WO2023199171A1

WO2023199171A1 - Sidelink carrier aggregation selection

Info

Publication number: WO2023199171A1
Application number: PCT/IB2023/053422
Authority: WO
Inventors: Joachim Löhr; Prateek Basu Mallick; Karthikeyan Ganesan; Ravi Kuchibhotla
Original assignee: Lenovo (Singapore) Pte. Ltd.
Priority date: 2022-04-11
Filing date: 2023-04-04
Publication date: 2023-10-19

Abstract

Various aspects of the present disclosure relate to a user equipment (UE) that selects one or more sidelink carriers when performing a resource selection procedure for sidelink transmissions. The UE then uses the selected one or more sidelink carriers for communicating with one or more other UEs (e.g., transmitting or receiving data, transmitting or receiving control signals). The UE selects the one or more sidelink carriers in any of a variety of manners, such as based on logical channel (LCH) restrictions configured for sidelink LCHs, or based on some predetermined criteria such as a channel busy ratio (CBR) threshold or a reference signal received power (RSRP) value.

Description

SIDELINK CARRIER AGGREGATION SELECTION

RELATED APPLICATION

[0001] This application claims priority to U.S. Patent Application Serial No. 63/329,737 filed April 11, 2022 entitled “Sidelink Carrier Aggregation Selection,” the disclosure of which is incorporated by reference herein in its entirety.

TECHNICAL FIELD

[0002] The present disclosure relates to wireless communications, and more specifically to selecting one or more carriers for communicating with another device.

BACKGROUND

[0003] A wireless communications system may include one or multiple network communication devices, such as base stations, which may be otherwise known as an eNodeB (eNB), a next-generation NodeB (gNB), or other suitable terminology. Each network communication device, such as a base station, may support wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE), or other suitable terminology. The wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system, such as time resources (e.g., symbols, slots, subslots, mini-slots, aggregated slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers). Additionally, the wireless communications system may support wireless communications across various radio access technologies (RATs) including third generation (3G) RAT, fourth generation (4G) RAT, fifth generation (5G) RAT, and other suitable RATs beyond 5G. In some cases, a wireless communications system may be a non-terrestrial network (NTN), which may support various communication devices for wireless communications in the NTN. For example, an NTN may include network entities onboard non-terrestrial vehicles such as satellites, unmanned aerial vehicles (UAV), and high-altitude platforms systems (HAPS), as well as network entities on the ground, such as gateway entities capable of transmitting and receiving over long distances. [0004] In some instances, two devices in a wireless communication system, such as two UEs, communicate with one another directly rather than through the base station. A direct communication link between two such devices is also referred to as a sidelink (SL).

SUMMARY

[0005] The present disclosure relates to methods, apparatuses, and systems that support sidelink carrier aggregation selection. A UE selects one or more sidelink carriers when performing a resource selection procedure for sidelink transmissions. The UE then uses the selected one or more sidelink carriers for communicating with one or more other UEs (e.g., transmitting or receiving data, transmitting or receiving control signals). The UE selects the one or more sidelink carriers in any of a variety of manners, such as based on logical channel (LCH) restrictions configured for sidelink LCHs, or based on some predetermined criteria such as a channel busy ratio (CBR) threshold or a reference signal received power (RSRP) value. By utilizing the described techniques, resource (sidelink carrier) selection in situations in which the UE is configured with multiple sidelink carriers is performed in an efficient manner, such as by taking into account the channel conditions or congestion levels of a sidelink carrier as well as mapping restrictions configured for a sidelink LCH.

[0006] Some implementations of the method and apparatuses described herein may include wireless communication at a device (e.g., a UE), and the device selects, based at least in part on a sidelink logical channel prioritization (LCP) procedure or a carrier criteria, a set of sidelink carriers from a plurality of sidelink carriers the apparatus is configured with; selects, based on one or more criteria, one or more sidelink carriers from the set of sidelink carriers; and transmit, to one or more UEs, data using the one or more sidelink carriers.

