Techniques for multi-hop sidelink relay configurations
By enabling UEs and network entities to communicate and authorize new intermediate relay UEs, the challenge of network unawareness in multi-hop sidelink relays is addressed, resulting in efficient sidelink channel configuration and improved communication efficiency.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- QUALCOMM INC
- Filing Date
- 2024-10-31
- Publication Date
- 2026-05-07
AI Technical Summary
In wireless communications systems, network entities are often unaware of new intermediate relay UEs added to multi-hop sidelink relays, leading to incomplete configuration of sidelink channels and inefficient relay connections.
UEs and network entities communicate to determine and authorize new intermediate relay UEs, exchanging identifiers, positions, and measurement results to establish and configure multi-hop sidelink relays, ensuring network awareness and efficient relay connections.
Enables effective inclusion of new intermediate relay UEs in multi-hop sidelink relays, enhancing network configuration and improving communication efficiency by ensuring proper sidelink channel setup and quality of service.
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Figure CN2024128728_07052026_PF_FP_ABST
Abstract
Description
TECHNIQUES FOR MULTI-HOP SIDELINK RELAY CONFIGURATIONS
[0001] FIELD OF TECHNOLOGY
[0002] The following relates to wireless communications, including techniques for multi-hop sidelink relay configurations.BACKGROUND
[0003] Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) . Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal FDMA (OFDMA) , or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) . A wireless multiple-access communications system may include one or more base stations, each supporting wireless communication for communication devices, which may be known as user equipment (UE) .
[0004] In some cases, one or more UEs may communicate via sidelink channels (e.g., directly with one another) . In some cases, the one or more UEs may serve to relay communications between a network entity and a remote UE (e.g., a UE to network (U2N) sidelink relay) .SUMMARY
[0005] The systems, methods, and devices of this disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein.
[0006] A method for wireless communications by a first user equipment (UE) is described. The method may include receiving, from a second UE, a first request to establish a relay connection between the first UE and the second UE, where the relay connection is associated with a multi-hop sidelink relay between a first network entity and a remote UE and transmitting, to the second UE, a first response message indicating an acceptance of the first request or a rejection of the first request based on a determination of whether to accept or reject the first request, where the determination is based on the first UE being connected with a second network entity that is different than the first network entity.
[0007] A first UE for wireless communications is described. The first UE may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively be operable to execute the code to cause the first UE to receive, from a second UE, a first request to establish a relay connection between the first UE and the second UE, where the relay connection is associated with a multi-hop sidelink relay between a first network entity and a remote UE and transmit, to the second UE, a first response message indicating an acceptance of the first request or a rejection of the first request based on a determination of whether to accept or reject the first request, where the determination is based on the first UE being connected with a second network entity that is different than the first network entity.
[0008] Another first UE for wireless communications is described. The first UE may include means for receiving, from a second UE, a first request to establish a relay connection between the first UE and the second UE, where the relay connection is associated with a multi-hop sidelink relay between a first network entity and a remote UE and means for transmitting, to the second UE, a first response message indicating an acceptance of the first request or a rejection of the first request based on a determination of whether to accept or reject the first request, where the determination is based on the first UE being connected with a second network entity that is different than the first network entity.
[0009] A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to receive, from a second UE, a first request to establish a relay connection between the first UE and the second UE, where the relay connection is associated with a multi-hop sidelink relay between a first network entity and a remote UE and transmit, to the second UE, a first response message indicating an acceptance of the first request or a rejection of the first request based on a determination of whether to accept or reject the first request, where the determination is based on the first UE being connected with a second network entity that is different than the first network entity.
[0010] Some examples of the method, first UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the second network entity, a second request to establish the relay connection between the first UE and the second UE, where transmission of the second request may be based on a determination to accept the first request.
[0011] In some examples of the method, first UEs, and non-transitory computer-readable medium described herein, the second request includes an identifier associated with the first network entity, a measurement of a sidelink channel within the multi-hop sidelink relay, an identifier associated with a donor UE of the multi-hop sidelink relay, an identifier associated with the remote UE, an identifier associated with the second UE, a purpose for establishing the relay connection between the first UE and the second UE, or any combination thereof.
[0012] Some examples of the method, first UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the second UE, a discovery message indicating the identifier associated with the second UE, where inclusion of the identifier associated with the second UE in the second request may be based on receipt of the discovery message and determining the identifier associated with the first network entity based on receipt of the discovery message, where inclusion of the identifier associated with the first network entity in the second request may be based on determination of the identifier.
[0013] In some examples of the method, first UEs, and non-transitory computer-readable medium described herein, the second request includes a radio resource control message and the radio resource control message may be a measurement report message or a UE assistance information message.
[0014] Some examples of the method, first UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the second network entity, a control signal that indicates for the first UE to report to the second network entity in response to receipt of a relay connection setup request, where transmission of the second request may be based on receipt of the control signal.
[0015] Some examples of the method, first UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to a third UE and based on a determination to accept the first request, a third request to establish a second relay connection between the first UE and the third UE, where the third UE may be included in the multi-hop sidelink relay between the first network entity and the remote UE and receiving, from the third UE and in response to the third request, a second response message that indicates an acceptance, by the third UE, to establish the second relay connection between the first UE and the third UE, where transmission of the second request may be based on receipt of the second response message.
[0016] In some examples of the method, first UEs, and non-transitory computer-readable medium described herein, the third request and the second response message include sidelink radio resource control signals.
[0017] In some examples of the method, first UEs, and non-transitory computer-readable medium described herein, transmitting the first response message may include operations, features, means, or instructions for indicating the rejection of the first request based on a determination to reject the first request, where the first response message includes a reason for the rejection of the first request.
[0018] In some examples of the method, first UEs, and non-transitory computer-readable medium described herein, the reason for the rejection of the first request includes the second network entity being different than the first network entity, the first UE being unable to switch sidelink relay connections based on a configuration received from the second network entity, a quality-of-service associated with ongoing traffic at the first UE, or any combination thereof.
[0019] In some examples of the method, first UEs, and non-transitory computer-readable medium described herein, and the method, apparatuses, and non-transitory computer-readable medium may include further operations, features, means, or instructions for the second UE includes a second intermediate relay UE of the multi-hop sidelink relay; or the second UE includes the remote UE.
[0020] A method for wireless communications by a first UE is described. The method may include transmitting, to a network entity, a request for configuration information for establishing a relay connection between the first UE and a second UE, where the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE, receiving, from the network entity, a control signal including the configuration information based on transmitting the request, and transmitting, to the second UE via the multi-hop sidelink relay, the configuration information to establish the relay connection between the first UE and the second UE, where the second UE is included in the multi-hop sidelink relay based on the configuration information.
[0021] A first UE for wireless communications is described. The first UE may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively be operable to execute the code to cause the first UE to transmit, to a network entity, a request for configuration information for establishing a relay connection between the first UE and a second UE, where the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE, receive, from the network entity, a control signal including the configuration information based on transmitting the request, and transmit, to the second UE via the multi-hop sidelink relay, the configuration information to establish the relay connection between the first UE and the second UE, where the second UE is included in the multi-hop sidelink relay based on the configuration information.
[0022] Another first UE for wireless communications is described. The first UE may include means for transmitting, to a network entity, a request for configuration information for establishing a relay connection between the first UE and a second UE, where the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE, means for receiving, from the network entity, a control signal including the configuration information based on transmitting the request, and means for transmitting, to the second UE via the multi-hop sidelink relay, the configuration information to establish the relay connection between the first UE and the second UE, where the second UE is included in the multi-hop sidelink relay based on the configuration information.
[0023] A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to transmit, to a network entity, a request for configuration information for establishing a relay connection between the first UE and a second UE, where the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE, receive, from the network entity, a control signal including the configuration information based on transmitting the request, and transmit, to the second UE via the multi-hop sidelink relay, the configuration information to establish the relay connection between the first UE and the second UE, where the second UE is included in the multi-hop sidelink relay based on the configuration information.
[0024] In some examples of the method, first UEs, and non-transitory computer-readable medium described herein, the request for the configuration information further includes first information associated with the second UE, second information associated with a sidelink channel between the second UE and an adjacent relay UE within the multi-hop sidelink relay, or both.
[0025] In some examples of the method, first UEs, and non-transitory computer-readable medium described herein, the first information includes an identifier associated with the second UE and a position of the second UE within the multi-hop sidelink relay; and the second information includes an identifier associated with the sidelink channel between the second UE and the adjacent relay UE, a measurement of the sidelink channel between the second UE and the adjacent relay UE, or both.
[0026] Some examples of the method, first UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the second UE via the multi-hop sidelink relay, a sidelink control message including the first information and the second information, where the request includes the first information and the second information based on receiving the sidelink control message.
[0027] In some examples of the method, first UEs, and non-transitory computer-readable medium described herein, the configuration information includes a configuration for a sidelink channel between the second UE and an adjacent UE within the multi-hop sidelink relay and a first indication to forward the configuration information to the second UE via the multi-hop sidelink relay.
[0028] In some examples of the method, first UEs, and non-transitory computer-readable medium described herein, the configuration information further includes a second indication to forward the configuration information to each relay UE that may be included in the multi-hop sidelink relay.
[0029] A method for wireless communications by a network entity is described. The method may include receiving, from a first UE, a request for configuration information for establishing a relay connection between the first UE and a second UE, where the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE, performing an authorization procedure to determine whether to accept or reject the request, and transmitting the configuration information to establish the relay connection between the first UE and the second UE based on an acceptance of the request, where the second UE is included in the multi-hop sidelink relay between the network entity and the remote UE based on the configuration information.
[0030] A network entity for wireless communications is described. The network entity may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively be operable to execute the code to cause the network entity to receive, from a first UE, a request for configuration information for establishing a relay connection between the first UE and a second UE, where the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE, perform an authorization procedure to determine whether to accept or reject the request, and transmit the configuration information to establish the relay connection between the first UE and the second UE based on an acceptance of the request, where the second UE is included in the multi-hop sidelink relay between the network entity and the remote UE based on the configuration information.
[0031] Another network entity for wireless communications is described. The network entity may include means for receiving, from a first UE, a request for configuration information for establishing a relay connection between the first UE and a second UE, where the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE, means for performing an authorization procedure to determine whether to accept or reject the request, and means for transmitting the configuration information to establish the relay connection between the first UE and the second UE based on an acceptance of the request, where the second UE is included in the multi-hop sidelink relay between the network entity and the remote UE based on the configuration information.
[0032] A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to receive, from a first UE, a request for configuration information for establishing a relay connection between the first UE and a second UE, where the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE, perform an authorization procedure to determine whether to accept or reject the request, and transmit the configuration information to establish the relay connection between the first UE and the second UE based on an acceptance of the request, where the second UE is included in the multi-hop sidelink relay between the network entity and the remote UE based on the configuration information.
[0033] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the configuration information includes a configuration for a sidelink channel between the second UE and an adjacent UE within the multi-hop sidelink relay and an indication to forward the configuration information to the second UE via the multi-hop sidelink relay.
[0034] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the configuration information further includes a second indication to forward the configuration information to each relay UE that may be included in the multi-hop sidelink relay.
[0035] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the request for the configuration information includes an identifier associated with the second UE, a position of the second UE within the multi-hop sidelink relay, an identifier associated with a sidelink channel between the second UE and an adjacent relay UE within the multi-hop sidelink relay, a measurement of the sidelink channel between the second UE and the adjacent relay UE, or any combination thereof.
[0036] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, performing the authorization procedure may include operations, features, means, or instructions for transmitting, to a core network associated with the network entity, a message indicating the identifier associated with the second UE and indicating that the second UE may be an intermediate relay UE within the multi-hop sidelink relay and receiving, from the core network, a second message indicating whether the second UE may be authorized as an intermediate relay UE for the multi-hop sidelink relay, where transmitting the configuration information may be based on the second message indicating that the second UE may be authorized.
[0037] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the first UE may be a donor relay UE of the multi-hop sidelink relay; or the first UE may be the remote UE.
[0038] Details of one or more implementations of the subject matter described in this disclosure are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages will become apparent from the description, the drawings, and the claims. Note that the relative dimensions of the following figures may not be drawn to scale.BRIEF DESCRIPTION OF THE DRAWINGS
[0039] FIG. 1 shows an example of a wireless communications system that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure.
[0040] FIG. 2 shows an example of a wireless communications system that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure.
[0041] FIG. 3 shows an example of a process flow that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure.
[0042] FIG. 4 shows an example of a process flow that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure.
[0043] FIGs. 5 and 6 show block diagrams of devices that support techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure.
[0044] FIG. 7 shows a block diagram of a communications manager that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure.
[0045] FIG. 8 shows a diagram of a system including a device that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure.
[0046] FIGs. 9 and 10 show block diagrams of devices that support techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure.
[0047] FIG. 11 shows a block diagram of a communications manager that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure.
[0048] FIG. 12 shows a diagram of a system including a device that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure.
[0049] FIGs. 13 through 15 show flowcharts illustrating methods that support techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure.DETAILED DESCRIPTION
[0050] In some wireless communications systems, one or more user equipments (UEs) may communicate via a sidelink connection (e.g., a wireless connection between two UEs) . In some examples, the UEs may serve to relay communications between a network entity (e.g., a serving cell) and a UE that is out of coverage (but still connected to and communicating signaling with the network entity) . Such a relay may be referred to as a sidelink relay (e.g., a UE to network (U2N) relay) , and may be referred to as a multi-hop sidelink relay when multiple UEs are used to relay the communications between the network entity and the remote UE. In some examples, a multi-hop sidelink relay may be established between the network entity and the remote UE that includes multiple intermediate relay UEs (e.g., UEs that relay communications between the network entity and the remote UE) . In some cases, after establishing the multi-hop sidelink relay, one or more UEs of the multi-hop sidelink relay may determine to include a new intermediate relay UE in the multi-hop sidelink relay to support relaying communications between the network entity and the remote UE. However, in such examples, the network entity may be unaware of the new intermediate relay UE (e.g., information about the new intermediate relay UE may not be visible to the network entity) , which may result in the network entity being unable to provide configuration information for adding the intermediate relay UE to the multi-hop sidelink relay and configuring sidelink channels between the intermediate relay UE and previously-established intermediate relay UEs.
[0051] To include a new intermediate relay UE in a previously-established multi-hop sidelink relay, one or more UEs included in the multi-hop sidelink relay may communicate signaling to determine whether to add the new intermediate relay UE and to inform the network entity of the new intermediate relay UE.
[0052] In a first example, the remote UE or a donor UE (e.g., a UE having a direct connection with the network entity) may report information associated with the intermediate relay UE and a corresponding sidelink connection (e.g., a PC5 link) to the network entity. For example, the remote or donor UE may transmit a sidelink control signal indicating an identifier (ID) of the intermediate relay UE and a position of the intermediate relay UE in the multi-hop sidelink relay (e.g., an nth relay UE relative to the remote or donor UE) . The sidelink control signal may further indicate measurement results for a PC5 link associated with the intermediate relay UE (e.g., an nth PC5 link relative to the remote or donor UE) . The network entity may receive the sidelink control signal, may authorize the intermediate relay UE (e.g., with a core network) , and may transmit configuration information for establishing the new intermediate relay UE in the multi-hop sidelink connection.
