemes for a carrier may be supported, where the digital scheme may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier may be divided into one or more BWPs with the same or different digital schemes. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time, and communications for a UE 115 may be limited to one or more active BWPs.

[0098] The time interval of the base station 105 or the UE 115 may be expressed as a multiple of a basic time unit, which may be referred to as T s =1 / (Δf max .N f ) seconds sampling period, where Δf maxIt can represent the maximum supported subcarrier spacing, and N f The maximum supported discrete Fourier transform (DFT) size may be indicated. The time intervals of the communication resources may be organized according to radio frames, each radio frame having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0099] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, the frame may be divided into (e.g., in the time domain) subframes, and each subframe may be further divided into multiple time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include multiple symbol periods (e.g., depending on the length of the cyclic prefix preceding each symbol period). In some wireless communication systems 100, the time slot may be further divided into multiple micro-time slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0100] A subframe, slot, mini-slot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI)).

[0101] Physical channels may be multiplexed on a carrier according to various techniques. For example, physical control channels and physical data channels may be multiplexed on a downlink carrier using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by the number of symbol periods and may extend across a system bandwidth of a carrier or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a set of UEs 115. For example, one or more UEs 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates of one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to a plurality of control channel resources (e.g., control channel elements (CCEs)) associated with coding information for a control information format having a given payload size. The search space sets may include a common search space set configured to transmit control information to multiple UEs 115 and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0102] Each base station 105 can provide communication coverage via one or more cells (e.g., macro cells, small cells, hot spots, or other types of cells, or any combination thereof). The term "cell" refers to a logical communication entity used to communicate with the base station 105 (e.g., via a carrier), and can be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID), or other) used to distinguish adjacent cells. In some examples, a cell may also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) on which the logical communication entity operates. Such cells can range from smaller areas (e.g., structures, subsets of structures) to larger areas, depending on various factors (e.g., the capabilities of the base station 105). For example, a cell may be or include a building, a subset of a building, or an external space between or overlapping geographic coverage areas 110, as well as other examples.

[0103] A macro cell covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access to UE 115 with a service subscription to a network provider that supports the macro cell. Compared to a macro cell, a small cell may be associated with a low-power base station 105, and the small cell may operate in the same or different (e.g., licensed, unlicensed) frequency band as the macro cell. A small cell may provide unrestricted access to a UE 115 with a service subscription to a network provider, or may provide restricted access to a UE 115 associated with a small cell (e.g., a UE 115 in a closed subscriber group (CSG), a UE 115 associated with a user in a home or office). A base station 105 may support one or more cells, and may also use one or more component carriers to support communications on one or more cells. In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)) that may provide access rights to different types of devices.

[0104] In some examples, base stations 105 may be mobile and thus provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

[0105] The wireless communication system 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations 105 may have similar frame timing, and transmissions from different base stations 105 may be approximately aligned in time. For asynchronous operation, the base stations 105 may have different frame timing, and transmissions from different base stations 105 may not be aligned in time in some examples. The techniques described herein may be used for synchronous operation or asynchronous operation.

[0106] Some UEs 115 (such as MTC or IoT devices) may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters for measuring or capturing information and relaying the information to a central server or application, which may utilize the information or present the information to a person interacting with the program application. Some UEs 115 may be designed to collect information or implement automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, medical monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.

[0107] Some UEs 115 may be configured to employ a reduced power consumption operating mode, such as half-duplex communication (e.g., a mode that supports one-way communication via transmission or reception, but not simultaneously). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for UEs 115 include entering a power saving deep sleep mode when not engaged in active communications, operating over a limited bandwidth (e.g., according to narrowband communications), or a combination of these techniques. For example, some UEs 115 may be configured to operate using a narrowband protocol type associated with a defined portion or range (e.g., a subcarrier or resource block (RB) set) within a carrier, within a guard band of a carrier, or outside a carrier.

[0108] The wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication or various combinations thereof. For example, the wireless communication system 100 can be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. UE115 can be designed to support ultra-reliable, low-latency or critical functions (e.g., mission-critical functions). Ultra-reliable communication can include private communication or group communication, and can be supported by one or more mission-critical services (e.g., mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData)). Support for mission-critical functions can include service priorities, and mission-critical services can be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency can be used interchangeably in this article.

[0109] In some examples, the UE 115 is also able to communicate directly with other UEs 115 via a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication may be within the geographic coverage area 110 of the base station 105. Other UEs 115 in such a group may be located outside the geographic coverage area 110 of the base station 105, or may otherwise be unable to receive transmissions from the base station 105. In some examples, a group of UEs 115 communicating via D2D communication may use a 1-to-many (1:M) system in which each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, the D2D communication is performed between the UEs 115 without the involvement of the base station 105.

[0110] The D2D communication link 135 can be an example of a communication channel (e.g., a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, vehicles can communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these. Vehicles can signal information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, vehicles in a V2X system can communicate with roadside infrastructure (e.g., roadside units), or communicate with a network via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communication, or communicate with both.

[0111] UE 115 may operate in DRX mode. In some examples, UE 115 may operate in DRX mode based at least in part on a DRX configuration. The DRX configuration may define one or more DRX parameters, such as an active duration of a DRX cycle, an inactive duration of a DRX cycle, a DRX cycle, a periodicity of a DRX cycle, an offset period associated with an active duration of a DRX cycle, a DRX inactivity timer, a DRX active timer, a DRX retransmission timer, and the like. The DRX cycle may include an active duration of the DRX cycle, and the inactive duration of the DRX cycle may be defined by a time unit of a time slot or a millisecond (ms).

[0112] In some examples, the DRX configuration may be per MAC entity. In some other examples, the DRX configuration may be per frequency range (FR). For example, a DRX configuration may be defined for FR1, which may refer to a frequency range between approximately 450 MHz and approximately 7.125 GHz, or for FR2, which may refer to a frequency range between approximately 24.25 GHz and approximately 52.6 GHz. UE 115 may also be configured with a DRX configuration based on providing a preferred C-DRX configuration in UE assistance information (UAI), the preferred C-DRX configuration including a long DRX cycle, a short DRX cycle, a DRX inactivity timer, a short DRX cycle timer, and the like. In some examples, UE 115 may not operate in DRX mode (e.g., DRX mode is disabled) and in order to experience power savings, UE 115 may wake up based on a wake-up signal received from base station 105.

[0113] UE 115 may include a UE communication manager 101 that may provide high reliability and low latency wireless communications by supporting sidelink DRX operations for relay discovery, selection, and reselection as described herein. UE communication manager 101 may be Figures 8 to 11 Similarly, the base station 105 may include a base station communication manager 102, which may provide a sidelink DRX configuration as described herein. The base station communication manager 102 may be as described herein. Figures 12 to 15 Examples of aspects of a base station communications manager are described.

[0114] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connection, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) for managing access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) for routing packets or interconnections to an external network. The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for UE 115 served by a base station 105 associated with the core network 130. User IP packets may be transmitted through a user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to a network operator IP service 150. The operator IP service 150 may include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or a packet-switched streaming service.

[0115] Some network devices (e.g., base station 105) may include subcomponents (e.g., access network entity 140), which may be examples of access node controllers (ANCs). Each access network entity 140 may communicate with UE 115 through one or more other access network transport entities 145, which may be referred to as radio heads, smart radio heads, or transmit / receive points (TRPs). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or merged into a single network device (e.g., base station 105).

[0116] The wireless communication system 100 may operate using one or more frequency bands ranging from 300 megahertz (MHz) to 300 gigahertz (GHz). The region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, yet the waves may penetrate structures sufficiently for a macro cell to provide service to a UE 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and a shorter range (e.g., less than 100 kilometers) than transmission of lower frequencies and longer waves using the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0117] The wireless communication system 100 may also operate in a super high frequency (SHF) region using a frequency band from 3 GHz to 30 GHz (also referred to as a centimeter band), or in an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz), which is also referred to as a millimeter band. In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between UE 115 and base station 105, and the EHF antennas of each device may be smaller and more closely spaced than UHF antennas. In some examples, this may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may suffer from greater atmospheric attenuation and a shorter range than SHF or UHF transmissions. The technology disclosed herein may be applied across transmissions using one or more different frequency regions, and the designated use of frequency bands across these frequency regions may vary from country to country or administrative body.

[0118] The wireless communication system 100 can utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 can employ license assisted access (LAA) or LTE unlicensed (LTE-U) radio access technology or NR technology in an unlicensed band such as the 5 GHz industrial, scientific and medical (ISM) band. When operating in an unlicensed radio frequency spectrum band, devices (such as base stations 105 and UEs 115) can employ carrier sensing for conflict detection and avoidance. In some examples, operations in unlicensed bands can be combined with component carriers operating in licensed bands (e.g., LAA) based on carrier aggregation configuration. Operations in unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, as well as other examples.

[0119] The base station 105 or UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly (such as an antenna tower). In some examples, the antennas or antenna arrays associated with the base station 105 may be located at different geographical locations. The base station 105 may have an antenna array having multiple rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals sent via the antenna ports.

[0120] The base station 105 or UE 115 can use MIMO communication to utilize multipath signal propagation and increase spectral efficiency by sending or receiving multiple signals via different spatial layers. Such a technology may be referred to as spatial multiplexing. For example, multiple signals may be sent by a transmitting device via different antennas or different antenna combinations. Similarly, multiple signals may be received by a receiving device via different antennas or different antenna combinations. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO) (where multiple spatial layers are sent to the same receiving device, and multi-user MIMO (MU-MIMO) (where multiple spatial layers are sent to multiple devices).

[0121] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape an antenna beam or to steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array so that some signals propagating in a particular direction relative to the antenna array experience constructive interference while other signals experience destructive interference. Adjustment of signals transmitted via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. The adjustments associated with each of these antenna elements may be defined by a set of beamforming weights associated with a particular direction (e.g., relative to the antenna array of the transmitting device or the receiving device or relative to some other direction).

[0122] The base station 105 or the UE 115 may use beam scanning techniques as part of a beamforming operation. For example, the base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communications with the UE 115. The base station 105 may send some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) multiple times in different directions. For example, the base station 105 may send signals according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used to identify (e.g., by a transmitting device such as the base station 105, or by a receiving device such as the UE 115) the beam direction for later transmission or reception by the base station 105.

[0123] Some signals, such as data signals associated with a particular receiving device, may be sent by base station 105 in a single beam direction (e.g., a direction associated with a receiving device such as UE 115). In some examples, the beam direction associated with transmissions along a single beam direction may be determined based on signals sent in one or more beam directions. For example, UE 115 may receive one or more signals sent by base station 105 in different directions, and UE 115 may report to base station 105 an indication of the signal received by UE 115 with the highest signal quality or another acceptable signal quality.

[0124] In some examples, transmissions by a device (e.g., by a base station 105 or a UE 115) may be performed using multiple beam directions, and the device may generate a combined beam for transmission (e.g., from the base station 105 to the UE 115) using a combination of digital precoding or radio frequency beamforming. The UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. The base station 105 may send a reference signal (e.g., a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS)), which may be precoded or unprecoded. The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-faceted codebook, a linear combination codebook, a port selection codebook). Although these techniques are described with reference to signals sent by base station 105 in one or more directions, UE 115 may employ similar techniques for sending signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by UE 115), or for sending signals in a single direction (e.g., for sending data to a receiving device).

[0125] A receiving device (e.g., UE 115) may try multiple reception configurations (e.g., directional listening) when receiving various signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) from a base station 105. For example, a receiving device may try multiple reception directions by receiving via different antenna subarrays, processing received signals according to different antenna subarrays, receiving according to different sets of receive beamforming weights applied to signals received at multiple sets of antenna elements of an antenna array (e.g., different sets of directional listening weights), or processing received signals according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as "listening" according to different reception configurations or reception directions. In some examples, a receiving device may use a single reception configuration to receive along a single beam direction (e.g., when receiving a data signal). A single receive configuration may be aligned on a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or otherwise acceptable signal quality based on listening according to multiple beam directions).

[0126] The wireless communication system 100 can be a packet-based network operated according to a layered protocol stack. In the user plane, the communication at the bearer or packet data convergence protocol (PDCP) layer can be based on IP. The radio link control (RLC) layer can perform packet segmentation and reorganization to communicate on a logical channel. The medium access control (MAC) layer can perform priority processing and multiplex logical channels into transport channels. The MAC layer can also use error detection technology, error correction technology, or both to support retransmission at the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration and maintenance of the RRC connection between the base station 105 or the core network 130 that supports the radio bearer for user plane data. At the physical layer, the transport channel can be mapped to the physical channel.

[0127] UE 115 and base station 105 can support retransmission of data to increase the possibility of successfully receiving the data. Hybrid automatic repeat request (HARQ) feedback is a technique for increasing the possibility of correctly receiving data through communication link 125. HARQ can include a combination of error detection (e.g., using cyclic redundancy check (CRC)), forward error correction (FEC) and retransmission (e.g., automatic repeat request (ARQ)). HARQ can improve the throughput at the MAC layer under poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, the device can support same-slot HARQ feedback, wherein the device can provide HARQ feedback in a specific time slot for data received in a previous symbol in the time slot. In other cases, the device can provide HARQ feedback in a subsequent time slot or according to some other time interval.

