Discontinuous reception mechanism for sidelink

Abstract

Methods, systems, and devices for wireless communication are described. The method includes: receiving a discontinuous transmission configuration for a sidelink connection between a first UE and a second UE from a second UE; determining a set of receive beams for discontinuous reception of the sidelink connection by the first UE based on the received discontinuous transmission configuration; and sending a discontinuous reception configuration to the second UE, the discontinuous reception configuration indicating the determined set of receive beams for discontinuous reception of the sidelink connection.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of U.S. Provisional Patent Application No. 63 / 021,261, filed by DUTTA et al. on May 7, 2020, entitled “DISCONTINUOUS RECEPTION MECHANISM FOR SIDELINK”; and U.S. Patent Application No. 17 / 308,802, filed by DUTTA et al. on May 5, 2021, entitled “DISCONTINUOUS RECEPTION MECHANISM FOR SIDELINK”; each of which is assigned to the assignee of this Agreement. Technical Field

[0003] The following relates generally to wireless communications, and more particularly to discontinuous reception mechanisms for sidelink communications. Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messages, broadcasts, etc. These systems can 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, which 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). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each base station or node simultaneously supporting communication with multiple communication devices, which may also be referred to as user equipment (UE).

[0005] A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each base station or node simultaneously supporting communication for multiple communication devices, which may also be referred to as user equipment (UE). Some wireless communication systems, such as 4G and 5G systems, may support sidelink communications between multiple communication devices. Examples of sidelink communications may include, but are not limited to, device-to-device (D2D) communications, vehicle-based communications, which may also be referred to as vehicle-to-everything (V2X) communication systems, vehicle-to-vehicle (V2V) communication systems, cellular V2X (C-V2X) communication systems, and the like. As the demand for communication efficiency increases, some wireless communication systems, such as 4G and 5G systems, may wish to provide improvements to sidelink communications to support, for example, higher reliability and low latency sidelink operations. Summary of the invention

[0006] The described techniques relate to improved methods, systems, devices, and apparatuses for supporting discontinuous reception mechanisms for sidelink communications. In general, the described techniques provide for a receiving UE to send a DRX notification to a peer UE (e.g., a sending UE), the DRX notification including the beam direction that the receiving UE monitors in each DRX period. The sending UE may attempt to send control or data or both using a beam aligned with one of the beams indicated in the DRX notification.

[0007] A method of wireless communication at a first UE is described. The method may include: receiving a discontinuous transmission configuration for a sidelink connection between the first UE and the second UE from a second UE; determining a set of receive beams for discontinuous reception of the sidelink connection by the first UE based on the received discontinuous transmission configuration; and sending a discontinuous reception configuration indicating the determined set of receive beams for discontinuous reception of the sidelink connection to the second UE.

[0008] An apparatus for wireless communication at a first UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the apparatus to receive a discontinuous transmission configuration for a sidelink connection between the first UE and the second UE from a second UE, determine a set of receive beams for discontinuous reception used by the first UE for the sidelink connection based on the received discontinuous transmission configuration, and send a discontinuous reception configuration indicating the determined set of receive beams for discontinuous reception of the sidelink connection to the second UE.

[0009] Another apparatus for wireless communication at a first UE is described. The apparatus may include components for receiving a discontinuous transmission configuration for a sidelink connection between the first UE and the second UE from a second UE, determining a set of receive beams for discontinuous reception of the sidelink connection by the first UE based on the received discontinuous transmission configuration, and transmitting a discontinuous reception configuration indicating the determined set of receive beams for discontinuous reception of the sidelink connection to the second UE.

[0010] A non-transitory computer-readable medium storing code for wireless communication at a first UE is described. The code may include instructions executable by a processor to receive a discontinuous transmission configuration for a sidelink connection between the first UE and the second UE from a second UE, determine a set of receive beams for discontinuous reception of the sidelink connection by the first UE based on the received discontinuous transmission configuration, and send a discontinuous reception configuration indicating the determined set of receive beams for discontinuous reception of the sidelink connection to the second UE.

[0011] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting a discontinuous reception configuration may also include operations, features, components, or instructions for transmitting an indication of at least one beam in a set of receive beams.

[0012] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending a discontinuous reception configuration may also include operations, features, components, or instructions for sending an indication of time resources or frequency resources, or both, corresponding to one or more receive beams in a receive beam set.

[0013] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an indication of time resources or frequency resources or both may include operations, features, components, or instructions for sending an indication of time resources for a cyclic set of discontinuous reception, during which time resources the first UE may receive using each corresponding receive beam in the receive beam set.

[0014] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for attempting to receive a transmission from a second UE on a determined set of receive beams via a corresponding set of opportunities during a discontinuous reception cycle, and receiving a transmission from the second UE on a receive beam in the set of receive beams during one of the sets of opportunities corresponding to the receive beam.

[0015] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a discontinuous reception configuration may be transmitted to the second UE during a discontinuous transmission opportunity indicated in a received discontinuous transmission configuration.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a discontinuous reception configuration may be sent to the second UE during a discontinuous reception ON duration of the second UE.

[0017] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, modules, or instructions for sending a set of discontinuous reception configurations including the discontinuous reception configuration to a second UE, wherein each of the set of discontinuous reception configurations includes a receive beam configuration that the first UE can use during a single discontinuous reception ON duration of the second UE.

[0018] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for assigning a first index corresponding to a receive beam configuration of a discontinuous reception configuration to a second UE, wherein the discontinuous reception configuration includes the receive beam configuration and the first assignment index.

[0019] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying a receive beam set that a first UE may be configured to form and determining to use a first receive beam and a second receive beam in the receive beam set to receive a transmission from a second UE, wherein the receive beam configuration indicates the first receive beam and the second receive beam.

[0020] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying that a first receive beam may be preferred over a second receive beam, wherein the first allocation index corresponds to the first receive beam based on the first receive beam being preferred over the second receive beam.

[0021] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first allocation index may be indicated for the entire discontinuous reception ON duration.

[0022] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a first allocation index may be indicated for a first duration of a discontinuous reception ON duration, and a second index may be indicated for a second duration of the discontinuous reception ON duration, the second index pointing to a second receive beam configuration of the discontinuous reception configuration.

[0023] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for assigning a second index corresponding to a second receive beam configuration of a discontinuous reception configuration to a second UE, wherein the discontinuous reception configuration includes a receive beam configuration, a first allocation index, and a second allocation index, and wherein the second UE can use the first allocation index or the second allocation index to reestablish a connection with the first UE.

[0024] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for indicating to the second UE that the second allocation index includes a reduced quality of service relative to the first allocation index.

[0025] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the discontinuous reception configuration includes a discontinuous reception period, or a frame offset, or a time slot offset, or a discontinuous reception ON duration, or an indication of an index of a receive beam configuration of the discontinuous reception configuration selected by the first UE for use during the discontinuous reception ON duration, or a combination thereof.

[0026] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a first radio resource control connection reconfiguration message from a second UE via a sidelink connection, wherein the first radio resource control connection reconfiguration message includes a discontinuous transmission configuration.

[0027] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a second radio resource control connection reconfiguration message to a second UE based on the first radio resource control connection reconfiguration message from the second UE.

[0028] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a request to apply an offset to a discontinuous transmission configuration to a second UE based on a first radio resource control connection reconfiguration message from the second UE.

[0029] A method of wireless communication at a second UE is described. The method may include: sending a discontinuous transmission configuration for a sidelink connection between the first UE and the second UE to a first UE; receiving a discontinuous reception configuration for the sidelink connection from the first UE, the discontinuous reception configuration indicating a set of receive beams used by the first UE for discontinuous reception of the sidelink connection based on the sent discontinuous transmission configuration; and sending signaling to the first UE using the sidelink connection based on the sent discontinuous transmission configuration and based on the received discontinuous reception configuration.

[0030] An apparatus for wireless communication at a second UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the apparatus to send a discontinuous transmission configuration for a sidelink connection between the first UE and the second UE to a first UE, receive a discontinuous reception configuration for the sidelink connection from the first UE, the discontinuous reception configuration indicating a set of receive beams for discontinuous reception used by the first UE for the sidelink connection based on the sent discontinuous transmission configuration, and send signaling to the first UE using the sidelink connection based on the sent discontinuous transmission configuration and based on the received discontinuous reception configuration.

[0031] Another apparatus for wireless communication at a second UE is described. The apparatus may include components for: sending a discontinuous transmission configuration for a sidelink connection between the first UE and the second UE to a first UE; receiving a discontinuous reception configuration for the sidelink connection from the first UE, the discontinuous reception configuration indicating a set of receive beams for discontinuous reception of the sidelink connection by the first UE based on the sent discontinuous transmission configuration; and sending signaling to the first UE using the sidelink connection based on the sent discontinuous transmission configuration and based on the received discontinuous reception configuration.

[0032] A non-transitory computer-readable medium storing code for wireless communication at a second UE is described. The code may include instructions executable by a processor to send a discontinuous transmission configuration for a sidelink connection between the first UE and the second UE to a first UE, receive a discontinuous reception configuration for the sidelink connection from the first UE, the discontinuous reception configuration indicating a set of receive beams used by the first UE for discontinuous reception of the sidelink connection based on the sent discontinuous transmission configuration, and send signaling to the first UE using the sidelink connection based on the sent discontinuous transmission configuration and based on the received discontinuous reception configuration.

[0033] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying a transmit beam of a second UE corresponding to a receive beam of a first UE, where the receive beam of the first UE may be indicated in a discontinuous reception configuration, and signaling is sent on the identified transmit beam.

[0034] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining time resources or frequency resources, or both, corresponding to one or more receive beams in a receive beam set according to a discontinuous reception configuration.

[0035] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a discontinuous reception configuration may be received during a discontinuous transmission opportunity indicated in a transmitted discontinuous transmission configuration.

[0036] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a discontinuous reception configuration may be received during a discontinuous reception ON duration of the second UE.

[0037] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a set of discontinuous reception configurations including the discontinuous reception configuration from a first UE, wherein each of the set of discontinuous reception configurations includes a receive beam configuration that the first UE can use during a single discontinuous reception ON duration of a second UE.

[0038] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a first index corresponding to a receive beam configuration of a discontinuous reception configuration from a first UE, wherein the discontinuous reception configuration includes the receive beam configuration and the first allocation index.

[0039] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving, from the first UE, a second index corresponding to a second receive beam configuration of the discontinuous reception configuration.

[0040] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for reestablishing a connection with the first UE using the first reception index or the second reception index.

[0041] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining that the second reception index includes a reduction in quality of service relative to the first reception index, and when sending a signal to the first UE using the second reception index, increasing the transmission power or downgrading the modulation and coding scheme, or both.

[0042] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for a first instance of sending a message in a first beam direction indicated in a discontinuous reception configuration, a second instance of sending a message in a second beam direction indicated in the discontinuous reception configuration based on receiving negative feedback or not receiving feedback for the first instance, receiving positive feedback for the message, and bypassing a third instance of sending the message in a third beam direction based on receiving the positive feedback.

[0043] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a first radio resource control connection reconfiguration message to a first UE using a sidelink connection, wherein the first radio resource control connection reconfiguration message includes a discontinuous transmission configuration.

[0044] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a second radio resource control connection reconfiguration message from the first UE based on sending the first radio resource control connection reconfiguration message to the first UE.

[0045] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a request to apply an offset to a discontinuous transmission configuration from a first UE based on sending a first radio resource control connection reconfiguration message to the first UE.

[0046] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a data packet to a first UE using a sidelink connection, receiving confirmation feedback from the first UE indicating a negative confirmation or no confirmation, retransmitting the data packet to the first UE using the sidelink connection based on the received confirmation feedback, and receiving a radio resource control connection reconfiguration message from the first UE at least in part in response to the retransmission of the data packet.

[0047] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a first radio resource control connection reconfiguration message and at least a portion of a data packet to a first UE using a sidelink connection, and receiving a second radio resource control connection reconfiguration message from the first UE based on at least a portion of the first radio resource control connection reconfiguration message or the data packet.

