Beam training for sidelink (SL) configured with discontinuous reception (DRX)

Abstract

Certain aspects provide a method of wireless communication by a first user equipment (UE). The method generally includes: applying a discontinuous reception (DRX) configuration to the first UE; monitoring first signaling from a second UE indicating that the second UE has data to send to the first UE, the first signaling being transmitted using a plurality of transmit beams during a DRX cycle of the DRX configuration; selecting one or more transmit beams from the plurality of transmit beams based on the monitoring of the first signaling; and communicating in accordance with the selection.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Application No. 17 / 162,784, filed on January 29, 2021, which claims the benefit of and priority to U.S. Provisional Application No. 62 / 983,286, filed on February 28, 2020, which are hereby assigned to the assignee thereof and are hereby expressly incorporated herein by reference in their entirety as if fully set forth below and for all applicable purposes. Technical Field

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

[0004] Wireless communication systems are widely deployed to provide various telecommunication services, such as telephony, video, data, messaging, and broadcast. These wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access systems include the Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) system, the LTE-Advanced (LTE-A) system, the Code Division Multiple Access (CDMA) system, the Time Division Multiple Access (TDMA) system, the Frequency Division Multiple Access (FDMA) system, the Orthogonal Frequency Division Multiple Access (OFDMA) system, the Single Carrier Frequency Division Multiple Access (SC-FDMA) system, and the Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system, to name a few.

[0005] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at the city, country, region, and even global levels. 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 frequency efficiency, reducing costs, improving services, utilizing new frequencies, and using OFDMA with cyclic prefixes (CPs) on the downlink (DL) and uplink (UL) to better integrate with other open standards. To these ends, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0006] However, as demand for mobile broadband access continues to grow, there is a need for further improvements to NR and LTE technologies. Preferably, these improvements should also apply to other multiple access technologies and the telecommunication standards that employ them. Summary of the Invention

[0007] The systems, methods, and devices of the present disclosure each have several aspects, no single aspect being solely responsible for the desirable properties. Without limiting the scope of the present disclosure as expressed in the appended claims, some features will now be briefly discussed. After considering this discussion, and particularly after reading the section entitled "Detailed Description of the Invention," one will understand how the features of the present disclosure provide advantages, including improved discontinuous reception (DRX).

[0008] Certain aspects provide a method for wireless communications by a first user equipment (UE). The method generally includes: applying a DRX configuration to the first UE; monitoring first signaling from a second UE indicating that the second UE has data to send to the first UE, the first signaling being transmitted using a plurality of transmit beams during a DRX cycle of the DRX configuration; selecting one or more transmit beams from the plurality of transmit beams based on the monitoring of the first signaling; and communicating in accordance with the selection.

[0009] Certain aspects provide a method for wireless communication by a first UE. The method generally includes: transmitting first signaling to a second UE if the first UE has data to send to the second UE, the first signaling being transmitted using multiple transmit beams during a DRX cycle of a DRX configuration of the second UE; receiving an indication of one or more transmit beams from the multiple transmit beams; and communicating based on the received indication.

[0010] Certain aspects provide an apparatus for wireless communications by a first UE. The apparatus generally includes a memory; and one or more processors coupled to the memory, the memory and the one or more processors configured to: apply a DRX configuration to the first UE; monitor first signaling from a second UE indicating that the second UE has data to send to the first UE, the first signaling being transmitted using a plurality of transmit beams during a DRX cycle of the DRX configuration; select one or more transmit beams from the plurality of transmit beams based on the monitoring of the first signaling; and communicate in accordance with the selection.

[0011] Certain aspects provide an apparatus for wireless communication by a first UE. The apparatus generally includes a memory; and one or more processors coupled to the memory, the memory and the one or more processors being configured to: transmit first signaling to a second UE if the first UE has data to transmit to the second UE, the first signaling being transmitted using multiple transmit beams during a DRX cycle of a DRX configuration of the second UE; receive an indication of one or more transmit beams from the multiple transmit beams; and communicate based on the received indication.

[0012] Certain aspects provide an apparatus for wireless communication by a first UE. The method generally includes: applying means for applying a DRX configuration to the first UE; monitoring first signaling from a second UE indicating that the second UE has data to send to the first UE, the first signaling being transmitted using multiple transmit beams during a DRX cycle of the DRX configuration; selecting means for selecting one or more transmit beams from the multiple transmit beams based on the monitoring of the first signaling; and communicating means for communicating according to the selection.

[0013] Certain aspects provide a method for wireless communication by a first UE. The method generally includes: a transmitting device configured to transmit first signaling to a second UE if the first UE has data to send to the second UE, the first signaling being transmitted using multiple transmit beams during a DRX cycle of a DRX configuration of the second UE; a receiving device configured to receive an indication of one or more transmit beams from the multiple transmit beams; and a communicating device configured to communicate based on the received indication.

[0014] To accomplish the foregoing and related ends, one or more aspects include the features fully described below and particularly pointed out in the claims. The following description and accompanying drawings set forth in detail certain illustrative features of one or more aspects. However, these features are indicative of only some of the various ways in which the principles of the various aspects may be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order that the manner in which the above-described features of the present disclosure may be understood in detail, a more particular description, briefly summarized above, may have been made with reference to various aspects, some of which are illustrated in the accompanying drawings. It should be noted, however, that the drawings illustrate only certain typical aspects of the disclosure and are therefore not to be considered limiting of its scope, as the description may admit to other equally effective aspects.

[0016] Figure 1is a block diagram conceptually illustrating an example telecommunications system, in accordance with certain aspects of the present disclosure.

[0017] Figure 2 is a block diagram conceptually illustrating an example base station (BS) and user equipment (UE), in accordance with certain aspects of the present disclosure.

[0018] Figure 3A and Figure 3B A graphical representation of an example vehicle-to-everything (V2X) system is shown, according to some aspects of the present disclosure.

[0019] Figure 4 An example discontinuous reception (DRX) configuration for a UE in some aspects is shown.

[0020] Figure 5 is a flow diagram illustrating example operations for wireless communications in accordance with certain aspects of the present disclosure.

[0021] Figure 6 is a flow diagram illustrating example operations for wireless communications in accordance with certain aspects of the present disclosure.

[0022] Figure 7A 、 Figure 7B 、 Figure 7C 、 Figure 7D Example techniques for beam management in accordance with certain aspects of the present disclosure are shown.

[0023] Figure 8A and Figure 8B Example sequence configurations for beam management, in accordance with certain aspects of the present disclosure, are shown.

[0024] Figure 9 A communications apparatus is shown that may include various components configured to perform operations for the techniques disclosed herein.

[0025] To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements disclosed in one aspect may be beneficially utilized on other aspects without specific recitation. DETAILED DESCRIPTION

[0026] Aspects of the present disclosure provide devices, methods, processing systems, and computer-readable media for SL beam training for a sidelink (SL) configured with discontinuous reception (DRX). For example, during a DRX on phase, an "I want to send" signal (also referred to as "IWTS") can be transmitted by a transmitting UE to a receiving UE, thereby indicating to the receiving UE that the transmitting UE has data to send to the receiving UE. In some aspects, the IWTS signal can be used for beam management. For example, the IWTS signal can be transmitted using different transmit beams and received using different receive beams, thereby allowing beam alignment for communication between the transmitting UE and the receiving UE.