[0053] In a second example, the intermediate relay UE may be connected with a second network entity (e.g., a different serving cell) , and may determine whether to accept or reject a request to establish a sidelink connection in the multi-hop sidelink relay according to the connection with the second network entity. For example, the intermediate relay UE may reject the request due to having the connection with the second network entity, a configuration of the connection with the second network entity, or quality of service (QoS) constraints associated with ongoing traffic at the UE. Alternatively, the intermediate relay UE may accept the request, and may transmit a control signal to the second network entity indicating information associated with the multi-hop sidelink relay (e.g., the ID of the target cell, IDs of UEs included in the multi-hop sidelink relay, a purpose for switching connections) .
[0054] Aspects of the disclosure are initially described in the context of wireless communications systems. Aspects of the disclosure are further described with reference to process flows. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to techniques for multi-hop sidelink relay configurations.
[0055] FIG. 1 shows an example of a wireless communications system 100 that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure. The wireless communications system 100 may include one or more devices, such as one or more network devices (e.g., network entities 105) , one or more UEs 115, and a core network 130. In some examples, the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, a New Radio (NR) network, or a network operating in accordance with other systems and radio technologies, including future systems and radio technologies not explicitly mentioned herein.
[0056] The network entities 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may include devices in different forms or having different capabilities. In various examples, a network entity 105 may be referred to as a network element, a mobility element, a radio access network (RAN) node, or network equipment, among other nomenclature. In some examples, network entities 105 and UEs 115 may wirelessly communicate via communication link (s) 125 (e.g., a radio frequency (RF) access link) . For example, a network entity 105 may support a coverage area 110 (e.g., a geographic coverage area) over which the UEs 115 and the network entity 105 may establish the communication link (s) 125. The coverage area 110 may be an example of a geographic area over which a network entity 105 and a UE 115 may support the communication of signals according to one or more radio access technologies (RATs) .
[0057] The UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of supporting communications with various types of devices in the wireless communications system 100 (e.g., other wireless communication devices, including UEs 115 or network entities 105) , as shown in FIG. 1.
[0058] As described herein, a node of the wireless communications system 100, which may be referred to as a network node, or a wireless node, may be a network entity 105 (e.g., any network entity described herein) , a UE 115 (e.g., any UE described herein) , a network controller, an apparatus, a device, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, a node may be a UE 115. As another example, a node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In yet other aspects of this example, the first, second, and third nodes may be different relative to these examples. Similarly, reference to a UE 115, network entity 105, apparatus, device, computing system, or the like may include disclosure of the UE 115, network entity 105, apparatus, device, computing system, or the like being a node. For example, disclosure that a UE 115 is configured to receive information from a network entity 105 also discloses that a first node is configured to receive information from a second node.
[0059] In some examples, network entities 105 may communicate with a core network 130, or with one another, or both. For example, network entities 105 may communicate with the core network 130 via backhaul communication link (s) 120 (e.g., in accordance with an S1, N2, N3, or other interface protocol) . In some examples, network entities 105 may communicate with one another via backhaul communication link (s) 120 (e.g., in accordance with an X2, Xn, or other interface protocol) either directly (e.g., directly between network entities 105) or indirectly (e.g., via the core network 130) . In some examples, network entities 105 may communicate with one another via a midhaul communication link 162 (e.g., in accordance with a midhaul interface protocol) or a fronthaul communication link 168 (e.g., in accordance with a fronthaul interface protocol) , or any combination thereof. The backhaul communication link (s) 120, midhaul communication links 162, or fronthaul communication links 168 may be or include one or more wired links (e.g., an electrical link, an optical fiber link) or one or more wireless links (e.g., a radio link, a wireless optical link) , among other examples or various combinations thereof. A UE 115 may communicate with the core network 130 via a communication link 155.
[0060] One or more of the network entities 105 or network equipment described herein may include or may be referred to as a base station 140 (e.g., a base transceiver station, a radio base station, an NR base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or giga-NodeB (either of which may be referred to as a gNB) , a 5G NB, a next-generation eNB (ng-eNB) , a Home NodeB, a Home eNodeB, or other suitable terminology) . In some examples, a network entity 105 (e.g., a base station 140) may be implemented in an aggregated (e.g., monolithic, standalone) base station architecture, which may be configured to utilize a protocol stack that is physically or logically integrated within one network entity (e.g., a network entity 105 or a single RAN node, such as a base station 140) .
[0061] In some examples, a network entity 105 may be implemented in a disaggregated architecture (e.g., a disaggregated base station architecture, a disaggregated RAN architecture) , which may be configured to utilize a protocol stack that is physically or logically distributed among multiple network entities (e.g., network entities 105) , such as an integrated access and backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance) , or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN) ) . For example, a network entity 105 may include one or more of a central unit (CU) , such as a CU 160, a distributed unit (DU) , such as a DU 165, a radio unit (RU) , such as an RU 170, a RAN Intelligent Controller (RIC) , such as an RIC 175 (e.g., a Near-Real Time RIC (Near-RT RIC) , a Non-Real Time RIC (Non-RT RIC) ) , a Service Management and Orchestration (SMO) system, such as an SMO system 180, or any combination thereof. An RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH) , a remote radio unit (RRU) , or a transmission reception point (TRP) . One or more components of the network entities 105 in a disaggregated RAN architecture may be co-located, or one or more components of the network entities 105 may be located in distributed locations (e.g., separate physical locations) . In some examples, one or more of the network entities 105 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU) , a virtual DU (VDU) , a virtual RU (VRU) ) .
[0062] The split of functionality between a CU 160, a DU 165, and an RU 170 is flexible and may support different functionalities depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, or any combinations thereof) are performed at a CU 160, a DU 165, or an RU 170. For example, a functional split of a protocol stack may be employed between a CU 160 and a DU 165 such that the CU 160 may support one or more layers of the protocol stack and the DU 165 may support one or more different layers of the protocol stack. In some examples, the CU 160 may host upper protocol layer (e.g., layer 3 (L3) , layer 2 (L2) ) functionality and signaling (e.g., Radio Resource Control (RRC) , service data adaptation protocol (SDAP) , Packet Data Convergence Protocol (PDCP) ) . The CU 160 (e.g., one or more CUs) may be connected to a DU 165 (e.g., one or more DUs) or an RU 170 (e.g., one or more RUs) , or some combination thereof, and the DUs 165, RUs 170, or both may host lower protocol layers, such as layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160. Additionally, or alternatively, a functional split of the protocol stack may be employed between a DU 165 and an RU 170 such that the DU 165 may support one or more layers of the protocol stack and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or multiple different cells (e.g., via one or multiple different RUs, such as an RU 170) . In some cases, a functional split between a CU 160 and a DU 165 or between a DU 165 and an RU 170 may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU 160, a DU 165, or an RU 170, while other functions of the protocol layer are performed by a different one of the CU 160, the DU 165, or the RU 170) . A CU 160 may be functionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions. A CU 160 may be connected to a DU 165 via a midhaul communication link 162 (e.g., F1, F1-c, F1-u) , and a DU 165 may be connected to an RU 170 via a fronthaul communication link 168 (e.g., open fronthaul (FH) interface) . In some examples, a midhaul communication link 162 or a fronthaul communication link 168 may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities (e.g., one or more of the network entities 105) that are in communication via such communication links.
[0063] In some wireless communications systems (e.g., the wireless communications system 100) , infrastructure and spectral resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, providing an IAB network architecture (e.g., to a core network 130) . In some cases, in an IAB network, one or more of the network entities 105 (e.g., network entities 105 or IAB node (s) 104) may be partially controlled by each other. The IAB node (s) 104 may be referred to as a donor entity or an IAB donor. A DU 165 or an RU 170 may be partially controlled by a CU 160 associated with a network entity 105 or base station 140 (such as a donor network entity or a donor base station) . The one or more donor entities (e.g., IAB donors) may be in communication with one or more additional devices (e.g., IAB node (s) 104) via supported access and backhaul links (e.g., backhaul communication link (s) 120) . IAB node (s) 104 may include an IAB mobile termination (IAB-MT) controlled (e.g., scheduled) by one or more DUs (e.g., DUs 165) of a coupled IAB donor. An IAB-MT may be equipped with an independent set of antennas for relay of communications with UEs 115 or may share the same antennas (e.g., of an RU 170) of IAB node (s) 104 used for access via the DU 165 of the IAB node (s) 104 (e.g., referred to as virtual IAB-MT (vIAB-MT) ) . In some examples, the IAB node (s) 104 may include one or more DUs (e.g., DUs 165) that support communication links with additional entities (e.g., IAB node (s) 104, UEs 115) within the relay chain or configuration of the access network (e.g., downstream) . In such cases, one or more components of the disaggregated RAN architecture (e.g., the IAB node (s) 104 or components of the IAB node (s) 104) may be configured to operate according to the techniques described herein.
[0064] In the case of the techniques described herein applied in the context of a disaggregated RAN architecture, one or more components of the disaggregated RAN architecture may be configured to support techniques for multi-hop sidelink relay configurations as described herein. For example, some operations described as being performed by a UE 115 or a network entity 105 (e.g., a base station 140) may additionally, or alternatively, be performed by one or more components of the disaggregated RAN architecture (e.g., components such as an IAB node, a DU 165, a CU 160, an RU 170, an RIC 175, an SMO system 180) .
[0065] A UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples. A UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA) , a tablet computer, a laptop computer, or a personal computer. In some examples, a UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, vehicles, or meters, among other examples.
[0066] The UEs 115 described herein may be able to communicate with various types of devices, such as UEs 115 that may sometimes operate as relays, as well as the network entities 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.
[0067] The UEs 115 and the network entities 105 may wirelessly communicate with one another via the communication link (s) 125 (e.g., one or more access links) using resources associated with one or more carriers. The term “carrier” may refer to a set of RF spectrum resources having a defined PHY layer structure for supporting the communication link (s) 125. For example, a carrier used for the communication link (s) 125 may include a portion of an RF spectrum band (e.g., a bandwidth part (BWP) ) that is operated according to one or more PHY layer channels for a given RAT (e.g., LTE, LTE-A, LTE-A Pro, NR) . Each PHY layer channel may carry acquisition signaling (e.g., synchronization signals, system information) , control signaling that coordinates operation for the carrier, user data, or other signaling. The wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation. A UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers. Communication between a network entity 105 and other devices may refer to communication between the devices and any portion (e.g., entity, sub-entity) of a network entity 105. For example, the terms “transmitting, ” “receiving, ” or “communicating, ” when referring to a network entity 105, may refer to any portion of a network entity 105 (e.g., a base station 140, a CU 160, a DU 165, a RU 170) of a RAN communicating with another device (e.g., directly or via one or more other network entities, such as one or more of the network entities 105) .
[0068] The communication link (s) 125 of the wireless communications system 100 may include downlink transmissions (e.g., forward link transmissions) from a network entity 105 to a UE 115, uplink transmissions (e.g., return link transmissions) from a UE 115 to a network entity 105, or both, among other configurations of transmissions. Carriers may carry downlink or uplink communications (e.g., in an FDD mode) or may be configured to carry downlink and uplink communications (e.g., in a TDD mode) .
[0069] Signal waveforms transmitted via a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) . In a system employing MCM techniques, a resource element may refer to resources of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, in which case the symbol period and subcarrier spacing may be inversely related. The quantity of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both) , such that a relatively higher quantity of resource elements (e.g., in a transmission duration) and a relatively higher order of a modulation scheme may correspond to a relatively higher rate of communication. A wireless communications resource may refer to a combination of an RF spectrum resource, a time resource, and a spatial resource (e.g., a spatial layer, a beam) , and the use of multiple spatial resources may increase the data rate or data integrity for communications with a UE 115.
[0070] The time intervals for the network entities 105 or the UEs 115 may be expressed in multiples of a basic time unit which may, for example, refer to a sampling period of Ts=1 / (Δfmax·Nf) seconds, for which Δfmax may represent a supported subcarrier spacing, and Nf may represent a supported discrete Fourier transform (DFT) size. Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms) ) . Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023) .
[0071] Each frame may include multiple consecutively-numbered subframes or slots, and each subframe or slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a quantity of slots. Alternatively, each frame may include a variable quantity of slots, and the quantity of slots may depend on subcarrier spacing. Each slot may include a quantity of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) . In some wireless communications systems, such as the wireless communications system 100, a slot may further be divided into multiple mini-slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., Nf) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.
[0072] A subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI) . In some examples, the TTI duration (e.g., a quantity of symbol periods in a TTI) may be variable. Additionally, or alternatively, the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) ) .
[0073] Physical channels may be multiplexed for communication using a carrier according to various techniques. A physical control channel and a physical data channel may be multiplexed for signaling via a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET) ) for a physical control channel may be defined by a set of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) may be configured for a set of the UEs 115. For example, one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to an amount of control channel resources (e.g., control channel elements (CCEs) ) associated with encoded information for a control information format having a given payload size. Search space sets may include common search space sets configured for sending control information to UEs 115 (e.g., one or more UEs) or may include UE-specific search space sets for sending control information to a UE 115 (e.g., a specific UE) .
[0074] A network entity 105 may provide communication coverage via one or more cells, for example a macro cell, a small cell, a hot spot, or other types of cells, or any combination thereof. The term “cell” may refer to a logical communication entity used for communication with a network entity 105 (e.g., using a carrier) and may be associated with an identifier for distinguishing neighboring cells (e.g., a physical cell identifier (PCID) , a virtual cell identifier (VCID) ) . In some examples, a cell also may refer to a coverage area 110 or a portion of a coverage area 110 (e.g., a sector) over which the logical communication entity operates. Such cells may range from smaller areas (e.g., a structure, a subset of structure) to larger areas depending on various factors such as the capabilities of the network entity 105. For example, a cell may be or include a building, a subset of a building, or exterior spaces between or overlapping with coverage areas 110, among other examples.
[0075] A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by the UEs 115 with service subscriptions with the network provider supporting the macro cell. A small cell may be associated with a network entity 105 operating with lower power (e.g., a base station 140 operating with lower power) relative to a macro cell, and a small cell may operate using the same or different (e.g., licensed, unlicensed) frequency bands as macro cells. Small cells may provide unrestricted access to the UEs 115 with service subscriptions with the network provider or may provide restricted access to the UEs 115 having an association with the small cell (e.g., the UEs 115 in a closed subscriber group (CSG) , the UEs 115 associated with users in a home or office) . A network entity 105 may support one or more cells and may also support communications via the one or more cells using one or multiple component carriers.