[0048] The features and technical advantages of the examples according to the present disclosure have been outlined quite broadly above so that the following detailed description may be better understood. Additional features and advantages are described below. The disclosed concepts and examples may be easily used as the basis for modifying or designing other structures for achieving the same purpose of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features of the concepts disclosed herein, their organization and methods of operation, and related advantages may be better understood from the following description when considered in conjunction with the accompanying drawings. Each of the accompanying drawings is provided for the purpose of illustration and description and not as a definition of limitations to the claims.

[0049] Although aspects and embodiments are described in this application by illustrating some examples, it is understood by those skilled in the art that additional implementations and use cases may occur in many different arrangements and scenarios. The technology described herein can be implemented across many different platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, embodiments and / or uses may be implemented by integrated chip embodiments and other devices based on non-module components (e.g., end-user devices, vehicles, communication devices, computing devices, industrial devices, retail / purchase devices, medical devices, artificial intelligence (AI) enabling devices, etc.). Although some examples may or may not be specifically targeted at use cases or applications, a variety of applicability of the described innovations may occur. The range of implementations can range from chip-level or modular components to non-modular, non-chip-level implementations, and further to collections, distributed or original equipment manufacturers (OEM) devices or systems that combine one or more aspects of the described innovations. In some practical settings, the devices that combine the described aspects and features may also have to include additional components and features for implementing and practicing the claimed and described embodiments. For example, the transmission and reception of wireless signals includes multiple components for analog and digital purposes (e.g., hardware components include antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders / summers, etc.). It is intended that the innovations described herein can be practiced in a variety of devices, chip-level components, systems, distributed arrangements, end-user devices, etc. of different sizes, shapes, and configurations. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 An example of a wireless communication system supporting a discontinuous reception mechanism for sidelink communications according to aspects of the present disclosure is illustrated.

[0051] Figure 2 An example of a wireless communication system supporting a discontinuous reception mechanism for sidelink communications according to aspects of the present disclosure is illustrated.

[0052] Figure 3 An example of a transmission timeline supporting a discontinuous reception mechanism for sidelink communications is illustrated according to aspects of the present disclosure.

[0053] Figure 4 An example of a wireless communication system supporting a discontinuous reception mechanism for sidelink communications according to aspects of the present disclosure is illustrated.

[0054] Figure 5 An example of a wireless communication system supporting a discontinuous reception mechanism for sidelink communications according to aspects of the present disclosure is illustrated.

[0055] Figure 6 and Figure 7A block diagram illustrating a device supporting a discontinuous reception mechanism for sidelink communications according to aspects of the present disclosure.

[0056] Figure 8 A block diagram illustrating a communication manager supporting a discontinuous reception mechanism for sidelink communications according to aspects of the present disclosure.

[0057] Fig. 9 A schematic diagram illustrating a system including a device supporting a discontinuous reception mechanism for sidelink communications according to aspects of the present disclosure.

[0058] Figures 10 to 13 A flow chart illustrating a method of supporting a discontinuous reception mechanism for sidelink communications according to aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0059] A wireless communication system may include multiple communication devices, such as UEs and base stations, which may provide wireless communication services to the UEs. For example, such a base station may be a next-generation NodeB or a Gigabit NodeB (either of which may be referred to as a gNB), which may support multiple radio access technologies, including 4G systems, such as 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 vehicle-to-everything (V2X) communication systems, vehicle-to-vehicle (V2V) communication systems, cellular V2X (C-V2X) communication systems, and the like. As demands for communication efficiency, reliability, and latency increase, wireless communication systems may wish to provide improvements to sidelink communications to support, among other things, higher reliability and low latency sidelink operations.

[0060] A UE may establish a sidelink connection with one or more other UEs in a wireless communication system, such as a V2X communication system. In some examples, the UE may support unicast communication, broadcast communication, or multicast communication, or a combination thereof. In order to provide improvements to sidelink communication (e.g., energy efficiency, power saving, etc.), the UE may be configured to support both DTX operation or DRX operation. For example, the UE may be configured with (e.g., receive or determine) a DTX configuration, or may be configured with (e.g., receive or determine) a DRX configuration or both. In some examples of unicast communication, a UE (e.g., a receiving UE) may receive a DTX configuration from another UE (e.g., a sending UE) via a connection (e.g., a sidelink connection), and the DTX configuration may identify a pattern of a DTX cycle associated with the UE (e.g., a receiving UE) (e.g., specific to the UE). The DTX cycle may include an active DTX duration, an inactive DTX duration, etc. As described herein. In some examples of broadcast communication and multicast communication, a UE (e.g., a sending UE) may broadcast or send a DTX configuration to all UEs or UE groups via multiple connections (e.g., multiple sidelink connections). Therefore, the DTX configuration may be common to all UEs or UE groups. That is, the DTX configuration may be the same for all UEs or UE groups, while in some examples, each UE may have different unicast services on the corresponding sidelink connection.

[0061] As part of DRX operation, the UE may determine a DRX configuration based on one or more received DTX configurations. The DRX configuration may indicate one or more DRX cycles, which may include an active DRX duration, an inactive DRX duration, etc., as described herein. Similarly, in some examples of unicast communications, the UE may send a DRX configuration to another UE via a connection (e.g., a sidelink connection), and the DRX configuration may identify a pattern of a DRX cycle associated with the UE (e.g., specific to the UE). In some examples of broadcast communications and multicast communications, the UE may send or broadcast a DRX configuration to all UEs or UE groups via multiple connections (e.g., multiple sidelink connections). Thus, the DRX configuration may be common to all UEs or UE groups. Therefore, for sidelink communications, as a result of providing a DTX configuration or a DRX configuration or both, the UE may save power.

[0062] Certain aspects of the subject matter described in the present disclosure may be implemented to achieve one or more of the following potential improvements. The techniques employed by the UE may provide benefits and enhancements to the operation of the UE. For example, operations performed by the UE may provide improvements to sidelink operations. In some examples, configuring the UE to support a DTX configuration or a DRX configuration or both for sidelink communications may support improvements to latency (e.g., reduced latency), power consumption, spectral efficiency, and in some examples, may facilitate improved efficiency of sidelink operations, among other benefits.

[0063] Aspects of the present disclosure are initially described in the context of a wireless communication system. Aspects of the present disclosure are then illustrated and described with reference to transmission timelines associated with DTX and DRX configurations for sidelink communications. Aspects of the present disclosure are further illustrated and described with reference to apparatus diagrams, system diagrams, and flow charts relating to DTX and DRX configurations for sidelink communications.

[0064] Various aspects of the present disclosure are initially described in the context of a wireless communication system. Various aspects of the present disclosure are further illustrated and described with reference to a transmission timeline. Various aspects of the present disclosure are further illustrated and described with reference to apparatus diagrams, system diagrams, and flow charts relating to a discontinuous reception mechanism for sidelink communications.

[0065] Figure 1 An example of a wireless communication system 100 supporting a discontinuous reception mechanism for sidelink communication according to 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 a long term evolution (LTE) network, an advanced LTE (LTE-A) network, an LTE-A Pro network, or a new radio (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.

[0066] The base stations 105 may be dispersed throughout a geographic area to form the wireless communication system 100, and may be devices in 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.

[0067] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary, mobile, or both at different times. The UEs 115 may be devices in different forms or with different capabilities. Figure 1 Some example UEs 115 are illustrated in FIG. The UEs 115 described herein can 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.

[0068] The base stations 105 may communicate with the core network 130 or 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 via the backhaul links 120 (e.g., via X2, Xn, or other interfaces) directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130), or both. In some examples, the backhaul links 120 may be or include one or more wireless links.

[0069] The one or more 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 station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next generation NodeB or a giga NodeB (any of which may be referred to as a gNB), a Home NodeB, a Home eNodeB, or other suitable terminology.

[0070] 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, etc. 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 may 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, etc., which may be implemented in various objects such as appliances or vehicles, meters, etc.

[0071] The UE 115 described herein is capable of communicating with various types of devices, such as other UEs 115 that may sometimes act as relays, as well as base stations 105 and network devices including macro eNBs or GNBs, small cell eNBs or GNBs, or relay base stations, such as Figure 1 shown.

[0072] The UE 115 and the base station 105 may communicate with each other wirelessly via one or more communication links 125 through one or more carriers. The term "carrier" may refer to a set 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 (e.g., bandwidth portion (BWP)) of a radio spectrum band operating according to one or more physical layer channels of 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 for coordinating carrier operations, 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. Depending on the carrier aggregation configuration, the UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used with frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0073] The signal waveform transmitted on the carrier may be composed of multiple subcarriers (e.g., using multi-carrier 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 element 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 element 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 elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate of UE 115. 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 further improve the data rate or data integrity of communications with UE 115.

[0074] 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, for example, T s =1 / (Δf max ·N f ) seconds sampling period, where Δf max It can represent the maximum supported subcarrier spacing, and N fThe 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).

[0075] 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 (e.g., in the time domain) into 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 pre-added to 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. In addition to 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.

[0076] A subframe, a time slot, a mini-time slot, or a 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)).

[0077] 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)) of a physical control channel may be defined by a plurality of symbol periods and may be extended across a system bandwidth 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 for control information in a control region according to one or more search space sets, and each search space set may include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. The aggregation level of a control channel candidate may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information of a control information format having a given payload size. A search space set may include a common search space set configured for delivering control information to a plurality of UEs 115, and a UE-specific search space set for sending control information to a specific UE 115.

[0078] In some examples, the base stations 105 may be mobile and, therefore, 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.

[0079] 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, such as 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 herein.

[0080] In some examples, UE 115 is also able to communicate directly with other UE 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 a geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105 or may not be able to receive transmissions from the base station 105. In some examples, a group of UEs 115 communicating via D2D communication may utilize a one-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 resource scheduling for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving the base station 105.

[0081] In some systems, the D2D communication link 135 can be an example of a communication channel between vehicles (e.g., UE 115), such as a sidelink communication channel. In some examples, vehicles can communicate using vehicle-to-everything (V2X) communications, vehicle-to-vehicle (V2V) communications, or some combination of these communications. 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 such as roadside units or with a network, or both, using vehicle-to-network (V2N) communications via one or more network nodes (e.g., base station 105).

[0082] The core network 130 may provide user authentication, access approval, 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 of UE 115 served by a base station 105 associated with the core network 130, such as mobility, authentication, and bearer management. 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.

[0083] Some network devices, such as base stations 105, may include subcomponents, such as access network entities 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 (Trp). 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).

[0084] The wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Typically, the region from 300 MHz to 300 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately 1 decimeter to 1 meter long. UHF waves may be blocked or redirected by buildings and environmental features, but these waves can penetrate structures sufficient 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 smaller frequencies and longer waves using the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0085] The wireless communication system 100 can utilize licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 can adopt license assisted access (LAA), 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 spectrum band, devices such as base stations 105 and UEs 115 can use carrier sensing for conflict detection and avoidance. In some examples, operations in unlicensed bands can be based on carrier aggregation configurations and component carriers operating in licensed bands (e.g., LAA). Operations in unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, etc.

[0086] The base station 105 or UE 115 may be equipped with multiple antennas that 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 that 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 geographic 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 communicating 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 of signals sent via the antenna ports.

[0087] 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 or 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 communicated 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. Adjustments to signals communicated 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. Adjustments associated with each antenna element 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).

[0088] 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 communication with the UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be sent multiple times by the base station 105 in different directions. For example, the base station 105 may send signals based on 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) a beam direction for later transmission or reception by the base station 105.

[0089] Some signals, such as data signals associated with a particular receiving device, may be transmitted 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, a beam direction associated with transmissions along a single beam direction may be determined based on signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signal received by UE 115 with the highest signal quality or other acceptable signal quality.

[0090] In some examples, transmissions by a device (e.g., 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 uncoded. 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-panel 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 to send signals multiple times in different directions (e.g., to identify a beam direction for subsequent transmission or reception by UE 115) or to send signals in a single direction (e.g., to send data to a receiving device).

[0091] When receiving various signals such as synchronization signals, reference signals, beam selection signals, or other control signals from the base station 105, a receiving device (e.g., UE 115) can try multiple reception configurations (e.g., directional listening). For example, the receiving device can try multiple reception directions by receiving via different antenna subarrays, by processing the received signals according to different antenna subarrays, by receiving according to different reception beamforming weight sets (e.g., different directional listening weight sets) applied to the signals received at multiple antenna elements of the antenna array, or by processing the received signals according to different reception beamforming weight sets applied to the signals received at multiple antenna elements of the antenna array, any of which can be referred to as "listening" according to different reception configurations or reception directions. In some examples, the receiving device can use a single reception configuration to receive along a single beam direction (e.g., when receiving a data signal). According to different reception configuration directions (e.g., the beam direction determined to have the highest signal strength, the highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions), the single reception configuration can be aligned in the beam direction determined based on listening.

