Discontinuous reception (DRX) using sidelink (SL)

Abstract

Systems and methods are disclosed for configuring and providing discontinuous reception (DRX) operation in sidelink (SL) mode 1 and mode 2. A first user equipment (UE) can operate in DRX communication with a second UE over a SL while maintaining DRX communication with a base station. In some embodiments, the DRX operation can include the first UE monitoring one or both of transmissions in a downlink from the base station and transmissions in the SL from the second UE during an active period of a DRX cycle of the DRX configuration. In embodiments, the UE can extend the active period associated with the DRX cycle when receiving control information from the base station or the second UE. Other aspects and features are also claimed and described.

Description

[0001] Cross Reference to Related Applications

[0002] This application claims the benefit of U.S. Patent Application No. 17 / 448,665 (208632) entitled “DISCONTINUOUS RECEPTION (DRX) WITH SIDELINK (SL)” filed September 23, 2021, and U.S. Provisional Patent Application No. 63 / 083,053 (208632P1) entitled “DISCONTINUOUS RECEPTION (DRX) WITH SIDELINK (SL) IN MODE 1” filed September 24, 2020, and U.S. Provisional Patent Application No. 63 / 083,056 (208633P1) entitled “DISCONTINUOUS RECEPTION (DRX) WITH SIDELINK (SL) IN MODE 2” filed September 24, 2020, the disclosures of which are hereby incorporated by reference herein in their entireties, as if set forth below in their entirety and for all applicable purposes. TECHNICAL FIELD

[0003] Aspects of the present disclosure relate generally to wireless communication systems, and more particularly, to discontinuous reception (DRX) communications. Certain embodiments of the technology discussed below can enable and provide sidelink (SL) DRX communications in SL Mode 1 and / or Mode 2. BACKGROUND

[0004] Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcast, and the like. These wireless networks can be multiple-access networks capable of supporting multiple users by sharing the available network resources. Such networks, which are usually multiple access networks, support communications for multiple users by sharing the available network resources.

[0005] A wireless communication network can include a number of base stations or node Bs that can support communication for a number of user equipments (UEs). A UE can communicate with a base station via the downlink and uplink. The downlink (or forward link) refers to the communication from the base station to the UE, and the uplink (or reverse link) refers to the communication from the UE to the base station.

[0006] A base station can transmit data and control information on the downlink to a UE and / or can receive data and control information on the uplink from the UE. On the downlink, transmissions from the base station can encounter interference from transmissions by

[0007] As the demand for mobile broadband access continues to increase, the possibilities of interference and congested networks grows with more UEs accessing the long-range wireless communication networks and more short-range wireless systems being deployed in communities. Research and development continue to advance wireless technologies not only to meet the growing demand for mobile broadband access, but to advance and enhance the user experience with mobile communications. SUMMARY

[0008] The following presents a simplified summary of some aspects of the present disclosure in order to provide a basic understanding of the discussed technologies. This summary is not an extensive overview of all contemplated features of the present disclosure, and is intended neither to identify key or critical elements of all aspects of the present disclosure nor to delineate the scope of any or all aspects of the present disclosure. Its sole purpose is to present some concepts of one or more aspects of the present disclosure in a summary form as a prelude to the more detailed description that is presented later.

[0009] In one aspect of the disclosure, a method of wireless communication includes receiving, by a first UE in communication with a second UE on a SL, SL control information (SCI) from the second UE in a physical SL control channel (PSCCH). In aspects, the first UE operates in a DRX mode and the PSCCH is received by the first UE during an active time period of a DRX cycle of the first UE. The method further includes, in response to receiving the SL control information from the second UE in the PSCCH, extending the active time period of the DRX cycle in which the SL control information is received from the second UE in the PSCCH when the PSCCH indicates a subsequent data transmission from the second UE to the first UE on the SL.

[0010] In an additional aspect of the disclosure, a method of wireless communication includes receiving, by a first UE in communication with a second UE on a SL, a transmission grant from a base station serving the first UE and the second UE, and transmitting, by the first UE, SCI in a PSCCH to the second UE. In embodiments, the second UE operates in a DRX mode, and the SCI in the PSCCH is received by the second UE during an active time period of a DRX cycle of the second UE. In embodiments, the SCI includes a configuration for a subsequent data transmission from the first UE to the second UE on the SL. In embodiments, transmitting the SCI in the PSCCH to the second UE causes the second UE to extend an active time period of a DRX cycle of the second UE in which the SCI in the PSCCH is received when the PSCCH indicates a subsequent data transmission from the first UE to the second UE on the SL.

[0011] In an additional aspect of the disclosure, a method of wireless communication includes transmitting, by a base station serving a first UE and a second UE, a transmission grant to the first UE, the first UE being in communication with the second UE on a SL. In embodiments, the second UE operates in a DRX mode, and the transmission grant causes the first UE to transmit SCI in a PSCCH to the second UE, the SCI including a configuration for a subsequent data transmission from the first UE to the second UE on the SL. In embodiments, the SCI in the PSCCH is received by the second UE during an active time period of a DRX cycle of the second UE, and receiving the SCI in the PSCCH from the first UE causes the second UE to extend an active time period of a DRX cycle of the second UE in which the SCI in the PSCCH is received when the PSCCH indicates a subsequent data transmission from the first UE to the second UE on the SL.

[0012] In an additional aspect of the disclosure, an apparatus configured for wireless communication includes means for receiving, by a first UE in communication with a second UE on a SL, SCI in a PSCCH from the second UE. In aspects, the first UE operates in a DRX mode, and the PSCCH is received by the first UE during an active time period of a DRX cycle of the first UE. The apparatus further includes means for extending, in response to receiving the SL control information in the PSCCH from the second UE, an active time period of a DRX cycle in which the SL control information in the PSCCH is received from the second UE when the PSCCH indicates a subsequent data transmission from the second UE to the first UE on the SL.

[0013] In an additional aspect of the disclosure, an apparatus configured for wireless communication includes means for receiving, by a first UE in communication with a second UE on a SL, a transmission grant from a base station serving the first UE and the second UE, and means for transmitting, by the first UE, SCI in a PSCCH to the second UE. In embodiments, the second UE operates in a DRX mode, and the SCI in the PSCCH is received by the second UE during an active time period of a DRX cycle of the second UE. In embodiments, the SCI includes a configuration for a subsequent data transmission from the first UE to the second UE on the SL. In embodiments, transmitting the SCI in the PSCCH to the second UE causes the second UE to extend the active time period of the DRX cycle of the second UE in which the SCI in the PSCCH is received when the PSCCH indicates the subsequent data transmission from the first UE to the second UE on the SL.

[0014] In an additional aspect of the disclosure, an apparatus configured for wireless communication includes means for transmitting, by a base station serving a first UE and a second UE, a transmission grant to the first UE, the first UE being in communication with the second UE on a SL. In embodiments, the second UE operates in a DRX mode, and the transmission grant causes the first UE to transmit SCI in a PSCCH to the second UE, the SCI including a configuration for a subsequent data transmission from the first UE to the second UE on the SL. In embodiments, the SCI in the PSCCH is received by the second UE during an active time period of a DRX cycle of the second UE, and receiving the SCI in the PSCCH from the first UE causes the second UE to extend the active time period of the DRX cycle of the second UE in which the SCI in the PSCCH is received when the PSCCH indicates the subsequent data transmission from the first UE to the second UE on the SL.

[0015] In an additional aspect of the disclosure, a non-transitory computer-readable medium has program code recorded thereon. The program code further includes code to receive, by a first UE in communication with a second UE on a SL, SCI in a PSCCH from the second UE. In aspects, the first UE operates in a DRX mode, and the PSCCH is received by the first UE during an active time period of a DRX cycle of the first UE. The program code further includes code to extend, in response to receiving the SL control information in the PSCCH from the second UE, the active time period of the DRX cycle in which the SL control information is received in the PSCCH from the second UE when the PSCCH indicates a subsequent data transmission from the second UE to the first UE on the SL.

[0016] In an additional aspect of the disclosure, a non-transitory computer-readable medium has program code recorded thereon. The program code further includes code to receive, by a first UE in communication with a second UE over a SL, a transmission grant from a base station serving the first UE and the second UE, and transmit, by the first UE, SCI in a PSCCH to the second UE. In an embodiment, the second UE operates in a DRX mode, and the SCI in the PSCCH is received by the second UE during an active time period of a DRX cycle of the second UE. In an embodiment, the SCI includes a configuration for a subsequent data transmission from the first UE to the second UE over the SL. In an embodiment, the transmission of the SCI in the PSCCH to the second UE causes the second UE to extend the active time period of the DRX cycle of the second UE in which the SCI in the PSCCH is received when the PSCCH indicates the subsequent data transmission from the first UE to the second UE over the SL.

[0017] In an additional aspect of the disclosure, a non-transitory computer-readable medium has program code recorded thereon. The program code further includes code to transmit, by a base station serving a first UE and a second UE, a transmission grant to the first UE, the first UE being in communication with the second UE over a SL. In an embodiment, the second UE operates in a DRX mode, and the transmission grant causes the first UE to transmit SCI in a PSCCH to the second UE, the SCI including a configuration for a subsequent data transmission from the first UE to the second UE over the SL. In an embodiment, the SCI in the PSCCH is received by the second UE during an active time period of a DRX cycle of the second UE, and the reception of the SCI in the PSCCH from the first UE causes the second UE to extend the active time period of the DRX cycle of the second UE in which the SCI in the PSCCH is received when the PSCCH indicates the subsequent data transmission from the first UE to the second UE over the SL.

[0018] In an additional aspect of the disclosure, an apparatus configured for wireless communication is disclosed. The apparatus includes at least one processor and a memory coupled to the processor. The processor is configured to receive, by a first UE in communication with a second UE over a SL, SCI in a PSCCH from the second UE. In aspects, the first UE operates in a DRX mode, and the PSCCH is received by the first UE during an active time period of a DRX cycle of the first UE. The processor is further configured to, in response to receiving the SL control information in the PSCCH from the second UE, extend the active time period of the DRX cycle in which the SL control information is received in the PSCCH from the second UE when the PSCCH indicates a subsequent data transmission from the second UE to the first UE over the SL.

[0019] In an additional aspect of the disclosure, an apparatus configured for wireless communication is disclosed. The apparatus includes at least one processor and a memory coupled to the processor. The processor is configured to receive, by a first UE in communication with a second UE on a SL, a transmission grant from a base station serving the first UE and the second UE and transmit, by the first UE, SCI in a PSCCH to the second UE. In an embodiment, the second UE operates in a DRX mode and the SCI in the PSCCH is received by the second UE during an active time period of a DRX cycle of the second UE. In an embodiment, the SCI includes a configuration for a subsequent data transmission from the first UE to the second UE on the SL. In an embodiment, transmitting the SCI in the PSCCH to the second UE causes the second UE to extend the active time period of the DRX cycle of the second UE in which the SCI in the PSCCH is received when the PSCCH indicates the subsequent data transmission from the first UE to the second UE on the SL.

[0020] In an additional aspect of the disclosure, an apparatus configured for wireless communication is disclosed. The apparatus includes at least one processor and a memory coupled to the processor. The processor is configured to receive, by a first UE in communication with a second UE on a SL, a transmission grant from a base station serving the first UE and the second UE and transmit, by the first UE, SCI in a PSCCH to the second UE. In an embodiment, the second UE operates in a DRX mode and the SCI in the PSCCH is received by the second UE during an active time period of a DRX cycle of the second UE. In an embodiment, the SCI includes a configuration for a subsequent data transmission from the first UE to the second UE on the SL. In an embodiment, transmitting the SCI in the PSCCH to the second UE causes the second UE to extend the active time period of the DRX cycle of the second UE in which the SCI in the PSCCH is received when the PSCCH indicates the subsequent data transmission from the first UE to the second UE on the SL.

