Switching between sidelink bandwidth parts

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) can transmit, to a second UE in a sidelink communication with the first UE, an indication to switch from utilizing a first sidelink bandwidth part (SL-BWP) to utilizing a second SL-BWP. The UE can selectively switch from utilizing the first SL-BWP to utilizing the second SL-BWP based at least in part on receiving a positive acknowledgement message from the second UE. Numerous other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This Patent Application claims priority to U.S. Nonprovisional Patent Application No. 17 / 247,817, titled “SWITCHING AMONG SIDELINK BANDWIDTH PARTS,” filed December 23, 2020, which is hereby expressly incorporated by reference herein.

[0003] TECHNICAL FIELD

[0004] Aspects of the present disclosure relate generally to wireless communication, and more specifically to techniques and apparatuses for switching among sidelink bandwidth parts (SL-BWPs). BACKGROUND

[0005] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems can 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 technologies include 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 Long Term Evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3 GPP).

[0006] A wireless network can include a number of base stations (BSs) that can support communication for a number of user equipment (UEs). A user equipment (UE) can communicate with a base station (BS) via the downlink and uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS can be referred to as a Node B, a gNB, an access point (AP), a radio head, a transmit receive point (TRP), a new radio (NR) BS, a 5G Node B, and / or the like.

[0007] The above multiple access technologies have been adopted in various telecommunication standards to provide common protocols to enable different wireless devices to communicate on a municipal, national, regional, and even global level. New Radio (NR), which can also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (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 OFDM with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP- OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread orthogonal frequency

[0008] SUMMARY

[0009] In some aspects, a first user equipment (UE) for wireless communication includes a memory and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to transmit, to a second UE in a sidelink communication with the first UE, an indication to switch from utilizing a first sidelink bandwidth part (SL-BWP) to utilizing a second SL-BWP; and selectively switch from utilizing the first SL-BWP to utilizing the second SL-BWP based at least in part on receiving a positive acknowledgement message from the second UE.

[0010] In some aspects, a method of wireless communication performed by a first UE includes transmitting, to a second UE in a sidelink communication with the first UE, an indication to switch from utilizing a first SL-BWP to utilizing a second SL-BWP; and selectively switching from utilizing the first SL-BWP to utilizing the second SL-BWP based at least in part on receiving a positive acknowledgement message from the second UE.

[0011] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a first UE, cause the first UE to transmit, to a second UE in a sidelink communication with the first UE, an indication to switch from utilizing a first SL-BWP to utilizing a second SL-BWP; and selectively switch from utilizing the first SL-BWP to utilizing the second SL-BWP based at least in part on receiving a positive acknowledgement message from the second UE.

[0012] In some aspects, a first device for wireless communication includes: means for transmitting to a second device in side-link communication with the first device an instruction to switch from using a first SL-BWP to using a second SL-BWP; and means for selectively switching from using the first SL-BWP to using the second SL-BWP based at least in part on receiving a positive confirmation message from the second device.

[0013] The aspects generally include, as substantially described herein with reference to the accompanying drawings and description, methods, apparatus, systems, computer program products, non-transient computer-readable media, user equipment, base stations, wireless communication equipment, and / or processing systems.

[0014] The foregoing has broadly outlined the features and technical advantages of the examples according to this disclosure in an effort to facilitate a better understanding of the following detailed description. Additional features and advantages will be described thereafter. The disclosed concepts and specific examples can be readily used as the basis for modifying or designing other structures for implementing the same purposes as this disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, in both their organization and manner of operation, and their associated advantages, will be better understood by considering the following description in conjunction with the accompanying drawings. Each drawing is provided for illustrative and descriptive purposes and not for defining limitations on the claims. Brief description of the attached diagram

[0016] To gain a more detailed understanding of the features described above in this disclosure, reference can be made to various aspects of the above brief overview, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and should not be considered as limiting its scope, as other equivalent aspects are permissible in this description. Identical reference numerals in different drawings may identify the same or similar elements.

[0017] Figure 1 This is a diagram illustrating examples of wireless networks according to various aspects of this disclosure.

[0018] Figure 2 This is a diagram illustrating an example of communication between a base station and a UE in a wireless network according to various aspects of this disclosure.

[0019] Figure 3 This is a diagram illustrating examples of switching between SL-BWPs in accordance with various aspects of this disclosure.

[0020] Figure 4 This is a diagram illustrating examples of switching between SL-BWPs in accordance with various aspects of this disclosure.

[0021] Figure 5is a diagram illustrating an example of a process associated with switching between SL-BWPs, in accordance with various aspects of the present disclosure.

[0022] Figure 6 is a diagram illustrating an example of a process associated with switching between SL-BWPs, in accordance with various aspects of the present disclosure.

[0023] Figure 7 is a diagram illustrating an example apparatus associated with switching between SL-BWPs, in accordance with various aspects of the present disclosure.

[0024] DETAILED DESCRIPTION

[0025] Various aspects of the disclosure are described more fully below. However, the disclosure may be implemented in any of numerous ways, and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided as illustrative examples so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. The scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of or in combination with any other aspect of the disclosure. For example, an apparatus can be implemented or a method can be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover such an apparatus or method which is practiced using, as alternative to, in combination with, or in addition to, any of the aspects of the disclosure described herein. It should be understood that any aspect of the disclosure disclosed herein can be embodied by one or more elements of a claim.

[0026] Several aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as “elements”). These elements can be implemented using hardware, software, or combinations thereof. Whether such elements are implemented as hardware or software depends on the particular application and design constraints imposed on the overall system.

[0027] It should be noted that while aspects can be described herein using terminology commonly associated with a 5G or NR radio access technology (RAT), aspects of the present disclosure can be applied to other RATs, such as a 3G RAT, a 4G RAT, and / or a RAT subsequent to 5G (e.g., 6G).

[0028] Figure 1is a diagram illustrating an example of a wireless network 100 in accordance with various aspects of the present disclosure. The wireless network 100 can be or can include elements of a 5G (NR) network and / or a LTE network among other examples. The wireless network 100 can include a number of base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 1 lOd) and other network entities. A base station (BS) is an entity that communicates with user equipment (UEs) and can also be referred to as an NR BS, a NodeB, a gNB, a 5G node B (NB), an access point, a transmit receive point (TRP), and / or the like. Each BS can provide communication coverage for a particular geographic area. In 3GPP, the term “cell” can refer to a coverage area of a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0029] BSs can be macro BSs, pico BSs, femto BSs, and / or other types of BSs. A macro BS can cover a relatively large geographic area (e.g., several kilometers in radius) and can allow unrestricted access by UEs with service subscriptions. A pico BS can cover a relatively small geographic area (e.g., a city neighborhood or a few adjacent buildings) and can allow unrestricted access by UEs with service subscriptions. A femto BS can cover a relatively small geographic area (e.g., a home or a few adjacent buildings) and can allow restricted access by UEs with service subscriptions, e.g., for access by UEs in one subscription. A BS for a macro cell can be referred to as a macro BS. A BS for a pico cell can be referred to as a pico BS. A BS for a femto cell can be referred to as a femto BS or a home BS. In the example shown in FIG. 1, a BS 110a can be a macro BS for a macro cell 102a, a BS 110b can be a pico BS for a pico cell 102b, and BSs 110c can be femto BSs for femto cells 102c. A BS can support one or multiple (e.g., three) cells. The terms “eNB,” “base station,” “NR BS,” “gNB,” “TRP,” “AP,” “Node B,” “5G NB,” and “cell” can be used interchangeably herein. Figure 1

[0030] In some aspects, a cell can not necessarily be stationary, and the geographic area of the cell can move according to the location of a mobile BS. In some aspects, BSs can be interconnected to one another and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces such as a direct physical connection or virtual network, using any suitable transport network.

[0031] ​Wireless network 100 can also include relay stations. A relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send a transmission of the data to a downstream station (e.g., a UE or a BS). A relay station can also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown in FIG. 1, relay BS 1 lOd can communicate with macro BS 110a and UE 120d in furtherance of communication between BS 110a and UE 120d. A relay BS can also be referred to as a relay station, a relay base station, a relay, or the like.