[0092] In the illustrated example, the first UE 115 may receive a DTX configuration 210 for a side link connection between the first UE and the second UE from the second UE 115. In some examples, the first UE 115 may determine a set of receive beams used by the first UE 115 for discontinuous reception of the side link connection 205 based at least in part on the received DTX configuration 210. In some examples, the first UE 115 may send a DRX configuration 215 to the second UE 115, the DRX configuration 215 indicating the determined set of receive beams for discontinuous reception of the side link connection 205. In some examples, the first UE 115 may send an indication of at least one beam in the set of receive beams in the DRX configuration. In some examples, the first UE 115 may send an indication of time resources or frequency resources or both corresponding to one or more receive beams in the set of receive beams in the DRX configuration. In some examples, for a recurring set of discontinuous reception, the first UE 115 may send an indication of a time resource during which the first UE 115 will receive using each corresponding receive beam in the set of receive beams. In some examples, the first UE 115 may attempt to receive a transmission from the second UE 115 on the determined set of receive beams and on a corresponding set of opportunities during the recurring period of discontinuous reception. In some examples, the first UE 115 may receive a transmission from the second UE 115 on a receive beam in the set of receive beams during one of the sets of opportunities corresponding to the receive beam.

[0093] Figure 2 An example of a wireless communication system 200 that supports a discontinuous reception mechanism for sidelink communication according to aspects of the present disclosure is illustrated. In some examples, the wireless communication system 200 can implement aspects of the wireless communication system 100. For example, the wireless communication system 200 can support multiple 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 that can be referred to as an NR system. The wireless communication system 200 can also support sidelink communication between multiple UEs 115, such as sidelink communication between UE 115-a and UE 115-b, which can be referenced. Figure 1 Examples of corresponding devices described. Examples of sidelink communications may include D2D communications, V2X communication systems, V2V communication systems, etc. The wireless communication system 200 may also support improvements in power consumption, and in some examples, may facilitate high reliability and low latency sidelink communications, among other benefits.

[0094] UE 115-a and UE 115-b may be configured with multiple antennas that may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output communications, or beamforming, or any combination thereof. The antennas of UE 115-a and UE 115-b may be located within one or more antenna arrays or antenna panels that may support multiple-input multiple-output operations or transmit or receive beamforming. UE 115-a may have an antenna array having multiple rows and columns of antenna ports that UE 115-a may use to support beamforming for communications (e.g., sidelink communications) with UE 115-b or multiple other UEs. Similarly, UE 115-b may have one or more antenna arrays that may support various multiple-input multiple-output or beamforming operations for communications (e.g., sidelink communications) with UE 115-a or multiple other UEs. Additionally or alternatively, the antenna panel may support radio frequency beamforming of signals sent via one or more antenna ports. Thus, UE 115-a and UE 115-b may be configured to support directional sidelink communications using multiple antennas.

[0095] UE 115-a or UE 115-b or both in the wireless communication system 200 may support operations to reduce delays, such as reducing delays associated with indicating a new data session for UE 115-b from UE 115-a during a DRX ON period. In some examples, UE 115-a or UE 115-b or both in the wireless communication system 200 may support operations to preserve resources (e.g., time resources and frequency resources of the wireless communication system 200), battery life of UE 115-a or UE 115-b or both, etc. In some examples, UE 115-a or UE 115-b or both may be configured to support operations to manage or improve sidelink communications of a sidelink connection 205 between UE 115-a and UE 115-b. For example, UE 115-a or UE 115-b or both may be configured to support DTX operations or DRX operations, or both, for sidelink communications of the sidelink connection 205.

[0096] The sidelink connection 205 can be an example of a communication channel, such as a sidelink communication channel between vehicles (e.g., UE 115). The sidelink communication channel can correspond to a PC5 interface between UE 115-a and UE 115-b. The PC5 interface can facilitate direct communication between at least two UEs without involving network infrastructure (e.g., a base station, etc. (e.g., an eNB, a next-generation NodeB, or a gigabit NodeB (any of which can be referred to as a gNB))). The PC5 interface can also be a one-to-many communication interface (i.e., can be designated for group communication).

[0097] In some examples, UE 115-a and UE 115-b may perform a connection procedure (e.g., a sidelink connection procedure) to establish sidelink connection 205. For example, UE 115-a and UE 115-b may perform a sidelink connection establishment procedure to establish sidelink connection 205. As part of the sidelink connection procedure, UE 115-a may determine a DTX configuration 210 for sidelink connection 205, and DTX configuration 210 may be used for (e.g., dedicated to, specific to) sidelink connection 205. In some other examples, UE 115-a may determine DTX configuration 210 prior to the sidelink connection procedure. DTX configuration 210 may indicate a pattern of one or more DTX cycles, which may include a timing offset (e.g., a slot offset, a frame offset), a periodicity of one or more DTX cycles, an active DTX duration, an inactive DTX duration, or any combination thereof.

[0098] In some examples, UE 115-a may determine one or more of a timing offset (e.g., a slot offset, a frame offset), a periodicity of one or more DTX cycles, an active DTX duration, an inactive DTX duration, or any combination thereof based in part on expected data traffic (e.g., traffic load) on the sidelink connection 205. For example, UE 115-a may determine one or more of a timing offset (e.g., a slot offset, a frame offset), a periodicity of one or more DTX cycles, an active DTX duration, an inactive DTX duration, or any combination thereof based in part on a DRB configuration including a mapping and a quasi-co-location indicator (PQI). As part of the sidelink connection process, UE 115-a may provide DTX configuration 210 to UE 115-b. In some examples, the sidelink connection establishment process may be an RRC sidelink connection establishment process, and UE 115-a may provide DTX configuration 210 in an RRC configuration message.

[0099] As part of the sidelink connection process, UE 115-b may receive a DTX configuration 210 from UE 115-a. In some examples, UE 115-b may determine a DRX configuration 215 for sidelink connection 205 based in part on the DTX configuration 210. DRX configuration 215 may be specific to sidelink connection 205. In some examples, DRX configuration 215 may indicate a pattern of one or more DRX cycles, which may include a timing offset (e.g., a slot offset, a frame offset), a periodicity of one or more DRX cycles, an active DRX duration, an inactive DRX duration, or any combination thereof. In this way, UE 115-b (e.g., a receiving UE) may derive one or more DRX cycles based on the DTX configuration 210 from UE 115-a (e.g., a transmitting UE). As part of the sidelink connection process, UE 115-b may provide DRX configuration 215 to UE 115-a. In some examples, the sidelink connection establishment procedure can be an RRC sidelink connection establishment procedure, and UE 115-b can provide the DRX configuration 215 in an RRC configuration message.

[0100] In the illustrated example, DTX configuration 210 and DRX configuration 215 may be separate. Additionally or alternatively, DTX configuration 210 and DRX configuration 215 may be specific to a given sidelink connection, such as sidelink connection 205 (e.g., a sidelink connection between a particular set of UEs, such as UEs 115-a and 115-b). In some examples, a UE participating in multiple sidelink connections with multiple UEs (also referred to as peer UEs) may have separate DTX and DRX configurations (e.g., separate DTX configurations and separate DRX configurations) specific to each of the multiple sidelink connections of the UE with each of the multiple UEs.

[0101] In some examples, communication over the side link connection 205 may occur within a frequency range (e.g., frequency range 2, a millimeter wave band between 24.25 and 52.6 GHz, etc.). In the illustrated example, UE 115-b may receive a DTX configuration 210 for a side link connection between a first UE and a second UE from UE 115-a. In some examples, UE 115-a may determine a set of receive beams for discontinuous reception of the side link connection 205 by UE 115-a based at least in part on the received DTX configuration 210. In some examples, UE 115-a may send a DRX configuration 215 to UE 115-b, which indicates the determined set of receive beams for discontinuous reception of the side link connection 205. In some examples, UE 115-a may send an indication of at least one beam in the set of receive beams in the DRX configuration. In some examples, UE 115-a may send an indication of time resources or frequency resources or both corresponding to one or more receive beams in a receive beam set in a DRX configuration. In some examples, for a cycle set of discontinuous reception, UE 115-a may send an indication of time resources during which UE 115-a will use each corresponding receive beam in the receive beam set for reception. In some examples, UE 115-a may attempt to receive a transmission from UE 115-b on a determined receive beam set and on a corresponding set of opportunities during the cycle of discontinuous reception. In some examples, UE 115-a may receive a transmission from UE 115-b on one of the receive beams in the receive beam set and during one of the opportunities in the opportunity set corresponding to the receive beam.

[0102] By supporting one or more of DTX configuration 210 or DRX configuration 215, or both, for sidelink communications associated with sidelink connection 205, UE 115-a and UE 115-b may experience power savings and other benefits. Figure 2In the example of , the side link connection process can be a unicast RRC side link connection establishment process. In this way, the exchange of DTX configuration 210 and DRX configuration 215 can be performed via unicast communication.

[0103] Figure 3 An example of a transmission timeline 300 supporting a discontinuous reception mechanism for sidelink communications according to aspects of the present disclosure is illustrated. In some examples, the transmission timeline 300 can implement aspects of the wireless communication system 100. For example, the transmission timeline 300 can be based on a configuration of the UE 115 and implemented by the UE 115. The transmission timeline 300 can be applicable to implementations or instances when the UE 115 is configured with sidelink communications such as sidelink communications in V2X and V2V communication systems. In some examples, the transmission timeline 300 can be applicable to implementations or instances when the UE 115 is configured with a DRX configuration for sidelink communications such as sidelink communications in V2X and V2V communication systems.

[0104] exist Figure 3 In the illustrated example, transmission timeline 300 may include sidelink communications between UE 115-a and UE 115-b, which may be reference UEs 115-a and 115-b. Figures 1 to 4 An example of a corresponding device described. The sidelink communication between UE 115-a and UE 115-b can be an example of a unicast communication including a single sidelink connection for both UEs 115 (e.g., UE 115-a and UE 115-b). UE 115-a or UE 115-b or both can carry sidelink communication (e.g., in FDD mode) or can be configured to carry sidelink communication (e.g., in TDD mode). The transmission timeline 300 may include a DTX timeline 305 associated with UE 115-a. The DTX timeline 305 may include one or more DTX active durations 310 (also referred to as DTX ON durations). The DTX active duration 310 may correspond to a time resource (e.g., a symbol, a mini-slot, a time slot, a subframe, a frame) and a frequency resource (e.g., a subcarrier, a carrier). The transmission timeline 300 may include a DTX timeline 315 associated with UE 115-b. The DTX timeline 315 may include one or more DTX active durations 320 and one or more DTX inactive durations 325 (where the UE 115-b is operating in a low power mode). The DTX active durations 320 and the DTX inactive durations 325 may correspond to time resources (e.g., symbols, mini-slots, time slots, subframes, frames) and frequency resources (e.g., subcarriers, carriers).

[0105] The transmission timeline 300 may include a DRX timeline 330 associated with the UE 115-a. The DRX timeline 330 may include one or more DRX active durations 335 (also referred to as DRX ON durations). The DRX active durations 335 may correspond to time resources (e.g., symbols, mini-slots, time slots, subframes, frames) and frequency resources (e.g., subcarriers, carriers). The transmission timeline 300 may include a DRX timeline 340 associated with the UE 115-b. The DRX timeline 340 may include one or more DRX active durations 345 and one or more DRX inactive durations 350 (where the UE 115-b is operating in a low power mode). The DRX active durations 345 and the DRX inactive durations 350 may correspond to time resources (e.g., symbols, mini-slots, time slots, subframes, frames) and frequency resources (e.g., subcarriers, carriers).