[0076] In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT) , enhanced mobile broadband (eMBB) ) that may provide access for different types of devices.
[0077] In some examples, a network entity 105 (e.g., a base station 140, an RU 170) may be movable and therefore provide communication coverage for a moving coverage area, such as the coverage area 110. In some examples, coverage areas 110 (e.g., different coverage areas) associated with different technologies may overlap, but the coverage areas 110 (e.g., different coverage areas) may be supported by the same network entity (e.g., a network entity 105) . In some other examples, overlapping coverage areas, such as a coverage area 110, associated with different technologies may be supported by different network entities (e.g., the network entities 105) . The wireless communications system 100 may include, for example, a heterogeneous network in which different types of the network entities 105 support communications for coverage areas 110 (e.g., different coverage areas) using the same or different RATs.
[0078] The wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof. For example, the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC) . The UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions. Ultra-reliable communications may include private communication or group communication and may be supported by one or more services such as push-to-talk, video, or data. Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency may be used interchangeably herein.
[0079] In some examples, a UE 115 may be configured to support communicating directly with other UEs (e.g., one or more of the UEs 115) via a device-to-device (D2D) communication link, such as a D2D communication link 135 (e.g., in accordance with a peer-to-peer (P2P) , D2D, or sidelink protocol) . In some examples, one or more UEs 115 of a group that are performing D2D communications may be within the coverage area 110 of a network entity 105 (e.g., a base station 140, an RU 170) , which may support aspects of such D2D communications being configured by (e.g., scheduled by) the network entity 105. In some examples, one or more UEs 115 of such a group may be outside the coverage area 110 of a network entity 105 or may be otherwise unable to or not configured to receive transmissions from a network entity 105. In some examples, groups of the UEs 115 communicating via D2D communications may support a one-to-many (1: M) system in which each UE 115 transmits to one or more of the UEs 115 in the group. In some examples, a network entity 105 may facilitate the scheduling of resources for D2D communications. In some other examples, D2D communications may be carried out between the UEs 115 without an involvement of a network entity 105.
[0080] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or 5G core (5GC) , which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management function (AMF) ) and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the network entities 105 (e.g., base stations 140) associated with the core network 130. User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions. The user plane entity may be connected to IP services 150 for one or more network operators. The IP services 150 may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched Streaming Service.
[0081] The wireless communications system 100 may operate using one or more frequency bands, which may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) . Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, which may be referred to as clusters, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors. Communications using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than one hundred kilometers) compared to communications using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.
[0082] The wireless communications system 100 may utilize both licensed and unlicensed RF spectrum bands. For example, the wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) RAT, or NR technology using an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. While operating using unlicensed RF spectrum bands, devices such as the network entities 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance. In some examples, operations using unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating using a licensed band (e.g., LAA) . Operations using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.
[0083] A network entity 105 (e.g., a base station 140, an RU 170) or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of a network entity 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, antennas or antenna arrays associated with a network entity 105 may be located at diverse geographic locations. A network entity 105 may include an antenna array with a set of rows and columns of antenna ports that the network entity 105 may use to support beamforming of communications with a UE 115. Likewise, a UE 115 may include one or more antenna arrays that may support various MIMO or beamforming operations. Additionally, or alternatively, an antenna panel may support RF beamforming for a signal transmitted via an antenna port.
[0084] Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a network entity 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating along particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference. The adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .
[0085] The wireless communications system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, communications at the bearer or PDCP layer may be IP-based. An RLC layer may perform packet segmentation and reassembly to communicate via logical channels. A MAC layer may perform priority handling and multiplexing of logical channels into transport channels. The MAC layer also may implement error detection techniques, error correction techniques, or both to support retransmissions to improve link efficiency. In the control plane, an RRC layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and a network entity 105 or a core network 130 supporting radio bearers for user plane data. A PHY layer may map transport channels to physical channels.
[0086] In some wireless communications systems (e.g., the wireless communications system 100) , one or more UEs 115 may communicate via a sidelink connection (e.g., a wireless connection between two UEs 115) . In some examples, the UEs 115 may serve to relay communications between a network entity 105 (e.g., a serving cell) and a UE 115 that is out of coverage of (but still connected to and communicating signaling with) the network entity 105. Such a relay may be referred to as a sidelink relay (e.g., a UE to network (U2N) relay) , and may be referred to as a multi-hop sidelink relay when multiple UEs 115 are used to relay the communications between the network entity 105 and the remote UE 115. In some examples, a multi-hop sidelink relay may be established between the network entity 105 and the remote UE 115 that includes multiple intermediate relay UEs 115 (e.g., UEs 115 that relay communications between the network entity 105 and the remote UE 115) . In some cases, after establishing the multi-hop sidelink relay, one or more UEs 115 of the multi-hop sidelink relay may determine to include a new intermediate relay UE 115 in the multi-hop sidelink relay to support relaying communications between the network entity 105 and the remote UE 115. However, in such examples, the network entity 105 may be unaware of the new intermediate relay UE 115 (e.g., information about the new intermediate relay UE 115 may not be visible to the network entity 105) , which may result in the network entity 105 being unable to provide configuration information for adding the intermediate relay UE 115 to the multi-hop sidelink relay and configuring sidelink channels between the intermediate relay UE 115 and previously-established intermediate relay UEs 115.
[0087] To include a new intermediate relay UE 115 in a previously-established multi-hop sidelink relay, one or more UEs 115 included in the multi-hop sidelink relay may communicate signaling to determine whether to add the new intermediate relay UE 115 and to inform the network entity 105 of the new intermediate relay UE 115. In a first example, the remote UE 115 or a donor UE 115 (e.g., a UE 115 having a direct connection with the network entity 105) may report information associated with the intermediate relay UE 115 and a corresponding sidelink connection (e.g., a PC5 link) to the network entity 105. For example, the remote or donor UE 115 may transmit a sidelink control signal indicating an identifier (ID) of the intermediate relay UE 115 and a position of the intermediate relay UE 115 in the multi-hop sidelink relay (e.g., an nth relay UE 115 relative to the remote or donor UE 115) . The sidelink control signal may further indicate measurement results for a PC5 link associated with the intermediate relay UE 115 (e.g., an nth PC5 link relative to the remote or donor UE 115) . The network entity 105 may receive the sidelink control signal, may authorize the intermediate relay UE 115 (e.g., with a core network) , and may transmit configuration information for establishing the new intermediate relay UE 115 in the multi-hop sidelink connection. In a second example, the intermediate relay UE 115 may be connected with a second network entity 105 (e.g., a different serving cell) , and may determine whether to accept or reject a request to establish a sidelink connection in the multi-hop sidelink relay according to the connection with the second network entity 105. For example, the intermediate relay UE 115 may reject the request due to having the connection with the second network entity 105, a configuration of the connection with the second network entity 105, or quality of service (QoS) constraints associated with ongoing traffic at the UE 115. Alternatively, the intermediate relay UE 115 may accept the request, and may transmit a control signal to the second network entity 105 indicating information associated with the multi-hop sidelink relay (e.g., the ID of the target cell, IDs of UEs included in the multi-hop sidelink relay, a purpose for switching connections) .
[0088] FIG. 2 shows an example of a wireless communications system 200 that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure. The wireless communications system 200 may implement, or be implemented by, one or more aspects of the wireless communications system 100. For example, the wireless communications system 200 illustrates operations and signaling between one or more UEs 115 and one or more network entities 105, which may be examples of corresponding devices described with reference to FIG. 1. The wireless communications system 200 may support a multi-hop sidelink relay for relaying communications between a network entity 105-a and a remote UE 115-a. For example, the wireless communications system 200 may include a donor UE 115-b, an intermediate relay UE 115-d, and an intermediate relay UE 115-e. In some examples, the wireless communications system 200 may support establishing a relay connection between an intermediate relay UE 115-c and one or more other UEs 115 of the multi-hop sidelink relay to include (e.g., add) the intermediate relay UE 115-c to the multi-hop sidelink relay.
[0089] The network entity 105-a may utilize a multi-hop sidelink relay to communicate with a remote UE 115-a. For example, the network entity 105-a may transmit signaling intended for the UE 115-a to the UE 115-b (e.g., a donor UE) via a Uu connection 205 (e.g., a connection supporting uplink and downlink signaling between the UE 115-b and the network entity 105-a) . The UE 115-b may relay the signaling to the UE 115-d (e.g., a first intermediate relay UE) via a sidelink connection 210-a, the UE 115-d may relay the signaling to the UE 115-e (e.g., a second intermediate relay UE) via a sidelink connection 210-b, and the UE 115-e may relay the signaling to the UE 115-a via a sidelink connection 210-c. As described herein, the sidelink connections 210 may be examples of PC5 links supporting communications between UEs 115. It should be noted that while the wireless communications system 200 illustrates a multi-hop sidelink relay including a remote UE, a donor UE, and two intermediate relay UEs, the techniques described herein may be applicable to a multi-hop sidelink relay including any quantity of intermediate relay UEs having any configuration of sidelink connections 210 for relaying communications between the network entity 105-a and the remote UE 115-a.
[0090] In some examples, the UEs 115 of the multi-hop sidelink relay may determine to include a new intermediate relay UE 115-c to the multi-hop sidelink relay. For example, changes in the physical locations of the UEs 115 or changes in the connection status of the UEs 115 (among other examples) may result in the multi-hop sidelink relay being improved by including the UE 115-c as an intermediate relay UE after the multi-hop sidelink relay has been established. In some cases, adding the UE 115-c may support the UE 115-c replacing an existing intermediate relay UE, such as the UE 115-e, improving flexibility of the multi-hop sidelink relay, such as by enabling the remote UE 115-a to choose an intermediate relay UE for forwarding communications (e.g., according to connection status, traffic constraints, or the like) , improving robustness of the multi-hop sidelink relay, such as by including the UE 115-c as an additional point of connection between the UE 115-a and the UE 115-e, or any combination thereof.
[0091] However, the network entity 105-a may not be connected with the UE 115-c (e.g., the UE 115-c may have no RRC connection with the network entity 105-a that serves the remote UE 115-a) , and information associated with the UE 115-c may not be visible to the network entity 105-a. In such examples, the network entity 105-a may be unable to control and provide an RLC channel configuration to the UE 115-c to establish the UE 115-c as an intermediate relay UE of the multi-hop sidelink relay.
[0092] To support including the UE 115-c as an intermediate relay UE of the multi-hop sidelink relay, one or more UEs 115 of the multi-hop sidelink relay may communicate signaling to inform the network entity 105-a of the information associated with the UE 115-c. In some examples, one of the remote UE 115-a or the donor UE 115-b (which may be referred to as a first UE) may report the intermediate relay UE 115-c (which may be referred to as a second UE) to the network entity 105-a and may report information associated with a corresponding sidelink connection 210 (e.g., a corresponding PC5 link) . For example, the remote UE 115-a or the donor UE 115-b may transmit a message (e.g., via the multi-hop sidelink relay) to the network entity 105-a including a request for configuration information for establishing a relay connection between the remote UE 115-a or the donor UE 115-b and the new intermediate relay UE 115-c. The request for configuration information may include first information associated with the UE 115-c, second information associated with a sidelink connection 210 (e.g., a sidelink channel) between the UE 115-c and an adjacent relay UE within the multi-hop sidelink relay, or both.
[0093] As an example, the request for configuration information may indicate an ID of the UE 115-c and a role (e.g., position) of the UE 115-c within the multi-hop sidelink relay. The request may indicate the ID of the UE 115-c as a layer-2 UE ID, a sidelink temporary mobile subscriber identity (S-TMSI) , a subscriber permanent identifier (SUPI) , an IP address, or any combination thereof. The role of the UE 115-c may be indicated as a position of the UE 115-c relative to the UE 115 reporting the request (e.g., an nth relay UE 115 close to the reporting UE 115) . In the example illustrated by the wireless communications system 200, if the remote UE 115-a transmits the request for configuration information, the remote UE 115-a may indicate that the UE 115-c is a 1st intermediate relay UE from the UE 115-a, and if the donor UE 115-b transmits the request for configuration information, the donor UE 115-b may indicate that the UE 115-c is a 3rd intermediate relay UE from the UE 115-b.
[0094] The request may further include information associated with an nth sidelink connection 210 between the UE 115-c and an adjacent intermediate relay UE of the multi-hop sidelink relay. For example, if the remote UE 115-a transmits the request for configuration information, the remote UE 115-a may indicate an ID of a sidelink connection 210-d between the remote UE 115-a and the UE 115-c (e.g., a 1st PC5 link ID from the remote UE 115-a, which may be omitted when the request includes the ID and position of the UE 115-c) and a measurement of the sidelink connection 210-d. In some such examples, the sidelink connection 210-c may be reused between the UE 115-c and the UE 115-e (e.g., only the sidelink connection 210-d may require configuration information to establish the sidelink relay between the UE 115-a and the UE 115-c) . Additionally, or alternatively, if the donor UE 115-b transmits the request for configuration information, the donor UE 115-b may indicate an ID of a sidelink connection 210-e between the intermediate relay UE 115-d and the UE 115-c (e.g., a 3rd PC5 link from the donor UE 115-b, which may be omitted when the request includes the ID and position of the UE 115-c) . In some such examples, the sidelink connection 210-c may be reused between the UE 115-c and the UE 115-a (e.g., only the sidelink connection 210-e may require configuration information to establish the sidelink relay between the UE 115-a and the UE 115-c) . The measurement result of the sidelink connection 210 indicated in the request may be a sidelink reference signal received power (SL-RSRP) , a sidelink reference signal received quality (SL-RSRQ) , a sidelink discovery RSRP (SD-RSRP) , or any combination thereof.
[0095] In some cases, the remote UE 115-a or the donor UE 115-b may receive the first information associated with the UE 115-c, the second information associated with the sidelink connection 210-d and / or the sidelink connection 210-e, or both via a sidelink control message (e.g., a PC5 RRC message) . For example, the UE 115-c may transmit the sidelink control message to the remote UE 115-a indicating the information of the UE 115-c and the information of the sidelink connection 210-d, and the remote UE 115-a may transmit the request for configuration information (e.g., including the UE 115-c information and / or the measurement of the sidelink connection 210-d) to the network entity 105-a via a Uu connection 215 between the network entity 105-a and the remote UE 115-a (e.g., included in an RRC message to the network entity 105-a, such as a SidelinkUEInformation message) . Additionally, or alternatively, the UE 115-c may transmit the sidelink control message to the intermediate relay UE 115-d, and the intermediate relay UE 115-d may forward the UE 115-c information and the sidelink connection 210-e information to the donor UE 115-b. In some cases, the intermediate relay UE 115-d may further include information of the UE 115-d (e.g., an ID and position of the UE 115-d) and information of the sidelink connection 210-a in the sidelink control message to the donor UE 115-b. The donor UE 115-b may transmit the request for configuration information (e.g., including the UE 115-c information, the measurement of the sidelink connection 210-e, the UE 115-d information, the measurement of the sidelink connection 210-a, or any combination thereof) to the network entity 105-a via the Uu connection 205 (e.g., included in an RRC message to the network entity 105-a, such as a SidelinkUEInformation message) .