[0032] Wireless network 100 can be a heterogeneous network that includes BSs of different types, such as macro BSs, pico BSs, femto BSs, relay BSs, or the like. These different types of BSs can have different transmit power levels, different coverage areas, and different impacts on interference in wireless network 100. For example, macro BSs can have a high transmit power level (e.g., 5 to 40 watts) whereas pico BSs, femto BSs, and relay BSs can have relatively lower transmit power levels (e.g., 0.1 to 2 watts).

[0033] A network controller 130 can couple to a set of BSs and can provide coordination and control for these BSs. Network controller 130 can communicate with the BSs via a backhaul. The BSs can also communicate with one another, e.g., directly or indirectly via a wireless or wireline backhaul.

[0034] UEs 120 (e.g., 120a, 120b, 120c) can be dispersed throughout wireless network 100, and each UE can be stationary or mobile. A UE can also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, etc. A UE can be a cellular phone (e.g., 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, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicular component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.

[0035] Some UEs can be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags, that can communicate with a base station, 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, and / or can be implemented as NB-IoT (narrowband

[0036] In general, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a particular RAT and can operate on one or more frequencies. A RAT can also be referred to as a radio technology, an air interface, and / or the like. Frequencies can also be referred to as carriers, frequency channels, and / or the like. Each frequency can support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0037] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) can communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary to communicate with one another). For example, UE 120 can perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110. Some communications between UEs 120 can be referred to as “vehicle-to- everything” (V2X) communications. For example, V2X communications can include

[0038] Devices of wireless network 100 can communicate using the electromagnetic spectrum, which can be subdivided by frequency or wavelength into various classes, bands, channels, and so on. For example, devices of wireless network 100 can communicate using an operating band having a first frequency range (FR1), which can span from 410 MHz to 7.125 GHz, and / or can communicate using an operating band having a second frequency range (FR2), which can span from 24.25 GHz to 52.6 GHz. The frequencies between FR1 and FR2 are sometimes referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to as a “sub-6 GHz” band. Similarly, FR2 is often referred to as a “millimeter wave” band despite being different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) identified by the International Telecommunications Union (ITU) as a “millimeter wave” band. Thus, unless specifically stated otherwise, it will be understood that the term “sub-6 GHz” or like references, if used herein, can broadly represent frequencies less than 6 GHz, frequencies within FR1, and / or mid-band frequencies (e.g., greater than 7.125 GHz). Similarly, unless specifically stated otherwise, it will be understood that the term “millimeter wave” or like references, if used herein, can broadly represent frequencies within the EHF band, frequencies within FR2, and / or mid-band frequencies (e.g., less than 24.25 GHz). It is contemplated that the frequencies included in FR1 and FR2 can be modified, and techniques described herein are applicable to those modified frequency ranges.

[0039] As indicated above, Figure 1 are provided as examples. Other examples can differ from what is described with respect to at least one of the following. Figure 1

[0040] Figure 2 is a diagram illustrating an example 200 in which a base station 110 is in communication with a UE 120 in a wireless network 100, in accordance with various aspects of the present disclosure. The base station 110 can be equipped with T antennas 234a through 234t, and the UE 120 can be equipped with R antennas 252a through 252r, where generally T > 1 and R > 1.

[0041] ​At base station 110, a transmit processor 220 can receive data from a data source 212 for one or more UEs, select one or more modulation and coding schemes (MCSs) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS(s) selected for the UE, and provide data symbols for all UEs. Transmit processor 220 can also process system information (e.g., for semi-static resource partitioning information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper layer signaling) and provide overhead symbols and control symbols. Transmit processor 220 can also generate reference symbols for reference signals (e.g., a cell-specific reference signal (CRS) or a demodulation reference signal (DMRS)) and synchronization signals (e.g., a primary synchronization signal (PSS) or a 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, the overhead symbols, and / or the reference symbols, if applicable, and can provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 can process a respective output symbol stream (e.g., for OFDM) to obtain an output sample stream. Each modulator 232 can further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. T downlink signals from modulators 232a through 232t can be transmitted via T antennas 234a through 234t, respectively.

[0042] At UE 120, antennas 252a through 252r can receive the downlink signals from base station 110 and / or other base stations and can provide received signals to demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 can condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples. Each demodulator 254 can further process the input samples (e.g., for OFDM) to obtain received symbols. A MIMO detector 256 can obtain received symbols from all R 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 and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller / processor 280. The term “controller / processor” can refer to one or more controllers, one or more processors, or combinations thereof. A channel processor can determine reference signal received power (RSRP) parameters, received signal strength indicator (RSSI) parameters, reference signal received quality (RSRQ) parameters, and / or channel quality indicator (CQI) parameters, among other examples. In some aspects, one or more components of UE 120 can be included in a housing 284.

[0043] Network controller 130 can include communication unit 294, controller / processor 290, and memory 292. Network controller 130 can include, for example, one or more devices in a core network. Network controller 130 can communicate with base station 110 via communication unit 294.

[0044] On the uplink, at UE 120, a transmit processor 264 can receive and process data from a data source 262 and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, and / or CQI) from controller / processor 280. Transmit processor 264 can also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 can be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to base station 110. In some aspects, a modulator and a demodulator (e.g., MOD / DEMOD 254) of the UE 120 can be included in a modem of the UE 120. In some aspects, the UE 120 includes a transceiver. The transceiver can include any combination of antennas 252, modulators and / or demodulators 254, MIMO detector 256, receive processor 258, transmit processor 264, and / or TX MIMO processor 266. The transceiver can be used by a processor (e.g., controller / processor 280) and memory 282 to perform any of the methods described herein, for example, as described with reference to FIGs. Figures 3-7

[0045] At base station 110, the uplink signals from UE 120 and other UEs can be received by antennas 234, processed by 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 UE 120. Receive processor 238 can provide the decoded data to a data sink 239 and the decoded control information to controller / processor 240. Base station 110 can include communication unit 244 and communicate to network controller 130 via communication unit 244. Base station 110 can include a scheduler 246 to schedule UEs 120 for downlink and / or uplink communications. In some aspects, a modulator and a demodulator (e.g., MOD / DEMOD 232) of the base station 110 can be included in a modem of the base station 110. In some aspects, the base station 110 includes a transceiver. The transceiver can include any combination of antennas 234, modulators and / or demodulators 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The transceiver can be used by a processor (e.g., controller / processor 240) and memory 242 to perform any of the methods described herein, for example, as described with reference to FIGs. Figures 3-7

[0046] ​​The controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component may perform one or more techniques associated with handover between sidelink bandwidth portions (SL-BWP), as described in more detail elsewhere herein. For example, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component(s) may execute or direct, for example Figure 6 The operation of process 600 and / or other processes as described herein. Memory 242 and 282 may store data and program code for use by base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include: a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, when executed by one or more processors of base station 110 and / or UE 120 (e.g., direct execution, or execution after compilation, transformation, and / or interpretation), the one or more processors, UE 120, and / or base station 110 may cause the one or more processors, UE 120, and / or base station 110 to perform or direct, for example... Figure 6 The process 600 and / or other processes as described herein. In some aspects, the execution instructions may include run instructions, translate instructions, compile instructions, and / or interpret instructions, etc.

[0047] In some aspects, the first UE includes: means for transmitting to a second UE in side-link communication with the first UE an indication to switch from using the first SL-BWP to using the second SL-BWP; and means for selectively switching from using the first SL-BWP to using the second SL-BWP, at least in part based on receiving a positive confirmation message from the second UE. Means for the first UE to perform the operations described herein may include, for example, one or more of antenna 252, demodulator 254, MIMO detector 256, receiver processor 258, transmitter processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, or memory 282.

[0048] In some respects, the first UE includes means for receiving a confirmation message from the second UE.

[0049] In some aspects, the first UE includes means for mapping communications associated with the second SL-BWP to resources associated with the first SL-BWP for receiving affirmative reception messages.

[0050] In some respects, the first UE includes means for retransmitting the indication to the second UE if it does not receive a positive confirmation message from the second UE.