[0027] The following description provides examples of configurations for SL communication in a communication system and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made to the functions and arrangements of the elements discussed without departing from the scope of the present disclosure. Various examples may omit, substitute, or add various processes or components as appropriate. For example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Moreover, features described with respect to some examples may be combined in some other examples. For example, a device may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the present disclosure is intended to cover such devices or methods that are practiced using other structures, functions, or structures and functions in addition to or different from the various aspects of the disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein may be embodied by one or more elements of the claims. The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any aspect described herein as "exemplary" is not necessarily to be construed as being preferred or advantageous over other examples.

[0028] In general, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific radio access technology (RAT) and can operate on one or more frequencies. RAT can also be referred to as radio technology, air interface, etc. Frequency can also be referred to as 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 of different RATs. In some cases, 5G NR RAT networks can be deployed.

[0029] Figure 1 An example wireless communication network 100 is shown in which aspects of the present disclosure may be performed. For example, the wireless communication network 100 may be a NR system (e.g., a 5G NR network).

[0030] like Figure 1As shown, the wireless communication network 100 may include a plurality of base stations (BSs) 110a to 110z (each also individually referred to herein as BS 110 or collectively referred to herein as BS 110) and other network entities. BS 110 may provide communication coverage for a particular geographic area (sometimes referred to as a "cell"), which may be fixed or may be mobile based on the location of mobile 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 via various types of backhaul interfaces (e.g., direct physical connections, wireless connections, virtual networks, etc.) using any suitable transport network. Figure 1 In the illustrated example, BSs 110a, 110b, and 110c may be macro BSs for macro cells 102a, 102b, and 102c, respectively. BS 110x may be a pico BS for pico cell 102x. BSs 110y and 110z may be femto BSs for femto cells 102y and 102z, respectively. A BS may support one or more cells. BS 110 communicates with user equipment (UEs) 120a through 120y (each also referred to herein individually as UE 120 or collectively as UEs 120) in wireless communication network 100. UEs 120 (e.g., 120x, 120y, etc.) may be dispersed throughout wireless communication network 100, and each UE 120 may be stationary or mobile.

[0031] According to certain aspects, UE 120 can be configured to perform beam training on a sidelink while in a discontinuous reception (DRX) mode of operation. Figure 1 As shown, UE 120a includes a DRX manager 122. DRX manager 122 may be configured to transmit and receive signaling for beam management, as described in greater detail herein.

[0032] The wireless communication network 100 may also include a relay station (e.g., relay station 110r), also referred to as a repeater, which receives transmissions of data and / or other data from an upstream station (e.g., BS110a or UE 120r) and sends transmissions of data and / or other information to a downstream station (e.g., UE 120 or BS110), or relays transmissions between UEs 120 to facilitate communication between devices.

[0033] A network controller 130 may couple to a set of BSs 110 and provide coordination and control for these BSs 110. The network controller 130 may communicate with the BSs 110 via a backhaul. The BSs 110 may also communicate with each other (eg, directly or indirectly) via a wireless or wired backhaul.

[0034] Figure 21 shows a BS 110a and a UE 120a (eg, in Figure 1 Example components of the wireless communication network 100 ).

[0035] At BS 110a, a transmit processor 220 may receive data from a data source 212 and control information from a controller / processor 240. Control signals may be for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical hybrid ARQ indicator channel (PHICH), a physical downlink control channel (PDCCH), a group common PDCCH (GC PDCCH), etc. Data may be for a physical downlink shared channel (PDSCH), etc. Processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. Transmit processor 220 may also generate reference symbols, such as, for example, a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a cell-specific reference signal (CRS). A transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​the data symbols, control symbols, and / or reference symbols (if applicable), and may provide output symbol streams to modulators (MODs) 232a through 232t. Each modulator 232 can process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator can further process the output sample stream (e.g., convert to analog, amplify, filter, and frequency upconvert) to obtain a downlink signal. The downlink signals from modulators 232a through 232t can be transmitted via antennas 234a through 234t, respectively.

[0036] At UE 120a, antennas 252a through 252r can receive downlink signals from BS 110a and can provide received signals to demodulators (DEMODs) 254a through 254r, respectively, within the transceiver. Each demodulator 254 can condition (e.g., filter, amplify, downconvert, and digitize) a corresponding 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 demodulators 254a through 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 UE 120a to a data sink 260, and provide decoded control information to a controller / processor 280.

[0037] On the uplink, at the UE 120a, a transmit processor 264 may receive and process data from a data source 262 (e.g., for a physical uplink shared channel (PUSCH)) and control information from the controller / processor 280 (e.g., for a physical uplink control channel (PUCCH)). The transmit processor 264 may also generate reference symbols for a reference signal (e.g., a sounding reference signal (SRS)). The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 (if applicable), further processed by demodulators 254a through 254r in the transceiver (e.g., for SC-FDM, etc.), and transmitted to the BS 110a. At the BS 110a, the uplink signal from the UE 120a may be received by the antenna 234, processed by the modulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain the signal received by the UE. The receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to a controller / processor 240.

[0038] Memories 242 and 282 may store data and program codes for BS 110a and UE 120a, respectively.A scheduler 244 may schedule UEs for data transmission on the downlink and / or uplink.

[0039] The controller / processor 280 and / or other processors and modules at the UE 120a may perform or direct the execution of processes for the techniques described herein. Figure 2 As shown, the controller / processor 280 of the UE 120a has a DRX manager 122. Although shown at the controller / processor level, other components of the UE 120a may be used to perform the operations described herein.

[0040] Figure 3A and Figure 3B A graphical representation of an example vehicle-to-everything (V2X) system is shown according to some aspects of the present disclosure. For example, Figure 3A and Figure 3B The UE shown in FIG. 4 can communicate via a sidelink channel and can perform sidelink CSI reporting as described herein.

[0041] exist Figure 3A and Figure 3B The V2X system provided in [1] provides two complementary transmission modes. Figure 3A The first transmission mode shown in relates to direct communication (e.g. also referred to as sidelink communication) between two participants that are close to each other in a local area. Figure 3BThe second transmission mode shown in FIG involves network communication through the network, which can be achieved through the Uu interface (e.g., the wireless communication interface between the radio access network (RAN) and the UE). As shown, the UEs 352 and 354 can communicate with each other using a side link (SL) 398.

[0042] refer to Figure 3A , a V2X system 300 (e.g., including vehicle-to-vehicle (V2V) communications) is shown with two UEs 302, 304 (e.g., vehicles). A first transmission mode allows direct communication between different participants at a given geographic location. As shown, the vehicles can have a wireless communication link 306 (e.g., via the UE) with a person (V2P) through a PC5 interface. Communication between the UEs 302 and 304 can also occur through a PC5 interface 308. In a similar manner, communication can occur from the UE 302 to other highway components (e.g., highway component 310), such as traffic signals or signs (V2I), through a PC5 interface 312. Figure 3A Each communication link shown in FIG3 allows for bidirectional communication between components, so each element can be both a transmitter and a receiver of information. V2X system 300 can be a self-managing system that can be implemented without assistance from network entities. A self-managing system can achieve improved spectrum efficiency, reduced costs, and increased reliability because no network service interruptions occur during handover operations for moving vehicles. V2X systems can be configured to operate in either licensed or unlicensed spectrum, so any vehicle equipped with the system can access a common frequency and share information. This coordinated / shared spectrum operation allows for safe and reliable operation.