[0106] In some examples, UE 115-a and UE 115-b may send or receive various communication content (e.g., control information, data) in an asymmetric manner. In other words, in the context of DTX timelines 305, 315 or DRX timelines 330, 340, or both, the traffic associated with UE 115-a and UE 115-b may be asymmetric. For example, UE 115-a may generate and send information (e.g., packets) every 320ms, while UE 115-b may generate and send information (e.g., packets) every 64ms. In some examples, UE 115-a or UE 115-b or both may be configured to adopt an operating mode that reduces power consumption, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception, but not simultaneous transmission and reception). For example, UE 115-a or UE 115-b or both may be configured (e.g., scheduled) with a time division duplex (TDD) configuration. In some examples, UE 115-a or UE 115-b or both may be configured (e.g., scheduled) with a TDD configuration to manage half-duplex communications between UE 115-a and UE 115-b. Thus, sidelink communications between UE 115-a and UE 115-b may be divided in the time domain. In other words, at one moment in time, UE 115-a or UE 115-b may send or receive information (e.g., packets) via a connection (e.g., a sidelink connection) between UE 115-a and UE 115-b.

[0107] UE 115-a or UE 115-b or both may determine a DRX configuration associated with DRX timelines 330, 340 based in part on the DTX configuration. For example, a DTX configuration associated with UE 115-a and used for a connection between UE 115-a and UE 115-b may drive a DRX configuration at a peer UE (e.g., UE 115-b). Similarly, a DTX configuration associated with UE 115-b and used for a connection between UE 115-a and UE 115-b may drive a DRX configuration at a peer UE (e.g., UE 115-a). For example, and as described in reference to Figures 2 to 4 As described, UE 115-a and UE 115-b may perform a connection procedure (e.g., an RRC connection establishment procedure) to establish or improve a connection (e.g., a sidelink connection) between UE 115-a and UE 115-b. During the connection procedure, UE 115-a may provide a DTX configuration that may indicate a DTX pattern (e.g., a DTX cycle) of 320ms. Additionally or alternatively, the DTX configuration may indicate one or more of a DTX timing offset, a DTX active duration, a DTX inactive duration, or any combination thereof. Similarly, during the connection procedure, UE 115-b may provide a DTX configuration that may indicate a DTX pattern (e.g., a DTX cycle) of 64ms. Additionally or alternatively, the DTX configuration may indicate one or more of a DTX timing offset, a DTX active duration, a DTX inactive duration, or any combination thereof.

[0108] Based on the exchange of DTX configurations, UE 115-a and UE 115-b may negotiate (e.g., determine) a DTX timing offset. Figure 3 In the example of , the DRX configuration determination can be based on the DTX configuration of the peer UE (e.g., UE 115-a or UE 115-b). That is, the DRX configuration of UE 115-a can be based on the DTX configuration of UE 115-b (e.g., the DRX configuration of UE 115-a is equal to (or corresponds to) the DTX configuration of UE 115-b). Similarly, the DRX configuration of UE 115-b can be based on the DTX configuration of UE 115-a (e.g., the DRX configuration of UE 115-b is equal to (or corresponds to) the DTX configuration of UE 115-a). Therefore, the DTX configuration for the connection (e.g., the sidelink connection) drives the DRX configuration at the peer UE.

[0109] Figure 4An example of a wireless communication system 400 that supports a discontinuous reception mechanism for sidelink communication according to aspects of the present disclosure is illustrated. In some examples, the wireless communication system 400 can implement aspects of the wireless communication system 100. For example, the wireless communication system 400 can support multiple 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 that can be referred to as an NR system. The wireless communication system 400 can also support sidelink communication between multiple UEs 115, such as sidelink communication between UE 115-c, UE 115-d, and UE 115-e, which can be referenced. Figure 1-Figure 3 Examples of corresponding devices described. Examples of sidelink communications may include D2D communications, V2X communication systems, V2V communication systems, etc. The wireless communication system 400 may also support improvements in power consumption, and in some examples, may facilitate high reliability and low latency sidelink communications, among other benefits.

[0110] exist Figure 4 In the illustrated example, UE 115-c may be a receiving UE, and UE 115-d and UE 115-e may be transmitting UEs. In the illustrated example, UE 115-c may be synchronized with UE 115-d and UE 115-e. In some examples, one or more of UE 115-c, UE 115-d, and UE 115-e may perform beamforming access on frequency range 2.

[0111] Before or during a first time period (e.g., T0 before T1), UE 115-c may be synchronized with UE 115-d. Similarly, before or during the first time period, UE 115-c may be synchronized with UE 115-e. Before or during the first time period, UE 115-d may conduct DTX-DRX negotiation with UE 115-c. Similarly, before or during the first time period, UE 115-d may conduct DTX-DRX negotiation with UE 115-c. In some examples, the DTX-DRX negotiation may include UE 115-d or UE 115-e or both delivering a DTX configuration to UE 115-c. In some examples, DTX-DRX negotiation may include UE 115-c delivering a DRX configuration to UE 115-d or UE 115-e, or both (e.g., broadcasting to both UE 115-d and UE 115-e simultaneously, or sending to UE 115-d and UE 115-e via separate transmissions).

[0112] In the illustrated example, during the second time period (e.g., T1), UE 115-d can complete a data session with UE 115-c (e.g., the data session is completed during the second time period or before the second time period occurs). As shown, UE 115-c can detect and receive transmissions from UE 115-d via receive beam 405, and can detect and receive transmissions from UE 115-e via receive beam 415. As shown, UE 115-d can send data to UE 115-c via transmit beam 410. In some examples, UE 115-e can send data to UE 115-c via a transmit beam directed toward receive beam 415 (e.g., based on a DTX mode or configuration of UE 115-e).

[0113] During a third time period (e.g., T1+t'), UE 115-c may determine that UE 115-e has no more data to send to UE 115-c (e.g., based on a timeout, etc.). In some examples, based on UE 115-c determining that UE 115-e has no more data to send, UE 115-c may stop listening to UE 115-e (e.g., deactivate receive beam 415). In some examples, UE 115-c may stop listening to UE 115-e to save power.

[0114] During a fourth time period (e.g., T2), UE 115-e may have new data to send to UE 115-c (e.g., a new data session with UE 115-c). However, because UE 115-c deactivated receive beam 415 during the third time period, UE 115-e may not be configured to communicate new data to UE 115-c using a previous or abandoned DTX mode. Even if UE 115-e is configured with a DTX mode between UE 115-c and UE 115-d, UE 115-e may not be able to send new data to UE 115-c using the DTX mode between UE 115-c and UE 115-d because the receive beam 405 monitored by UE 115-c may not be directed toward UE 115-e. In some examples, beam discovery may be relatively infrequent. Therefore, UE 115-e may experience a high delay penalty for new data. The described techniques may enable a UE 115 - e to indicate a new data session for beamforming access.

[0115] In some examples, UE 115-c may determine a set of receive beams for discontinuous reception of a sidelink connection of UE 115-c with one or more peers (e.g., UE 115-d, UE 115-e, etc.) based at least in part on a received discontinuous transmission configuration. In some examples, UE 115-c may send a DRX configuration 215 to UE 115-d or UE 115-e or both, indicating the determined set of receive beams for discontinuous reception of sidelink connection 205. In some examples, UE 115-c may send an indication of at least one beam in the set of receive beams in the DRX configuration. In some examples, UE 115-c may send an indication of time resources or frequency resources or both corresponding to one or more receive beams in the set of receive beams in the DRX configuration. In some examples, for a recurring set of discontinuous reception, UE 115-c may send an indication of time resources during which UE 115-c will receive using each corresponding receive beam in the set of receive beams. In some examples, UE 115-c may attempt to receive a transmission from UE 115-d or UE 115-e, or both, on the determined set of receive beams at a corresponding set of opportunities during the recurring period of discontinuous reception. In some examples, UE 115-c may receive a transmission from UE 115-d or UE 115-e on a receive beam in the set of receive beams during one of the opportunities in the set of opportunities corresponding to the receive beam.

[0116] Figure 5 An example of a wireless communication system 500 supporting a discontinuous reception mechanism for sidelink communication according to aspects of the present disclosure is shown. In some examples, the wireless communication system 500 can implement aspects of the wireless communication system 100. For example, the wireless communication system 500 can support multiple 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 that can be referred to as an NR system. The wireless communication system 500 can also support sidelink communications between multiple UEs 115, such as sidelink communications between UEs 115-f, UEs 115-g, UEs 115-h, and UEs 115-i, which can be referenced. Figures 1 to 4 Examples of corresponding devices described. Examples of sidelink communications may include D2D communications, V2X communication systems, V2V communication systems, etc. The wireless communication system 500 may also support improvements in power consumption, and in some examples, may facilitate high reliability and low latency sidelink communications, among other benefits.

[0117] exist Figure 5In the illustrated example, UE 115-f may be a receiving UE, and UE 115-g, UE 115-h, and UE 115-i may be transmitting UEs. In the illustrated example, UE 115-f may be synchronized with at least one of UE 115-g, UE 115-h, or UE 115-i, or any combination thereof. In some examples, one or more of UE 115-f, UE 115-g, UE 115-h, and UE 115-i may perform beamforming access on frequency range 2.

[0118] In the illustrated example, during a first time period (e.g., T1), UE 115-f can determine a DRX configuration update based on DTX information from one or more UE peers (e.g., UE 115-g, UE 115-h, or UE 115-i). As shown, UE 115-f can use receive beams 505, 515, and 520 to monitor transmissions from peer UEs. During the first time period, UE 115-f can actively monitor transmissions on receive beam 505, while receive beams 515 and 520 are inactive. In some examples, UE 115-f can notify the one or more UE peers during a DTX opportunity with one or more UE peers or during a DRXON period of the peer. As shown, UE 115-f can notify UE115-g of a DRX configuration update during the first time period. In some cases, UE 115-g can communicate 510 with UE115-f during a DTX opportunity or a DRX ON period. In the illustrated example, during the first time period, UE 115-i may determine that it has new data to send to UE 115-f. In some examples, UE 115-i may be configured with information about receive beams 505, 515, and 520. Based on this knowledge, UE 115-i may attempt to deliver at least a portion of a control message or a data message to UE 115-f and wait to receive feedback. However, the message from UE 115-i may not reach UE 115-f because, as shown, receive beam 515 may be inactive during the first time period.

[0119] In the illustrated example, during a second time period (e.g., T2), UE 115-f may notify UE 115-h of a DRX configuration update. During the second time period, UE 115-f may actively listen to transmissions on receive beam 520, while receive beams 505 and 515 are inactive. In some cases, UE 115-h may communicate 530 with UE 115-f during a DTX opportunity or a DRX ON period. In the illustrated example, during the second time period, UE 115-i may determine that it has new data to send to UE 115-f. Additionally or alternatively, UE 115-i may continue to attempt to indicate new data to UE 115-f during the second time period. In some examples, during the second time period, UE 115-i may attempt to deliver or re-deliver at least a portion of a control message or a data message to UE 115-f and wait to receive feedback. However, the message (or messages) from UE 115-i may not reach UE 115-f because, as shown, receive beam 515 may be inactive during the second time period.

[0120] In the illustrated example, during a third time period (e.g., T3), UE 115-f may notify UE 115-i of a DRX configuration update. During the third time period, UE 115-f may actively listen for transmissions on receive beam 515, while receive beams 505 and 520 are inactive. In some cases, UE 115-h may communicate 530 with UE 115-f during a DTX opportunity or a DRX ON period. In some examples, UE 115-i may send (e.g., communicate 530) an indication of new data. In some examples, UE 115-i may send an indication of data, an indication of control information, the data itself, or the control information itself to UE 115-f. Based on communication 530, UE 115-f is notified of new data from UE 115-i.

[0121] In some examples, UE 115-f may indicate one or more beam directions in a DRX configuration update. In some examples, UE 115-f may indicate at least one of a time resource or a frequency resource or a static time period or any combination thereof. In a third time period, UE 115-i may successfully send at least an indication of data, an indication of control, or the data itself or the control itself or any combination thereof to UE 115-f.

[0122] In some examples, UE 115-f may determine a DRX cycle (e.g., during an initial DTX-DRX configuration or update), and UE 115-f may notify all other peers (e.g., UE 115-g, UE 115-h, and UE 115-i) of the determined DRX cycle (e.g., via a DRX notification or DRX configuration notification message). In some examples, the DRX notification may indicate one or more beam directions that UE 115-f monitors during each DRX period.