[0051] Although Figure 2 The blocks in FIG. 10 are illustrated as distinct components, but the functionality described above in relation to these blocks can be implemented in a single hardware, software, or combined component or a combination of various components. For example, the functionality described in relation to transmit processor 264, receive processor 258, and / or TX MIMO processor 266 can be performed by controller / processor 280 or under the control of controller / processor 280.

[0052] As indicated above, Figure 2 are provided as examples. Other examples can differ from what is described in relation to Figure 2 FIG. 10.

[0053] A sidelink network can include a base station and a plurality of UEs. The base station can communicate with each of the plurality of UEs via respective access links. The plurality of UEs can operate in a sidelink mode to communicate (e.g., transmit and / or receive data) with each other via one or more sidelink channels.

[0054] In one sidelink mode (e.g., a mode 1 resource allocation mode), a base station can configure and control utilization of sidelink resources (e.g., radio interface resources, such as frequency resources and / or time resources) available for sidelink communications. For example, the base station can configure a predetermined number of sidelink resources associated with a sidelink channel, and a transmitting UE can utilize the predetermined number of sidelink resources to transmit data to a receiving UE on the sidelink channel. In some aspects, the base station can use the transmitting UE as a relay device to extend coverage to the receiving UE, which can experience poor coverage due to, for example, poor radio link quality.

[0055] In another sidelink mode (e.g., a mode 2 resource allocation mode), a base station can configure a predetermined number of sidelink resources available for sidelink communications. The plurality of UEs, rather than the base station, can control use of the predetermined number of sidelink resources by performing scheduling of communications in the sidelink network. For example, a transmitting UE can autonomously schedule utilization of the predetermined number of sidelink resources to transmit data to a receiving UE.

[0056] In either sidelink mode, each of the plurality of UEs in the sidelink network can utilize a fixed amount of bandwidth due to utilizing a predetermined number of sidelink resources. The transmitting UEs can perform transmission operations associated with utilizing the predetermined number of sidelink resources for each transmission utilizing a threshold amount of processing power, including when the transmitting UEs transmit a nominal amount of data. Similarly, the receiving UEs can perform reception operations associated with utilizing the predetermined number of sidelink resources for each reception utilizing a threshold amount of processing power, including when the receiving UEs receive a nominal amount of data. As a result, each of the plurality of UEs can perform communication operations (e.g., transmission or reception operations) associated with utilizing the predetermined number of sidelink resources for each communication utilizing a threshold amount of processing power, regardless of the amount of data to be communicated.

[0057] Some UEs can be designed to obtain efficient power consumption. Examples of such UEs include MTC UEs and / or NB-IoT devices, which can be deployed in the field to perform, for example, infrequent and / or simple communication tasks, and can be provided with a single-charged battery solution. Additional examples include peripheral devices, such as bio-sensors / devices or wearable devices (e.g., smart watches, smart clothing, smart glasses, smart rings, smart bands, etc.) that are sensitive to excessive power consumption. For such UEs, which can benefit from power consumption reduction techniques, it can be impractical to perform communication operations associated with utilizing the predetermined number of sidelink resources for each communication utilizing a threshold amount of processing power.

[0058] Furthermore, because the plurality of UEs can not adjust the number of utilized sidelink resources (e.g., reduce the number of utilized sidelink resources for transmitting / receiving, for example, a nominal amount of data), the plurality of sidelink resources can remain unused during communication of the nominal amount of data. As a result, resource utilization in the sidelink network can present inefficiencies.

[0059] Various aspects of the techniques and apparatuses described herein can provide for switching between SL-BWPs associated with sidelink communications. In a sidelink network including a plurality of UEs, a transmission from a transmitting UE can be received by one or more other UEs (e.g., receiving UEs) of the plurality of UEs. As described herein, switching between SL-BWPs can assist the transmitting UE in adjusting a number of utilized sidelink resources to enable efficient utilization thereof. In some aspects, the SL-BWPs can have varying bandwidths, which can enable the transmitting UE to adjust the number of utilized sidelink resources based at least in part on an amount of data to be communicated. For example, in transmitting a nominal amount of data, the transmitting UE can be caused to utilize a first SL-BWP having a smaller bandwidth (e.g., a smaller number of sidelink resources) relative to a second SL-BWP, thereby allowing sidelink resources associated with the second SL-BWP to remain available for other purposes. Based at least in part on the efficient utilization of sidelink resources, the transmitting and receiving UEs can reduce power consumption associated with performing communication operations. For example, a transmitting UE and a receiving UE utilizing, for example, a first SL-BWP to communicate a nominal amount of data can expend less than a threshold amount of processing power to perform communication operations associated with utilizing a predetermined number of sidelink resources. In this way, the plurality of UEs can achieve optimized resource utilization and optimized power consumption in communicating in the sidelink network.

[0060] In some aspects, the first UE can transmit, to a second UE in sidelink communication with the first UE, an indication to switch from utilizing the first SL-BWP to utilizing the second SL-BWP, and can selectively switch from utilizing the first SL-BWP to utilizing the second SL-BWP based at least in part on receiving a positive acknowledgement message from the second UE.

[0061] Figure 3is a diagram illustrating an example 300 related to switching between SL-BWPs in accordance with various aspects of the present disclosure. Sidelink communications can occur in a sidelink network including a transmitter (TX) 310 and multiple UEs (shown as UE 305-1, UE 305-2, and UE 305-3). The TX 310 can include, for example, a base station (e.g., BS 110) or a relay device. A relay device can include a network node such as, for example, a relay BS, a relay UE, and / or an integrated access and backhaul (IAB) node. Access link communications can be transmitted and received via an access link. For example, the TX 310 can communicate with UE 305-1 via a first access link, with UE 305-2 via a second access link, and / or with UE 305-3 via a third access link. In some aspects, the access links between the TX 310 and the UEs (e.g., UE 305-1, UE 305-2, or UE 305-3) can be implemented with, for example, a Uu interface.

[0062] Sidelink communications can be transmitted and received via a sidelink channel. As Figure 3 indicated above, the UEs 305-1, 305-2, and 305-3 (collectively referred to as UEs 305) can communicate via one or more sidelink channels to communicate with one another (e.g., transmit and / or receive data). In some aspects, the one or more sidelink channels between the UEs 305 can be implemented with, for example, a PC5 interface. In a sidelink network, a transmitting UE can communicate with one or more of the other multiple UEs (e.g., receiving UEs). The UEs 305 can include one or more UEs described elsewhere herein, such as the UEs 120 discussed with reference to FIG. 1. Figure 2

[0063] As indicated above, Figure 3 is provided as an example. Other examples can differ from what is described with Figure 3 respect to the example described with reference to FIG. 3.

[0064] Figure 4 ​is a diagram illustrating example 400 associated with switching between SL-BWPs, in accordance with various aspects of the present disclosure. Sidelink communications can occur in a sidelink network including multiple UEs, including UE 405-1 and UE 405-2, for example, communicating with each other using one or more sidelink channels. In some aspects, more than two UEs can be included in the sidelink network. The multiple UEs included in the sidelink network can include multiple UEs within a given geographic area (e.g., a given radius around a given UE). In some aspects, the multiple UEs included in the sidelink network can provide a UE density associated with the sidelink network. For example, the UE density can identify a number of UEs within a threshold distance of, for example, UE 405-1. In some aspects, UE 405-1 and / or UE 405-2 (collectively, UEs 405) can include one or more UEs described elsewhere herein, such as with respect to Figure 2 the UE 120 discussed and / or with respect to Figure 3 the UE 305 discussed.

[0065] As shown in Figure 4 UE 405-1 can communicate with UE 405-2 via a sidelink channel. Communications utilizing the one or more sidelink channels can include P2P communications, D2D communications, V2X communications (e.g., V2V communications, V2I communications, and / or vehicle-to-person (V2P) communications), and / or mesh network communications, for example.

[0066] In some aspects, the sidelink channel can use a PC5 interface and / or can operate in a high frequency band (e.g., a 5.9 GHz band) and / or an unlicensed or shared frequency band (e.g., an NR-unlicensed (NR-U) band), for example. Additionally, or alternatively, UEs 405-1, 405-2 can synchronize timing of transmission time intervals (TTIs) (e.g., frames, subframes, slots, and / or symbols) using global navigation satellite system (GNSS) timing.