[0043] Figure 3B A V2X system 350 is shown for communications between a UE 352 (e.g., a vehicle) and a UE 354 (e.g., a vehicle) via a network entity 356. These network communications can occur through discrete nodes such as base stations (e.g., eNBs or gNBs), which send and receive information to and from the UEs 352 and 354 (e.g., relay information between them). Network communications over vehicle-to-network (V2N) links (e.g., Uu links 358 and 310) can be used, for example, for long-distance communications between vehicles, such as for communicating a car accident a certain distance ahead along a road or highway. Other types of communications can be sent by nodes to 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 cloud-based sharing services.

[0044] In some cases, two or more slave 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 sidelinks. Other applications of sidelink communications may include public safety or service announcement communications, communications for proximity services, communications for UE to network relay, device-to-device (D2D) communications, Internet of Everything (IoE) communications, Internet of Things (IoT) communications, mission-critical mesh communications, and other suitable applications. Generally, a sidelink can refer to a direct link between one slave entity (e.g., UE1) and another slave entity (e.g., UE2). Thus, a sidelink can be used to transmit and receive communications (also referred to herein as "sidelink signals") without relaying the communications through a scheduling entity (e.g., BS), even though the scheduling entity may be used for scheduling or control purposes. In some examples, sidelink signals can be communicated using licensed spectrum (unlike wireless local area networks that typically use unlicensed spectrum).

[0045] Various sidelink channels can be used for sidelink communications, including the physical sidelink discovery channel (PSDCH), the physical sidelink control channel (PSCCH), the physical sidelink shared channel (PSSCH), and the physical sidelink feedback channel (PSFCH). The PSDCH can carry discovery expressions that enable neighboring 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 transmission. The PSFCH can carry feedback, such as channel state information (CSI) related to the sidelink channel quality.

[0046] Example Techniques for Beam Training of a Sidelink (SL) Configured with Discontinuous Reception (DRX) In a discontinuous reception (DRX) mode of operation, a UE may enter a low-power ("sleep") mode (also referred to herein as a "sleep phase") (which may also be referred to as a low-power state) for a certain period of time (referred to as a DRX-off period, phase, or duration) and wake up during a DRX-on (e.g., wake-up phase) period to check if there is any data to receive. The cycle of sleep and wake-up (DRX-on and DRX-off) periods repeats over time, allowing the UE to save power while maintaining communications.

[0047] Figure 4An example DRX configuration 400 for a UE is shown. As shown, the DRX configuration 400 may include DRX on phases 402 and 404. As described herein, the DRX on phase repeats in each DRX cycle. For example, the DRX on phase 402 is during a DRX cycle 406, as shown. The UE wakes up during the DRX on phases 402 and 404 to monitor signaling that can be received, and is in a low-power state (e.g., sleep phase) (also referred to as a DRX sleep phase) at other times. In some cases, multiple UEs in sidelink (SL) communication may be configured with a DRX configuration. In some cases, beam sweeping may be performed to facilitate communication between SLUEs. The UE that transmits a signal for beam sweeping may be referred to as a transmitting (TX) UE, and the UE that receives the signal may be referred to as a receiving (RX) UE. For example, the RX UE may receive "I Want to Send" signaling (IWTS) 410 from the TX UE at the start of the DRX on phase 410, thereby indicating that the TX UE has data to send. IWTS may also be used for beam management, as described in more detail herein.

[0048] After the DRX sleep phase of the RX UE, the beam between the TX UE and the RX UE may expire. Given that multiple SL UEs may communicate with a single SL UE, certain aspects of the present disclosure provide techniques for beam management during the DRX on phase of a DRX configuration. Beam management or sweeping may be performed during the DRX on phase to address beam misalignment between the TX UE and the RX UE.

[0049] For a Uu link, a UE communicates with a base station (BS) and has one DRX setting (e.g., DRX setting with respect to the BS). However, for SL, a UE may communicate with multiple UEs and may have multiple DRX settings (e.g., one DRX setting per UE). Certain aspects provide methods for aligning the DRX on durations of UEs in SL communications.

[0050] In some aspects, the DRX On phase can be aligned in a time-orthogonal manner on different TX UEs. For a given RX UE, there may be only one TX UE during the DRX On phase, and beam management / sweeping can be performed independently on different TX UEs (e.g., beam sweeping can be performed on a pair of UEs at a time). This can be similar to beam management on the Uu link. However, from a power consumption and processing power perspective, this option for SL is expensive because there may be multiple SL UEs communicating with one SL UE. In addition, during any given DRX On phase, the probability of a TX UE contacting an RX UE may be relatively low.

[0051] Another option is for the RX UE to use the same DRX settings (including the same DRX on) as the TX UE. In certain aspects of the present disclosure, the DRX on phase can overlap in time for all TX UE-RX UE pairs, and beam management / sweeping can be performed once for all TX UEs. Certain aspects provide techniques for handling situations where more than one TX UE contacts the RX UE during the same DRX on phase of the RX UE.

[0052] Figure 5 is a flow diagram illustrating example operations 500 of wireless communications, in accordance with certain aspects of the present disclosure. Operations 500 may be performed, for example, by a first UE (e.g., such as UE 120a in wireless communication network 100). The first UE with respect to operations 500 may be referred to as an Rx UE.

[0053] Operation 500 may be implemented as a process on one or more processors (e.g., Figure 2 In addition, the signal transmission and reception by the UE in operation 500 may be performed, for example, via one or more antennas (e.g., Figure 2 In some aspects, transmission and / or reception by the UE may be implemented via a bus interface of one or more processors (e.g., controller / processor 280) to obtain and / or output signals.

[0054] Operations 500 may begin at block 505, where a first UE applies a DRX configuration of the first UE and, at block 510, monitors for first signaling from a second UE (also referred to herein as "I Want to Send" signaling (IWTS)) indicating that the second UE has data to send to the first UE, the first signaling being transmitted using multiple transmit beams during a DRX cycle of the DRX configuration. At block 515, the first UE may select one or more transmit beams from the multiple transmit beams based on the monitoring of the first signaling and, at block 520, communicate in accordance with the selection. For example, the first UE may transmit second signaling (e.g., IWTS) to the second UE in accordance with the selection.

[0055] Figure 6 is a flow diagram illustrating example operations 600 of wireless communications, in accordance with certain aspects of the present disclosure. Operations 600 may be performed, for example, by a first UE (e.g., such as UE 120t in wireless communication network 100). The first UE with respect to operations 600 may be referred to as a Tx UE.

