Sidelink discontinuous reception (DRX) operation

Abstract

Certain aspects provide a method for wireless communication by a user equipment (UE). The method generally includes determining a configuration associated with a sidelink for at least one communication, monitoring for at least one SCI after entering a sidelink discontinuous reception (DRX) on phase based on the configuration, receiving, from one or more other UEs, at least one SCI for the at least one communication during the sidelink DRX on phase, and determining an extension of the sidelink DRX on phase based on the at least one SCI scheduling at least one first resource for one or more transmissions.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Non-Provisional Application No. 17 / 447,026, filed September 7, 2021, which claims the benefit of and priority to U.S. Provisional Application No. 63 / 082,797, filed September 24, 2020, the entire contents of which are incorporated herein by reference as if fully set forth below in their entirety and for all applicable purposes. TECHNICAL FIELD

[0003] Aspects of the disclosure relate to wireless communications, and more particularly, to techniques for sidelink communications. BACKGROUND

[0004] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, etc. These wireless communication systems can employ multiple-access technologies capable of supporting communication with multiple users by sharing the available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple-access technologies include 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and others.

[0005] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. New radio (e.g., 5G NR) is an example of an emerging telecommunication standard. NR is a set of enhancements to the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using OFDMA with cyclic prefix (CP) on the downlink (DL) and on the uplink (UL). To these ends, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0006] However, as the demand for mobile broadband access continues to increase, there exists a need for further improvements in NR and LTE technology. Preferably, these improvements should be applicable to other multi-access technologies and the telecommunication standards that employ these technologies. SUMMARY

[0007] The systems, methods, and devices of the disclosure each have several aspects, no single one of which is solely responsible for its desirable attributes. Without limiting the scope of this disclosure as expressed by the claims which follow, some features will now be discussed briefly. The instant disclosure will be described with reference to various apparatus and methods. Herein, the use of “adapted to” or “configured to” shall mean that the component is either explicitly adapted to or configured to, or implicitly adapted to or configured to based on its construction and regular operation. After considering this discussion, and particularly after reading the section entitled “DETAILED DESCRIPTION” one will understand how to implement features of the present disclosure in practice. One will also understand upon such consideration, how features of the present disclosure provide advantages over existing technologies.

[0008] Certain aspects provide a method for wireless communications by a user equipment (UE). The method generally includes determining one or more sidelink discontinuous reception (DRX) configurations or, if enabled, wake-up indication configurations for at least one communication; monitoring for at least one sidelink control information (SCI) after entering a sidelink DRX ON period based on detecting the one or more sidelink DRX configurations or the one or more wake-up indications; receiving the at least one SCI from one or more other UEs during the sidelink DRX ON period for at least one communication; and determining an extension of the sidelink DRX ON period based on whether the at least one SCI schedules at least one first resource for one or more transmissions after the sidelink DRX ON period for at least one communication.

[0009] Certain aspects provide a method for wireless communications by a user equipment (UE). The method generally includes determining one or more sidelink discontinuous reception (DRX) configurations or, if enabled, one or more wake-up indication configurations for at least one communication; determining an extension of a sidelink DRX ON period associated with the one or more sidelink DRX configurations or one or more wake-up indications based on whether at least one SCI schedules at least one first resource for one or more transmissions after the sidelink DRX ON period for at least one communication; and transmitting, if enabled, the wake-up indication prior to the sidelink DRX ON period and transmitting the at least one SCI to at least one other UE during the sidelink DRX ON period for at least one communication.

[0010] Some aspects provide a method for wireless communication by a UE. The method generally includes: determining a configuration associated with a sidelink for at least one communication; monitoring at least one Service Component Interchange (SCI) after entering a sidelink DRX enabling phase based on the configuration; receiving the at least one SCI from one or more other UEs for at least one communication during the sidelink DRX enabling phase; and determining an extension of the sidelink DRX enabling phase based on at least one first resource scheduled for one or more transmissions using the at least one SCI.

[0011] Some aspects provide a method for wireless communication by a UE. The method generally includes: determining a configuration associated with a sidelink for at least one communication; scheduling at least one first resource for one or more transmissions based on at least one SCI; determining an extension of a DRX enable phase for the sidelink associated with the configuration; and transmitting the at least one SCI to at least one other UE for the at least one communication during the sidelink DRX enable phase.

[0012] Other aspects provide: an apparatus operable and configured or otherwise adapted to perform the methods described above and those described elsewhere herein; a non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of the apparatus, cause the apparatus to perform the methods described above and those described elsewhere herein; a computer program product embodied on a computer-readable storage medium, comprising code for performing the methods described above and those described elsewhere herein; and an apparatus comprising units for performing the methods described above and those described elsewhere herein. For example, an apparatus may include a processing system, a device having a processing system, or a processing system cooperating via one or more networks.

[0013] To achieve the foregoing and related objectives, one or more aspects include the features fully described below and specifically pointed out in the claims. The following description and accompanying drawings describe in detail certain exemplary features of one or more aspects. However, these features indicate only a few of the various methods by which the fundamental principles of the aspects can be adopted. Attached Figure Description

[0014] To gain a more detailed understanding of the features of this disclosure, a more specific description of the content briefly outlined above can be obtained by referring to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that, since the description of the invention allows for other equivalent effective aspects, the drawings only illustrate certain typical aspects of this disclosure and are not to be considered as limiting its scope, as the specification may acknowledge other equivalent effective aspects.

[0015] Figure 1 is a block diagram conceptually illustrating an example telecommunications system, in accordance with certain aspects of the present disclosure.

[0016] Figure 2 is a block diagram conceptually illustrating a design of an example base station (BS) and user equipment (UE), in accordance with certain aspects of the present disclosure.

[0017] Figure 3A and Figure 3B shows a diagrammatic representation of an example vehicle-to-anything (V2X) system, in accordance with some aspects of the present disclosure.

[0018] Figure 4 shows an example sidelink discontinuous reception (SL DRX) configuration of a UE in some aspects.

[0019] Figure 5 is a flow chart illustrating example operations for wireless communication, in accordance with certain aspects of the present disclosure.

[0020] Figure 6 is a flow chart illustrating example operations for wireless communication, in accordance with certain aspects of the present disclosure.

[0021] Figure 7A 、 Figure 7B and Figure 7C shows an implementation of SL DRX with inactivity timer implementation, in accordance with certain aspects of the present disclosure.

[0022] Figures 8A-8F shows an implementation of SL DRX in various (re)transmission schemes, in accordance with certain aspects of the present disclosure.

[0023] Figure 9 shows a communications device that can include various components configured to perform operations for the techniques disclosed herein.

[0024] Figure 10 shows a communications device that can include various components configured to perform operations for the techniques disclosed herein.

[0025] To facilitate an understanding of this description, like reference characters are used throughout the disclosure to denote like elements. It should be appreciated that elements disclosed in one aspect can be employed in other aspects, without specific recitation. DETAILED DESCRIPTION

[0026] Aspects of the disclosure provide apparatuses, methods, processing systems, and computer readable media for sidelink (SL) discontinuous reception (DRX). For example, certain aspects provide techniques for extending a SL DRX on-duration associated with a SL DRX configuration to facilitate retransmission in or monitoring for transmissions in a reselection resource. In other words, sidelink control information (SCI) from a transmitting (Tx) UE during a DRX on-duration can indicate resources for retransmission after the DRX on-duration. In response, a receiving (Rx) UE can extend the DRX on-duration to receive the retransmission.

[0027] In some implementations, resources reserved for transmissions during a DRX on-duration can be reselected by the Tx UE to other resources. Accordingly, the Rx UE can remain active to monitor for transmissions using the reselected resources. To reduce power consumption, the Tx UE can explicitly or implicitly transmit a resource reselection indication (RRI) or preemption indication (PI) to the Rx UE indicating whether the resources reserved for transmissions or retransmissions have been reselected or preempted. Accordingly, if the Rx UE receives such a RRI or PI, the Rx UE can enter an inactive state and forego remaining active to monitor for the transmissions or retransmissions that are reselected or preempted, thereby reducing power consumption at the Rx UE, as described in greater detail herein.

[0028] The following description provides examples of configurations for sidelink (SL) communications in a communication system and is not limiting of the scope, applicability, or examples set forth in the claims. Changes can be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples can omit, substitute, or add various procedures or components as appropriate. For instance, the methods described can be performed in an order different from that described, and various steps can be added, omitted, or combined. Also, features described with respect to some examples can be combined in other examples. For example, an apparatus or a method can be implemented using any number of the aspects set forth herein. Also, the scope of the disclosure is intended to cover devices, methods, and articles of manufacture made by the processes described herein. It will be understood that any of the disclosures provided herein can be embodied in one or more elements of a claim. The words comprise, including, and containing mean "including, but not limited to." The words "example" and "exemplary" are used herein to mean "serving as an example, instance, or illustration," and not necessarily "preferred" over other aspects. Unless otherwise indicated, the word "coupled" is intended to mean the direct or indirect joining of two members, for example, by a bond or by other means that are not necessarily mutually exclusive. By way of non-limiting example, an element or component that is "coupled" can be directly or indirectly joined by a bond or by other means, and can or can not be in physical contact with the joining member. As used herein, "plurality" means two or more.

[0029] Typically, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific Radio Access Technology (RAT) or operate on one or more frequencies. A RAT can also be referred to as a radio technology, air interface, etc. A frequency can also be referred to as a carrier, subcarrier, frequency channel, tone, subband, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks using different RATs. In some cases, 5G NR RAT networks can be deployed.

[0030] Figure 1 An example wireless communication network 100 is shown in which aspects of this disclosure may be implemented. For example, the wireless communication network 100 may be an NR system (e.g., a 5G NR network).

[0031] like Figure 1 As shown, the wireless communication network 100 may include multiple base stations (BSs) 110a-z (each base station is also individually referred to herein as BS 110 or collectively as BS 110) and other network entities. BS 110 may provide communication coverage for a specific geographic area (sometimes referred to as a “cell”), which may be stationary or mobile depending on the location of the moving BS 110. In some examples, BS 110 may be interconnected with each other and / or with one or more other BSs or network nodes (not shown) in the wireless communication network 100 using any suitable transport network via various types of backhaul interfaces (e.g., direct physical connection, wireless connection, virtual network, etc.). Figure 1 In the example shown, BS 110a, 110b, and 110c can be macro BSs for macro cells 102a, 102b, and 102c, respectively. BS 110x can be a pico BS for pico cell 102x. BS 110y and 110z can be femto BSs for femto cells 102y and 102z, respectively. A BS can support one or more cells. BS 110 communicates with user equipment (UEs) 120a-y (each base station is also individually referred to herein as UE 120 or collectively as UE 120) in the wireless communication network 100. UE 120 (e.g., 120x, 120y, etc.) can be distributed throughout the wireless communication network 100, and each UE 120 can be stationary or mobile.

[0032] Depending on certain aspects, UE 120 can be configured to manage side-links in Discontinuous Receive (DRX) operating mode. For example... Figure 1As shown, UE 120a includes a DRX manager 122. In some cases, UE 120a may be an Rx UE. In this case, the DRX manager 122 may be configured to extend the sidelink DRX during which transmissions can be received, as described in more detail herein. In some cases, UE 120a may be a Tx UE. In this case, the Tx UE may determine the extension of the sidelink DRX during which transmissions can be sent.

[0033] The wireless communication network 100 may also include a relay station (e.g., relay station 110r) (also referred to as a repeater, etc.) that receives data and / or other information transmissions from an upstream station (e.g., BS 110a or UE 120r) and sends data and / or other information transmissions to a downstream station (e.g., UE 120 or BS 110), or relays transmissions between multiple UEs 120 to facilitate communication between multiple devices.

[0034] Network controller 130 can be coupled to a group of BSs 110 and provide coordination and control for these BSs 110. Network controller 130 can communicate with BSs 110 via backhaul. BSs 110 can also communicate with each other via wireless or wired backhaul (e.g., directly or indirectly).