[0067] As shown in Figure 4Further shown, the sidelink channels can include, for example, a physical sidelink broadcast channel (PSBCH) 410, a physical sidelink control channel (PSCCH) 415, a physical sidelink shared channel (PSSCH) 420, and / or a physical sidelink feedback channel (PSFCH) 425. The PSBCH 410 can be used to convey a sidelink synchronization (SYNC) signal. The PSCCH 415 can be used to convey control information, similar to a physical downlink control channel (PDCCH) and / or a physical uplink control channel (PUCCH) used for cellular communications with a transmitter (e.g., TX 310) via an access link or access channel. In some aspects, a transmitting UE can use the PSCCH 415 to transmit, and a receiving UE can use the PSCCH 415 to receive, information associated with switching between SL-BWPs (e.g., switching information). The PSSCH 420 can be used to convey data, similar to a physical downlink shared channel (PDSCH) and / or a physical uplink shared channel (PUSCH) used for cellular communications with a transmitter (e.g., TX 310) via an access link or access channel. In some aspects, a transmitting UE can use the PSSCH 420 to transmit, and a receiving UE can use the PSSCH 420 to receive, information associated with switching between SL-BWPs (e.g., switching information).

[0068] The sidelink channels can carry sidelink control information (SCI) to indicate various control information for sidelink communications. The sidelink control information can include, for example, a sidelink control information part 1 (SCI-1) 430 and a sidelink control information part 2 (SCI-2) 435. The SCI-1 430 can be included in the PSCCH 415 and the SCI-2 435 can be included in the PSSCH 420. The SCI-1 430 can include switching information, scheduling assignments for one or more resources (e.g., time resources, frequency resources, and / or spatial resources) of the sidelink channels, and / or the like. In some aspects, the SCI-1 430 can be used to carry one or more feedback messages (e.g., positive acknowledgement messages, negative acknowledgement messages, and / or the like) associated with utilization of the SL-BWPs. The SCI-2 435 can include various types of information, such as, for example, switching information, a hybrid automatic repeat request (HARQ) process ID, a new data indicator (NDI) associated with data 440, a unique identifier associated with a transmitting UE (unique TX ID), a unique identifier associated with a receiving UE (unique RX ID), and / or a channel state information (CSI) report trigger. In some aspects, the SCI-2 435 can be used to carry one or more feedback messages (e.g., positive acknowledgement messages, negative acknowledgement messages, and / or the like) associated with utilization of the SL-BWPs.

[0069] The PSSCH 420 can also include data 440 and information such as, for example, information for decoding a sidelink communication on the PSSCH 420, a quality of service (QoS) priority value, a resource reservation period, a PSSCH demodulation reference signal (DMRS) pattern, a SCI format and / or a beta offset for a sidelink control information part 2 (SCI-2) 435 transmitted on the PSSCH 420, a PSSCH DMRS port number, a medium access control (MAC) message including a MAC control element (MAC-CE), and / or a modulation coding scheme (MCS). The MAC-CE can be used to convey, for example, switching information associated with switching between SL-BWPs. Additionally or alternatively, the MAC-CE can be used to convey feedback messages associated with utilizing SL-BWPs configured for a sidelink network. For example, the MAC-CE can be used to convey positive acknowledgement messages, negative acknowledgement messages, and / or the like associated with utilizing SL-BWPs.

[0070] In some aspects, the UE 405-1 can transmit both the SCI-1 430 and the SCI-2 435. In some aspects, the UE 405-1 can transmit only the SCI-1 430, in which case one or more types of information that would otherwise be transmitted in the SCI-2 435 can instead be transmitted in the SCI-1 430. The PSFCH 425 can be used to convey sidelink (SL) feedback 445 such as, for example, HARQ feedback messages (e.g., acknowledgement or negative acknowledgement (ACK / NACK) information), transmit power control (TPC), and / or scheduling requests (SRs).

[0071] In some aspects, the one or more sidelink channels can use configured sidelink resources (e.g., configured by the TX 310) that are shared by the plurality of UEs. In some aspects, a particular resource block (RB) can be used across time to transmit a scheduling assignment (e.g., included in the SCI-1 430) in a subchannel. In some aspects, data 440 associated with the scheduling assignment (e.g., on the PSSCH 420) can occupy adjacent RBs in the same subframe as the scheduling assignment (e.g., using frequency division multiplexing). In some aspects, the scheduling assignment and associated data transmission can be transmitted using non-adjacent RBs.

[0072] Configured sidelink resources can include resource blocks, sub-channels, resource pools, sidelink bandwidth parts (SL-BWPs), and / or the like. Resource blocks, sub-channels, resource pools, and / or sidelink bandwidth parts (SL-BWPs) can be resources in the frequency domain and can be described with respect to a starting frequency and a bandwidth, and / or can be associated with a subcarrier spacing. In some aspects, a sub-channel can include one or more resource blocks, a resource pool can include one or more sub-channels, and / or a SL-BWP can include one or more resource pools. In some aspects, a transmitter (e.g., TX 310) can configure a sidelink network with one or more SL-BWPs to facilitate sidelink communications (e.g., transmitting and / or receiving data) utilizing sidelink resources. Each UE of the plurality of UEs can utilize the one or more configured SL-BWPs to transmit data to and / or receive data from a receiver UE in the sidelink network. In some aspects, resource requirements of the sidelink network can vary over time. In some aspects, resource requirements of the sidelink network can vary based at least in part on a number of UEs included in the sidelink network. Also, as disclosed herein, descriptions regarding BWPs can similarly apply to resource pools. For example, a UE can similarly switch from utilizing a first configured resource pool to utilizing another configured resource pool. Figure 5 As discussed in further detail, the plurality of UEs can switch from utilizing a first configured SL-BWP to utilizing another configured SL-BWP. As disclosed herein, descriptions regarding BWPs can similarly apply to resource pools. For example, a UE can similarly switch from utilizing a first configured resource pool to utilizing another configured resource pool.

[0073] As indicated above, Figure 4 are provided as examples. Other examples can differ from what is described with respect to at least one of the described examples. Figure 4

[0074] Figure 5 FIG. 5 is a diagram illustrating an example 500 associated with switching between SL-BWPs associated with sidelink communications, in accordance with various aspects of the present disclosure. Figure 5 UEs 510 and 520 (collectively referred to as UEs 510, 520) are shown engaged in sidelink communications in a sidelink network. The sidelink network can include a plurality of UEs (including UEs 510, 520) engaged in sidelink communications with one another. Sidelink communications can include data communications (e.g., transmissions and / or receptions) via one or more sidelink channels. In some aspects, the one or more sidelink channels can be implemented utilizing, for example, a PC5 interface. In the sidelink network, a transmitting UE (e.g., UE 510) can communicate with one or more other receiving UEs (e.g., UE 520). UEs 510, 520 can include one or more UEs described elsewhere herein, such as the UEs 120 discussed with respect to Figure 2 and / or the UEs 305 discussed with respect to Figure 3 and / or the UEs 305 discussed with respect to​Figure 4 the UE 405.

[0075] In some aspects, the UEs 510, 520 can operate in a sidelink mode (e.g., a mode 1 resource allocation mode), for example, in which a BS (not shown in FIG. 5) can configure and control utilization of sidelink resources in the sidelink network. Alternatively, the UEs 510, 520 can operate in a sidelink mode (e.g., a mode 2 resource allocation mode) in which the UEs 510, 520 control utilization of sidelink resources in the sidelink network. Figure 5

[0076] As shown by reference number 530, at the start of and / or during the sidelink communication, the UE 510 can transmit and the UE 520 can receive configuration information. In some aspects, the UE 510 can function as a relay device that transmits the configuration information to the UE 520. In some aspects, the UE 510 can transmit and the UE 520 can receive the configuration information via, for example, a PSCCH (e.g., the PSCCH 415) or a PSSCH (e.g., the PSSCH 420). For example, as discussed in further detail below, the UE 510 can transmit and the UE 520 can receive the configuration information via SCI-1 (e.g., the SCI-1 430) transmitted on the PSCCH, or via SCI-2 (e.g., the SCI-2 435) or a MAC-CE transmitted on the PSSCH. In some aspects, the UE 510 can transmit the configuration information to a given UE (e.g., the UE 520) via unicast sidelink communication, and / or to a group of UEs via groupcast sidelink communication, and / or to multiple UEs in the sidelink network via broadcast sidelink communication.