[0056] Operation 600 may be implemented as a process on one or more processors (e.g., Figure 2In addition, the signal transmission and reception by the first UE in operation 600 may be performed, for example, via one or more antennas (e.g., Figure 2 In some aspects, transmission and / or reception by the UE may be implemented via a bus interface of one or more processors (e.g., controller / processor 280) to obtain and / or output signals.

[0057] Operations 600 may begin at block 605, where the first UE transmits first signaling to the second UE if the first UE has data to transmit to the second UE, the first signaling (also referred to herein as "I Want to Send" signaling (IWTS)) being transmitted using multiple transmit beams during a DRX cycle of a DRX configuration of the second UE. At block 610, the first UE may receive an indication of one or more transmit beams from the plurality of transmit beams and, at block 615, communicate according to the received indication.

[0058] In other words, if the SL TX UE has data to send to the SL RX UE, then at the beginning of the DRX on duration of the Rx UE (e.g., DRX on phase 402), the TX UE sweeps the beam in all directions and transmits an "I want to send" signal or signaling (IWTS) in each direction. The DRX configuration of the SL RX UE can be the same and known to all SL TX UEs via configuration. The IWTS is sent during the beam management / beam sweeping phase performed during the DRX on phase of the RX UE. If there is data to send to the RX UE, the TX UE can wake up during the DRX on phase of the RX UE.

[0059] From the perspective of the RX UE, the IWTS can be designed as a single known sequence or a set of known sequences. For example, a TX UE can communicate with multiple RX UEs. Therefore, when transmitting an IWTS to different RX UEs, the TX UE can use different sequences. For example, the IWTS for a first RX UE can identify the UE pair of the TX UE and the first RX UE, while the IWTS for a second RX UE can identify the UE pair of the TX UE and the second RX UE. In this way, the IWTS is RX-centric. In other words, a known sequence can be used in the IWTS to identify the RX UE or the TX UE-RX UE pair, and the IWTS can be sent during the DRX on phase of the RX UE. The IWTS can be sent only when the TX UE has data to send to the RX UE, thereby performing beam management.

[0060] IWTS may be a quick paging message that is also used for beam management. IWTS may be designed as a broadband or narrowband signal. If transmitted as a broadband signal, IWTS may be more suitable for beam management because the frequency selective channel may span the entire bandwidth of the channel (or at least the entire bandwidth of the component carrier (CC) on the channel). However, transmitting IWTS using a narrowband signal may be better in terms of UE power saving. IWTS may be similar to Uu link beam sweeping during a random access channel (RACH). An example difference may be that the beam tracking sequence of IWTS may be lighter than the Uu link beam tracking sequence (such as a synchronization signal block (SSB)) and the beam management protocol may involve fewer steps.

[0061] Figure 7A 、 Figure 7B 、 Figure 7C 、 Figure 7D Example techniques for beam management according to certain aspects of the present disclosure are shown. Figure 7A As shown, the TX UE may transmit an IWTS using a sweep of transmit beams b1_t, b2_t, b3_t, b4_t, and b5_t during each of the beam management opportunities 702, 704, 706, 708, and 710. During each of the beam management opportunities 702, 704, 706, 708, and 710, the UE may monitor the IWTS using one of receive beams b1_r, b2_r, b3_r, b4_r, and b5_r, as shown. For example, the UE may receive an IWTS transmitted using transmit beam b2_t (e.g., where the energy level is above a threshold) via receive beam b3_r during transmit opportunity 706, and may also receive an IWTS transmitted via transmit beam b3_t via receive beam b4_r during transmit opportunity 708.

[0062] During the next beam management opportunity 712, the Rx UE may transmit an IWTS 714 using the transmit beam corresponding to the receive beam b3_r, and may transmit an IWTS 716 using the transmit beam corresponding to the receive beam b4_r. For example, the IWTS 714 may be transmitted during the transmit opportunity 718 configured for transmit beam b2_t, and the IWTS 716 may be transmitted during the transmit opportunity 720 configured for transmit beam b3_t. Thus, the TX UE that receives the IWTSs 714 and 716 knows that the transmit beams b2_t and b3_t will be used for communication (e.g., are transmit beams that are successfully received by the Rx UE).

[0063] like Figure 7BAs shown, the UE can only receive the IWTS transmitted via transmit beam b2_t via receive beam b3_r. Therefore, the RX UE can transmit the IWTS 714 as shown. In other words, the RX UE's transmission of the IWTS serves to indicate to the TX UE that the beam will be used for communication. As shown, the physical sidelink control channel (PSCCH) and / or physical sidelink shared channel (PSSCH) transmission phase can be after the beam management / sweeping phase.

[0064] In certain aspects, the RX UE monitors for IWTS by sweeping its receive beam at the beginning of each of its DRX On phases, thereby attempting to receive IWTS from one or more TX UEs. In some cases, more than one SL TX UE may transmit IWTS during the same DRX On duration of the RX UE. Certain aspects provide techniques for handling situations where more than one TX UE contacts the RX UE during the same DRX On duration.

[0065] Figure 8A and Figure 8B An IWTS sequence configuration according to certain aspects of the present disclosure is shown. In certain aspects, the IWTS may include a set of known sequences, each of which uniquely identifies a TX-RX UE pair. For example, Figure 8A As shown, multiple TX UEs (TX UE 1 and TX UE 2) can communicate with multiple RX UEs. As shown, each RX-TX UE pair can use a different sequence among sequences A, B, and C. In this case, the RX UE can detect which TX UE is transmitting during the beam management / sweeping phase, regardless of whether one or more TX UEs are transmitting during the same DRX on-duration, as long as there is no collision.

[0066] Collisions may occur during the beam management / sweeping phase, e.g. Figure 7C As shown. A collision generally refers to more than one TX UE transmitting during the same DRX on-duration and the RX UE cannot detect the IWTS. For example, multiple TX UEs may transmit IWTS during beam management opportunities 702, 704, 706, 708, and 710. If detected, the IWTS transmitted by the TX UE using transmit beam b2_t may be received by the RX UE via receive beam b3_t. However, since the IWTS is transmitted by two TX UEs at the same time and using different sequences, the RX UE may not be able to detect the IWTS, which is called a collision. However, if the IWTS transmitted by different TX UEs is received at different times, no collision occurs. For example, as described with respect to Figure 7AAs shown, an IWTS may be received from one TX UE during a beam management opportunity 706, and an IWTS may be received from another TX UE during a beam management opportunity 708. The RX UE is able to detect the IWTS and distinguish which TX UE transmitted the IWTS during the beam management opportunities 706 and 708 (if different sequences are used). However, the SL RX UE must monitor multiple known sequences, which may be expensive in terms of processing power.

[0067] In certain aspects, a single known sequence per RX UE may be used for all TX UEs communicating with the RX UE. Figure 8B As shown, multiple TX UEs (TX UE 1 and TX UE 2) can communicate with multiple RX UEs. As shown, for IWTS transmitted to RX UE 1, TX UE 1 and TX UE 2 can use the same sequence A. However, for IWTS to RX UE 2, TX UE 2 can use sequence B. In this case, the RX UE may not be able to determine which TX UE transmitted the detected IWTS. Therefore, in some aspects, the identifier (ID) of the TX UE can be included in the PSCCH or PSSCH transmitted during the PSCCH / PSSCH transmission phase. In addition, as shown in FIG. Figure 7D As shown, even if two TX UEs transmit IWTS at the same time, no collision may occur because the IWTS transmission sequences are the same. In other words, IWTS 714 can be sent during transmit opportunity 718 configured for transmit beam b2_t and received via b3_r, as shown. Therefore, the Rx UE can know that one or more TX UEs have transmitted IWTS using beam b2_t during transmit opportunity 706, but may not be able to identify one or more TX UEs during the beam sweep phase.