[0123] In some examples, for each DRX cycle, UE 115-f may indicate specific time (or frequency, or time-frequency) resources on which UE 115-f performs beamforming in some directions. In some examples, the indicated time resources may include static time periods during which UE 115-f performs beamforming (e.g., the aforementioned data transmission) in one or more directions. In some examples, UE 115-f may perform beamforming in a dynamic manner on a set of beams.

[0124] In some examples, UE 115-f may determine one or more receive beam configurations (e.g., beam set-1, etc.) to communicate with peer UEs (e.g., UE 115-g, UE 115-h, and UE 115-i) on sidelink communications. In some examples, UE 115-f may assign a receive beam configuration index (RCI) corresponding to the receive beam configuration. In some examples, UE 115-f may indicate the RCI to the peer UEs (e.g., UE 115-g, UE 115-h, and UE 115-i). In some examples, UE 115-f may form receive beams (e.g., b0, b1, b2, b3) and determine that it is able to receive transmissions from its peers (e.g., UE 115-g, UE 115-h, or UE 115-i) using beams b0 and b1 but not b2 and b3. In some examples, UE 115-f may determine that beam b0 is better than b1. In this example, UE 115-f may allocate RCI-0 corresponding to receive beam b0 and indicate to a peer UE (e.g., UE 115-g, UE 115-h, or UE 115-i) that UE 115-f is using RCI-0 for default communication with the peer UE.

[0125] In some examples, UE 115-f may indicate one or more DRX configurations to a peer UE (e.g., UE 115-g, UE 115-h, or UE 115-i). In some examples, each of the multiple DRX configurations may include a receive beam configuration that UE 115-f uses to receive during the DRX ON duration. In some examples, each of the multiple DRX configurations may include a DRX period, or a frame offset, or a time slot offset, or an ON duration, or an RCI that UE 115-f intends to use during the DRX ON duration, or any combination thereof. In some examples, one RCI is indicated for the entire ON duration. In some examples, one or more RCIs are indicated during a subset of time slots within the ON duration (e.g., b0 during 1100000000, b1 during 0011110000, b2 during 0000001111, and so on)

[0126] In some examples, UE 115-f may indicate to a peer UE (e.g., UE 115-g, UE 115-h, or UE 115-i) at least a second receive beam configuration (e.g., beam set-2 in addition to beam set-1). In some examples, UE 115-f may still receive from the peer UE during the DRX ON duration on beams in beam set-2 for purposes of reestablishing the connection. In some examples, a peer UE (e.g., UE 115-g, UE 115-h, or UE 115-i) may indicate to UE 115-f that it may be able to listen on RCI-1 (e.g., associated with the second receive beam configuration) in addition to RCI-0. In some examples, RCI-1 may be an index corresponding to a suboptimal receive beam (e.g., a wider beam), but a beam with which UE 115-f may still be able to communicate. In some examples, the beam of the second beam configuration may not be the preferred beam for communicating with the peer UE, but if the peer UE determines to deliver data or re-establish a connection during the DRX ON duration, the peer UE can be enabled to deliver data based on the first receive beam configuration and the second receive beam configuration, regardless of whether the receive beam is RCI-0 or RCI-1.

[0127] In some examples, UE 115-f can indicate in the DRX configuration an expected degradation in quality of service when using additional beams of a second beam configuration (e.g., beam set-2, RCI-1) as compared to a preferred beam of a first beam configuration (e.g., beam set-1) for sidelink communications with a peer. In some examples, the DRX configuration can indicate that the peer UE should expect a certain level (e.g., x decibels) of signal-to-noise ratio loss. In some examples, when sending a signal to UE 115-f using the second beam configuration, the peer UE can increase the transmit power or downgrade the modulation and coding scheme, or both.

[0128] In some examples, UE 115-i may attempt to deliver a control message or a data message, or both, using a beam aligned with one of the beams indicated in the DRX configuration from UE 115-f. In some examples, UE 115-i may receive feedback using a beam aligned with one of the beams indicated in the DRX configuration from UE 115-f. In some examples, UE 115-i that was previously configured with a receive beam configuration from UE 115-f may attempt to signal an indication of new data to be sent in resources (e.g., time or frequency resources, or both) indicated in the DRX configuration, regardless of whether the beam alignment satisfies a certain beam alignment threshold.

[0129] In some examples, UE 115-i may send multiple copies of a control message or a data message, or both, until UE 115-i determines that the transmission was successfully received by UE 115-f (e.g., via feedback from UE 115-f, where the feedback may be in the form of a HARQ ACK or some RRC response or update message). In some examples, UE 115-i sending multiple copies of a control message or a data message, or both, may trigger a DTX-DRX configuration update. In some examples, an update to DRX of UE 115-f may be sent to a peer UE (e.g., UE 115-g, UE 115-h, or UE 115-i) during a DTX opportunity with the peer UE. In some examples, UE 115-f may send the DRX configuration during an upcoming DRX ON period with the peer.

[0130] In some examples, UE 115-i may deliver a radio resource control connection reconfiguration message (e.g., only deliver the radio resource control connection reconfiguration message) to trigger a DTX-DRX configuration update. In some examples, the radio resource control connection reconfiguration message may include a new DTX configuration for a new data session for which UE 115-i has prepared data to send to UE 115-f. In some examples, UE 115-f, after receiving the radio resource control connection reconfiguration message from UE 115-i, may deliver a second radio resource control connection reconfiguration message (e.g., a DRX configuration notification message) to UE 115-i to indicate a new DRX cycle. In some examples, UE 115-f may request UE 115-i to apply an offset to its new DTX configuration. In some examples, UE 115-f may deliver an updated DRX configuration to UE 115-i using a second radio resource control connection reconfiguration message.

[0131] In some examples, UE 115-i may deliver a data packet (e.g., only a data packet) to trigger a DTX-DRX configuration update. In some examples, UE 115-f may blindly decode the data packet and deliver an ACK / NACK response to UE 115-i. In some examples, UE 115-i may deliver both a radio resource control connection reconfiguration message and a data packet or at least a portion of a data packet to trigger a DTX-DRX configuration update. When UE 115-i does not receive a response from UE 115-f, UE 115-i may perform one or more retransmissions of the data packet or the radio resource control connection reconfiguration message or both.

[0132] Figure 6 A block diagram 600 of a device 605 supporting a discontinuous reception mechanism for sidelink communications according to aspects of the present disclosure is shown. The device 605 may be an example of aspects of a UE 115 as described herein. The device 605 may include a receiver 610, a communication manager 615, and a transmitter 620. The device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0133] The receiver 610 may receive information associated with various information channels (e.g., control channels, data channels, and information related to a discontinuous reception mechanism for sidelink communication, etc.), such as packets, user data, or control information. The information may be delivered to other components of the device 605. The receiver 610 may be a reference Fig. 9 Examples of aspects of transceiver 920 are described. Receiver 610 may utilize a single antenna or a collection of antennas.

[0134] The communication manager 615 may receive a discontinuous transmission configuration for a sidelink connection between the first UE and the second UE from the second UE, determine a set of receive beams for discontinuous reception of the sidelink connection by the first UE based on the received discontinuous transmission configuration, and send a discontinuous reception configuration indicating the determined set of receive beams for discontinuous reception of the sidelink connection to the second UE. The communication manager 615 may also send a discontinuous transmission configuration for a sidelink connection between the first UE and the second UE to the first UE, receive a discontinuous reception configuration for the sidelink connection from the first UE, the discontinuous reception configuration indicating the set of receive beams for discontinuous reception of the sidelink connection by the first UE based on the sent discontinuous transmission configuration, and send signaling to the first UE using the sidelink connection according to the sent discontinuous transmission configuration and based on the received discontinuous reception configuration. The communication manager 615 may be an example of aspects of the communication manager 910 described herein.

[0135] The communication manager 615 or its subcomponents may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functionality of the communication manager 615 or its subcomponents may be executed 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.

[0136] The communication manager 615 or its subcomponents can be physically located in 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 communication manager 615 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 615 or its subcomponents can 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.

[0137] Transmitter 620 can transmit signals generated by other components of device 605. In some examples, transmitter 620 can be co-located with receiver 610 in a transceiver module. For example, transmitter 620 can be a reference Fig. 9 Examples of aspects of the transceiver 920 are described. The transmitter 620 may utilize a single antenna or a collection of antennas.

[0138] Figure 7A block diagram 700 of a device 705 supporting a discontinuous reception mechanism for sidelink communications according to aspects of the present disclosure is shown. The device 705 may be an example of aspects of the device 605 or UE 115 as described herein. The device 705 may include a receiver 710, a communication manager 715, and a transmitter 750. The device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0139] The receiver 710 may receive information associated with various information channels (e.g., control channels, data channels, and information related to a discontinuous reception mechanism for sidelink communication, etc.), such as packets, user data, or control information. The information may be delivered to other components of the device 705. The receiver 710 may be a reference Fig. 9 Examples of aspects of the transceiver 920 are described. The receiver 710 may utilize a single antenna or a collection of antennas.

[0140] The communication manager 715 may be an example of aspects of the communication manager 615 as described herein. The communication manager 715 may include a side link manager 720, a configuration manager 725, an update manager 730, a connection manager 735, a beam manager 740, and a signaling manager 745. The communication manager 715 may be an example of aspects of the communication manager 910 described herein.

[0141] The side link manager 720 may receive a discontinuous transmission configuration for a side link connection between the first UE and the second UE from the second UE. The configuration manager 725 may determine a set of reception beams for discontinuous reception of the side link connection by the first UE based on the received discontinuous transmission configuration. The update manager 730 may send a discontinuous reception configuration to the second UE, the discontinuous reception configuration indicating the determined set of reception beams for discontinuous reception of the side link connection.

[0142] The connection manager 735 may send a discontinuous transmission configuration for a side link connection between the first UE and the second UE to the first UE. The beam manager 740 may receive a discontinuous reception configuration for the side link connection from the first UE, the discontinuous reception configuration indicating a set of reception beams used by the first UE for discontinuous reception of the side link connection based on the sent discontinuous transmission configuration. The signaling manager 745 may send signaling to the first UE using the side link connection based on the sent discontinuous transmission configuration and based on the received discontinuous reception configuration.

[0143] Transmitter 750 can transmit signals generated by other components of device 705. In some examples, transmitter 750 can be co-located with receiver 710 in a transceiver module. For example, transmitter 750 can be a reference Fig. 9Examples of aspects of the transceiver 920 are described. The transmitter 750 may utilize a single antenna or a collection of antennas.

[0144] Figure 8 A block diagram 800 of a communication manager 805 supporting a discontinuous reception mechanism for sidelink communications according to aspects of the present disclosure is shown. The communication manager 805 may be an example of aspects of the communication manager 615, the communication manager 715, or the communication manager 910 described herein. The communication manager 805 may include a sidelink manager 810, a configuration manager 815, an update manager 820, a resource manager 825, a connection manager 830, a beam manager 835, a signaling manager 840, and a mode manager 845. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

[0145] The side link manager 810 may receive a discontinuous transmission configuration for a side link connection between the first UE and the second UE from the second UE. In some examples, the side link manager 810 may attempt to receive a transmission from the second UE on a determined set of receive beams and a corresponding set of opportunities during a discontinuous reception cycle. In some examples, the side link manager 810 may receive a transmission from the second UE on one of the receive beams in the set of receive beams and during one of the opportunities in the set of opportunities corresponding to the receive beam.

[0146] In some examples, a first radio resource control connection reconfiguration message is received from a second UE via a side link connection, wherein the first radio resource control connection reconfiguration message includes a discontinuous transmission configuration. In some examples, the side link manager 810 may send a second radio resource control connection reconfiguration message to the second UE based on the first radio resource control connection reconfiguration message from the second UE. In some examples, the side link manager 810 may send a request to apply an offset to the discontinuous transmission configuration to the second UE based on the first radio resource control connection reconfiguration message from the second UE.

[0147] The configuration manager 815 can determine a set of receive beams for discontinuous reception of a sidelink connection by the first UE based on the received discontinuous transmission configuration. In some examples, a first index corresponding to the receive beam configuration of the discontinuous reception configuration is assigned to the second UE, wherein the discontinuous reception configuration includes the receive beam configuration and the first assignment index.