[0128] Figure 2 An example of a wireless communication system 200 according to one or more aspects of the present disclosure is illustrated. The wireless communication system 200 may implement aspects of the wireless communication system 100. For example, the wireless communication system 200 may include a base station 105-a, a UE 115-a, a UE 115-b, a UE 115-c, and a UE 115-d, which may be examples of the base station 105 and the UE 115 described herein. The wireless communication system 200 may support a variety of radio access technologies, including a 4G system such as an LTE system, an LTE-A system, or an LTE-APro system, and a 5G system, which may be referred to as an NR system. The wireless communication system 200 may include features for improving power conservation, and in some examples, may facilitate high reliability and low latency wireless communications and have other benefits.

[0129] The wireless communication system 200 can support sidelink communication between multiple UEs 115 via a sidelink connection (also referred to as a D2D connection). For example, UE 115-a and UE 115-b can perform sidelink communication via a sidelink connection 205-a. UE 115-a can additionally or alternatively perform sidelink communication via a sidelink connection 205-b with UE 115-c or via a sidelink connection 205-c with UE 115-d. Similarly, UE 115-c and UE 115-d can perform sidelink communication via a sidelink connection 205-d. Sidelink connection 205 can correspond to a PC5 interface, which can facilitate sidelink communication between at least two UEs 115 without involving a base station 105-a. The PC5 interface can also be a one-to-many communication interface (e.g., can be designated for group communication).

[0130] exist Figure 2 In the example of , UE 115 can communicate directly with base station 105-a or can communicate indirectly with base station 105-a. For example, UE 115-a can communicate directly with base station 105-a via cellular connection 210, which can correspond to a Uu interface. The Uu interface can refer to an air interface for downlink transmission, uplink transmission, or both. UE 115-b can communicate indirectly with base station 105-a via UE 115-a (also referred to as relay UE 115-a). For example, UE 115-b and base station 105-a may not be able to communicate directly because UE 115-b may be outside the coverage of base station 105-a, and therefore a relay UE is required to relay communications (e.g., control and / or data services) between UE 115-b and base station 105-a.

[0131] The relay UE 115-a can be configured by the base station 105-a for relay service, and if configured, the relay UE 115-a can be equipped with a configuration to control relay operation. To enable such network control, the relay UE 115-a can indicate relay capabilities to the base station 105-a during a connection process (e.g., an attachment process). For example, the relay UE 115-a can indicate a resource request for providing relay services, and the base station 105-a can configure the requested resources for the relay UE 115-a. The base station 105-a can control relay services by configuring the relay UE 115-a with the conditions for when to provide relay services to other UEs 115 in the wireless communication system 200.

[0132] The base station 105-a can configure thresholds, such as reference signal received power (RSRP) thresholds, received signal received quality (RSRQ) thresholds, etc. The relay UE 115-a can provide relay services (e.g., serve as a relay node in the wireless communication system 200) based on the RSRP or RSRQ or both of the serving cell (e.g., the base station 105-a that satisfies the RSRP threshold or the RSRQ threshold or both). In other words, if the RSRP or RSRQ or both associated with the cellular connection 210 (e.g., the Uu link) satisfies the RSRP threshold or the RSRQ threshold or both, the relay UE 115-a can provide relay services. Otherwise, the base station 105-a can prevent the UE 115-a from serving as a relay node in the wireless communication system 200 (e.g., providing relay services).

[0133] The wireless communication system 200 may also provide other conditions for supporting relay discovery and selection using sidelink communication. For example, in the wireless communication system 200, the UE 115 may support relay discovery, selection and reselection or a combination thereof using sidelink communication when operating in a standalone mode to implement UE-to-network and UE-to-UE relay based on the sidelink. The wireless communication system 200 may provide relay UE and remote UE authorization. In some examples, the relay UE 115-a may provide relay services (e.g., used as a relay node in the wireless communication system 200) based on the QoS associated with the data service between the base station 105-a and the relay UE 115-a meeting the quality of service (QoS) threshold. In the wireless communication system 200, the UE 115 may provide relay services based on service continuity, the security of the relay connection (e.g., the sidelink connection 205-a and / or the cellular connection 210), or the impact on the user plane protocol stack and the control plane process (e.g., the connection management of the relayed connection).

[0134] The UE 115 supporting sidelink communication can use the protocol stack described herein to provide sidelink communication. The remote UE 115-b can generate data services to be sent to the relay UE 115-a. The user data service can be packaged into IP packets at the IP layer. The IP packets are then passed down to the access layer (AS) layer. The functional description of the AS layer for sidelink communication is as follows. The packet data convergence protocol (PDCP) layer of the AS layer can support header compression of received IP service data units to reduce the size of the IP packet header of the IP packet. The PDCP layer can establish a sidelink radio bearer (SLRB) to carry data services through a sidelink (e.g., a sidelink connection 205-a between a remote UE 115-b and a relay UE 115-a). The RLC layer can be an unacknowledged mode (UM) radio link control (RLC) supported for sidelink communication. UM RLC support for sidelink communication can rely on delay-sensitive and fault-tolerant services.

[0135] The MAC layer of the AS layer can perform logical channel prioritization by considering the priority of each sidelink logical channel corresponding to the SLRB. The MAC header may include source ID and destination ID fields. The MAC layer at the relay UE 115-a may use the destination ID for packet filtering. Each MAC protocol data unit may have one new transmission and up to three retransmissions, so that the relay UE 115-a can perform HARQ combining. The physical (PHY) layer of the AS layer may provide data transmission involving the transmission of a physical control channel and a physical data channel carrying sidelink control information (SCI). For each new transmission, the remote UE 115-b may send an SCI indicating a layer 1 destination ID, a modulation and coding scheme (MCS), and the time-frequency position of the data service. The remote UE 115-b may then send data services on the physical data channel that follows the control channel.

[0136] A UE 115 that is out of coverage may be referred to herein as a remote UE 115. Figure 2In the example of , UE 115-b may be referred to as remote UE 115-b. Remote UE 115-b may discover relay UE 115-a based on discovery messages broadcast from remote UE 115-b or discovery messages received from relay UE 115-a. These messages may include certain information (e.g., synchronization information, service information, etc.) that may be used by remote UE 115-b or relay UE 115-a or both to establish a sidelink connection 205-a for relaying transmissions to and from base station 105-a (e.g., for sending and receiving information related to services provided by base station 105-a). As described herein, a relay UE may be in connected mode. That is, the relay UE may have a connection to a network (e.g., base station 105-a). A remote UE as described herein may operate in connected mode, idle mode, inactive mode, or out-of-coverage mode, or any combination thereof. Therefore, sidelink DRX for remote UEs 115-b may have to be synchronized between all remote UEs 115 and relay UEs 115. Relay UEs 115 may always be connected and therefore synchronized with base station 105-a.

[0137] The remote UE 115-b may not initially be connected to any relay UE in the wireless communication system 200 (e.g., no PC5 unicast link is established between the remote UE 115-b and the relay UE 115-a). The remote UE 115-b may identify the presence of at least one suitable relay UE 115 to request relay service in its vicinity based on the discovery message. To enable identification, the relay UE 115-a may announce its presence by periodically sending a sidelink discovery message, and / or the remote UE 115-b may announce a sidelink discovery request message, expecting, for example, a nearby relay UE 115-a to respond. Therefore, for relay selection, the remote UE 115-b may not be connected to any relay UE. The remote UE 115-b may discover all relay UEs in the wireless communication system 200 that have sidelink RSRP, RSRQ, QoS, etc. that meet a threshold. For relay reselection, the remote UE 115-b may be connected to at least one relay UE (e.g., relay UE 115-a). When the sidelink RSRP, RSRQ, QoS, etc. do not meet the threshold, the remote UE 115-b can find other relay UEs that meet the threshold. For example, the remote UE can find multiple candidate relay UEs and select one relay UE with the highest sidelink RSRP, RSRQ, QoS, etc.

[0138] A remote UE 115-b seeking to discover a relay UE (e.g., a relay UE 115-a acting as a repeater) may, in some cases, consume considerable power when monitoring discovery messages. The relay UE 115-a may also consume considerable power when sending discovery messages. As a result, the battery life of the relay UE 115-a and the remote UE 115-b may be affected, which may also affect the reliability and latency of receiving service-related information at the remote UE 115-b. In other words, in the absence of sidelink DRX operation, the relay UE 115-a and the remote UE 115-b may keep their receivers and / or transmitters continuously active to monitor and receive relay discovery messages or send relay discovery request messages in the wireless communication system 200. Various aspects of the described technology involve configuring a remote UE 115-b to operate in a power save mode (also known as a DRX mode) to reduce its power consumption when discovering and selecting a relay UE 115 as a repeater between the remote UE 115-b and a base station 105-a or other device in the wireless communication system 200.

[0139] When in DRX mode, the remote UE 115-b may power on appropriate circuits for a period of time (e.g., the active duration of the DRX cycle) to monitor the wireless channel for discovery messages from other UEs 115. After the period has elapsed, the remote UE 115-b may power off for a period of time (e.g., the inactive duration of the DRX cycle). The DRX mode, which includes periods for powering on and off, may be specific to when the remote UE 115-b monitors for discovery messages. Once the remote UE 115-b detects a candidate relay UE (e.g., relay UE 115-a) based on the discovery message, the remote UE 115-b may select the candidate relay UE as a relay based on whether the sidelink quality meets a threshold as described herein or whether the candidate relay can provide the connection service requested by the remote UE 115-a.

[0140] The remote UE 115-b can evaluate the former condition by performing measurements on the discovery message received from the candidate relay UE 115-a, and it checks the latter condition by referring to the field (e.g., relay service code) included in the discovery message provided by the candidate relay UE 115-a. The period associated with the DRX mode can be configured and provided by the base station 105-a based on the information provided by the remote UE 115-b. In some cases, the remote UE 115-b can belong to a group of UEs 115, which can share the sidelink configuration (e.g., sidelink DRX information) for the DRX mode. The group of UEs 115 can include remote UEs 115-b, UEs 115-c, and UEs 115-d. In order to avoid interference between the UEs 115 in the group, each UE 115 can have an offset period for when to power on and off as indicated in the sidelink DRX configuration described herein.

[0141] The sidelink DRX configuration may be applicable to broadcast communications, multicast communications, and unicast communications. The sidelink DRX configuration may define an active duration and an inactive duration of a DRX cycle. In some examples, the sidelink DRX configuration may provide a mechanism for aligning the sidelink DRX active duration between mutually communicating UEs 115. In some other examples, the sidelink DRX configuration may provide a mechanism for aligning the sidelink DRX active duration with the Uu DRX active duration of the UE 115 within coverage.

[0142] The remote UE 115-b may report its sidelink DRX preference to the base station 105-a when in connected mode. For example, the remote 115-b may sometimes be within the coverage of the base station 105-a and may report the sidelink DRX preference to the base station 105-a. The base station 105-a may configure the remote UE 115-b with a sidelink DRX configuration, which may be a UE-specific C-DRX configuration for both cellular reception (e.g., Uu reception) and relay discovery message monitoring. Alternatively, the remote UE 115-b may support a remote UE group common sidelink DRX configuration when in idle mode, inactive mode, out of coverage mode, or any combination thereof. The remote UE group common sidelink DRX configuration may be broadcast in a system information block (SIB) and a pre-configuration message (e.g., an RRC pre-configuration message).

[0143] Once the remote UE 115-b detects a relay UE candidate (e.g., relay UE 115-a), it selects relay UE 115-a based on satisfying one or more criteria. For example, the remote UE 115-b may select relay UE 115-a for relay service based on the sidelink quality of the sidelink connection 205-a satisfying a threshold. Additionally or alternatively, the remote UE 115-b may select relay UE 115-a for relay service based on the relay UE 115-a supporting the relay or connection service requested by the remote UE 115-b. The remote UE 115-b may evaluate one or both of these criteria. During relay discovery, the remote UE 115-b may obtain the UE identifier (ID) of the relay UE 115-a for sidelink transmission and reception of relay data services.

[0144] In some examples, if DRX is configured, the relay UE 115-a may send a sidelink broadcast channel (SL-BCH) for synchronizing the remote UE 115-b. Synchronization for sidelink communications may include the relay UE 115-a sending synchronization information to the remote UE 115-b via the sidelink connection 205-a, and then the remote UE 115-b becomes synchronized. The synchronization information may include a physical synchronization signal (also referred to as a sidelink synchronization signal) and an RRC message (also referred to as a master information block (MIB) sidelink). For sidelink communications including sidelink synchronization signals, the relay UE 115-a within the coverage area uses network synchronization associated with uplink / downlink synchronization. If the remote UE 115-b out of coverage detects appropriate synchronization information sent by the relay UE 115-a, the remote UE 115-b may use the detected synchronization information.

[0145] The remote UE 115-b may selectively (e.g., conditionally) enable or disable a sidelink DRX mode or sidelink DRX configuration. In some examples, if configured in a SIB or RRC preconfiguration message, the remote UE 115-b may enable the sidelink DRX by default. In some other examples, the remote UE 115-b may enable the sidelink DRX by default at least in part based on the QoS of pending data services at the remote UE 115-b. For example, if the minimum QoS of all pending data services is above a QoS threshold, the remote UE 115-b may enable the sidelink DRX. Otherwise, the remote UE 115-b may disable the sidelink DRX. Therefore, when the remote UE 115-b has an urgent data service, it is allowed to monitor all discovery messages to reduce the delay caused by relay selection. In other examples, the remote UE 115-b may enable the sidelink DRX based on the battery status (e.g., battery charge, battery percentage) of the remote UE 115-b. Thus, if the battery of the remote UE 115-b is below a battery threshold, the remote UE 115-b may enable sidelink DRX.

