Qualcomm Incorporated

Kaidong Wang

Jelena Damnjanovic

Tao Luo

Junyi Li

Sony Akkarakaran

Ozcan Ozturk

Juan Montojo

Aleksandar Damnjanovic

Jing X Sun

Qing Li

Peter S Gaal

Wooseok Nam

Mahmoud Taherzadeh Boroujeni

Methods, systems, and devices for wireless communications are described. Wireless devices may be configured to support techniques for bi-directional discontinuous reception (DRX) alignment and centralized DRX alignment. In the context of bi-directional DRX alignment, DRX configurations at two respective user equipments (UEs) are first established in a first direction, and then DRX configurations are then established in the reverse direction based on the previously-established DRX configurations. In particular, DRX configurations in the reverse direction may be selected such that the Uu and sidelink DRX configurations are aligned at the respective UEs and across the UEs. Comparatively, in the context of centralized DRX alignment, a master base station receives 'candidate' Uu and sidelink DRX configurations for multiple UEs, and selects Uu and sidelink DRX configurations for each UE from the sets of candidate DRX configurations in order to ensure DRX alignment across the respective UEs.

Discontinuous reception alignment for wireless communications

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may transmit, to a second UE associated with a sidelink connection with the first UE, assistance information indicating at least part of a first discontinuous reception (DRX) configuration for a radio access link between the first UE and a base station. The UE may receive at least part of a sidelink DRX configuration for the sidelink connection, wherein an on duration of the sidelink DRX configuration is not aligned with an on duration of the first DRX configuration. The UE may transmit information indicating at least part of the sidelink DRX configuration. The UE may receive, from the base station, a second DRX configuration for the radio access link. The UE may communicate in accordance with the sidelink DRX configuration or the second DRX configuration. Numerous other aspects are described.

Techniques for radio access and sidelink discontinuous reception alignment

Aspects relate to aligning discontinuous reception (DRX) timing associated with sidelink communication. In some examples, a DRX alignment group may be indicated for a user equipment (UE) for the purposes of aligning the DRX timing of a sidelink connection with the DRX timing of at least one other connection (e.g., a base station connection and/or another sidelink connection). In some examples, a base station may signal to the UE an indication of at least one DRX alignment group for the UE.

Discontinuous reception alignment grouping for sidelink and cellular communication

Aspects present herein relate to methods and devices for wireless communication including an apparatus, e.g., a UE and/or a base station. More specifically, aspects described are directed to enhancements to bi-directional alignment of discontinuous reception (DRX). In some examples, an apparatus may receive, from a first user equipment (UE), an indication of discontinuous reception (DRX) assistance information. The apparatus may further configure a first sidelink (SL) DRX configuration for the first UE, a second SL DRX configuration for a second UE, and a first UE-universal mobile telecommunications system terrestrial radio access (UTRA) interface (Uu) DRX configuration for the first UE, wherein at least one of the first SL DRX configuration, the second SL DRX configuration, and the first Uu DRX configuration are configured based on the DRX assistance information.

Signaling of joint alignment of UU DRX and SL DRX

Certain aspects of the present disclosure provide techniques for air interface and sidelink discontinuous reception alignment for inactive/idle user equipment. A method performed by a user equipment (UE) includes receiving, from a second user equipment at a first user equipment over a sidelink interface, discontinuous reception (DRX) configuration assistance information and transmitting, from the first user equipment to a network via an air interface, the DRX configuration assistance information. The method may further include receiving, from the network at the first user equipment via the air interface: modified air interface DRX configuration information for the first user equipment, and sidelink DRX configuration information for the first user equipment and the second user equipment, wherein the sidelink DRX configuration information is based on the DRX configuration assistance information; and transmitting, from the first user equipment to the second user equipment over the sidelink interface, the sidelink DRX configuration information.

Procedure and signaling for sidelink DRX alignment

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first network node (e.g., a first user equipment (UE)) may determine a first sidelink discontinuous reception (DRX) priority assigned to the first network node, wherein the sidelink DRX priority is based on one or more criteria associated with the first network node. The first network node may communicate on a sidelink channel using a first set of one or more DRX configurations based on the first sidelink DRX priority assigned to the first network node, wherein the first set of one or more DRX configurations are at least partially aligned in time with a second set of one or more DRX configurations of a second network node (e.g., a second UE) assigned a second sidelink DRX priority that is equivalent to the first sidelink DRX priority. Numerous other aspects are described.

Discontinuous reception alignment with respect to prioritization

Certain aspects of the present disclosure provide techniques for sidelink synchronization in a network. A method that may be performed by a remote user equipment (UE) includes determining at least one synchronization priority associated with synchronization signals for synchronizing to a network, determining relay capability information associated with multiple relay UEs, selecting one relay UE of the multiple relay UEs, based on the synchronization priority and relay capability, and synchronizing to the network using at least one synchronization signal received from the selected one relay UE.

