CN116250370A - Discontinuous Reception (DRX) using side-links (SL) - Google Patents

Abstract

Systems and methods for configuring and providing Discontinuous Reception (DRX) operation in side-link (SL) mode 1 and mode 2 are disclosed. A first User Equipment (UE) may operate in DRX communication with a second UE on SL while maintaining DRX communication with a base station. In some embodiments, the DRX operation may include the first UE monitoring one or both of transmissions in the 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 may 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

Discontinuous Reception (DRX) using side-links (SL)

Cross Reference to Related Applications

The present application claims the benefit of U.S. patent application Ser. No. 17/448,665 (208632) entitled "DISCONTINUOUS RECEPTION (DRX) WITH SIDELINK (SL)" filed on month 9 of 2021, and U.S. provisional patent application Ser. No. 63/083,053 (208632P 1) entitled "DISCONTINUOUS RECEPTION (DRX) WITH SIDELINK (SL) IN MODE 1" filed on month 9 of 2020 and U.S. provisional patent application Ser. No. 63/083,056 (208633P 1) entitled "DISCONTINUOUS RECEPTION (DRX) WITH SIDELINK (SL) IN MODE 2" filed on month 9 of 2020, the disclosures of which are hereby incorporated by reference IN their entireties as if fully set forth herein below for all applicable purposes.

Technical Field

Aspects of the present disclosure relate generally to wireless communication systems and, more particularly, to Discontinuous Reception (DRX) communication. Some embodiments of the techniques discussed below may enable and provide side-link (SL) DRX communication in SL mode 1 and/or mode 2.

Background

Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, information delivery, broadcast, and so on. These wireless networks may be multiple-access networks capable of supporting multiple users by sharing the available network resources. Such networks, typically multiple access networks, support communication for multiple users by sharing the available network resources.

A wireless communication network may include many base stations or node bs that may support communication for many User Equipment (UEs). The UE may communicate with the base station via the downlink and uplink. The downlink (or forward link) refers to the communication link from the base stations to the UEs, and the uplink (or reverse link) refers to the communication link from the UEs to the base stations.

The base station may transmit data and control information to the UE on the downlink and/or may receive data and control information from the UE on the uplink. On the downlink, transmissions from a base station may experience interference due to transmissions from neighboring base stations or from other Radio Frequency (RF) transmitters. On the uplink, transmissions from a UE may experience interference from other UEs communicating with neighboring base stations or uplink transmissions from other wireless RF transmitters. Such interference may degrade performance on the downlink and uplink.

With the increasing demand for mobile broadband access, the likelihood of interference and congested networks increases as more and more UEs access long-range wireless communication networks and more short-range wireless systems are deployed in communities. Research and development is continually advancing the development of wireless technology not only to meet the increasing demand for mobile broadband access, but also to advance and enhance the user experience of mobile communications.

Disclosure of Invention

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

In one aspect of the disclosure, a method of wireless communication includes receiving, by a first UE communicating with a second UE over 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 period of the first UE's DRX cycle. The method further comprises the steps of: in response to receiving SL control information from the second UE in the PSCCH, an active period of a DRX cycle in which the SL control information is received from the second UE in the PSCCH is extended when the PSCCH indicates a subsequent data transmission on SL from the second UE to the first UE.

In an additional aspect of the disclosure, a method of wireless communication includes receiving, by a first UE in communication with a second UE over SL, a transmission grant from a base station serving the first UE and the second UE, and transmitting, by the first UE, the SCI in a PSCCH to the second UE. In an embodiment, the second UE operates in DRX mode and SCI in the PSCCH is received by the second UE during an active period of the second UE's DRX cycle. In an embodiment, the SCI includes a configuration for subsequent data transmission from the first UE to the second UE over the SL. In an embodiment, the SCI in the PSCCH is transmitted to the second UE such that the second UE extends an active 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.

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 communicating with the second UE over SL. In an embodiment, the second UE operates in DRX mode and the transmission grant causes the first UE to send an SCI to the second UE in the PSCCH, the SCI including a configuration for subsequent data transmissions from the first UE to the second UE on the SL. In an embodiment, the SCI in the PSCCH is received by the second UE during an active period of the 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 period of the 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.

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 over a SL, a 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 period of the first UE's DRX cycle. The apparatus further comprises: in response to receiving SL control information from the second UE in the PSCCH, extending an active period of a 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 on SL from the second UE to the first UE.

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 over 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, the SCI in a PSCCH to the second UE. In an embodiment, the second UE operates in DRX mode and SCI in the PSCCH is received by the second UE during an active period of the second UE's DRX cycle. In an embodiment, the SCI includes a configuration for subsequent data transmission from the first UE to the second UE over the SL. In an embodiment, the SCI in the PSCCH is transmitted to the second UE such that the second UE extends an active 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.

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 communicating with the second UE over SL. In an embodiment, the second UE operates in DRX mode and the transmission grant causes the first UE to send an SCI to the second UE in the PSCCH, the SCI including a configuration for subsequent data transmissions from the first UE to the second UE on the SL. In an embodiment, the SCI in the PSCCH is received by the second UE during an active period of the 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 period of the 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.

In an additional aspect of the disclosure, a non-transitory computer readable medium has program code recorded thereon. The program code also includes code for receiving, by a first UE in communication with a second UE over SL, the SCI in the 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 period of the first UE's DRX cycle. The program code further includes: in response to receiving SL control information from the second UE in the PSCCH, extending an active period of a 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 on SL from the second UE to the first UE.

In an additional aspect of the disclosure, a non-transitory computer readable medium has program code recorded thereon. The program code also includes code for receiving, by a first UE in communication with a second UE over SL, a transmission grant from a base station serving the first UE and the second UE and transmitting, by the first UE, the SCI to the second UE in the PSCCH. In an embodiment, the second UE operates in DRX mode and SCI in the PSCCH is received by the second UE during an active period of the second UE's DRX cycle. In an embodiment, the SCI includes a configuration for subsequent data transmission from the first UE to the second UE over the SL. In an embodiment, the SCI in the PSCCH is transmitted to the second UE such that the second UE extends an active 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.

In an additional aspect of the disclosure, a non-transitory computer readable medium has program code recorded thereon. The program code also includes code for transmitting, by a base station serving the first UE and the second UE, a transmission grant to the first UE, the first UE communicating with the second UE over SL. In an embodiment, the second UE operates in DRX mode and the transmission grant causes the first UE to send an SCI to the second UE in the PSCCH, the SCI including a configuration for subsequent data transmissions from the first UE to the second UE on the SL. In an embodiment, the SCI in the PSCCH is received by the second UE during an active period of the 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 period of the 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.

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 SL, a 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 period of the first UE's DRX cycle. The processor is further configured to: in response to receiving SL control information from the second UE in the PSCCH, an active period of a DRX cycle in which the SL control information is received from the second UE in the PSCCH is extended when the PSCCH indicates a subsequent data transmission on SL from the second UE to the first UE.

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 SL, a transmission grant from a base station serving the first UE and the second UE and to transmit, by the first UE, the SCI to the second UE in the PSCCH. In an embodiment, the second UE operates in DRX mode and SCI in the PSCCH is received by the second UE during an active period of the second UE's DRX cycle. In an embodiment, the SCI includes a configuration for subsequent data transmission from the first UE to the second UE over the SL. In an embodiment, the SCI in the PSCCH is transmitted to the second UE such that the second UE extends an active 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.

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 base station serving a first UE and a second UE, a transmission grant to the first UE, the first UE communicating with the second UE over SL. In an embodiment, the second UE operates in DRX mode and the transmission grant causes the first UE to send an SCI to the second UE in the PSCCH, the SCI including a configuration for subsequent data transmissions from the first UE to the second UE on the SL. In an embodiment, the SCI in the PSCCH is received by the second UE during an active period of the 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 period of the 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.

In an additional aspect of the disclosure, a method of wireless communication includes transmitting, by a first UE in communication with a second UE over SL, a SL DRX configuration specifying a SL DRX mode for the first UE for SL. In an embodiment, the SL DRX mode of the first UE includes at least one SL DRX cycle having an active period for reception on SL and an inactive period for reception on SL. The method also includes receiving, by the first UE, SL Control Information (SCI) from the second UE in a Physical SL Control Channel (PSCCH). In an embodiment, SCI in the PSCCH is received by the first UE during an active period of at least one SL DRX cycle of the first UE. The method further comprises the steps of: in response to receiving the SCI in the PSCCH from the second UE, extending an active 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.