[0146] The relay UE 115-a can relay traffic between the sidelink connection 205-a (e.g., PC5 interface) and the cellular connection 210 (e.g., Uu interface) by performing traffic mapping. For example, the relay UE 115-a can map uplink / downlink bearers to sidelink bearers and vice versa, and the mapping can be used for correct packet routing and quality of service (QoS) processing. For sidelink to uplink mapping that occurs when the relay UE 115-a receives traffic from the remote UE 115-b via the sidelink connection 205-a, the relay UE 115-a uses an uplink traffic flow template to select an uplink bearer to carry the received traffic via the uplink. For downlink to sidelink mapping that occurs when the relay UE 115-a receives traffic from the base station 105-a via the cellular connection 210, it identifies whether the packet must be relayed by referring to the destination address of the packet. The relay UE 115 - a then assigns a priority value, also referred to as a Per-Packet ProSe Priority (PPPP), to the received packets to be relayed.

[0147] Priority assignment can be based on mapping information representing an association between a QoS class identifier (QCI) value of a downlink bearer and a priority value. The QCI to priority mapping information can be provided by the base station 105-a to the relay UE 115-a. In some examples, the relay UE 115-a can allocate its discovery message transmission by applying a random resource transmission pool selection (e.g., Mode 2), or the base station 105-a can allocate scheduling (e.g., model) within the DRX common activity duration. This can avoid relay UEs 115 with the same relay service code being awakened at the same time. The relay UE 115-a can therefore send more frequent discovery messages based on its relay capabilities (e.g., supporting high QoS bearers with the base station 105-a and / or remote UE 115-b).

[0148] The data service can be a unicast service or a multicast service. When the relay UE 115-a provides relay service for the unicast service, it establishes a one-to-one sidelink connection with the remote UE 115-a. The PC5 signaling protocol is introduced to provide direct connection management functions, such as direct link establishment / release, security parameter control, and IP address allocation. In addition, the protocol can support processing requests from the remote UE 115-b for multicast service relay. When the sidelink connection is established, an IP address can be allocated to the remote UE 115-b for relaying services. Once the relay UE 115-a establishes a sidelink connection 205-a with the remote UE 115-b, it reports information about the context of the remote UE 115-b to the base station 105-a, such as the EPS bearer ID used for relaying, the remote UE ID, and optionally, the IP address. The remote UE 115-a context is forwarded to the base station 105-a, which uses the information for traffic management, including mapping relay traffic to EPS bearers for relaying.

[0149] Figure 3 An example of a process flow 300 according to one or more aspects of the present disclosure is illustrated. The process flow 300 may be implemented by reference to Figure 1 and Figure 2 Aspects of the wireless communication systems 100 and 200 described herein. The process flow 300 may be based on the configuration of the base station 105-b or the UE 115-e and implemented by the UE 115-e and may facilitate power conservation for the UE 115-e by supporting sidelink DRX operation. The process flow 300 may also be based on the configuration of the base station 105-b or the UE 115-e and implemented by the UE 115-e to facilitate high reliability and low latency wireless communications by relaying wireless communications using sidelink communications, among other benefits.

[0150] Base station 105-b and UE 115-e may be examples of base station 105 and UE 115, as shown in FIG. Figure 1 and Figure 2 In the following description of process flow 300, operations between base station 105-b and UE 115-e may be sent in a different order than the example order shown, or operations performed by base station 105-b and UE 115-e may be performed in a different order or at a different time. Some operations of process flow 300 may also be omitted, and other operations may be added to process flow 300.

[0151] exist Figure 3 In the example of , UE 115-e can operate in connected mode. That is, UE 115-b can initially have a direct connection with base station 105-b (e.g., via a Uu interface). Figure 3 In the example of , UE 115-e may initially be not connected to a relay node (e.g., a relay UE) in the wireless communication system. However, later on UE 115-e may be out of coverage of base station 105-b and may continue wireless communication with base station 105-b using a relay UE as described herein. Various aspects of process flow 300 involve configuring UE 115-e to operate in a power save mode (also referred to as a sidelink DRX mode or C-DRX mode) to reduce its power consumption while monitoring the wireless communication system to discover and select a relay UE to serve as a relay between UE 115-e and base station 105-b.

[0152] At 305, the UE 115-e may send sidelink DRX information to the base station 105-b, for example, via a Uu interface. The UE 115-e may send the sidelink DRX information in UE Assistance Information (UAI). The sidelink DRX information may indicate a DRX preference, which may include a DRX cycle, an active duration of the DRX cycle, an offset period before the active duration of the DRX cycle, a DRX inactivity timer, a DRX retransmission timer, etc. The UE 115-b may thereby report its preference for sidelink DRX operation to the base station 105-b via the sidelink DRX information. The UE 115-e may determine the DRX preference based at least in part on a relay service or QoS requirement, or both, for pending data traffic at the UE 115-e.

[0153] At 310, the base station 105-b may determine a sidelink DRX configuration, for example, based on sidelink DRX information received from the UE 115-e. The sidelink DRX configuration may define a DRX mode including an active duration of a DRX cycle and an inactive duration of a DRX cycle. The base station 105-b may configure a UE-specific DRX mode for the UE 115-e via a Uu RRC message. That is, the base station 105-b may configure a single DRX mode for the UE 115-b for both cellular communication (e.g., Uu reception / transmission) and relay discovery monitoring and selection (e.g., via a PC5 interface). In some examples, the base station 105-b may determine the sidelink DRX configuration or adjust the sidelink DRX configuration via an RRC message to modify the sidelink DRX configuration. Because base station 105-a may be aware of the discovery resource pool configuration of UE 115-e, it can modify or configure the sidelink DRX configuration (e.g., C-DRX) to account for the overlap with the discovery resource pool configuration during the DRX cycle (e.g., C-DRX ON period).

[0154] At 315, the base station 105-b may send an RRC reconfiguration message including the sidelink DRX configuration to the UE 115-e. At 320, the UE 115-e may send an RRC reconfiguration complete message to the base station 105-e. Additionally or alternatively, in some examples, the base station 105-b may determine multiple DRX modes (e.g., multiple C-DRX modes) for the UE 115-e. One DRX mode may be used for Uu reception, while another DRX mode may be used for relay discovery monitoring. The base station 105-b may send multiple DRX modes in a single RRC reconfiguration message or in separate RRC reconfiguration messages.

[0155] Figure 4 An example of a timeline 400 according to one or more aspects of the present disclosure is illustrated. The timeline 400 may be implemented with reference to Figure 1 and Figure 2 The timeline 400 may be based on the configuration of the base station 105 or the UE 115 and implemented by the UE 115 to reduce power consumption of the UE 115 by supporting sidelink DRX operation. The timeline 400 may also be based on the configuration of the base station 105 or the UE 115 and implemented by the UE 115 to facilitate high reliability and low latency wireless communications in a wireless communication system, as well as other benefits.

[0156] Referring to timeline 400, a relay UE 115-f or a remote UE 115-g or both as described herein may operate according to a sidelink DRX configuration. The sidelink DRX configuration may define a DRX cycle 405, which may include an active DRX duration 410 and an inactive DRX duration 415. During the active DRX duration 410, the relay UE 115-f may broadcast one or more discovery messages 420 over a sidelink channel. The remote UE 115-g may monitor a discovery resource pool 425 for the one or more broadcast discovery messages 420 during the active DRX duration 410.

[0157] The resource pool may be a receive resource pool or a transmit resource pool, or a combination thereof. These may be signaled by the base station 105 for situations within the coverage area, or pre-configured for situations outside the coverage area. Figure 4 In the example of , the discovery resource pool 425 can be a receiving resource pool. The discovery resource pool 425 can be a set of time and frequency resources allocated to the remote UE 115-g for sidelink operations, and more specifically for monitoring the discovery message 420.

[0158] The relay UE 115-f may also support cellular communications (e.g., via the Uu interface) during the inactive DRX duration 415 of the DRX cycle 405. For example, the relay UE 115-f may support cellular (Uu interface) transmission and reception (e.g., uplink / downlink messages 430) to and from the base station 105 via the Uu interface. Figure 4 As illustrated, the remote UE 115-g may not perform any operations (e.g., monitoring a channel for discovery messages, etc.) during the inactive DRX duration 415 of the DRX cycle 405. The remote UE 115-g may thus experience additional power savings for relay discovery monitoring by disabling monitoring for one or more discovery messages 420 during the inactive DRX duration 415 of the DRX cycle 405.

[0159] Figure 5 An example of a timeline 500 according to one or more aspects of the present disclosure is illustrated. The timeline 500 may be implemented with reference to Figure 1 and Figure 2 The timeline 500 may be based on the configuration of the base station 105 or the UE 115 and implemented by the UE 115 to reduce power consumption of the UE 115 by supporting sidelink DRX operation. The timeline 500 may also be based on the configuration of the base station 105 or the UE 115 and implemented by the UE 115 to facilitate high reliability and low latency wireless communications in a wireless communication system, among other benefits.

[0160] Referring to timeline 500, one or more remote UEs 115 may receive a common sidelink DRX configuration in a system information message (e.g., SIB) or an RRC message (e.g., an RRC reconfiguration message). For example, the base station 105 may broadcast a system information message (e.g., SIB) or an RRC message (e.g., an RRC reconfiguration message) to one or more remote UEs 115. One or more remote UEs 115 may not have a PC5 unicast link with an established relay UE, and one or more remote UEs 115 may operate in an idle mode, an inactive mode, or an out-of-coverage mode, or a combination thereof. In this way, one or more remote UEs 115 may be configured with a common sidelink DRX configuration to save power when monitoring discovery messages from candidate relay UEs.

[0161] For example, as described herein, remote UE 115-h and remote UE 115-i may operate according to a common sidelink DRX configuration. Remote UE 115-h and remote UE 115-i may be grouped into the same UE group based at least in part on a path loss parameter from each of remote UE 115-h and remote UE 115-i to base station 105 or a QoS of pending data traffic of each of remote UE 115-h and remote UE 115-i or both. The common sidelink DRX configuration may define a DRX cycle 505, which may include an active DRX duration 510 and an inactive DRX duration 515. DRX cycle 505 may be a common DRX cycle for remote UE 115-h and remote UE 115-i. Therefore, active DRX duration 510 may be a common active DRX duration for remote UE 115-h and remote UE 115-i. Likewise, the inactive DRX duration 515 may be a common inactive DRX duration for the remote UE 115 - h and the remote UE 115 - i.

[0162] Alternatively, as described herein, remote UE 115-j may operate according to a common sidelink DRX configuration that is different from the common sidelink DRX configuration associated with remote UE 115-h and remote UE 115-i. The common sidelink DRX configuration may define a DRX cycle 520, which may include an active DRX duration 525 and an inactive DRX duration 530. In order to avoid interference between different UE 115 groups, the common sidelink DRX configuration may include different group common DRX cycles, different group common active DRX durations, different group common DRX offset periods, different monitoring durations (e.g., the duration length may be group common, but without an offset), and the like. That is, remote UEs 115 belonging to different UE groups may perform operations (e.g., monitor a sidelink channel for discovery messages) based on different sidelink DRX configurations.

[0163] exist Figure 5 In the example of FIG. 5 , the active DRX duration 510 associated with the DRX cycle 505 may start at t n , and the active DRX duration 525 associated with the DRX cycle 520 may start at t n However, the active DRX duration 510 may end at t n+2 , and the active DRX duration 525 ends at t n+1 The inactive DRX duration 515 associated with the DRX cycle 505 may start at t n+2 , and the inactive DRX duration 530 associated with the DRX cycle 520 may start at t n+1 .exist Figure 5 In the example of FIG. 5 , the inactive DRX duration 515 associated with the DRX cycle 505 and the inactive DRX duration 530 associated with the DRX cycle 520 may both end at t n+3 The active DRX duration and the inactive DRX duration may therefore have different lengths for different sidelink DRX configurations to avoid interference, as well as to provide an opportunity for the remote UE 115 to monitor for discovery messages. In addition, the remote UE 115 may experience additional power savings for relay discovery monitoring by disabling monitoring for discovery messages during the inactive DRX duration of the DRX cycle.

[0164] Figure 6 An example of a timeline 600 according to one or more aspects of the present disclosure is illustrated. The timeline 600 may be implemented with reference to Figure 1 and Figure 2Aspects of the wireless communication systems 100 and 200 described herein are described. The timeline 600 may be based on the configuration of the base station 105 or the UE 115 and implemented by the UE 115 to reduce power consumption of the UE 115 by supporting sidelink DRX operation. The timeline 600 may also be based on the configuration of the base station 105 or the UE 115 and implemented by the UE 115 to facilitate high reliability and low latency wireless communications in a wireless communication system, among other benefits.

[0165] With reference to timeline 600, one or more remote UEs 115 may receive a common sidelink DRX configuration in a system information message (e.g., SIB) or an RRC message (e.g., an RRC reconfiguration message). For example, a base station 105 may broadcast a system information message (e.g., SIB) or an RRC message (e.g., an RRC reconfiguration message) to one or more remote UEs 115. Remote UEs 115-1 and 115-m as described herein may operate according to a common sidelink DRX configuration. As described herein, remote UEs 115-1 and 115-m may be grouped into the same UE group at least in part based on one or more parameters (e.g., path loss, QoS of pending data services, etc.). In some examples, as described herein, a public active DRX duration may be configured to overlap with a discovery resource pool that may be configured for one or both of a first model discovery process (e.g., a notification message) or a second model discovery process (e.g., a request and response message).