Sidelink synchronization techniques

Aspects presented herein may enable a base station to page a target UE in an idle mode via a relay UE. In one aspect, a first UE receives, from a base station, a paging relay request message including paging information for at least a second UE, each paging information including a UE identity for the second UE and a paging type. The first UE transmits a paging message from the first UE to the second UE over sidelink. In another aspect, a base station generates a paging relay request message including paging information for at least a second UE, the paging information indicating a UE ID for the second UE and a paging type. The base station transmits, to a first UE, the paging relay request message, the paging relay request message indicating a request for the first UE to relay paging information to the second UE over sidelink.

Paging over sidelink

A network access node including a transceiver coupled to a sidelink receiver user equipment (UE) (or to a sidelink transmitter UE) is disclosed. The network access node may obtain a network access interface discontinuous reception (DRX) slot offset value (or a sidelink interface DRX slot offset value) corresponding to a shift in a network access interface DRX Active state start time (or a sidelink interface DRX Active state start time) of the receiver UE. The shift may configure an alignment of a sidelink interface DRX Active state start time (or the network access interface DRX Active state start time) with the network access interface DRX Active state start time (or the sidelink interface DRX Active state start time). The network access interface DRX (or sidelink interface DRX) slot offset value may be transmitted to the receiver UE.

Combined network access interface and sidelink interface discontinuous reception (DRX) alignment

Certain aspects of the present disclosure provide techniques for air interface and sidelink discontinuous reception alignment for inactive/idle user equipment. A method performed by a user equipment (UE) includes receiving, from a network at a first user equipment over an air interface, discontinuous reception (DRX) configuration assistance information, and transmitting, from the first user equipment to a second user equipment via a sidelink interface, the DRX configuration assistance information. The method may further include receiving, from the second user equipment at the first user equipment via the sidelink interface, sidelink DRX configuration information, wherein the sidelink DRX configuration information is based on the DRX configuration assistance information, and transmitting, from the first user equipment to the network over the air interface, the sidelink DRX configuration information. The method may include receiving, from the network at the first user equipment, modified air interface DRX configuration information for the first user equipment.

Aspects present herein relate to methods and devices for wireless communication including an apparatus, e.g., a UE and/or a base station. The apparatus may receive a first indication of assistance information associated with a Uu DRX configuration and an SL DRX configuration. The apparatus may also transmit a second indication of the assistance information associated with the Uu DRX configuration and the SL DRX configuration. Additionally, the apparatus may receive an indication of the Uu DRX configuration and an indication of the SL DRX configuration.

Signaling of joint alignment of Uu DRX and SL DRX

An apparatus includes one or more transmitters configured to transmit, from a first user equipment (UE) to a second UE, a sidelink discontinuous reception (DRX) setup request indicating a first DRX configuration of the first UE. The apparatus further includes one or more receivers configured to receive, from the second UE, a sidelink DRX setup response based on the sidelink DRX setup request and indicating a second DRX configuration. The one or more transmitters are further configured to transmit, to a first base station, an uplink message indicating the second DRX configuration, and the one or more receivers are further configured to receive, from the first base station, a downlink message indicating one or more adjusted parameters of the first DRX configuration that are based at least in part on the second DRX configuration.

Discontinuous reception (DRX) configuration for a user equipment (UE)

Methods, systems, and devices for wireless communication are described related to timer-based sidelink discontinuous reception (DRX). A UE may receive configuration information for a sidelink DRX mode from a base station or another UE, which may indicate one or more parameters of the sidelink DRX mode. When operating in the sidelink DRX mode, a group of UEs may have shared active durations and inactive durations for coordinating sidelink communications. In a timer-based sidelink DRX mode, if a UE receives or transmits a sidelink communication, the UE may initiate an inactivity timer, and the UE may continue to monitor a sidelink channel for other sidelink communications while the timer is running. One or more rules may govern the operation of an inactivity timer with respect to the shared inactive durations.

Timer-based discontinuous reception for sidelink communications

Methods, systems, and devices for wireless communication are described. A communication device, such as a user equipment (UE) may receive control signaling indicating a sidelink beam reporting resource configuration. The UE may receive a set of reference beams from a second device (e.g., another UE) over a sidelink. In some examples, the UE may perform a set of beam measurements based on a beam measurement occasion during at least one of a time period before an active duration. The UE may transmit a beam measurement report to the second device in accordance with the sidelink beam reporting resource configuration. The beam measurement report being transmitted during at least one of a time period before the active duration, a time period during the active duration, or a combination thereof. The beam measurement report may be based on the set of beam measurements associated with the set of reference beams.

Techniques for beam measurement reporting

Methods, systems, and devices for wireless communications are described. A communication device may receive control signaling indicating a sidelink beam failure reporting configuration including a set of sidelink beam failure reporting events. The communication device may identify occurrence of a sidelink beam failure reporting event, and may transmit a beam measurement report to another communication device over a sidelink in accordance with the sidelink beam failure reporting configuration. The transmission of the beam measurement report may be triggered based on the sidelink beam failure reporting event.

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San Diego, CA, United States of America

Kaidong Wang