[0148] In some examples, the configuration manager 815 can identify a set of receive beams that the first UE is configured to form. In some examples, the configuration manager 815 can determine to use a first receive beam and a second receive beam in the set of receive beams to receive a transmission from the second UE, wherein the receive beam configuration indicates the first receive beam and the second receive beam.

[0149] In some examples, the configuration manager 815 can identify that the first receive beam is superior to the second receive beam, wherein the first allocation index corresponds to the first receive beam based on the first receive beam being superior to the second receive beam. In some examples, the configuration manager 815 can allocate a second index corresponding to a second receive beam configuration of a discontinuous reception configuration to the second UE, wherein the discontinuous reception configuration includes the receive beam configuration, the first allocation index, and the second allocation index, and wherein the second UE can use the first allocation index or the second allocation index to reestablish a connection with the first UE.

[0150] In some examples, the configuration manager 815 can indicate to the second UE that the second allocation index includes a decrease in quality of service relative to the first allocation index. In some cases, the first allocation index is indicated for the entire discontinuous reception ON duration. In some cases, the first allocation index is indicated for a first duration of the discontinuous reception ON duration, and the second index is indicated for a second duration of the discontinuous reception ON duration, the second index pointing to a second receive beam configuration of the discontinuous reception configuration.

[0151] In some cases, the discontinuous reception configuration includes a discontinuous reception period, or a frame offset, or a time slot offset, or a discontinuous reception ON duration, or an indication of an index of a receive beam configuration of the discontinuous reception configuration selected by the first UE for use during the discontinuous reception ON duration, or a combination thereof.

[0152] The update manager 820 may send a discontinuous reception configuration to the second UE, the discontinuous reception configuration indicating a determined set of receive beams for discontinuous reception of the sidelink connection. In some examples, the update manager 820 may send an indication of at least one beam in the set of receive beams. In some examples, the update manager 820 may send a set of discontinuous reception configurations to the second UE, including the discontinuous reception configurations, wherein each of the set of discontinuous reception configurations includes a receive beam configuration that the first UE will use during a single discontinuous reception ON duration of the second UE.

[0153] In some cases, the discontinuous reception configuration is sent to the second UE during the discontinuous transmission occasion indicated in the received discontinuous transmission configuration. In some cases, the discontinuous reception configuration is sent to the second UE during the discontinuous reception ON duration of the second UE.

[0154] The connection manager 830 may send a discontinuous transmission configuration for a sidelink connection between the first UE and the second UE to the first UE. In some examples, the connection manager 830 may use the first reception index or the second reception index to reestablish the connection with the first UE. In some examples, the connection manager 830 may send a first instance of the message in a first beam direction indicated in the discontinuous reception configuration. In some examples, the connection manager 830 may send a second instance of the message in a second beam direction indicated in the discontinuous reception configuration based on receiving negative feedback or not receiving feedback for the first instance.

[0155] In some examples, connection manager 830 may receive positive feedback for the message. In some examples, connection manager 830 may bypass sending a third instance of the message in a third beam direction based on receiving the positive feedback.

[0156] In some examples, the connection manager 830 may send a first radio resource control connection reconfiguration message to the first UE using the sidelink connection, wherein the first radio resource control connection reconfiguration message includes a discontinuous transmission configuration. In some examples, the connection manager 830 may receive a second radio resource control connection reconfiguration message from the first UE based on sending the first radio resource control connection reconfiguration message to the first UE.

[0157] In some examples, the connection manager 830 may receive a request from the first UE to apply an offset to the discontinuous transmission configuration based on sending a first radio resource control connection reconfiguration message to the first UE.

[0158] In some examples, the connection manager 830 may send a data packet to the first UE using the side link connection. In some examples, the connection manager 830 may receive an acknowledgment feedback indicating a negative acknowledgment or no acknowledgment from the first UE. In some examples, the connection manager 830 may retransmit the data packet to the first UE using the side link connection based on the received acknowledgment feedback.

[0159] In some examples, the connection manager 830 may receive a radio resource control connection reconfiguration message from the first UE at least in part in response to a retransmission of the data packet. In some examples, the connection manager 830 may send a first radio resource control connection reconfiguration message and at least a portion of the data packet to the first UE using a sidelink connection. In some examples, the connection manager 830 may receive a second radio resource control connection reconfiguration message from the first UE based on the first radio resource control connection reconfiguration message or at least a portion of the data packet.

[0160] The beam manager 835 may receive a discontinuous reception configuration for a side link connection from the first UE based on the transmitted discontinuous transmission configuration, the discontinuous reception configuration indicating a set of receive beams used by the first UE for discontinuous reception of the side link connection. In some examples, the beam manager 835 may identify a transmit beam of the second UE corresponding to the receive beam of the first UE indicated in the discontinuous reception configuration, and the signaling is sent on the identified transmit beam.

[0161] The signaling manager 840 may send signaling to the first UE using the sidelink connection according to the transmitted discontinuous transmission configuration and based on the received discontinuous reception configuration.

[0162] The resource manager 825 may send an indication of time resources or frequency resources or both corresponding to one or more receive beams in the receive beam set. In some examples, for a cyclic set of discontinuous reception, the resource manager 825 may send an indication of time resources during which the first UE will receive using each corresponding receive beam in the receive beam set.

[0163] The mode manager 845 may determine, based on the discontinuous reception configuration, time resources or frequency resources or both corresponding to one or more receive beams in the receive beam set. In some examples, the mode manager 845 may receive a discontinuous reception configuration set from a first UE, including a discontinuous reception configuration, wherein each of the discontinuous reception configuration set includes a receive beam configuration that the first UE will use during a single discontinuous reception ON duration of a second UE.

[0164] In some examples, the mode manager 845 may receive a first index corresponding to a receive beam configuration of a discontinuous reception configuration from a first UE, wherein the discontinuous reception configuration includes a receive beam configuration and a first allocation index. In some examples, the mode manager 845 may receive a second index corresponding to a second receive beam configuration of the discontinuous reception configuration from the first UE.

[0165] In some examples, the mode manager 845 may determine that the second reception index includes a decrease in quality of service relative to the first reception index. In some examples, when using the second reception index to send a signal to the first UE, the mode manager 845 may increase the transmission power or degrade the modulation and coding scheme or both. In some cases, the discontinuous reception configuration is received during the discontinuous transmission opportunity indicated in the transmitted discontinuous transmission configuration. In some cases, the discontinuous reception configuration is received during the discontinuous reception ON duration of the second UE.

[0166] Fig. 9A schematic diagram of a system 900 including a device 905 supporting a discontinuous reception mechanism for sidelink communications according to aspects of the present disclosure is shown. The device 905 may be an example of or include components of a device 605, a device 705, or a UE 115 as described herein. The device 905 may include components for two-way voice and data communications including components for sending and receiving communications, including a communication manager 910, an I / O controller 915, a transceiver 920, an antenna 925, a memory 930, and a processor 940. These components may communicate electronically via one or more buses (e.g., a bus 945).

[0167] The communication manager 910 may receive a discontinuous transmission configuration for a sidelink connection between a first UE and a second UE from a second UE, determine a receive beam set for discontinuous reception used by the first UE for the sidelink connection based on the received discontinuous transmission configuration, and send a discontinuous reception configuration indicating the determined receive beam set for discontinuous reception of the sidelink connection to the second UE. The communication manager 910 may also send a discontinuous transmission configuration for a sidelink connection between the first UE and the second UE to the first UE, receive a discontinuous reception configuration for the sidelink connection from the first UE, the discontinuous reception configuration indicating the receive beam set for discontinuous reception used by the first UE for the sidelink connection based on the sent discontinuous transmission configuration, and send signaling to the first UE using the sidelink connection according to the sent discontinuous transmission configuration and based on the received discontinuous reception configuration.

[0168] I / O controller 915 can manage input and output signals for device 905. I / O controller 915 can also manage peripheral devices that are not integrated into device 905. In some cases, I / O controller 915 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 915 can utilize an operating system, such as Or other known operating systems. In other cases, I / O controller 915 can represent or interact with a modem, keyboard, mouse, touch screen or similar device. In some cases, I / O controller 915 can be implemented as a part of a processor. In some cases, a user can interact with device 905 via I / O controller 915 or via hardware components controlled by I / O controller 915.

[0169] As described herein, transceiver 920 can communicate bidirectionally via one or more antennas, wired or wireless links. For example, transceiver 920 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. Transceiver 920 can also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0170] In some cases, a wireless device may include a single antenna 925. However, in some cases, a device may have more than one antenna 925, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0171] The memory 930 may include RAM and ROM. The memory 930 may store computer-readable, computer-executable code 935, including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, the memory 930 may include a BIOS, etc., which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0172] The processor 940 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a central processing unit (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, the processor 940 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 940. The processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 930) to cause the device 905 to perform various functions (e.g., functions or tasks that support cancellation of transmission opportunities).

[0173] The code 935 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code 935 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 935 may not be directly executable by the processor 940, but may enable a computer (e.g., when compiled and executed) to perform the functions described herein.

[0174] Fig.10 A flow chart illustrating a method 1000 for supporting a discontinuous reception mechanism for sidelink communications according to aspects of the present disclosure is shown. The operations of the method 1000 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1000 may be implemented by a UE 115 or a component thereof as described herein. Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described herein.

[0175] At 1005, the UE may receive a discontinuous transmission configuration for a sidelink connection between the first UE and the second UE from the second UE. The operations of 1005 may be performed according to the methods described herein. In some examples, aspects of the operations of 1005 may be described with reference to Figures 6 to 9 The side link manager described is executed.

[0176] At 1010, the UE may determine a group receive beam set for discontinuous reception of a sidelink connection by the first UE based on the received discontinuous transmission configuration. The operations of 1010 may be performed according to the methods described herein. In some examples, aspects of the operations of 1010 may be described with reference to Figures 6 to 9 Describes the configuration manager to perform.

[0177] At 1015, the UE may send a discontinuous reception configuration to the second UE, the discontinuous reception configuration indicating the determined set of receive beams for discontinuous reception of the side link connection. The operation of 1015 may be performed according to the methods described herein. In some examples, aspects of the operation of 1015 may be described with reference to Figures 6 to 9 Described by the update manager to perform.

[0178] Fig.11 A flow chart illustrating a method 1100 for supporting a discontinuous reception mechanism for sidelink communications according to aspects of the present disclosure is shown. The operations of the method 1100 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1100 may be implemented by a UE 115 or a component thereof as described herein. Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described herein.

[0179] At 1105, the UE may receive a discontinuous transmission configuration for a sidelink connection between the first UE and the second UE from the second UE. The operations of 1105 may be performed according to the methods described herein. In some examples, aspects of the operations of 1105 may be described with reference to Figures 6 to 9 The side link manager described is executed.

[0180] At 1110, the UE may determine a set of receive beams for discontinuous reception of a sidelink connection by the first UE based on the received discontinuous transmission configuration. The operations of 1110 may be performed according to the methods described herein. In some examples, aspects of the operations of 1110 may be described with reference to Figures 6 to 9 Describes the configuration manager to perform.

[0181] At 1115, the UE may send a discontinuous reception configuration to the second UE, the discontinuous reception configuration indicating the determined set of receive beams for discontinuous reception of the sidelink connection. The operation of 1115 may be performed according to the methods described herein. In some examples, aspects of the operation of 1115 may be described with reference to Figures 6 to 9 Described by the update manager to perform.

[0182] At 1120, the UE may send an indication of receiving at least one beam in the set of beams. The operations of 1120 may be performed according to the methods described herein. In some examples, aspects of the operations of 1120 may be described with reference to Figures 6 to 9 Described by the update manager to perform.

[0183] At 1125, the UE may send an indication of time resources or frequency resources or both corresponding to one or more receive beams in the receive beam set. The operations of 1125 may be performed according to the methods described herein. In some examples, aspects of the operations of 1125 may be described with reference to Figures 6 to 9 Describes the resource manager to execute.

[0184] At 1130, for a recurring set of discontinuous reception, the UE may send an indication of a time resource during which the first UE will receive using each corresponding receive beam in the receive beam set. The operations of 1130 may be performed according to the methods described herein. In some examples, aspects of the operations of 1130 may be described with reference to Figures 6 to 9 Describes the resource manager to execute.

[0185] Fig.12 A flow chart illustrating a method 1200 for supporting a discontinuous reception mechanism for sidelink communications according to aspects of the present disclosure is shown. The operations of the method 1200 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1200 may be implemented by reference to Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described herein.