[0021] In an additional aspect of the disclosure, a method of wireless communication includes transmitting, by a first UE in communication with a second UE on a SL, a SL DRX configuration that specifies a SL DRX pattern of the first UE with respect to the SL. In embodiments, the SL DRX pattern of the first UE includes at least one SL DRX cycle having an active time period for reception on the SL and an inactive time period for reception on the SL. The method further includes receiving, by the first UE from the second UE, SL control information (SCI) in a physical SL control channel (PSCCH). In embodiments, the SCI in the PSCCH is received by the first UE during the active time period of the at least one SL DRX cycle of the first UE. The method further includes, responsive to receiving the SCI in the PSCCH from the second UE, extending the active time period of the at least one SL DRX cycle in which the SCI in the PSCCH is received from the second UE when the SCI in the PSCCH indicates a subsequent data transmission on the SL from the second UE to the first UE.

[0022] In an additional aspect of the disclosure, a method of wireless communication includes receiving, by a first UE in communication with a second UE on a SL, a SL DRX configuration that specifies a SL DRX pattern of the second UE with respect to the SL. In embodiments, the SL DRX pattern of the second UE includes at least one SL DRX cycle having an active time period for reception on the SL and an inactive time period for reception on the SL. The method further includes transmitting, by the first UE to the second UE, SCI in a PSCCH. In embodiments, the SCI in the PSCCH is received by the second UE during the active time period of the at least one SL DRX cycle of the second UE, and transmitting the SCI in the PSCCH to the second UE causes the second UE, responsive to receiving the SCI in the PSCCH from the first UE, to extend the active time period of the at least one SL DRX cycle in which the SCI in the PSCCH is received from the first UE when the SCI in the PSCCH indicates a subsequent data transmission on the SL from the first UE to the second UE.

[0023] In an additional aspect of the disclosure, an apparatus for wireless communication includes means for transmitting, by a first UE in communication with a second UE on a SL, a SL DRX configuration that specifies a SL DRX pattern of the first UE with respect to the SL. In embodiments, the SL DRX pattern of the first UE includes at least one SL DRX cycle having an active time period for reception on the SL and an inactive time period for reception on the SL. The apparatus further includes means for receiving, by the first UE from the second UE, SCI in a PSCCH. In embodiments, the SCI in the PSCCH is received by the first UE during the active time period of the at least one SL DRX cycle of the first UE. The apparatus further includes means for extending, responsive to receiving the SCI in the PSCCH from the second UE, the active time period of the at least one SL DRX cycle in which the SCI in the PSCCH is received from the second UE when the SCI in the PSCCH indicates a subsequent data transmission on the SL from the second UE to the first UE.

[0024] In an additional aspect of the disclosure, an apparatus for wireless communication includes means for receiving, by a first UE in communication with a second UE on a SL, a SL DRX configuration that specifies a SL DRX pattern of the second UE with respect to the SL. In embodiments, the SL DRX pattern of the second UE includes at least one SL DRX cycle having an active time period for reception on the SL and an inactive time period for reception on the SL. The apparatus further includes means for transmitting, by the first UE to the second UE, SCI in a PSCCH. In embodiments, the SCI in the PSCCH is received by the second UE during the active time period of the at least one SL DRX cycle of the second UE, and transmitting the SCI in the PSCCH to the second UE causes the second UE to, responsive to receiving the SCI in the PSCCH from the first UE, extend the active time period of the at least one SL DRX cycle in which the SCI in the PSCCH is received from the first UE when the SCI in the PSCCH indicates a subsequent data transmission on the SL from the first UE to the second UE.

[0025] In an additional aspect of the disclosure, a non-transitory computer-readable medium has program code recorded thereon. The program code includes code for receiving, by a first UE in communication with a second UE on a SL, a SL DRX configuration, the SL DRX configuration specifying a SL DRX pattern of the second UE with respect to the SL. In an embodiment, the SL DRX pattern of the second UE includes at least one SL DRX cycle having an active period for reception on the SL and an inactive period for reception on the SL. The program code further includes code for transmitting, by the first UE, SCI in a PSCCH from the second UE. In an embodiment, the SCI in the PSCCH is received by the first UE during the active period of the at least one SL DRX cycle of the second UE. The program code further includes code for extending, in response to receiving the SCI in the PSCCH from the second UE, the active period of the at least one SL DRX cycle in which the SCI in the PSCCH is received from the second UE when the SCI in the PSCCH indicates a subsequent data transmission on the SL from the second UE to the first UE.

[0026] In an additional aspect of the disclosure, a non-transitory computer-readable medium has program code recorded thereon. The program code includes code for receiving, by a first UE in communication with a second UE on a SL, a SL DRX configuration, the SL DRX configuration specifying a SL DRX pattern of the second UE with respect to the SL. In an embodiment, the SL DRX pattern of the second UE includes at least one SL DRX cycle having an active period for reception on the SL and an inactive period for reception on the SL. The program code further includes code for transmitting, by the first UE, SCI in a PSCCH from the second UE. In an embodiment, the SCI in the PSCCH is received by the first UE during the active period of the at least one SL DRX cycle of the second UE. The program code further includes code for extending, in response to receiving the SCI in the PSCCH from the second UE, the active period of the at least one SL DRX cycle in which the SCI in the PSCCH is received from the second UE when the SCI in the PSCCH indicates a subsequent data transmission on the SL from the second UE to the first UE.

[0027] In an additional aspect of the disclosure, an apparatus configured for wireless communication is disclosed. The apparatus includes at least one processor, and a memory coupled to the processor. The processor is configured to transmit, by a first UE in communication with a second UE on a SL, a SL DRX configuration, the SL DRX configuration specifying a SL DRX pattern of the first UE with respect to the SL. In an embodiment, the SL DRX pattern of the first UE includes at least one SL DRX cycle having an active period for reception on the SL and an inactive period for reception on the SL. The processor is further configured to receive, by the first UE from the second UE, SCI in a PSCCH. In an embodiment, the SCI in the PSCCH is received by the first UE during the active period of the at least one SL DRX cycle of the first UE. The processor is further configured to, in response to receiving the SCI in the PSCCH from the second UE, extend the active period of the at least one SL DRX cycle in which the SCI in the PSCCH is received from the second UE when the SCI in the PSCCH indicates a subsequent data transmission on the SL from the second UE to the first UE.

[0028] In an additional aspect of the disclosure, an apparatus configured for wireless communication is disclosed. The apparatus includes at least one processor, and a memory coupled to the processor. The processor is configured to receive, by a first UE in communication with a second UE on a SL, a SL DRX configuration, the SL DRX configuration specifying a SL DRX pattern of the second UE with respect to the SL. In an embodiment, the SL DRX pattern of the second UE includes at least one SL DRX cycle having an active period for reception on the SL and an inactive period for reception on the SL. The processor is further configured to transmit, by the first UE to the second UE, SCI in a PSCCH. In an embodiment, the SCI in the PSCCH is received by the second UE during the active period of the at least one SL DRX cycle of the second UE, and transmitting the SCI in the PSCCH to the second UE causes the second UE, in response to receiving the SCI in the PSCCH from the first UE, to extend the active period of the at least one SL DRX cycle in which the SCI in the PSCCH is received from the first UE when the SCI in the PSCCH indicates a subsequent data transmission on the SL from the first UE to the second UE.

[0029] Other aspects, features, and embodiments will become apparent to those of ordinary skill in the art, upon reviewing the following description of specific, exemplary aspects in conjunction with the accompanying figures. While features can be discussed relative to certain aspects and figures below, all aspects can include one or more of the advantageous features discussed herein. In other words, while one or more aspects can be discussed as having certain advantageous features, one or more of such features can also be used in accordance with the various aspects. In similar fashion, different aspects can be discussed herein in the context of devices, systems or methods. However, other implementations can also accommodate devices, systems or methods without departing from the scope of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0030] A further understanding of the nature and advantages of the disclosure can be realized by reference to the following drawings. In the drawings, like reference numerals can designate similar structures or features. Also, various components of the same type can be distinguished by adding a dash and a second label that distinguishes among the similar components. If only the first reference numeral is used in the specification, the description is applicable to any one of the similar components having the same first reference numeral irrespective of the second reference numeral.

[0031] Figure 1 is a block diagram illustrating details of a wireless communication system in accordance with some aspects of the disclosure.

[0032] Figure 2 is a block diagram conceptually illustrating a design of a base station and a UE configured in accordance with some aspects of the disclosure.

[0033] Figure 3 is a block diagram illustrating details of an example wireless communication system implementing a sidelink communication scheme.

[0034] Figure 4 is a diagram illustrating operation in DRX Mode 1.

[0035] Figure 5 is a diagram illustrating DRX in SL Mode 1 operation implemented in accordance with some aspects of the disclosure.

[0036] Figure 6 is a block diagram illustrating example blocks executed by a user equipment to implement aspects of the present disclosure.

[0037] Figure 7 is a block diagram illustrating example blocks executed by a user equipment to implement aspects of the present disclosure.

[0038] Figure 8 is a block diagram illustrating example blocks executed by a base station to implement aspects of the present disclosure.

[0039] Figure 9 is a block diagram conceptually illustrating a design of a user equipment configured in accordance with some embodiments of the present disclosure.

[0040] Figure 10 is a block diagram conceptually illustrating a design of a base station configured in accordance with some embodiments of the present disclosure.

[0041] Figure 11 is a diagram illustrating DRX in SL Mode-2 operation implemented in accordance with some aspects of the present disclosure.

[0042] Figure 12 is a block diagram illustrating example blocks executed by a user equipment to implement aspects of the present disclosure.

[0043] Figure 13 is a block diagram illustrating example blocks executed by a user equipment to implement aspects of the present disclosure. DETAILED DESCRIPTION

[0044] The DETAILED DESCRIPTION section is intended to aid the understanding of the various configurations described herein, and is not intended to provide the only

[0045] The present disclosure generally relates to providing or participating in an authorized shared access between two or more wireless devices in one or more wireless communication systems, also referred to as wireless communication networks. In various implementations, the techniques and apparatus can be used for wireless communication networks such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single-carrier FDMA (SC-FDMA) networks, LTE networks, GSM networks, 5thGeneration (5G) or new radio (NR) networks (sometimes referred to as “5G NR” networks / devices / systems) and other communications networks. As described herein, the terms “network” and “system” can be used interchangeably.

[0046] A CDMA network, for example, can implement a radio technology such as universal terrestrial radio access (UTRA), cdma2000, and so on. UTRA includes wideband-CDMA (W-CDMA) and low chip rate (LCR). CDMA2000 covers IS-2000, IS-95, and IS-856 standards.

[0047] A TDMA network can implement a radio technology such as Global System for Mobile Communications (GSM). The third Generation Partnership Project (3GPP) defines standards for the GSM EDGE (enhanced data rates for GSM evolution) radio access network (RAN) also denoted as GERAN. GERAN is the radio component of a GSM / EDGE network alongside with the network's base stations (such as the Ater and Abis interfaces) and the base station controllers (A interfaces, etc.). The radio access network represents the component of a GSM network that phones and packet data route to and from the Public Switched Telephone Network (PSTN) and Internet through which they connect to the mobile handsets (also known as user terminals or user equipments (UEs)). A mobile phone operator's network can comprise one or more GERANs, which can couple with a Universal Terrestrial Radio Access Network (UTRAN) in the case of a UMTS / GSM network. Additionally, an operator network can also include one or more LTE networks and / or one or more other networks. The various different network types can use different radio access technologies (RATs) and radio access networks (RANs).