[0077] In some aspects, the configuration information can include information associated with configured sidelink resources (e.g., frequency resources (sub-channels)) to be used by the UEs 510, 520 for the sidelink communication. For example, the configuration information can include information (e.g., resource allocation information) associated with configured SL-BWPs to be used by the UEs 510, 520 for the sidelink communication. In some aspects, the configured SL-BWPs can be associated with varying bandwidths (e.g., varying numbers of sidelink resources). For example, a first SL-BWP from among the configured SL-BWPs can be associated with a first number of sidelink resources, and a second SL-BWP from among the configured SL-BWPs can be associated with a second number of sidelink resources. In some aspects, the second number of sidelink resources can be less than the first number of sidelink resources. As described herein, switching between the first and second SL-BWPs can facilitate efficient utilization of sidelink resources.

[0078] ​As shown by reference number 540, the configuration information can include switching information associated with switching between the configured SL-BWPs. As shown by reference numbers 550 and 560, the UE 510, 520 can configure the UE 510, 520 to switch between the configured SL-BWPs based at least in part on the switching information. In some aspects, the UE 510, 520 can configure the UE 510, 520 to dynamically switch between the configured SL-BWPs. In some aspects, the UE 510, 520 can configure the UE 510, 520 to dynamically switch from utilizing, for example, the first SL-BWP to utilizing, for example, the second SL-BWP.

[0079] In some aspects, the switching information can include an indication for the UE 520 to switch from utilizing the first SL-BWP to utilizing the second SL-BWP. In some aspects, the indication can include, for example, an identifier to identify the first SL-BWP and / or an identifier to identify the second SL-BWP, which can assist the UE 520 to switch from utilizing the first SL-BWP to utilizing the second SL-BWP. In some aspects, the UE 510 can transmit and the UE 520 can receive the indication by utilizing one or more resources associated with the first SL-BWP, which can be an active SL-BWP that the UE 510, 520 is actively using for sidelink communications. In some aspects, the UE 510 can transmit and the UE 520 can receive data (e.g., along with the indication) by utilizing one or more resources associated with the first SL-BWP.

[0080] In some aspects, the UE 510 can transmit and the UE 520 can receive the indication via SCI-1 transmitted on a PSCCH. In some aspects, the UE 510 can transmit and the UE 520 can receive the indication via SCI-2 transmitted on a PSSCH. In some aspects, the UE 510 can transmit and the UE 520 can receive the indication via a MAC-CE transmitted on a PSSCH.

[0081] In a case that the PSFCH is configured for a resource pool associated with the first SL-BWP, the UE 520 can transmit and the UE 510 can receive a HARQ feedback message utilizing the configured PSFCH. The UE 510 receiving the HARQ feedback message can be used to inform the UE 510 that the indication was received by the UE 520. The HARQ feedback message can include a positive acknowledgement message (e.g., ACK) or a negative acknowledgement message (e.g., NACK).

[0082] When the UE 510 receives the negative acknowledgement message, the UE 510 can determine that the UE 520 is unable, or has declined, to switch from utilizing the first SL-BWP to utilizing the second SL-BWP. In some aspects, the UE 520 can be unable, or can decline, to switch from utilizing the first SL-BWP to utilizing the second SL-BWP because, for example, the UE 520 can be utilizing one or more resources associated with the second SL-BWP for a sidelink communication with another UE, and the UE 510 can be unaware of such sidelink communication between the UE 520 and another UE. In this case, the UEs 510, 520 can not switch from utilizing the first SL-BWP to utilizing the second SL-BWP. In some aspects, based at least in part on receiving the negative acknowledgement message, the UE 510 can retransmit the indication at a later time.

[0083] When the UE 510 receives the positive acknowledgement message, as shown by reference numbers 570 and 580, the UEs 510, 520 can switch from utilizing the first SL-BWP to utilizing the second SL-BWP. In some aspects, the UEs 510, 520 can switch from utilizing the first SL-BWP to utilizing the second SL-BWP based at least in part on the UE 520 receiving the indication transmitted by the UE 510 and / or the UE 510 receiving the positive acknowledgement message transmitted by the UE 520. In some aspects, the UEs 510, 520 can switch from utilizing the first SL-BWP to utilizing the second SL-BWP after a predetermined time duration after the UE 510 transmits the indication. The length of the predetermined time duration can be long enough to account for an amount of time associated with the UE 520 transmitting (and the UE 510 receiving) the HARQ feedback message after receiving the indication transmitted by the UE 510. In some aspects, the length of the predetermined time duration can be preconfigured by a BS.

[0084] In some aspects, when the UE 510 transmits the indication via PSSCH (e.g., SCI-2 and / or a MAC-CE), receiving a positive acknowledgement message by the UE 510 prior to the UEs 510, 520 switching from utilizing the first SL-BWP to utilizing the second SL-BWP can be necessary. The reception of the positive acknowledgement message can inform the UE 510 that the UE 520 has sufficiently received and decoded the PSSCH to receive the indication.

[0085] In some aspects, UE 510 can fail to receive the positive acknowledgement message transmitted by UE 520 due to, for example, interference in the sidelink communication. In this case, UE 510 can continue to utilize the first SL-BWP, while UE 520 can switch to utilizing the second SL-BWP. In some aspects, UE 520 can transmit data and / or retransmit the positive acknowledgement message to UE 510 utilizing one or more resources associated with the second SL-BWP. As such, the sidelink communication between UEs 510, 520 can experience an interruption. To avoid such an interruption, the transmission (e.g., data transmission) utilizing the one or more resources associated with the second SL-BWP can be mapped with a feedback resource (e.g., a configured PSFCH) associated with the first SL-BWP. The feedback resource can include a slot, a slot offset, a resource block, and / or the like. In this way, UE 510, while utilizing the first SL-BWP, can receive a feedback message indicating that UE 520 has switched to utilizing the second SL-BWP. UE 510 can then also switch to utilizing the second SL-BWP to continue the sidelink communication with UE 520 utilizing the second SL-BWP. When the transmission utilizing the one or more resources associated with the second SL-BWP is not mapped with the feedback resource associated with the first SL-BWP, UE 510 can retransmit the indication utilizing one or more resources associated with the first SL-BWP.

[0086] In the case that PSFCH is not configured for the resource pool associated with the first SL-BWP, UE 510 can fail to receive the HARQ feedback message transmitted by UE 520. In this case, UE 520 can transmit and UE 510 can receive a positive acknowledgement message or a negative acknowledgement message via SCI-1 transmitted by UE 520 to UE 510 on PSCCH, via SCI-2 transmitted by UE 520 to UE 510 on PSSCH, and / or via a MAC-CE transmitted by UE 520 to UE 510 on PSSCH.

[0087] In some aspects, the UE 510, 520 can switch from utilizing the first SL-BWP to utilizing the second SL-BWP without receiving a positive acknowledgement message. For example, the UE 510, 520 can switch from utilizing the first SL-BWP to utilizing the second SL-BWP based at least in part on a fixed time duration expiring after the UE 510 transmits the indication. In some aspects, the UE 510 can transmit information associated with the fixed time duration with the indication to enable the UE 520 to switch from utilizing the first SL-BWP to utilizing the second SL-BWP based at least in part on the fixed time duration expiring. In some aspects, prior to the fixed time duration expiring, the UE 510 can receive data transmitted by the UE 520 by utilizing one or more resources associated with the first SL-BWP. Such data reception can inform the UE 510 that the UE 520 failed to receive the transmitted indication to switch. Alternatively, such data reception can serve as an implicit negative acknowledgement message to inform the UE 510 that the UE 520 is unable or has refused to switch from utilizing the first SL-BWP to utilizing the second SL-BWP. In this case, the UE 510 can not switch to utilizing the second SL-BWP and can retransmit the indication to the UE 520 at a later time.