In an additional aspect of the disclosure, a method of wireless communication includes receiving, by a first UE in communication with a second UE over SL, a SL DRX configuration specifying a SL DRX mode for the second UE with respect to SL. In an embodiment, the SL DRX mode of the second UE includes at least one SL DRX cycle having an active period for reception on SL and an inactive period for reception on SL. The method also includes transmitting, by the first UE, the SCI in the PSCCH to the second UE. In an embodiment, the SCI in the PSCCH is received by the second UE during an active period of 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 extend the active period of at least one SL DRX cycle in which the SCI in the PSCCH 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 on SL from the first UE to the second UE.

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 over SL, a SL DRX configuration specifying a SL DRX mode for the first UE for SL. In an embodiment, the SL DRX mode of the first UE includes at least one SL DRX cycle having an active period for reception on SL and an inactive period for reception on SL. The apparatus also includes means for receiving, by the first UE, the SCI in the PSCCH from the second UE. In an embodiment, SCI in the PSCCH is received by the first UE during an active period of at least one SL DRX cycle of the first UE. The apparatus further comprises: in response to receiving the SCI in the PSCCH from the second UE, when the SCI in the PSCCH indicates a subsequent data transmission on SL from the second UE to the first UE, extending an active period extension of at least one SL DRX cycle in which the SCI in the PSCCH is received from the second UE.

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 over SL, a SL DRX configuration specifying a SL DRX mode for the second UE. In an embodiment, the SL DRX mode of the second UE includes at least one SL DRX cycle having an active period for reception on SL and an inactive period for reception on SL. The apparatus also includes means for transmitting, by the first UE, the SCI in the PSCCH to the second UE. In an embodiment, the SCI in the PSCCH is received by the second UE during an active period of 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 extend the active period of at least one SL DRX cycle in which the SCI in the PSCCH 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 on SL from the first UE to the second UE.

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

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 over SL, a SL DRX configuration specifying a SL DRX mode for the second UE with respect to SL. In an embodiment, the SL DRX mode of the second UE includes at least one SL DRX cycle having an active period for reception on SL and an inactive period for reception on SL. The program code also includes code for transmitting, by the first UE, the SCI in the PSCCH to the second UE. In an embodiment, the SCI in the PSCCH is received by the second UE during an active period of 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 extend the active period of at least one SL DRX cycle in which the SCI in the PSCCH 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 on SL from the first UE to the second UE.

In an additional aspect of the disclosure, an apparatus configured for wireless communication is disclosed. The device comprises: 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 over SL, a SL DRX configuration specifying a SL DRX mode for the first UE with respect to SL. In an embodiment, the SL DRX mode of the first UE includes at least one SL DRX cycle having an active period for reception on SL and an inactive period for reception on SL. The processor is further configured to receive, by the first UE, the SCI in the PSCCH from the second UE. In an embodiment, SCI in the PSCCH is received by the first UE during an active period of at least one SL DRX cycle of the first UE. The processor is further configured to: for extending an active 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 in response to receiving the SCI in the PSCCH from the second UE.

In an additional aspect of the disclosure, an apparatus configured for wireless communication is disclosed. The device comprises: 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 SL, a SL DRX configuration specifying a SL DRX mode for the second UE with respect to SL. In an embodiment, the SL DRX mode of the second UE includes at least one SL DRX cycle having an active period for reception on SL and an inactive period for reception on SL. The processor is further configured to transmit, by the first UE, the SCI to the second UE in the PSCCH. In an embodiment, the SCI in the PSCCH is received by the second UE during an active period of 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 extend the active period of at least one SL DRX cycle in which the SCI in the PSCCH 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 on SL from the first UE to the second UE.

Other aspects, features and embodiments will become apparent to those ordinarily skilled in the art upon review of the following description of specific exemplary aspects in conjunction with the accompanying figures. Although features may be discussed with respect to certain aspects and figures below, all aspects may include one or more of the advantageous features discussed herein. In other words, while one or more aspects may be discussed as having certain advantageous features, one or more of such features may also be used in accordance with various aspects. In a similar manner, although exemplary aspects may be discussed below as apparatus, systems, or methods, exemplary aspects may be implemented in a variety of apparatus, systems, and methods.

Drawings

A further understanding of the nature and advantages of the present disclosure may be realized by reference to the following drawings. In the drawings, similar components or features may have the same reference numerals. Furthermore, individual components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If only the first reference label is used in the specification, the description applies to any one of the similar components having the same first reference label, regardless of the second reference label.

Fig. 1 is a block diagram illustrating details of a wireless communication system in accordance with some aspects of the present disclosure.

Fig. 2 is a block diagram conceptually illustrating a design of a base station and a UE configured in accordance with some aspects of the present disclosure.

Fig. 3 is a block diagram illustrating details of an example wireless communication system implementing a side-uplink communication scheme.

Fig. 4 is a diagram illustrating an operation in the DRX mode 1.

Fig. 5 is a diagram illustrating DRX in SL mode 1 operation implemented according to some aspects of the present disclosure.

Fig. 6 is a block diagram illustrating example blocks executed by a user device for implementing aspects of the present disclosure.

Fig. 7 is a block diagram illustrating example blocks executed by a user device for implementing aspects of the present disclosure.

Fig. 8 is a block diagram illustrating example blocks performed by a base station for implementing aspects of the present disclosure.

Fig. 9 is a block diagram conceptually illustrating a design of a user device configured in accordance with some embodiments of the present disclosure.

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

Fig. 11 is a diagram illustrating DRX in SL mode 2 operation implemented according to some aspects of the present disclosure.

Fig. 12 is a block diagram illustrating example blocks executed by a user device for implementing aspects of the present disclosure.

Fig. 13 is a block diagram illustrating example blocks executed by a user device for implementing aspects of the disclosure.

Detailed Description

The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to limit the scope of the present disclosure. Rather, the "detailed description" includes specific details for the purpose of providing a thorough understanding of the present subject matter. It will be apparent to one skilled in the art that these specific details are not required in every case and that, in some instances, well-known structures and components are shown in block diagram form for clarity of presentation.

The present disclosure relates generally to providing or participating in 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 apparatuses may 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, 5 th generation (5G) or New Radio (NR) networks (sometimes referred to as "5G NR" networks/systems/devices), and other communication networks. As described herein, the terms "network" and "system" may be used interchangeably.

CDMA networks may implement radio technologies such as Universal Terrestrial Radio Access (UTRA), CDMA2000, and the like, for example. UTRA includes wideband CDMA (W-CDMA) and Low Chip Rate (LCR). CDMA2000 covers IS-2000, IS-95, and IS-856 standards.

TDMA networks may, for example, implement radio technologies such as global system for mobile communications (GSM). The third generation partnership project (3 GPP) defines standards for the GSM EDGE (enhanced data rates for GSM evolution) Radio Access Network (RAN), also denoted GERAN. GERAN is a radio component of GSM/EDGE along with a network connecting base stations (e.g., the Ater and Abis interfaces) and base station controllers (a interfaces, etc.). The radio access network represents a component of the GSM network through which telephone calls and packet data are routed from the Public Switched Telephone Network (PSTN) and the internet to and from subscriber handsets (also known as user terminals or User Equipment (UE)). The network of the mobile telephone operator may comprise one or more GERANs, which in the case of UMTS/GSM networks may be coupled with a Universal Terrestrial Radio Access Network (UTRAN). Additionally, the operator network may also include one or more LTE networks and/or one or more other networks. Various different network types may use different Radio Access Technologies (RATs) and Radio Access Networks (RANs).

An OFDMA network may implement radio technologies such as evolved UTRA (E-UTRA), IEEE 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM, and the like. UTRA, E-UTRA and global system for mobile communications (GSM) are parts of Universal Mobile Telecommunications 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 provided from an organization named "3 rd generation partnership project" (3 GPP), and cdma2000 is described in documents from an organization named "3 rd generation partnership project 2" (3 GPP 2). These various radio technologies and standards are known or under development. For example, 3GPP is a collaboration between the telecommunications associations community intended to define the globally applicable third generation (3G) mobile phone specifications. The 3GPP Long Term Evolution (LTE) is a 3GPP project aimed at improving the Universal Mobile Telecommunications System (UMTS) mobile telephony standard. The 3GPP may define specifications for next generation mobile networks, mobile systems, and mobile devices. The present disclosure may describe certain aspects with reference to LTE, 4G, or 5G NR technologies; 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 may be understood as 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.