[0166] The public sidelink DRX configuration may define a DRX cycle 605, which may include an active DRX duration 610 and an inactive DRX duration 615. The DRX cycle 605 may be a public DRX cycle for the remote UE 115-1 and the remote UE 115-m. Therefore, the active DRX duration 610 may be a public active DRX duration for the remote UE 115-1 and the remote UE 115-m. Likewise, the inactive DRX duration 615 may be a public inactive DRX duration for the remote UE 115-1 and the remote UE 115-m. In order to avoid interference between the remote UE 115-1 and the remote UE 115-m belonging to the same group of UEs, the public sidelink DRX configuration may define a monitoring duration for each of the remote UE 115-1 and the remote UE 115-m, and an offset duration for one or both of the remote UE 115-1 and the remote UE 115-m. That is, to avoid waking up at the same time, different UEs 115-1, UE 115-m may have UE-specific DRX monitoring offsets via a random offset or a mapping with a remote UE source L2 ID as input (eg, similar to paging PO calculation).

[0167] The remote UE 115-1 may monitor the sidelink channel for one or more discovery messages 620 from the relay UE 115-k during a monitoring duration 630 of an active DRX duration 610 associated with the DRX cycle 605. The monitoring duration 630 may begin at t n Similarly, the remote UE 115-m may monitor the sidelink channel for one or more discovery messages 620 from the relay UE 115-k during a monitoring duration 635 of the active DRX duration 610 associated with the DRX cycle 605. The monitoring duration 630 may begin at t n+1 and ends at t n+2 , such as when the inactive DRX duration 615 begins. Thus, each of the remote UE 115-1 and the remote UE 115-m may have a portion of the active DRX duration allocated for monitoring discovery messages from the relay UE 115-k. In addition, the monitoring duration 635 may be set to the time interval between t n Cross to t n+1 The remote UE 115 may then perform operations (eg, monitor the sidelink channel for discovery messages) based on the different monitoring durations indicated in the sidelink DRX configuration.

[0168] Remote UE 115-1 can be configured to stop monitoring all receiving resource pools outside of monitoring duration 630. Similarly, remote UE 115-m can be configured to stop monitoring all receiving resource pools outside of monitoring duration 635. If separate discovery and common pools are configured for remote UE 115, remote UE 115-1 can be configured to stop monitoring all receiving resource discovery pools. Similarly, if separate discovery and common pools are configured for remote UE 115, remote UE 115-m can be configured to stop monitoring all receiving resource discovery pools. This can be applicable to the case where UE 115 has another PC5 unicast link setup for normal PC5 operation. One power consumption difference: discovery is multicast and broadcast, and takes maximum transmit power, while public messages can use open-loop and closed-loop power control. Discovery messages can be periodic and UE 115 can adapt to DRX mode, while public messages can be bursty. Based on the indication in the SIB or RRC pre-configuration message, the remote UE 115 - 1 , 115 - m may determine to stop monitoring all receive resource pools, including the receive resource discovery pool outside of the monitoring duration 630 , 635 .

[0169] The relay UE 115-k may also support cellular communications (e.g., via the Uu interface) during the inactive DRX duration 615 of the DRX cycle 605. For example, the relay UE 115-k may support cellular (Uu interface) transmission and reception (e.g., uplink / downlink messages 625) to and from the base station 105 via the Uu interface. Figure 6 As illustrated, the remote UE 115-1, UE 115-m may not perform any operations (e.g., channel monitoring for discovery messages, etc.) during the inactive DRX duration 615 of the DRX cycle 605. The remote UE 115-1, UE 115-m may thereby experience additional power savings for relay discovery monitoring by disabling monitoring for one or more discovery messages 620 during the inactive DRX duration 615 of the DRX cycle 605. The inactive DRX duration 615 of the DRX cycle 605 may also provide power savings for the relay UE 115-k by avoiding sending discovery messages and performing other wireless operations (e.g., uplink / downlink transmission / reception) during the inactive DRX duration 615. That is, the relay UE 115-k may perform discontinuous transmission (i.e., turn off its transmitter) because it is aware of the DRX cycle 605 of the remote UE 115-1, 115-m. In some examples, relay UE 115-k may send some relay discovery messages during the DRX common inactivity duration for remote UEs 115 with pending emergency data traffic. Relay UE 115 may alternatively perform Uu transmission / reception during the DRX common inactivity duration.

[0170] Figure 7 An example of a timeline 700 according to one or more aspects of the present disclosure is illustrated. The timeline 700 may be implemented with reference to Figure 1 and Figure 2 The timeline 700 may be based on the configuration of the base station 105 or the UE 115 and implemented by the UE 115 to reduce power consumption of the UE 115 by supporting sidelink DRX operation. The timeline 700 may also be based on the configuration of the base station 105 or the UE 115 and implemented by the UE 115 to facilitate high reliability and low latency wireless communications in the wireless communication system, as well as other benefits. Figure 7 In the example of , a single UE 115 group may include one or more relay UEs 115 and remote UEs. The UE group may share the same active DRX duration of a DRX cycle. The monitoring window of the remote UE may be the same as the DRX common on duration.

[0171] Referring to timeline 700, a relay UE 115-n, a relay UE 115-o, a relay UE 115-p, or a remote UE 115-q, or any combination thereof, as described herein, may operate according to a sidelink DRX configuration. The sidelink DRX configuration may define a DRX cycle 705, which may include one or more active DRX durations 710 and inactive DRX durations 715. In some examples, during the active DRX duration 710, the relay UE 115-n may broadcast one or more discovery messages 720 over a sidelink channel. In some other examples, during the active DRX duration 710, the relay UE 115-o may broadcast one or more discovery messages 725 over a sidelink channel. In other examples, the relay UE 115-p may broadcast one or more discovery messages 730 over a sidelink channel. One or more of the relay UE 115-n, the relay UE 115-o, and the relay UE 115-p may allocate discovery message transmission by applying random resource transmission pool selection (e.g., Mode 2), or the base station 105 may allocate scheduling (e.g., a model) for discovery message transmission of the relay UE 115. This may avoid relay UEs 115 having the same relay service code being woken up at the same time and causing mutual interference.

[0172] The remote UE 115-q may monitor the discovery resource pools for one or more broadcast discovery messages 720, 725, and 730 during the active DRX duration 410. The resource pools may be receive resource pools or transmit resource pools, or a combination thereof. These may be signaled by the base station 105 for in-coverage situations or pre-configured for out-of-coverage situations. Figure 7 In the example of FIG. 1 , the remote UE 115-q may enable resource pool monitoring 740 during the active DRX duration 710 and disable resource pool monitoring 745 during the inactive DRX duration 715. The discovery resource pool 425 may be a receiving resource pool. Figure 7 The illustrated discovery resource pool may be a set of time and frequency resources allocated to the remote UE 115 - q for sidelink operations, and more specifically for monitoring one or more sidelink channels for one or more discovery messages 720 , 725 , and 730 .

[0173] like Figure 7As illustrated, the remote UE 115-q may not perform any operations (e.g., channel monitoring for discovery messages, etc.) during the inactive DRX duration 715 of the DRX cycle 705. The remote UE 115-q may thereby experience additional power savings for relay discovery monitoring by disabling monitoring for one or more discovery messages 720, 725, and 730 during the inactive DRX duration 715 of the DRX cycle 705. One or more of the relay UE 115-n, the relay UE 115-o, and the relay UE 115-p may also support cellular communications (e.g., via a Uu interface) during the inactive DRX duration 715 of the DRX cycle 705. For example, the relay UE 115-p may support cellular (Uu interface) transmission and reception (e.g., uplink / downlink messages 735) to and from the base station 105 via the Uu interface. One or more of relay UE 115 - n , relay UE 115 - o , and relay UE 115 - p may also experience power savings by avoiding sending discovery messages and performing other wireless operations (eg, uplink / downlink transmission / reception) during the inactive DRX duration 715 .

[0174] Figure 8 A block diagram 800 of a device 805 according to one or more aspects of the present disclosure is shown. The device 805 may be an example of aspects of a UE 115 as described herein. The device 805 may include: a receiver 810, a UE communication manager 815, and a transmitter 820. The device 805 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0175] The receiver 810 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to DRX for sidelink communication in a wireless communication system, etc.). The information may be delivered to other components of the device 805. The receiver 810 may be a reference Fig.11 Examples of various aspects of the transceiver 1120 are described. The receiver 810 may use a single antenna or a collection of antennas.

[0176] The UE communication manager 815 may transmit sidelink DRX information to a base station when operating in a connected mode, receive a message including a sidelink DRX configuration from the base station based on the sidelink DRX information, and operate according to the sidelink DRX configuration.

[0177] The UE communication manager 815 may also, when operating in out-of-coverage mode, idle mode, or inactive mode, receive a message including a group sidelink DRX configuration associated with a group of UEs; determine a time period during which a sidelink channel can be discontinuously monitored based on the group sidelink DRX configuration; and monitor the sidelink channel during the time period.

[0178] The UE communication manager 815 may also determine a DRX cycle based on the sidelink DRX configuration, the DRX cycle including an active duration and an inactive duration; receive a discovery request message from the second UE during the active duration of the DRX cycle; and send a discovery response message to the second UE during the active duration of the DRX cycle. The UE communication manager 815 may be an example of aspects of the UE communication manager 1110 described herein.

[0179] The UE communication manager 815 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the UE communication manager 815 or its subcomponents may be performed by a general purpose processor, a DSP, an application specific integrated circuit (ASIC), an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0180] The UE communication manager 815 or its subcomponents may be physically located at various locations, including being distributed so that part of the functionality is implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the UE communication manager 815 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of the present disclosure, the UE communication manager 815 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in the present disclosure, or combinations thereof.

[0181] The transmitter 820 can transmit signals generated by other components of the device 805. In some examples, the transmitter 820 can be co-located with the receiver 810 in a transceiver module. For example, the transmitter 820 can be a reference Fig.11 Examples of various aspects of the transceiver 1120 are described. The transmitter 820 may use a single antenna or a collection of antennas.

[0182] Fig. 9A block diagram 900 of a device 905 according to one or more aspects of the present disclosure is shown. The device 905 may be an example of aspects of the device 805 or UE 115 as described herein. The device 905 may include: a receiver 910, a UE communication manager 915, and a transmitter 940. The device 905 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0183] The receiver 910 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to DRX for sidelink communication in a wireless communication system, etc.). The information may be delivered to other components of the device 905. The receiver 910 may be a reference Fig.11 Examples of various aspects of the transceiver 1120 are described. The receiver 910 may use a single antenna or a collection of antennas.

[0184] UE communication manager 915 may be an example of aspects of UE communication manager 815 described herein. UE communication manager 915 may include sidelink information component 920, sidelink configuration component 925, mode component 930, and discovery component 935. UE communication manager 915 may be an example of aspects of UE communication manager 1110 described herein.

[0185] The sidelink information component 920 can send sidelink DRX information to the base station when operating in the connected mode. The sidelink configuration component 925 can receive a message including a sidelink DRX configuration from the base station based on the sidelink DRX information. The mode component 930 can operate according to the sidelink DRX configuration.

[0186] The sidelink configuration component 925 can receive a message including a group sidelink DRX configuration associated with a group of UEs when operating in an out-of-coverage mode, an idle mode, or an inactive mode. The mode component 930 can determine a time period for enabling discontinuous monitoring of the sidelink channel based on the group sidelink DRX configuration and monitor the sidelink channel during the time period.

[0187] The sidelink configuration component 925 can determine a DRX cycle based on the sidelink DRX configuration, the DRX cycle comprising an active duration and an inactive duration. The discovery component 935 can receive a discovery request message from the second UE during the active duration of the DRX cycle and send a discovery response message to the second UE during the active duration of the DRX cycle.

[0188] The transmitter 940 can transmit signals generated by other components of the device 905. In some examples, the transmitter 940 can be co-located with the receiver 910 in a transceiver module. For example, the transmitter 940 can be a reference Fig.11 Examples of various aspects of the transceiver 1120 are described. The transmitter 940 may use a single antenna or a collection of antennas.

[0189] Fig.10 A block diagram 1000 of a UE communication manager 1005 is shown in accordance with one or more aspects of the present disclosure. The UE communication manager 1005 may be an example of aspects of the UE communication manager 815, the UE communication manager 915, or the UE communication manager 1110 described herein. The UE communication manager 1005 may include a sidelink information component 1010, a sidelink configuration component 1015, a mode component 1020, a discovery component 1025, a relay component 1030, a network component 1035, a messaging component 1040, a resource pool component 1045, a synchronization component 1050, and a sidelink component 1055. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

[0190] The sidelink information component 1010 can send the sidelink DRX information to the base station when operating in connected mode. In some examples, the sidelink information component 1010 can include the sidelink DRX information in the UAI. In some examples, the sidelink information component 1010 can send the UAI including the sidelink DRX information to the base station when operating in connected mode, wherein receiving the message including the sidelink DRX configuration is based on the UAI.