[0048] An OFDMA network can implement a radio technology such as evolved UTRA (E- UTRA), IEEE 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM, etc. UTRA, E-UTRA, and Global System for Mobile Communications (GSM) are part of universal mobile telecommunication system (UMTS). In particular, long term evolution (LTE) is a release of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS, and LTE are described in documents from the organization named "3rd Generation Partnership Project" (3GPP) and cdma2000 is described in documents from the organization named "3rd Generation Partnership Project 2" (3GPP2). These various radio technologies and standards are known or are being developed. For example, 3GPP is a collaboration between groups of telecommunications associations that aims to define a globally applicable third generation (3G) mobile phone specification. 3GPP long term evolution (LTE) is a 3GPP project that aims to improve the universal mobile telecommunications system (UMTS) mobile phone standard. 3GPP can define specifications for the next generation of mobile networks, mobile systems, and mobile devices. The present disclosure can describe certain aspects with reference to LTE, 4G, or 5G NR technology; however, the description is not intended to be limited to a particular technology or application and one or more aspects described with reference to one technology can be understood to be applicable to another technology. Indeed, one or more aspects of the present disclosure relate to shared access to wireless spectrum between networks using different radio access technologies or radio air interfaces.

[0049] 5G networks contemplate diverse deployments, diverse spectrum, and diverse services and devices that can be implemented using a unified, OFDM- based air interface. To meet these goals, further enhancements to LTE and LTE-A are considered in addition to development of the new radio technology for 5G NR networks. 5G NR will be capable of scaling to deliver extreme mobile broadband and low latency connectivity for a wide range of use cases, including eMBB, URLL, and eV2V, as well as critical communications applications. These applications will require a high degree of reliability and low latency, as well as support for a broad range of deployment scenarios.

[0050] 5G NR devices, networks, and systems can be implemented to use waveform characteristics that are based on optimized OFDM. These characteristics can include scalable numerology and transmission time intervals (TTIs); a common, flexible framework that can effectively multiplex services and features through dynamic, low-latency time -division duplex (TDD) / frequency-division duplex (FDD) design; and advanced wireless technologies such as massive

[0051] The scalable numerology of 5G NR facilitates scalable TTIs for diverse latency and quality of service (QoS) requirements. For example, shorter TTIs can be used for low latency and high reliability, while longer TTIs can be used for higher spectral efficiency. Efficient multiplexing of long and short TTIs allows transmissions to start on symbol boundaries. 5G NR also contemplates a self-contained, integrated subframe design with uplink / downlink scheduling information, data, and acknowledgements in the same subframe. The self-contained, integrated subframe supports communications in unlicensed or contention-based shared spectrum, can be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet current traffic demands.

[0052] For clarity, certain aspects of the apparatus and techniques can be described below with reference to example 5G NR implementations or in a 5G-centric manner; however, the description is not intended to be limited to 5G applications.

[0053] Furthermore, it should be appreciated that wireless communication networks adapted according to the concepts herein can operate with any combination of licensed or unlicensed spectrum according to the requirements of the network and available functionality; thus, the descriptions provided below in connection with unlicensed spectrum apply to similar implementations involving unlicensed spectrum unless otherwise specifically stated. It further should be appreciated that the descriptions and implementations provided below are not limited to 5G NR applications, and can be extended to other communications systems and applications where the principles of the concepts described herein can apply.

[0054] While aspects and implementations are described in this application by illustration to some examples, those skilled in the art will understand that additional implementations and use cases can come about in many different arrangements and scenarios. The innovations described herein can be implemented across many differing platform types, devices, systems, form factors, and configurations. For example, embodiments and / or uses can come about via integrated chip implementations and / or other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / purchasing devices, medical devices, AI-enabled devices, etc.). While some examples can or can not be specifically directed to use cases or applications, a wide assortment of applicability of the innovations described throughout this specification can occur. Implementations can range from chip-level or modular components to non-modular, non-chip-level implementations and further to aggregated, distributed, or OEM devices or systems incorporating one or more described aspects. In some practical settings, devices incorporating described aspects and features can also necessarily include additional components and features that may

[0055] Figure 1 is a block diagram illustrating details of an example wireless communication system. The wireless communication system can include a wireless network 100. The wireless network 100 can include, for example, a 5G wireless network. As recognized by those skilled in the art, the components appearing in Figure 1 The components appearing in can likely have related counterpart components in other network arrangements, including, for example, cellular-style network arrangements as well as non-cellular-style network arrangements (e.g., device-to-device or peer-to-peer or ad hoc network arrangements, etc.).

[0056] Figure 1 The wireless network 100 illustrated in includes a number of base stations 105 and other network entities. A base station can be a station that communicates with UEs and can also be referred to as an evolved node B (eNB), a next generation eNB (gNB), an access point, etc. Each base station 105 can provide communication coverage for a particular geographic area. In 3GPP, the term "cell" can refer to this particular geographic coverage area of a base station and / or a base station subsystem serving the coverage area, depending on the context in which the term is used. In implementations of the wireless network 100 herein, a base station 105 can be associated with a same operator or different operators (e.g., the wireless network 100 can include a plurality of operator wireless networks). Additionally, in implementations of the wireless network 100 herein, a base station 105 can provide wireless communication

[0057] A base station can provide communication coverage for a macro cell or a small cell, such as a pico cell or a femto cell, and / or other types of cells. A macro cell can generally cover a relatively large geographic area (e.g., several kilometers in radius) and can allow unrestricted access by UEs with service subscriptions with the network provider. A small cell, such as a pico cell, can also cover a relatively small geographic area and can allow restricted access by UEs, such as UEs in an association with the small cell (e.g., UEs in a closed subscriber group (CSG), UEs for a family of users, etc.). A base station for a macro cell can be referred to as a macro base station. A base station for a small cell can be referred to as a small cell base station, a pico base station, a femto base station, or a home base station. In implementations, base stations 105 can include or can be associated with base station Figure 1In the illustrated example, the base stations 105d and 105e are regular macro base stations while the base stations 105a-105c are macro base stations that utilize one of three-dimensional (3D), full dimensional (FD) or massive MIMO. The base stations 105a-105c utilize their higher dimension MIMO capabilities to increase coverage and capacity using 3D beamforming in both elevation and azimuth dimensions. The base station 105f is a small cell base station, which can be a home node or an access point for an enterprise. The base stations can support one or multiple (e.g., two, three, four, etc.) cells.

[0058] The wireless network 100 can support synchronous or asynchronous operation. For synchronous operation, the base stations can have similar frame timing, and transmissions from different base stations can be approximately aligned in time. For asynchronous operation, the base stations can have different frame timing, and transmissions from different base stations can not be aligned in time. In some cases, the network can be enabled or configured to handle dynamic switching between synchronous or asynchronous operations.

[0059] The UEs 115 are dispersed throughout the wireless network 100, and each UE can be stationary or mobile. It should be appreciated that, although a mobile apparatus is commonly referred to as a user equipment (UE) in standards and specifications issued by the 3GPP, such an apparatus can also be referred to by one skilled in the art as a mobile station (MS), a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal (AT), a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, a gaming device, an augmented reality device, a vehicular component device / module, or some other suitable terminology. In the present document, a “mobile” apparatus or UE need not necessarily have a capability to move, and can be fixed (e.g., static). Some non-limiting examples of a mobile apparatus, such as can comprise implementations of one or more UEs 115, include a mobile, a cell phone, a smartphone, a tablet, a laptop, a personal computer (PC), a notebook, a netbook, a smartbook, a tablet, a personal digital assistant (PDA), and so on. A mobile apparatus can additionally, or alternatively, be an “Internet of Things’ (IoT) or “Internet of Everything’ (IoE) device. Such devices can include, for example, an automotive or other transportation vehicle, a satellite radio, a global positioning system (GPS) device, a logistics controller, a drone, a multi-copter, a quad-copter, a smart energy or security device, a solar panel or solar array, municipal lighting, water, or other infrastructure; an industrial automation and enterprise device; a consumer and wearable device, such as eyewear, a wearable camera, a smartwatch, a health or fitness tracker, a mammal-implantable device, a gesture-tracking device, a medical device, a digital audio player (e.g., MP3 player), a camera, a game console, etc.; and a digital home or smart home device, such as a home audio, video, and multimedia device, an appliance, a sensor, a vending machine, intelligent lighting, a home security system, a smart meter, etc. In one aspect, a UE can be a device that includes a Universal Integrated Circuit Card (UICC). In another aspect, a UE can be a device that does not include a UICC. In some aspects, a UE that does not include a UICC can also be referred to as an loE device. Figure 1 The UEs 115a-115d illustrated in FIG. 1 A are exemplary mobile smart phone-type devices accessing the wireless network 100. A UE can also be a machine specifically configured for connected communication, including machine type communication (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT), and the like. Figure 1 The UEs 115e-115k illustrated in FIG. 1A are exemplary of a variety of

[0060] Mobile devices such as UE 115 can be able to communicate with any type of base station, whether macro base station, pico base station, femto base station, relay, and the like. In Figure 1 In general, communication links (indicated as x's) between UEs, between a UE and a serving base station, and between base stations represent wireless transmissions between wireless devices associated with the network 100. In these embodiments, the base stations 105a-105d can communicate with one another using wired or wireless communication links over the backhaul network 190. Similarly, the base stations 105e-105g can communicate with one another using wired or wireless communication links over the backhaul network 190. In these embodiments, the base stations 105a-105d and the base stations 105e-105g can communicate using wired or wireless communication links over the backhaul network 190.

[0061] In operation, at the wireless network 100, the base stations 105a-105c serve the UEs 115a and 115b using 3D beamforming and coordinated spatial techniques, such as coordinated multipoint (CoMP) or multi-connectivity. The macro base station 105d performs backhaul communications with the base stations 105a-105c and the small cell base station 105f. The macro base station 105d also transmits multicast services which are subscribed to and received by the UEs 115c and 115d. Such multicast services can include mobile television or stream video, or can include

[0062] The wireless network 100 of implementations supports mission critical

[0063] Figure 2 FIG. illustrates block diagrams of example designs of a base station 105 and a UE 115, which can be any of the base stations and one of the UEs in Figure 1 In a restricted association scenario (as described above), the base station 105 can be a Figure 1The small cell base station 105f in the example of FIG. 1 A can be a femto cell base station 105f and the UE 115 can be the UE 115c or 115D operating in the service area of the femto cell base station 105f, which can be included in a list of accessible UEs for the femto cell base station 105f in order to access the femto cell base station 105f. The base station 105 can also be a base station of some other type. As Figure 2 As shown in the example of FIG. 1 A, base station 105 can be equipped with antennas 234a through 234t, and UE 115 can be equipped with antennas 252a through 252r, for facilitating wireless communications.

[0064] At the base station 105, a transmit processor 220 can receive data from a data source 212 and control information from a controller / processor 240. The control information can be for the physical broadcast channel (PBCH), physical control format indicator channel (PCFICH), physical hybrid ARQ (automatic repeat request) indicator channel (PHICH), physical downlink control channel (PDCCH), enhanced physical downlink control channel (EPDCCH), MTC physical downlink control channel (MPDCCH), etc. The data can be for the PDSCH, etc. In addition, the transmit processor 220 can process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. The transmit processor 220 can also generate reference symbols, e.g., for the primary synchronization signal (PSS) and secondary synchronization signal (SSS), and cell-specific reference signals. A transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing on the data symbols, the control symbols, and / or the reference symbols, if applicable, and can provide output symbol streams to the modulators (MODs) 232a through 232t. For example, spatial processing of the data symbols, control symbols, or reference symbols can include precoding. Each modulator 232 can process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 can additionally or alternatively process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. Downlink signals from modulators 232a through 232t can be transmitted via the antennas 234a through 234t, respectively.