[0035] Figure 2 It is shown (for example, in) Figure 1 Example components of BS 110a and UE 120a in the wireless communication network 100, which can be used to implement various aspects of this disclosure.

[0036] At the BS 110a, a transmit processor 220 can receive data from a data source 212 and control information from a controller / processor 240. The control information can be for the physical broadcast channel (PBCH), physical downlink control channel (PDCCH), group common PDCCH (GC PDCCH), etc. The data can be for the physical downlink shared channel (PDSCH), etc. The processor 220 can process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. The transmit processor 220 can also generate reference symbols, such as for the primary synchronization signal (PSS) and secondary synchronization signal (SSS). A transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and / or the reference symbols, if applicable, and can provide output symbol streams to the modulators (MODs) 232a-232t. Each modulator 232 can process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator can further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. Downlink signals from modulators 232a-232t can be transmitted via the antennas 234a-234t, respectively.

[0037] At the UE 120a, the antennas 252a-252r can receive the downlink signals from the BS 110a and can provide received signals to the demodulators (DEMODs) 254a-254r, respectively, in transceivers. Each demodulator 254 can condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator can further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 can obtain received symbols from all the demodulators 254a-254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 258 can process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120a to a data sink 260, and provide decoded control information to a controller / processor 280.

[0038] On the uplink at UE 120a, a transmit processor 264 can receive and process data (e.g., for the physical uplink shared channel (PUSCH)) from a data source 262 and control information (e.g., for the physical uplink control channel (PUCCH)) from the controller / processor 280. The transmit processor 264 can also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS)). The symbols from the transmit processor 264 can be precoded by a TX MIMO processor 266 if applicable, further processed by the modulators 254a-254r (e.g., for SC-FDM, cyclic prefix (CP)-OFDM, etc.) in the transceivers, and transmitted to the BS 110a. At the BS 110a, the uplink signals from the UE 120a can be received by the antennas 234, processed by the demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 120a. The receive processor 238 can provide the decoded data to a data sink 239 and the decoded control information to the controller / processor 240.

[0039] The memory 242 and 282 can store data and program codes for the BS 110a and the UE 120a, respectively. A scheduler 244 can schedule UEs for data transmission on the downlink and / or uplink.

[0040] The controller / processor 280 and / or other processors and modules at the UE 120a can perform or direct the execution of processes for the techniques described herein. As Figure 2 shown, the controller / processor 280 of the UE 120a has a DRX manager 122. Although shown at the controller / processor, other components of the UE 120a can be used to perform the operations described herein.

[0041] Figure 3A And Figure 3B A diagrammatic representation of an example vehicle-to-everything (V2X) system is shown in accordance with some aspects of the disclosure. For example, the UE shown in Figure 3A And Figure 3B The UEs shown in FIGS. 1-3 can communicate via sidelink channels and can perform sidelink CSI reporting as described herein.

[0042] The V2X system provided in Figure 3A And Figure 3B provides two complementary transmission modes. The first transmission mode (in Figure 3AThe first transmission mode (illustrated in FIG. 1) involves direct communication between participants in close proximity to each other in a local area (e.g., also referred to as sidelink communication). The second transmission mode (illustrated in Figure 3B

[0043] Referring to Figure 3A , a V2X system 300 (e.g., including vehicle-to-vehicle (V2V) communication) is shown with two UEs 302, 304 (e.g., vehicles). The first transmission mode allows for direct communication between different participants in a given geographic location. As shown, a vehicle can have a wireless communication link 306 with a person (V2P) (e.g., via a UE) over a PC5 interface. Communication between UEs 302 and 304 can also occur over a PC5 interface 308. In a similar manner, communication from UE 302 to other highway components (e.g., a roadside unit (RSU) 311) can occur through a PC5 interface 312, such as a traffic signal or sign (V2I). With respect to each of the communication links shown in Figure 3A

[0044] Figure 3B ​​A V2X system 350 is shown for communication between a UE 352 (e.g., vehicle) and a UE 354 (e.g., vehicle) through a network entity 356. These network communications can occur through a discrete node, such as a base station (e.g., eNB or gNB), that transmits information to and receives information from the UEs 352, 354 (e.g., relays information between the UEs 352, 354). For example, network communications over a vehicle-to-network (V2N) link (e.g., Uu links 358 and 310) can be used for long-range communications between vehicles, such as for communicating the presence of a traffic accident a distance ahead along a road or highway. The node can transmit other types of communications to the vehicles, such as traffic flow conditions, road hazard warnings, environmental / weather reports, and service station availability, among other examples. Such data can be obtained from a cloud-based sharing service.

[0045] In some cases, two or more subordinate entities (e.g., UEs) can communicate with each other using sidelink signals. As described above, V2V and V2X communications are examples of communications that can be transmitted via sidelink. Other applications of sidelink communications can include public safety or service announcement communications, communications for proximity-based services, communications for UE-to-network relaying, device-to-device (D2D) communications, Internet of Everything (IoE) communications, Internet of Things (IoT) communications, mission-critical mesh communications, among other examples. Generally, a sidelink can refer to a direct link between one subordinate entity (e.g., UE1) and another subordinate entity (e.g., UE2). In this way, the sidelink can be used to transmit and receive communications (also referred to herein as “sidelink signals”) without the need for a scheduling entity (e.g., a BS) to relay the communications, although the scheduling entity can be used for scheduling or control purposes. In some examples, the sidelink signals can be communicated using a licensed spectrum (unlike wireless local area networks, which typically use an unlicensed spectrum).

[0046] Various sidelink channels can be used for sidelink communications, including a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), and a physical sidelink feedback channel (PSFCH). The PSSCH can carry discovery expressions that enable nearby devices to discover each other. The PSCCH can carry control signaling, such as sidelink resource configuration and other parameters for data transmission, and the PSSCH can carry data transmissions. The PSFCH can carry feedback, such as an acknowledgement (ACK) or negative acknowledgement (NACK) for hybrid automatic repeat request (HARQ) feedback. The PSSCH can be used to carry channel state information (CSI) related to sidelink channel quality.

[0047] Discontinuous reception (DRX) on sidelink

[0048] In a discontinuous reception (DRX) mode of operation, a UE can enter a low power ("sleep") mode (also referred to herein as a "sleep phase") (which can also be referred to as a low power state) for a certain period of time (referred to as a DRX off phase or duration), and wake up again during a DRX on (e.g., wake-up phase) duration (also referred to as a DRX on phase) to check whether there is any data to receive. The cycle of sleep and wake-up (DRX on and DRX off) durations repeats over time, allowing the UE to save power while remaining in communication.

[0049] Currently, DRX is not defined for sidelink operation, and therefore, a receiver (Rx) UE must monitor for sidelink control information (SCI) in every slot, resulting in high power consumption, which is particularly disadvantageous for battery power limited UEs, such as pedestrian UEs for vehicle-to-pedestrian (V2P) services on sidelink or UEs for public safety services on sidelink. Therefore, there is a need for SL DRX design to save power for sidelink communications. Sidelink communications between different UEs are more diverse compared to communications between a UE and a base station (BS) on a Uu interface. For example, a UE can simultaneously participate in different vehicle-to-everything (V2X) services with different quality of service (QoS) requirements (e.g., reliability, latency, etc.) and different communication types (e.g., broadcast, groupcast, and unicast). Therefore, a generic SL DRX design can not be optimal for both saving power and meeting different QoS requirements.

[0050] Figure 4An example SL DRX configuration 400 for a UE is shown. As shown, the SL DRX configuration 400 can include SL DRX on phases 402, 404. As described herein, the SL DRX on phases are repeated at each SL DRX cycle. For example, as shown, the SL DRX on phase 402 is during a SL DRX cycle 406. A transmitter (Tx) UE wakes up during the SL DRX on phases 402, 404 to communicate with other Rx UEs for unicast or to communicate with Rx UEs for broadcast and groupcast (e.g., the Rx UEs monitor for signaling that can be received from the Tx UE), and both the Tx UE and the Rx UEs are in a low power state (e.g., sleep phase) at other times (also referred to as SL DRX sleep phases). Further, when one of the UEs in a service, group, or UE pair has a packet to transmit on the sidelink to the other UEs in the service or group or to the other UE in the UE pair, that UE becomes the Tx UE on the sidelink. Thus, unlike DRX for a UE to monitor for downlink control information (DCI) from a base station at a Uu interface, SL DRX is bidirectional on the sidelink for both the Tx UE and the Rx UEs, and thus SL DRX forms a sidelink traffic pattern for the service, group, or UE pair.

[0051] Example SL DRX operation

[0052] As described herein, sidelink discontinuous reception (SL DRX) can be formed to assist a Rx UE for unicast, broadcast, or groupcast to determine when to monitor for sidelink control information (SCI) from a Tx UE that schedules sidelink transmissions to the Rx UE. Thus, SL DRX allows the Rx UE to save power by discontinuously monitoring for the SCI. As described herein, SL DRX is bidirectional and also forms a traffic pattern for the Tx UE. In other words, when the Rx UE is not in a SL DRX on state for monitoring for the SCI, the Tx UE can not transmit. In other words, if the Rx UE is not in a DRX on phase, the Rx UE can be in a sleep mode of operation and can not monitor for the SCI. Thus, the Tx UE can also forego transmissions to other UEs that are not in a DRX on phase.

[0053] If different SL DRXs are formed for different communication types, UEs participating in different sidelink communication types can wake up to monitor for SCI within each sidelink DRX on phase based on one or more DL DRX configurations or based on one or more wake-up indications detected prior to the SL DRX on phase. These communication types can include: communications among all UEs with an application or service using broadcast, communications among UEs within a group using groupcast, and / or communications between pairs of UEs using unicast. Thus, a Rx UE can monitor for SCI from one or more Tx UEs for one or more communications of an application or service, a group, or a pair of UEs within each sidelink DRX on phase based on one or more DL DRX configurations or based on one or more wake-up indications detected prior to the SL DRX on phase. For example, multiple Tx UEs can transmit data for a public safety service to other UEs in a broadcast or transmit data for a meeting within a group in a groupcast within a SL DRX on phase. As another example, UEs in a group (e.g., a platoon) can transmit unicast to each other, groupcast to other UEs in the group, and broadcast to nearby UEs within a SL DRX on phase.

[0054] Sidelink scheduling carried on SCI from a transmitting (Tx) UE on a sidelink differs in several aspects compared to downlink and uplink scheduling carried on downlink control information (DCI) transmitted from a base station on a Uu interface. For example, there can be no time gap between scheduling SCI (e.g., first stage SCI) and a data packet carried on a physical sidelink shared channel (PSSCH) associated with the scheduling SCI. In contrast, there can be a time gap between a DCI and a data transmission (e.g., uplink or downlink) scheduled by the DCI. For example, while a DCI can be within a DRX on phase, a scheduled transmission carried on a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH) can be after the DRX on phase. However, for a sidelink, upon receiving a SCI, a transmission including data in a PSSCH associated with the SCI is received together. Further, a scheduling SCI can contain up to 3 resources for transmission and / or retransmission. A scheduling SCI can reserve resources for transmitting or retransmitting data packets of periodic or aperiodic traffic. Based on the above differences, certain aspects of the present disclosure provide techniques for configuring a SL DRX on phase in a manner that reduces power consumption of a UE. For example, certain aspects provide techniques for extending a SL DRX on phase for a single transmission and improving power saving based on resources reserved for retransmission.

[0055] Figure 5is a flow chart illustrating example operations 500 for wireless communication, in accordance with certain aspects of the present disclosure. The operations 500 can be performed, for example, by a UE, such as a Rx UE (e.g., a UE 120a in the wireless communication network 100, or a UE 120t outside of the wireless communication network 100). A Rx UE generally refers to a UE that is receiving during a DRX ON phase.

[0056] The operations 500 can be implemented as software components that are executed / run on a controller / processor (e.g., controller / processor 280 of the Figure 2 ). Furthermore, transmission and / or reception of signals by the UE in operations 500 can be enabled, for example, via one or more antennas (e.g., antennas 252 of the Figure 2 ). In certain aspects, the transmission and / or reception of signals by the UE can be implemented via a bus interface of the one or more processors (e.g., controller / processor 280) obtaining and / or outputting signals.