[0096] In some cases, after receiving the request for configuration information, the network entity 105-a may communicate with a core network 220 to perform an authorization procedure to determine whether to accept or reject the request to include the UE 115-c as an intermediate relay UE in the multi-hop sidelink relay. For example, the network entity 105-a may transmit, to the core network 220, a message indicating the ID of the UE 115-c and indicating that the UE 115-c is to be an intermediate relay UE within the multi-hop sidelink relay. The core network 220 may receive the message and may verify the authorization information for the UE 115-c (e.g., determine whether the UE 115-c is capable of serving as an intermediate relay UE in the multi-hop sidelink relay) . The core network 220 may transmit a second message to the network entity 105-a indicating authorization results for the UE 115-c and the network entity 105-a may determine, based on the authorization results, whether to admit the UE 115-c as an intermediate relay UE in the multi-hop sidelink relay. For example, the authorization results may indicate that the UE 115-c is authorized to be an intermediate relay UE in the multi-hop sidelink relay, and the network entity 105-a may determine to admit the UE 115-c to the multi-hop sidelink relay.
[0097] In some examples, the network entity 105-a may receive the request for configuration information including the information of the intermediate relay UE 115-c and the PC5 link information (e.g., a measurement of the sidelink connection 210-d, the sidelink connection 210-e, or both) and may indicate the configuration information to the intermediate relay UE 115-c in response to the request (e.g., if the UE 115-c has been authorized by the core network 220) . For example, the network entity 105-a may transmit the configuration information to the UE 115 that sent the request (e.g., the remote UE 115-a or the donor UE 115-b) , and the configuration information may be forwarded to the UE 115-c via the multi-hop sidelink relay (e.g., via a PC5 RRC message) . In some examples, the configuration information may indicate a PC5 RLC channel configuration for the PC5 link indicated by the request (e.g., the sidelink connection 210-d, the sidelink connection 210-e, or both) , may indicate which intermediate relay UE the configuration information is intended for (e.g., an indication to forward the configuration information to the UE 115-c via the multi-hop sidelink relay) , or both. Additionally, or alternatively, the configuration information may indicate to forward the PC5 RLC channel configuration to each intermediate relay UE included in the multi-hop sidelink relay. For example, the remote UE 115-a may forward the configuration information to the UE 115-c (e.g., the UE 115 which the configuration information is for) and the UE 115-c may forward the configuration information to a next intermediate relay UE, such as the intermediate relay UE 115-e. The UEs 115 of the multi-hop relay may continue to forward the configuration information such that each UE 115 of the multi-hop sidelink relay is aware of the PC5 RLC channel configuration for the new intermediate relay UE 115-c.
[0098] In some examples, the UE 115-c may have an established connection with a serving cell that is different from the serving cell of the remote UE 115-a. For example, the UE 115-c may be connected to a network entity 105-b via a Uu connection 225 (e.g., a previously-established Uu connection) , and may receive a request to join the multi-hop sidelink relay between the network entity 105-a and the remote UE 115-a. In some examples, the UE 115-c may receive the request from a previous UE 115 of the multi-hop sidelink relay (e.g., a UE 115 having a direct sidelink connection 210 with the UE 115-c after joining the multi-hop sidelink relay, which may be referred to as a second UE) , for example from the remote UE 115-a or an adjacent intermediate relay UE in the direction of the remote UE 115-a. The UE 115-c may receive the request to establish the relay connection, and may determine whether to accept or reject the request based on the UE 115-c being connected with the network entity 105-b that is different than the network entity 105-a.
[0099] In a first example, the UE 115-c may determine to accept the request, and may transmit, to the network entity 105-b, a second request (e.g., an RRC message) to establish the relay connection between the UE 115-c and the previous UE 115 of the multi-hop sidelink relay. The second request may indicate information associated with the multi-hop sidelink relay, such as an ID of the network entity 105-a (e.g., a target cell ID) , information associated with the previous UE 115 (e.g., an ID of the previous UE 115) , or both. In some cases, the UE 115-c may receive a discovery message from the previous UE 115 including an ID of the previous UE 115, and the UE 115-c may determine (e.g., derive) the ID of the network entity 105-a based on information included in the discovery message, where inclusion of the ID of the network entity 105-a may be based on the determination of the ID using the information in the discovery message.
[0100] In some examples, the second request may further include measurement results for a PC5 link within the multi-hop sidelink relay (e.g., a measurement of the sidelink connection 210-d) , an ID (e.g., layer-2 ID) associated with the donor UE 115-b of the multi-hop sidelink relay, an ID (e.g., layer-2 ID) associated with the remote UE 115-a (which may be the ID of the previous UE 115 when the remote UE 115-a is the previous UE 115) , a purpose for establishing the relay connection between the UE 115-c and the previous UE 115 (e.g., a switching purpose, such as to setup a relay connection for the remote UE 115-a) , or any combination thereof. In some cases, the second request may be included in an RRC message to the network entity 105-b transmitted via the Uu connection 225, such as in a measurement report message or a UE assistance information message, among other examples. In some cases, the UE 115-c transmitting the second request may be based on a configuration received from the network entity 105-b. For example, the network entity 105-b may transmit an RRC message to the UE 115-c indicating that the UE 115-c is to report to the network entity 105-b in response to receipt of a relay connection setup request.
[0101] In some cases, transmitting the second request to the network entity 105-b may be based on an exchange between the UE 115-c and a parent relay UE 115 (e.g., a UE 115 of the multi-hop sidelink relay adjacent to the UE 115-c in the direction of the donor UE 115-b, such as the UE 115-e) . For example, the UE 115-c may transmit, to the parent relay UE 115 (which may be referred to as a third UE) and based on determining to accept the request, a third request to establish a second relay connection between the UE 115-c and the parent relay UE 115 (e.g., the sidelink connection 210-e) . The UE 115-c may receive a second response message from the parent relay UE 115 that indicates an acceptance, by the parent relay UE 115, to establish the second relay connection, and the UE 115-c may transmit the second request to the network entity 105-b based on receiving the acceptance from the parent relay UE 115. In some examples, the request messages and response messages between UEs 115 may be examples of sidelink control messages, such as PC5 RRC messages.
[0102] In a second example, the UE 115-c may determine to reject the request to establish the relay connection between the UE 115-c and the previous UE 115 of the multi-hop sidelink relay. In some cases, the UE 115-c may determine to reject the request based on having the Uu connection 225 with the network entity 105-b. For example, the UE 115-c may determine to reject the request based on being connected to a serving cell (e.g., the network entity 105-b) that is different than the serving cell of the remote UE 115-a (e.g., the network entity 105-a) . Additionally, or alternatively, the UE 115-c may determine to reject the request based on a configuration of the connection with the network entity 105-b, for example if the network entity 105-b configures the UE 115-c to not allow switching relay connections. As another example, the UE 115-c may determine to reject the request based on QoS constraints associated with ongoing traffic at the UE 115-c, such as if QoS requirements indicate low-latency service at the UE 115-c. Based on determining to reject the request, the UE 115-c may transmit the response (e.g., a PC5 RRC message) to the previous UE 115 indicating the rejection of the request to establish the relay connection between the UE 115-c and the previous UE 115. In some cases, the response may additionally include a reason for rejecting the request.
[0103] By communicating information associated with the intermediate relay UE 115-c to the network entity 105-a and determining whether to accept or reject a request to include the intermediate relay UE 115-c in the multi-hop sidelink relay between the network entity 105-a and the remote UE 115-a, functionality of the multi-hop sidelink relay may be improved by enhancing flexibility and robustness of the multi-hop sidelink relay when adding new intermediate relay UEs 115.
[0104] FIG. 3 shows an example of a process flow 300 that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure. The process flow 300 may implement, or be implemented by, one or more aspects of the wireless communications systems 100 and 200. For example, the process flow 300 illustrates signaling by and operations of a UE 115-f, a UE 115-g, a network entity 105-c, and a network entity 105-d, which may be examples of corresponding devices described with reference to FIGs. 1 and 2. In some examples, the UE 115-f (which may be referred to as a first UE) may be connected with the network entity 105-c (which may be referred to as a second network entity) and the UE 115-g (which may be referred to as a second UE) may be connected with the network entity 105-d (which may be referred to as a first network entity) . The UE 115-g may be included in a multi-hop sidelink relay between the network entity 105-d and a remote UE 115. For example, the UE 115-g may be the remote UE 115 or may be an intermediate relay UE of the multi-hop sidelink relay. In some examples, the process flow 300 may support the UE 115-g requesting to include the UE 115-f in the multi-hop sidelink relay, for example to improve the capability of the multi-hop sidelink relay to forward communications between the network entity 105-d and the remote UE 115.
[0105] At 305, the network entity 105-c may transmit a control signal to the UE 115-f. The control signal may indicate configuration information for the UE 115-f based on the UE 115-f being connected with the network entity 105-c. For example, the control signal may indicate for the UE 115-f to report to the network entity 105-c in response to receipt of a relay connection setup request.
[0106] At 310, the UE 115-g may transmit, to the UE 115-f, a discovery message (e.g., a sidelink discovery message) . The discovery message may include information associated with the UE 115-g. For example, the discovery message may indicate an ID of the UE 115-g. In some cases, the UE 115-f may determine (e.g., derive) an ID of the network entity 105-d (e.g., a serving cell associated with the UE 115-g) based on the information included in the discovery message.
[0107] At 315, the UE 115-g may transmit, to the UE 115-f, a first request to establish a relay connection between the UE 115-g and the UE 115-f, where the relay connection may be associated with a multi-hop sidelink relay between the network entity 105-d and the remote UE 115. In some cases, the UE 115-f may be a previous relay UE 115 of the multi-hop sidelink relay, which may refer to an adjacent relay UE in the direction of the remote UE 115.
[0108] At 320, the UE 115-f may determine whether to accept or reject the first request to establish the relay connection between the UE 115-g and the UE 115-f. In some cases, the determination may be based on the UE 115-f being connected with the network entity 105-c that is different than the network entity 105-d. For example, the UE 115-f may determine to reject the request based on the network entity 105-c being different than the network entity 105-d, the UE 115-f being unable to switch sidelink relay connections based on a configuration received from the network entity 105-c (e.g., the UE 115-f may not be allowed to switch to the relay connection) , a QoS associated with ongoing traffic at the UE 115-f (e.g., a low-latency service QoS constraint) , or any combination thereof. Alternatively, if the UE 115-f is capable of serving as an intermediate relay UE in the multi-hop sidelink relay, the UE 115-f may determine to accept the first request.
[0109] At 325, the UE 115-f may perform a handshake with a parent relay UE 115 (not shown) of the multi-hop sidelink relay. The parent relay UE 115 (which may be referred to as a third UE) may be an adjacent relay UE in the direction of a donor UE 115 of the multi-hop sidelink relay. The UE 115-f may perform the handshake based on determining to accept the first request. For example, the UE 115-f may transmit, to the parent relay UE 115, a third request to establish a second relay connection between the UE 115-f and the parent relay UE 115. The UE 115-f may receive, from the parent relay UE 115 and in response to the third request, a second response message that indicates an acceptance, by the parent relay UE 115, to establish the second relay connection between the UE 115-f and the parent relay UE 115. The third request and the second response message may be examples of sidelink RRC signals (e.g., PC5 RRC messages) .
[0110] At 330, the UE 115-f may transmit, to the network entity 105-c, a second request to establish the relay connection between the UE 115-f and the UE 115-g. In some cases, transmitting the second request may be based on the UE 115-f determining to accept the first request (e.g., at 320) , receiving the control signal from the network entity 105-c (e.g., at 305) , performing the handshake with the parent relay UE 115 (e.g., at 325) , or any combination thereof. The second request may include an ID associated with the network entity 105-d, a measurement of a sidelink channel within the multi-hop sidelink relay (e.g., a PC5 link between the UE 115-f and the UE 115-g) , an ID associated with a donor UE 115 of the multi-hop sidelink relay, an ID associated with the remote UE 115, an ID associated with the UE 115-g (which may be the ID of the remote UE 115 if the UE 115-g is the remote UE 115) , a purpose for establishing the relay connection between the UE 115-f and the UE 115-g, or any combination thereof. The second request may be included in a control signal, for example an RRC message, such as a measurement report message or a UE assistance information message, among other examples.
[0111] At 335, the UE 115-f may transmit, to the UE 115-g, a first response message indicating the acceptance or rejection of the first request based on determining whether to accept or reject the first request (e.g., at 320) . If the UE 115-f determines to reject the first request, the first response message may include a reason for the rejection. If the UE 115-f determines to accept the request, the UE 115-f may indicate the acceptance, which may result in the relay connection being established between the UE 115-f and the UE 115-g and the UE 115-f being included in the multi-hop sidelink relay between the network entity 105-d and the remote UE 115.
[0112] At 340, the UE 115-f may relay communications as part of the multi-hop sidelink relay. For example, the UE 115-f may forward signaling between the network entity 105-d and the remote UE 115 based on accepting the first request, establishing the relay connection between the UE 115-f and the UE 115-g, and establishing the second relay connection between the UE 115-f and the parent relay UE 115.
[0113] FIG. 4 shows an example of a process flow 400 that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure. The process flow 400 may implement, or be implemented by, one or more aspects of the wireless communications systems 100 and 200. For example, the process flow 400 illustrates signaling by and operations of a UE 115-h, a UE 115-i, a network entity 105-e, and a core network 401, which may be examples of corresponding devices described with reference to FIGs. 1 and 2. In some examples, the process flow 400 may support adding the UE 115-h (which may be referred to as a second UE) as an intermediate relay UE in a multi-hop sidelink relay between the network entity 105-e and a remote UE 115. In some cases, the UE 115-i (which may be referred to as a first UE) may be the remote UE 115 or the UE 115-i may be a donor UE 115 of the multi-hop sidelink relay (e.g., a UE 115 having a direction connection with the network entity 105-e) .
[0114] At 405, the UE 115-h may transmit, to the UE 115-i, a sidelink control message including first information associated with the UE 115-h, second information associated with a sidelink channel between the UE 115-h and an adjacent relay UE 115 within the multi-hop sidelink relay, or both. For example, the control message may include an identifier associated with the UE 115-h, a position of the UE 115-h in the multi-hop sidelink relay relative to the UE 115-i (e.g., an nth relay UE 115 from the UE 115-i after joining the multi-hop sidelink relay) , an ID associated with the sidelink channel between the UE 115-h and the adjacent relay UE 115 (e.g., the nth PC5 link from the UE 115-i) , a measurement of the sidelink channel between the UE 115-h and the adjacent relay UE 115, or any combination thereof. In some cases, the UE 115-h may transmit the control message to the UE 115-i via the multi-hop sidelink relay, such that one or more other intermediate relay UEs may forward to the control message from the UE 115-h to the UE 115-i. In such examples, the one or more other intermediate relay UEs may further include information associated with the one or more other intermediate relay UEs and information associated with relay connections between the one or more other intermediate relay UEs. The control message may be an example of a sidelink control message, such as a PC5 RRC message.