[0191] Sidelink configuration component 1015 can receive a message including a sidelink DRX configuration from a base station based on the sidelink DRX information. In some examples, sidelink configuration component 1015 can receive a message including a group sidelink DRX configuration associated with a group of UEs when operating in an out-of-coverage mode, an idle mode, or an inactive mode. In some examples, sidelink configuration component 1015 can determine a DRX cycle based on the sidelink DRX configuration, and the DRX cycle includes an active duration and an inactive duration. In some examples, sidelink configuration component 1015 can receive a SIB or RRC reconfiguration message including a group sidelink DRX configuration. In some examples, sidelink configuration component 1015 can enable discontinuous monitoring of a sidelink channel based on a SIB or RRC reconfiguration message.

[0192] In some examples, the sidelink configuration component 1015 can disable the DRX mode based on the QoS associated with the pending data service meeting the QoS threshold. In some cases, the sidelink DRX configuration includes a connected mode DRX configuration. In some cases, the sidelink DRX configuration includes a sidelink DRX preference associated with a discovery process including a first model discovery process or a second model discovery process. In some cases, the sidelink DRX configuration includes a sidelink DRX preference associated with receiving a downlink signal from a base station or sending an uplink signal to a base station or both. In some cases, the UE includes a remote UE and the second UE includes a relay UE between the remote UE and the base station. In some cases, the group sidelink DRX configuration includes a DRX cycle common to the group of UEs.

[0193] In some cases, the sidelink DRX configuration includes an active duration of the DRX cycle that is common to the group of UEs. In some cases, the sidelink DRX configuration includes a group offset duration between the start of the DRX cycle and the active duration of the DRX cycle, wherein the group offset duration is common to the group of UEs. In some cases, the UEs are grouped into the group of UEs based on a path loss parameter. In some cases, the UEs are grouped into the group of UEs based on a QoS associated with a data service of the UE. In some cases, the sidelink DRX configuration is based on a discovery resource pool corresponding to time and frequency resources for receiving a discovery request message or sending a discovery response message or both.

[0194] Mode component 1020 may operate according to a sidelink DRX configuration. In some examples, mode component 1020 may determine a time period for enabling discontinuous monitoring of a sidelink channel based on a group sidelink DRX configuration. In some examples, mode component 1020 may monitor the sidelink channel during the time period. In some examples, mode component 1020 may determine a single connection mode DRX cycle for sidelink communication or cellular communication or both based on the sidelink DRX configuration. In some examples, mode component 1020 may be based on a single connection mode DRX cycle while operating according to a sidelink DRX configuration. In some examples, the DRX cycle is determined based on a relay service associated with a second UE or a QoS associated with a data service of the UE or both, wherein the sidelink DRX information includes an indication of the DRX cycle.

[0195] In some examples, mode component 1020 may determine a value of an activity timer associated with the DRX cycle based on a relay service associated with the second UE or a QoS associated with the UE's data traffic, or both, wherein the sidelink DRX information includes an indication of the value of the activity timer associated with the DRX cycle. In some examples, mode component 1020 may determine a value of an inactivity timer associated with the DRX cycle based on a relay service associated with the second UE or a QoS associated with the UE's data traffic, or both, wherein the sidelink DRX information includes an indication of the value of the inactivity timer associated with the DRX cycle.

[0196] In some examples, an offset between the start of a DRX cycle and the start of an active duration of the DRX cycle is determined based on a relay service associated with a second UE or a QoS associated with a data service of the UE, or both, wherein the sidelink DRX information includes an indication of the offset. In some examples, the mode component 1020 may determine, based on the sidelink DRX configuration, a first sidelink DRX mode associated with a sidelink DRX configuration for monitoring a sidelink channel to receive a discovery signal. In some examples, the mode component 1020 may determine, based on the sidelink DRX configuration, a second sidelink DRX mode associated with a sidelink DRX configuration for receiving a downlink signal from a base station or sending an uplink signal to a base station, or both, wherein the first sidelink DRX mode is different from the second sidelink DRX mode.

[0197] In some examples, a UE-specific offset duration associated with the active duration of the DRX cycle is determined based on the sidelink DRX configuration, wherein monitoring the sidelink channel includes. In some examples, the mode component 1020 can enable the DRX mode based on the message. In some examples, the mode component 1020 can enable the DRX mode based on the QoS associated with the pending data service meeting the QoS threshold. In some examples, the mode component 1020 can enable the DRX mode based on the power level of the UE meeting the power level threshold. In some cases, the sidelink DRX configuration includes a first indication of a first sidelink DRX mode or a second indication of a second sidelink DRX mode, or both. In some cases, the time period is common to the group of UEs. In some cases, the UE-specific offset duration is based on an L2 identifier associated with the UE.

[0198] The discovery component 1025 may receive a discovery request message from the second UE during the active duration of the DRX cycle. In some examples, the discovery component 1025 may send a discovery response message to the second UE during the active duration of the DRX cycle. In some examples, the discovery component 1025 may monitor the sidelink channel based on the sidelink DRX configuration to receive a discovery signal from the second UE during the active duration of the DRX cycle. In some examples, the discovery component 1025 may receive a discovery signal from the second UE based on the monitoring. In some examples, the discovery component 1025 may broadcast a discovery request message during the active duration of the DRX cycle based on the sidelink DRX configuration.

[0199] In some examples, the discovery component 1025 may monitor the sidelink channel during the active duration of the DRX cycle to receive a discovery response message from the second UE. In some examples, the discovery component 1025 may receive a discovery response message from the second UE based on the monitoring, and the discovery signal includes the discovery response message. In some examples, the discovery component 1025 may determine a sidelink DRX mode for monitoring the sidelink channel to receive a discovery signal from the second UE based on the sidelink DRX configuration, the sidelink DRX mode including the DRX cycle, and the DRX cycle including the active duration and the inactive duration. In some examples, the discovery component 1025 may broadcast a discovery request message during the inactive duration of the DRX cycle associated with the group of UEs based on the data traffic status of the UE, wherein the inactive duration is common to the group of UEs, wherein the inactive duration and the DRX cycle are common to the group of UEs. In some cases, the sidelink DRX configuration is based on a discovery resource pool corresponding to the time and frequency resources associated with monitoring the sidelink channel to receive a discovery signal from the second UE.

[0200] The relay component 1030 may select the second UE for relay communication between the UE and the base station or between the UE and the third UE or both based on the discovery signal, wherein the relay communication corresponds to an L2 forwarding function or an L3 forwarding function. In some examples, the relay component 1030 may receive a synchronization signal from the second UE on a sidelink broadcast channel. In some examples, the relay component 1030 may synchronize with the second UE based on the synchronization signal.

[0201] The network component 1035 may receive a downlink signal from the base station using a cellular link based on the sidelink DRX configuration. In some examples, the network component 1035 may send an uplink signal to the base station using a cellular link based on the sidelink DRX configuration. In some examples, the network component 1035 may determine a sidelink DRX mode for receiving a downlink signal or sending an uplink signal or both based on the sidelink DRX configuration, the sidelink DRX mode including a DRX cycle, the DRX cycle including an active duration and an inactive duration, wherein receiving a downlink signal or sending an uplink signal or both is based on the sidelink DRX mode. In some examples, the network component 1035 may receive a downlink signal from the base station during the inactive duration of the DRX cycle associated with the group of UEs. In some examples, the network component 1035 may send an uplink signal to the base station during the inactive duration of the DRX cycle associated with the group of UEs, wherein the inactive duration and the DRX cycle are common to the group of UEs.

[0202] The message component 1040 can receive an RRC reconfiguration message including a sidelink DRX configuration from the base station. In some examples, the message component 1040 can send an RRC reconfiguration complete message to the base station based on the RRC reconfiguration message, wherein operating according to the sidelink DRX configuration is based on the RRC reconfiguration complete message.

[0203] The resource pool component 1045 can avoid monitoring one or more resource pools during the inactivity duration of the DRX cycle based on the group sidelink DRX configuration. In some examples, the resource pool component 1045 can avoid monitoring one or more resource pools associated with monitoring the sidelink channel for discovery signals based on the group resource pool configuration associated with monitoring discovery signals.

[0204] The synchronization component 1050 may synchronize with the group of UEs based on a synchronization signal received from at least one UE associated with the group of UEs on a sidelink broadcast channel. In some examples, the synchronization component 1050 may send a synchronization signal to a second UE on a sidelink broadcast channel. In some examples, the synchronization component 1050 may synchronize with the second UE based on the synchronization signal. The sidelink component 1055 may establish a connection with the second UE to relay the UE's communications, wherein the relayed communications correspond to an L2 forwarding function or an L3 forwarding function.

[0205] Fig.11A diagram of a system 1100 including a device 1105 according to one or more aspects of the present disclosure is shown. The device 1105 may be an example of or include components of a device 805, a device 905, or a UE 115 as described herein. The device 1105 may include components for two-way voice and data communications, including components for sending and receiving communications, including a UE communications manager 1110, an I / O controller 1115, a transceiver 1120, an antenna 1125, a memory 1130, and a processor 1140. These components may communicate electronically via one or more buses, such as a bus 1145.

[0206] The UE communication manager 1110 may transmit the sidelink DRX information to the base station when operating in the connected mode. The UE communication manager 1110 may receive a message including the sidelink DRX configuration from the base station based on the sidelink DRX information and operate according to the sidelink DRX configuration.

[0207] The UE communication manager 1110 may also receive a message including a group sidelink DRX configuration associated with a group of UEs when operating in an out-of-coverage mode, an idle mode, or an inactive mode. The UE communication manager 1110 may determine a time period for enabling discontinuous monitoring of a sidelink channel based on the group sidelink DRX configuration and monitor the sidelink channel during the time period.

[0208] The UE communication manager 1110 may also determine a DRX cycle based on the sidelink DRX configuration, the DRX cycle including an active duration and an inactive duration. The UE communication manager 1110 may receive a discovery request message from the second UE during the active duration of the DRX cycle, and send a discovery response message to the second UE during the active duration of the DRX cycle.

[0209] I / O controller 1115 can manage input and output signals for device 1105. I / O controller 1115 can also manage peripheral devices that are not integrated into device 1105. In some cases, I / O controller 1115 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1115 can use a physical interface such as a 1105. In some cases, the I / O controller 1115 may be implemented as part of the processor. In some cases, a user may interact with the device 1105 via the I / O controller 1115 or via hardware components controlled by the I / O controller 1115.

[0210] As described above, the transceiver 1120 can communicate bidirectionally via one or more antennas, wired or wireless links. For example, the transceiver 1120 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1120 can also include a modem, which is used to modulate the packet and provide the modulated packet to the antenna for transmission, and demodulate the packet received from the antenna. In some cases, the device 1105 may include a single antenna 1125. However, in some cases, the device 1105 may have more than one antenna 1125, which may be able to send or receive multiple wireless transmissions simultaneously.

[0211] Memory 1130 may include RAM and ROM. Memory 1130 may store computer-readable, computer-executable code 1135, which includes instructions that, when executed, cause processor 1140 to perform various functions described herein. In some cases, memory 1130 may contain, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0212] The code 1135 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1135 may be stored in a non-transitory computer-readable medium such as a system memory or other type of memory. In some cases, the code 1135 may not be directly executable by the processor 1140, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0213] Processor 1140 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or any combination thereof). In some cases, processor 1140 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into processor 1140. Processor 1140 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1130) to cause device 1105 to perform various functions (e.g., functions or tasks to support DRX for sidelink communications in a wireless communication system).

[0214] Fig.12A block diagram 1200 of a device 1205 is shown according to one or more aspects of the present disclosure. The device 1205 may be an example of aspects of a base station 105 as described herein. The device 1205 may include: a receiver 1210, a base station communication manager 1215, and a transmitter 1220. The device 1205 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0215] The receiver 1210 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to DRX for sidelink communication in a wireless communication system, etc.). The information may be delivered to other components of the device 1205. The receiver 1210 may be a reference Fig.15 Examples of various aspects of the transceiver 1520 are described. The receiver 1210 may use a single antenna or a collection of antennas.

[0216] The base station communication manager 1215 may receive sidelink DRX information from the UE, determine a sidelink DRX mode for the UE based on the sidelink DRX information, and send a message including a sidelink DRX configuration including an indication of the sidelink DRX mode for the UE. The base station communication manager 1215 may be an example of aspects of the base station communication manager 1510 described herein.

[0217] The base station communication manager 1215 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the base station communication manager 1215 or its subcomponents may be performed by a general purpose processor, a DSP, an application specific integrated circuit (ASIC), an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0218] The base station communication manager 1215 or its subcomponents may be physically located in various locations, including being distributed such that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the base station communication manager 1215 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of the present disclosure, the base station communication manager 1215 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof.

[0219] Transmitter 1220 can transmit signals generated by other components of device 1205. In some examples, transmitter 1220 can be co-located with receiver 1210 in a transceiver module. For example, transmitter 1220 can be a reference Fig.15 Examples of various aspects of the transceiver 1520 are described. The transmitter 1220 may use a single antenna or a collection of antennas.

[0220] Fig.13 A block diagram 1300 of a device 1305 is shown according to one or more aspects of the present disclosure. The device 1305 may be an example of aspects of the device 1205 or base station 105 as described herein. The device 1305 may include: a receiver 1310, a base station communication manager 1315, and a transmitter 1330. The device 1305 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0221] The receiver 1310 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to DRX for sidelink communication in a wireless communication system, etc.). The information may be delivered to other components of the device 1305. The receiver 1310 may be a reference Fig.15 Examples of various aspects of the transceiver 1520 are described. The receiver 1310 may use a single antenna or a collection of antennas.