[0068] In this case, a collision may still occur during the PSCCH / PSSCH transmission phase because the PSCCH / PSSCH from different TX UEs are different. In order to reduce the possibility (probability) of a collision during the PSCCH / PSSCH transmission phase, the SLTX UE may randomly select the PSCCH / PSSCH timing to be used for data transmission. Although no collision may occur during the beam management / sweeping phase, if more than one TX UE transmits during the same DRX on phase of the RX UE, a collision may occur during the PSCCH / PSSCH transmission phase, even if the PSCCH / PSSCH timing is randomly selected.

[0069] When multiple UEs transmit IWTS to the RX UE, and the RX UE detects IWTS transmitted using different transmit beams and / or received via different receive beams (e.g., Figure 7A (as shown in FIG5 ), different IWTS transmissions may originate from different TXUEs or from the same TXUE but associated with different signal paths (e.g., due to reflections). If the sequences of the IWTS transmissions from different TXUEs are the same, the RX UE can determine whether the different IWTS transmissions originate from different TXUEs or from the same TXUE but associated with different signal paths. However, if the same sequence is used for IWTS transmissions from different TXUEs, the RX UE cannot determine whether the different IWTS transmissions originate from different TXUEs or from the same TXUE but associated with different signal paths.

[0070] When multiple UEs transmit IWTS to an RX UE and the RX UE detects the IWTS transmitted using a single transmit beam and received via a single receive beam, the UE can detect the IWTS only if the same sequence is used for the IWTS transmission, as described with respect to Figure 7D and Figure 8B As described herein. Therefore, if different sequences are used and the UE detects an IWTS transmitted using a single transmit beam and received via a single receive beam, the RX UE can determine (e.g., assume) that the detected IWTS transmission is from a single TX UE and can know the ID of the TX UE based on the sequence of the IWTS. If the same sequence is used for IWTS transmission, the RX UE can determine that the detected IWTS transmission is from a single TX UE, but may not be able to determine which TX UE the IWTS transmission is from. Therefore, as described herein, the ID of the TX UE can be included in the PSCCH or PSSCH during the PSCCH / PSSCH transmission phase.

[0071] In certain aspects, when the RX UE sweeps its beam at the beginning of its DRX on duration, the RX UE may first use the RX beam used before its DRX sleep (e.g., when monitoring the IWTS during the DRX on phase 404, the RX UE may use the receive beam used to receive signaling during the DRX cycle 406), and / or the RX UE may first use a wide beam to receive the IWTS, and if the IWTS is not received using the wide beam, continue to use a narrow beam. To this end, the TX UE may need to be configured to know the beam sweeping process of the RX UE (e.g., the duration for which the RX UE uses the receive beam used before the RX UE's DRX sleep phase, and / or the duration for which the RX UE uses the wide beam and the narrow beam). As described herein, beam management / beam sweeping via the IWTS may be implemented as long as the RX UE is configured with DRX, while one or more TX UEs (communicating with the RX UE) may or may not be configured with DRX.

[0072] Figure 9 A communication device 900 is shown that may include devices configured to perform the operations of the techniques disclosed herein (such as Figure 5 and Figure 6 The communication device 900 may include various components (e.g., corresponding to means-plus-function components) of the communication device 900. The communication device 900 may include a processing system 902 coupled to a transceiver 908. The transceiver 908 is configured to transmit and receive signals for the communication device 900, such as the various signals described herein, via an antenna 910. The processing system 902 may be configured to perform processing functions for the communication device 900, including processing signals received and / or to be transmitted by the communication device 900.

[0073] The processing system 902 includes a processor 904 coupled to a computer-readable medium / memory 912 via a bus 906. In some 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 Figure 5 and Figure 6 912; and selection circuitry 926.

[0074] Example aspects

[0075] Aspect 1. A method for wireless communication by a first user equipment (UE), comprising: applying a discontinuous reception (DRX) configuration to the first UE; monitoring first signaling from a second UE indicating that the second UE has data to send to the first UE, the first signaling being transmitted using multiple transmit beams during a DRX cycle of the DRX configuration; selecting one or more transmit beams from the multiple transmit beams based on the monitoring of the first signaling; and communicating according to the selection.

[0076] Aspect 2. The method according to aspect 1, wherein the first signaling transmitted using each of the plurality of transmit beams is monitored using one of a plurality of receive beams.

[0077] Aspect 3. The method according to any one of aspects 1 to 2, wherein the first signaling is transmitted during the start of a wake-up phase of the DRX cycle.

[0078] Aspect 4. A method according to any one of Aspects 1 to 3, wherein: the first signaling is transmitted by the second UE and the third UE; the first signaling transmitted from the second UE includes a sequence indicating identifiers (IDs) associated with the first UE and the second UE; and the first signaling transmitted from the third UE includes a sequence indicating IDs associated with the first UE and the third UE.

[0079] Aspect 5. A method according to any one of aspects 1 to 4, wherein: the first signaling is transmitted by the second UE and a third UE; and the first signaling transmitted from the second UE and the third UE includes the same sequence identifying the first UE.

[0080] Aspect 6. The method according to any one of Aspects 1 to 5 further includes: receiving the first signaling transmitted using the first transmit beam among the multiple transmit beams via a first receive beam; and transmitting a second signaling via a transmit beam corresponding to the first receive beam, the second signaling being transmitted during a transmit opportunity configured for the first transmit beam, wherein the communication is based on the first receive beam.

[0081] Aspect 7. The method according to aspect 6, wherein the communication comprises communicating with the second UE and the third UE on a sidelink channel based on the first transmit beam and the first receive beam, wherein a transmission timing of the sidelink channel is randomly selected.

[0082] Aspect 8. A method according to any one of Aspects 6 to 7, wherein the communication includes communicating with the second UE on a first sidelink channel and communicating with a third UE on a second sidelink channel, the first sidelink channel and the second sidelink channel identifying the second UE and the third UE, respectively.

[0083] Aspect 9. The method according to any one of Aspects 1 to 8 further includes: receiving a first signaling transmitted using a first transmit beam among the multiple transmit beams via a first receive beam; receiving a first signaling transmitted using a second transmit beam among the multiple transmit beams via a second receive beam; transmitting a second signaling via a transmit beam corresponding to the first receive beam and during a transmit timing configured for the first transmit beam; and transmitting a third signaling via a transmit beam corresponding to the second receive beam and during a transmit timing configured for the second transmit beam.

[0084] Aspect 10. A method according to Aspect 9, wherein: the first signaling is transmitted by the second UE and the third UE; the first signaling received via the first receiving beam is transmitted by the second UE and includes a sequence indicating IDs associated with the first UE and the second UE; and the first signaling received via the second receiving beam is transmitted by the third UE and includes a sequence indicating IDs associated with the first UE and the third UE.