[0115] At 410, the UE 115-i may transmit, to the network entity 105-e, a request for configuration information for establishing a relay connection between the UE 115-h and the UE 115-i. The request may include the first information associated with the UE 115-h, the second information associated with the sidelink channel between the UE 115-h and the adjacent relay UE within the multi-hop sidelink relay, or both. For example, the request may indicate the ID of the UE 115-h (e.g., a layer-2 UE ID, a S-TMSI, a SUPI, an IP address, or any combination thereof) and the position of the UE 115-h in the multi-hop sidelink relay relative to the UE 115-i (e.g., the nth relay UE from the remote UE or the donor UE) . The request may further indicate the ID of the sidelink channel (which may be omitted if the information of the UE 115-h is included) and the measurement result of the sidelink channel (e.g., an SL-RSRP, SL-RSRQ, SD-RSRP, or any combination thereof) . In some cases, the request may be included in a control signal (e.g., a Uu RRC message) , such as a SidelinkUEInformation message.
[0116] At 415, the network entity 105-e may perform an authorization procedure based on receiving the request to establish the relay connection between the UE 115-h and the UE 115-i. For example, as part of the authorization procedure, the network entity 105-e may transmit, to the core network 401, a message indicating the ID associated with the UE 115-h and indicating that the UE 115-h is to be an intermediate relay UE within the multi-hop sidelink relay.
[0117] At 420, the core network 401 may transmit a second message in response to receiving the message from the network entity 105-e. For example, the core network 401 may verify the authorization information associated with the UE 115-h and may determine whether the UE 115-h is authorized as an intermediate relay UE for the multi-hop sidelink relay. In some cases, the core network 401 may transmit the second message indicating that the UE 115-h is authorized as an intermediate relay UE, which may result in the UE 115-h being included in the multi-hop sidelink relay.
[0118] At 425, the network entity 105-e may transmit, to the UE 115-i, the configuration information for establishing the relay connection between the UE 115-i and the UE 115-h. In some cases, the configuration information may include a configuration for a sidelink channel between the UE 115-h and an adjacent UE 115 within the multi-hop sidelink relay (e.g., a PC5 RLC channel configuration) . In some cases, the configuration information may include a first indication to forward the configuration information to the UE 115-h via the multi-hop sidelink relay. In some cases, the configuration information may include a second indication to forward the configuration information to each relay UE 115 that is included in the multi-hop sidelink relay.
[0119] At 430, the UE 115-i may forward, to the UE 115-h via the multi-hop sidelink relay, the configuration information. In some cases, forwarding the configuration information may result in the UE 115-h establishing the relay connection with the UE 115-i and participating in the multi-hop sidelink relay to relay communications between the network entity 105-e and the remote UE 115.
[0120] FIG. 5 shows a block diagram 500 of a device 505 that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure. The device 505 may be an example of aspects of a UE 115 as described herein. The device 505 may include a receiver 510, a transmitter 515, and a communications manager 520. The device 505, or one or more components of the device 505 (e.g., the receiver 510, the transmitter 515, the communications manager 520) , may include at least one processor, which may be coupled with at least one memory, to, individually or collectively, support or enable the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .
[0121] The receiver 510 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to techniques for multi-hop sidelink relay configurations ) . Information may be passed on to other components of the device 505. The receiver 510 may utilize a single antenna or a set of multiple antennas.
[0122] The transmitter 515 may provide a means for transmitting signals generated by other components of the device 505. For example, the transmitter 515 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to techniques for multi-hop sidelink relay configurations ) . In some examples, the transmitter 515 may be co-located with a receiver 510 in a transceiver module. The transmitter 515 may utilize a single antenna or a set of multiple antennas.
[0123] The communications manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be examples of means for performing various aspects of techniques for multi-hop sidelink relay configurations as described herein. For example, the communications manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be capable of performing one or more of the functions described herein.
[0124] In some examples, the communications manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) . The hardware may include at least one of a processor, a digital signal processor (DSP) , a central processing unit (CPU) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure. In some examples, at least one processor and at least one memory coupled with the at least one processor may be configured to perform one or more of the functions described herein (e.g., by one or more processors, individually or collectively, executing instructions stored in the at least one memory) .
[0125] Additionally, or alternatively, the communications manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be implemented in code (e.g., as communications management software or firmware) executed by at least one processor (e.g., referred to as a processor-executable code) . If implemented in code executed by at least one processor, the functions of the communications manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be performed by a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure) .
[0126] In some examples, the communications manager 520 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 510, the transmitter 515, or both. For example, the communications manager 520 may receive information from the receiver 510, send information to the transmitter 515, or be integrated in combination with the receiver 510, the transmitter 515, or both to obtain information, output information, or perform various other operations as described herein.
[0127] The communications manager 520 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 520 is capable of, configured to, or operable to support a means for receiving, from a second UE, a first request to establish a relay connection between the first UE and the second UE, where the relay connection is associated with a multi-hop sidelink relay between a first network entity and a remote UE. The communications manager 520 is capable of, configured to, or operable to support a means for transmitting, to the second UE, a first response message indicating an acceptance of the first request or a rejection of the first request based on a determination of whether to accept or reject the first request, where the determination is based on the first UE being connected with a second network entity that is different than the first network entity.
[0128] Additionally, or alternatively, the communications manager 520 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 520 is capable of, configured to, or operable to support a means for transmitting, to a network entity, a request for configuration information for establishing a relay connection between the first UE and a second UE, where the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE. The communications manager 520 is capable of, configured to, or operable to support a means for receiving, from the network entity, a control signal including the configuration information based on transmitting the request. The communications manager 520 is capable of, configured to, or operable to support a means for transmitting, to the second UE via the multi-hop sidelink relay, the configuration information to establish the relay connection between the first UE and the second UE, where the second UE is included in the multi-hop sidelink relay based on the configuration information.
[0129] By including or configuring the communications manager 520 in accordance with examples as described herein, the device 505 (e.g., at least one processor controlling or otherwise coupled with the receiver 510, the transmitter 515, the communications manager 520, or a combination thereof) may support techniques for communicating signaling to include a new intermediate relay UE in an established multi-hop sidelink relay, which may improve robustness and flexibility of the multi-hop sidelink relay.
[0130] FIG. 6 shows a block diagram 600 of a device 605 that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure. The device 605 may be an example of aspects of a device 505 or a UE 115 as described herein. The device 605 may include a receiver 610, a transmitter 615, and a communications manager 620. The device 605, or one of more components of the device 605 (e.g., the receiver 610, the transmitter 615, the communications manager 620) , may include at least one processor, which may be coupled with at least one memory, to support the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .
[0131] The receiver 610 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to techniques for multi-hop sidelink relay configurations ) . Information may be passed on to other components of the device 605. The receiver 610 may utilize a single antenna or a set of multiple antennas.
[0132] The transmitter 615 may provide a means for transmitting signals generated by other components of the device 605. For example, the transmitter 615 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to techniques for multi-hop sidelink relay configurations ) . In some examples, the transmitter 615 may be co-located with a receiver 610 in a transceiver module. The transmitter 615 may utilize a single antenna or a set of multiple antennas.
[0133] The device 605, or various components thereof, may be an example of means for performing various aspects of techniques for multi-hop sidelink relay configurations as described herein. For example, the communications manager 620 may include a sidelink communication component 625, an uplink communication component 630, a downlink communication component 635, or any combination thereof. The communications manager 620 may be an example of aspects of a communications manager 520 as described herein. In some examples, the communications manager 620, or various components thereof, may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 610, the transmitter 615, or both. For example, the communications manager 620 may receive information from the receiver 610, send information to the transmitter 615, or be integrated in combination with the receiver 610, the transmitter 615, or both to obtain information, output information, or perform various other operations as described herein.
[0134] The communications manager 620 may support wireless communications in accordance with examples as disclosed herein. The sidelink communication component 625 is capable of, configured to, or operable to support a means for receiving, from a second UE, a first request to establish a relay connection between the first UE and the second UE, where the relay connection is associated with a multi-hop sidelink relay between a first network entity and a remote UE. The sidelink communication component 625 is capable of, configured to, or operable to support a means for transmitting, to the second UE, a first response message indicating an acceptance of the first request or a rejection of the first request based on a determination of whether to accept or reject the first request, where the determination is based on the first UE being connected with a second network entity that is different than the first network entity.
[0135] Additionally, or alternatively, the communications manager 620 may support wireless communications in accordance with examples as disclosed herein. The uplink communication component 630 is capable of, configured to, or operable to support a means for transmitting, to a network entity, a request for configuration information for establishing a relay connection between the first UE and a second UE, where the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE. The downlink communication component 635 is capable of, configured to, or operable to support a means for receiving, from the network entity, a control signal including the configuration information based on transmitting the request. The sidelink communication component 625 is capable of, configured to, or operable to support a means for transmitting, to the second UE via the multi-hop sidelink relay, the configuration information to establish the relay connection between the first UE and the second UE, where the second UE is included in the multi-hop sidelink relay based on the configuration information.
[0136] FIG. 7 shows a block diagram 700 of a communications manager 720 that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure. The communications manager 720 may be an example of aspects of a communications manager 520, a communications manager 620, or both, as described herein. The communications manager 720, or various components thereof, may be an example of means for performing various aspects of techniques for multi-hop sidelink relay configurations as described herein. For example, the communications manager 720 may include a sidelink communication component 725, an uplink communication component 730, a downlink communication component 735, an information analysis component 740, or any combination thereof. Each of these components, or components or subcomponents thereof (e.g., one or more processors, one or more memories) , may communicate, directly or indirectly, with one another (e.g., via one or more buses) .
[0137] The communications manager 720 may support wireless communications in accordance with examples as disclosed herein. The sidelink communication component 725 is capable of, configured to, or operable to support a means for receiving, from a second UE, a first request to establish a relay connection between the first UE and the second UE, where the relay connection is associated with a multi-hop sidelink relay between a first network entity and a remote UE. In some examples, the sidelink communication component 725 is capable of, configured to, or operable to support a means for transmitting, to the second UE, a first response message indicating an acceptance of the first request or a rejection of the first request based on a determination of whether to accept or reject the first request, where the determination is based on the first UE being connected with a second network entity that is different than the first network entity.
[0138] In some examples, the uplink communication component 730 is capable of, configured to, or operable to support a means for transmitting, to the second network entity, a second request to establish the relay connection between the first UE and the second UE, where transmission of the second request is based on a determination to accept the first request.
[0139] In some examples, the second request includes an identifier associated with the first network entity, a measurement of a sidelink channel within the multi-hop sidelink relay, an identifier associated with a donor UE of the multi-hop sidelink relay, an identifier associated with the remote UE, an identifier associated with the second UE, a purpose for establishing the relay connection between the first UE and the second UE, or any combination thereof.
[0140] In some examples, the sidelink communication component 725 is capable of, configured to, or operable to support a means for receiving, from the second UE, a discovery message indicating the identifier associated with the second UE, where inclusion of the identifier associated with the second UE in the second request is based on receipt of the discovery message. In some examples, the information analysis component 740 is capable of, configured to, or operable to support a means for determining the identifier associated with the first network entity based on receipt of the discovery message, where inclusion of the identifier associated with the first network entity in the second request is based on determination of the identifier.
[0141] In some examples, the second request includes a radio resource control message. In some examples, the radio resource control message is a measurement report message or a UE assistance information message.
[0142] In some examples, the downlink communication component 735 is capable of, configured to, or operable to support a means for receiving, from the second network entity, a control signal that indicates for the first UE to report to the second network entity in response to receipt of a relay connection setup request, where transmission of the second request is based on receipt of the control signal.
[0143] In some examples, the sidelink communication component 725 is capable of, configured to, or operable to support a means for transmitting, to a third UE and based on a determination to accept the first request, a third request to establish a second relay connection between the first UE and the third UE, where the third UE is included in the multi-hop sidelink relay between the first network entity and the remote UE. In some examples, the sidelink communication component 725 is capable of, configured to, or operable to support a means for receiving, from the third UE and in response to the third request, a second response message that indicates an acceptance, by the third UE, to establish the second relay connection between the first UE and the third UE, where transmission of the second request is based on receipt of the second response message.
[0144] In some examples, the third request and the second response message include sidelink radio resource control signals.
[0145] In some examples, to support transmitting the first response message, the sidelink communication component 725 is capable of, configured to, or operable to support a means for indicating the rejection of the first request based on a determination to reject the first request, where the first response message includes a reason for the rejection of the first request.
[0146] In some examples, the reason for the rejection of the first request includes the second network entity being different than the first network entity, the first UE being unable to switch sidelink relay connections based on a configuration received from the second network entity, a quality-of-service associated with ongoing traffic at the first UE, or any combination thereof.
[0147] In some examples, the second UE includes a second intermediate relay UE of the multi-hop sidelink relay, or the second UE includes the remote UE.
[0148] Additionally, or alternatively, the communications manager 720 may support wireless communications in accordance with examples as disclosed herein. The uplink communication component 730 is capable of, configured to, or operable to support a means for transmitting, to a network entity, a request for configuration information for establishing a relay connection between the first UE and a second UE, where the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE. The downlink communication component 735 is capable of, configured to, or operable to support a means for receiving, from the network entity, a control signal including the configuration information based on transmitting the request. In some examples, the sidelink communication component 725 is capable of, configured to, or operable to support a means for transmitting, to the second UE via the multi-hop sidelink relay, the configuration information to establish the relay connection between the first UE and the second UE, where the second UE is included in the multi-hop sidelink relay based on the configuration information.
[0149] In some examples, the request for the configuration information further includes first information associated with the second UE, second information associated with a sidelink channel between the second UE and an adjacent relay UE within the multi-hop sidelink relay, or both.
[0150] In some examples, the first information includes an identifier associated with the second UE and a position of the second UE within the multi-hop sidelink relay; and the second information includes an identifier associated with the sidelink channel between the second UE and the adjacent relay UE, a measurement of the sidelink channel between the second UE and the adjacent relay UE, or both.
[0151] In some examples, the sidelink communication component 725 is capable of, configured to, or operable to support a means for receiving, from the second UE via the multi-hop sidelink relay, a sidelink control message including the first information and the second information, where the request includes the first information and the second information based on receiving the sidelink control message.
[0152] In some examples, the configuration information includes a configuration for a sidelink channel between the second UE and an adjacent UE within the multi-hop sidelink relay and a first indication to forward the configuration information to the second UE via the multi-hop sidelink relay.
[0153] In some examples, the configuration information further includes a second indication to forward the configuration information to each relay UE that is included in the multi-hop sidelink relay.