[0222] The base station communication manager 1315 can be an example of aspects of the base station communication manager 1215 described herein. The base station communication manager 1315 can include a sidelink information component 1320 and a sidelink configuration component 1325. The base station communication manager 1315 can be an example of aspects of the base station communication manager 1510 described herein. The sidelink information component 1320 can receive sidelink DRX information from the UE. The sidelink configuration component 1325 can determine a sidelink DRX mode for the UE based on the sidelink DRX information and send a message including a sidelink DRX configuration, the sidelink DRX configuration including an indication of the sidelink DRX mode for the UE.

[0223] Transmitter 1330 can transmit signals generated by other components of device 1305. In some examples, transmitter 1330 can be co-located with receiver 1310 in a transceiver module. For example, transmitter 1330 can be a reference Fig.15 Examples of various aspects of the transceiver 1520 are described. The transmitter 1330 may use a single antenna or a collection of antennas.

[0224] Fig.14A block diagram 1400 of a base station communication manager 1405 is shown in accordance with one or more aspects of the present disclosure. The base station communication manager 1405 may be an example of aspects of the base station communication manager 1215, the base station communication manager 1315, or the base station communication manager 1510 described herein. The base station communication manager 1405 may include a sidelink information component 1410, a sidelink configuration component 1415, and a mode component 1420. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

[0225] The sidelink information component 1410 may receive sidelink DRX information from the UE. In some examples, the sidelink information component 1410 may receive a UAI including the sidelink DRX information from the UE. The sidelink configuration component 1415 may determine a sidelink DRX mode for the UE based on the sidelink DRX information. In some examples, the sidelink configuration component 1415 may send a message including a sidelink DRX configuration, which includes an indication of the sidelink DRX mode for the UE. In some examples, the sidelink configuration component 1415 may send an RRC reconfiguration message including the sidelink DRX configuration to the UE. In some examples, the sidelink configuration component 1415 may receive an RRC reconfiguration completion message to the base station based on the RRC reconfiguration message. In some cases, the sidelink DRX configuration includes a connection mode DRX configuration. In some cases, the sidelink DRX configuration includes a sidelink DRX preference.

[0226] Mode component 1420 may determine a sidelink DRX mode for the UE based on a resource pool configuration for the UE. In some examples, mode component 1420 may determine a first sidelink DRX mode associated with a sidelink DRX configuration for monitoring a sidelink channel for a discovery signal at the UE based on the sidelink DRX information. In some examples, mode component 1420 may determine a second sidelink DRX mode associated with a sidelink DRX configuration for receiving a downlink signal from a base station at the UE based on the sidelink DRX information, wherein the first sidelink DRX mode is different from the second sidelink DRX mode.

[0227] Fig.15A diagram of a system 1500 including a device 1505 according to one or more aspects of the present disclosure is shown. The device 1505 may be an example of or include components of a device 1205, a device 1305, or a base station 105 as described herein. The device 1505 may include components for two-way voice and data communications, including components for sending and receiving communications, including a base station communication manager 1510, a network communication manager 1515, a transceiver 1520, an antenna 1525, a memory 1530, a processor 1540, and an inter-station communication manager 1545. These components may communicate electronically via one or more buses, such as a bus 1550.

[0228] The base station communication manager 1510 may receive sidelink DRX information from the UE, determine a sidelink DRX mode for the UE based on the sidelink DRX information, and send a message including a sidelink DRX configuration including an indication of the sidelink DRX mode for the UE.

[0229] The network communications manager 1515 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1515 may manage the transmission of data communications for client devices such as one or more UEs 115.

[0230] As described above, the transceiver 1520 can communicate bidirectionally via one or more antennas, wired or wireless links. For example, the transceiver 1520 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1520 can also include a modem, which is used to modulate the packet and provide the modulated packet to the antenna for transmission, and demodulate the packet received from the antenna. In some cases, the device 1505 may include a single antenna 1525. However, in some cases, the device 1505 may have more than one antenna 1525, which may be able to send or receive multiple wireless transmissions at the same time.

[0231] Memory 1530 may include RAM, ROM, or a combination thereof. Memory 1530 may store computer readable code 1535, which includes instructions that, when executed by a processor (e.g., processor 1540), cause the device to perform various functions described herein. In some cases, memory 1530 may contain, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0232] The code 1535 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1535 may be stored in a non-transitory computer-readable medium such as a system memory or other type of memory. In some cases, the code 1535 may not be directly executable by the processor 1540, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0233] Processor 1540 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1540 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into processor 1540. Processor 1540 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1530) to cause device 1505 to perform various functions (e.g., functions or tasks to support DRX for sidelink communications in a wireless communication system).

[0234] The inter-site communication manager 1545 may manage communications with other base stations 105 and may include a controller or scheduler for coordinating with other base stations 105 to control communications with UE 115. For example, the inter-site communication manager 1545 may coordinate scheduling of transmissions to UE 115 for various interference mitigation techniques such as beamforming and / or joint transmissions. In some examples, the inter-site communication manager 1545 may provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0235] Fig.16 1600 according to one or more aspects of the present disclosure. As described herein, the operations of the method 1600 may be implemented by the UE 115 or a component thereof. For example, the operations of the method 1600 may be implemented by reference to Figures 8 to 11 In some examples, the UE may execute an instruction set to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may perform aspects of the functions described below using dedicated hardware.

[0236] At 1605, the UE may send sidelink DRX information to the base station when operating in connected mode. The operations of 1605 may be performed according to the methods described herein. In some examples, some aspects of the operations of 1605 may be described with reference to Figures 8 to 11 The described sidelink information component is performed.

[0237] At 1610, the UE may receive a message including a sidelink DRX configuration from a base station based on the sidelink DRX information. The operations of 1610 may be performed according to the methods described herein. In some examples, some aspects of the operations of 1610 may be described with reference to Figures 8 to 11 The described sidelink configuration components are performed.

[0238] At 1615, the UE may operate according to the sidelink DRX configuration. The operations of 1615 may be performed according to the methods described herein. In some examples, some aspects of the operations of 1615 may be described with reference to Figures 8 to 11 The described pattern components are executed.

[0239] Fig.17 1700 according to one or more aspects of the present disclosure. As described herein, the operations of the method 1700 may be implemented by the UE 115 or its components. For example, the operations of the method 1700 may be implemented by the reference UE 115 or its components. Figures 8 to 11 In some examples, the UE may execute an instruction set to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may perform aspects of the functions described below using dedicated hardware.

[0240] At 1705, the UE may receive a message including a group sidelink DRX configuration associated with a group of UEs while operating in an out-of-coverage mode, an idle mode, or an inactive mode. The operations of 1705 may be performed according to the methods described herein. In some examples, some aspects of the operations of 1705 may be described with reference to Figures 8 to 11 The described sidelink configuration components are performed.

[0241] At 1710, the UE may determine a time period for enabling discontinuous monitoring of the sidelink channel based on the group sidelink DRX configuration. The operations of 1710 may be performed according to the methods described herein. In some examples, some aspects of the operations of 1710 may be described with reference to Figures 8 to 11 The described pattern components are executed.

[0242] At 1715, the UE may monitor the sidelink channel during the time period. The operations of 1715 may be performed according to the methods described herein. In some examples, some aspects of the operations of 1715 may be described with reference to Figures 8 to 11 The described pattern components are executed.

[0243] Fig.181800 according to one or more aspects of the present disclosure. As described herein, the operations of the method 1800 may be implemented by the UE 115 or its components. For example, the operations of the method 1800 may be implemented by the reference UE 115 or its components. Figures 8 to 11 In some examples, the UE may execute an instruction set to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may perform aspects of the functions described below using dedicated hardware.

[0244] At 1805, the UE may determine a DRX cycle based on the sidelink DRX configuration, the DRX cycle comprising an active duration and an inactive duration. The operations of 1805 may be performed according to the methods described herein. In some examples, some aspects of the operations of 1805 may be described with reference to Figures 8 to 11 The described sidelink configuration components are performed.

[0245] At 1810, the UE may receive a discovery request message from a second UE during an active duration of a DRX cycle. The operations of 1810 may be performed according to the methods described herein. In some examples, some aspects of the operations of 1810 may be described with reference to Figures 8 to 11 The discovery component described is performed.

[0246] At 1815, the UE may send a discovery response message to the second UE during the active duration of the DRX cycle. The operations of 1815 may be performed according to the methods described herein. In some examples, some aspects of the operations of 1815 may be described with reference to Figures 8 to 11 The discovery component described is performed.

[0247] Fig.19 1900 according to one or more aspects of the present disclosure. As described herein, the operations of the method 1900 may be implemented by the base station 105 or a component thereof. For example, the operations of the method 1900 may be implemented by reference to Figures 12 to 15 The base station may be executed by the base station communication manager described herein. In some examples, the base station may execute an instruction set to control the functional units of the base station to perform the functions described below. Additionally or alternatively, the base station may perform aspects of the functions described below using dedicated hardware.

[0248] At 1905, the base station may receive sidelink DRX information from the UE. The operations of 1905 may be performed according to the methods described herein. In some examples, some aspects of the operations of 1905 may be described with reference to Figures 12 to 15 The described sidelink information component is performed.

[0249] At 1910, the base station may determine a sidelink DRX mode for the UE based on the sidelink DRX information. The operations of 1910 may be performed according to the methods described herein. In some examples, some aspects of the operations of 1910 may be described with reference to Figures 12 to 15 The described sidelink configuration components are performed.

[0250] At 1915, the base station may send a message including a sidelink DRX configuration including an indication of a sidelink DRX mode for the UE. The operations of 1915 may be performed according to the methods described herein. In some examples, some aspects of the operations of 1915 may be described with reference to Figures 12 to 15 The described sidelink configuration components are performed.

[0251] It should be noted that the methods described herein describe possible implementations, and that operations and steps may be rearranged or otherwise modified, and other implementations are possible. In addition, aspects from two or more of these methods may be combined.

[0252] The following provides an overview of examples of the present disclosure:

[0253] Example 1: A method for wireless communication at a UE is described. The method may include: sending sidelink discontinuous reception information to a base station when operating in a connected mode; receiving a message including a sidelink discontinuous reception configuration from the base station based at least in part on the sidelink discontinuous reception information; and operating according to the sidelink discontinuous reception configuration.

[0254] Example 2: The method according to Example 1 further includes: monitoring a sidelink channel to receive a discovery signal from a second UE during an active duration of a discontinuous reception period based at least in part on the sidelink discontinuous reception configuration; and receiving the discovery signal from the second UE based at least in part on the monitoring.

[0255] Example 3: A method according to Example 1 or Example 2, wherein the sidelink discontinuous reception configuration is based at least in part on a discovery resource pool corresponding to time and frequency resources associated with monitoring the sidelink channel to receive the discovery signal from the second UE.

[0256] Example 4: The method according to Examples 2 to 3 further includes: broadcasting a discovery request message during the active duration of the discontinuous reception cycle based at least in part on the sidelink discontinuous reception configuration; monitoring the sidelink channel during the active duration of the discontinuous reception cycle to receive a discovery response message from the second UE; and receiving the discovery response message from the second UE based at least in part on the monitoring, the discovery signal including the discovery response message.

[0257] Example 5: The method according to Examples 2 to 4 further includes: selecting the second UE for relay communication between the UE and the base station or between the UE and a third UE or both based at least in part on the discovery signal, wherein the relay communication corresponds to a layer 2 (L2) forwarding function or a layer 3 (L3) forwarding function.

[0258] Example 6: The method according to Examples 2 to 5 further includes: determining a sidelink discontinuous reception mode for monitoring the sidelink channel to receive the discovery signal from the second UE based at least in part on the sidelink discontinuous reception configuration, the sidelink discontinuous reception mode including the discontinuous reception period, and the discontinuous reception period including the active duration and the inactive duration.

[0259] Example 7: The method according to Examples 2 to 6 also includes: receiving a synchronization signal from the second UE on a sidelink broadcast channel; and synchronizing with the second UE at least in part based on the synchronization signal.

[0260] Example 8: The method according to Examples 1 to 7 further includes: receiving a downlink signal from the base station using a cellular link at least partially based on the sidelink discontinuous reception configuration; or sending an uplink signal to the base station using the cellular link at least partially based on the sidelink discontinuous reception configuration.

[0261] Example 9: The method according to Example 8 further includes: determining a sidelink discontinuous reception mode for receiving the downlink signal or sending the uplink signal or both based at least in part on the sidelink discontinuous reception configuration, the sidelink discontinuous reception mode comprising a discontinuous reception period, the discontinuous reception period comprising an active duration and an inactive duration, wherein receiving the downlink signal or sending the uplink signal or both is at least in part based on the sidelink discontinuous reception mode.

[0262] Example 10: A method according to Examples 1 to 9, wherein receiving the message includes: receiving a radio resource control reconfiguration message including the sidelink discontinuous reception configuration from the base station.

[0263] Example 11: The method according to Example 10 further includes: sending a radio resource control reconfiguration completion message to the base station based at least in part on the radio resource control reconfiguration message, wherein operation according to the sidelink discontinuous reception configuration is based at least in part on the radio resource control reconfiguration completion message.

[0264] Example 12: The method according to Examples 1 to 11 further includes: including the sidelink discontinuous reception information in UE auxiliary information; and sending the UE auxiliary information including the sidelink discontinuous reception information to the base station when operating in the connected mode, wherein receiving the message including the sidelink discontinuous reception configuration is at least partially based on the UE auxiliary information.