The 5G network contemplates a diverse deployment, a diverse spectrum, and a diverse service and device that can be implemented using an OFDM-based unified air interface. To achieve these goals, further enhancements to LTE and LTE-a are considered in addition to developing new radio technologies for 5G NR networks. The 5G NR will be able to scale to provide coverage for: (1) Large internet of things (IoT) with ultra-high density (e.g., -1M nodes/km 2), ultra-low complexity (e.g., -10 s bits/sec), ultra-low energy (e.g., -10+ years of battery life), and deep coverage with the ability to reach challenging locations; (2) Including mission critical controls with strong security to protect sensitive personal, financial, or classified information, ultra-high reliability (e.g., -99.9999% reliability), ultra-low latency (e.g., -1 millisecond (ms)), and users with a wide range of movement or lack of range of movement; and (3) enhanced mobile broadband, including extremely high capacity (e.g., -10 Tbps/km 2), limited data rates (e.g., multiple Gbps rates, 100+Mbps user experience rates), and advanced discovery and optimized depth awareness.

The 5G NR device, network and system may be implemented to use waveform characteristics based on optimized OFDM. These characteristics may include an extensible parameter set and Transmission Time Interval (TTI); a generic, flexible framework that can effectively multiplex services and features through a dynamic, low-latency Time Division Duplex (TDD)/Frequency Division Duplex (FDD) design; and advanced wireless technologies such as massive Multiple Input Multiple Output (MIMO), robust millimeter wave (mmWave) transmission, advanced channel coding, and device-centric mobility. The expandability of the parameter set in 5G NR can efficiently handle diversified services in diversified spectrum and diversified deployment by adopting expansion of subcarrier spacing. For example, in various outdoor and macro coverage deployments with less than 3GHz FDD/TDD implementations, subcarrier spacing may occur at 15kHz, e.g., over bandwidths of 1, 5, 10, 20MHz, etc. For other various outdoor and small cell coverage deployments of TDD greater than 3GHz, a subcarrier spacing of 30kHz may occur over an 80/100MHz bandwidth. For other various indoor wideband implementations using TDD on the unlicensed portion of the 5GHz band, subcarrier spacing may occur at 60kHz over 160MHz bandwidth. Finally, for various deployments with transmission through mmWave components at 28GHz TDD, subcarrier spacing may occur at 120kHz over 500MHz bandwidth.

The scalable set of parameters for 5G NR contributes to scalable TTI for diverse latency and quality of service (QoS) requirements. For example, shorter TTIs may be used for low latency and high reliability, while longer TTIs may be used for higher spectral efficiency. Efficient multiplexing of long and short TTIs allows transmissions to start on symbol boundaries. The 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 subframes support communication in unlicensed or contention-based shared spectrum, adaptive uplink/downlink that can be flexibly configured on a cell-by-cell basis to dynamically switch between uplink and downlink to meet current traffic demands.

For clarity, certain aspects of the apparatus and techniques may be described below with reference to example 5G NR implementations or in a 5G-centric manner, and 5G terminology may be used as an illustrative example in the sections described below; however, the description is not intended to be limited to 5G applications.

Further, it should be appreciated that in operation, a wireless communication network adapted according to the concepts herein may operate with any combination of licensed or unlicensed spectrum depending on load and availability. It will be apparent to those of ordinary skill in the art, therefore, that the systems, apparatus, and methods described herein may be applied to other communication systems and applications in addition to the specific examples provided.

While aspects and implementations are described in this application by way of illustration of some examples, those skilled in the art will appreciate that additional implementations and use cases may occur in many different arrangements and scenarios. The innovations described herein may be implemented across many different platform types, devices, systems, shapes, sizes, packaging arrangements. For example, embodiments and/or uses may be produced via integrated chip embodiments 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 may or may not be specifically directed to use cases or applications, applicability of the various types of innovations described may occur. Implementations may 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 of the described aspects. In some practical arrangements, a device incorporating the described aspects and features may also necessarily include additional components and features to implement and practice the claimed and described embodiments. It is intended that the innovations described herein may be practiced in a wide variety of implementations including both large/small devices of different sizes, shapes, and structures, chip-scale components, multi-component systems (e.g., RF chains, communication interfaces, processors), distributed arrangements, end user devices, and the like.

Fig. 1 is a block diagram illustrating details of an example wireless communication system. The wireless communication system may include a wireless network 100. The wireless network 100 may, for example, comprise a 5G wireless network. As will be appreciated by those skilled in the art, the components appearing in fig. 1 are likely to have associated corresponding 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.).

The wireless network 100 shown in fig. 1 includes a number of base stations 105 and other network entities. A base station may be a station in communication with a UE and may also be referred to as an evolved node B (eNB), a next generation eNB (gNB), an access point, etc. Each base station 105 may 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 this coverage area depending on the context in which the term is used. In implementations of wireless network 100 herein, base stations 105 may be associated with the same operator or different operators (e.g., wireless network 100 may include multiple operator wireless networks). Additionally, in implementations of the wireless network 100 herein, the base station 105 may provide wireless communications using one or more of the same frequencies as the neighboring cells (e.g., one or more frequency bands of licensed spectrum, unlicensed spectrum, or a combination thereof). In some examples, each base station 105 or UE 115 may be operated by more than one network operating entity. In other examples, each base station 105 and UE 115 may be operated by a single network operating entity.

A base station may provide communication coverage for a macrocell or a small cell such as a pico cell or a femto cell and/or other types of cells. A macro cell typically covers a relatively large geographical area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription with the network provider. Small cells, such as pico cells, typically cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription with the network provider. Small cells, such as femto cells, typically also cover relatively small geographic areas (e.g., homes), and may provide limited access by UEs having an association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG), UEs for users in homes, etc.), in addition to unrestricted access. The base station for a macro cell may be referred to as a macro base station. A base station for a small cell may be referred to as a small cell base station, pico base station, femto base station, or home base station. In the example shown in fig. 1, base stations 105D and 105e are conventional macro base stations, while base stations 105a-105c are macro base stations implemented with one of 3-dimensional (3D), full-dimensional (FD), or massive MIMO. The base stations 105a-105c take advantage of their higher dimensional MIMO capabilities to increase coverage and capacity with 3D beamforming in elevation and azimuth beamforming. The base station 105f is a small cell base station, which may be a home node or a portable access point. A base station may support one or more (e.g., two, three, four, etc.) cells.

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

The UEs 115 are dispersed throughout the wireless network 100 and each UE may be fixed or mobile. It should be appreciated that while mobile devices are commonly referred to as User Equipment (UE) in standards and specifications promulgated by 3GPP, those skilled in the art may refer to such devices additionally or otherwise as Mobile Stations (MS), subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless communication devices, remote devices, mobile subscriber stations, access Terminals (ATs), mobile terminals, wireless terminals, remote terminals, handsets, terminals, user agents, mobile clients, gaming devices, augmented reality devices, vehicle component devices/modules, or some other suitable terminology. In this document, a "mobile" device or UE does not necessarily have the capability to move, and may be stationary. Some non-limiting examples of mobile devices may include, for example, implementations of one or more UEs 115, including mobile, cellular, smart phone, session Initiation Protocol (SIP) phone, wireless Local Loop (WLL) station, laptop, personal Computer (PC), notebook, netbook, smartbook, tablet, and Personal Digital Assistant (PDA). The mobile device may also be an "internet of things" (IoT) or "internet of everything" (IoE) device, such as an automobile or other transportation vehicle, satellite radio, global Positioning System (GPS) device, logistics controller, drone, multi-axis aircraft, four-axis aircraft, smart energy or security device, solar panel or solar array, municipal lighting, water, or other infrastructure; industrial automation and enterprise equipment; consumer and wearable devices such as eyeglasses, wearable cameras, smart watches, health or fitness trackers, mammalian implantable devices, gesture tracking devices, medical devices, digital audio players (e.g., MP3 players), cameras, gaming machines, and the like; and digital home or smart home devices such as home audio, video and multimedia devices, appliances, sensors, vending machines, smart lighting, home security systems, smart meters, etc. In one aspect, the UE may be a device comprising a Universal Integrated Circuit Card (UICC). In another aspect, the UE may be a device that does not include a UICC. In some aspects, UEs that do not include UICCs may also be referred to as IoE devices. The UEs 115a-115d of the implementation shown in fig. 1 are examples of mobile smart phone type devices that access the wireless network 100. The UE may also be a machine specifically configured for connection communications, including Machine Type Communications (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT), etc. The UEs 115e-115k shown in fig. 1 are examples of various machines configured for communication that access the wireless network 100.