[0065] At UE 115, antennas 252a to 252r can receive downlink signals from base station 105 and can respectively provide the received signals to demodulators (DEMODs) 254a to 254r. Each demodulator 254 can adjust (e.g., filter, amplify, downconvert, and digitize) the corresponding received signal to obtain input samples. Each demodulator 254 can further process the input samples (e.g., for OFDM) to obtain received symbols. MIMO detector 256 can obtain received symbols from demodulators 254a to 254r, perform MIMO detection on the received symbols when needed, and provide the detected symbols. Receiver processor 258 can process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide data for decoding for UE 115 to data sink 260, and provide decoding control information to controller / processor 280.

[0066] On the uplink, at UE 115, the transmitting processor 264 can receive and process data from data source 262 (e.g., for the Physical Uplink Shared Channel (PUSCH)) and control information from controller / processor 280 (e.g., for the Physical Uplink Control Channel (PUCCH)). Additionally, the transmitting processor 264 can generate reference symbols for reference signals. Symbols from the transmitting processor 264 can be pre-encoded by the TX MIMO processor 266 when needed, further processed by modulators 254a to 254r (e.g., for SC-FDM, etc.), and transmitted to base station 105. At base station 105, the uplink signal from UE 115 can be received by antenna 234, processed by demodulator 232, detected by MIMO detector 236 when needed, and further processed by receiving processor 238 to obtain decoded data and control information transmitted by UE 115. Receiving processor 238 can provide the decoded data to data sink 239 and the decoded control information to controller / processor 240.

[0067] Controllers / processors 240 and 280 can respectively direct operations at base station 105 and UE 115. Controllers / processors 240 and / or other processors and modules at base station 105 and / or controllers / processors 280 and / or other processors or modules at UE 115 can perform or direct the execution of various processes used in the techniques described herein (e.g., to perform or direct...). Figures 6 to 8 The execution shown herein, and / or the execution of other processes used in the techniques described herein. Memory 242 and 282 may store data and program code for base station 105 and UE 115, respectively. Scheduler 244 may schedule the UE for data transmission on the downlink and / or uplink.

[0068] Wireless communications systems operated by different network operating entities (e.g., network operators) can share spectrum. In some cases, a network operating entity can be configured to use an entire designated shared spectrum for at least a period of time before another network operating entity uses the entire designated shared spectrum for different time periods. Thus, to allow network operating entities to use the full designated shared spectrum, and to mitigate interfering communications between different network operating entities, certain resources (e.g., time) can be partitioned and allocated to different network operating entities for certain types of communications.

[0069] For example, a network operating entity can be allocated certain time resources that the network operating entity reserves for exclusive communications by the network operating entity using the entire shared spectrum. The network operating entity can also be allocated other time resources in which the entity is given priority over other network operating entities using the shared spectrum for communications. These time resources that are used with priority by a network operating entity can be utilized by other network operating entities on an opportunistic basis if the prioritized network operating entity does not use the resources. Additional time resources can be allocated for any network operator to use on an opportunistic basis.

[0070] Access to the shared spectrum and arbitration of time resources among different network operating entities can be centrally controlled by a separate entity, autonomously determined by a predefined arbitration scheme, or dynamically determined based on interactions among wireless nodes of the network operators.

[0071] In some cases, UEs 115 and base stations 105 can operate in a shared radio frequency spectrum band, which can include licensed or unlicensed (e.g., contention-based) frequency spectrum. In an unlicensed frequency portion of the shared radio frequency spectrum band, UEs 115 or base stations 105 can traditionally perform a clear channel assessment (CCA) to contend for access to the frequency spectrum. For example, UEs 115 or base stations 105 can perform a listen before talk or listen before transmit (LBT) procedure, such as a clear channel assessment (CCA), prior to communicating to determine whether the shared channel is available. In some implementations, a CCA can include an energy detection procedure to determine whether there are any other active transmissions. For example, a device can infer that a change in a received signal strength indicator (RSSI) of a power meter indicates that the channel is occupied. Specifically, a signal power that is concentrated in certain bandwidth and exceeds a predetermined noise floor can indicate another wireless transmitter. A CCA can also include detection of certain sequences indicating use of the channel. For example, another device can transmit a particular preamble prior to a data sequence transmission. In some cases, an LBT procedure can include a wireless node adjusting its own back-off window based on an amount of energy detected on the channel and / or acknowledgement / negative-acknowledgement (ACK / NACK) feedback of its own transmitted packets as a proxy for collisions.

[0072] Figure 3 This is a block diagram illustrating details of an example wireless communication system. The wireless communication system may include an implementation of a wireless network 100. The wireless network 100 may include a base station 105z, a UE 115x, and a UE 115y. It should be understood that the network 100 may include additional components, such as additional base stations and additional UEs. Therefore, regarding... Figure 3 The discussion of base station 105z, UE 115x, and UE 115y is by way of example and is not intended to be limiting in any way. Specifically, UE 115x and UE 115y can communicate with base station 105z. For example, UE 115x can communicate with base station 105z via link 352. Link 352 may include an uplink and / or a downlink. In some examples, UE 115y can communicate with base station 105z via link 351. Link 351 may include an uplink and / or a downlink. In some implementations, base station 105z may be the serving base station of one or both of UE 115x and UE 115y.

[0073] like Figure 3 As shown, UE 115x and UE 115y can communicate with each other via SL 350. In some cases, SL 350 can be a direct link, through which UE 115x sends / receives messages directly to / from UE 115y, and UE 115y sends / receives messages directly to / from UE 115x. In some implementations, UE 115x and UE 115y can be configured to follow an SL communication scheme, where transmission / reception occurs only within specified resources (e.g., time, frequency, etc.). Therefore, SL communication between UE 115x and UE 115y may be limited to specific resources, and in these implementations, SL communication between UE 115x and UE 115y may not occur outside of these resources.

[0074] In some implementations, SL communications between UE 115x and UE 115y can operate in one of various modes. For example, SL communications between UE 115x and UE 115y on SL 350 can operate in SL Mode 1. In SL Mode 1, a base station (e.g., base station 105z) can schedule SL transmissions. For example, in SL Mode 1, a UE can transmit on the SL to another UE, but the transmitting UE must obtain a transmission grant from a serving base station before it is allowed to transmit on the SL to the receiving UE. In SL Mode 1, the transmitting UE is not allowed to transmit on the SL to the receiving UE without requesting a transmission grant. For example, UE 115x can wish to transmit on SL 350 to UE 115y. In that case, UE 115x can transmit a request for a transmission grant to base station 105z. The request for a transmission grant can be transmitted on an uplink from UE 115x to base station 105z. Once the base station grants the transmission grant to UE 115x, UE 115x can transmit on SL 350 to UE 115y.

[0075] In implementations, the transmission grant can be transmitted on a downlink from base station 105z to UE 115x (e.g., in a downlink control information (DCI) message). The transmission grant can be provided in a DCI message that includes a resource allocation to the transmitting UE. The transmission grant can be provided in a DCI message that includes a resource allocation to the transmitting UE. For example, a transmission grant from base station 105z can include an indication to the transmitting UE of which resources to use to transmit a SL transmission on the SL to the receiving UE. For example, a transmission grant transmitted by base station 105z to UE 115x can include an indication of which resources UE 115x is to use when transmitting to UE 115y.

[0076] In another example, SL communications between UE 115x and UE 115y on SL 350 can operate in SL Mode 2. In SL Mode 2, a UE (e.g., UE 115x and / or UE 115y) can schedule SL transmissions on the SL to another UE. For example, in SL Mode 2, a UE can transmit on the SL to another UE without the transmitting UE needing to obtain a transmission grant from a serving base station before it is allowed to transmit on the SL to the receiving UE. For example, UE 115x can wish to transmit on SL 350 to UE 115y. In that case, UE 115x can schedule a SL transmission to UE 115y and does not need to request a transmission grant from base station 105z or another base station. On the other hand, in Mode 1, the transmitting UE must obtain a transmission grant from a serving base station before it can transmit on the SL to another UE.

[0077] In some implementations, SL transmissions may follow a specific scheme. For example, once UE 115x receives a transmission grant, UE 115x may send SL Control Information (SCI) to UE 115y (e.g., using resources specified in the transmission grant). In one implementation, the SCI may be sent from UE 115x to UE 115y on the Physical SL Control Channel (PSCCH). The SCI may be configured to instruct UE 115y that UE 115x intends to send subsequent data transmissions to UE 115y (e.g., data transmissions on SL 350 from UE 115x following the SCI transmission from UE 115x). In another implementation, the subsequent data transmissions may be data transmissions from UE 115x to UE 115y on the Physical SL Shared Channel (PSSCH). In yet another implementation, the SCI may include an indication of which resources UE 115x will use (e.g., on the PSSCH) to send the subsequent data transmissions, as well as other transmission parameters.

[0078] In this implementation, after sending an SCI to UE 115x, UE 115x can use the resources specified in the SCI to send subsequent data transmissions on the PSSCH. In some cases, UE 115x can provide feedback after receiving a PSSCH transmission (e.g., on the Physical SL Feedback Channel (PSFCH)).

[0079] In some implementations, the UE (e.g., Figure 3 The UE 115y can operate in Discontinuous Receive (DRX) mode. Figure 4 This diagram illustrates UE operation in DRX mode. It can be seen that in DRX mode, UE 115y can discontinuously monitor transmissions from base station 105z (e.g., transmissions of control information such as DCI on the PDCCH). In these cases, UE 115y can monitor DCI during active periods, but may not monitor DCI outside of active periods (e.g., during inactive periods). For example, as... Figure 4 As shown, UE 115y can be configured to include one or more DRX cycles (e.g., 450-452). The DRX cycle of UE 115y can include active and inactive periods. For example, DRX cycles 450-452 can each include active periods 400-402. In these implementations, UE 115y can monitor control information from base station 105z only during active periods 400-402. Figure 4As shown, each DRX cycle of UE 115y begins with an active period during which UE 115y monitors for DCI transmissions from base station 105z. For example, DRX cycle 450 begins with active period 400, DRX cycle 451 begins with active period 401, and DRX cycle 452 begins with active period 402.

[0080] In implementations, a base station that wishes to transmit data to a DRX UE can first transmit a wake-up signal (WUS) to the DRX UE to ensure that the UE is “awake” during the next active period, thereby ensuring that any transmissions (e.g., DCI transmissions) are detected and received by the DRX UE during the next active period. In this case, UE 115y can even monitor for the WUS during an inactive period. For example, base station 105z can transmit WUS 410 to UE 115y during the inactive period of DRX cycle 450. In response to receiving WUS 410, UE 115y can monitor for DCI transmissions from base station 105z (e.g., on the PDCCH) during active period 401 of DRX cycle 451. In some cases, UE 115y can power up its transceiver and / or any other components in order to receive the DCI transmissions. In some implementations, in the case that a WUS is not received, UE 115y can not be configured or receive DCI even during active periods.