[0265] Example 13: The method according to Examples 1 to 12 further includes: determining a single connection mode discontinuous reception period for sidelink communication or cellular communication or both based at least in part on the sidelink discontinuous reception configuration, wherein operation according to the sidelink discontinuous reception configuration is at least in part based on the single connection mode discontinuous reception period.

[0266] Example 14: The method according to Examples 1 to 13 further includes: determining a discontinuous reception period based at least in part on a relay service associated with a second UE or a quality of service associated with a data service of the UE, or both, wherein the sidelink discontinuous reception information includes an indication of the discontinuous reception period.

[0267] Example 15: The method according to Examples 1 to 14 further includes: determining the value of an activity timer associated with a discontinuous reception period based at least in part on a relay service associated with a second UE or a quality of service associated with a data service for the UE, or both, wherein the sidelink discontinuous reception information includes an indication of the value of the activity timer associated with the discontinuous reception period.

[0268] Example 16: The method according to Examples 1 to 15 further includes: determining the value of an inactivity timer associated with a discontinuous reception period based at least in part on a relay service associated with a second UE or a quality of service associated with a data service for the UE, or both, wherein the sidelink discontinuous reception information includes an indication of the value of the inactivity timer associated with the discontinuous reception period.

[0269] Example 17: The method according to Examples 1 to 16 further includes: determining an offset between the start of a discontinuous reception period and the start of an active duration of the discontinuous reception period based at least in part on a relay service associated with a second UE or a quality of service associated with a data service for the UE, or both, wherein the sidelink discontinuous reception information includes an indication of the offset.

[0270] Example 18: The method according to Examples 1 to 17 further includes: determining a first sidelink discontinuous reception mode associated with the sidelink discontinuous reception configuration for monitoring a sidelink channel to receive a discovery signal based at least in part on the sidelink discontinuous reception configuration; and determining a second sidelink discontinuous reception mode associated with the sidelink discontinuous reception configuration for receiving a downlink signal from the base station or sending an uplink signal to the base station or both based at least in part on the sidelink discontinuous reception configuration, wherein the first sidelink discontinuous reception mode is different from the second sidelink discontinuous reception mode.

[0271] Example 19: A method according to Example 18, wherein the sidelink discontinuous reception configuration includes a first indication of the first sidelink discontinuous reception mode or a second indication of the second sidelink discontinuous reception mode, or both.

[0272] Example 20: A method according to Examples 1 to 19, wherein the sidelink discontinuous reception configuration includes a connected mode discontinuous reception configuration.

[0273] Example 21: A method according to Examples 1 to 20, wherein the sidelink discontinuous reception configuration includes a sidelink discontinuous reception preference associated with a discovery process including a first model discovery process or a second model discovery process.

[0274] Example 22: A method according to Examples 1 to 21, wherein the sidelink discontinuous reception configuration includes a sidelink discontinuous reception preference associated with receiving a downlink signal from the base station or sending an uplink signal to the base station, or both.

[0275] Example 23: The method according to Examples 1 to 22, wherein the UE includes a remote UE, and the second UE includes a relay UE between the remote UE and the base station.

[0276] Example 24: A method for wireless communication at a UE is described. The method may include: when operating in an out-of-coverage mode, an idle mode, or an inactive mode, receiving a message including a group sidelink discontinuous reception configuration associated with a group of UEs; determining a time period during which a sidelink channel can be discontinuously monitored based at least in part on the group sidelink discontinuous reception configuration; and monitoring the sidelink channel during the time period.

[0277] Example 25: A method according to Example 24, wherein receiving the message includes: receiving a system information block or a radio resource control reconfiguration message including the group sidelink discontinuous reception configuration.

[0278] Example 26: The method of Example 25 further comprising: enabling discontinuous monitoring of the sidelink channel based at least in part on the system information block or the radio resource control reconfiguration message.

[0279] Example 27: The method of Example 25, further comprising disabling the discontinuous reception mode based at least in part on a quality of service associated with the pending data traffic satisfying a quality of service threshold.

[0280] Example 28: A method according to Examples 24 to 27, wherein the group sidelink discontinuous reception configuration includes a discontinuous reception period that is common to the group of UEs.

[0281] Example 29: A method according to Examples 24 to 28, wherein the sidelink discontinuous reception configuration includes an activity duration of a discontinuous reception cycle that is common to the group of UEs.

[0282] Example 30: A method according to Examples 24 to 29, wherein the sidelink discontinuous reception configuration includes a group offset duration between the start of a discontinuous reception period and an active duration of the discontinuous reception period, wherein the group offset duration is common to the group of UEs.

[0283] Example 31: A method according to Examples 24 to 30, wherein the time period is common to the group of UEs.

[0284] Example 32: A method according to Examples 24 to 31, wherein the UEs are grouped in the group of UEs at least in part based on a path loss parameter.

[0285] Example 33: A method according to Examples 24 to 32, wherein the UE is grouped into the group of UEs based at least in part on quality of service associated with data traffic of the UE.

[0286] Example 34: The method according to Examples 24 to 22 further includes: determining a UE-specific offset duration associated with an active duration of a discontinuous reception cycle based at least in part on the sidelink discontinuous reception configuration, wherein monitoring the sidelink channel includes: monitoring the sidelink channel during the active duration of the discontinuous reception cycle based at least in part on the UE-specific offset duration.

[0287] Example 35: A method according to Example 34, wherein the UE-specific offset duration is based at least in part on a layer 2 (L2) identifier associated with the UE.

[0288] Example 36: The method of Examples 24 to 35, further comprising: enabling a discontinuous reception mode based at least in part on the message.

[0289] Example 37: The method of Examples 24 to 36, further comprising: enabling a discontinuous reception mode based at least in part on a quality of service associated with pending data traffic satisfying a quality of service threshold.

[0290] Example 38: The method according to Examples 24 to 37 also includes: enabling a discontinuous reception mode based at least in part on the UE's power level satisfying a power level threshold.

[0291] Example 39: The method according to Examples 24 to 38 also includes: avoiding monitoring one or more resource pools during an inactivity duration of a discontinuous reception period based at least in part on the group sidelink discontinuous reception configuration.

[0292] Example 40: The method according to Examples 24 to 39 also includes: avoiding monitoring one or more resource pools associated with monitoring the side link channel for the discovery signal based at least in part on the group resource pool configuration associated with monitoring the discovery signal.

[0293] Example 41: The method according to Examples 24 to 40 further includes: broadcasting a discovery request message during an inactivity duration of a discontinuous reception period associated with the group of UEs based at least in part on a data traffic condition of the UE, wherein the inactivity duration is common to the group of UEs, and wherein the inactivity duration and the discontinuous reception period are common to the group of UEs.

[0294] Example 42: The method according to Examples 24 to 41 further includes: receiving a downlink signal from a base station during an inactive duration of a discontinuous reception cycle associated with the group of UEs; or sending an uplink signal to the base station during an inactive duration of the discontinuous reception cycle associated with the group of UEs, wherein the inactive duration and the discontinuous reception cycle are common to the group of UEs.

[0295] Example 43: The method according to Examples 24 to 42 also includes: synchronizing with the group of UEs based at least in part on a synchronization signal received from at least one UE associated with the group of UEs on a sidelink broadcast channel.

[0296] Example 44: A method for wireless communication at a UE is described. The method may include: determining a discontinuous reception period based at least in part on a sidelink discontinuous reception configuration, the discontinuous reception period including an active duration and an inactive duration; receiving a discovery request message from a second UE during the active duration of the discontinuous reception period; and sending a discovery response message to the second UE during the active duration of the discontinuous reception period.

[0297] Example 45: A method according to Example 44, wherein the sidelink discontinuous reception configuration is based at least in part on a discovery resource pool corresponding to time and frequency resources for receiving the discovery request message or sending the discovery response message or both.

[0298] Example 46: The method according to Example 44 or 45 also includes: establishing a connection with the second UE to relay communications for the UE, wherein the relayed communication corresponds to a layer 2 (L2) forwarding function or a layer 3 (L3) forwarding function.

[0299] Example 47: The method according to Examples 44 to 46 also includes: sending a synchronization signal to the second UE on a sidelink broadcast channel; and synchronizing with the second UE at least in part based on the synchronization signal.

[0300] Example 48: A method for wireless communication at a base station is described. The method may include: receiving sidelink discontinuous reception information from a UE; determining a sidelink discontinuous reception mode for the UE based at least in part on the sidelink discontinuous reception information; and sending a message including a sidelink discontinuous reception configuration, the sidelink discontinuous reception configuration including an indication of the sidelink discontinuous reception mode for the UE.

[0301] Example 49: A method according to Example 48, wherein sending the message includes: sending a radio resource control reconfiguration message including the sidelink discontinuous reception configuration to the UE.

[0302] Example 50: The method of Example 49 further includes: receiving a radio resource control reconfiguration complete message from the base station based at least in part on the radio resource control reconfiguration message.

[0303] Example 51: The method according to Examples 48 to 50 also includes: receiving UE auxiliary information including the sidelink discontinuous reception information from the UE.

[0304] Example 52: The method according to Examples 48 to 51 also includes: determining the sidelink discontinuous reception mode for the UE based at least in part on the resource pool configuration for the UE.

[0305] Example 53: The method according to Examples 48 to 52 further includes: determining a first sidelink discontinuous reception mode associated with the sidelink discontinuous reception configuration for monitoring a sidelink channel for a discovery signal at the UE based at least in part on the sidelink discontinuous reception information; and determining a second sidelink discontinuous reception mode associated with the sidelink discontinuous reception configuration for receiving a downlink signal from the base station at the UE based at least in part on the sidelink discontinuous reception information, wherein the first sidelink discontinuous reception mode is different from the second sidelink discontinuous reception mode.

[0306] Example 54: A method according to Examples 48 to 53, wherein the sidelink discontinuous reception configuration includes a connected mode discontinuous reception configuration.

[0307] Example 55: A method according to Examples 48 to 54, wherein the sidelink discontinuous reception configuration includes a sidelink discontinuous reception preference.

[0308] Example 56: An apparatus for wireless communication, comprising a processor; and a memory coupled to the processor; the processor and the memory are configured to execute the method described in any of Examples 1-23.

[0309] Example 57: An apparatus for wireless communication, comprising at least one unit for executing the method described in any of Examples 1-23.

[0310] Example 58: A computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method described in any of Examples 1-23.

[0311] Example 59: An apparatus for wireless communication, comprising a processor; and a memory coupled to the processor; the processor and the memory are configured to perform the method described in any of Examples 24-43.

[0312] Example 60: An apparatus for wireless communication, comprising at least one unit for performing the method described in any of Examples 24-43.

[0313] Example 61: A computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method described in any of Examples 24-43.

[0314] Example 62: An apparatus for wireless communication, comprising a processor; and a memory coupled to the processor; the processor and the memory are configured to perform the method described in any of Examples 44-47.

[0315] Example 63: An apparatus for wireless communication, comprising at least one unit for performing the method described in any of Examples 44-47.

[0316] Example 64: A computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method described in any of Examples 44-47.

[0317] Example 65: An apparatus for wireless communication, comprising a processor; and a memory coupled to the processor; the processor and the memory are configured to perform the method described in any of Examples 48-55.

[0318] Example 66: An apparatus for wireless communication, comprising at least one unit for performing the method described in any of Examples 48-55.

[0319] Example 67: A computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method described in any of Examples 48-55.

[0320] Although some aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may be applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0321] Any of a variety of different technologies and methods may be used to represent the information and signals described herein. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout this specification may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0322] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but, in an alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other such configuration).

[0323] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented by software executed by a processor, the functions may be stored on a computer-readable medium or transmitted by a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or any combination thereof. Features that implement the functions may also be physically placed in various locations, including portions that are distributed so as to implement the functions at different physical locations.

[0324] Computer-readable medium includes both non-transitory computer storage medium and communication medium, and the communication medium includes any medium that helps to transfer a computer program from one place to another place.Non-transitory storage medium can be any available medium that can be accessed by a general-purpose computer or a special-purpose computer.By way of example and not limitation, non-transitory computer-readable medium can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, disk storage or other magnetic storage device, or can be used for carrying or storing the program code unit with the expectation of instruction or data structure form and can be accessed by general-purpose or special-purpose computer or general-purpose or special-purpose processor Any other non-transitory medium.In addition, any connection can be appropriately referred to as computer-readable medium.For example, if software is sent from a website, server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are included in the definition of computer-readable medium. As used herein, disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, wherein disks usually reproduce data magnetically, while discs use lasers to reproduce data optically. Combinations of the above should also be included within the scope of computer readable media.

[0325] As used herein, including in the claims, "or" as used in a list of items (e.g., a list of items preceded by a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A, or B, or C, or AB, or AC, or BC, or ABC (i.e., A and B and C). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" is to be interpreted in the same manner as the phrase "based at least in part on."

[0326] In the drawings, similar components or features may have the same reference number. In addition, individual components of the same type may be distinguished by following the reference number with a dash and a second reference number for distinguishing between similar components. If only the first reference number is used in this specification, the description applies to any of the similar components having the same first reference number, without regard to the second reference number or other subsequent reference numbers.