A mobile device such as UE 115 may be capable of communicating with any type of base station, whether macro, pico, femto, relay, etc. In fig. 1, the communication link (denoted lightning) indicates the radio transmission between the UE and the serving base station (the serving base station is the base station designated for serving the UE on the downlink and/or uplink), or the desired transmission between the base stations, and the backhaul transmission between the base stations. The UE may operate as a base station or other network node in some scenarios. Backhaul transmissions between base stations of wireless network 100 may occur when wired and/or wireless communication links are used.

In operation, at wireless network 100, base stations 105a-105c serve UEs 115a and 115b using 3D beamforming and coordinated spatial techniques (e.g., coordinated multipoint (CoMP) or multi-connection). Macro base station 105d performs backhaul communications with base stations 105a-105c and small cell base station 105 f. Macro base station 105d also transmits multicast services subscribed to and received by UEs 115c and 115 d. Such multicast services may include mobile televisions or streaming video, or may include other services for providing community information such as weather emergency or alerts such as amber alerts or gray alerts.

The wireless network 100 of the implementation supports mission critical communications with ultra-reliable and redundant links for mission critical devices such as the UE 115e as an unmanned aerial vehicle. The redundant communication links with UE 115e include those from macro base stations 105d and 105e and small cell base station 105f. Other machine type devices such as UE 115f (thermometer), UE 115g (smart meter) and UE 115h (wearable device) may communicate directly with base stations such as small cell base station 105f and macro base station 105e over wireless network 100 or in a multi-hop configuration by communicating with another user device relaying its information to the network, such as UE 115f communicating temperature measurement information to smart meter UE 115g, which is then reported to the network by small cell base station 105f. The wireless network 100 may also provide additional network efficiency through dynamic, low latency TDD/FDD communications, such as in a vehicle-to-vehicle (V2V) mesh network between UEs 115i-115k communicating with the macro base station 105 e.

Fig. 2 illustrates a block diagram conceptually showing an example design of a base station 105 and a UE 115, which may be one of any of the base stations and UEs in fig. 1. For a restricted association scenario (as described above), the base station 105 may be the small cell base station 105f in fig. 1, and the UE 115 may be the UE 115c or 115D operating in the service area of the base station 105f, which UE 115 would be included in the list of accessible UEs of the small cell base station 105f for access to the small cell base station 105f. Base station 105 may also be some other type of base station. As shown in fig. 2, base station 105 may be equipped with antennas 234a through 234t and UE 115 may be equipped with antennas 252a through 252r for facilitating wireless communications.

At the base station 105, a transmit processor 220 may receive data from a data source 212 and control information from a controller/processor 240. The control information may be used for a Physical Broadcast Channel (PBCH), a Physical Control Format Indicator Channel (PCFICH), a physical hybrid ARQ (automatic repeat request) indicator channel (PHICH), a Physical Downlink Control Channel (PDCCH), an Enhanced Physical Downlink Control Channel (EPDCCH), an MTC Physical Downlink Control Channel (MPDCCH), and the like. The data may be for PDSCH and the like. In addition, the transmit processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. The transmit processor 220 may also generate reference symbols, e.g., for Primary Synchronization Signals (PSS) and Secondary Synchronization Signals (SSS), as well as cell-specific reference signals. A Transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if desired, and may provide output symbol streams to Modulators (MODs) 232a through 232t. For example, spatial processing performed on data symbols, control symbols, or reference symbols may include precoding. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may 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 may be transmitted via antennas 234a through 234t, respectively.

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

On the uplink, at UE 115, transmit processor 264 may receive and process data from data source 262 (e.g., for a Physical Uplink Shared Channel (PUSCH)) and control information from controller/processor 280 (e.g., for a Physical Uplink Control Channel (PUCCH)). In addition, transmit processor 264 may also generate reference symbols for the reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if necessary, further processed by modulators 254a through 254r (e.g., for SC-FDM, etc.), and transmitted to base station 105. At the base station 105, the uplink signals from the UE 115 may be received by the antennas 234, processed by the demodulators 232, detected by a MIMO detector 236 if needed, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 115. The receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to a controller/processor 240.

Controllers/ processors 240 and 280 may direct the operation at base station 105 and UE 115, respectively. The controller/processor 240 and/or other processors and modules at the base station 105 and/or the controller/processor 280 and/or other processors or modules at the UE 115 may perform or direct the execution of various processes for the techniques described herein (e.g., to perform or direct the execution shown in fig. 6-8), and/or the execution of other processes for the techniques described herein. Memories 242 and 282 may store data and program codes for base station 105 and UE 115, respectively. The scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.

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

For example, the network operating entity may be allocated certain time resources reserved for exclusive communication by the network operating entity using the entire shared spectrum. The network operating entity may also be allocated other time resources in which the entity is given priority over other network operating entities using the shared spectrum for communication. If the prioritized network operating entity does not use these resources, these time resources that are preferentially used by the network operating entity may be utilized by other network operating entities on an opportunistic basis. Any network operator may be allocated additional time resources to use on an opportunistic basis.

Arbitration between different network operator entities for access to the shared spectrum and time resources may be centrally controlled by separate entities, autonomously determined by a predefined arbitration scheme, or dynamically determined based on interactions between wireless nodes of the network operator.

In some cases, the UE 115 and the base station 105 may operate in a shared radio frequency spectrum, which may include licensed or unlicensed (e.g., contention-based) spectrum. In the unlicensed frequency portion of the shared radio frequency spectrum band, the UE 115 or the base station 105 may conventionally perform a medium sensing procedure to compete for access to the spectrum. For example, the UE 115 or the base station 105 may perform a listen before talk or Listen Before Talk (LBT) procedure, such as Clear Channel Assessment (CCA), prior to communication to determine whether a shared channel is available. In some implementations, the CCA may include an energy detection procedure to determine whether there are any other active transmissions. For example, the device may infer that a change in the Received Signal Strength Indicator (RSSI) of the power meter indicates that the channel is occupied. In particular, signal power concentrated in a certain bandwidth and exceeding a predetermined noise floor may be indicative of another wireless transmitter. The CCA may also include detection of a particular sequence indicating use of the channel. For example, another device may transmit a particular preamble prior to transmitting the data sequence. In some cases, the LBT procedure may include the wireless node adjusting its own backoff window based on energy detected on the channel and/or acknowledgement/negative acknowledgement (ACK/NACK) feedback of packets transmitted by itself as a collision proxy.

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

As shown in fig. 3, UE 115x and UE 115y may communicate with each other via SL 350. In some cases, SL 350 may be a direct link via which UE 115x sends/receives messages directly to/from UE 115y, and via which UE 115y sends/receives messages directly to/from UE 115x, 115 x. In an implementation, UEs 115x and 115y may be configured to follow a SL communication scheme in which transmission/reception occurs only in specified resources (e.g., time, frequency, etc.). Thus, SL communication between UE 115x and UE 115y may be limited to particular resources, and in these implementations, SL communication between UE 115x and UE 115y may not occur outside of these resources.

In some implementations, SL communication between UE115x and UE115 y may operate in one of various modes. For example, SL communication over SL 350 between UE115x and UE115 y may operate in SL mode 1. In SL mode 1, a base station (e.g., base station 105 z) may schedule SL transmissions. For example, in SL mode 1, a UE may transmit to another UE on SL, but the transmitting UE must obtain transmission authorization from the serving base station before allowing it to transmit to the receiving UE on SL. In SL mode 1, the transmitting UE is not allowed to transmit on SL to the receiving UE without requesting a transmission grant. For example, UE115x may wish to transmit to UE115 y over SL 350. In that case, UE115x may send a request for transmission authorization to base station 105 z. A request for transmission grants may be sent on the uplink from UE115x to base station 105 z. Once the base station grants transmission grants to UE115x, UE115x may transmit to UE115 y over SL 350.

In an implementation, the transmission grant may be sent on the downlink (e.g., in a Downlink Control Information (DCI) message) from the base station 105z to the UE115 x. The transmission grant may be provided in a DCI message including a resource allocation to the transmitting UE. The transmission grant may be provided in a DCI message including a resource allocation to the transmitting UE. For example, the transmission grant from base station 105z may include an indication of the transmitting UE indicating which resource to use to send the SL transmission on SL to the receiving UE. For example, the transmission grant sent by base station 105z to UE115x may include an indication of which resources UE115x is to use when transmitting to UE115 y.