[0085] Aspect 11. The method according to aspect 10 further includes: communicating with the second UE based on the first receive beam; and communicating with the third UE based on the second receive beam.

[0086] Aspect 12. The method according to any one of aspects 9 to 11, wherein: the first signaling is transmitted by the second UE and a third UE; and the first signaling transmitted from the second UE and the third UE includes the same sequence.

[0087] Aspect 13. A method according to any one of Aspects 1 to 12, wherein the first signaling is monitored during a first DRX cycle of the DRX configuration, and wherein the first signaling is monitored via a receive beam used to receive signals during a previous DRX cycle of the DRX configuration.

[0088] Aspect 14. A method according to any one of Aspects 1 to 13, wherein monitoring the first signaling includes: monitoring the first signaling using a wide beam; and if the first signaling is not received when monitoring using the wide beam, monitoring the first signaling using a narrow beam.

[0089] Aspect 15. A method for wireless communication by a first user equipment (UE), comprising: if the first UE has data to send to a second UE, transmitting first signaling to the second UE, the first signaling being transmitted using multiple transmit beams during a DRX cycle of a DRX configuration of the second UE; receiving an indication of one or more transmit beams among the multiple transmit beams; and communicating according to the received indication.

[0090] Aspect 16. The method according to aspect 15, wherein the first signaling transmitted using each of the plurality of transmit beams is monitored by the second UE using one of a plurality of receive beams.

[0091] Aspect 17. The method according to any one of aspects 15 to 16, wherein the first signaling is transmitted during the start of a wake-up phase of the DRX cycle of the second UE.

[0092] Aspect 18. A method according to any one of Aspects 15 to 17, wherein: the first signaling is transmitted to a second UE and a third UE; the first signaling transmitted to the second UE includes a sequence indicating identifiers (IDs) associated with the first UE and the second UE; and the first signaling transmitted to the third UE includes a sequence indicating IDs associated with the first UE and the third UE.

[0093] Aspect 19. The method according to any one of Aspects 15 to 18 further includes transmitting the first signaling using a first transmit beam among the multiple transmit beams, wherein receiving the indication of the one or more transmit beams includes receiving second signaling via a receive beam corresponding to the first transmit beam, wherein the communication is based on the first transmit beam.

[0094] Aspect 20. The method of aspect 19, further comprising randomly selecting a transmission opportunity for communicating with the second UE on a sidelink channel based on the first transmit beam.

[0095] Aspect 21. The method of any one of aspects 19 to 20, wherein the communicating comprises communicating with the second UE on a first sidelink channel, the first sidelink channel identifying the first UE.

[0096] Aspect 22. The method according to any one of Aspects 15 to 21 further includes: transmitting a first signaling using a first transmit beam among the multiple transmit beams; and transmitting a first signaling using a second transmit beam among the multiple transmit beams, wherein receiving an indication of the one or more transmit beams includes: receiving a second signaling via a receive beam corresponding to the first transmit beam; and receiving a second signaling via a receive beam corresponding to the second transmit beam.

[0097] Aspect 23. A method according to Aspect 22, wherein: the first signaling is transmitted to a second UE and a third UE; the first signaling transmitted via the first transmit beam is transmitted to the second UE and includes a sequence indicating IDs associated with the first UE and the second UE; and the first signaling transmitted via the second transmit beam is transmitted to the third UE and includes a sequence indicating IDs associated with the first UE and the third UE.

[0098] Aspect 24. The method according to aspect 23 further comprises: communicating with the second UE based on the first transmit beam; and communicating with the third UE based on the second transmit beam.

[0099] Aspect 25. An apparatus comprising means for performing the method according to any one of aspects 1 to 24.

[0100] Aspect 26. An apparatus comprising at least one processor and a memory coupled to the at least one processor, the memory and the at least one processor being configured to perform the method according to any one of aspects 1 to 24.

[0101] Aspect 27. A computer-readable medium having stored thereon computer-executable code for wireless communication, the computer-executable code, when executed by at least one processor, causing a device to perform the method according to any one of aspects 1 to 24.

[0102] 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, etc. 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). OFDMA networks can implement radio technologies 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 others. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). LTE and LTE-A are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization called the 3rd Generation Partnership Project (3GPP). cdma2000 and UMB are described in documents from an organization called the 3rd Generation Partnership Project 2 (3GPP2). NR is an emerging wireless communication technology under development.

[0103] 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, although aspects may be described herein using terms typically associated with 3G, 4G, and / or 5G wireless technologies, aspects of the present disclosure can be applied to communication systems based on other generations.

[0104] In 3GPP, the term "cell" can refer to the coverage area of ​​a Node B (NB) and / or the NB subsystem serving this coverage area, depending on the context in which the term is used. In NR systems, the terms "cell" and "base station," next-generation Node B (gNB or gNodeB), access point (AP), distributed unit (DU), carrier, or transmit / receive point (TRP) are used interchangeably. A base station (BS) can provide communication coverage for macrocells, picocells, femtocells, and / or other types of cells. A macrocell can cover a relatively large geographic area (e.g., a radius of several kilometers) and can allow unrestricted access to UEs with service subscriptions. A picocell can cover a relatively small geographic area and can allow unrestricted access to UEs with service subscriptions. A femtocell can cover a relatively small geographic area (e.g., a home) and can allow restricted access to UEs associated with the femtocell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.). A base station for a macrocell can be referred to as a macro BS. A base station for a picocell can be referred to as a pico BS. A base station for a femtocell can be referred to as a femto BS or a home BS.

[0105] A UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, customer premises equipment (CPE), a cellular phone, a smartphone, 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, a home appliance, a medical device or equipment, a biosensor / device, a wearable device (such as a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring, a smart wristband, etc.)), an entertainment device (e.g., a music device, a video device, satellite radio, etc.), a vehicle component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium. Some UEs may 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 markers, etc. that can communicate with a BS, another device (e.g., a remote device), or some other entity. A wireless node can provide a connection to 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 may be considered Internet of Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.

[0106] Some wireless networks (e.g., LTE) use orthogonal frequency division multiplexing (OFDM) on the downlink and single carrier frequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDM divide the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, etc. 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 between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can depend on the system bandwidth. For example, the subcarrier spacing can be 15 kHz, and the minimum resource allocation (called a "resource block" (RB)) can be 12 subcarriers (or 180 kHz). Therefore, for system bandwidths of 1.25, 2.5, 5, 10, or 20 megahertz (MHz), the nominal fast Fourier transform (FFT) size can be equal to 128, 256, 512, 1024, or 2048, respectively. The system bandwidth can also be divided into subbands. For example, a subband may cover 1.8 MHz (e.g., 6 RBs), and there may be 1, 2, 4, 8, or 16 subbands for system bandwidths of 1.25, 2.5, 5, 10, or 20 MHz, respectively. In LTE, the basic transmission time interval (TTI) or packet duration is a 1 ms subframe.