[0081] In implementations, in response to receiving a PDCCH transmission (e.g., a DCI on the PDCCH), the active period in which the PDCCH including the DCI is received is extended. In some cases, the active period is extended by starting and / or restarting an inactivity timer associated with the DRX cycle in which the PDCCH is received. For example, as shown, in response to UE 115y receiving DCI on PDCCH 430, active period 401 can be extended by extension period 420 after the end of the PDCCH reception. Figure 4

[0082] However, current DRX communication schemes do not address SL communication between UE 115x and UE 115y over SL 350. In this case, UE 115y is not configured for DRX communication with respect to UE 115x. As such, SL communication between UE 115x and 115y is not possible when UE 115y is operating in DRX mode. On the other hand, to support SL communication, UE 115y would be unable to operate in DRX mode, and thus any power savings due to DRX mode would be lost. More importantly, there are currently no existing solutions to address these deficiencies of existing systems.

[0083] ​Various aspects of the present disclosure relate to systems and methods for configuring and providing sidelink DRX communications. In aspects, the techniques disclosed herein can be applicable to sidelink operation under Mode 1 and / or Mode 2.

[0084] Aspects of the present disclosure provide for a DRX scheme implemented by a UE operating in SL Mode 1 in which the UE operating in SL Mode 1 is able to provide DRX communications with a serving base station while maintaining DRX communications on the SL with another UE. In some embodiments, the DRX scheme between the DRX UE and the base station can be extended to reception on the SL from the transmitting UE. In aspects, the DRX UE can monitor one or both of transmissions in the DL (e.g., from the base station) and in the SL (e.g., from the transmitting SL UE), and can extend an active period (e.g., by starting / restarting an inactivity timer as described above) based on an event related to either the link with the base station or the SL with the other UE. In embodiments, the DRX UE can be configured to start or restart an inactivity timer (e.g., based on a drx-InactivityTimer parameter) in the first symbol after the end of PDCCH reception when the PDCCH indicates a subsequent transmission (either a downlink transmission or an uplink transmission), or in the first symbol after the end of PSCCH reception when the PSCCH indicates a subsequent SL transmission. In aspects, the described techniques can be referred to as DRX with SL under Mode 1.

[0085] Aspects of the disclosure provide for a DRX scheme implemented by a UE operating in SL Mode 2 in which the UE is able to provide DRX communication with a serving base station while in SL Mode 2, while simultaneously maintaining DRX communication on the SL with another UE. In some embodiments, in addition to a Uu DRX scheme between the DRX UE and the base station, a SL DRX scheme for communication on the SL between the DRX UE and the other UE can also be provided. In aspects, the DRX UE can use a SL DRX configuration to monitor the SL for transmissions from the other UE, and can simultaneously use a Uu DRX configuration to monitor the DL (e.g., from the base station) for transmissions, where the SL DRX configuration and the Uu DRX configuration can be different. In embodiments, an active period of a SL DRX cycle (e.g., a DRX cycle of a SL DRX configuration for the SL between the DRX UE and the other UE) can be extended (e.g., by starting / restarting an inactivity timer) based on an event with respect to the SL. In further embodiments, an active period of a Uu DRX cycle (e.g., a DRX cycle of a Uu DRX configuration for a link between the base station and the DRX UE) can be extended (e.g., by starting / restarting an inactivity timer) based on an event with respect to the link between the base station and the DRX UE.

[0086] In embodiments, the DRX UE can be configured to start or restart an inactivity timer of a SL DRX cycle in the first symbol after the end of a reception of a control channel (e.g., a physical SL control channel (PSCCH)) when the PSCCH indicates a subsequent SL transmission from the other UE. In embodiments, the DRX UE can be configured to start or restart an inactivity timer of a Uu DRX cycle in the first symbol after the end of a reception of a control channel (e.g., a PDCCH)) when the PDCCH indicates a subsequent transmission (downlink transmission or uplink transmission) from the base station. In aspects, the described techniques can be referred to as DRX with SL in Mode 2.

[0087] Figure 5 FIG. 1 is a diagram illustrating an example implementation of a SL DRX procedure for implementing one aspect of the disclosure. As shown in FIG. 1, a DRX UE 102 can be configured to communicate with a base station 104 and another UE 106. In aspects, the DRX UE 102 can be configured to communicate with the base station 104 using a Uu DRX configuration 108 and with the other UE 106 using a SL DRX configuration 110. In aspects, the Uu DRX configuration 108 and the SL DRX configuration 110 can be different. In aspects, the Uu DRX configuration 108 can be configured to provide for DRX communication between the DRX UE 102 and the base station 104, while the SL DRX configuration 110 can be configured to provide for DRX communication between the DRX UE 102 and the other UE 106. Figure 5As shown, base station 105z can be in DRX communication with UE 115y over link 351. At the same time, UE 115y can also be in SL DRX communication with UE 115x over SL 350. As shown, UE 115y can be configured to include one or more DRX cycles (e.g., 550-552). The DRX cycles of UE 115y can include active periods and inactive periods. For example, DRX cycles 550-552 can include active periods 500-502, respectively. In these aspects, UE 115y can only monitor for control information from base station 105z and / or from UE 115x during active periods 500-502. In these aspects, UE 115y can monitor for DCI and / or SCI during active periods, but can not monitor for DCI and / or SCI outside of active periods (e.g., during inactive periods). When UE 115y detects or receives DCI (e.g., in PDCCH) and / or SCI (e.g., in PSCCH) during an active period, the active period in which the DCI and / or SCI is received can be extended. In this sense, the active periods of the DRX cycles of UE 115y can be a function of events in the link between base station 105z and UE 115y and in the SL between UE 115y and UE 115x.

[0088] As Figure 5 shown, each DRX cycle of UE 115y begins with an active period during which UE 115y monitors for DCI transmissions from base station 105z and / or monitors for SCI from UE 115x. For example, DRX cycle 550 begins with active period 500, DRX cycle 551 begins with active period 501, and DRX cycle 552 begins with active period 502.

[0089] In Figure 5In the specific example shown, base station 105z may send DCI to UE 115y in PDCCH 530 during the active period 501 of DRX cycle 551. In some embodiments, WUS may be sent from base station 105z to UE 115y before the transmission of PDCCH 530 to ensure that UE 115y is monitoring PDCCH 530 during active period 501. As described above, in response to receiving PDCCH transmission (e.g., DCI transmission on PDCCH 530), UE 115y may extend active period 501 by an extension period 520 when the DCI in PDCCH 530 indicates that subsequent data transmission will be sent from base station 105z to UE 115y. In an embodiment, subsequent data transmission may be received by UE 115y during the extended active period. In an embodiment, active period 501 may be extended by starting and / or restarting an inactive timer associated with DRX cycle 551.

[0090] Also Figure 5 As shown, SL resources 560a-d can occur during DRX cycles 550-552. As described above, SL transmissions between UEs 115x and 115y can be confined or limited to these SL resources 560a-d. Thus, UE 115x can use any of SL resources 560a-d for transmission based on authorization from base station 105z. For example, UE 115x may expect to transmit data to UE 115y on SL 350. In this case, UE 115x can send a request for transmission authorization to base station 105z (e.g., via the uplink of link 351). In some embodiments, the transmission authorization request sent by UE 115x may include an indication that the requested transmission authorization is for transmission to UE 115y on SL 350. In additional or alternative embodiments, the transmission authorization request sent by UE 115x may not include an explicit indication that the requested transmission authorization is for transmission to UE 115y on SL 350. In these cases, base station 105z can determine, based on the buffer status report (BSR) from UE 115x, that the target of the transmission grant request from UE 115x can be UE 115y.

[0091] In aspects, the base station 105z can grant the request of the UE 115x for a transmission grant to transmit on the SL 350. In this case, the base station 105z can transmit the transmission grant to the UE 115x. In embodiments, the transmission grant can include an indication that the requested transmission grant is for a transmission to the UE 115y on the SL 350. In embodiments, the transmission grant can be provided to the UE 115x in a DCI message that includes a resource allocation of SL resources in which the UE 115x can transmit to the UE 115y. In embodiments, the allocated SL resources can be a portion of the SL resources to which the SL communication can be limited. For example, the base station 105z can allocate the SL resources 560d to the UE 115x for transmitting data to the UE 115y. In this example, the SL resources 560d fall within the active period 502 of the DRX cycle 552.

[0092] In embodiments, the UE 115y can monitor for SCI transmissions from the UE 115x during the active period 502. In some embodiments, the base station 105z can transmit a WUS 510 to the UE 115y to ensure that the UE 115y is monitoring for SCI transmissions on the SL in the SL resources 560d during the active period 502 prior to the SCI transmission in the SL resources 506d from the UE 115x. In embodiments, the WUS 510 can be transmitted by the base station 105z to the UE 115y in response to the base station 105z granting the transmission grant to the UE 115x.

[0093] In embodiments, upon receiving the transmission grant to transmit to the UE 115y on the SL 350 in the SL resources 560d, the UE 115x can transmit control information (e.g., SCI) to the UE 115y in a PSCCH on the SL 350 in the SL resources 560d. In embodiments, the SCI can include an indication of which resources the UE 115x will use to send a subsequent data transmission (e.g., a data transmission on a PSSCH) as well as other transmission parameters.

[0094] In implementations, upon transmitting the SCI to the UE 115y on the SL 350 in the SL resources 560d during the active period 502, the UE 115x can transmit a subsequent data transmission on a PSSCH using the resources specified in the SCI. In some cases, the UE 115y can provide feedback (e.g., on a PSFCH) upon receiving the PSSCH transmission.

[0095] In embodiments, UE 115y can extend active period 502 by extension period 521 in response to receiving a SCI transmission in a PSCCH in SL resources 560d during active period 502. In embodiments, UE 115y can extend active period 502 when the SCI in the PSCCH indicates that a subsequent data transmission is to be transmitted from UE 115x to UE 115y.

[0096] In some embodiments, base station 105z can transmit data (e.g., DCI) to UE 115y during the extended active period of DRX cycle 552. In embodiments, active period 502 can be extended by starting and / or restarting an inactivity timer associated with DRX cycle 552.

[0097] Figure 6 is a block diagram illustrating example blocks executed to implement one aspect of the present disclosure. The example blocks are also described with respect to the UE 115 shown in Figure 9 is described with respect to the UE 115 shown in Figure 9 is a block diagram illustrating a UE 115 configured in accordance with one aspect of the present disclosure. UE 115 includes structure, hardware, and components shown with respect to the UE 115 in Figure 2 The UE 115, under the control of controller / processor 280, transmits and receives signals via wireless radios 901a-r and antennas 252a-r. Wireless radios 901a-r include components as described with respect to the various components and hardware shown in Figure 2 The various components and hardware shown with respect to the UE 115 in

[0098] It is noted that Figure 6 The description of the example blocks of FIG. 13 is from the perspective of a first UE, which can refer to a UE operating in SL in DRX under Mode 1 (e.g., UE 115y described above). In this example, the first UE can be in SL communication with a second UE (e.g., UE 115x). In embodiments, a base station (e.g., base station 105z) can serve one or both of the first UE and the second UE.

[0099] At block 600, a first UE in communication with a second UE on a SL receives SCI from the second UE in a PSCCH on the SL. For example, a first UE (e.g., UE 115) in communication on the SL can receive the SCI via antennas 252a-r and wireless radios 901a-r. In aspects, as described above, the first UE can be operating in a DRX mode (e.g., DRX mode 1), and the PSCCH can be received by the first UE during an active period of a DRX cycle of the first UE.

[0100] In embodiments, the SCI received from the second UE in the PSCCH on the SL can be transmitted by the second UE in response to the second UE receiving a transmission grant from a base station. In this case, as will be described in more detail below with respect to FIG. 6B, the second UE can request the transmission grant from the base station, and the transmission grant request can include an indication that the first UE of the second UE is a target receiver of SL transmissions of the second UE. In some embodiments, the second UE can not include the indication, and instead the base station can determine that the first UE is a target receiver of SL transmissions of the second UE based on a BSR associated with the second UE. Figure 7 In more detail, the second UE can request the transmission grant from the base station, and the transmission grant request can include an indication that the first UE of the second UE is a target receiver of SL transmissions of the second UE. In some embodiments, the second UE can not include the indication, and instead the base station can determine that the first UE is a target receiver of SL transmissions of the second UE based on a BSR associated with the second UE.