[0057] At block 505, the operations 500 can begin with the UE determining a configuration (e.g., one or more sidelink DRX configurations and / or, in the case of enablement, a wake-up indication configuration) associated with a sidelink for at least one communication. At block 510, the UE monitors for at least one SCI after entering a sidelink DRX ON phase based on the configuration. At block 515, the UE receives, from one or more other UEs, at least one SCI for at least one communication during the sidelink DRX ON phase. For example, the at least one SCI can schedule one or more transmissions spanning multiple slots, where at least one of the multiple slots is located during the sidelink DRX ON phase for the one or more communications. At block 520, the UE determines an extension of the sidelink DRX ON phase based on the at least one SCI scheduling at least one first resource for the one or more transmissions. For example, the UE can determine to remain in an active state based on the at least one SCI scheduling the at least one first resource for the one or more transmissions (e.g., based on whether the at least one first resource is located after the sidelink DRX ON phase). In some cases, the UE receives the one or more transmissions during the extension of the sidelink DRX ON phase.

[0058] Figure 6 is a flow chart illustrating example operations 600 for wireless communication, in accordance with certain aspects of the present disclosure. The operations 600 can be understood as complementary to the operations 500 of Figure 5 . The operations 600 can be performed, for example, by a UE, such as a Tx UE (e.g., a UE 120a in the wireless communication network 100, or a UE 120t outside of the wireless communication network 200). A Tx UE generally refers to a UE that is transmitting during a DRX ON phase.

[0059] Operation 600 can be implemented in one or more processors (e.g., Figure 2 Software components that execute and run on the controller / processor 280. Furthermore, they can be transmitted, for example, via one or more antennas (e.g., Figure 2 The UE transmits and receives signals in operation 600 via an antenna 252. In some aspects, the UE can transmit and / or receive signals via a bus interface that acquires and / or outputs signals from one or more processors (e.g., controller / processor 280).

[0060] At block 605, operation 600 may begin as follows: The UE determines a configuration associated with a sidelink for at least one communication (e.g., one or more sidelink DRX configurations and / or one or more wake-up indication configurations in an enabled state). At block 610, the UE determines an extension of the sidelink DRX enable phase associated with the configuration based on whether at least one SCI schedules at least one first resource for one or more transmissions. At block 615, the UE sends at least one SCI to other UEs for at least one communication during the sidelink DRX enable phase. In some cases, the UE also sends a wake-up indication in an enabled state before the sidelink DRX enable phase. The at least one SCI may schedule one or more transmissions spanning multiple time slots, at least one of which is located during the sidelink DRX enable phase.

[0061] Figure 7A , Figure 7B and Figure 7C Implementations of the SL DRX enable phase according to certain aspects of this disclosure are shown in 700A, 700B, and 700C. As described, for side link scheduling, in scheduling SCI (e.g., SCI or first-level SCI, such as...) Figure 7A The SCI1 or SCI2 shown is associated with the physical side link shared channel (PSSCH) for a single transmission (e.g., as shown in the diagram). Figure 7A There may be no time gap between data packets carried on PSSCH 1 or PSSCH 2 as shown. In some aspects of this disclosure, the SL DRX start phase can be extended for aggregated time slot scheduling. In some aspects, since single-time slot-based transmissions can be completed at the end of the SL DRX start phase, the SL DRX start phase may not need to be extended for single-time slot-based scheduling.

[0062] For example, as in Figure 7ASCI1 can be transmitted within PSSCH 1 and SCI2 can be transmitted within PSSCH 2, as shown in implementation 700A. For slot-based scheduling, as shown in Figure 7A the SL DRX on-duration phase can not be extended (e.g., across N slots). For example, the SL inactivity timer can be set to a value of 0 at the first slot after the slot in which the single-slot based scheduling SCI is received. The SL inactivity timer generally refers to a timer that can be set by the UE to extend the SL DRX on-duration phase to remain in an active state. After receiving the aggregated-slot based scheduling SCI, the SL inactivity timer can be set to a duration of one or more slots based on the aggregated-slot scheduling. The UE can remain active until the SL inactivity timer expires (e.g., the UE becomes inactive upon expiration of the SL inactivity timer). Thus, for slot-based scheduling as shown in Figure 7A if the PSSCHs (e.g., PSSCH 1 and PSSCH 2) are single transmissions without retransmission with HARQ feedback or blind retransmission (e.g., retransmission without feedback) as indicated by the scheduling SCI, and no other SCI is detected for extending the active state according to one or more SL DRX configurations or no one or more wake-up indications are detected prior to the SL DRX on-duration phase in the case of (e.g., via configuration) enabled, the Rx UE can enter an inactive state after decoding one or more data packets carried on the PSSCHs to save power.

[0063] Regarding implementation 700B of Figure 7B For aggregated-slot scheduling (e.g., transmissions scheduled across slot boundaries), the SL DRX on-duration phase can be extended by setting the SL inactivity timer value at the first slot after the slot in which the aggregated-slot scheduling SCI is received, according to the resources indicated in the scheduling SCI for the indicated aggregated-slot transmission. In other words, in Figure 7BIn the case shown in FIG. 6, the SL inactivity timer can be set to one slot extension at the first slot after receiving the SCI 2 within the SL DRX on duration for the data packet carried on the PSSCH 2 scheduled by the SCI 2. Thus, the SL DRX on duration for the Rx UE can be extended to longer than N slots, e.g., based on the time resources used by the PSSCH as indicated by the SCI. Further, the Rx UE can enter the inactive state after the SL inactivity timer expires to save power. In this case, the Rx UE can do so after slot N (instead of slot N-1) if the transmission is a single transmission without HARQ feedback based retransmission or blind retransmission (e.g., retransmission without feedback) as indicated by the scheduling SCI (e.g., SCI 2), and if no other SCI for extending the active state is detected according to one or more SL DRX configurations or no wake-up indication in the case of (e.g., via configuration) enabled is detected prior to the SL DRX on duration.

[0064] Since the Rx UE can monitor for SCI from different Tx UEs for communications of an application or service, group or UE pair within the SL DRX on duration, or can monitor for SCI from the same or different Tx UEs for more than one communication of an application or service, group or UE pair, or any combination, the SL inactivity timer can be set according to each SCI detected by the Rx UE within the SL DRX on duration. As Figure 7C As shown in FIG. 7, the SL inactivity timer is first set after decoding a first received SCI (e.g., SCI 1) for a first transmission (e.g., PSSCH 1) (e.g., starting at the first slot after the slot of receiving the first SCI), and is further set or updated after decoding a second received SCI (e.g., SCI 2) for a second transmission (e.g., PSSCH 2) (e.g., starting at the first slot after the slot of receiving the second SCI). The SL inactivity timer can be further set or updated until a last SCI within the SL DRX on duration is decoded (e.g., at the first slot after the slot of receiving the last SCI) or before the SL inactivity timer expires (e.g., during which the UE is considered to be in the active state). In some aspects, the SL inactivity timer is reset for each received SCI while the UE is in the active state (e.g., DRX on, inactivity timer running, or HARQ retransmission timer running).

[0065] Figures 8A-8FImplementations 800A, 800B, 800C, 800D, 800E of SL DRX in various (re)transmission schemes are shown in accordance with certain aspects of the disclosure. As described above, a scheduling SCI can indicate up to 3 resources for transmission and / or retransmission. Certain aspects provide techniques for SL DRX retransmission (e.g., blind retransmission, hybrid automatic repeat request (HARQ) retransmission, or both) to further enhance power saving in SL DRX.

[0066] In some cases, the resources for transmission and / or retransmission (e.g., blind retransmission or HARQ feedback retransmission) can be dropped (e.g., due to channel congestion, priority, preemption, or any other relevant factor), and thus the Tx UE can reselect at a later time. However, without any indication from the Tx UE, the Rx UE can continue to monitor for scheduling SCI for the next transmission or retransmission via the previous SCI reservation in case the reserved resources are dropped.

[0067] In certain cases, within the SL DRX on phase, the Rx UE can monitor SCI from different Tx UEs for communication of one or more applications or services, group or UE pairs, or can monitor SCI from the same or different Tx UEs for communication of more than one application, service, group, UE pair, or any combination, and the RX UE can continue to monitor SCI within the SL DRX on phase until the last SCI if known via one or more SL DRX configurations or one or more wake-up indications if enabled (e.g., via configuration), or continue to monitor SCI throughout the SL DRX on phase.

[0068] As Figure 8AAs shown in implementation 800A, the Rx UE can set the SL inactivity timer or the SL retransmission timer based on whether more SCI from the same or different Tx UE is monitored within the SL DRX on-duration phase and / or whether decoding of the initial transmission (e.g., Init Tx1 on PSSCH 1) is successful (e.g., without the need for retransmission). For example, if the initial transmission is successfully decoded, the Rx UE can not monitor any SCI for retransmission, and the Rx UE can not monitor any SCI for new transmissions from the same or different Tx UE and their associated retransmissions (e.g., according to one or more SL DRX configurations, or according to one or more wake-up indications if enabled (e.g., via configuration)), then the SL inactivity timer or the SL retransmission timer can be set to “0” (e.g., no extension of the current SL DRX on-duration phase), and the Rx UE can subsequently or after the SL DRX on-duration phase ends (e.g., the SL DRX on-duration duration timer expires) switch to a low-power mode if enabled for saving more power (e.g., via configuration or MAC command from the Tx UE). Otherwise, if no extension of the SL DRX on-duration phase is set, the Rx UE can keep monitoring for any SCI from the same or different Tx UE until the SL DRX on-duration phase ends (e.g., the SL DRX on-duration duration timer expires); otherwise, the Rx UE can remain active until the extension of the SL DRX on-duration phase (if extended by SCI detected from the same or different Tx UE) ends (e.g., the active state extended by “SL inactivity timer 1” or “SL retransmission timer 1”). As used herein, the initial transmission generally refers to the first transmission of a data packet or transport block (TB).

[0069] As another example, the Rx UE can set the SL inactivity timer or the SL retransmission timer based on whether more SCI from the same or different Tx UE is monitored and / or a first retransmission reserved by the first SCI (e.g., SCI 1) with the initial transmission. Thus, the Rx UE can set the SL inactivity timer or the SL retransmission timer based on reserved resources as indicated by the first scheduling SCI if they are outside of the SL DRX on-duration phase (as shown) or based on a packet delay budget (PDB) for the data transmission (e.g., a value configured based on the PDB) or a remaining PDB (not shown). Figure 8A Figure 8A ​The SL DRX on-duration can be extended (e.g., as shown in FIG. 6) by the SL inactivity timer or the SL retransmission timer (e.g., shown as “SL inactivity timer 1” or “SL retransmission timer 1”) set according to the time between the initial transmission (e.g., InitTx1 carried on PSSCH 1 during slot 0) and at least the first blind retransmission (e.g., ReTx1 carried on PSSCH 2 during slot N reserved by SCI 1) (where the first blind retransmission is outside the SL DRX on-duration), or based on the PDB or the remaining PDB after the initial transmission (e.g., InitTx1 carried on PSSCH 1 during slot 0). However, if the first blind retransmission is within the SL DRX on-duration, the extension can not be applied, and the Rx UE remains active to monitor the first retransmission as well as any SCI from the same or different Tx UE (if enabled (e.g., via configuration)). If the SL inactivity timer or the SL retransmission timer is set at the first slot after the slot of receiving the first SCI (e.g., SCI 1) to extend the SL DRX on-duration according to the resources reserved by the first SCI for retransmission or according to the remaining PDB of the data to extend the active state to the end of at least the first blind retransmission (e.g., RxTx1 in slot N, facilitating ReTx1 carried on PSSCH 2 for the first blind retransmission of InitTx1 reserved by SCI 1) or the end of the PDB or the remaining PDB of the data, respectively, the Rx UE can remain active during the extension to monitor any resource reselection for at least the first retransmission and / or monitor any SCI from the same or different Tx UE with new transmission and its associated retransmission within the PDB or the remaining PDB. If the first retransmission (e.g., ReTx1 on PSSCH 2) is successfully decoded, the Rx UE can switch to the low power mode upon the expiration of the SL inactivity timer or the SL retransmission timer based on the first retransmission (e.g., at the end of the extension of the SL DRX on-duration) or before the expiration of the SL inactivity timer or the SL retransmission timer based on the PDB or the remaining PDB (if enabled (e.g., via configuration or MAC command) for more power saving).If the first retransmission (e.g., ReTx1 on PSSCH 2) is not successfully decoded, the SL inactivity timer or the SL retransmission timer can be further set or updated (if the SL inactivity timer or the SL retransmission timer is set according to the first retransmission) (e.g., shown as “SL inactivity timer 2” or “SL retransmission timer 2”) until the end of the second retransmission (e.g., ReTx2 on PSSCH 3) (as indicated by the first SCI (e.g., SCI1) together with the initial transmission or the second SCI (e.g., SCI2) together with the first retransmission) or can be set to the end of the PDB or the remaining PDB of the data, respectively. The Rx UE can continue to remain active during this extension to monitor any resource reselection for the second retransmission and / or to monitor any SCI from the same or different Tx UE with new transmissions and their associated retransmissions.