[0327] The description set forth herein in conjunction with the accompanying drawings describes example configurations and does not represent all examples that can be implemented or within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "advantageous" relative to other examples. In order to provide an understanding of the described techniques, the detailed description includes specific details. However, these techniques may be implemented without using these specific details. In some cases, in order to avoid obscuring the concepts of the described examples, well-known structures and devices are shown in block diagram form.

[0328] The description herein is provided to enable one of ordinary skill in the art to implement or use the disclosure. Various modifications to the disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applicable to other variations without departing from the scope of the disclosure. Therefore, the disclosure is not limited to the examples and designs described herein, but conforms to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for wireless communication at a user equipment (UE), comprising: one or more memories; and One or more processors, the one or more processors are coupled to one or more memories and configured to cause the UE to perform the following operations: sending sidelink discontinuous reception information to a network entity when operating in connected mode; receiving, from the network entity, a first radio resource control (RRC) reconfiguration message including a sidelink discontinuous reception configuration based at least in part on the sidelink discontinuous reception information, the sidelink discontinuous reception configuration including a first discontinuous reception mode for relay discovery monitoring; receiving a second RRC reconfiguration message from the network entity, the second RRC reconfiguration message comprising a second discontinuous reception mode for reception over the Uu interface; and Communicating according to the sidelink discontinuous reception configuration.

2. The device according to claim 1, wherein: The one or more processors are further configured to: monitoring a sidelink channel to receive a discovery signal from a second UE during an active duration of a discontinuous reception period based at least in part on the sidelink discontinuous reception configuration; as well as The discovery signal is received from the second UE based at least in part on the monitoring.

3. The device according to claim 2, wherein: The sidelink discontinuous reception configuration is based at least in part on a discovery resource pool corresponding to time and frequency resources associated with monitoring the sidelink channel to receive the discovery signal from the second UE.

4. The device according to claim 2, wherein: The one or more processors are further configured to: broadcasting a discovery request message during the active duration of the discontinuous reception period based at least in part on the sidelink discontinuous reception configuration, monitoring the sidelink channel during the active duration of the discontinuous reception period to receive a discovery response message from the second UE, and receiving the discovery response message from the second UE based at least in part on the monitoring, the discovery signal comprising the discovery response message; or selecting the second UE for relay communication between the UE and the network entity or between the UE and a third UE, or both, based at least in part on the discovery signal, wherein the relay communication corresponds to a layer 2 (L2) forwarding function or a layer 3 (L3) forwarding function; or determining, based at least in part on the sidelink discontinuous reception configuration, a sidelink discontinuous reception mode for monitoring the sidelink channel to receive the discovery signal from the second UE, the sidelink discontinuous reception mode comprising the discontinuous reception period, the discontinuous reception period comprising the activity duration and the inactivity duration; or A synchronization signal is received from the second UE on a sidelink broadcast channel, and synchronization with the second UE is performed based at least in part on the synchronization signal.

5. The device according to claim 1, wherein: The one or more processors are further configured to: receiving a downlink signal from the network entity using a cellular link based at least in part on the sidelink discontinuous reception configuration; or An uplink signal is sent to the network entity using the cellular link based at least in part on the sidelink discontinuous reception configuration.

6. The device according to claim 5, wherein: The one or more processors are further configured to: determining a sidelink discontinuous reception mode for receiving the downlink signal or sending the uplink signal or both based at least in part on the sidelink discontinuous reception configuration, the sidelink discontinuous reception mode comprising a discontinuous reception period, the discontinuous reception period comprising an activity duration and an inactivity duration, Wherein, receiving the downlink signal or sending the uplink signal or both are at least partially based on the sidelink discontinuous reception mode.

7. The device according to claim 1, wherein: The one or more processors are further configured to: sending an RRC reconfiguration complete message to the network entity based at least in part on the first RRC reconfiguration message, Wherein communicating according to the sidelink discontinuous reception configuration is at least partially based on the RRC reconfiguration complete message.

8. The device according to claim 1, wherein: The one or more processors are further configured to: including the sidelink discontinuous reception information in UE assistance information; and sending the UE assistance information including the sidelink discontinuous reception information to the network entity when operating in the connected mode, Wherein, receiving the message including the sidelink discontinuous reception configuration is at least partially based on the UE assistance information.

9. The device according to claim 1, wherein: The one or more processors are further configured to: determining a discontinuous reception period based at least in part on a relay service associated with a second UE or a quality of service associated with a data traffic of the UE, or both, wherein the sidelink discontinuous reception information includes an indication of the discontinuous reception period; or determining a value of an activity timer associated with a discontinuous reception period based at least in part on a relay service associated with a second UE or a quality of service associated with a data traffic of the UE, or both, wherein the sidelink discontinuous reception information includes an indication of the value of the activity timer associated with the discontinuous reception period; or determining a value of an inactivity timer associated with a discontinuous reception period based at least in part on a relay service associated with a second UE or a quality of service associated with a data traffic of the UE, or both, wherein the sidelink discontinuous reception information includes an indication of the value of the inactivity timer associated with the discontinuous reception period; or An offset between the start of a discontinuous reception period and the start of an active duration of the discontinuous reception period is determined at least in part based on a relay service associated with a second UE or a quality of service associated with a data service of the UE, or both, wherein the sidelink discontinuous reception information includes an indication of the offset.

10. The device according to claim 1, wherein: The first discontinuous reception mode is different from the second discontinuous reception mode.

11. The device according to claim 10, wherein: The sidelink discontinuous reception configuration includes a first indication of the first discontinuous reception mode or a second indication of the second discontinuous reception mode, or both.

12. The device according to claim 1, wherein: The sidelink discontinuous reception configuration includes a sidelink discontinuous reception preference associated with: A discovery process, wherein the discovery process includes a first model discovery process or a second model discovery process; or receiving a downlink signal from the network entity or sending an uplink signal to the network entity; or These two.

13. An apparatus for wireless communication at a network entity, comprising: one or more memories; and One or more processors, the one or more processors are coupled to one or more memories and are configured to cause the network entity to perform the following operations: receiving sidelink discontinuous reception information from a user equipment (UE); determining a sidelink discontinuous reception mode for the UE based at least in part on the sidelink discontinuous reception information; sending a first radio resource control (RRC) reconfiguration message including a sidelink discontinuous reception configuration, the sidelink discontinuous reception configuration including an indication of the sidelink discontinuous reception mode for relay discovery monitoring of the UE; and A second RRC reconfiguration message is sent, the second RRC reconfiguration message comprising a discontinuous reception mode for reception over the Uu interface.

14. The device according to claim 13, wherein: The one or more processors are further configured to: determining the sidelink discontinuous reception mode for the UE based at least in part on a resource pool configuration for the UE; or determining, based at least in part on the sidelink discontinuous reception information, a first sidelink discontinuous reception mode associated with the sidelink discontinuous reception configuration for monitoring a sidelink channel for a discovery signal at the UE; as well as A second sidelink discontinuous reception mode associated with the sidelink discontinuous reception configuration for receiving a downlink signal from the network entity at the UE is determined at least in part based on the sidelink discontinuous reception information, wherein the first sidelink discontinuous reception mode is different from the second sidelink discontinuous reception mode.

15. The device according to claim 13, wherein: The sidelink discontinuous reception configuration includes a connected mode discontinuous reception configuration or a sidelink discontinuous reception preference.

16. A method for wireless communication at a user equipment (UE), comprising: sending sidelink discontinuous reception information to a network entity when operating in connected mode; receiving, from the network entity, a first radio resource control (RRC) reconfiguration message including a sidelink discontinuous reception configuration based at least in part on the sidelink discontinuous reception information, the sidelink discontinuous reception configuration including a first discontinuous reception mode for relay discovery monitoring; receiving a second RRC reconfiguration message from the network entity, the second RRC reconfiguration message comprising a second discontinuous reception mode for reception over the Uu interface; and Communicating according to the sidelink discontinuous reception configuration.

17. The method according to claim 16, further comprising: monitoring a sidelink channel to receive a discovery signal from a second UE during an active duration of a discontinuous reception period based at least in part on the sidelink discontinuous reception configuration; as well as The discovery signal is received from the second UE based at least in part on the monitoring.

18. The method according to claim 17, wherein: The sidelink discontinuous reception configuration is based at least in part on a discovery resource pool corresponding to time and frequency resources associated with monitoring the sidelink channel to receive the discovery signal from the second UE.

19. The method according to claim 17, further comprising: broadcasting a discovery request message during the active duration of the discontinuous reception period based at least in part on the sidelink discontinuous reception configuration, monitoring the sidelink channel during the active duration of the discontinuous reception period to receive a discovery response message from the second UE, and receiving the discovery response message from the second UE based at least in part on the monitoring, the discovery signal comprising the discovery response message; or selecting the second UE for relay communication between the UE and the network entity or between the UE and a third UE, or both, based at least in part on the discovery signal, wherein the relay communication corresponds to a layer 2 (L2) forwarding function or a layer 3 (L3) forwarding function; or determining, based at least in part on the sidelink discontinuous reception configuration, a sidelink discontinuous reception mode for monitoring the sidelink channel to receive the discovery signal from the second UE, the sidelink discontinuous reception mode comprising the discontinuous reception period, the discontinuous reception period comprising the activity duration and the inactivity duration; or A synchronization signal is received from the second UE on a sidelink broadcast channel, and synchronization with the second UE is performed based at least in part on the synchronization signal.

20. The method of claim 16, further comprising: receiving a downlink signal from the network entity using a cellular link based at least in part on the sidelink discontinuous reception configuration; or An uplink signal is sent to the network entity using the cellular link based at least in part on the sidelink discontinuous reception configuration.

21. The method according to claim 20, further comprising: determining a sidelink discontinuous reception mode for receiving the downlink signal or sending the uplink signal or both based at least in part on the sidelink discontinuous reception configuration, the sidelink discontinuous reception mode comprising a discontinuous reception period, the discontinuous reception period comprising an activity duration and an inactivity duration, Wherein, receiving the downlink signal or sending the uplink signal or both are at least partially based on the sidelink discontinuous reception mode.

22. The method of claim 16, further comprising: sending an RRC reconfiguration complete message to the network entity based at least in part on the first RRC reconfiguration message, Wherein communicating according to the sidelink discontinuous reception configuration is at least partially based on the RRC reconfiguration complete message.

23. The method of claim 16, further comprising: Including the sidelink discontinuous reception information in UE assistance information; as well as sending the UE assistance information including the sidelink discontinuous reception information to the network entity when operating in the connected mode, Wherein, receiving the message including the sidelink discontinuous reception configuration is at least partially based on the UE assistance information.

24. The method of claim 16, further comprising: determining a discontinuous reception period based at least in part on a relay service associated with a second UE or a quality of service associated with a data traffic of the UE, or both, wherein the sidelink discontinuous reception information includes an indication of the discontinuous reception period; or determining a value of an activity timer associated with a discontinuous reception period based at least in part on a relay service associated with a second UE or a quality of service associated with a data traffic of the UE, or both, wherein the sidelink discontinuous reception information includes an indication of the value of the activity timer associated with the discontinuous reception period; or determining a value of an inactivity timer associated with a discontinuous reception period based at least in part on a relay service associated with a second UE or a quality of service associated with a data traffic of the UE, or both, wherein the sidelink discontinuous reception information includes an indication of the value of the inactivity timer associated with the discontinuous reception period; or An offset between the start of a discontinuous reception period and the start of an active duration of the discontinuous reception period is determined at least in part based on a relay service associated with a second UE or a quality of service associated with a data service of the UE, or both, wherein the sidelink discontinuous reception information includes an indication of the offset.

25. The method of claim 16, wherein: The first discontinuous reception mode is different from the second discontinuous reception mode.

26. The method according to claim 25, wherein: The sidelink discontinuous reception configuration includes a first indication of the first discontinuous reception mode or a second indication of the second discontinuous reception mode, or both.

27. The method of claim 16, wherein: The sidelink discontinuous reception configuration includes a sidelink discontinuous reception preference associated with: A discovery process, wherein the discovery process includes a first model discovery process or a second model discovery process; or receiving a downlink signal from the network entity or sending an uplink signal to the network entity; or These two.

28. A method for wireless communication at a network entity, comprising: receiving sidelink discontinuous reception information from a user equipment (UE); determining a sidelink discontinuous reception mode for the UE based at least in part on the sidelink discontinuous reception information; sending a first radio resource control (RRC) reconfiguration message including a sidelink discontinuous reception configuration, the sidelink discontinuous reception configuration including an indication of the sidelink discontinuous reception mode for relay discovery monitoring of the UE; and A second RRC reconfiguration message is sent, the second RRC reconfiguration message comprising a discontinuous reception mode for reception over the Uu interface.

29. The method according to claim 28, further comprising: determining the sidelink discontinuous reception mode for the UE based at least in part on a resource pool configuration for the UE; or determining, based at least in part on the sidelink discontinuous reception information, a first sidelink discontinuous reception mode associated with the sidelink discontinuous reception configuration for monitoring a sidelink channel for a discovery signal at the UE; as well as A second sidelink discontinuous reception mode associated with the sidelink discontinuous reception configuration for receiving a downlink signal from the network entity at the UE is determined at least in part based on the sidelink discontinuous reception information, wherein the first sidelink discontinuous reception mode is different from the second sidelink discontinuous reception mode.

30. The method of claim 28, wherein: The sidelink discontinuous reception configuration includes a connected mode discontinuous reception configuration or a sidelink discontinuous reception preference.

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