[0101] In embodiments, the transmission grant can include an indication that the SCI transmission and a subsequent data transmission are to be on a SL from the second UE to the first UE, and that the first UE is an intended target of the SL transmissions. In embodiments, the indication that the subsequent data transmission on the sidelink is intended for the first UE is included in a DCI message transmitted from the base station to the second UE.

[0102] In embodiments, the transmission grant can include a configuration for transmission of the SCI to the first UE on the SL. In embodiments, the configuration can include specifying which SL resources the second UE is to use to transmit the SCI, and in some embodiments, the subsequent data transmission.

[0103] In some embodiments, the first UE receives a WUS from the base station prior to receiving the SCI from the second UE in the PSCCH. Based on receiving the WUS, the first UE can be activated to receive during an active time. In embodiments, the first UE monitors the SL between the first UE and the second UE for transmission of the SCI from the second UE in response to receiving the WUS from the base station. In embodiments, the WUS is transmitted from the base station to the first UE in response to the base station granting a transmission grant to the second UE.

[0104] At block 601, the first UE, in response to receiving SCI in a PSCCH from a second UE, extends an active time period of a DRX cycle in which the SCI in the PSCCH is received from the second UE when the PSCCH indicates that a subsequent data transmission is to be transmitted from the second UE to the first UE on a SL. To enable functionality for such operations, the UE 115, under control of controller / processor 280 executes SL extension logic 902 stored in memory 282. Functionality enabled by the execution environment of the SL extension logic 902 allows the UE 115 to perform active time period extension operations in accordance with the various aspects herein.

[0105] In embodiments, extending the active time period of the DRX cycle includes one of starting an inactivity timer associated with the DRX cycle at an end of receiving the SCI in the PSCCH from the second UE and restarting the inactivity timer associated with the DRX cycle at the end of receiving the SCI in the PSCCH from the second UE.

[0106] In embodiments, the first UE can receive a DCI message from the base station during the extended active time period of the DRX cycle. In these embodiments, the DCI is received by the first UE after receiving the SCI in the PSCCH from the second UE.

[0107] Figure 7 is a block diagram illustrating example blocks executed to implement one aspect of the present disclosure. The example blocks are also described with respect to the UE 115 shown in Figure 9 shown in FIG. 15. It should be noted that these aspects can be implemented in one or more of the following examples. Figure 7 The description of the example blocks of FIG. 16 is from the perspective of a first UE, which in this discussion can refer to a UE (e.g., UE 115x described above) that is in communication with a second UE (e.g., UE 115y described above) that is operating in DRX with a SL in Mode 1. In embodiments, a base station (e.g., base station 105z) can serve one or both of the first UE and the second UE.

[0108] At block 700, the first UE in communication with a second UE on a SL receives a transmission grant from a base station serving the first UE and the second UE. For example, the first UE (e.g., UE 115) in communication with the base station over a link can receive the transmission grant via antennas 252a-r and wireless radios 901a-r.

[0109] In embodiments, the transmission grant received from the base station can be received in response to the first UE sending a request for a transmission grant to the base station. In embodiments, the transmission grant request can include an indication of the first UE that indicates the second UE is a target receiver of a SL transmission by the first UE. In some embodiments, the first UE can not include the indication, and instead the base station can determine the second UE is a target receiver of a SL transmission by the first UE based on a BSR associated with the first UE.

[0110] In embodiments, the transmission grant can include an indication that the SCI transmission and the subsequent data transmission are to be on a SL from the first UE to the second UE, and that the second UE is an intended target of the SL transmission. In embodiments, the indication that the subsequent data transmission on the SL is intended for the second UE is included in a DCI message sent from the base station to the first UE.

[0111] In embodiments, the transmission grant can include a configuration for transmitting the SCI in a PSCCH to the second UE on the SL. In embodiments, the configuration can include specifying which SL resources the first UE is to use to transmit the SCI, and in some embodiments, the subsequent data transmission.

[0112] In some embodiments, the second UE receives the WUS from the base station prior to receiving the SCI in the PSCCH from the first UE. Based on receiving the WUS, the second UE can be activated to receive during an active time. In embodiments, activating the second UE to receive can include the second UE monitoring the SL between the first UE and the second UE for a transmission of the SCI from the first UE in response to receiving the WUS from the base station. In embodiments, the WUS is transmitted from the base station to the second UE in response to the base station granting the transmission grant to the first UE.

[0113] At block 701, the first UE transmits SCI in a PSCCH by the first UE to a second UE. For example, a first UE (e.g., UE 115) in communication with a second UE on a SL can transmit the SCI in a PSCCH via antennas 252a-r and wireless radios 901a-r. In embodiments, the second UE can be operating in a DRX mode (e.g., DRX mode 1), and the SCI in the PSCCH can be received by the second UE during an active period of a DRX cycle of the second UE. In embodiments, the SCI can include a configuration for a subsequent data transmission from the first UE to the second UE on the SL.

[0114] In some embodiments, transmitting the SCI in the PSCCH to the second UE causes the second UE to extend an active period of a DRX cycle of the second UE receiving the SCI in the PSCCH when the PSCCH indicates the subsequent data transmission is from the first UE to the second UE on the SL.

[0115] In embodiments, the active time period of the extended DRX cycle comprises one of: starting an inactivity timer associated with the DRX cycle at an end of receiving the SCI in the PSCCH from the first UE, and restarting the inactivity timer associated with the DRX cycle at the end of receiving the SCI in the PSCCH from the first UE.

[0116] It should be noted Figure 6 The description of the example blocks of FIG. 13 is from the perspective of a first UE, which can refer to a UE (e.g., UE 115y) operating in DRX with SL in Mode 1. In this example, the first UE can be in SL communication with a second UE (e.g., UE 115x). In embodiments, a base station (e.g., base station 105z) can serve one or both of the first UE and the second UE.

[0117] Figure 8 FIG. 14 is a block diagram illustrating example blocks implemented to perform a method for wireless communication, in accordance with one aspect of the disclosure. The example blocks are also described with respect to a base station 105 as illustrated in Figure 10 FIG. 15, in accordance with one aspect of the disclosure. The example blocks are also described with respect to a base station 105 as illustrated in Figure 8 FIG. 16 is a block diagram illustrating a base station 105 configured to perform a method for wireless communication, in accordance with one aspect of the disclosure. The base station 105 includes structures, hardware, and components as illustrated in Figure 2 with respect to a base station 105 as illustrated in FIG. 15. For example, the base station 105 includes a controller / processor 240 that operates to execute logic or computer instructions stored in memory 242 and that controls the components of the base station 105 to provide the features and functionality of the base station 105. Under the control of controller / processor 240, the base station 105 sends and receives signals via wireless radios 1001a-t and antennas 234a-t. The wireless radios 1001a-t include structures, hardware, and components as illustrated in Figure 2 with respect to a base station 105 as illustrated in FIG. 15, including modulators / demodulators 232a-t, MIMO detector 236, receive processor 238, transmit processor 220, and TX MIMO processor 230.

[0118] It should be noted Figure 8 The description of the example blocks of FIG. 13 is from the perspective of a first UE, which can refer to a UE (e.g., UE 115y) operating in DRX with SL in Mode 1. In this example, the first UE can be in SL communication with a second UE (e.g., UE 115x). In embodiments, a base station (e.g., base station 105z) can serve one or both of the first UE and the second UE.

[0119] At block 800, a base station serving the first UE and the second UE transmits a transmission grant to the first UE. To implement functionality for such operations, the base station 105, under control of the controller / processor 240 executes transmitting logic 1002 stored in the memory 242. Functionality enabled by the execution environment of the transmitting logic 1002 allows the base station 105 to perform transmission grant transmitting operations in accordance with various aspects herein. In embodiments, the first UE can communicate with the second UE on a SL, and the second UE can operate in a DRX mode.

[0120] In embodiments, the transmission grant can be transmitted in a DCI to the first UE, and can be transmitted in response to receiving a request for a transmission grant from the first UE. In embodiments, the transmission grant request can include an indication of the first UE that indicates the second UE is a target receiver of a SL transmission by the first UE. In some embodiments, the first UE can not include the indication, and instead the base station can determine the second UE is a target receiver of a SL transmission by the first UE based on a BSR associated with the first UE.

[0121] In embodiments, the transmission grant can include an indication that a SCI transmission and a subsequent data transmission are to be on a SL from the first UE to the second UE, and that the second UE is an intended target of the SL transmission. In embodiments, the indication that the subsequent data transmission on the SL is intended for the second UE is included in a DCI message transmitted from the base station to the first UE.

[0122] In embodiments, the transmission grant can include a configuration for transmitting a SCI from the first UE to the second UE in a PSCCH on a SL. In embodiments, the configuration can include specifying which SL resources the first UE is to use to transmit the SCI, and in some embodiments, a subsequent data transmission.

[0123] In some embodiments, transmitting the transmission grant to the first UE can cause the first UE to transmit a SCI in a PSCCH to the second UE via a SL between the first UE and the second UE. In embodiments, the SCI in the PSCCH can be transmitted by the first UE and / or received by the second UE during an active period of a DRX cycle of the second UE.

[0124] In embodiments, the base station can transmit a WUS to the second UE in response to transmitting the transmission grant to the first UE. The WUS can be transmitted to ensure the second UE is “awake” to monitor for the SCI transmission from the first UE during a next active period of the DRX cycle. In some embodiments, the base station can transmit the WUS to the second UE prior to the first UE transmitting the SCI to the second UE in a PSCCH.

[0125] In embodiments, receiving the SCI in the PSCCH from the first UE causes the second UE to extend an active time period of a DRX cycle of the second UE that receives the SCI in the PSCCH when the PSCCH indicates a subsequent data transmission from the first UE to the second UE on the sidelink.

[0126] In embodiments, causing the second UE to extend the active time period of the DRX cycle includes one of causing the second UE to start an inactivity timer associated with the DRX cycle at an end of receiving the SCI in the PSCCH from the first UE and causing the second UE to restart the inactivity timer associated with the DRX cycle at the end of receiving the SCI in the PSCCH from the first UE.

[0127] In embodiments, the base station can transmit a DCI message to the second UE during the extended active time period of the DRX cycle. In these embodiments, the DCI transmitted to the first UE can be after receiving the SCI in the PSCCH from the second UE.

[0128] Figure 11 is a diagram illustrating an example implementation of SL-enabled DRX in Mode-2 procedures to implement one aspect of the disclosure. As Figure 11 shown, base station 105z can engage in DRX communication with UE 115y on link 351. As described above, the DRX communication between base station 105z and UE 115y can be configured with a Uu DRX configuration as described above. Meanwhile, UE 115y can also engage in DRX communication with UE 115x on SL 350. In this case, the DRX communication between UE 115x and UE 115y can be configured with a SL DRX configuration. As can be seen, UE 115y can be configured with two kinds of DRX configurations (e.g., Uu DRX configuration and SL DRX configuration) using different DRX timers. In this sense, UE 115y can be configured to implement DRX communication with both a base station and a SL UE simultaneously as described above, thereby enabling UE 115y to take advantage of the benefits of DRX communication (e.g., power saving) while implementing SL communication schemes.