[0088] In some aspects, the UE 510 can engage in sidelink communications with multiple UEs. In an example, the UE 510 can transmit the indication to a first UE (e.g., the UE 520) via a first unicast sidelink communication and can separately transmit the indication to a second UE via a second unicast sidelink communication. In this case, the UE 510 can act as a relay UE responsible for supporting the first UE and / or the second UE. In some aspects, the relay UE can generate the indication. In some aspects, the relay UE can receive the indication from the TX 510.

[0089] Alternatively, the UE 510 can transmit a single indication to a group of UEs among a plurality of UEs included in the sidelink network via a groupcast sidelink communication. Alternatively, the UE 510 can transmit a single indication to the plurality of UEs included in the sidelink network via a broadcast sidelink communication. In some aspects, the UE 510 can transmit information associated with a fixed time duration and / or information associated with a configuration of feedback resources to the group of UEs and / or the plurality of UEs with the single indication. One or more UEs included in the group of UEs and / or the plurality of UEs can transmit a positive acknowledgement message and can switch to utilizing the second SL-BWP based at least in part on the fixed time duration expiring.

[0090] As shown by reference number 590, based at least in part on switching to utilize the second SL-BWP, the UE 510, 520 (and / or the UE group and / or the plurality of UEs) can communicate sidelink communications. The UE 510, 520 can communicate sidelink communications by utilizing included transmission circuitry and / or reception circuitry. The transmission circuitry can include, for example, one or more of the components discussed with respect to Figure 2 the transmitter processor 264, TX MIMO processor 266, modulator 254, and / or antenna 252, and the reception circuitry can include, for example, one or more of the components discussed with respect to the receiver processor 258, MIMO detector 256, demodulator 254, and / or antenna 252.

[0091] As described herein, techniques and apparatuses associated with switching between SL-BWPs can assist a UE in dynamically switching from utilizing a first SL-BWP to utilizing a second SL-BWP, the first SL-BWP being associated with a different bandwidth relative to the second SL-BWP. As a result, the UE can be enabled to efficiently utilize sidelink resources based at least in part on an amount of data to be communicated. Additionally, based at least in part on efficiently utilizing sidelink resources, a UE designed for efficient power consumption can reduce power consumption associated with performing communication operations. In this way, the UE can achieve optimized resource utilization and optimized power consumption when communicating in a sidelink network.

[0092] As indicated above, Figure 5 are provided by way of example. Other examples can differ from what is described with respect to at least one of the Figure 5 described examples.

[0093] Figure 6 is a diagram illustrating an example process 600 performed, for example, by a first UE (e.g., UE 120, UE 305, UE 405, UE 510), in accordance with various aspects of the present disclosure. Example process 600 is an example where the UE performs operations associated with switching between SL-BWPs.

[0094] As Figure 6 shown in FIG. 15, in some aspects, process 600 can include the first UE transmitting, to a second UE in sidelink communication with the first UE, an indication to switch from utilizing a first SL-BWP to utilizing a second SL-BWP (block 610). For example, the first UE (e.g., using transmission component 704, as Figure 7 depicted in FIG. 7) can transmit, to a second UE in sidelink communication with the first UE, an indication to switch from utilizing a first SL-BWP to utilizing a second SL-BWP, as described above.

[0095] As Figure 6As further shown in FIG. 6, in some aspects process 600 can include selectively switching, by the first UE, from utilizing the first SL-BWP to utilizing the second SL-BWP based at least in part on receiving the positive acknowledgement message from the second UE (block 620). For example, the first UE (e.g., using switching component 708, as described above in connection with FIG. 7) can selectively switch from utilizing the first SL-BWP to utilizing the second SL-BWP based at least in part on receiving the positive acknowledgement message from the second UE, as described above. Figure 7 As further shown in FIG. 6, in some aspects process 600 can include selectively switching, by the first UE, from utilizing the first SL-BWP to utilizing the second SL-BWP based at least in part on receiving the positive acknowledgement message from the second UE (block 620). For example, the first UE (e.g., using switching component 708, as described above in connection with FIG. 7) can selectively switch from utilizing the first SL-BWP to utilizing the second SL-BWP based at least in part on receiving the positive acknowledgement message from the second UE, as described above.

[0096] Process 600 can include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.

[0097] In a first aspect, process 600 includes receiving, from a second UE, a positive acknowledgement message.

[0098] In a second aspect, alone or in combination with the first aspect, selectively switching includes switching from utilizing the first SL-BWP to utilizing the second SL-BWP based at least in part on a gap time duration after transmitting the indication.

[0099] In a third aspect, alone or in combination with one or more of the first and second aspects, the first SL-BWP is an active SL-BWP being used for sidelink communications by the first UE and the second UE.

[0100] In a fourth aspect, alone or in combination with one or more of the first through third aspects, transmitting the indication includes transmitting the indication via a physical sidelink control channel (PSCCH).

[0101] In a fifth aspect, alone or in combination with one or more of the first through third aspects, transmitting the indication includes transmitting the indication via a physical sidelink shared channel (PSSCH).

[0102] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, transmitting the indication includes transmitting the indication utilizing resources associated with the first SL-BWP.

[0103] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the switching includes switching from utilizing the first SL-BWP to utilizing the second SL-BWP after a predetermined time duration.

[0104] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the switching includes switching from utilizing the first SL-BWP to utilizing the second SL-BWP after a predetermined time duration, the predetermined time duration based at least in part on an amount of time associated with receiving the positive acknowledgement message from the second UE.

[0105] In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the process 600 includes mapping the communication associated with the second SL-BWP to a resource associated with the first SL-BWP for receiving the positive acknowledgement message.

[0106] In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the process 600 includes retransmitting the indication to the second UE when the positive acknowledgement message is not received from the second UE.

[0107] In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the process 600 includes receiving the positive acknowledgement message via a physical sidelink control channel (PSCCH).

[0108] In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the process 600 includes receiving the positive acknowledgement message via a physical sidelink shared channel (PSSCH).

[0109] In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the process 600 includes receiving the positive acknowledgement message via a medium access control (MAC) message.

[0110] In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the process 600 includes receiving data from the second UE other than the positive acknowledgement message prior to expiration of the gap time duration.

[0111] In a fifteenth aspect, alone or in combination with one or more of the first through fourteenth aspects, the process 600 includes transmitting the indication to a third UE in sidelink communication with the first UE.

[0112] Although Figure 6 Example blocks of the process 600 are illustrated, but in some aspects, the process 600 can include more, fewer, or different blocks than those depicted in Figure 6 Additionally or alternatively, two or more of the blocks of the process 600 can be performed in parallel.

[0113] Figure 7is a block diagram of an example apparatus 700 for wireless communication. The apparatus 700 can be a first UE (e.g., a UE 120, UE 305, UE 405, UE 510), or a first UE can include the apparatus 700. In some aspects, the apparatus 700 includes a reception component 702 and a transmission component 704, which can be in communication with one another (for example, via one or more buses and / or one or more other components). As shown, the apparatus 700 can employ the reception component 702 and the transmission component 704 to communicate with another apparatus 706, such as a UE (for example, UE 520), a base station, or another wireless communication device. As further shown, the apparatus 700 can include a handover component 708, among other examples.

[0114] In some aspects, the apparatus 700 can be configured to perform one or more operations described herein in connection with Figures 3-5 the first UE. Additionally, or alternatively, the apparatus 700 can be configured to perform one or more processes described herein, such as process 600. Figure 6 In some aspects, the apparatus 700 and / or one or more components shown in Figure 7 may include one or more components described above in connection with Figure 2 the first UE. Additionally, or alternatively, one or more components shown in Figure 7 may be implemented within one or more components described above in connection with Figure 2 the first UE. Additionally, or alternatively, one or more components of the set of components can be implemented at least in part as software stored in a memory. For example, a component (or a portion of a component) can be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or a processor to perform the functions or operations of the component.