[0070] In addition, the Rx UE can remain in the active state in order to check for any possible resource reselection for the first blind retransmission (e.g., ReTx1 carried on PSSCH 2 reserved by SCI 1) and rescheduled by the third SCI (e.g., ReTx3 carried on PSSCH 4 rescheduled by SCI 4), where the detected third SCI for retransmission before the reserved first retransmission can implicitly indicate that the resource reselection before the first blind retransmission (e.g., ReTx1 on PSSCH 2 reserved by SCI 1) originally reserved by the first SCI (e.g., during the active state extended by the SL inactivity timer or the SL retransmission timer) is due to the third SCI preemption or dropping or any new transmission and its associated retransmissions from the same or different Tx UE (e.g., InitTx2 carried on PSSCH 4 as scheduled by SCI 4). Additionally, if the Rx UE does receive the third scheduling SCI (e.g., SCI 4) before the first retransmission (e.g., ReTx1 on PSSCH 2) originally reserved by the first SCI, the UE can reset or update the SL inactivity timer or the SL retransmission timer (e.g., shown as “SL inactivity timer 3” or “SL retransmission timer 3”) at the first slot after the slot of receiving the third scheduling SCI (e.g., SCI 4) based on the resource as indicated by the newly received third scheduling SCI (e.g., SCI 4) and / or the remaining PDB for the data transmission.

[0071] As in Figure 8BAs shown in implementation 800B, the Rx UE can remain in active state in order to check for any possible resource reselection for the first blind retransmission originally reserved by the first SCI (e.g., ReTx1 carried on PSSCH 2 reserved by SCI 1) and rescheduled by the fourth SCI (e.g., ReTx4 carried on PSSCH 4 rescheduled by SCI 4) or any new transmission from the same or different Tx UE and its associated retransmission by the fourth SCI (e.g., InitTx2 carried on PSSCH 4 scheduled by SCI 4) after no detection of the first blind retransmission originally reserved by the first SCI (e.g., ReTx1 carried on PSSCH 2 reserved by SCI 1). If no first retransmission is detected (e.g., no SCI 2 or its associated ReTx1 on PSSCH 2 is detected), then: if the SL inactivity timer or the SL retransmission timer is set based on the resource (if any) for the second retransmission (e.g., ReTx2 on PSSCH 3) as indicated by the first scheduling SCI (e.g., SCI 1), the Rx UE can remain active by resetting or updating the SL inactivity timer or the SL retransmission timer (e.g., shown as “SL inactivity timer 2” or “SL retransmission timer 2”) at the first slot after the slot originally reserved for the retransmission; or if the SL inactivity timer or the SL retransmission timer is set based on the remaining PDB for data transmission, the Rx UE can remain active to monitor for resource reselection for the first retransmission or resource selection for any new transmission from the same or different Tx UE and its associated retransmission. During the extension after the failure to detect the first retransmission originally reserved by the first SCI (e.g., ReTx1 on PSSCH 2), if the Rx UE does receive the fourth scheduling SCI (e.g., SCI 4) before the second retransmission originally reserved by the first SCI (e.g., ReTx2 on PSSCH 3), the UE can reset or update the SL inactivity timer or the SL retransmission timer (e.g., shown as “SL inactivity timer 3” or “SL retransmission timer 3”) at the first slot after the slot of receiving the fourth scheduling SCI (e.g., SCI 4) based on the resource as indicated by the newly received fourth scheduling SCI (e.g., SCI 4) and / or based on the PDB or the remaining PDB for data transmission, where the fourth scheduling SCI can indicate resource reselection for the first retransmission (e.g., RxTx4 on PSSCH 4) or resource selection for a new transmission from the same or different Tx UE and its associated retransmission.Otherwise, if no fourth SCI is detected for resource reselection, for retransmission or for resource selection for a new transmission, the Rx UE can remain active for a time based on the reserved resources or based on an extension of the PDB or remaining PDB for data transmission (e.g., “SL inactivity timer 2” or “SL retransmission timer 2”) to detect the second retransmission (e.g., ReTx2 on PSSCH 3) originally reserved by the first SCI.

[0072] As in Figure 8CIf more SCI and / or the first HARQ feedback resource (e.g., shown as NACK) from the same or different Tx UE is monitored, the Rx UE can set the SL inactivity timer or the SL retransmission timer, as shown in implementation 800C. For example, if the initial transmission is successfully decoded and the HARQ feedback resource is within the SL DRX on-duration, the Rx UE can not monitor any SCI for retransmission, and the Rx UE can not monitor any SCI for new transmission and its associated retransmission from the same or different Tx UE (e.g., according to one or more SL DRX configurations, or according to one or more wake-up indications if enabled (e.g., via configuration)), the SL inactivity timer or the SL retransmission timer can be set to “0” (e.g., no extension of the current SL DRX on-duration), the Rx UE can switch to a low-power mode after sending the ACK if the low-power mode is enabled (e.g., via configuration or MAC command from the Tx UE) for saving more power. Otherwise, if no extension of the SL DRX on-duration is set, the RX UE can stay active and continue to monitor the SCI from the same or other TX UE until the end of the SL DRX on-duration (e.g., the SL DRX on-duration duration timer expires); otherwise, the Rx UE can stay active until the extension of the SL DRX on-duration if another SCI is detected from the same or different Tx UE. As another example, if the HARQ feedback resource is allocated outside of the SL DRX on-duration, the SL inactivity timer or the SL retransmission timer (e.g., “SL inactivity timer 1” or “SL retransmission timer 1”) can be set after the slot of receiving the first SCI (e.g., SCI1) according to the HARQ feedback resource allocation, e.g., extending the SL DRX on-duration until at least after the slot of scheduling the sending of at least the first retransmission (e.g., ReTx 1). The Rx UE can also stay active until at least the extension for the ACK or NACK if enabled for saving more power. The Rx UE can continue to monitor the SCI from the same or different Tx UE after switching to send the ACK or NACK if enabled (e.g., via configuration). Thus, after the Rx UE switches to send the ACK or NACK (e.g., NACK in slot N), the SL inactivity timer or the SL retransmission timer (e.g., “SL inactivity timer 3” or “SL retransmission timer 3”) can be further reset or updated according to the newly detected SCI from the same or different Tx UE. In this case, the Rx UE can stay active after sending the ACK or NACK during the extended active state.In case a NACK is sent (e.g., in slot N) (e.g., HARQ retransmission is needed), a first retransmission (e.g., ReTx1 on PSSCH 2) can be further reset or updated at a first slot after the slot for the reserved first retransmission (e.g., at slot 2N-1) according to a first SCI (e.g., SCI 1) reserved with the initial transmission (e.g., InitTx1 on PSSCH 1) (e.g., “SL Inactivity Timer 2” or “SL Retransmission Timer 2”). The Rx UE can also monitor for any SCI from the same or different Tx UE during this extension if enabled.

[0073] As another example, the Rx UE can set the SL inactivity timer or the SL retransmission timer based on whether to monitor more SCI from the same or different Tx UE and / or a first retransmission (e.g., ReTx1 on PSSCH 2) of the initial transmission (e.g., Init Tx1 on PSSCH 1) (and assuming a retransmission is needed) or based on the PDB or remaining PDB (e.g., a configured value) for the data transmission. If the initial transmission is successfully decoded and no other SCI from the same or different Tx UE needs to be monitored, the Rx UE can switch to a low power mode after sending the ACK within or outside the SL DRX on duration for maximum power saving (if enabled, e.g., via configuration or MAC command from the Tx UE) or, if the ACK is sent within the SL DRX on duration, the Rx UE can switch to a low power mode after the SL DRX on duration expires for power saving (if enabled). If other SCI from the same or different Tx UE needs to be monitored, the Rx UE can continue to monitor the other SCI before the end of the SL DRX on duration (if the ACK is sent within the SL DRX on duration) or before the end of the extension (e.g., if the ACK is sent outside the SL DRX on duration, e.g., “SL inactivity timer 2” or “SL retransmission timer 2” is still running or has not stopped after sending the ACK after the first retransmission ReTx1 using PSSCH 2). As another example, if the initial transmission is not successfully decoded and the SL inactivity timer or the SL retransmission timer (e.g., shown as “SL inactivity timer 1” or “SL retransmission timer 1”) is set according to a time between the initial transmission (e.g., Init Tx1 carried on PSSCH 1 in slot N-1) and at least a first HARQ retransmission (e.g., ReTx1 carried on PSSCH 2 during slot 2N-1, as reserved by SCI 1) (e.g., the SL inactivity timer or the SL retransmission timer is set at a first slot (e.g., slot N) after a slot (e.g., slot N-1) of receiving the first SCI to extend the active state to an end of at least the first HARQ retransmission according to resources reserved by the first SCI for the retransmission or is set according to a PDB or remaining PDB of the data), the Rx UE can switch to send a negative acknowledgement (NACK) after the decoding failure within the SL DRX on duration or within the extension based on the NACK resource allocation (e.g., to send the NACK in slot N within the extension). After sending the NACK, the Rx UE can switch back to continue to monitor any resources reselected for the first HARQ retransmission and / or to continue to monitor any SCI from the same Tx or different Tx UE with a new transmission and its associated retransmission.In other words, the Rx UE can transmit a NACK that indicates to the Tx UE that the initial transmission (e.g., in PSSCH 1) was not successfully received. In response to the NACK, the Tx UE can transmit a first retransmission at the resources reserved by the first SCI (e.g., as shown, in PSSCH 2 for the initial transmission in PSSCH 1) or at resources reselected in the case that the reserved resources are dropped due to channel congestion, priority, pre-emption, or any other factor. If the first retransmission (e.g., ReTx1 on PSSCH 2) is not successfully decoded (e.g., the reserved SCI for the retransmission is not successfully decoded, or the reserved retransmission is not transmitted due to pre-emption or priority drop), the SL inactivity timer or SL retransmission timer (e.g., “SL inactivity timer 2” or “SL retransmission timer 2”) can be further reset or updated until the end of the second reserved HARQ retransmission indicated by the first SCI (e.g., SCI 1) with the initial transmission or the second SCI (e.g., SCI2) with the first HARQ retransmission (not shown in Figure 8C FIG. 2B) or until the end of the PDB or remaining PDB of the data. The Rx UE can continue to remain active during this extension to monitor for any resource reselection for the second HARQ retransmission and / or to monitor for any SCI from the same Tx or different Tx UE with new transmissions and their associated retransmissions.