[0107] NR can use OFDM with CP on both the uplink and downlink and includes support for half-duplex operation using TDD. In NR, the subframe is still 1ms, but the basic TTI is called a slot. A 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 basic subcarrier spacing of 15 kHz, and other subcarrier spacings can be defined relative to the basic subcarrier spacing, such as 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc. Symbol and slot lengths scale with the subcarrier spacing. The CP length also depends on the subcarrier spacing. Beamforming can be supported, and the beam direction can be dynamically configured. MIMO transmission with precoding can also be supported. In some examples, MIMO configurations in the DL can support up to 8 transmit antennas, with multi-layer DL transmission of up to 8 streams and up to 2 streams per UE. In some examples, multi-layer transmission of up to 2 streams per UE can be supported. Up to 8 serving cells can be used to support aggregation of multiple cells.

[0108] In some examples, access to the air interface can be scheduled. A scheduling entity (e.g., BS) allocates communication resources between some or all devices and equipment within its service area or cell. The scheduling entity may be responsible for scheduling, allocating, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communications, the subordinate entities use resources scheduled by the scheduling entity. The base station is not the only entity that can be used as a scheduling entity. In some examples, a UE can be used as a scheduling entity and can schedule resources for one or more subordinate entities (e.g., one or more other UEs), and other UEs can utilize the resources scheduled by the UE for wireless communications. In some examples, a UE can be used as a scheduling entity in a peer-to-peer (P2P) network and / or a mesh network. In the mesh network example, in addition to communicating with the scheduling entity, the UEs can communicate directly with each other.

[0109] In some examples, two or more slave entities (e.g., UEs) can communicate with each other using sidelink signals. Real-world applications of such sidelink communications may include public safety, proximity services, UE-to-network relay, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical grids, and / or various other suitable applications. Generally, a sidelink signal can refer to a signal that is transmitted from one slave entity (e.g., UE1) to another slave entity (e.g., UE2) without relaying the communication through a scheduling entity (e.g., UE or BS), even though the scheduling entity may be used for scheduling and / or control purposes. In some examples, the sidelink signal can be transmitted using licensed spectrum (unlike wireless local area networks that typically use unlicensed spectrum).

[0110] The methods disclosed herein include one or more steps or actions for implementing the methods. Method steps and / or actions may be interchangeable without departing from the scope of the claims. In other words, unless a specific order of steps or actions is specified, the order and / or use of specific steps and / or actions may be modified without departing from the scope of the claims.

[0111] As used herein, a phrase referring to "at least one" of a list of items refers to any combination of those items, including single members. As an example, "at least one of a, b, or c" is intended to encompass a, b, c, ab, ac, bc, and abc, as well as any combination with multiples of the same element (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0112] As used herein, the term "determine" encompasses a wide variety of actions. For example, "determine" may include calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, database, or another data structure), confirming, etc. Additionally, "determine" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), etc. Additionally, "determine" may include resolving, selecting, choosing, establishing, etc.

[0113] The preceding 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 apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. Accordingly, the claims are not intended to be limited to the aspects shown herein, but should be given the full scope consistent with the claim language, wherein, unless otherwise specifically stated, reference to an element in the singular is not intended to mean "one and only one," but rather "one or more." Unless otherwise specifically stated, the term "some" refers to one or more. All structural and functional equivalents to the elements of the various embodiments described throughout this disclosure that are known or later come to be known to one of ordinary skill in the art are expressly incorporated herein by reference and are intended to be covered by the claims. Furthermore, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. A claim element shall not be construed under the terms of 35 U.S.C. §112(f) unless the element is explicitly recited using the phrase "means for..." or, in the case of a method claim, the phrase "step for..."

[0114] The various operations of the above methods can be performed by any suitable device capable of performing the corresponding functions. The device may include various hardware and / or software components and / or modules, including but not limited to circuits, application specific integrated circuits (ASICs), or processors. Generally, where there are operations shown in the accompanying drawings, these operations may have corresponding device-plus-function components with similar numbers.

[0115] The various illustrative logical blocks, modules, and circuits described in conjunction with the present disclosure may be implemented or executed 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 may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration.

[0116] If implemented in hardware, an example hardware configuration may include a processing system in a wireless node. The processing system may be implemented using a bus architecture. The bus may include any number of interconnecting buses and bridges, depending on the specific application and overall design constraints of the processing system. The bus may link various circuits together, including a processor, a machine-readable medium, and a bus interface. The bus interface may be used to connect a network adapter and other things to the processing system via the bus. The network adapter may be used to implement the signal processing functions of the PHY layer. In the user terminal 120 (see Figure 1 ), a user interface (e.g., a keypad, display, mouse, joystick, etc.) may also be connected to the bus. The bus may also link various other circuits, such as timing sources, peripherals, voltage regulators, power management circuits, etc., which are well known in the art and therefore will not be described further. The processor may be implemented using one or more general 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 to best implement the described functionality of the processing system depending on the specific application and the overall design constraints imposed on the overall system.

[0117] If implemented in software, the functionality may be stored as one or more instructions or codes on or transmitted over a computer-readable medium. Whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise, software should be broadly interpreted to mean instructions, data, or any combination thereof. Computer-readable media include both computer storage media and communication media, including any medium that facilitates the transfer of a computer program from one place to another. The processor may be responsible for managing the bus and general processing, including the execution of software modules stored on a machine-readable storage medium. A computer-readable storage medium may be coupled to the processor so that the processor can read information from and write information to the storage medium. In an alternative, the storage medium may be integrated with the processor. By way of example, the machine-readable medium may include a transmission line, a carrier modulated by data, and / or a computer-readable storage medium having instructions stored thereon that is separate from the wireless node, all of which may be accessed by the processor via a bus interface. Alternatively or in addition, the machine-readable medium or any portion thereof may be integrated into the processor, such as may be the case with a cache and / or general register file. Examples of machine-readable storage media may include, for example, RAM (random access memory), flash memory, ROM (read-only memory), PROM (programmable read-only memory), EPROM (erasable programmable read-only memory), EEPROM (electrically erasable programmable read-only memory), registers, magnetic disks, optical disks, hard drives, or any other suitable storage media, or any combination thereof. The machine-readable medium may be embodied in a computer program product.

[0118] A software module may include a single instruction or many instructions and may be distributed across several different code segments, between different programs, and across multiple storage media. A computer-readable medium may include multiple software modules. A software module includes instructions that, when executed by a device such as a processor, cause a processing system to perform various functions. A software module may include a transmitting module and a receiving module. Each software module may reside in a single storage device or be distributed across multiple storage devices. By way of example, when a triggering event occurs, a software module may be loaded from a hard drive into RAM. During execution of a software module, the processor may load some of the instructions into a cache to increase access speed. One or more cache lines may then be loaded into a general register file for execution by the processor. When referring to the functions of a software module below, it will be understood that such functions are implemented by the processor when executing instructions from that software module.

[0119] Furthermore, 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 (IR), 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. As used herein, disk and disc include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Optical disks, where magnetic disks typically reproduce data magnetically, and optical disks, which use lasers to reproduce data optically. Thus, in some aspects, computer-readable media may include non-transitory computer-readable media (e.g., tangible media). Additionally, for other aspects, computer-readable media may include transitory computer-readable media (e.g., signals). Combinations of the above should also be included within the scope of computer-readable media.