[0154] FIG. 8 shows a diagram of a system 800 including a device 805 that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure. The device 805 may be an example of or include components of a device 505, a device 605, or a UE 115 as described herein. The device 805 may communicate (e.g., wirelessly) with one or more other devices (e.g., network entities 105, UEs 115, or a combination thereof) . The device 805 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager 820, an input / output (I / O) controller, such as an I / O controller 810, a transceiver 815, one or more antennas 825, at least one memory 830, code 835, and at least one processor 840. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 845) .
[0155] The I / O controller 810 may manage input and output signals for the device 805. The I / O controller 810 may also manage peripherals not integrated into the device 805. In some cases, the I / O controller 810 may represent a physical connection or port to an external peripheral. In some cases, the I / O controller 810 may utilize an operating system such as or another known operating system. Additionally, or alternatively, the I / O controller 810 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I / O controller 810 may be implemented as part of one or more processors, such as the at least one processor 840. In some cases, a user may interact with the device 805 via the I / O controller 810 or via hardware components controlled by the I / O controller 810.
[0156] In some cases, the device 805 may include a single antenna. However, in some other cases, the device 805 may have more than one antenna, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 815 may communicate bi-directionally via the one or more antennas 825 using wired or wireless links as described herein. For example, the transceiver 815 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 815 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 825 for transmission, and to demodulate packets received from the one or more antennas 825. The transceiver 815, or the transceiver 815 and one or more antennas 825, may be an example of a transmitter 515, a transmitter 615, a receiver 510, a receiver 610, or any combination thereof or component thereof, as described herein.
[0157] The at least one memory 830 may include random access memory (RAM) and read-only memory (ROM) . The at least one memory 830 may store computer-readable, computer-executable, or processor-executable code, such as the code 835. The code 835 may include instructions that, when executed by the at least one processor 840, cause the device 805 to perform various functions described herein. The code 835 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code 835 may not be directly executable by the at least one processor 840 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the at least one memory 830 may include, among other things, a basic I / O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
[0158] The at least one processor 840 may include one or more intelligent hardware devices (e.g., one or more general-purpose processors, one or more DSPs, one or more CPUs, one or more graphics processing units (GPUs) , one or more neural processing units (NPUs) (also referred to as neural network processors or deep learning processors (DLPs) ) , one or more microcontrollers, one or more ASICs, one or more FPGAs, one or more programmable logic devices, discrete gate or transistor logic, one or more discrete hardware components, or any combination thereof) . In some cases, the at least one processor 840 may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into the at least one processor 840. The at least one processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., the at least one memory 830) to cause the device 805 to perform various functions (e.g., functions or tasks supporting techniques for multi-hop sidelink relay configurations ) . For example, the device 805 or a component of the device 805 may include at least one processor 840 and at least one memory 830 coupled with or to the at least one processor 840, the at least one processor 840 and the at least one memory 830 configured to perform various functions described herein.
[0159] In some examples, the at least one processor 840 may include multiple processors and the at least one memory 830 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions described herein. In some examples, the at least one processor 840 may be a component of a processing system, which may refer to a system (such as a series) of machines, circuitry (including, for example, one or both of processor circuitry (which may include the at least one processor 840) and memory circuitry (which may include the at least one memory 830) ) , or components, that receives or obtains inputs and processes the inputs to produce, generate, or obtain a set of outputs. The processing system may be configured to perform one or more of the functions described herein. For example, the at least one processor 840 or a processing system including the at least one processor 840 may be configured to, configurable to, or operable to cause the device 805 to perform one or more of the functions described herein. Further, as described herein, being “configured to, ” being “configurable to, ” and being “operable to” may be used interchangeably and may be associated with a capability, when executing code 835 (e.g., processor-executable code) stored in the at least one memory 830 or otherwise, to perform one or more of the functions described herein.
[0160] The communications manager 820 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 820 is capable of, configured to, or operable to support a means for receiving, from a second UE, a first request to establish a relay connection between the first UE and the second UE, where the relay connection is associated with a multi-hop sidelink relay between a first network entity and a remote UE. The communications manager 820 is capable of, configured to, or operable to support a means for transmitting, to the second UE, a first response message indicating an acceptance of the first request or a rejection of the first request based on a determination of whether to accept or reject the first request, where the determination is based on the first UE being connected with a second network entity that is different than the first network entity.
[0161] Additionally, or alternatively, the communications manager 820 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 820 is capable of, configured to, or operable to support a means for transmitting, to a network entity, a request for configuration information for establishing a relay connection between the first UE and a second UE, where the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE. The communications manager 820 is capable of, configured to, or operable to support a means for receiving, from the network entity, a control signal including the configuration information based on transmitting the request. The communications manager 820 is capable of, configured to, or operable to support a means for transmitting, to the second UE via the multi-hop sidelink relay, the configuration information to establish the relay connection between the first UE and the second UE, where the second UE is included in the multi-hop sidelink relay based on the configuration information.
[0162] By including or configuring the communications manager 820 in accordance with examples as described herein, the device 805 may support techniques for communicating signaling to include a new intermediate relay UE in an established multi-hop sidelink relay, which may improve robustness and flexibility of the multi-hop sidelink relay.
[0163] In some examples, the communications manager 820 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver 815, the one or more antennas 825, or any combination thereof. Although the communications manager 820 is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager 820 may be supported by or performed by the at least one processor 840, the at least one memory 830, the code 835, or any combination thereof. For example, the code 835 may include instructions executable by the at least one processor 840 to cause the device 805 to perform various aspects of techniques for multi-hop sidelink relay configurations as described herein, or the at least one processor 840 and the at least one memory 830 may be otherwise configured to, individually or collectively, perform or support such operations.
[0164] FIG. 9 shows a block diagram 900 of a device 905 that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure. The device 905 may be an example of aspects of a network entity 105 as described herein. The device 905 may include a receiver 910, a transmitter 915, and a communications manager 920. The device 905, or one or more components of the device 905 (e.g., the receiver 910, the transmitter 915, the communications manager 920) , may include at least one processor, which may be coupled with at least one memory, to, individually or collectively, support or enable the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .
[0165] The receiver 910 may provide a means for obtaining (e.g., receiving, determining, identifying) information such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack) . Information may be passed on to other components of the device 905. In some examples, the receiver 910 may support obtaining information by receiving signals via one or more antennas. Additionally, or alternatively, the receiver 910 may support obtaining information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.
[0166] The transmitter 915 may provide a means for outputting (e.g., transmitting, providing, conveying, sending) information generated by other components of the device 905. For example, the transmitter 915 may output information such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack) . In some examples, the transmitter 915 may support outputting information by transmitting signals via one or more antennas. Additionally, or alternatively, the transmitter 915 may support outputting information by transmitting signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof. In some examples, the transmitter 915 and the receiver 910 may be co-located in a transceiver, which may include or be coupled with a modem.
[0167] The communications manager 920, the receiver 910, the transmitter 915, or various combinations or components thereof may be examples of means for performing various aspects of techniques for multi-hop sidelink relay configurations as described herein. For example, the communications manager 920, the receiver 910, the transmitter 915, or various combinations or components thereof may be capable of performing one or more of the functions described herein.
[0168] In some examples, the communications manager 920, the receiver 910, the transmitter 915, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) . The hardware may include at least one of a processor, a DSP, a CPU, an ASIC, an FPGA or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure. In some examples, at least one processor and at least one memory coupled with the at least one processor may be configured to perform one or more of the functions described herein (e.g., by one or more processors, individually or collectively, executing instructions stored in the at least one memory) .
[0169] Additionally, or alternatively, the communications manager 920, the receiver 910, the transmitter 915, or various combinations or components thereof may be implemented in code (e.g., as communications management software or firmware) executed by at least one processor (e.g., referred to as a processor-executable code) . If implemented in code executed by at least one processor, the functions of the communications manager 920, the receiver 910, the transmitter 915, or various combinations or components thereof may be performed by a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure) .
[0170] In some examples, the communications manager 920 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 910, the transmitter 915, or both. For example, the communications manager 920 may receive information from the receiver 910, send information to the transmitter 915, or be integrated in combination with the receiver 910, the transmitter 915, or both to obtain information, output information, or perform various other operations as described herein.
[0171] The communications manager 920 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 920 is capable of, configured to, or operable to support a means for receiving, from a first UE, a request for configuration information for establishing a relay connection between the first UE and a second UE, where the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE. The communications manager 920 is capable of, configured to, or operable to support a means for performing an authorization procedure to determine whether to accept or reject the request. The communications manager 920 is capable of, configured to, or operable to support a means for transmitting the configuration information to establish the relay connection between the first UE and the second UE based on an acceptance of the request, where the second UE is included in the multi-hop sidelink relay between the network entity and the remote UE based on the configuration information.
[0172] By including or configuring the communications manager 920 in accordance with examples as described herein, the device 905 (e.g., at least one processor controlling or otherwise coupled with the receiver 910, the transmitter 915, the communications manager 920, or a combination thereof) may support techniques for communicating signaling to include a new intermediate relay UE in an established multi-hop sidelink relay, which may improve robustness and flexibility of the multi-hop sidelink relay.
[0173] FIG. 10 shows a block diagram 1000 of a device 1005 that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure. The device 1005 may be an example of aspects of a device 905 or a network entity 105 as described herein. The device 1005 may include a receiver 1010, a transmitter 1015, and a communications manager 1020. The device 1005, or one of more components of the device 1005 (e.g., the receiver 1010, the transmitter 1015, the communications manager 1020) , may include at least one processor, which may be coupled with at least one memory, to support the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .
[0174] The receiver 1010 may provide a means for obtaining (e.g., receiving, determining, identifying) information such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack) . Information may be passed on to other components of the device 1005. In some examples, the receiver 1010 may support obtaining information by receiving signals via one or more antennas. Additionally, or alternatively, the receiver 1010 may support obtaining information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.
[0175] The transmitter 1015 may provide a means for outputting (e.g., transmitting, providing, conveying, sending) information generated by other components of the device 1005. For example, the transmitter 1015 may output information such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack) . In some examples, the transmitter 1015 may support outputting information by transmitting signals via one or more antennas. Additionally, or alternatively, the transmitter 1015 may support outputting information by transmitting signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof. In some examples, the transmitter 1015 and the receiver 1010 may be co-located in a transceiver, which may include or be coupled with a modem.
[0176] The device 1005, or various components thereof, may be an example of means for performing various aspects of techniques for multi-hop sidelink relay configurations as described herein. For example, the communications manager 1020 may include a signal reception component 1025, an authorization component 1030, a signal transmission component 1035, or any combination thereof. The communications manager 1020 may be an example of aspects of a communications manager 920 as described herein. In some examples, the communications manager 1020, or various components thereof, may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 1010, the transmitter 1015, or both. For example, the communications manager 1020 may receive information from the receiver 1010, send information to the transmitter 1015, or be integrated in combination with the receiver 1010, the transmitter 1015, or both to obtain information, output information, or perform various other operations as described herein.
[0177] The communications manager 1020 may support wireless communications in accordance with examples as disclosed herein. The signal reception component 1025 is capable of, configured to, or operable to support a means for receiving, from a first UE, a request for configuration information for establishing a relay connection between the first UE and a second UE, where the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE. The authorization component 1030 is capable of, configured to, or operable to support a means for performing an authorization procedure to determine whether to accept or reject the request. The signal transmission component 1035 is capable of, configured to, or operable to support a means for transmitting the configuration information to establish the relay connection between the first UE and the second UE based on an acceptance of the request, where the second UE is included in the multi-hop sidelink relay between the network entity and the remote UE based on the configuration information.
[0178] FIG. 11 shows a block diagram 1100 of a communications manager 1120 that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure. The communications manager 1120 may be an example of aspects of a communications manager 920, a communications manager 1020, or both, as described herein. The communications manager 1120, or various components thereof, may be an example of means for performing various aspects of techniques for multi-hop sidelink relay configurations as described herein. For example, the communications manager 1120 may include a signal reception component 1125, an authorization component 1130, a signal transmission component 1135, or any combination thereof. Each of these components, or components or subcomponents thereof (e.g., one or more processors, one or more memories) , may communicate, directly or indirectly, with one another (e.g., via one or more buses) . The communications may include communications within a protocol layer of a protocol stack, communications associated with a logical channel of a protocol stack (e.g., between protocol layers of a protocol stack, within a device, component, or virtualized component associated with a network entity 105, between devices, components, or virtualized components associated with a network entity 105) , or any combination thereof.
[0179] The communications manager 1120 may support wireless communications in accordance with examples as disclosed herein. The signal reception component 1125 is capable of, configured to, or operable to support a means for receiving, from a first UE, a request for configuration information for establishing a relay connection between the first UE and a second UE, where the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE. The authorization component 1130 is capable of, configured to, or operable to support a means for performing an authorization procedure to determine whether to accept or reject the request. The signal transmission component 1135 is capable of, configured to, or operable to support a means for transmitting the configuration information to establish the relay connection between the first UE and the second UE based on an acceptance of the request, where the second UE is included in the multi-hop sidelink relay between the network entity and the remote UE based on the configuration information.
[0180] In some examples, the configuration information includes a configuration for a sidelink channel between the second UE and an adjacent UE within the multi-hop sidelink relay and an indication to forward the configuration information to the second UE via the multi-hop sidelink relay.
[0181] In some examples, the configuration information further includes a second indication to forward the configuration information to each relay UE that is included in the multi-hop sidelink relay.
[0182] In some examples, the request for the configuration information includes an identifier associated with the second UE, a position of the second UE within the multi-hop sidelink relay, an identifier associated with a sidelink channel between the second UE and an adjacent relay UE within the multi-hop sidelink relay, a measurement of the sidelink channel between the second UE and the adjacent relay UE, or any combination thereof.
[0183] In some examples, to support performing the authorization procedure, the authorization component 1130 is capable of, configured to, or operable to support a means for transmitting, to a core network associated with the network entity, a message indicating the identifier associated with the second UE and indicating that the second UE is an intermediate relay UE within the multi-hop sidelink relay. In some examples, to support performing the authorization procedure, the authorization component 1130 is capable of, configured to, or operable to support a means for receiving, from the core network, a second message indicating whether the second UE is authorized as an intermediate relay UE for the multi-hop sidelink relay, where transmitting the configuration information is based on the second message indicating that the second UE is authorized.
[0184] In some examples, the first UE is a donor relay UE of the multi-hop sidelink relay; or the first UE is the remote UE.
[0185] FIG. 12 shows a diagram of a system 1200 including a device 1205 that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure. The device 1205 may be an example of or include components of a device 905, a device 1005, or a network entity 105 as described herein. The device 1205 may communicate with other network devices or network equipment such as one or more of the network entities 105, UEs 115, or any combination thereof. The communications may include communications over one or more wired interfaces, over one or more wireless interfaces, or any combination thereof. The device 1205 may include components that support outputting and obtaining communications, such as a communications manager 1220, a transceiver 1210, one or more antennas 1215, at least one memory 1225, code 1230, and at least one processor 1235. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 1240) .