[0186] At 1205, the UE may send a discontinuous transmission configuration for a sidelink connection between the first UE and the second UE to the first UE. The operations of 1205 may be performed according to the methods described herein. In some examples, aspects of the operations of 1205 may be described with reference to Figures 6 to 9 Describes the connection manager to perform.

[0187] At 1210, the UE may receive a discontinuous reception configuration for a sidelink connection from a first UE, the discontinuous reception configuration indicating a set of receive beams for discontinuous reception of the sidelink connection by the first UE based on the transmitted discontinuous transmission configuration. The operations of 1210 may be performed according to the methods described herein. In some examples, aspects of the operations of 1210 may be described with reference to Figures 6 to 9 The beam manager described is used to perform the

[0188] At 1215, the UE may send signaling to the first UE using the side link connection according to the transmitted discontinuous transmission configuration and based on the received discontinuous reception configuration. The operations of 1215 may be performed according to the methods described herein. In some examples, aspects of the operations of 1215 may be described with reference to Figures 6 to 9 The signaling manager described here is used to perform the above operations.

[0189] Fig.13 A flow chart illustrating a method 1300 for supporting a discontinuous reception mechanism for sidelink communications according to aspects of the present disclosure is shown. The operations of the method 1300 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1300 may be implemented by reference to Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described herein.

[0190] At 1305, the UE may send a discontinuous transmission configuration for a sidelink connection between the first UE and the second UE to the first UE. The operations of 1305 may be performed according to the methods described herein. In some examples, aspects of the operations of 1305 may be described with reference to Figures 6 to 9 Describes the connection manager to perform.

[0191] At 1310, the UE may receive a discontinuous reception configuration for a sidelink connection from a first UE, the discontinuous reception configuration indicating a set of receive beams used by the first UE for discontinuous reception of the sidelink connection based on the transmitted discontinuous transmission configuration. The operations of 1310 may be performed according to the methods described herein. In some examples, aspects of the operations of 1310 may be described with reference to Figures 6 to 9 The beam manager described is used to perform the

[0192] At 1315, the UE may send signaling to the first UE using the side link connection according to the transmitted discontinuous transmission configuration and based on the received discontinuous reception configuration. The operations of 1315 may be performed according to the methods described herein. In some examples, aspects of the operations of 1315 may be described with reference to Figures 6 to 9 The signaling manager described here is used to perform the above operations.

[0193] At 1320, the UE may identify a transmit beam of the second UE corresponding to the receive beam of the first UE indicated in the discontinuous reception configuration, and the signaling is sent on the identified transmit beam. The operation of 1320 may be performed according to the method described herein. In some examples, aspects of the operation of 1320 may be described with reference to Figures 6 to 9 The beam manager described is used to perform the

[0194] At 1325, the UE may determine, based on the discontinuous reception configuration, time resources or frequency resources or both corresponding to one or more receive beams in the receive beam set. The operation of 1325 may be performed according to the method described herein. In some examples, aspects of the operation of 1325 may be described with reference to Figures 6 to 9 Described in the schema manager to execute.

[0195] At 1330, the UE may receive the discontinuous reception configuration during the discontinuous transmission occasion indicated in the transmitted discontinuous transmission configuration. The operations of 1330 may be performed according to the methods described herein. In some examples, aspects of the operations of 1330 may be described with reference to Figures 6 to 9 Described in the schema manager to execute.

[0196] The following provides an overview of aspects of the present disclosure:

[0197] Aspect 1: A method for wireless communication at a first UE, comprising: receiving a discontinuous transmission configuration for a side link connection between the first UE and the second UE from a second UE; determining a receive beam set for discontinuous reception of the side link connection by the first UE based at least in part on the received discontinuous transmission configuration; and sending a discontinuous reception configuration to the second UE, the discontinuous reception configuration indicating the determined receive beam set for discontinuous reception of the side link connection.

[0198] Aspect 2: The method according to Aspect 1, wherein sending a discontinuous reception configuration further comprises: sending an indication of at least one beam in a receive beam set.

[0199] Aspect 3: The method according to any one of Aspects 1 to 2, wherein sending a discontinuous reception configuration further comprises: sending an indication of time resources or frequency resources or both corresponding to one or more receiving beams in a receiving beam set.

[0200] Aspect 4: A method according to Aspect 3, wherein sending an indication of time resources or frequency resources or both includes: for a cyclic set of discontinuous reception, sending an indication of time resources, during which the first UE will use each corresponding receiving beam in the receiving beam set for reception.

[0201] Aspect 5: According to the method described in any one of Aspects 1 to 4, the method also includes: attempting to receive transmissions from a second UE on a determined receive beam set and on a corresponding timing set during a cycle of discontinuous reception; and receiving transmissions from the second UE on a receive beam of the receive beam set and during a timing in a timing set corresponding to the receive beam.

[0202] Aspect 6: The method according to any one of aspects 1 to 5, wherein the discontinuous reception configuration is sent to the second UE during the discontinuous transmission opportunity indicated in the received discontinuous transmission configuration.

[0203] Aspect 7: The method according to any one of aspects 1 to 6, wherein the discontinuous reception configuration is sent to the second UE during the discontinuous reception ON time duration of the second UE.

[0204] Aspect 8: The method according to any one of Aspects 1 to 7 further includes: sending multiple discontinuous reception configurations including the discontinuous reception configuration to the second UE, wherein each of the multiple discontinuous reception configurations includes a receiving beam configuration, and the first UE will use the receiving beam configuration during a single discontinuous reception ON duration of the second UE.

[0205] Aspect 9: The method according to any one of Aspects 1 to 8 further includes: allocating a first index corresponding to a receiving beam configuration of a discontinuous reception configuration to a second UE, wherein the discontinuous reception configuration includes a receiving beam configuration and a first allocation index.

[0206] Aspect 10: The method according to Aspect 9 further includes: identifying multiple receive beams that the first UE is configured to form; and determining to use a first receive beam and a second receive beam among the multiple receive beams to receive a transmission from a second UE, wherein the receive beam configuration indicates the first receive beam and the second receive beam.

[0207] Aspect 11: The method according to aspect 10 further includes: identifying that the first receive beam is superior to the second receive beam, wherein the first allocation index corresponds to the first receive beam based at least in part on the superiority of the first receive beam over the second receive beam.

[0208] Aspect 12: The method according to any one of aspects 9 to 11, wherein the first allocation index is indicated for the entire discontinuous reception ON duration.

[0209] Aspect 13: A method according to any one of Aspects 9 to 12, wherein the first allocation index is indicated for a first duration of the discontinuous reception ON duration, and the second index is indicated for a second duration of the discontinuous reception ON duration, and the second index points to a second receive beam configuration of the discontinuous reception configuration.

[0210] Aspect 14: The method according to any one of Aspects 9 to 13 further includes: allocating a second index corresponding to a second receiving beam configuration of a discontinuous reception configuration to a second UE, wherein the discontinuous reception configuration includes a receiving beam configuration, a first allocation index, and a second allocation index, and wherein the second UE can use the first allocation index or the second allocation index to reestablish a connection with the first UE.

[0211] Aspect 15: The method according to aspect 14 further includes: indicating to the second UE that the second allocation index includes a degradation in quality of service relative to the first allocation index.

[0212] Aspect 16: A method according to any one of Aspects 1 to 15, wherein the discontinuous reception configuration includes an indication of a discontinuous reception period, or a frame offset, or a time slot offset, or a discontinuous reception ON duration, or an index of a receive beam configuration of the discontinuous reception configuration selected by the first UE for use during the discontinuous reception ON duration, or a combination thereof.

[0213] Aspect 17: The method according to any one of Aspects 1 to 16 further includes: receiving a first radio resource control connection reconfiguration message from a second UE via a side link connection, wherein the first radio resource control connection reconfiguration message includes a discontinuous transmission configuration.

[0214] Aspect 18: The method according to aspect 17 further includes: sending a second radio resource control connection reconfiguration message to the second UE based at least in part on the first radio resource control connection reconfiguration message from the second UE.

[0215] Aspect 19: The method according to any one of aspects 17 to 18 further comprises: sending a request to the second UE to apply an offset to the discontinuous transmission configuration based at least in part on the first radio resource control connection reconfiguration message from the second UE.

[0216] Aspect 20: A method for wireless communication at a second UE, comprising: sending a discontinuous transmission configuration for a side link connection between the first UE and the second UE to a first UE; receiving a discontinuous reception configuration for the side link connection from the first UE, the discontinuous reception configuration indicating a set of receive beams for discontinuous reception used by the first UE for the side link connection based at least in part on the sent discontinuous transmission configuration; and sending signaling to the first UE using the side link connection based on the sent discontinuous transmission configuration and at least in part on the received discontinuous reception configuration.

[0217] Aspect 21: According to the method of Aspect 20, the method further includes: identifying a transmit beam of the second UE corresponding to the receive beam of the first UE indicated in the discontinuous reception configuration, and signaling is sent on the identified transmit beam.

[0218] Aspect 22: According to the method of any one of Aspects 20 to 21, the method further includes: determining, according to the discontinuous reception configuration, time resources or frequency resources or both corresponding to one or more receive beams in the receive beam set.

[0219] Aspect 23: The method according to any one of aspects 20 to 22, wherein the discontinuous reception configuration is received during a discontinuous transmission opportunity indicated in the transmitted discontinuous transmission configuration.

[0220] Aspect 24: The method according to any one of aspects 20 to 23, wherein the discontinuous reception configuration is received during a discontinuous reception ON time duration of the second UE.

[0221] Aspect 25: The method according to any one of Aspects 20 to 24 further includes: receiving multiple discontinuous reception configurations from the first UE, including a discontinuous reception configuration, wherein each of the multiple discontinuous reception configurations includes a receiving beam configuration, and the first UE will use the receiving beam configuration during a single discontinuous reception ON duration of the second UE.

[0222] Aspect 26: According to the method according to Aspect 25, the method also includes: receiving a first index corresponding to a reception beam configuration of a discontinuous reception configuration from the first UE, wherein the discontinuous reception configuration includes the reception beam configuration and the first allocation index.

[0223] Aspect 27: The method according to Aspect 26 further includes: receiving, from the first UE, a second index corresponding to a second reception beam configuration of the discontinuous reception configuration.

[0224] Aspect 28: The method according to Aspect 27 further includes: using the first reception index or the second reception index to reestablish a connection with the first UE.

[0225] Aspect 29: The method according to any one of Aspects 27 to 28 further includes: determining that the second reception index includes a decrease in service quality relative to the first reception index; and when using the second reception index to send a signal to the first UE, increasing the transmission power or downgrading the modulation and coding scheme.

[0226] Aspect 30: The method according to any one of Aspects 20 to 29 further includes: sending a first instance of a message in a first beam direction indicated in a discontinuous reception configuration; sending a second instance of a message in a second beam direction indicated in the discontinuous reception configuration based at least in part on receiving negative feedback or not receiving feedback for the first instance; receiving positive feedback for the message; and bypassing a third instance of sending a message in a third beam direction based at least in part on receiving positive feedback.

[0227] Aspect 31: The method according to any one of Aspects 20 to 30 further includes: using a side link connection to send a first radio resource control connection reconfiguration message to the first UE, wherein the first radio resource control connection reconfiguration message includes a discontinuous transmission configuration.

[0228] Aspect 32: The method according to aspect 31 further comprises: receiving a second radio resource control connection reconfiguration message from the first UE based at least in part on sending the first radio resource control connection reconfiguration message to the first UE.

[0229] Aspect 33: According to the method of any one of Aspects 31 to 32, the method further includes: receiving a request for applying an offset to the discontinuous transmission configuration from the first UE based at least in part on sending a first radio resource control connection reconfiguration message to the first UE.

[0230] Aspect 34: The method according to any one of Aspects 20 to 33 further includes: sending a data packet to a first UE using a side link connection; receiving confirmation feedback indicating a negative confirmation or no confirmation from the first UE; retransmitting the data packet to the first UE using the side link connection based at least in part on the received confirmation feedback; and receiving a radio resource control connection reconfiguration message from the first UE at least in part in response to the retransmission of the data packet.