[0120] Thus, certain aspects may include a computer program product for performing the operations presented herein. For example, such a computer program product may include a computer-readable medium having instructions stored (and / or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein, e.g., instructions for performing the operations described herein.

[0121] In addition, it should be understood that, if applicable, modules and / or other appropriate means for performing the methods and techniques described herein can be downloaded and / or otherwise obtained by the user terminal and / or base station. For example, such a device can be coupled to a server to facilitate the transmission of the means for performing the methods described herein. Alternatively, the various methods described herein can be provided via a storage device (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or a floppy disk, etc.) so that the user terminal and / or base station can obtain the various methods when the storage device is coupled or provided to the device. In addition, any other suitable technology for providing the methods and techniques described herein to the device can be used.

[0122] It should be understood that the claims are not limited to the exact configuration and components described above. Various modifications, changes and variations may 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 first user equipment (UE), comprising: Applying discontinuous reception (DRX) configuration to the first UE; monitoring first signaling from a second UE indicating that the second UE has data to send to the first UE, the first signaling being transmitted using a plurality of transmit beams during a DRX cycle of a DRX configuration; selecting one or more transmit beams of the plurality of transmit beams based on monitoring the first signaling; as well as Communicating according to the selection, wherein: The first signaling is transmitted by the second UE and the third UE; The first signaling transmitted from the second UE includes a sequence indicating identifiers (IDs) associated with the first UE and the second UE; and The first signaling transmitted from the third UE includes a sequence indicating IDs associated with the first UE and the third UE. 2 . The method of claim 1 , wherein the first signaling transmitted using each of the plurality of transmit beams is monitored using one of a plurality of receive beams. The method of claim 1 , wherein the first signaling is transmitted during the beginning of a wake-up phase of the DRX cycle.

4. The method according to claim 1, further comprising: receiving, via a first receive beam, first signaling transmitted using a first transmit beam among the plurality of transmit beams; as well as Second signaling is transmitted via a transmit beam corresponding to the first receive beam, the second signaling being transmitted during a transmit opportunity configured for the first transmit beam, wherein the communication is based on the first receive beam.

5. The method of claim 4, wherein the communicating comprises communicating with a second UE and a third UE on a sidelink channel based on the first transmit beam and the first receive beam, wherein a transmission timing of the sidelink channel is randomly selected.

6. The method of claim 4, wherein the communicating comprises communicating with a second UE on a first sidelink channel and communicating with a third UE on a second sidelink channel, the first sidelink channel and the second sidelink channel identifying the second UE and the third UE, respectively.

7. The method according to claim 1, further comprising: receiving, via a first receive beam, first signaling transmitted using a first transmit beam among the plurality of transmit beams; receiving, via a second receive beam, first signaling transmitted using a second transmit beam among the plurality of transmit beams; transmitting second signaling via a transmit beam corresponding to the first receive beam and during a transmit opportunity configured for the first transmit beam; as well as Third signaling is transmitted via a transmit beam corresponding to the second receive beam and during a transmit opportunity configured for the second transmit beam.

8. The method according to claim 7, further comprising: communicating with the second UE based on the first receive beam; as well as Communicate with the third UE based on the second receive beam.

9. The method of claim 1, wherein the first signaling is monitored during a first DRX cycle of the DRX configuration, and wherein the first signaling is monitored via a receive beam used to receive signals during a previous DRX cycle of the DRX configuration.

10. The method of claim 1 , wherein monitoring the first signaling comprises: monitoring the first signaling using a wide beam; as well as If the first signaling is not received while monitoring using the wide beam, the first signaling is monitored using a narrow beam.

11. A method for wireless communication by a first user equipment (UE), comprising: If the first UE has data to send to the second UE, transmitting first signaling to the second UE, where the first signaling is transmitted using multiple transmit beams during a DRX cycle of a DRX configuration of the second UE; receiving an indication of one or more transmit beams of the plurality of transmit beams; as well as Communicate according to the received instructions, wherein: The first signaling is transmitted to a second UE and a third UE; The first signaling transmitted to the second UE includes a sequence indicating identifiers (IDs) associated with the first UE and the second UE; and The first signaling transmitted to the third UE includes a sequence indicating IDs associated with the first UE and the third UE. 12 . The method of claim 11 , wherein the first signaling transmitted using each of the plurality of transmit beams is monitored by the second UE using one of a plurality of receive beams.

13. The method of claim 11, wherein the first signaling is transmitted during the start of a wake-up phase of a DRX cycle of the second UE.

14. The method of claim 11, further comprising transmitting first signaling using a first transmit beam of the plurality of transmit beams, wherein receiving an indication of the one or more transmit beams comprises receiving second signaling via a receive beam corresponding to the first transmit beam, wherein the communication is based on the first transmit beam.

15. The method of claim 14, further comprising randomly selecting a transmit opportunity for communicating with the second UE on a sidelink channel based on the first transmit beam.

16. The method of claim 14, wherein the communicating comprises communicating with the second UE on a first sidelink channel, the first sidelink channel identifying the first UE.

17. The method according to claim 11, further comprising: transmitting first signaling using a first transmit beam of the plurality of transmit beams; as well as transmitting first signaling using a second transmit beam of the plurality of transmit beams, wherein receiving an indication of the one or more transmit beams comprises: receiving second signaling via a receive beam corresponding to the first transmit beam; as well as The second signaling is received via a reception beam corresponding to the second transmission beam.

18. The method according to claim 17, further comprising: communicating with the second UE based on the first transmit beam; as well as Communicate with the third UE based on the second transmit beam.

19. A device for wireless communication by a first 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: Applying discontinuous reception (DRX) configuration to the first UE; monitoring first signaling from a second UE indicating that the second UE has data to send to the first UE, the first signaling being transmitted using a plurality of transmit beams during a DRX cycle of a DRX configuration; selecting one or more transmit beams of the plurality of transmit beams based on monitoring the first signaling; as well as Communicating according to the selection, wherein: The first signaling is transmitted by the second UE and the third UE; The first signaling transmitted from the second UE includes a sequence indicating identifiers (IDs) associated with the first UE and the second UE; and The first signaling transmitted from the third UE includes a sequence indicating IDs associated with the first UE and the third UE.

20. A device for wireless communication by a first 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: If the first UE has data to send to the second UE, transmitting first signaling to the second UE, where the first signaling is transmitted using multiple transmit beams during a DRX cycle of a DRX configuration of the second UE; receiving an indication of one or more transmit beams of the plurality of transmit beams; as well as Communicate according to the received instructions, wherein: The first signaling is transmitted to a second UE and a third UE; The first signaling transmitted to the second UE includes a sequence indicating identifiers (IDs) associated with the first UE and the second UE; and The first signaling transmitted to the third UE includes a sequence indicating IDs associated with the first UE and the third UE.

21. A computer-readable storage medium having stored thereon instructions that, when executed, cause one or more processors to perform the method of any one of claims 1-18.

22. A computer program product comprising computer-readable instructions which, when executed by a processor, cause the processor to perform the method according to any one of claims 1 to 18.

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