[0186] The transceiver 1210 may support bi-directional communications via wired links, wireless links, or both as described herein. In some examples, the transceiver 1210 may include a wired transceiver and may communicate bi-directionally with another wired transceiver. Additionally, or alternatively, in some examples, the transceiver 1210 may include a wireless transceiver and may communicate bi-directionally with another wireless transceiver. In some examples, the device 1205 may include one or more antennas 1215, which may be capable of transmitting or receiving wireless transmissions (e.g., concurrently) . The transceiver 1210 may also include a modem to modulate signals, to provide the modulated signals for transmission (e.g., by one or more antennas 1215, by a wired transmitter) , to receive modulated signals (e.g., from one or more antennas 1215, from a wired receiver) , and to demodulate signals. In some implementations, the transceiver 1210 may include one or more interfaces, such as one or more interfaces coupled with the one or more antennas 1215 that are configured to support various receiving or obtaining operations, or one or more interfaces coupled with the one or more antennas 1215 that are configured to support various transmitting or outputting operations, or a combination thereof. In some implementations, the transceiver 1210 may include or be configured for coupling with one or more processors or one or more memory components that are operable to perform or support operations based on received or obtained information or signals, or to generate information or other signals for transmission or other outputting, or any combination thereof. In some implementations, the transceiver 1210, or the transceiver 1210 and the one or more antennas 1215, or the transceiver 1210 and the one or more antennas 1215 and one or more processors or one or more memory components (e.g., the at least one processor 1235, the at least one memory 1225, or both) , may be included in a chip or chip assembly that is installed in the device 1205. In some examples, the transceiver 1210 may be operable to support communications via one or more communications links (e.g., communication link (s) 125, backhaul communication link (s) 120, a midhaul communication link 162, a fronthaul communication link 168) .
[0187] The at least one memory 1225 may include RAM, ROM, or any combination thereof. The at least one memory 1225 may store computer-readable, computer-executable, or processor-executable code, such as the code 1230. The code 1230 may include instructions that, when executed by one or more of the at least one processor 1235, cause the device 1205 to perform various functions described herein. The code 1230 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code 1230 may not be directly executable by a processor of the at least one processor 1235 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the at least one memory 1225 may include, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices. In some examples, the at least one processor 1235 may include multiple processors and the at least one memory 1225 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories which may, individually or collectively, be configured to perform various functions herein (for example, as part of a processing system) .
[0188] The at least one processor 1235 may include one or more intelligent hardware devices (e.g., one or more general-purpose processors, one or more DSPs, one or more CPUs, one or more graphics processing units (GPUs) , one or more neural processing units (NPUs) (also referred to as neural network processors or deep learning processors (DLPs) ) , one or more microcontrollers, one or more ASICs, one or more FPGAs, one or more programmable logic devices, discrete gate or transistor logic, one or more discrete hardware components, or any combination thereof) . In some cases, the at least one processor 1235 may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into one or more of the at least one processor 1235. The at least one processor 1235 may be configured to execute computer-readable instructions stored in a memory (e.g., one or more of the at least one memory 1225) to cause the device 1205 to perform various functions (e.g., functions or tasks supporting techniques for multi-hop sidelink relay configurations ) . For example, the device 1205 or a component of the device 1205 may include at least one processor 1235 and at least one memory 1225 coupled with one or more of the at least one processor 1235, the at least one processor 1235 and the at least one memory 1225 configured to perform various functions described herein. The at least one processor 1235 may be an example of a cloud-computing platform (e.g., one or more physical nodes and supporting software such as operating systems, virtual machines, or container instances) that may host the functions (e.g., by executing code 1230) to perform the functions of the device 1205. The at least one processor 1235 may be any one or more suitable processors capable of executing scripts or instructions of one or more software programs stored in the device 1205 (such as within one or more of the at least one memory 1225) .
[0189] In some examples, the at least one processor 1235 may include multiple processors and the at least one memory 1225 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein. In some examples, the at least one processor 1235 may be a component of a processing system, which may refer to a system (such as a series) of machines, circuitry (including, for example, one or both of processor circuitry (which may include the at least one processor 1235) and memory circuitry (which may include the at least one memory 1225) ) , or components, that receives or obtains inputs and processes the inputs to produce, generate, or obtain a set of outputs. The processing system may be configured to perform one or more of the functions described herein. For example, the at least one processor 1235 or a processing system including the at least one processor 1235 may be configured to, configurable to, or operable to cause the device 1205 to perform one or more of the functions described herein. Further, as described herein, being “configured to, ” being “configurable to, ” and being “operable to”may be used interchangeably and may be associated with a capability, when executing code stored in the at least one memory 1225 or otherwise, to perform one or more of the functions described herein.
[0190] In some examples, a bus 1240 may support communications of (e.g., within) a protocol layer of a protocol stack. In some examples, a bus 1240 may support communications associated with a logical channel of a protocol stack (e.g., between protocol layers of a protocol stack) , which may include communications performed within a component of the device 1205, or between different components of the device 1205 that may be co-located or located in different locations (e.g., where the device 1205 may refer to a system in which one or more of the communications manager 1220, the transceiver 1210, the at least one memory 1225, the code 1230, and the at least one processor 1235 may be located in one of the different components or divided between different components) .
[0191] In some examples, the communications manager 1220 may manage aspects of communications with a core network 130 (e.g., via one or more wired or wireless backhaul links) . For example, the communications manager 1220 may manage the transfer of data communications for client devices, such as one or more UEs 115. In some examples, the communications manager 1220 may manage communications with one or more other network entities 105, and may include a controller or scheduler for controlling communications with UEs 115 (e.g., in cooperation with the one or more other network devices) . In some examples, the communications manager 1220 may support an X2 interface within an LTE / LTE-Awireless communications network technology to provide communication between network entities 105.
[0192] The communications manager 1220 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 1220 is capable of, configured to, or operable to support a means for receiving, from a first UE, a request for configuration information for establishing a relay connection between the first UE and a second UE, where the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE. The communications manager 1220 is capable of, configured to, or operable to support a means for performing an authorization procedure to determine whether to accept or reject the request. The communications manager 1220 is capable of, configured to, or operable to support a means for transmitting the configuration information to establish the relay connection between the first UE and the second UE based on an acceptance of the request, where the second UE is included in the multi-hop sidelink relay between the network entity and the remote UE based on the configuration information.
[0193] By including or configuring the communications manager 1220 in accordance with examples as described herein, the device 1205 may support techniques for communicating signaling to include a new intermediate relay UE in an established multi-hop sidelink relay, which may improve robustness and flexibility of the multi-hop sidelink relay.
[0194] In some examples, the communications manager 1220 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the transceiver 1210, the one or more antennas 1215 (e.g., where applicable) , or any combination thereof. Although the communications manager 1220 is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager 1220 may be supported by or performed by the transceiver 1210, one or more of the at least one processor 1235, one or more of the at least one memory 1225, the code 1230, or any combination thereof (for example, by a processing system including at least a portion of the at least one processor 1235, the at least one memory 1225, the code 1230, or any combination thereof) . For example, the code 1230 may include instructions executable by one or more of the at least one processor 1235 to cause the device 1205 to perform various aspects of techniques for multi-hop sidelink relay configurations as described herein, or the at least one processor 1235 and the at least one memory 1225 may be otherwise configured to, individually or collectively, perform or support such operations.
[0195] FIG. 13 shows a flowchart illustrating a method 1300 that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure. The operations of the method 1300 may be implemented by a UE or its components as described herein. For example, the operations of the method 1300 may be performed by a UE 115 as described with reference to FIGs. 1 through 8. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.
[0196] At 1305, the method may include receiving, from a second UE, a first request to establish a relay connection between the first UE and the second UE, where the relay connection is associated with a multi-hop sidelink relay between a first network entity and a remote UE. The operations of 1305 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1305 may be performed by a sidelink communication component 725 as described with reference to FIG. 7.
[0197] At 1310, the method may include transmitting, to the second UE, a first response message indicating an acceptance of the first request or a rejection of the first request based on a determination of whether to accept or reject the first request, where the determination is based at least in part on the first UE being connected with a second network entity that is different than the first network entity. The operations of 1310 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1310 may be performed by a sidelink communication component 725 as described with reference to FIG. 7.
[0198] FIG. 14 shows a flowchart illustrating a method 1400 that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure. The operations of the method 1400 may be implemented by a UE or its components as described herein. For example, the operations of the method 1400 may be performed by a UE 115 as described with reference to FIGs. 1 through 8. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.
[0199] At 1405, the method may include transmitting, to a network entity, a request for configuration information for establishing a relay connection between the first UE and a second UE, where the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE. The operations of 1405 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1405 may be performed by an uplink communication component 730 as described with reference to FIG. 7.
[0200] At 1410, the method may include receiving, from the network entity, a control signal including the configuration information based at least in part on transmitting the request. The operations of 1410 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1410 may be performed by a downlink communication component 735 as described with reference to FIG. 7.
[0201] At 1415, the method may include transmitting, to the second UE via the multi-hop sidelink relay, the configuration information to establish the relay connection between the first UE and the second UE, where the second UE is included in the multi-hop sidelink relay based at least in part on the configuration information. The operations of 1415 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1415 may be performed by a sidelink communication component 725 as described with reference to FIG. 7.
[0202] FIG. 15 shows a flowchart illustrating a method 1500 that supports techniques for multi-hop sidelink relay configurations in accordance with one or more aspects of the present disclosure. The operations of the method 1500 may be implemented by a network entity or its components as described herein. For example, the operations of the method 1500 may be performed by a network entity as described with reference to FIGs. 1 through 4 and 9 through 12. In some examples, a network entity may execute a set of instructions to control the functional elements of the network entity to perform the described functions. Additionally, or alternatively, the network entity may perform aspects of the described functions using special-purpose hardware.
[0203] At 1505, the method may include receiving, from a first UE, a request for configuration information for establishing a relay connection between the first UE and a second UE, where the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE. The operations of 1505 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1505 may be performed by a signal reception component 1125 as described with reference to FIG. 11.
[0204] At 1510, the method may include performing an authorization procedure to determine whether to accept or reject the request. The operations of 1510 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1510 may be performed by an authorization component 1130 as described with reference to FIG. 11.
[0205] At 1515, the method may include transmitting the configuration information to establish the relay connection between the first UE and the second UE based at least in part on an acceptance of the request, where the second UE is included in the multi-hop sidelink relay between the network entity and the remote UE based on the configuration information. The operations of 1515 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1515 may be performed by a signal transmission component 1135 as described with reference to FIG. 11.
[0206] The following provides an overview of aspects of the present disclosure:
[0207] Aspect 1: A method for wireless communications by a first UE, comprising: receiving, from a second UE, a first request to establish a relay connection between the first UE and the second UE, wherein the relay connection is associated with a multi-hop sidelink relay between a first network entity and a remote UE; and transmitting, to the second UE, a first response message indicating an acceptance of the first request or a rejection of the first request based at least in part on a determination of whether to accept or reject the first request, wherein the determination is based at least in part on the first UE being connected with a second network entity that is different than the first network entity.
[0208] Aspect 2: The method of aspect 1, further comprising: transmitting, to the second network entity, a second request to establish the relay connection between the first UE and the second UE, wherein transmission of the second request is based at least in part on a determination to accept the first request.
[0209] Aspect 3: The method of aspect 2, wherein the second request comprises an identifier associated with the first network entity, a measurement of a sidelink channel within the multi-hop sidelink relay, an identifier associated with a donor UE of the multi-hop sidelink relay, an identifier associated with the remote UE, an identifier associated with the second UE, a purpose for establishing the relay connection between the first UE and the second UE, or any combination thereof.
[0210] Aspect 4: The method of aspect 3, further comprising: receiving, from the second UE, a discovery message indicating the identifier associated with the second UE, wherein inclusion of the identifier associated with the second UE in the second request is based at least in part on receipt of the discovery message; and determining the identifier associated with the first network entity based at least in part on receipt of the discovery message, wherein inclusion of the identifier associated with the first network entity in the second request is based at least in part on determination of the identifier.
[0211] Aspect 5: The method of any of aspects 3 through 4, wherein the second request comprises a radio resource control message, and the radio resource control message is a measurement report message or a UE assistance information message.
[0212] Aspect 6: The method of any of aspects 2 through 5, further comprising: receiving, from the second network entity, a control signal that indicates for the first UE to report to the second network entity in response to receipt of a relay connection setup request, wherein transmission of the second request is based at least in part on receipt of the control signal.
[0213] Aspect 7: The method of any of aspects 2 through 6, further comprising: transmitting, to a third UE and based at least in part on a determination to accept the first request, a third request to establish a second relay connection between the first UE and the third UE, wherein the third UE is included in the multi-hop sidelink relay between the first network entity and the remote UE; and receiving, from the third UE and in response to the third request, a second response message that indicates an acceptance, by the third UE, to establish the second relay connection between the first UE and the third UE, wherein transmission of the second request is based at least in part on receipt of the second response message.
[0214] Aspect 8: The method of aspect 7, wherein the third request and the second response message comprise sidelink radio resource control signals.
[0215] Aspect 9: The method of any of aspects 1 through 8, wherein transmitting the first response message comprises: indicating the rejection of the first request based at least in part on a determination to reject the first request, wherein the first response message comprises a reason for the rejection of the first request.
[0216] Aspect 10: The method of aspect 9, wherein the reason for the rejection of the first request comprises the second network entity being different than the first network entity, the first UE being unable to switch sidelink relay connections based at least in part on a configuration received from the second network entity, a quality-of-service associated with ongoing traffic at the first UE, or any combination thereof.
[0217] Aspect 11: The method of any of aspects 1 through 10, wherein the first UE comprises a first intermediate relay UE for the multi-hop sidelink relay, and wherein: the second UE comprises a second intermediate relay UE of the multi-hop sidelink relay; or the second UE comprises the remote UE.
[0218] Aspect 12: A method for wireless communications at a first UE, comprising: transmitting, to a network entity, a request for configuration information for establishing a relay connection between the first UE and a second UE, wherein the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE; receiving, from the network entity, a control signal comprising the configuration information based at least in part on transmitting the request; and transmitting, to the second UE via the multi-hop sidelink relay, the configuration information to establish the relay connection between the first UE and the second UE, wherein the second UE is included in the multi-hop sidelink relay based at least in part on the configuration information.
[0219] Aspect 13: The method of aspect 12, wherein the request for the configuration information further comprises first information associated with the second UE, second information associated with a sidelink channel between the second UE and an adjacent relay UE within the multi-hop sidelink relay, or both.