[0115] The reception component 702 can receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 706. The reception component 702 can provide received communications to one or more other components of the apparatus 700. In some aspects, the reception component 702 can perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples), and can provide the processed signals to the one or more other components of the apparatus 706. In some aspects, the reception component 702 can include one or more antennas, a demodulator, a MIMO detector, a receive processor, a controller / processor, a memory, or a combination thereof, described above in connection with Figure 2 the first UE.

[0116] The transmission component 704 can transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 706. In some aspects, one or more other components of the apparatus 706 can generate communications and can provide the generated communications to the transmission component 704 for transmission to the apparatus 706. In some aspects, the transmission component 704 can perform signal processing on the generated communications, such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, coding, interleaving, or any combination thereof, and can transmit the processed signals to the apparatus 706. In some aspects, the transmission component 704 can include Figure 2 The described one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the first UE. In some aspects, the transmission component 704 can be collocated with the reception component 702 in a transceiver.

[0117] The transmission component 704 can transmit, to a second UE in a sidelink communication with the first UE, an indication to switch from utilizing a first SL-BWP to utilizing a second SL-BWP. The switch component 708 can selectively switch from utilizing the first SL-BWP to utilizing the second SL-BWP based at least in part on receiving a positive acknowledgement message from the second UE.

[0118] The reception component 702 can receive, from the second UE, a positive acknowledgement message.

[0119] The switch component 708 can map communications associated with the second SL-BWP to resources associated with the first SL-BWP for receiving the positive acknowledgement message.

[0120] The transmission component 704 can retransmit the indication to the second UE when the positive acknowledgement message is not received from the second UE.

[0121] Figure 7 The number and arrangement of components shown in FIG. 10 are provided as an example. In practice, there can be additional components, fewer components, different components, or differently arranged components than those shown in FIG. 10. Figure 7 For example, FIG. 10 illustrates that the components of the apparatus 706 can include one or more components of the apparatus 700 of FIG. 7. The components of the apparatus 706 can include, for example, one or more of the components of the apparatus 700 illustrated in FIG. 7, and / or one or more components not shown in FIG. 7. Figure 7 Two or more components shown in FIG. 10 can be implemented within a single component, or a single component shown in FIG. 10 can be implemented as multiple, distributed components. Additionally or alternatively, Figure 7 A set of components (for example, one or more components) in FIG. 10 can perform one or more functions described as being performed by another set of components in FIG. 10. Figure 7 Another set of components in FIG. 10 can perform one or more functions described as being performed by a set of components in FIG. 10. Figure 7 Another set of components in FIG. 10 can perform one or more functions described as being performed by a set of components in FIG. 10.

[0122] An overview of aspects of the present disclosure is provided below:

[0123] Aspect 1: A method of wireless communication performed by a first user equipment (UE), comprising: transmitting, to a second UE in sidelink communication with the first UE, an indication to switch from utilizing a first sidelink bandwidth part (SL-BWP) to utilizing a second SL-BWP; and selectively switching from utilizing the first SL-BWP to utilizing the second SL-BWP based at least in part on receiving a positive acknowledgement message from the second UE.

[0124] Aspect 2: The method of aspect 1, further comprising: receiving the positive acknowledgement message from the second UE utilizing the first SL-BWP.

[0125] Aspect 3: The method of any of aspects 1-2, wherein selectively switching comprises switching from utilizing the first SL-BWP to utilizing the second SL-BWP based at least in part on a gap time duration after transmitting the indication.

[0126] Aspect 4: The method of any of aspects 1-3, wherein the first SL-BWP is an active SL-BWP being utilized by the first UE and the second UE for the sidelink communication.

[0127] Aspect 5: The method of any of aspects 1-4, wherein transmitting the indication comprises transmitting the indication via a physical sidelink control channel (PSCCH).

[0128] Aspect 6: The method of any of aspects 1-5, wherein transmitting the indication comprises transmitting the indication via a physical sidelink shared channel (PSSCH), a medium access control - control element (MAC CE), or a sidelink control information part 2 (SCI-2).

[0129] Aspect 7: The method of any of aspects 1-6, wherein transmitting the indication comprises transmitting the indication utilizing resources associated with the first SL-BWP.

[0130] Aspect 8: The method of any of aspects 1-7, wherein the switching comprises switching from utilizing the first SL-BWP to utilizing the second SL-BWP after a predetermined time duration.

[0131] Aspect 9: The method of any of aspects 1-8, wherein the switching comprises switching from utilizing the first SL-BWP to utilizing the second SL-BWP after a predetermined time duration, the predetermined time duration based at least in part on an amount of time associated with receiving the positive acknowledgement message from the second UE.

[0132] Aspect 10: The method of any of aspects 1-9, further comprising: mapping communications associated with the second SL-BWP with resources associated with the first SL-BWP for receiving the positive acknowledgement message.

[0133] Aspect 11: The method of any of aspects 1-10, further comprising retransmitting the indication to the second UE when no positive acknowledgement message is received from the second UE.

[0134] Aspect 12: An apparatus for wireless communication at a device, comprising a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of one or more of aspects 1-11.

[0135] Aspect 13: A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors configured to perform the method of one or more of aspects 1-11.

[0136] Aspect 14: A device for wireless communication, comprising at least one means for performing the method of one or more of aspects 1-11.

[0137] Aspect 15: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more of aspects 1-11.

[0138] Aspect 16: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more of aspects 1-11.

[0139] The foregoing disclosure provides explanation and description to enable a understanding of the aspects, but is not intended to be exhaustive or to limit the aspects to the precise form disclosed. Modifications and variations can be made in light of the above disclosure or can be acquired from practice of the aspects.

[0140] As used herein, the term “component” is intended to be broadly interpreted to encompass hardware and / or a combination of hardware and software. “Software” shall be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, and / or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. As used herein, a processor is implemented in hardware and / or a combination of hardware and software. It will be apparent that systems and / or methods described herein can be implemented in different forms of hardware and / or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems and / or methods is not limiting of the aspects. Thus, the operation and behavior of the systems and / or methods were described herein without reference to specific software code — it being understood that software and hardware can be designed to implement the systems and / or methods based, at least in part, on the description herein.

[0141] As used herein, depending on the context, meeting a threshold can refer to being greater than the threshold, being greater than or equal to the threshold, being less than the threshold, being less than or equal to the threshold, being equal to the threshold, not being equal to the threshold, and / or the like.

[0142] Although specific combinations of features are recited in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many combinations of features can be assumed unless they are specifically excluded in the claims or disclosure. Although each dependent claim listed below can directly depend on only one claim, the disclosure of each aspect includes each dependent claim in combination with every other claim in the set. 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 cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination of multiples of the same element (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).

[0143] No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles “a” and “an” are intended to include one or more items, and can be used interchangeably with “one or more.” Furthermore, as used herein, the article “the” is intended to include one or more items, and can be used interchangeably with “the one or more.” Also, as used herein, the terms “set” and “group” are intended to include one or more items (for example, related items, unrelated items, or a combination of related and unrelated items), and can be used interchangeably with “one or more.” Where only one item is intended, the phrase “only one” or similar language is used. Also, as used herein, the terms “has,” “have,” “having,” or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise. Also, as used herein, the term “or” is intended to be inclusive when used in a series and can be used interchangeably with “and / or,” unless explicitly stated otherwise (e.g., in an exhaustive list of options).

Claims

1. A first user equipment (UE) for wireless communication, comprising: Memory; as well as One or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: Transmit an instruction to a second UE that is in side-link communication with the first UE to switch from using the first side-link bandwidth portion SL-BWP to using the second SL-BWP; The second UE receives a Hybrid Automatic Repeat Request (HARQ) feedback associated with an indication to switch from using the first SL-BWP to using the second SL-BWP. Wherein, when the Physical Side Link Feedback Channel (PSFCH) is configured for a resource pool associated with the first SL-BWP, the first UE utilizing the first SL-BWP receives the HARQ feedback on the PSFCH via one or more resources associated with the second SL-BWP, or the one or more resources associated with the second SL-BWP are mapped to one or more resources associated with the first SL-BWP. When the PSFCH is not configured for the resource pool associated with the first SL-BWP, the HARQ feedback is received via the Sidelink Control Information Part 1SCI-1 on the Physical Sidelink Control Channel PSCCH, the Sidelink Control Information Part 2SCI-2 on the Physical Sidelink Shared Channel PSSCH, or the Media Access Control-Control Element MAC-CE on the PSSCH; and The switch from using the first SL-BWP to using the second SL-BWP is based at least in part on the HARQ feedback.