In another example, SL communication over SL 350 between UE115x and UE115 y may operate in SL mode 2. In SL mode 2, a UE (e.g., UE115x and/or UE115 y) may schedule SL transmissions on SL to another UE. For example, in SL mode 2, a UE may transmit to another UE on SL without the transmitting UE obtaining a transmission grant from the serving base station before it is allowed to transmit to the receiving UE on SL. For example, UE115x may wish to transmit to UE115 y over SL 350. In that case, UE115x may schedule SL transmissions to UE115 y and need not 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 the serving base station before transmitting to another UE on the SL.

In some implementations, SL transmissions may follow a particular scheme. For example, once UE115x receives the transmission grant, UE115x may send SL Control Information (SCI) to UE115 y (e.g., using the resources specified in the transmission grant). In an implementation, SCI may be transmitted from UE115x to UE115 y on a Physical SL Control Channel (PSCCH). SCI may be configured to indicate to UE115 y that UE115x is to send a subsequent data transmission to UE115 y (e.g., a data transmission on SL 350 from UE115x after the SCI transmission from UE115 x). In an implementation, the subsequent data transmission may be a data transmission from UE115x to UE115 y on a Physical SL Shared Channel (PSSCH). In an implementation, the SCI may include an indication of which resources the UE115x will use to send subsequent data transmissions (e.g., on the PSSCH), as well as other transmission parameters.

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

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

In an implementation, a base station desiring to transmit data to a DRX UE may 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, the UE 115y may monitor WUS even during periods of inactivity. For example, the base station 105z may transmit WUS410 to the UE 115y during the inactive period of the DRX cycle 450. In response to receiving WUS410, UE 115y may monitor (e.g., on PDCCH) for DCI transmissions from base station 105z during active period 401 of DRX cycle 451. In some cases, UE 115y may power up its transceiver and/or any other components in order to receive DCI transmissions. In some implementations, in the event WUS is not received, UE 115y may not be configured or receive DCI even during the active period.

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

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 115 x. Thus, when UE 115y is operating in DRX mode, SL communication between UEs 115x and 115y is not possible. On the other hand, to support SL communication, UE 115y will not be able to operate in DRX mode and therefore any power savings due to DRX mode will be lost. More importantly, there is currently no existing solution to address these drawbacks of existing systems.

Various aspects of the present disclosure relate to systems and methods for configuring and providing side-uplink DRX communications. In aspects, the techniques disclosed herein may be applicable to side-link operation in mode 1 and/or mode 2.

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

Aspects of the present disclosure provide for a UE operating in SL mode 2 to implement a DRX scheme in which the UE is able to provide DRX communication with a serving base station while in SL mode 2, while maintaining DRX communication with another UE on SL. In some embodiments, in addition to the Uu DRX scheme between the DRX UE and the base station, a SL DRX scheme for communication over SL between the DRX UE and other UEs may be provided. In aspects, a DRX UE may monitor SL for transmissions from other UEs using a SL DRX configuration, and may monitor transmissions in DL (e.g., from a base station) using a Uu DRX configuration at the same time, where the SL DRX configuration and Uu DRX configuration may be different. In an embodiment, an active period of a SL DRX cycle (e.g., a DRX cycle for a SL DRX configuration of SL between a DRX UE and another UE) may be extended (e.g., by starting/restarting an inactivity timer) based on an event regarding SL. In further embodiments, the active period of the Uu DRX cycle (e.g., the DRX cycle for the Uu DRX configuration of the link between the base station and the DRX UE) may be extended (e.g., by starting/restarting an inactivity timer) based on events related to the link between the base station and the DRX UE.

In an embodiment, the DRX UE may be configured to start or restart an inactivity timer of the SL DRX cycle in a first symbol after the end of control channel (e.g., physical SL Control Channel (PSCCH)) reception when the PSCCH indicates a subsequent SL transmission from another UE. In an embodiment, the DRX UE may be configured to start or restart the inactivity timer of the Uu DRX cycle in the first symbol after the end of control channel (e.g., PDCCH)) reception when the PDCCH indicates a subsequent transmission (downlink transmission or uplink transmission) from the base station. In aspects, the described techniques may be referred to as DRX with SL in mode 2.

Fig. 5 is a diagram illustrating an example implementation of a SL DRX procedure for implementing an aspect of the present disclosure. As shown in fig. 5, base station 105z may be in DRX communication with UE 115y over link 351. Meanwhile, UE 115y may also perform SL DRX communication with UE 115x on SL 350. As shown, UE 115y may be configured to include one or more DRX cycles (e.g., 550-552). The DRX cycle of UE 115y may include active periods and inactive periods. For example, DRX cycles 550-552 may include active periods 500-502, respectively. In these aspects, UE 115y may monitor control information from base station 105z and/or from UE 115x only during active periods 500-502. In these aspects, UE 115y may monitor DCI and/or SCI during the active period, but may not monitor DCI and/or SCI outside of the active period (e.g., during the inactive period). 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 of receiving DCI and/or SCI may be extended. In this sense, the active period of the DRX cycle of UE 115y may be a function of events in the link between base station 105z and UE 115y and in SL between UE 115y and UE 115 x.

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

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

As also shown in fig. 5, SL resources 560a-d may occur during DRX cycles 550-552. As described above, SL transmissions between UEs 115x and 115y may be limited or restricted to these SL resources 560a-d. In this way, UE 115x may transmit using any of SL resources 560a-d based on the grant from base station 105 z. For example, UE 115x may desire to send data to UE 115y over SL 350. In this case, UE 115x may send a request for transmission authorization (e.g., uplink via link 351) to base station 105 z. In some embodiments, the transmission grant request sent by UE 115x may include an indication that the requested transmission grant is for transmission to UE 115y on SL 350. In additional or alternative embodiments, the transmission grant request sent by UE 115x may not include an explicit indication that the requested transmission grant is for transmission to UE 115y on SL 350. In these cases, the base station 105z may determine that the transmission grant request from the UE 115x may be targeted to the UE 115y based on a Buffer Status Report (BSR) from the UE 115 x.

In aspects, base station 105z may grant UE115 x a request for transmission grants to be sent on SL 350. In this case, the base station 105z may send a transmission grant to the UE115 x. In an embodiment, the transmission grant may include an indication of the requested transmission grant for transmission to UE115y on SL 350. In an embodiment, the transmission grant may be provided to UE115 x in a DCI message including a resource allocation of SL resources in which UE115 x may transmit to UE115 y. In an embodiment, the allocated SL resources may be part of SL resources to which SL communication may be restricted. For example, base station 105z may allocate SL resource 560d to UE115 x for transmitting data to UE115 y. In this example, SL resource 560d falls within active period 502 of DRX cycle 552.

In an embodiment, UE115y may monitor SCI transmissions from UE115 x during active period 502. In some embodiments, prior to SCI transmission in SL resource 506d from UE115 x, base station 105z may send WUS 510 to UE115y to ensure that UE115y is monitoring for SCI transmission on SL in SL resource 560d during active period 502. In an embodiment, WUS 510 may be transmitted to UE115y by base station 105z in response to base station 105z granting transmission grants to UE115 x.

In an embodiment, upon receiving a transmission grant for a transmission on SL 350 to UE115 y in SL resource 560d, UE115x may transmit control information (e.g., SCI) to UE115 y in PSCCH on SL 350 in SL resource 560 d. In an embodiment, the SCI may include an indication of which resources the UE115x will use to send subsequent data transmissions (e.g., data transmissions on the PSSCH), as well as other transmission parameters.

In an implementation, after sending the SCI to UE115 y on SL 350 in SL resource 560d during active period 502, UE115x may send a subsequent data transmission on the PSSCH using the resources specified in the SCI. In some cases, the UE115 y may provide feedback (e.g., on the PSFCH) after receiving the PSSCH transmission.

In an embodiment, in response to receiving a SCI transmission in a PSCCH in SL resource 560d during active period 502, UE115 y may extend active period 502 by an extended period 521 when the SCI in the PSCCH indicates that a subsequent data transmission is to be sent from UE115x to UE115 y.

In some embodiments, the base station 105z may transmit data (e.g., DCI) to the UE115 y during the extended active period of the DRX cycle 552. In an embodiment, the active period 502 may be extended by starting and/or restarting an inactivity timer associated with the DRX cycle 552.