[0220] Aspect 14: The method of aspect 13, wherein the first information comprises an identifier associated with the second UE and a position of the second UE within the multi-hop sidelink relay; and the second information comprises an identifier associated with the sidelink channel between the second UE and the adjacent relay UE, a measurement of the sidelink channel between the second UE and the adjacent relay UE, or both.
[0221] Aspect 15: The method of any of aspects 13 through 14, further comprising: receiving, from the second UE via the multi-hop sidelink relay, a sidelink control message comprising the first information and the second information, wherein the request comprises the first information and the second information based at least in part on receiving the sidelink control message.
[0222] Aspect 16: The method of any of aspects 12 through 15, wherein the configuration information comprises a configuration for a sidelink channel between the second UE and an adjacent UE within the multi-hop sidelink relay and a first indication to forward the configuration information to the second UE via the multi-hop sidelink relay.
[0223] Aspect 17: The method of aspect 16, wherein the configuration information further comprises a second indication to forward the configuration information to each relay UE that is included in the multi-hop sidelink relay.
[0224] Aspect 18: A method for wireless communications at a network entity, comprising: receiving, from a first UE, a request for configuration information for establishing a relay connection between the first UE and a second UE, wherein the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE; performing an authorization procedure to determine whether to accept or reject the request; and transmitting the configuration information to establish the relay connection between the first UE and the second UE based at least in part on an acceptance of the request, wherein the second UE is included in the multi-hop sidelink relay between the network entity and the remote UE based at least in part on the configuration information.
[0225] Aspect 19: The method of aspect 18, wherein the configuration information comprises a configuration for a sidelink channel between the second UE and an adjacent UE within the multi-hop sidelink relay and an indication to forward the configuration information to the second UE via the multi-hop sidelink relay.
[0226] Aspect 20: The method of aspect 19, wherein the configuration information further comprises a second indication to forward the configuration information to each relay UE that is included in the multi-hop sidelink relay.
[0227] Aspect 21: The method of any of aspects 18 through 20, wherein the request for the configuration information comprises an identifier associated with the second UE, a position of the second UE within the multi-hop sidelink relay, an identifier associated with a sidelink channel between the second UE and an adjacent relay UE within the multi-hop sidelink relay, a measurement of the sidelink channel between the second UE and the adjacent relay UE, or any combination thereof.
[0228] Aspect 22: The method of aspect 21, wherein performing the authorization procedure comprises: transmitting, to a core network associated with the network entity, a message indicating the identifier associated with the second UE and indicating that the second UE is an intermediate relay UE within the multi-hop sidelink relay; and receiving, from the core network, a second message indicating whether the second UE is authorized as an intermediate relay UE for the multi-hop sidelink relay, wherein transmitting the configuration information is based at least in part on the second message indicating that the second UE is authorized.
[0229] Aspect 23: The method of any of aspects 18 through 22, wherein the first UE is a donor relay UE of the multi-hop sidelink relay; or the first UE is the remote UE.
[0230] Aspect 24: A first UE for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the first UE to perform a method of any of aspects 1 through 11.
[0231] Aspect 25: A first UE for wireless communications, comprising at least one means for performing a method of any of aspects 1 through 11.
[0232] Aspect 26: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 1 through 11.
[0233] Aspect 27: A first UE for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the first UE to perform a method of any of aspects 12 through 17.
[0234] Aspect 28: A first UE for wireless communications, comprising at least one means for performing a method of any of aspects 12 through 17.
[0235] Aspect 29: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 12 through 17.
[0236] Aspect 30: A network entity for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the network entity to perform a method of any of aspects 18 through 23.
[0237] Aspect 31: A network entity for wireless communications, comprising at least one means for performing a method of any of aspects 18 through 23.
[0238] Aspect 32: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 18 through 23.
[0239] It should be noted that the methods described herein describe possible implementations. The operations and the steps may be rearranged or otherwise modified and other implementations are possible. Further, aspects from two or more of the methods may be combined.
[0240] Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein.
[0241] Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
[0242] The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed using a general-purpose processor, a DSP, an ASIC, a CPU, a graphics processing unit (GPU) , a neural processing unit (NPU) , an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor but, in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) . Any functions or operations described herein as being capable of being performed by a processor may be performed by multiple processors that, individually or collectively, are capable of performing the described functions or operations.
[0243] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions may be stored as or transmitted using one or more instructions or code of a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
[0244] Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. Disk and disc, as used herein, include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and Blu-ray disc. Disks may reproduce data magnetically, and discs may reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media. Any functions or operations described herein as being capable of being performed by a memory may be performed by multiple memories that, individually or collectively, are capable of performing the described functions or operations.
[0245] As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. ”
[0246] As used herein, including in the claims, the article “a” before a noun is open-ended and understood to refer to “at least one” of those nouns or “one or more” of those nouns. Thus, the terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable. For example, if a claim recites “a component” that performs one or more functions, each of the individual functions may be performed by a single component or by any combination of multiple components. Thus, the term “a component” having characteristics or performing functions may refer to “at least one of one or more components” having a particular characteristic or performing a particular function. Subsequent reference to a component introduced with the article “a” using the terms “the” or “said” may refer to any or all of the one or more components. For example, a component introduced with the article “a” may be understood to mean “one or more components, ” and referring to “the component” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components. ” Similarly, subsequent reference to a component introduced as “one or more components” using the terms “the” or “said” may refer to any or all of the one or more components. For example, referring to “the one or more components” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components. ”
[0247] The term “determine” or “determining” encompasses a variety of actions and, therefore, “determining” can include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, a database, or another data structure) , ascertaining, and the like. Also, “determining” can include receiving (e.g., receiving information) , accessing (e.g., accessing data stored in memory) , and the like. Also, “determining” can include resolving, obtaining, selecting, choosing, establishing, and other such similar actions.
[0248] In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label or other subsequent reference label.
[0249] The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that may be implemented or that are within the scope of the claims. The term “example” used herein means “serving as an example, instance, or illustration” and not “preferred” or “advantageous over other examples. ” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some figures, known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.
[0250] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1.A first user equipment (UE) for wireless communication, comprising:one or more memories storing processor-executable code; andone or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the first UE to:receive, from a second UE, a first request to establish a relay connection between the first UE and the second UE, wherein the relay connection is associated with a multi-hop sidelink relay between a first network entity and a remote UE; andtransmit, to the second UE, a first response message indicating an acceptance of the first request or a rejection of the first request based at least in part on a determination of whether to accept or reject the first request, wherein the determination is based at least in part on the first UE being connected with a second network entity that is different than the first network entity.2.The first UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the first UE to:transmit, to the second network entity, a second request to establish the relay connection between the first UE and the second UE, wherein transmission of the second request is based at least in part on a determination to accept the first request.3.The first UE of claim 2, wherein the second request comprises an identifier associated with the first network entity, a measurement of a sidelink channel within the multi-hop sidelink relay, an identifier associated with a donor UE of the multi-hop sidelink relay, an identifier associated with the remote UE, an identifier associated with the second UE, a purpose for establishing the relay connection between the first UE and the second UE, or any combination thereof.4.The first UE of claim 3, wherein the one or more processors are individually or collectively further operable to execute the code to cause the first UE to:receive, from the second UE, a discovery message indicating the identifier associated with the second UE, wherein inclusion of the identifier associated with the second UE in the second request is based at least in part on receipt of the discovery message; anddetermine the identifier associated with the first network entity based at least in part on receipt of the discovery message, wherein inclusion of the identifier associated with the first network entity in the second request is based at least in part on determination of the identifier.5.The first UE of claim 3, wherein the second request comprises a radio resource control message, and wherein the radio resource control message is a measurement report message or a UE assistance information message.6.The first UE of claim 2, wherein the one or more processors are individually or collectively further operable to execute the code to cause the first UE to:receive, from the second network entity, a control signal that indicates for the first UE to report to the second network entity in response to receipt of a relay connection setup request, wherein transmission of the second request is based at least in part on receipt of the control signal.7.The first UE of claim 2, wherein the one or more processors are individually or collectively further operable to execute the code to cause the first UE to:transmit, to a third UE and based at least in part on a determination to accept the first request, a third request to establish a second relay connection between the first UE and the third UE, wherein the third UE is included in the multi-hop sidelink relay between the first network entity and the remote UE; andreceive, from the third UE and in response to the third request, a second response message that indicates an acceptance, by the third UE, to establish the second relay connection between the first UE and the third UE, wherein transmission of the second request is based at least in part on receipt of the second response message.8.The first UE of claim 7, wherein the third request and the second response message comprise sidelink radio resource control signals.9.The first UE of claim 1, wherein, to transmit the first response message, the one or more processors are individually or collectively operable to execute the code to cause the first UE to:indicate the rejection of the first request based at least in part on a determination to reject the first request, wherein the first response message comprises a reason for the rejection of the first request.10.The first UE of claim 9, wherein the reason for the rejection of the first request comprises the second network entity being different than the first network entity, the first UE being unable to switch sidelink relay connections based at least in part on a configuration received from the second network entity, a quality-of-service associated with ongoing traffic at the first UE, or any combination thereof.11.The first UE of claim 1, wherein the first UE comprises a first intermediate relay UE for the multi-hop sidelink relay, and wherein:the second UE comprises a second intermediate relay UE of the multi-hop sidelink relay; orthe second UE comprises the remote UE.12.A first user equipment (UE) for wireless communication, comprising:one or more memories storing processor-executable code; andone or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the first UE to:transmit, to a network entity, a request for configuration information for establishing a relay connection between the first UE and a second UE, wherein the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE;receive, from the network entity, a control signal comprising the configuration information based at least in part on transmitting the request; andtransmit, to the second UE via the multi-hop sidelink relay, the configuration information to establish the relay connection between the first UE and the second UE, wherein the second UE is included in the multi-hop sidelink relay based at least in part on the configuration information.13.The first UE of claim 12, wherein the request for the configuration information further comprises first information associated with the second UE, second information associated with a sidelink channel between the second UE and an adjacent relay UE within the multi-hop sidelink relay, or both.14.The first UE of claim 13, wherein:the first information comprises an identifier associated with the second UE and a position of the second UE within the multi-hop sidelink relay; andthe second information comprises an identifier associated with the sidelink channel between the second UE and the adjacent relay UE, a measurement of the sidelink channel between the second UE and the adjacent relay UE, or both.15.The first UE of claim 13, wherein the one or more processors are individually or collectively further operable to execute the code to cause the first UE to:receive, from the second UE via the multi-hop sidelink relay, a sidelink control message comprising the first information and the second information, wherein the request comprises the first information and the second information based at least in part on receiving the sidelink control message.16.The first UE of claim 12, wherein the configuration information comprises a configuration for a sidelink channel between the second UE and an adjacent UE within the multi-hop sidelink relay and a first indication to forward the configuration information to the second UE via the multi-hop sidelink relay.17.The first UE of claim 16, wherein the configuration information further comprises a second indication to forward the configuration information to each relay UE that is included in the multi-hop sidelink relay.18.A network entity, comprising:one or more memories storing processor-executable code; andone or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the network entity to:receive, from a first user equipment (UE) , a request for configuration information for establishing a relay connection between the first UE and a second UE, wherein the first UE is included in a multi-hop sidelink relay established between the network entity and a remote UE;perform an authorization procedure to determine whether to accept or reject the request; andtransmit the configuration information to establish the relay connection between the first UE and the second UE based at least in part on an acceptance of the request, wherein the second UE is included in the multi-hop sidelink relay between the network entity and the remote UE based at least in part on the configuration information.19.The network entity of claim 18, wherein the configuration information comprises a configuration for a sidelink channel between the second UE and an adjacent UE within the multi-hop sidelink relay and an indication to forward the configuration information to the second UE via the multi-hop sidelink relay.20.The network entity of claim 19, wherein the configuration information further comprises a second indication to forward the configuration information to each relay UE that is included in the multi-hop sidelink relay.21.The network entity of claim 18, wherein the request for the configuration information comprises an identifier associated with the second UE, a position of the second UE within the multi-hop sidelink relay, an identifier associated with a sidelink channel between the second UE and an adjacent relay UE within the multi-hop sidelink relay, a measurement of the sidelink channel between the second UE and the adjacent relay UE, or any combination thereof.22.The network entity of claim 21, wherein, to perform the authorization procedure, the one or more processors are individually or collectively operable to execute the code to cause the network entity to:transmit, to a core network associated with the network entity, a message indicating the identifier associated with the second UE and indicating that the second UE is an intermediate relay UE within the multi-hop sidelink relay; andreceive, from the core network, a second message indicating whether the second UE is authorized as an intermediate relay UE for the multi-hop sidelink relay, wherein transmitting the configuration information is based at least in part on the second message indicating that the second UE is authorized.23.The network entity of claim 18, wherein:the first UE is a donor relay UE of the multi-hop sidelink relay; orthe first UE is the remote UE.24.A method for wireless communications by a first user equipment (UE) , comprising:receiving, from a second UE, a first request to establish a relay connection between the first UE and the second UE, wherein the relay connection is associated with a multi-hop sidelink relay between a first network entity and a remote UE; andtransmitting, to the second UE, a first response message indicating an acceptance of the first request or a rejection of the first request based at least in part on a determination of whether to accept or reject the first request, wherein the determination is based at least in part on the first UE being connected with a second network entity that is different than the first network entity.25.The method of claim 24, further comprising:transmitting, to the second network entity, a second request to establish the relay connection between the first UE and the second UE, wherein transmission of the second request is based at least in part on a determination to accept the first request.26.The method of claim 25, wherein the second request comprises an identifier associated with the first network entity, a measurement of a sidelink channel within the multi-hop sidelink relay, an identifier associated with a donor UE of the multi-hop sidelink relay, an identifier associated with the remote UE, an identifier associated with the second UE, a purpose for establishing the relay connection between the first UE and the second UE, or any combination thereof.27.The method of claim 26, further comprising:receiving, from the second UE, a discovery message indicating the identifier associated with the second UE, wherein inclusion of the identifier associated with the second UE in the second request is based at least in part on receipt of the discovery message; anddetermining the identifier associated with the first network entity based at least in part on receipt of the discovery message, wherein inclusion of the identifier associated with the first network entity in the second request is based at least in part on determination of the identifier.28.The method of claim 26, wherein the second request comprises a radio resource control message, and wherein the radio resource control message is a measurement report message or a UE assistance information message.29.The method of claim 25, further comprising:receiving, from the second network entity, a control signal that indicates for the first UE to report to the second network entity in response to receipt of a relay connection setup request, wherein transmission of the second request is based at least in part on receipt of the control signal.30.The method of claim 25, further comprising:transmitting, to a third UE and based at least in part on a determination to accept the first request, a third request to establish a second relay connection between the first UE and the third UE, wherein the third UE is included in the multi-hop sidelink relay between the first network entity and the remote UE; andreceiving, from the third UE and in response to the third request, a second response message that indicates an acceptance, by the third UE, to establish the second relay connection between the first UE and the third UE, wherein transmission of the second request is based at least in part on receipt of the second response message.
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