2. The first UE as claimed in claim 1, wherein the HARQ feedback includes an affirmative reception message.

3. The first UE as claimed in claim 1, wherein the first SL-BWP is an active SL-BWP being used by the first UE and the second UE for the sidelink communication.

4. The first UE as claimed in claim 1, wherein the one or more processors are configured to transmit the indication via the PSCCH when transmitting the indication.

5. The first UE as claimed in claim 1, wherein the one or more processors are configured to transmit the indication via the PSSCH, the MAC-CE, or the SCI-2 when transmitting the indication.

6. The first UE as claimed in claim 1, wherein the one or more processors are configured to transmit the indication using resources associated with the first SL-BWP.

7. The first UE of claim 1, wherein the one or more processors are configured to switch from using the first SL-BWP to using the second SL-BWP after a predetermined time duration when switching from using the first SL-BWP to using the second SL-BWP.

8. The first UE as claimed in claim 7, wherein the predetermined time duration is at least partially based on the amount of time associated with receiving the HARQ feedback from the second UE.

9. The first UE as claimed in claim 1, wherein the one or more processors are further configured to: The communications associated with the second SL-BWP are mapped to one or more resources associated with the first SL-BWP for receiving the HARQ feedback.

10. The first UE as claimed in claim 1, wherein the one or more processors are further configured to: If the initial transmission of the HARQ feedback is not received from the second UE, the instruction is retransmitted to the second UE.

11. The first UE as claimed in claim 1, wherein, When the PSFCH is not configured for the resource pool associated with the first SL-BWP, the HARQ feedback is received via the SCI-1 on the PSCCH.

12. The first UE as claimed in claim 1, wherein, When the PSFCH is not configured for the resource pool associated with the first SL-BWP, the HARQ feedback is received via the SCI-2 on the PSSCH or the MAC-CE on the PSSCH.

13. The first UE as claimed in claim 1, wherein the one or more processors are further configured to: Before the interval time period expires, data other than the HARQ feedback is received from the second UE.

14. The first UE as claimed in claim 1, wherein the one or more processors are configured to transmit the indication to a third UE in sidelink communication with the first UE when transmitting the indication to the second UE.

15. A wireless communication method performed by a first user equipment (UE), comprising: Transmit an instruction to a second UE that is in side-link communication with the first UE to switch from using the first side-link bandwidth portion SL-BWP to using the second SL-BWP; The second UE, utilizing the first SL-BWP, receives a Hybrid Automatic Repeat Request (HARQ) feedback associated with an indication to switch from utilizing the first SL-BWP to utilizing the second SL-BWP. Wherein, when the Physical Side Link Feedback Channel (PSFCH) is configured for a resource pool associated with the first SL-BWP, the first UE utilizing the first SL-BWP receives the HARQ feedback on the PSFCH via one or more resources associated with the second SL-BWP, or the one or more resources associated with the second SL-BWP are mapped to one or more resources associated with the first SL-BWP. When the PSFCH is not configured for the resource pool associated with the first SL-BWP, the HARQ feedback is received via the Sidelink Control Information Part 1SCI-1 on the Physical Sidelink Control Channel PSCCH, the Sidelink Control Information Part 2SCI-2 on the Physical Sidelink Shared Channel PSSCH, or the Media Access Control-Control Element MAC-CE on the PSSCH; and The switch from using the first SL-BWP to using the second SL-BWP is based at least in part on the HARQ feedback.

16. The method of claim 15, wherein the HARQ feedback includes an affirmative acknowledgment message.

17. The method of claim 15, wherein the first SL-BWP is an active SL-BWP being used by the first UE and the second UE for the sidelink communication.

18. The method of claim 15, wherein transmitting the instruction comprises transmitting the instruction via the PSCCH.

19. The method of claim 15, wherein transmitting the instruction comprises transmitting the instruction via the PSSCH, the MAC-CE, or the SCI-2.

20. The method of claim 15, wherein transmitting the instruction comprises using resources associated with the first SL-BWP to transmit the instruction.

21. The method of claim 15, wherein the switch from using the first SL-BWP to using the second SL-BWP occurs after a predetermined time period.

22. The method of claim 21, wherein the predetermined time duration is at least in part based on the amount of time associated with receiving the HARQ feedback from the second UE.

23. The method of claim 15, further comprising: The communications associated with the second SL-BWP are mapped to the resources associated with the first SL-BWP for receiving the HARQ feedback.

24. The method of claim 15, further comprising: If the initial transmission of the HARQ feedback is not received from the second UE, the instruction is retransmitted to the second UE.

25. A non-transient computer-readable medium storing an instruction set for wireless communication, the instruction set comprising: One or more instructions, which, when executed by one or more processors of a first user-equipped UE, cause the first UE to: Transmit an instruction to a second UE that is in side-link communication with the first UE to switch from using the first side-link bandwidth portion SL-BWP to using the second SL-BWP; The second UE, utilizing the first SL-BWP, receives a Hybrid Automatic Repeat Request (HARQ) feedback associated with an indication to switch from utilizing the first SL-BWP to utilizing the second SL-BWP. Wherein, when the Physical Side Link Feedback Channel (PSFCH) is configured for a resource pool associated with the first SL-BWP, the first UE utilizing the first SL-BWP receives the HARQ feedback on the PSFCH via one or more resources associated with the second SL-BWP, or the one or more resources associated with the second SL-BWP are mapped to one or more resources associated with the first SL-BWP. When the PSFCH is not configured for the resource pool associated with the first SL-BWP, the HARQ feedback is received via the Sidelink Control Information Part 1SCI-1 on the Physical Sidelink Control Channel PSCCH, the Sidelink Control Information Part 2SCI-2 on the Physical Sidelink Shared Channel PSSCH, or the Media Access Control-Control Element MAC-CE on the PSSCH; and The switch from using the first SL-BWP to using the second SL-BWP is based at least in part on the HARQ feedback.

26. The non-transient computer-readable medium of claim 25, wherein the HARQ feedback includes an affirmative acknowledgment message.

27. The non-transient computer-readable medium of claim 25, wherein the first SL-BWP is an active SL-BWP being used by the first UE and the second UE for the sidelink communication.

28. A first device for wireless communication, comprising: A means for transmitting to a second device in side-link communication with the first device an instruction to switch from using a first side-link bandwidth portion SL-BWP to using a second SL-BWP; A means for receiving, from the second device utilizing the first SL-BWP, a Hybrid Automatic Repeat Request (HARQ) feedback associated with an indication to switch from utilizing the first SL-BWP to utilizing the second SL-BWP. Wherein, when the Physical Side Link Feedback Channel (PSFCH) is configured for a resource pool associated with the first SL-BWP, the first device utilizing the first SL-BWP receives the HARQ feedback from the second device utilizing the second SL-BWP via one or more resources associated with the second SL-BWP on the PSFCH, wherein the one or more resources associated with the second SL-BWP are mapped to one or more resources associated with the first SL-BWP, or When the PSFCH is not configured for the resource pool associated with the first SL-BWP, the HARQ feedback is received via the Sidelink Control Information Part 1SCI-1 on the Physical Sidelink Control Channel PSCCH, the Sidelink Control Information Part 2SCI-2 on the Physical Sidelink Shared Channel PSSCH, or the Media Access Control-Control Element MAC-CE on the PSSCH; and A means for switching from using the first SL-BWP to using the second SL-BWP, at least in part based on the HARQ feedback.

29. The first device of claim 28, wherein the HARQ feedback includes an affirmative acknowledgment message.

30. The first device of claim 28, wherein the first SL-BWP is an active SL-BWP being used by the first device and the second device for the sidelink communication.

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