[0074] Further, the Rx UE can remain in active state to check for the first HARQ retransmission originally reserved by the first SCI (e.g., ReTx1 carried on PSSCH2 reserved by SCI 1) and rescheduled by the third SCI (e.g., ReTx3 carried on PSSCH3 rescheduled by SCI 3), or any possible resources reselected before the first HARQ retransmission originally reserved by the first SCI (e.g., ReTx1 on PSSCH2 reserved by SCI 1) by any new transmission from the same or different Tx UE and its associated retransmission (e.g., InitTx2 carried on PSSCH 3 scheduled by SCI 3) by the third SCI, if any. Further, if the Rx UE does receive the third scheduling SCI (e.g., SCI 3) before the first retransmission originally reserved by the first SCI (e.g., ReTx1 on PSSCH 2), where the third scheduling SCI for retransmission can implicitly indicate resource reselection due to pre-emption or dropping, the UE can reset or update the SL inactivity timer or SL retransmission timer (e.g., shown as “SL inactivity timer 3” or “SL retransmission timer 3”) at the first slot (e.g., slot 2N-1) after the slot in which the third scheduling SCI (e.g., SCI 3) is received based on the resource as indicated by the newly received third scheduling SCI (e.g., SCI 3) for the second HARQ retransmission and / or the PDB or remaining PDB for data transmission.

[0075] As Figure 8CIt is also shown that the Rx UE can remain in active state to reselect any possible resources after failing to detect the first HARQ retransmission originally reserved by the first SCI (e.g., ReTx1 on PSSCH 2 reserved by SCI 1) and a new transmission from the same or different Tx UE by the fourth SCI (e.g., InitTx2 carried on PSSCH 4 by SCI 4) or any new transmission and its associated retransmission by the fourth SCI (e.g., InitTx2 carried on PSSCH 4 by SCI 4) after failing to detect the first HARQ retransmission originally reserved by the first SCI (e.g., ReTx1 on PSSCH 2 reserved by SCI 1) (e.g., the SCI of the first reserved retransmission is not successfully decoded or the first retransmission is dropped due to channel congestion, priority, preemption, or any other factor, if any). If the first retransmission is not detected (e.g., SCI 2 or its associated ReTx1 on PSSCH 2 is not detected), the Rx UE can reset or update the SL inactivity timer or SL retransmission timer (e.g., “SL inactivity timer 2” or “SL retransmission timer 2”) at the first slot (e.g., slot 2N-1) after the slot reserved for the first retransmission based on the resource reserved for the first retransmission (if any) indicated by the first scheduling SCI (e.g., SCI 1) or based on the PDB or remaining PDB for the data transmission. Due to the failed detection of the reserved first retransmission, the Rx UE can optionally switch to send NACK at the resource for the first HARQ retransmission (e.g., ReTx1 on PSSCH 2). The Rx UE can remain active to monitor the resource reselection for the first HARQ retransmission or any new transmission from the same or different Tx UE and its associated retransmission. During the extension after the failed detection of the first HARQ retransmission originally reserved by the first SCI (e.g., ReTx1 on PSSCH 2), if the Rx UE detects the second HARQ retransmission (not shown in FIG. 6) originally reserved by the first SCI (e.g., ReTx2 on PSSCH 3 reserved by SCI 1), the Rx UE can remain in active state to monitor the resource reselection for the second HARQ retransmission or any new transmission from the same or different Tx UE and its associated retransmission. Figure 8CIf a fourth scheduling SCI (e.g., SCI 4) is indeed received prior to the first retransmission (as shown in the diagram), the UE can reset or update the SL inactivity timer or SL retransmission timer (e.g., shown as "SL inactivity timer 4" or "SL retransmission timer 4") based on the resources indicated by the newly received fourth scheduling SCI (e.g., SCI 4) and / or based on the PDB used for data transmission or the remaining PDB. The fourth scheduling SCI can indicate resource reselection for the first retransmission (e.g., RxTx4 on PSSCH 4) or for new transmissions from the same or different Tx UEs and their associated retransmissions. Otherwise, if no fourth SCI is detected for reselection or a new transmission, the Rx UE can remain active to detect a second retransmission (not yet specified) initially reserved by the first SCI within an extended period (e.g., "SL inactivity timer 2" or "SL retransmission timer 2"). Figure 8C (as shown in the image).

[0076] As in Figure 8D As shown in implementation 800D, further power-saving techniques can be provided by the Tx UE implicitly or explicitly sending a Resource Reselection Indication (RRI) or by any UE (including the Tx UE) implicitly or explicitly sending a Preemption Indication (PI). In other words, the TX UE can send an RRI, or any UE can send a PI, to indicate that resources reserved for transmission or retransmission (e.g., ReTx1 in PSSCH2) have been discarded or preempted, and the resources used for transmission or retransmission need to be reselected for another resource (e.g., regarding...). Figure 8A (Implicit indication described). Therefore, if an RRI or PI is received, the Rx UE can decide to skip the initially reserved transmission or retransmission (ReTx1 on PSSCH 2) and skip other SCIs (if enabled) from the same or different Tx UEs for new transmissions and their associated retransmissions, and thus re-enter an inactive state to save more power.

[0077] In other words, such as Figure 8DIf no other SCI for new transmissions and their associated retransmissions from the same or different Tx UEs is monitored, the Rx UE can enter an inactive state between the two transmissions indicated by the scheduling SCI (e.g., the first SCI shown as SCI 1) to further save power, as shown. For example, the SL pause timer can be set according to the time (e.g., the duration for SL pause timer 1) between the initial transmission (e.g., InitTx carried on PSSCH 1 in slot i) and the monitoring occasion for the implicit or explicit RRI or PI for each RRI or PI configuration. The SL pause timer can be a timer set by the UE to pause the active state for the duration of the SL DRX on phase or for the duration of the extension via the SL inactivity timer or the SL retransmission timer (e.g., enter a temporary inactive state or micro-sleep while the SL DRX on duration timer or the SL inactivity timer or the SL retransmission timer (e.g., SL inactivity timer 1 or SL retransmission timer 1 as shown) is still running) until the SL pause timer (e.g., “SL pause timer 1”) expires. The Rx UE can resume the active state for (re)transmissions (e.g., start the SL inactivity timer or the SL retransmission timer) after the SL pause timer (e.g., “SL pause timer 1”) expires. For example, as shown, after the SL pause timer expires (e.g., “SL pause timer 1” expires in slot N-1), the Rx UE resumes the active state to monitor any implicit or explicit RRI or PI from the Tx UE or any UE, respectively, if any, after the SL pause timer expires. If no RRI or PI is detected after the SL pause timer expires, the Rx UE can remain in the active state for the first blind retransmission (e.g., ReTx1 carried on PSSCH 2 reserved by SCI 1). The Rx UE can remain in the active state for the first blind retransmission (e.g., ReTx1 carried on PSSCH 2 reserved by SCI 1) based on the reselected resource (if the reselected resource is used for the retransmission such as Figure 8A ReTx3 in slot N+1, Figure 8B ReTx4 in slot N+2, or Figure 8CSL inactivity timer or SL retransmission timer based on the second blind retransmission (e.g., ReTx2 carried on PSSCH3) as reserved by the first scheduling SCI (e.g., SCI 1), and the Rx UE can remain active to monitor the first retransmission that is rescheduled until the SL inactivity timer or SL retransmission timer expires. This active state suspension procedure can begin with the Rx UE returning to an inactive state after the SL inactivity timer or SL retransmission timer for the originally reserved first retransmission (e.g., ReTx1 on PSSCH2) expires, after which the UE can set another SL suspension timer (e.g., SL suspension timer 2 as shown) and enter an inactive state until the SL suspension timer (e.g., in slot N+2) expires, resume an active state (e.g., reset or start the SL inactivity timer or SL retransmission timer) to monitor for the RRI or PI (e.g., in slot N+2), and monitor for the second retransmission (e.g., ReTx2 in PSSCH3 as shown) if the RRI or PI is not detected, or monitor for the second retransmission that is rescheduled if the RRI or PI is detected.

[0078] As in Figure 8EIf the time gap from the end of decoding the transmission or retransmission to the start of the HARQ feedback transmission is large enough (e.g., time is sufficient to switch from reception to micro-sleep and then from micro-sleep to transmission), the Rx UE can enter an inactive state (e.g., micro-sleep mode) before transmitting the HARQ feedback, and if the time gap from the end of the HARQ feedback transmission to the start of the RRI or PI or retransmission monitoring occasion is large enough (e.g., time is sufficient to switch from transmission to micro-sleep and then from micro-sleep to reception), the Rx UE can also enter an inactive state after the HARQ feedback (e.g., NACK1 as shown) transmission (e.g., at the first symbol or slot after the HARQ feedback). For example, during the SL DRX on phase or during the extension of the SL inactivity timer or SL retransmission timer (e.g., shown as “SL inactivity timer 1” or “SL retransmission timer 1”), the SL pause timer can be set according to the time gap from the end of decoding the initial transmission (e.g., Init Tx on PSSCH 1) to the start of the first HARQ feedback (e.g., NACK1), and / or can be set according to the time gap from the end of the first HARQ feedback (e.g., slot N-1 after “NACK1”) to the start of the first RRI or PI monitoring occasion (e.g., when “SL pause timer 2” expires). The Rx UE can then resume the active state for transmitting HARQ feedback, monitoring RRI or PI, or detecting (re)transmissions after the SL pause timer expires. For example, after the first SL pause timer (e.g., “SL pause timer 1”) expires before the first HARQ feedback, the Rx UE can resume the active state to transmit the first HARQ feedback (e.g., “NACK 1” for retransmission), and / or after the second SL pause timer (e.g., “SL pause timer 2”) expires, the RX UE can resume the active state (e.g., start or reset the SL inactivity timer or SL retransmission timer) to monitor for any RRI or PI or retransmission or transmission (e.g., in slot N-1) from the Tx UE or any other UE. If no RRI or PI is detected, the Rx UE can remain in the active state to monitor for the first HARQ retransmission (e.g., ReTx1 carried on PSSCH 2) reserved by the first scheduling SCI (e.g., by SCI 1), where the SL inactivity timer or SL retransmission timer is reset according to the first HARQ retransmission reserved by the first scheduling SCI.As shown, the SL pause timer can be set again according to a time gap from the end of the first retransmission to the second HARQ feedback (e.g., NACK2 transmission in slot N+1) and / or a time gap from the end of the second HARQ feedback to the retransmission monitoring occasion of the second RRI or PI or the second HARQ retransmission (e.g., ReTx2 carried on PSSCH 2) reserved by the first scheduling SCI (e.g., SCI 1) or the second scheduling SCI (e.g., SCI2) if the second HARQ feedback is NACK.

[0079] As shown in implementation 800F of FIG. 8F, further power saving can also apply to the mixed blind retransmission and HARQ retransmission scenario. For example, the Rx UE can set the SL pause timer according to a time gap between the initial transmission (e.g., InitTx carried on PSSCH1 in slot i) and the retransmission monitoring occasion of the first RRI or PI or the blind retransmission (e.g., ReTx1 carried on PSSCH 2) reserved by the first scheduling SCI (e.g., SCI 1), and can set the SL DRX on phase or via the SL inactivity timer or the SL retransmission timer (e.g., as described in Figure 8F Figure 8F ​The active state for (re)transmission is resumed after expiry of the SL pause timer (e.g., “SL pause timer 1”) (e.g., start or reset “SL inactivity timer 1” or “SL retransmission timer 1”) during the extension period of the first activation of “SL inactivity timer 1” or “SL retransmission timer 1” as shown in the figure. After expiry of the SL pause timer (e.g., “SL pause timer 1”), the Rx UE can transition to the active state (e.g., start or reset SL inactivity timer or SL retransmission timer) to monitor for any RRI or PI or retransmission, and if no RRI or PI is detected, or the first HARQ retransmission is rescheduled with SL inactivity timer or SL retransmission timer reset or updated according to the new scheduling SCI, the Rx UE can use the SL inactivity timer or SL retransmission timer (e.g., “SL inactivity timer 1” or “SL retransmission timer 1”) set according to the initial first HARQ retransmission (e.g., ReTx1 carried on PSSCH 2 indicated by SCI 1) to remain in the active state for the initially reserved first HARQ retransmission. The Rx UE can then extend the active state (e.g., “SL inactivity timer 2” / “retransmission timer 2” as shown in the figure) based on the HARQ feedback for the first retransmission (e.g., ACK in slot N+1) with a micro-sleep (e.g., “SL pause 2”) inserted before the HARQ feedback (e.g., ACK in slot N+1), or the Rx UE can extend the active state (e.g., “SL inactivity timer 3” or “SL retransmission timer 3” as shown in the figure) based on the second retransmission reserved by the first scheduling SCI (SCI 1) or the second scheduling SCI (e.g., SCI2) or a new rescheduling SCI for reselecting resources with a micro-sleep (e.g., “SL pause 2”) inserted before the HARQ feedback (e.g., ACK) and another micro-sleep (e.g., SL pause timer 3) inserted after the ACK feedback to skip RRI or PI monitoring and second retransmission monitoring for more power saving.