Fig. 6 is a block diagram illustrating example blocks performed to implement an aspect of the present disclosure. Example blocks will also be described with respect to the UE 115 shown in fig. 9. Fig. 9 is a block diagram illustrating a UE 115 configured in accordance with an aspect of the present disclosure. The UE 115 includes the structure, hardware, and components as shown in fig. 2 for the UE 115. For example, UE 115 includes a controller/processor 280 that operates to execute logic or computer instructions stored in memory 282 in addition to controlling components of UE 115 that provide features and functions of UE 115. Under the control of the controller/processor 280, the UE 115 sends and receives signals via wireless radio units 901a-r and antennas 252 a-r. The wireless radio units 901a-r include various components and hardware as shown in fig. 2 for UE 115, including modulators/demodulators 254a-r, MIMO detector 256, receive processor 258, transmit processor 264, and TX MIMO processor 266.

It should be noted that the description of the example blocks of fig. 6 is from the perspective of a first UE, which may refer to a UE operating in DRX in mode 1 (e.g., UE 115y described above). In this example, a first UE may be in SL communication with a second UE (e.g., UE 115 x). In an embodiment, a base station (e.g., base station 105 z) may serve one or both of the first UE and the second UE.

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

In an embodiment, the SCI received from the second UE in the PSCCH on the SL may be transmitted by the second UE in response to the second UE receiving a transmission grant from the base station. In this case, as will be described in more detail below with reference to fig. 7, the second UE may request a transmission grant from the base station, and the transmission grant request may include an indication that the first UE of the second UE is the target receiver of the SL transmission of the second UE. In some embodiments, the second UE may not include the indication, but the base station may determine that the first UE is the target receiver of the SL transmission of the second UE based on the BSR associated with the second UE.

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

In an embodiment, the transmission grant may include a configuration for transmitting the SCI to the first UE over the SL. In embodiments, configuring may include specifying which SL resources the second UE is to use to transmit the SCI, and in some embodiments, specifying subsequent data transmissions.

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

At block 601, the first UE, in response to receiving the SCI from the second UE in the PSCCH, extends an active period of a DRX cycle for receiving the SCI in the PSCCH 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 the SL. To implement functionality for such operations, UE 115 executes SL extension logic 902 stored in memory 282 under the control of controller/processor 280. The functionality implemented by the execution environment of SL extension logic 902 allows UE 115 to perform activity period extension operations in accordance with aspects herein.

In an embodiment, the active period of the extended DRX cycle includes one of: the inactivity timer associated with the DRX cycle is started at the end of receiving the SCI in the PSCCH from the second UE and restarted at the end of receiving the SCI in the PSCCH from the second UE.

In an embodiment, the first UE may receive a DCI message from the base station during an extended active 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.

Fig. 7 is a block diagram illustrating example blocks performed to implement an aspect of the present disclosure. Example blocks will also be described with respect to the UE 115 shown in fig. 9. It should be noted that the description of the example blocks of fig. 7 is from the perspective of a first UE, which in this discussion may refer to a UE (e.g., UE 115x described above) that communicates with a second UE (e.g., UE 115y described above) operating in DRX with SL in mode 1. In an embodiment, a base station (e.g., base station 105 z) may serve one or both of the first UE and the second UE.

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

In an embodiment, the transmission grant received from the base station may be received in response to the first UE sending a request for the transmission grant to the base station. In an embodiment, the transmission grant request may include an indication of the first UE indicating that the second UE is the target receiver of the SL transmission of the first UE. In some embodiments, the first UE may not include the indication, but the base station may determine that the second UE is the target receiver of the SL transmission of the first UE based on a BSR associated with the first UE.

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

In an embodiment, the transmission grant may include a configuration for transmitting the SCI to the second UE in the PSCCH over the SL. In embodiments, configuring may include specifying which SL resources the first UE is to use to transmit the SCI, and in some embodiments, specifying subsequent data transmissions.

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

At block 701, a first UE transmits a SCI in a PSCCH to a second UE via the first UE. For example, a first UE (e.g., UE 115) communicating with a second UE over SL may transmit SCI in PSCCH via antennas 252a-r and wireless radios 901 a-r. In an embodiment, the second UE may operate in a DRX mode (e.g., DRX mode 1), and SCI in the PSCCH may be received by the second UE during an active period of the second UE's DRX cycle. In an embodiment, the SCI may include a configuration for subsequent data transmission from the first UE to the second UE over the SL.

In some embodiments, sending 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 receiving the SCI in the PSCCH when the PSCCH indicates that a subsequent data transmission is from the first UE to the second UE on the SL.

In an embodiment, the active period of the extended DRX cycle includes one of: the method includes starting an inactivity timer associated with a DRX cycle at the end of receiving an SCI in a PSCCH from a first UE, and restarting the inactivity timer associated with the DRX cycle at the end of receiving an SCI in a PSCCH from the first UE.

It should be noted that the description of the example blocks of fig. 6 is from the perspective of a first UE, which may refer to a UE operating in DRX in mode 1 (e.g., UE 115y described above). In this example, a first UE may be in SL communication with a second UE (e.g., UE 115 x). In an embodiment, a base station (e.g., base station 105 z) may serve one or both of the first UE and the second UE.

Fig. 8 is a block diagram illustrating example blocks performed to implement an aspect of the present disclosure. Example blocks will also be described with respect to the base station 105 shown in fig. 10. Fig. 8 is a block diagram illustrating a base station 105 configured in accordance with an aspect of the present disclosure. The base station 105 includes the structure, hardware, and components as shown in fig. 2 for the base station 105. For example, the base station 105 includes a controller/processor 240, the controller/processor 240 operative to execute logic or computer instructions stored in a memory 242 and to control components of the base station 105 that provide features and functions of the base station 105. Under the control of the controller/processor 240, the base station 105 transmits and receives signals via the wireless radio units 1001a-t and antennas 234 a-t. The wireless radio unit 1001a-t includes various components and hardware as shown in fig. 2 for base station 105, including modulators/demodulators 232a-t, a MIMO detector 236, a receive processor 238, a transmit processor 220, and a TX MIMO processor 230.

It should be noted that the description of the example blocks of fig. 8 is from the perspective of a base station, which may refer to a base station (e.g., base station 105 z) serving one or both of the first UE and the second UE. In this example, the second UE may be a UE operating in DRX with SL in mode 1 (e.g., UE 115y described above), and the first UE (e.g., UE 115 x) may be in SL communication with the second UE.

At block 800, a base station serving a first UE and a second UE sends a transmission grant to the first UE. To implement the functionality for such operations, the base station 105 executes the transmit logic 1002 stored in the memory 242 under the control of the controller/processor 240. The functionality implemented by the execution environment of the transmit logic 1002 allows the base station 105 to perform transmission grant transmit operations in accordance with various aspects herein. In an embodiment, a first UE may communicate with a second UE on SL, and the second UE may operate in DRX mode.

In an embodiment, the transmission grant may be transmitted to the first UE in DCI and may be transmitted in response to receiving a request for the transmission grant from the first UE. In an embodiment, the transmission grant request may include an indication of the first UE indicating that the second UE is the target receiver of the SL transmission of the first UE. In some embodiments, the first UE may not include the indication, but the base station may determine that the second UE is the target receiver of the SL transmission of the first UE based on a BSR associated with the first UE.

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

In an embodiment, the transmission grant may include a configuration for transmitting the SCI from the first UE to the second UE in the PSCCH over the SL. In embodiments, configuring may include specifying which SL resources the first UE is to use to transmit the SCI, and in some embodiments, specifying subsequent data transmissions.

In some embodiments, sending the transmission grant to the first UE may cause the first UE to send the SCI in the PSCCH to the second UE via the SL between the first UE and the second UE. In an embodiment, SCI in the PSCCH may be transmitted by a first UE and/or received by a second UE during an active period of a DRX cycle of the second UE.

In an embodiment, the base station may send WUS to the second UE in response to sending a transmission grant to the first UE. WUS may be sent to ensure that the second UE is "awake" during the next active period of the DRX cycle to monitor SCI transmissions from the first UE. In some embodiments, the base station may transmit WUS to the second UE before the first UE transmits SCI to the second UE in the PSCCH.

In an embodiment, receiving the SCI in the PSCCH from the first 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 that a subsequent data transmission is from the first UE to the second UE on the side link.

In an embodiment, 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 when receiving the SCI in the PSCCH from the first UE ends and causing the second UE to restart the inactivity timer associated with the DRX cycle when receiving the SCI in the PSCCH from the first UE ends.