[0129] As Figure 11As shown, the Uu DRX configuration for DRX communication between UE 115y and base station 105z can include one or more Uu DRX cycles (e.g., 1150-1152). The Uu DRX cycle of UE 115y can include an active period and an inactive period. For example, Uu DRX cycles 1150-1152 can include active periods 1100-1102, respectively. In these aspects, UE 115y can monitor for control information from base station 105z during active periods 1100-1102. In these aspects, UE 115y can monitor for DCI during the active periods, but can not monitor for DCI outside of the active periods (e.g., during inactive periods). When a DCI transmission (e.g., in a PDCCH) is detected or received by UE 115y during an active period, the active period in which the DCI is received can be extended. In this sense, the active periods of the Uu DRX cycle of UE 115y can be a function of events in the link between base station 105z and UE 115y.

[0130] As further shown in Figure 11 As further shown in

[0131] In aspects, extending the active period of a Uu DRX cycle and / or a SL DRX cycle can include starting and / or restarting an inactivity timer associated with the respective DRX cycle in which the control information (DCI or SCI) is received. For example, as further shown in Figure 11As shown, in response to UE 115y receiving DCI transmissions on PDCCH 1130 during the active period 1101 of Uu DRX cycle 1151, the active period 1101 can be extended by an extension period 1120 after the end of PDCCH reception. In this example, in response to UE 115y receiving SCI transmissions on PSCCH in SL resource 1160c during the active period 1181 of SL DRX cycle 1171, the active period 1181 can be extended by an extension period 1121 after the end of PSCCH reception.

[0132] In some embodiments, WUS can be sent from base station 105z to UE 115y before the transmission of PDCCH 530 to ensure that UE 115y is monitoring PDCCH 1130 during the active period 1101. As described above, in response to receiving a PDCCH transmission (e.g., a DCI transmission on PDCCH 1130), UE 115y can extend the active period 1101 by an extension period 1120 when the DCI in PDCCH 1130 indicates that subsequent data transmission will be sent from base station 105z to UE 115y. In embodiments, subsequent data transmission can be received by UE 115y during the extended active period.

[0133] In this embodiment, UE 115y can be configured to provide SL DRX configuration, including resources and timers, to other UEs such as UE 115x. Providing SL DRX configuration to other UEs may include sending messages from the DRX UE to other UEs (e.g., SCI messages on the SL link).

[0134] Also Figure 11 As shown, SL resources 1160a-f can occur during DRX cycles 1170-1172. As described above, SL transmissions between UEs 115x and 115y can be confined or limited to these SL resources 1160a-f. Therefore, UE 115x can use any of the SL resources 1160a-f for transmission. For example, UE 115x may expect to send data to UE 115y on SL 350. In this case, UE 115x can schedule SCI transmissions to UE 115y on one of the SL resources 1160a-f.

[0135] In embodiments, UE 115y can monitor for SCI transmissions from UE 115x during active periods 1180-1182. In some embodiments, UE 115y can only monitor for SCI transmissions during the duration of SL resources that overlap with the active periods. For example, active period 1180 overlaps with SL resources 1160a. In this case, UE 115y can only monitor for SCI transmissions during the duration of SL resources 1160a and can not monitor for SCI transmissions during portions of active period 1180 that do not overlap with SL resources 1160a. In other embodiments, UE 115y can monitor during the entire active period 1180. In another example, UE 115y can not monitor for or can abandon monitoring for SCI transmissions during SL resources 1160b because SL resources 1160b do not overlap with the active periods.

[0136] In Figure 11 In the example shown, UE 115x can transmit control information (e.g., SCI) to UE 115y on SL 350 in SL resources 1160c. In embodiments, the SCI can include an indication of which resources UE 115x will use to transmit a subsequent data transmission (e.g., on a PSSCH) as well as other transmission parameters.

[0137] In implementations, after transmitting the SCI to UE 115y on SL 350 in SL resources 1160c during active period 1171, UE 115x can transmit a subsequent data transmission on a PSSCH using the resources specified in the SCI. In some cases, UE 115y can provide feedback (e.g., on a PSFCH) after receiving the PSSCH transmission.

[0138] In embodiments, in response to receiving the SCI transmission in PSCCH in SL resources 1160c during active period 1181, UE 115y can extend active period 1181 by extension period 1121 when the SCI in PSCCH indicates that a subsequent data transmission is to be transmitted from UE 115x to UE 115y. In embodiments, active period 1181 can be extended by starting and / or restarting an inactivity timer associated with SL DRX cycle 1171.

[0139] Figure 12 is a block diagram illustrating example blocks executed to implement one aspect of the present disclosure. The example blocks will also be described with respect to UE 115 as shown in Figure 9

[0140] It should be noted that Figure 12 ​The description of the example blocks is from the perspective of a first UE, which can refer to a UE operating in DRX in mode 2 in SL (e.g., UE 115y described above). In this example, the first UE can be in SL communication with a second UE (e.g., UE 115x). In embodiments, a base station (e.g., base station 105z) can serve one or both of the first UE and the second UE.

[0141] At block 1200, the first UE in SL communication with the second UE transmits a SL DRX configuration to the second UE. To enable functionality for such operations, the UE 115 executes, under control of controller / processor 280, transmitting logic 902 stored in memory 282. Functionality enabled by the execution environment of the transmitting logic 902 allows the UE 115 to perform SL DRX configuration transmission operations in accordance with various aspects herein. In embodiments, the SL DRX configuration can specify a SL DRX pattern of the first UE with respect to the SL. The SL DRX pattern of the first UE can include at least one SL DRX cycle having an active period for reception on the SL and an inactive period for reception on the SL. During the active period, the first UE can monitor for transmissions (e.g., SCI transmissions) from the second UE. During the inactive period, the first UE can not monitor for transmissions (e.g., SCI transmissions) from the second UE.

[0142] In embodiments, the configuration of the SL between the first UE and the second UE can include at least one SL resource. In these embodiments, transmissions on the SL between the first UE and the second UE can be limited to the at least one SL resource. In embodiments, the communication on the SL between the first UE and the second UE is performed without requesting a transmission grant from a base station.

[0143] In embodiments, the first UE can be further configured for a Uu DRX pattern with respect to communication with a base station. In embodiments, the Uu DRX pattern of the first UE can include at least one Uu DRX cycle having an active period for reception on a link between the first UE and the base station and an inactive period for reception on the link. During the active period, the first UE can monitor for transmissions (e.g., DCI transmissions) from the base station. During the inactive period, the first UE can not monitor for transmissions (e.g., DCI transmissions) from the base station.

[0144] At block 1201, the first UE receives, from a second UE, SCI in a PSCCH on a SL. For example, a first UE (e.g., UE 115) in communication with a second UE on a SL can receive the SCI via antennas 252a-r and wireless radios 901a-r. In embodiments, the SCI in the PSCCH can be received by the first UE during an active time period of a SL DRX cycle of the first UE. In embodiments, receiving the SCI in the PSCCH from the second UE can include monitoring, by the first UE, a SL resource associated with the first UE for a transmission of the SCI from the second UE. In embodiments, the monitored SL resource can overlap with the active time period of the SL DRX cycle of the first UE.

[0145] At block 1202, the first UE, in response to receiving the SCI in the PSCCH from the second UE, extends an active time period of at least one SL DRX cycle in which the SCI in the PSCCH is received from the second UE when the SCI in the PSCCH indicates a subsequent data transmission on the SL from the second UE to the first UE. To implement functionality for such operations, UE 115 executes SL extension logic 902 stored in memory 282 under control of controller / processor 280. The functionality enabled by the execution environment of SL extension logic 902 allows UE 115 to perform active time period extension operations in accordance with various aspects herein.

[0146] In embodiments, extending the active time period of the SL DRX cycle includes one of starting an inactivity timer associated with the SL DRX cycle at an end of receiving the SCI in the PSCCH from the second UE and restarting the inactivity timer associated with the SL DRX cycle at the end of receiving the SCI in the PSCCH from the second UE.

[0147] Figure 13 is a block diagram illustrating example blocks executed to implement one aspect of the present disclosure. The example blocks of Figure 9 will be described with reference to the UE 115 illustrated in FIG. 1. It should be noted Figure 13 The description of the example blocks of FIG. 12 will be presented with reference to a UE (e.g., UE 115x) in communication with a second UE (e.g., UE 115y) operating in DRX with SL in mode 2. In embodiments, a base station (e.g., base station 105z) can serve one or both of the first UE and the second UE.

[0148] At block 1300, the first UE in communication with the second UE on a SL receives, from the second UE, a SL DRX configuration. For example, the first UE (e.g., UE 115) in communication with the second UE on a SL can receive the SL DRX configuration via antennas 252a-r and wireless radios 901a-r. In embodiments, the SL DRX configuration can specify a SL DRX pattern of the second UE with respect to the SL. The SL DRX pattern of the second UE can include at least one SL DRX cycle having an active period for reception on the SL and an inactive period for reception on the SL. During the active period, the second UE can monitor for transmissions (e.g., SCI transmissions) from the second UE. During the inactive period, the second UE can not monitor for transmissions (e.g., SCI transmissions) from the second UE.

[0149] In embodiments, the configuration of the SL between the first UE and the second UE can include at least one SL resource. In these embodiments, transmissions on the SL between the first UE and the second UE can be limited to the at least one SL resource. In embodiments, the communication on the SL between the first UE and the second UE is performed without requesting a transmission grant from a base station.

[0150] In embodiments, the second UE can be further configured for a Uu DRX pattern with respect to communications with a base station. In embodiments, the Uu DRX pattern of the second UE can include at least one Uu DRX cycle having an active period for reception on a link between the second UE and the base station and an inactive period for reception on the link. During the active period, the second UE can monitor for transmissions (e.g., DCI transmissions) from the base station. During the inactive period, the second UE can not monitor for transmissions (e.g., DCI transmissions) from the base station.

[0151] At block 1301, the first UE transmits, to the second UE, SCI in a PSCCH. In embodiments, the SCI in the PSCCH can be received by the second UE during an active period of at least one SL DRX cycle of the second UE. To implement functionality for such operations, UE 115 executes, under control of controller / processor 280, transmitting logic 902 stored in memory 282. The functionality enabled by the execution environment of transmitting logic 902 allows UE 115 to perform SCI transmitting operations in accordance with the various aspects herein.

[0152] In an embodiment, transmitting the SCI in the PSCCH to the second UE includes transmitting the SCI in the PSCCH in a SL resource of the SL between the first UE and the second UE that overlaps an active period of at least one SL DRX cycle of the second UE. In some embodiments, the SL resource for transmission of the SCI from the first UE is monitored by the second UE.

[0153] At block 1302, the first UE causes the second UE to extend an active period of at least one SL DRX cycle in which the PSCCH with the SCI is received from the first UE in response to receiving the SCI in the PSCCH from the first UE when the SCI in the PSCCH indicates a subsequent data transmission from the first UE to the second UE over the SL.

[0154] In an embodiment, causing the second UE to extend the active period of the SL DRX cycle includes one of causing the second UE to start an inactivity timer associated with the SL DRX cycle at an end of receiving the SCI in the PSCCH from the first UE and causing the second UE to restart the inactivity timer associated with the SL DRX cycle at the end of receiving the SCI in the PSCCH from the first UE.

[0155] Those skilled in the art will understand that information and signals can be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that can be referenced throughout the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0156] The components, blocks, and modules described herein (e.g., the components, blocks, and modules in Figure 2 may include processors, electronic devices, hardware devices, electronic components, logical circuits, memories, software codes, firmware codes, etc., or any combination thereof. Moreover, features discussed herein can be implemented via special-purpose processor circuitry, via executable instructions, and / or via a combination of both.