[0080] As shown in FIGS. 1-3, the RRI or PI can be explicitly indicated at the monitoring occasion before the transmission or retransmission is dropped or pre-empted. The RRI or PI can also be explicitly or implicitly indicated at the monitoring occasion at or after the start of the dropped or pre-empted transmission or retransmission. For example, if the second SCI (e.g., SCI2 as shown in FIGS. 1-3) carries a different source ID and / or destination ID, the transmission is not a retransmission reserved for the Rx UE or a new SCI detected for retransmission (e.g., SCI2 as shown in FIGS. 1-3). Figure 8D , Figure 8E and Figure 8F As shown in FIGS. 1-3, the RRI or PI can be explicitly indicated at the monitoring occasion before the transmission or retransmission is dropped or pre-empted. The RRI or PI can also be explicitly or implicitly indicated at the monitoring occasion at or after the start of the dropped or pre-empted transmission or retransmission. For example, if the second SCI (e.g., SCI2 as shown in FIGS. 1-3) carries a different source ID and / or destination ID, the transmission is not a retransmission reserved for the Rx UE or a new SCI detected for retransmission (e.g., SCI2 as shown in FIGS. 1-3). Figure 8D , Figure 8E and Figure 8F As shown in FIGS. 1-3, the RRI or PI can be explicitly indicated at the monitoring occasion before the transmission or retransmission is dropped or pre-empted. The RRI or PI can also be explicitly or implicitly indicated at the monitoring occasion at or after the start of the dropped or pre-empted transmission or retransmission. For example, if the second SCI (e.g., SCI2 as shown in FIGS. 1-3) carries a different source ID and / or destination ID, the transmission is not a retransmission reserved for the Rx UE or a new SCI detected for retransmission (e.g., SCI2 as shown in FIGS. 1-3).Figure 8A SCI4, as described for implicit indication, and thus it is an implicit RRI or PI indication. In this case, for a transmission without retransmission or for a transmission with blind retransmission, the SL suspend timer can be set according to the time gap from the end of the transmission or retransmission (e.g., the first slot after the slot in which the SCI of the transmission or retransmission is received) to the start of the next transmission or retransmission (e.g., the first slot for the next transmission or retransmission), or for a transmission with HARQ feedback retransmission, the SL suspend timer can be set according to the time gap from the end of the HARQ feedback transmission (e.g., the first symbol or slot after the HARQ feedback) to the start of the next retransmission, i.e., the Rx UE can remain inactive until the scheduled upcoming retransmission. When the SL suspend timer (e.g., Figure 8E “SL suspend timer 2” or “SL suspend timer 4” in SCI4 expires, the RRI or PI or retransmission monitoring occasion starts.

[0081] For groupcast, there can be two types of HARQ feedback retransmission schemes, e.g., NACK only from at least one Rx UE as Type 1 and ACK or NACK feedback from all Rx UEs as Type 2. For Type 1, the Rx UE can use the above mechanism to extend the active state for NACK only retransmission. For Type 2, the Rx UE can use the above mechanism to skip monitoring the retransmission of the transmission that has been acknowledged by the Rx UE (if enabled for more power saving, e.g., via configuration or MAC command from the Tx UE).

[0082] Figure 9 A communications device 900 is shown, which can include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations shown in Figure 5 The communications device 900 includes a processing system 902 coupled to a transceiver 908. The transceiver 908 is configured to transmit and receive signals for the communications device 900 via an antenna 910, such as the various signals as described herein. The processing system 902 can be configured to perform processing functions for the communications device 900, including processing signals received or to be transmitted by the communications device 900.

[0083] The processing system 902 includes a processor 904 coupled to a computer- readable medium / memory 912 via a bus 906. In certain aspects, the computer-readable medium / memory 912 is configured to store instructions (e.g., computer-executable code) that, when executed by the processor 904, cause the processor 904 to perform aspects of the techniques described herein, such as the operations illustrated in FIG. 8. Figure 5The computer-readable medium / memory 912, in these aspects, stores code 914 for determining, code 916 for monitoring, and code 918 for receiving. In certain aspects, the processor 904 has circuitry configured to implement the code stored in the computer-readable medium / memory 912. The processor 904 includes circuitry 922 for determining, circuitry 924 for monitoring, and circuitry 926 for receiving.

[0084] Figure 10 The communication device 1000 is illustrated as including various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated in FIG. 10. The communication device 1000 includes a processing system 1002 coupled to a transceiver 1008. The transceiver 1008 is configured to transmit and receive signals for the communication device 1000 via an antenna 1010, such as the various signals as described herein. The processing system 1002 can be configured to perform processing functions for the communication device 1000, including processing signals received or to be transmitted by the communication device 1000. Figure 6

[0085] The processing system 1002 includes a processor 1004 coupled to a computer- readable medium / memory 1012 via a bus 1006. In certain aspects, the computer-readable medium / memory 1012 is configured to store instructions (e.g., computer-executable code) that, when executed by the processor 1004, cause the processor 1004 to perform operations as described herein (e.g., with reference to FIG. 10). In certain aspects, the computer-readable medium / memory 1012 is configured to store code 1014 for determining, code 1016 for receiving, and code 1018 for transmitting. In certain aspects, the processor 1004 has circuitry configured to implement the code stored in the computer-readable medium / memory 1012. The processor 1004 includes circuitry 1020 for determining, circuitry 1022 for receiving, and circuitry 1024 for transmitting. Figure 6

[0086] Example Clauses

[0087] Implementations are described in the following numbered clauses:

[0088] ​​Clause 1. A method for wireless communications by a user equipment (UE), comprising: determining a configuration associated with sidelink for at least one communication; monitoring for at least one sidelink control information (SCI) after entering a sidelink DRX on phase based on the configuration; receiving the at least one SCI from one or more other UEs for at least one communication during the sidelink DRX on phase; and determining an extension of the sidelink DRX on phase based on the at least one SCI scheduling at least one resource for one or more transmissions.

[0089] Clause 2. The method of clause 1, wherein the configuration associated with sidelink comprises at least a DRX configuration or a DRX wake-up indication configuration.

[0090] Clause 3. The method of any of clauses 1-2, wherein determining the extension of the sidelink DRX on phase comprises determining to remain in an active state based on the at least one SCI scheduling the at least one resource for the one or more transmissions.

[0091] Clause 4. The method of any of clauses 1-3, further comprising receiving the one or more transmissions during the extension of the sidelink DRX on phase.

[0092] Clause 5. The method of any of clauses 1-4, further comprising: receiving another SCI scheduling the at least one resource for one or more transmissions during the extension of the sidelink DRX on phase; and determining another extension of the sidelink DRX on phase based on the received another SCI.

[0093] Clause 6. The method of any of clauses 1-5, wherein the at least one SCI schedules the one or more transmissions spanning multiple slots, at least one of the multiple slots being during the sidelink DRX on phase.

[0094] Clause 7. The method of any of clauses 1-6, wherein the one or more transmissions scheduled by the at least one SCI comprise at least a retransmission of a first transmission transmitted during the sidelink DRX on phase.

[0095] Clause 8. The method of clause 7, wherein: the method further comprises receiving the first transmission during the sidelink DRX on phase, the first transmission being transmitted with the at least one SCI; and determining the extension of the sidelink DRX on phase comprises determining to extend the sidelink DRX on phase if the first transmission is unsuccessful.

[0096] Clause 9. The method of clause 8, further comprising monitoring for another SCI prior to the reception occasion of the retransmission reserved by the at least one SCI, wherein the other SCI indicates an adjustment to resources allocated for the retransmission reserved by the at least one SCI.

[0097] Clause 10. The method of any one of clauses 8-9, further comprising monitoring for another SCI prior to the reception occasion of the retransmission reserved by the at least one SCI, wherein the other SCI is transmitted with a second transmission, the other SCI indicating resources allocated for retransmission of the second transmission.

[0098] Clause 11. The method of any one of clauses 8-10, further comprising monitoring for another SCI after the reception occasion of the retransmission reserved by the at least one SCI, wherein the other SCI indicates an adjustment to resources allocated for the retransmission reserved by the at least one SCI.

[0099] Clause 12. The method of any one of clauses 8-11, further comprising monitoring for another SCI after the reception occasion of the retransmission reserved by the at least one SCI, wherein the other SCI is transmitted with a second transmission, the other SCI indicating resources allocated for retransmission of the second transmission.

[0100] Clause 13. The method of any one of clauses 1-12, further comprising receiving a first transmission during the sidelink DRX on phase, the first transmission being transmitted with the at least one SCI, and transmitting a feedback signal indicating whether the first transmission was successfully received, the determination of the extension being based on the feedback signal.

[0101] Clause 14. The method of clause 13, wherein the feedback signal is a negative acknowledgement (NACK).

[0102] Clause 15. The method of any one of clauses 13-14, wherein the feedback signal is a positive acknowledgement (ACK).

[0103] Clause 16. The method of any one of clauses 1-15, wherein: the method further comprises receiving a first transmission during the sidelink DRX on phase, the first transmission being transmitted with the at least one SCI, the at least one SCI schedules the at least one resource for a second transmission within or after the sidelink DRX on phase, and the determining to extend the sidelink DRX on phase comprises deciding to remain in an active state at least until an end of the second transmission.

[0104] Clause 17. The method of clause 16, wherein the first transmission comprises an initial transmission.

[0105] Clause 18. The method of clause 17, wherein the second transmission comprises a retransmission of the initial transmission.

[0106] Clause 19. The method of clause 18, wherein the retransmission comprises a blind retransmission, a hybrid automatic repeat request (HARQ) retransmission, or both.

[0107] Clause 20. The method of any one of clauses 16-19, wherein the second transmission comprises different data than the first transmission.

[0108] Clause 21. The method of any one of clauses 1-20, further comprising: receiving a first transmission during the sidelink DRX on phase, the first transmission being transmitted with the at least one SCI; and determining to remain in an active state after receiving the first transmission to monitor for a retransmission or a second transmission of the first transmission.

[0109] Clause 22. The method of any one of clauses 1-21, wherein: the method further comprises: receiving a first transmission during the sidelink DRX on phase, the first transmission being transmitted with the at least one SCI; and determining the extension of the sidelink DRX on phase comprises determining to enter an inactive state after receiving the first transmission; and determining to exit the inactive state to monitor for a retransmission of the first transmission.

[0110] Clause 23. The method of one of clauses 1-22, wherein: the method further comprises: receiving a first transmission during the sidelink DRX on phase, the first transmission being transmitted with the at least one SCI; and determining the extension of the sidelink DRX on phase comprises determining to enter an inactive state after transmitting feedback for the first transmission; and determining to exit the inactive state to monitor for a retransmission of the first transmission.

[0111] Clause 24. The method of clause 23, further comprising: transmitting the feedback, wherein the transmitting of the feedback comprises transmitting a NACK, the NACK indicating an unsuccessful reception of the first transmission.

[0112] Clause 25. The method of any of clauses 23-24, wherein: determining the extension of the sidelink DRX on-duration further comprises determining an extension of the sidelink DRX on-duration based on the at least one SCI scheduling the at least one resource for the retransmission of the first transmission; the method further comprises transmitting a NACK indicating that the first transmission was not successfully received during an extension portion of the sidelink DRX on-duration; and entering the inactive state comprises entering the inactive state at an end of the transmission of the NACK.