[0231] Aspect 35: The method according to any one of Aspects 20 to 34 further includes: sending a first radio resource control connection reconfiguration message and at least a portion of a data packet to a first UE using a side link connection; and receiving a second radio resource control connection reconfiguration message from the first UE based at least in part on the first radio resource control connection reconfiguration message or at least a portion of the data packet.

[0232] Aspect 36: An apparatus for wireless communication at a first UE, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of any one of Aspects 1 to 19.

[0233] Aspect 37: An apparatus for wireless communication at a first UE, comprising at least one component for performing the method of any one of Aspects 1 to 19.

[0234] Aspect 38: A non-transitory computer-readable medium storing a code for wireless communication at a first UE, the code comprising instructions executable by a processor to perform the method of any one of aspects 1 to 19.

[0235] Aspect 39: An apparatus for wireless communication at a second UE, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of any one of Aspects 20 to 35.

[0236] Aspect 40: An apparatus for wireless communication at a second UE, comprising at least one component for performing the method of any one of Aspects 20 to 35.

[0237] Aspect 41: A non-transitory computer-readable medium storing a code for wireless communication at a second UE, the code comprising instructions executable by a processor to perform the method of any one of Aspects 20 to 35.

[0238] It should be noted that the methods described herein describe possible implementations, and that operations and steps may be rearranged or modified, and other implementations are possible. In addition, aspects of two or more methods may be combined.

[0239] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques 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.

[0240] The information and signals described herein may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips cited throughout the specification may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0241] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or executed with a general purpose processor, a DSP, an ASIC, a CPU, 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 herein. A general purpose processor may be a microprocessor, but alternatively, 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).

[0242] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored or transmitted as one or more instructions or codes on a computer-readable medium. Other examples and implementations are within the scope of this 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, hardwiring, or any combination of these. Features that implement the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented in different physical locations.

[0243] Computer-readable media include both non-transitory computer storage media and communication media, and communication media include any media that is convenient for transferring a computer program from one place to another.Non-transitory storage media can be any available media that can be accessed by a general or special computer.As an example and not limitation, non-transitory computer-readable media can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, disk storage or other magnetic storage devices, or can be used to carry or store desired program code components in the form of instructions or data structures and can be accessed by a general or special computer or a general or special processor.Again, any connection is properly referred to as a computer-readable medium.For example, if software is sent from a website, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technologies such as infrared, radio and microwaves, coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwaves are included in the definition of computer-readable media. Disk and disc, as used herein, includes CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0244] As used herein, including in the claims, "or" used in a list of items (e.g., a list of items beginning with a phrase such as "at least one" or "one or more") means 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 referring to a closed set of conditions. For example, an example step described as "based on condition A" can be based on condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0245] In the drawings, similar components or features may have the same reference number. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second reference number that distinguishes the similar components. If only the first reference number is used in the specification, the description applies to any one of the similar components having the same first reference number, regardless of the second reference number or other subsequent reference numbers.

[0246] The description set forth herein, in conjunction with the accompanying drawings, describes example configurations and does not represent all examples that may 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 "superior to other examples." The detailed description includes specific details for the purpose of providing an understanding of the described techniques. However, these techniques may be implemented without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0247] The description provided herein is to enable one of ordinary skill in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present 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. A method for wireless communication at a first user equipment (UE), comprising: receiving, from the second UE, a discontinuous transmission configuration for a sidelink connection between the first UE and the second UE; determining, based at least in part on the received discontinuous transmission configuration, a set of receive beams to be used by the first UE for discontinuous reception of a sidelink connection; as well as A discontinuous reception configuration is sent to the second UE, where the discontinuous reception configuration indicates a determined set of receive beams for discontinuous reception of the sidelink connection.

2. The method according to claim 1, wherein: The transmit discontinuous reception configuration also includes: An indication of at least one beam in a set of receive beams is sent.

3. The method according to claim 1, wherein: The transmit discontinuous reception configuration also includes: An indication of time resources or frequency resources or both corresponding to one or more receive beams in the receive beam set is sent.

4. The method according to claim 3, wherein: The indication of sending time resources or frequency resources or both includes: For a cyclic set of discontinuous reception, an indication of time resources during which the first UE is to receive using each corresponding receive beam in the set of receive beams is sent.

5. The method according to claim 1, further comprising: Attempting to receive a transmission from a second UE on the determined set of receive beams and on a corresponding set of opportunities during a cycle of discontinuous reception; as well as A transmission from a second UE is received on a receive beam in the set of receive beams during one of the timings in the set of timings corresponding to the receive beam.

6. The method according to claim 1, wherein: The discontinuous reception configuration is sent to the second UE during the discontinuous transmission opportunity indicated in the received discontinuous transmission configuration.

7. The method according to claim 1, wherein: The discontinuous reception configuration is sent to the second UE during the discontinuous reception ON duration of the second UE.

8. The method according to claim 1, further comprising: A plurality of discontinuous reception configurations including the discontinuous reception configuration are transmitted to the second UE, wherein each of the plurality of discontinuous reception configurations includes a reception beam configuration to be used by the first UE within a single discontinuous reception ON duration of the second UE.

9. The method according to claim 1, further comprising: A first index corresponding to a reception beam configuration of a discontinuous reception configuration is allocated to a second UE, wherein the discontinuous reception configuration includes the reception beam configuration and the first allocation index.

10. The method according to claim 9, further comprising: identifying a plurality of receive beams that the first UE is configured to form; as well as A determination is made to receive a transmission from a second UE using a first receive beam and a second receive beam of the plurality of receive beams, wherein the receive beam configuration indicates the first receive beam and the second receive beam.

11. The method according to claim 9, wherein: The first allocation index is indicated for the entire discontinuous reception ON duration.

12. The method according to claim 9, wherein: The first allocation index is indicated for a first duration of the discontinuous reception ON duration, and the second index is indicated for a second duration of the discontinuous reception ON duration, the second index pointing to a second reception beam configuration of the discontinuous reception configuration.

13. The method according to claim 9, further comprising: allocating a second index corresponding to a second receive beam configuration of a discontinuous reception configuration to a second UE, wherein the discontinuous reception configuration includes the receive beam configuration, the first allocation index, and the second allocation index, and wherein the second UE may use the first allocation index or the second allocation index to reestablish a connection with the first UE; and Indicating to the second UE that the second allocation index comprises a reduction in quality of service relative to the first allocation index.

14. The method according to claim 1, wherein: The discontinuous reception configuration includes an indication of: a discontinuous reception period, or a frame offset, or a time slot offset, or a discontinuous reception ON duration, or an index of a receive beam configuration of the discontinuous reception configuration selected by the first UE for use during the discontinuous reception ON duration, or a combination thereof.

15. The method according to claim 1, further comprising: receiving a first radio resource control connection reconfiguration message from the second UE through the sidelink connection, wherein the first radio resource control connection reconfiguration message includes a discontinuous transmission configuration; and Based at least in part on the first radio resource control connection reconfiguration message from the second UE, a second radio resource control connection reconfiguration message is sent to the second UE, the second radio resource control connection reconfiguration message including a request to apply an offset to the discontinuous transmission configuration.

16. A method for wireless communication at a second user equipment (UE), comprising: sending, to the first UE, a discontinuous transmission configuration for a sidelink connection between the first UE and a second UE; receiving, from the first UE, a discontinuous reception configuration for the sidelink connection, the discontinuous reception configuration indicating a set of receive beams used by the first UE for discontinuous reception of the sidelink connection based at least in part on the transmitted discontinuous transmission configuration; as well as Signaling is sent to the first UE using the sidelink connection according to the transmitted discontinuous transmission configuration and based at least in part on the received discontinuous reception configuration.

17. The method according to claim 16, further comprising: identifying a transmit beam of the second UE corresponding to a receive beam of the first UE indicated in the discontinuous reception configuration, signaling being transmitted on the identified transmit beam; as well as According to the discontinuous reception configuration, time resources or frequency resources or both corresponding to one or more receive beams in the receive beam set are determined.

18. The method according to claim 16, wherein: The discontinuous reception configuration is received during the discontinuous transmission opportunity indicated in the transmitted discontinuous transmission configuration.

19. The method according to claim 16, wherein: The discontinuous reception configuration is received during the discontinuous reception ON duration of the second UE.

20. The method of claim 16, further comprising: A plurality of discontinuous reception configurations including the discontinuous reception configuration is received from the first UE, wherein each of the plurality of discontinuous reception configurations includes a receive beam configuration to be used by the first UE during a single discontinuous reception ON-duration of the second UE.

21. The method of claim 16, further comprising: Sending a first radio resource control connection reconfiguration message to the first UE using the sidelink connection, wherein the first radio resource control connection reconfiguration message includes a discontinuous transmission configuration; and Based at least in part on sending the first radio resource control connection reconfiguration message to the first UE, a second radio resource control connection reconfiguration message is received from the first UE, the second radio resource control connection reconfiguration message including a request to apply an offset to the discontinuous transmission configuration.

22. The method of claim 16, further comprising: sending a first data packet to the first UE using the sidelink connection; receiving an acknowledgement feedback indicating a negative acknowledgement or no acknowledgement from the first UE; retransmitting the first data packet to the first UE using the sidelink connection based at least in part on the received acknowledgment feedback; receiving a radio resource control connection reconfiguration message from the first UE in response at least in part to the retransmission of the first data packet; sending a third radio resource control connection reconfiguration message and at least a portion of the second data packet to the first UE using the sidelink connection; as well as Based at least in part on the third radio resource control connection reconfiguration message or at least a portion of the second data packet, a fourth radio resource control connection reconfiguration message is received from the first UE.

23. An apparatus for wireless communication at a first user equipment (UE), comprising: processor, a memory coupled to the processor; as well as Instructions, stored in the memory and executable by the processor, to cause the device to: receiving, from the second UE, a discontinuous transmission configuration for a sidelink connection between the first UE and the second UE; determining, based at least in part on the received discontinuous transmission configuration, a set of receive beams to be used by the first UE for discontinuous reception of a sidelink connection; and A discontinuous reception configuration is sent to the second UE, where the discontinuous reception configuration indicates a determined set of receive beams for discontinuous reception of the sidelink connection.

24. The device according to claim 23, wherein: The instructions for sending the discontinuous reception configuration may also be executed by the processor to cause the apparatus to: An indication of at least one beam in a set of receive beams is sent.

25. The device according to claim 23, wherein: The instructions for sending the discontinuous reception configuration may also be executed by the processor to cause the apparatus to: An indication of time resources or frequency resources or both corresponding to one or more receive beams in the set of receive beams is sent.

26. The device according to claim 23, wherein The instructions are further executable by the processor to cause the device to: Attempting to receive a transmission from a second UE on the determined set of receive beams and on a corresponding set of opportunities during a cycle of discontinuous reception; as well as A transmission from a second UE is received on a receive beam in the set of receive beams during one of the timings in the set of timings corresponding to the receive beam.

27. The device according to claim 23, wherein: The discontinuous reception configuration is sent to the second UE during the discontinuous transmission opportunity indicated in the received discontinuous transmission configuration or during the discontinuous reception ON duration of the second UE.

28. The device according to claim 23, wherein: The instructions are further executable by the processor to cause the device to: A plurality of discontinuous reception configurations including the discontinuous reception configuration are transmitted to the second UE, wherein each of the plurality of discontinuous reception configurations includes a receive beam configuration to be used by the first UE during a single discontinuous reception ON-duration of the second UE.

29. The device according to claim 23, wherein: The instructions are further executable by the processor to cause the device to: A first index corresponding to a reception beam configuration in a discontinuous reception configuration is allocated to a second UE, wherein the discontinuous reception configuration includes the reception beam configuration and the first allocation index.

30. An apparatus for wireless communication at a second user equipment (UE), comprising: processor, a memory coupled to the processor; as well as Instructions, stored in the memory and executable by the processor, to cause the device to: sending, to the first UE, a discontinuous transmission configuration for a sidelink connection between the first UE and a second UE; receiving a discontinuous reception configuration for the sidelink connection from the first UE, the discontinuous reception configuration indicating a set of receive beams used by the first UE for discontinuous reception of the sidelink connection based at least in part on the transmitted discontinuous transmission configuration; and Signaling is sent to the first UE using the sidelink connection according to the transmitted discontinuous transmission configuration and based at least in part on the received discontinuous reception configuration.

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