In an embodiment, the base station may transmit a DCI message to the second UE during an extended active period of the DRX cycle. In these embodiments, the DCI transmitted to the first UE may be after receiving the SCI in the PSCCH from the second UE.

Fig. 11 is a diagram illustrating an example implementation of DRX utilizing SL during mode 2 for implementing an aspect of the present disclosure. As shown in fig. 11, base station 105z may be in DRX communication with UE 115y over link 351. As described above, DRX communication between base station 105z and UE 115y may also be configured with Uu DRX configuration as described above. Meanwhile, UE 115y may also be in DRX communication with UE 115x over SL 350. In this case, DRX communication between UE 115x and UE 115y may be configured with a SL DRX configuration. It can be seen that UE 115y may be configured with two DRX configurations (e.g., uu DRX configuration and SL DRX configuration) using different DRX timers. In this sense, as described above, UE 115y may be configured to implement DRX communication with both the base station and the SL UE, thereby enabling UE 115y to take advantage of the benefits of DRX communication (e.g., power saving) while implementing the SL communication scheme.

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

As further shown in fig. 11, the SL DRX configuration for SL DRX communication between UE 115y and UE 115x may include one or more SL DRX cycles (e.g., 1170-1172). The SL DRX cycle of UE 115y may include active periods and inactive periods. For example, SL DRX periods 1170-1172 may include active periods 1180-1182, respectively. In these aspects, UE 115y may monitor control information from UE 115x during active periods 1180-1182. In these aspects, UE 115y may monitor SCI transmissions from UE 115x on SL 350 during the active period, but may not monitor SCI transmissions outside of the active period (e.g., during the inactive period). The active period of receiving SCI may be extended when SCI transmissions (e.g., in PSCCH) are detected or received by UE 115y during the active period. In this sense, the active period of the SL DRX cycle of UE 115y may be a function of events in SL between UE 115y and UE 115 x.

In aspects, extending the active period of the Uu DRX cycle and/or the SL DRX cycle may include starting and/or restarting an inactivity timer associated with the corresponding DRX cycle that received the control information (DCI or SCI). For example, as shown in fig. 11, in response to UE 115y receiving a DCI transmission on PDCCH 1130 during active period 1101 of Uu DRX cycle 1151, active period 1101 may be extended by extended period 1120 after the end of PDCCH reception. In this example, in response to UE 115y receiving a SCI transmission on the PSCCH in SL resource 1160c during an active period 1181 of SL DRX cycle 1171, active period 1181 may be extended by an extended period 1121 after the end of PSCCH reception.

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

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

As also shown in fig. 11, SL resources 1160a-f may occur during DRX cycles 1170-1172. As described above, SL transmissions between UEs 115x and 115y may be limited or restricted to these SL resources 1160a-f. Thus, UE 115x may transmit using any of SL resources 1160a-f. For example, UE 115x may desire to transmit data to UE 115y over SL 350. In this case, UE 115x may schedule SCI transmissions on SL to UE 115y in one of SL resources 1160a-f.

In an embodiment, UE 115y may monitor SCI transmissions from UE 115x during periods of activity 1180-1182. In some embodiments, UE 115y may monitor SCI transmissions only during the duration of SL resources that overlap with the active period. For example, activity period 1180 overlaps with SL resource 1160 a. In this case, UE 115y may monitor SCI transmissions only during the duration of SL resource 1160a and may not monitor SCI transmissions during the portion of active period 1180 that does not overlap with SL resource 1160 a. In other embodiments, the UE 115y may monitor during the entire activity period 1180. In another example, UE 115y may not monitor during SL resource 1160b or may forego monitoring SCI transmissions because SL resource 1160b does not overlap with the active period.

In the example shown in fig. 11, UE115 x may send control information (e.g., SCI) to UE115y on SL 350 in SL resource 1160 c. In an embodiment, the SCI may include an indication of which resources the UE115 x will use to send subsequent data transmissions (e.g., data transmissions on the PSSCH), as well as other transmission parameters.

In an implementation, after sending the SCI to UE115y on SL 350 in SL resource 1160c during active period 1171, UE115 x may send a subsequent data transmission on the PSSCH using the resources specified in the SCI. In some cases, the UE115y may provide feedback (e.g., on the PSFCH) after receiving the PSSCH transmission.

In an embodiment, in response to receiving the SCI transmission in the PSCCH in SL resource 1160c during active period 1181, UE115y may extend active period 1181 for extended period 1121 when the SCI in the PSCCH indicates that a subsequent data transmission is to be sent from UE115 x to UE115 y. In an embodiment, the active period 1181 may be extended by starting and/or restarting an inactivity timer associated with the SL DRX cycle 1171.

Fig. 12 is a block diagram illustrating example blocks performed to implement an aspect of the present disclosure. Example blocks will also be described with respect to the UE115 shown in fig. 9.

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

At block 1200, a first UE in communication with a second UE over SL transmits a SL DRX configuration to the second UE. To implement functionality for such operations, UE 115 executes transmit logic 902 stored in memory 282 under the control of controller/processor 280. The functionality implemented by the execution environment of the transmit logic 902 allows the UE 115 to perform SL DRX configuration transmit operations according to aspects herein. In an embodiment, the SL DRX configuration may specify the SL DRX mode of the first UE with respect to SL. The SL DRX mode of the first UE may include at least one SL DRX cycle having an active period for reception on SL and an inactive period for reception on SL. During the active period, the first UE may monitor for transmissions (e.g., SCI transmissions) from the second UE. During the period of inactivity, the first UE may not monitor for transmissions (e.g., SCI transmissions) from the second UE.

In an embodiment, the configuration of SL between the first UE and the second UE may comprise at least one SL resource. In these embodiments, transmission between the first UE and the second UE on the SL may be limited to at least one SL resource. In an embodiment, the communication between the first UE and the second UE over SL is performed without requesting a transmission grant from the base station.

In an embodiment, the first UE may be further configured for Uu DRX mode with respect to communication with the base station. In an embodiment, the Uu DRX mode of the first UE may 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 may monitor for transmissions (e.g., DCI transmissions) from the base station. During the inactivity period, the first UE may not monitor for transmissions (e.g., DCI transmissions) from the base station.

At block 1201, the first UE receives SCI in the PSCCH from the second UE over the SL. For example, a first UE (e.g., UE 115) communicating with a second UE over SL may receive SCI via antennas 252a-r and wireless radios 901 a-r. In an embodiment, SCI in the PSCCH may be received by the first UE during an active period of the SL DRX cycle of the first UE. In an embodiment, receiving the SCI in the PSCCH from the second UE may include monitoring, by the first UE, SL resources associated with the first UE for transmissions from the SCI of the second UE. In an embodiment, the monitored SL resources may overlap with an active period of the SL DRX cycle of the first UE.

At block 1202, the first UE, in response to receiving the SCI in the PSCCH from the second UE, extends an active period of at least one SL DRX cycle of receiving the SCI in the PSCCH from the second UE when the SCI in the PSCCH indicates a subsequent data transmission on 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 the control of controller/processor 280. The functionality implemented by the execution environment of SL extension logic 902 allows UE 115 to perform activity period extension operations in accordance with aspects herein.

In an embodiment, extending the active period of the SL DRX cycle includes one of: the inactivity timer associated with the SL DRX cycle is started at the end of receiving the SCI in the PSCCH from the second UE and restarted at the end of receiving the SCI in the PSCCH from the second UE.

Fig. 13 is a block diagram illustrating example blocks performed to implement an aspect of the present disclosure. Example blocks will also be described with respect to the UE 115 shown in fig. 9. It should be noted that the description of the example block of fig. 13 is from the perspective of a first UE, which in this discussion may refer to a UE (e.g., UE 115x described above) that communicates with a second UE (e.g., UE 115y described above) operating in DRX with SL in mode 2. In an embodiment, a base station (e.g., base station 105 z) may serve one or both of the first UE and the second UE.

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

In an embodiment, the configuration of SL between the first UE and the second UE may comprise at least one SL resource. In these embodiments, transmission between the first UE and the second UE on the SL may be limited to at least one SL resource. In an embodiment, the communication between the first UE and the second UE over SL is performed without requesting a transmission grant from the base station.

In an embodiment, the second UE may be further configured for Uu DRX mode with respect to communication with the base station. In an embodiment, the Uu DRX mode of the second UE may 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 may monitor for transmissions (e.g., DCI transmissions) from the base station. During the inactivity period, the second UE may not monitor for transmissions (e.g., DCI transmissions) from the base station.