[0157] Those skilled in the art will further recognize the individual steps of the various illustrative logical blocks, modules, circuits, and algorithm steps (e.g., the steps of the methods described in Figures 6 to 8The various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality, although many times implementation of the illustrated examples are operable to implement various examples. Whether such functionality is implemented in hardware or software depends on the particular application and design constraints imposed on the overall system. Skilled artisans can implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure. In some embodiments, the various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality without limitation to the specific examples described. Such description should be taken merely as illustrative of broad functional capabilities, and it would be understood by those skilled in the art that the various illustrative components, blocks, modules, circuits, and steps could be implemented in other ways to achieve similar broad functional results without departing from the scope of the present disclosure.

[0158] Various illustrative logical blocks, modules, and circuits described in connection with the disclosure herein can be implemented or performed with a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (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 can be a microprocessor, but in the alternative, the processor can be any conventional processor, controller, microcontroller, or state machine. A processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0159] The steps of a method or algorithm described in connection with the disclosure herein can be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium can be integral to the processor. The processor and the storage medium can reside in an ASIC. The ASIC can reside in a user terminal. In the alternative, the processor and the storage medium can reside as discrete components in a user terminal.

[0160] In one or more exemplary designs, the functions described can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions can be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. Computer-readable storage media can be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, functional computer-readable media

[0161] As used herein, including in the claims (to the extent the term is used therein), the term "and / or," when used in a list of two or more items, means that any one of the listed items can be employed by itself, or any combination of two or more of the listed items can be employed. For example, if a composition is described as containing components A, B, and / or C, the composition can contain A alone; B alone; C alone; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination. Also, as used herein, including in the claims (to the extent the term is used therein), the term "or" as used in the "at least one of A or B" connotes the set of alternatives A or B or both A and B, i.e., A or B or AB (A and B). Also, as used herein, including in the claims (to the extent the term is used therein), the terminology or reference "a number of" means one or more than one, i.e., one or a plurality.

[0162] The foregoing description of the present disclosure has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure to the precise form disclosed. Many modifications and variations are possible in light of the above teaching. It is intended that the scope of the disclosure be limited not with the examples described herein, but rather by the claims appended hereto.

Claims

1. A method of wireless communication, comprising: receiving, by a first user equipment (UE) that is in communication with a base station and in communication with a second UE on a sidelink, a wake-up signal (WUS) from the base station, wherein the first UE is operating in a discontinuous reception (DRX) mode, and wherein the WUS is received by the first UE during an inactive period of a DRX cycle of the first UE; receiving, by the first UE in association with receiving the WUS from the base station, sidelink control information from the second UE in a physical sidelink control channel (PSCCH), wherein the PSCCH is received by the first UE during an active period of the DRX cycle of the first UE; and in response to receiving the sidelink control information from the second UE in the PSCCH, extending the active period of the DRX cycle in which the sidelink control information is received from the second UE in the PSCCH when the PSCCH indicates a subsequent data transmission on the sidelink from the second UE to the first UE.

2. The method of claim 1, wherein, extending the active period of the DRX cycle comprises one of: starting an inactivity timer associated with the DRX cycle at an end of receiving the sidelink control information from the second UE in the PSCCH; and restarting the inactivity timer associated with the DRX cycle at an end of receiving the sidelink control information from the second UE in the PSCCH.

3. The method of claim 1, wherein, the sidelink control information in the PSCCH is transmitted by the second UE to the first UE in response to the second UE receiving a transmission grant from a base station, the transmission grant including a configuration for the subsequent data transmission on the sidelink.

4. The method of claim 3, wherein, the transmission grant transmitted from the base station to the second UE includes an indication that the first UE is intended for the subsequent data transmission on the sidelink.

5. The method of claim 1, further comprising: in response to receiving the WUS from the base station, activating the first UE to receive during the active period of the DRX cycle.

6. The method of claim 5, further comprising: in response to receiving the WUS from the base station, monitoring, by the first UE, the sidelink between the first UE and the second UE for a transmission of the sidelink control information from the second UE.

7. The method of claim 1, wherein, the WUS is transmitted from the base station in response to the base station granting a transmission grant to the second UE, the transmission grant including a configuration for the subsequent data transmission on the sidelink received by the first UE.

8. The method of claim 1, further comprising: receiving, by the first UE from a base station during the extended active period of the DRX cycle, downlink control information (DCI), the DCI received by the first UE after receiving the sidelink control information from the second UE in the PSCCH.

9. The method of claim 1, further comprising: transmitting, to the second UE, a SL DRX configuration that specifies a SL DRX pattern of the first UE with respect to the SL, wherein the SL DRX pattern of the first UE includes at least one SL DRX cycle that has an active period for reception on the SL and an inactive period for reception on the SL.

10. The method of claim 8, wherein, the first UE is further configured for a Uu DRX pattern with respect to communications with the base station, wherein the Uu DRX pattern of the first UE includes at least one Uu DRX cycle that has an active period for reception on a link between the first UE and the base station and an inactive period for reception on the link.

11. An apparatus for wireless communication, comprising: a processing system including one or more processors and one or more memories coupled to the one or more processors, the processing system configured to cause the apparatus to: transmit, by a first user equipment (UE) that communicates with a base station and on a sidelink with a second UE, a request to the base station for a transmission grant for transmissions on the sidelink, wherein transmitting the request to the base station for the transmission grant causes the base station to transmit a wake-up signal (WUS) to the second UE prior to the first UE transmitting sidelink control information (SCI) in a physical sidelink control channel (PSCCH) to the second UE; receive, by the first UE, the transmission grant from the base station that serves the first UE and the second UE; and in response to receiving the transmission grant from the base station, transmit, by the first UE, SCI in the PSCCH to the second UE, wherein the second UE operates in a discontinuous reception (DRX) mode, wherein the SCI in the PSCCH is received by the second UE during an active period of a DRX cycle of the second UE, the SCI including a configuration for a subsequent data transmission on the sidelink from the first UE to the second UE, wherein transmitting the SCI in the PSCCH to the second UE causes the second UE to extend the active period of the DRX cycle of the second UE in which the SCI in the PSCCH is received when the PSCCH indicates the subsequent data transmission on the sidelink from the first UE to the second UE.

12. The apparatus of claim 11, wherein, causing the second UE to extend the active period of the DRX cycle includes one of: causing the second UE to start an inactivity timer associated with the DRX cycle upon an end of receiving the sidelink control information in the PSCCH from the first UE; and causing the second UE to restart the inactivity timer associated with the DRX cycle upon an end of receiving the sidelink control information in the PSCCH from the first UE.

13. The apparatus of claim 11, wherein, The transmission grant received by the first UE includes an indication that the subsequent data transmission is intended for the second UE.

14. The apparatus of claim 11, wherein, The request for the transmission grant includes an indication that the subsequent data transmission is intended for the second UE.

15. The apparatus of claim 11, wherein, The WUS is transmitted to the second UE at a time when the transmission grant is granted by the base station.

16. The apparatus of claim 11, wherein, The WUS is configured to activate the second UE to receive during the active period of the DRX cycle in response to receiving the WUS from the base station.

17. The apparatus of claim 16, wherein, Causing the base station to transmit the WUS to the second UE causes the second UE to monitor the sidelink between the first UE and the second UE for transmission of the SCI from the first UE in response to receiving the WUS from the base station.

18. A method of wireless communication, comprising: transmitting, by a first user equipment (UE) in communication with a base station and a second UE on a sidelink (SL), a request for a transmission grant for a transmission on the sidelink to the base station, wherein transmitting the request for the transmission grant to the base station causes the base station to transmit a wake-up signal (WUS) to the second UE prior to the first UE transmitting SL control information (SCI) to the second UE in a physical SL control channel (PSCCH); receiving, by the first UE, the transmission grant from the base station serving the first UE and the second UE; transmitting, by the first UE, SCI to the second UE in the PSCCH in response to receiving the transmission grant from the base station, wherein the SCI in the PSCCH is received by the second UE during an active period of at least one SL discontinuous reception (DRX) cycle of the second UE, wherein transmitting the SCI to the second UE in the PSCCH causes the second UE to: in response to receiving the SCI from the first UE in the PSCCH, extend the active period of the at least one SL DRX cycle of the second UE in which the SCI is received from the first UE in the PSCCH when the SCI in the PSCCH indicates a subsequent data transmission on the SL from the first UE to the second UE.

19. The method of claim 18, further comprising: transmitting, to the second UE, a SL DRX configuration that specifies a SL DRX pattern of the second UE with respect to the SL, wherein the SL DRX pattern of the second UE includes at least one SL DRX cycle having an active period for reception on the SL and an inactive period for reception on the SL.

20. The method of claim 18, wherein, the first UE is further configured for a Uu DRX pattern with respect to communication with a base station, wherein the Uu DRX pattern of the first UE includes at least one Uu DRX cycle having an active period for reception on a link between the first UE and the base station and an inactive period for reception on the link.

21. An apparatus for wireless communication, comprising: a processing system including one or more processors and one or more memories coupled to the one or more processors, the processing system configured to cause the apparatus to: transmit, by a base station serving a first user equipment (UE) and a second UE, a transmission grant to the first UE, the first UE communicating with the second UE on a sidelink, the second UE operating in a discontinuous reception (DRX) mode, transmit, by the base station in response to transmitting the transmission grant to the first UE, a wake-up signal (WUS) to the second UE, the WUS being transmitted to the second UE prior to the first UE transmitting sidelink control information (SCI) to the second UE in a physical sidelink control channel (PSCCH), wherein the transmission grant causes the first UE to transmit the SCI to the second UE in the PSCCH, the SCI including a configuration for a subsequent data transmission from the first UE to the second UE on the sidelink, wherein the SCI in the PSCCH is received by the second UE during an active period of a DRX cycle of the second UE in association with receiving the WUS from the base station, and wherein receiving the SCI from the first UE in the PSCCH causes the second UE to extend the active period of the DRX cycle of the second UE in which the SCI in the PSCCH is received when the PSCCH indicates the subsequent data transmission from the first UE to the second UE on the sidelink.

22. The apparatus of claim 21, wherein, causing the second UE to extend the active period of the DRX cycle includes one of: causing the second UE to start an inactivity timer associated with the DRX cycle at an end of receiving the SCI in the PSCCH from the first UE; and causing the second UE to restart the inactivity timer associated with the DRX cycle at the end of receiving the SCI in the PSCCH from the first UE.

23. The apparatus of claim 21, wherein, the transmission grant includes an indication that the subsequent data transmission on the sidelink is intended for the second UE.

24. The apparatus of claim 21, wherein, the processing system is further configured to cause the apparatus to: receive, by the base station from the first UE, a request for the transmission grant, wherein the request for the transmission grant includes an indication that the subsequent data transmission is intended for the second UE.

25. The apparatus of claim 21, wherein, the processing system is further configured to cause the apparatus to: determine, by the base station based on a buffer status report (BSR), that the subsequent data transmission is intended for the second UE.

26. The apparatus of claim 22, wherein, the WUS is configured to activate the second UE to receive during the active period of the DRX cycle in response to receiving the WUS from the base station.

27. The apparatus of claim 22, wherein, Transmitting the WUS to the second UE causes the second UE to monitor the sidelink between the first UE and the second UE for transmission of the SCI from the first UE in response to receiving the WUS from the base station.

28. The apparatus of claim 21, wherein, The processing system is further configured to cause the apparatus to: transmit, by the base station, a downlink control information (DCI) to the second UE during an extended active period of the DRX cycle, the DCI being transmitted to the second UE after the second UE receives the SCI from the first UE in the PSCCH.

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