[0113] Clause 26. A method for wireless communication by a user equipment (UE), comprising: determining a configuration associated with a sidelink for at least one communication; determining an extension of a sidelink DRX on-duration associated with the configuration based on whether at least one sidelink control information (SCI) schedules at least one resource for one or more transmissions; and transmitting, to at least one other UE, the at least one SCI for at least one communication during the sidelink DRX on-duration.

[0114] Clause 27. The method of clause 26, further comprising transmitting a wake-up indication prior to the sidelink DRX on-duration.

[0115] Clause 28. The method of any of clauses 26-27, wherein the configuration associated with a sidelink comprises at least a DRX configuration or a DRX wake-up indication configuration.

[0116] Clause 29. The method of any of clauses 26-28, wherein determining the extension of the sidelink DRX on-duration comprises determining to remain in an active state based on the at least one SCI scheduling the at least one first resource for the one or more transmissions.

[0117] Clause 30. The method of any of clauses 26-29, further comprising transmitting the one or more transmissions during the extension of the sidelink DRX on-duration.

[0118] Clause 31. The method of clause 30, further comprising: transmitting another SCI scheduling the at least one resource for one or more transmissions during the extension of the sidelink DRX on-duration; and determining another extension of the sidelink DRX on-duration based on the other SCI.

[0119] Clause 32. The method of any of clauses 26-31, wherein the one or more transmissions scheduled by the at least one SCI span multiple slots, at least one of the multiple slots being during the sidelink DRX on-duration.

[0120] Clause 33. The method of any of clauses 26-32, wherein the one or more transmissions scheduled by the at least one SCI include at least a retransmission of a first transmission transmitted during the sidelink DRX on-duration.

[0121] Clause 34. The method of clause 33, wherein: the method further comprises transmitting the first transmission during the sidelink DRX on-duration, the first transmission being transmitted with the at least one SCI; and the determining of the extension of the sidelink DRX on-duration comprises determining to extend the sidelink DRX on-duration if the first transmission is unsuccessful.

[0122] Clause 35. The method of clause 34, further comprising transmitting another SCI prior to the retransmission, wherein the other SCI indicates an adjustment to resources allocated for the retransmission.

[0123] Clause 36. The method of any of clauses 34-25, further comprising transmitting another SCI prior to the retransmission reserved by the at least one SCI, wherein the other SCI is transmitted with a second transmission, the other SCI indicating resources allocated for a retransmission of the second transmission reserved by the at least one SCI.

[0124] Clause 37. The method of any of clauses 34-36, further comprising transmitting another SCI after the retransmission reserved by the at least one SCI, wherein the other SCI indicates an adjustment to resources allocated for the retransmission.

[0125] Clause 38. The method of any of clauses 34-36, further comprising transmitting another SCI after the retransmission reserved by the at least one SCI, wherein the other SCI is transmitted with a second transmission, the other SCI indicating resources allocated for a retransmission of the second transmission.

[0126] Clause 39. The method of any of clauses 26-38, further comprising transmitting a first transmission during the sidelink DRX on-duration, the first transmission being transmitted with the at least one SCI; and receiving a feedback signal indicating whether the first transmission was successfully received, the determining of the extension being based on resources allocated for the feedback signal.

[0127] Clause 40. The method of clause 39, wherein the feedback signal is a negative acknowledgement (NACK).

[0128] Clause 41. The method of any of clauses 39-40, wherein the feedback signal is a positive acknowledgement (ACK).

[0129] Clause 42. The method of any of clauses 26-41, wherein: the method further comprises transmitting a first transmission during the sidelink DRX on phase, the first transmission being transmitted with the at least one SCI; the at least one SCI schedules at least one resource for a second transmission within or after the sidelink DRX on phase; and the determining to extend the sidelink DRX on phase comprises deciding to remain in an active state until an end of the second transmission.

[0130] Clause 43. The method of clause 42, wherein the first transmission comprises an initial transmission.

[0131] Clause 44. The method of clause 43, wherein the second transmission comprises a retransmission of the initial transmission.

[0132] Clause 45. The method of clause 44, wherein the retransmission comprises a blind retransmission, a hybrid automatic repeat request (HARQ) retransmission, or both.

[0133] Clause 46. The method of any of clauses 42-45, wherein the second transmission comprises different data than the first transmission.

[0134] Clause 47. The method of any of clauses 42-46, further comprising receiving a negative acknowledgement (NACK) indicating that the first transmission was not successfully received, the determining to extend the sidelink DRX on phase being due to transmission of the NACK.

[0135] Clause 48. The method of any of clauses 26-47, further comprising transmitting a first transmission during the sidelink DRX on phase, the first transmission being transmitted with the at least one SCI; and determining to remain in an active state to transmit a retransmission of the first transmission or a second transmission after transmitting the first transmission.

[0136] Clause 49. The method of any of clauses 26-48, wherein: the method further comprises: transmitting a first transmission during the sidelink DRX on phase, the first transmission being transmitted with the at least one SCI; and determining the extension of the sidelink DRX on phase comprises: determining to enter an inactive state after transmitting the first transmission; and determining to exit the inactive state to transmit a retransmission of the first transmission.

[0137] Clause 50. The method of one of clauses 26-49, wherein: the method further comprises: transmitting a first transmission during the sidelink DRX on phase, the first transmission being transmitted with the at least one SCI; and determining the extension of the sidelink DRX on phase comprises: determining to enter an inactive state after receiving feedback for the first transmission; and determining to exit the inactive state to transmit a retransmission of the first transmission.

[0138] Clause 51. The method of clause 50, further comprising: receiving the feedback, wherein receiving the feedback comprises receiving a NACK, the NACK indicating that the first transmission was not successfully received.

[0139] Clause 52. The method of any of clauses 50-51, wherein: determining the extension of the sidelink DRX on phase further comprises: determining to extend the sidelink DRX on phase based on the at least one SCI scheduling the at least one resource for the retransmission of the first transmission; the method further comprises: receiving a NACK, the NACK indicating that the first transmission was not successfully received during an extended portion of the sidelink DRX on phase; and entering the inactive state comprises: entering the inactive state at an end of the receiving of the NACK.

[0140] The techniques described herein can be used for various wireless communication technologies, such as NR (e.g., 5G NR), 3GPP Long Term Evolution (LTE), LTE-Advanced (LTE-A), code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single-carrier frequency division multiple access (SC-FDMA), time division synchronous code division multiple access (TD-SCDMA), and other networks. The terms “network” and “system” are often used interchangeably. A CDMA network can implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, and so on. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. cdma2000 covers IS-2000, IS-95, and IS-856 standards. A TDMA network can implement a radio technology such as Global System for Mobile Communications (GSM). An OFDMA network can implement a radio technology such as NR (e.g., 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash- OFDMA, and so on. UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS). LTE and LTE-A are releases of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization named “3rd Generation Partnership Project” (3GPP). cdma2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2). NR is an emerging wireless communications technology.

[0141] The techniques described herein can be used for the wireless networks and radio technologies mentioned above as well as other wireless networks and radio technologies. For clarity, while aspects are presented herein with reference to the 3G, 4G, and / or 5G wireless technology, aspects of the present disclosure can be applied to communications of other generations.

[0142] In 3GPP, depending on the context in which the term is used, the term "cell" can refer to a coverage area of a Node B (NB), and / or a NB subsystem serving the coverage area. In NR systems, the terms "cell" and BS, next generation Node B (gNB or gNodeB), access point (AP), Distributed Unit (DU), carrier, or Transmission Reception Point (TRP) can be interchangeable. A BS can be referred to as a macro BS, a small cell, a femtocell, a pico BS, etc. A macro cell can cover a relatively large geographic area (e.g., several kilometers in radius) and can allow restricted or no access by UEs having certain subscription associated with the macro cell (e.g., UEs with or without a subscription to a service provider associated with the macro cell). A small cell can include a micro cell, a pico cell, or a femto cell, and can cover a relatively small geographic area (e.g., a home) and can allow for restricted access by UEs with an association to the small cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell can be referred to as a macro BS. A BS for a small cell can be referred to as a small cell BS, a micro BS, a pico BS, or a femto BS.

[0143] A UE can also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a Customer Premises Equipment (CPE), a cellular phone, a smart phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, an appliance, a medical device or medical equipment, a biometric sensor / device, a wearable device such as a smartwatch, smart clothing, smart eyewear, smart bracelet, smart jewelry (e.g., smart bracelet, smart necklace, etc.), an entertainment device (e.g., music device, video device, satellite radio, etc.), a vehicular component or sensor, a smart meter / sensor, industrial manufacturing device, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium. Some UEs can be considered machine-type communication (MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., that can communicate with a BS, another device (e.g., remote device), or some other entity. A wireless node can provide, for example, connectivity for or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs can be considered Internet-of-Things (IoT) devices, which can be Narrowband IoT (NB-IoT) devices.

[0144] Certain wireless networks (e.g., LTE) utilize orthogonal frequency division multiplexing (OFDM) on the downlink and single-carrier frequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDM partition the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, or the like. Each subcarrier can be modulated with data. In general, modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM. The spacing of the adjacent subcarriers can be fixed, and the total number of subcarriers (K) can be dependent on the system bandwidth. For example, the spacing of the subcarriers can be 15 kHz and the minimum resource allocation (known as a “resource block” (RB)) can be 12 subcarriers (or 180 kHz). Consequently, for a 1.25, 2.5, 5, 10, or 20 megahertz (MHz) system bandwidth, the nominal fast fourier transform (FFT) size can be equal to 128, 256, 512, 1024, or 2048, respectively. The system bandwidth can also be partitioned into sub-bands. For example, a sub-band can cover 1.8 MHz (e.g., 6 RBs), and there can be 1, 2, 4, 8, or 16 sub-bands for a 1.25, 2.5, 5, 10, or 20 MHz system bandwidth, respectively. In LTE, the basic transmission time interval (TTI) or packet duration is the 1 ms subframe.

[0145] NR can utilize OFDM with a CP on the uplink and downlink and include support for half-duplex operation using TDD. In NR, a subframe is still 1 ms, but the basic TTI is referred to as a slot. One subframe contains a variable number of slots (e.g., 1, 2, 4, 8, 16... slots) depending on the subcarrier spacing. An NR RB is 12 consecutive frequency subcarriers. NR can support a base subcarrier spacing of 15 KHz, and other subcarrier spacings can be defined with respect to the base subcarrier spacing (e.g., 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc.). The symbol and slot lengths scale with the subcarrier spacing. The CP length also depends on the subcarrier spacing. Beamforming can be supported and beam direction can be dynamically configured. MIMO transmissions with precoding can also be supported. In some examples, MIMO configurations in the DL can support up to 8 transmit antennas with up to 8 streams and multi-layer DL transmissions up to 2 streams per UE. In some examples, multi-layer transmissions up to 2 streams per UE can be supported. Aggregation of multiple cells up to 8 serving cells can be supported.

[0146] In some examples, access to the air interface can be scheduled. A scheduling entity (e.g., a BS) allocates resources for communication among some or all of the devices and equipment within its serving area or cell. The scheduling entity can be responsible for scheduling, allocating, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, a subordinate entity utilizes resources allocated by the scheduling entity. A base station is not the only component that can function as a scheduling entity. In some examples, a UE can function as a scheduling entity and can schedule resources for one or more subordinate entities, such as one or more other UEs, and the other UEs can utilize the resources scheduled by the UE. In some examples, a UE can act as a scheduling entity in a peer-to-peer (P2P) network and / or mesh network. In a mesh network example, UEs can communicate directly with one another in addition to communicating with the scheduling entity.

[0147] In some examples, two or more subordinate entities (e.g., UEs) can communicate with each other using sidelink signals. Real-world applications of such sidelink communications can include public safety, proximity services, UE-to-network relaying, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical mesh, and / or various other appropriate applications. Generally, a sidelink signal can refer to a signal communicated from one subordinate entity (e.g., UE1) to another subordinate entity (e.g., UE2) without relaying that communication through the scheduling entity (e.g., a UE or BS), although the scheduling entity can be utilized for scheduling and / or control purposes. In some examples, the sidelink signals can be communicated using a licensed spectrum (unlike wireless local area networks, which typically use an unlicensed spectrum).