At block 1301, the first UE transmits the SCI to the second UE in the PSCCH. In an embodiment, SCI in the PSCCH may 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 transmit logic 902 stored in memory 282 under the control of controller/processor 280. The functionality implemented by the execution environment of the transmit logic 902 allows the UE 115 to perform SCI transmit operations in accordance with aspects herein.

In an embodiment, transmitting the SCI to the second UE in the PSCCH includes transmitting the SCI in the PSCCH in at least one SL resource of the SL between the first UE and the second UE that overlaps with an active period of at least one SL DRX cycle of the second UE. In some embodiments, SL resources for transmissions from SCI of the first UE are monitored by the second UE.

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

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 when receiving the SCI in the PSCCH from the first UE ends and causing the second UE to restart the inactivity timer associated with the SL DRX cycle when receiving the SCI in the PSCCH from the first UE ends.

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

The components, functional blocks, and modules described herein (e.g., functional blocks and modules in fig. 2) may include processors, electronics devices, hardware devices, electronics components, logic circuits, memories, software code, firmware code, etc., or any combination thereof. Furthermore, the features discussed herein may be implemented via dedicated processor circuitry, via executable instructions, and/or combinations thereof.

Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps associated with the disclosure herein (e.g., the logical blocks in fig. 6-8) may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may 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. The skilled artisan will also readily recognize that the order or combination of components, methods, or interactions described herein are merely examples, and that components, methods, or interactions of the various aspects of the disclosure may be combined or performed in ways other than those illustrated and described herein.

The various illustrative logical blocks, modules, and circuits described in connection with the disclosure herein may 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 may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

The steps of a method or algorithm described in connection with the disclosure herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may 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 the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.

In one or more exemplary designs, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may 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 general purpose or special purpose processor. Further, the connection may be properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL), then the coaxial cable, fiber optic cable, twisted pair, or DSL are included in the definition of medium. Disk and disc, as used herein, includes Compact Disc (CD), laser disc, optical disc, digital Versatile Disc (DVD), hard disk, solid state disc, and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

As used herein (including in the claims), when the term "and/or" is used in a list of two or more items, it 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 may contain a alone; b alone; c alone; a combination of A and B; a combination of a and C; a combination of B and C; or a combination of A, B and C. Furthermore, as used herein, including in the claims, the use of "or" in a list of items ending in at least one of "… …" means a list of references such that, for example, a list of at least one of "A, B or C" refers to any of these of a or B or C or AB or AC or BC or ABC (i.e., a and B and C), or any combination thereof.

The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (30)

1. A method of wireless communication, comprising:

receiving, by a first User Equipment (UE) in communication with a second UE on a sidelink, sidelink control information from the second UE in a Physical Sidelink Control Channel (PSCCH), wherein the first UE operates in a Discontinuous Reception (DRX) mode, and wherein the PSCCH is received by the first UE during an active period of a DRX cycle of the first UE; and

in response to receiving the sidelink control information from the second UE in the PSCCH, the active period of the DRX cycle in which the sidelink control information is received from the second UE in the PSCCH is extended 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 the end of receiving the side-link control information in the PSCCH from the second UE; and

at the end of receiving the side-link control information from the second UE in the PSCCH, restarting the inactivity timer associated with the DRX cycle.

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 subsequent data transmission on the sidelink is intended for the first UE.

5. The method of claim 1, further comprising:

a wake-up signal (WUS) is received by the first UE from a base station before the side-link control information is received in the PSCCH from the second UE.

6. The method of claim 5, further comprising:

in response to receiving the WUS from the base station, the first UE is activated to receive during the active period of the DRX cycle.

7. The method of claim 6, further comprising:

the side-link between the first UE and the second UE is monitored by the first UE for transmission of the side-link control information from the second UE in response to receiving the WUS from the base station.

8. The method of claim 5, wherein the WUS is transmitted from the base station in response to the base station authorizing a transmission grant to the second UE, the transmission grant including a configuration for the subsequent data transmission received by the first UE on the sidelink.

9. The method of claim 1, further comprising:

downlink Control Information (DCI) is received by the first UE from a base station during an extended active period of the DRX cycle, the DCI being received by the first UE after receiving the side downlink control information in the PSCCH from the second UE.

10. The method of claim 1, further comprising:

transmitting to the second UE a SL DRX configuration specifying a SL DRX mode of the first UE with respect to the SL, wherein the SL DRX mode 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.

11. The method of claim 9, wherein the first UE is further configured for a Uu DRX mode with respect to communication with the base station, wherein the Uu DRX mode 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.

12. An apparatus for wireless communication, comprising:

a memory; and

one or more processors coupled to the memory, the memory and the one or more processors configured to:

receiving, by a first User Equipment (UE) in communication with a second UE on a sidelink, a transmission grant from a base station serving the first UE and the second UE;

transmitting, by the first UE, a side-uplink control information (SCI) to the second UE in a physical side-uplink control channel (PSCCH), 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 from the first UE to the second UE on the side-uplink, wherein transmitting the SCI to the second 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 is received when the PSCCH indicates the subsequent data transmission from the first UE to the second UE on the side-link.

13. The apparatus of claim 12, wherein causing the second UE to extend the active period of the DRX cycle comprises one of:

causing the second UE to start an inactivity timer associated with the DRX cycle at the end of receiving the side-uplink control information 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 side-uplink control information in the PSCCH from the first UE.

14. The apparatus of claim 12, wherein the transmission grant received by the first UE includes an indication that the subsequent data transmission is intended for the second UE.

15. The apparatus of claim 12, wherein the memory and the one or more processors are further configured to:

transmitting, by the first UE to the base station, 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.

16. The apparatus of claim 15, 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 before the first UE transmits the SCI to the second UE in the PSCCH, the WUS being transmitted to the second UE when the transmission grant is granted by the base station.

17. The apparatus of claim 16, 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.

18. The apparatus of claim 17, 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 transmissions from the SCI of the first UE in response to receiving the WUS from the base station.

19. A method of wireless communication, comprising:

transmitting, by a first User Equipment (UE) communicating with a second UE on a side-link (SL), SL Control Information (SCI) to the second UE in a Physical SL Control Channel (PSCCH), 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, extending the active period of the at least one SL DRX cycle 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.

20. The method of claim 19, further comprising:

transmitting to the second UE a SL DRX configuration specifying a SL DRX mode of the second UE with respect to the SL, wherein the SL DRX mode 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.

21. The method of claim 19, wherein the first UE is further configured for a Uu DRX mode with respect to communication with a base station, wherein the Uu DRX mode 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.

22. An apparatus for wireless communication, comprising:

a memory; and

one or more processors coupled to the memory, the memory and the one or more processors configured to:

transmitting, 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 side link, the second UE operating in a Discontinuous Reception (DRX) mode,

Wherein the transmission grant causes the first UE to transmit a side-uplink control information (SCI) to the second UE in a physical side-uplink control channel (PSCCH), the SCI including a configuration for subsequent data transmissions from the first UE to the second UE on the side-link,

wherein the SCI in the PSCCH is received by the second UE during an active period of a DRX cycle of the second UE, an

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 side link.

23. The apparatus of claim 22, wherein causing the second UE to extend the active period of the DRX cycle comprises one of:

causing the second UE to start an inactivity timer associated with the DRX cycle upon ending 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 upon ending receiving the SCI in the PSCCH from the first UE.

24. The apparatus of claim 22, wherein the transmission grant comprises an indication that the subsequent data transmission on the sidelink is intended for the second UE.

25. The apparatus of claim 22, wherein the memory and the one or more processors are further configured to:

a request for the transmission grant is received by the base station from the first UE, wherein the request for the transmission grant includes an indication that the subsequent data transmission is intended for the second UE.

26. The apparatus of claim 22, wherein the memory and the one or more processors are further configured to:

determining, by the base station, that the subsequent data transmission is intended for the second UE based on a Buffer Status Report (BSR).

27. The apparatus of claim 22, wherein the memory and the one or more processors are further configured to:

in response to sending the transmission grant to the first UE, a wake-up signal (WUS) is sent by the base station to the second UE, the WUS being sent to the second UE before the first UE sends the SCI to the second UE in the PSCCH.

28. The apparatus of claim 27, 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.

29. The apparatus of claim 27, 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 transmissions from the SCI of the first UE in response to receiving the WUS from the base station.

30. The apparatus of claim 22, wherein the memory and the one or more processors are further configured to:

downlink Control Information (DCI) is transmitted by the base station 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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