[0148] The methods disclosed herein include one or more steps or actions for achieving the methods. The method steps and / or actions can be interchanged with one another without departing from the scope of the claims. In other words, unless a specific order is specified, the order or sequence of any step or action can be modified without departing from the scope of the claims. Also, that the recited order is "one example." Alternatively, even if the order is specified, additional or fewer steps or actions can be employed.

[0149] As used herein, the phrase "at least one of" a list of items refers to any combination of one or more of the items in the list. For example, "at least one of a, b, or c" is intended to cover: a, b, c, a-b, a-c, b-c, and a-b-c, as well as any multiples of the multiples (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c).

[0150] As used herein, the term "determining" encompasses a wide variety of actions. For example, "determining" can include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure), ascertaining and the like. Also, "determining" can include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory) and the like. Also, "determining" can include resolving, selecting, choosing, establishing and the like.

[0151] The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language of the claims, wherein reference to an element in the singular is not intended to mean "one and only one" unless specifically so stated, but rather "one or more." Unless specifically stated otherwise, the term "some" refers to one or more. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or will be known to those of ordinary skill in the art are expressly incorporated herein by reference and intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. No claim element is to be construed as a means plus function unless the element is expressly recited using the phrase "means for."

[0152] The various operations of methods described above can be performed by any suitable means capable of performing the corresponding functions. The means can include various hardware and / or software component(s) and / or module(s), including, but not limited to a circuit, an application specific integrated circuit (ASIC), or processor. Generally, where there are operations illustrated in figures, those operations can have corresponding counterpart means-plus-function components with similar numbering.

[0153] The various illustrative logical blocks, modules, and circuits described in connection with the present disclosure can be implemented or performed with a general-purpose processor, a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor can be a microprocessor, but in the alternative, the processor can be any commercial available processor, controller, microcontroller, or state machine. A processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0154] When implemented in hardware, an example hardware configuration can include a processing system in a wireless node. The processing system can be implemented with a bus architecture. The bus can include any number of interconnecting buses and bridges depending on the specific application of the processing system and the overall design constraints. The bus can link together various circuits including processors, machine-readable media, and buses. A bus interface can be used to connect a network adapter to the processing system via the bus. The network adapter can be utilized to implement signal processing functionality of the PHY layer. In the case of user terminal 120 (see FIG. 1), a user interface (e.g., keypad, display, mouse, joystick, etc.) can also be connected to the bus. The bus can also link various other circuits such as a clock source, peripheral devices, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore will not be described any further. The processor can be implemented with one or more general-purpose processors and / or special purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuits that can execute software. Those skilled in the art will recognize how best to implement the described functionality for the processing system depending on the particular application and the overall design constraints imposed on the overall system. Figure 1

[0155] ​When implemented in software, the functions can be stored or transmitted over as one or more instructions or code on a computer-readable medium. Computer- readable media include both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. The processor can be responsible for managing the bus and general processing, including the execution of software routines stored in machine-readable storage media. The computer-readable storage media can be coupled with the processor such that the processor can read information from, and write information to, the storage media. In alternative embodiments, the storage media can be integral with the processor. The computer-readable storage media can include one or more of volatile memory, non-volatile memory, ROM, PROM, EPROM, EEPROM, flash memory, magnetic or optical cards, disk media, tape media, and the like, for example, as well as any combination thereof. The computer-readable storage media can be embodied in a computer program product. By way of example, a computer program product can include a computer-readable medium in packaging materials.

[0156] Software modules can include single or plural instructions, and can be distributed over several different code segments, distributed among different programs, and across multiple storage media. The computer-readable media can include a number of software modules. The software modules include instructions that, when executed by an apparatus such as a processor, cause the processing system to perform various functions. The software modules can include transmission modules and receiving modules. Each software module can reside in a single storage device or be distributed across multiple storage devices. By way of example, a software module can be loaded into RAM from a hard drive when a triggering event occurs. During execution of the software module, the processor can load some of the instructions into cache to increase access speed. One or more cache lines can then be loaded into a general register file for execution by the processor. When referring to the functionality of a software module below, it will be understood that such functionality is implemented by the processor when executing instructions from that software module.

[0157] Also, any connection is 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, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu-ray® disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Thus, in some aspects computer-readable media can comprise non-transitory computer-readable media (e.g., tangible media). In addition, for other aspects computer-readable media can comprise transitory computer- readable media (e.g., signals). Combinations of the above should also be included within the scope of computer-readable media.

[0158] Thus, certain aspects can comprise a computer program product for performing the operations presented herein. For example, such a computer program product can comprise a computer-readable medium having instructions stored (and / or encoded) thereon, the instructions being executable by one or more processors to

[0159] Further, it should be appreciated that modules and / or other appropriate means for performing the methods and techniques described herein can be downloaded and / or otherwise obtained by a user terminal and / or base station as applicable. For example, such a device can be coupled to a server to facilitate the transfer of means for performing the methods described herein. Alternatively, various methods described herein can be provided via storage means (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc.), such that a user terminal and / or base station can obtain the various methods upon coupling or providing the storage means to the device.

[0160] It is to be understood that the claims are not limited to the precise configuration and components illustrated above. Various modifications, changes, and variations can be made in the arrangement, operation, and details of the methods and apparatus described above without departing from the scope of the claims.​

Claims

1. A method for wireless communication by a user equipment (UE), comprising: Determine the configuration associated with the side link used for at least one communication; After entering the side link discontinuous reception (DRX) enable phase based on the above configuration, at least one side link control information (SCI) is monitored; During the sidelink DRX activation phase, the at least one SCI is received from one or more other UEs for at least one communication; The extension of the DRX activation phase of the side link is determined based on at least one resource scheduled for one or more transmissions using at least one SCI. as well as Monitor another SCI before the reception opportunity of the retransmission reserved by the at least one SCI, wherein the other SCI indicates an adjustment of the resources allocated for the retransmission, and the retransmission includes a retransmission of the first transmission if the first transmission of the one or more transmissions fails.

2. The method according to claim 1, wherein, The configuration associated with the side link includes at least a DRX configuration or a DRX wake-up indication configuration.

3. The method according to claim 1, wherein, Determining the extension of the DRX enable phase for the side link includes: determining to remain active based on the at least one resource scheduled for the one or more transmissions using the at least one SCI.

4. The method according to claim 1, further comprising: During the extended period of the side link DRX activation phase, the one or more transmissions are received.

5. The method according to claim 1, further comprising: During the extended period of the side link DRX activation phase, another SCI of the at least one resource scheduled for one or more transmissions is received; as well as Based on the other SCI, determine another extension of the DRX activation phase for the side link.

6. The method according to claim 1, wherein, The at least one SCI scheduler spans one or more transmissions across multiple time slots, at least one of the multiple time slots being located during the side link DRX enable phase.

7. The method according to claim 1, wherein: The method further includes: receiving the first transmission during the side link DRX activation phase, the first transmission being sent together with the at least one SCI; and Determining the extension of the side link DRX activation phase includes: if the first transmission is unsuccessful, then determining to extend the side link DRX activation phase.

8. The method according to claim 7, further comprising: Monitor another SCI prior to the reception opportunity of the retransmission reserved by the at least one SCI, wherein the other SCI is sent together with the second transmission, and the other SCI indicates the resources allocated for the retransmission of the second transmission.

9. The method according to claim 7, further comprising: After the reception opportunity of the retransmission reserved by the at least one SCI, another SCI is monitored, wherein the other SCI indicates an adjustment to the resources allocated for the retransmission reserved by the at least one SCI.

10. The method of claim 7, further comprising: After the retransmission reception opportunity reserved by the at least one SCI, another SCI is monitored, wherein the other SCI is sent together with the second transmission, and the other SCI indicates the resources allocated for the retransmission of the second transmission.

11. The method according to claim 1, further comprising: The first transmission is received during the side link DRX activation phase, and the first transmission is sent together with the at least one SCI; as well as A feedback signal indicating whether the first transmission was successfully received is sent, and the determination of the extension is based on the feedback signal.

12. The method according to claim 11, wherein, The feedback signal is a negative acknowledgment (NACK).

13. The method according to claim 11, wherein, The feedback signal is a positive acknowledgment (ACK).

14. The method according to claim 1, wherein: The method further includes: receiving the first transmission during the side link DRX activation phase, the first transmission being sent together with the at least one SCI; The at least one SCI is scheduled for the at least one resource of the second transmission within or after the side link DRX activation phase; and The determination to extend the side link DRX activation phase includes: deciding to keep it active at least until the second transmission ends.

15. The method according to claim 14, wherein, The first transmission includes the initial transmission.

16. The method according to claim 15, wherein, The second transmission includes a retransmission of the initial transmission.

17. The method according to claim 16, wherein, The retransmissions include blind retransmissions, Hybrid Automatic Repeat Request (HARQ) retransmissions, or both.

18. The method according to claim 14, wherein, The second transmission includes data that is different from the first transmission.

19. The method according to claim 1, further comprising: A first transmission is received during the side link DRX activation phase, the first transmission being sent together with the at least one SCI; as well as It is determined to remain active after receiving the first transmission in order to monitor for retransmission of the first transmission or a second transmission.

20. The method according to claim 1, wherein: The method further includes: receiving the first transmission during the side link DRX activation phase, the first transmission being sent together with the at least one SCI; and Determining the extension of the DRX activation phase for the side link includes: It is determined that an inactive state is entered after the first transmission is received; and Determine to exit the inactive state in order to monitor retransmission of the first transmission.

21. The method according to claim 1, wherein: The method further includes: receiving the first transmission during the side link DRX activation phase, the first transmission being sent together with the at least one SCI; and Determining the extension of the DRX activation phase for the side link includes: Determine whether to enter an inactive state after sending feedback on the first transmission; and Determine to exit the inactive state to monitor retransmission of the first transmission.

22. The method of claim 21, further comprising: Sending the feedback, wherein sending the feedback includes sending a NACK, the NACK indicating that the first transmission was not successfully received.

23. The method according to claim 21, wherein: Determining the extension of the DRX enabling phase for the side link further includes: determining the extension of the DRX enabling phase for the side link based on the at least one resource scheduled by the at least one SCI for the retransmission of the first transmission; The method further includes: sending a NACK, the NACK indicating that the first transmission was not successfully received during the extended portion of the side link DRX activation phase; and Entering the inactive state includes entering the inactive state at the end of the transmission of the NACK.

24. A method for wireless communication by a user equipment (UE), comprising: Determine the configuration associated with the side link used for at least one communication; The extension of the sidelink discontinuous reception (DRX) enable phase associated with the configuration is determined based on whether at least one sidelink control information (SCI) schedules at least one resource for one or more transmissions of the at least one communication. During the sidelink DRX activation phase, the at least one SCI is sent to at least one other UE for the first transmission of the one or more transmissions; as well as Another SCI is determined before the transmission timing of the retransmission reserved by the at least one SCI, wherein the other SCI indicates an adjustment to the resources allocated for the retransmission, and the retransmission includes a retransmission of the first transmission if the first transmission is unsuccessful.

25. The method according to claim 24, wherein, Determining the extension of the sidelink DRX activation phase includes: determining that the resource remains active based on whether the at least one SCI schedules the at least one resource for the one or more transmissions after the sidelink DRX activation phase.

26. The method of claim 24, further comprising: During the extended period of the side link DRX activation phase, one or more transmissions are sent.

27. An apparatus for wireless communication by a user equipment (UE), comprising: Memory; as well as One or more processors are coupled to the memory, and the memory and the one or more processors are configured to perform the method according to any one of claims 1 to 23.

28. An apparatus for wireless communication by a user equipment (UE), comprising: Memory; as well as One or more processors coupled to the memory, the memory and the one or more processors being configured to perform the method according to any one of claims 24 to 26.

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