[0007] In some implementations of the method and apparatuses described herein, the device selects the set of sidelink carriers by: determining one or more sidelink logical channels (LCHs) as a result of the sidelink LCP procedure; and selects the set of sidelink carriers based at least in part on logical channel restrictions configured for the determined one or more sidelink LCHs. Additionally or alternatively, the device selects, as the set of sidelink carriers, sidelink carriers of the plurality of sidelink carriers that satisfy the logical channel restrictions associated with the one or more sidelink LCHs. Additionally or alternatively, the carrier criteria comprises a channel busy ratio (CBR) or a reference signal received power (RSRP), and the device selects the set of sidelink carriers based at least in part on the CBR or the RSRP; and selects the one or more sidelink carriers from the set of sidelink carriers by determining carriers of the set of sidelink carriers that satisfy logical channel restrictions associated with one or more sidelink logical channels. Additionally or alternatively, the device selects the one or more sidelink carriers by performing a resource selection procedure across all of the sidelink carriers in the set of sidelink carriers. Additionally or alternatively, the device selects the one or more sidelink carriers based on a predefined priority order of the sidelink carriers in the set of sidelink carriers. Additionally or alternatively, the device transmits, to a UE of the one or more UEs on a first carrier of the one or more sidelink carriers, a first signaling indicating a request for channel state information (CSI); and receives, from the UE on a second carrier of the one or more sidelink carriers, a second signaling indicating the CSI, wherein the first carrier and the second carrier are different carriers. Additionally or alternatively, the device transmits, to a UE of the one or more UEs, a first signaling indicating a request for CSI; and receives, from the UE on a predefined resource pool or sidelink carrier of the one or more sidelink carriers, a second signaling indicating the CSI. Additionally or alternatively, the first signaling indicates a request for CSI for particular ones of the one or more sidelink carriers, and the second signaling comprises a sidelink CSI medium access control (MAC) control element (CE) including CSI information for each of the particular ones of the one or more sidelink carriers. Additionally or alternatively, the device transmits, to the one or more UEs, a first signaling indicating sidelink control information including that a sidelink transport block (TB) is duplicated; transmits, to the one or more UEs after transmitting the first signaling, first data including the sidelink TB; and transmits, to the one or more UEs after transmitting the data including the sidelink TB, second data including a duplicate of the sidelink TB. Additionally or alternatively, the device transmits the second data a predefined processing time after transmitting the first data. Additionally or alternatively, the device receives, from a base station, a set of configured grant resources for duplicating the sidelink TB; and include, in the sidelink control information, a bit indicating that a duplicate sidelink TB is transmitted on the set of configured grant resources. Additionally or alternatively, the device activates duplication of the sidelink TB in response to a set of rules or criteria indicating to activate duplication of the sidelink TB. Additionally or alternatively, the device, in response to the duplicate of the sidelink TB including a packet data convergence protocol (PDCP) service data unit (SDU) of a logical channel, transmits the duplicate of the sidelink TB without multiplexing data of other logical channels with the duplicate of the sidelink TB. Additionally or alternatively, the device configures, for a device pair including the apparatus and a UE of the one or more UEs, a discontinuous reception (DRX) configuration for one sidelink carrier of the one or more sidelink carriers; and applies, for the device pair, the DRX configuration for each of the one or more sidelink carriers other than the one sidelink carrier. Additionally or alternatively, the device applies, for a groupcast communication across a subset of the one or more sidelink carriers, a preconfigured DRX configuration per PC5 quality of service identifier or destination identifier.

[0008] Some implementations of the method and apparatuses described herein may include wireless communication at a device (e.g., a UE), and the device receives, from a UE, data using one or more sidelink carriers selected by the UE; receives, from the UE on a first carrier of the one or more sidelink carriers, a first signaling indicating a request for CSI; and transmits, to the UE on a second carrier of the one or more sidelink carriers, a second signaling indicating the CSI, wherein the first carrier and the second carrier are different carriers.

[0009] In some implementations of the method and apparatuses described herein, the device transmits, to the UE, the second signaling on a predefined resource pool or sidelink carrier of the one or more sidelink carriers. Additionally or alternatively, the first signaling indicates a request for CSI for particular ones of the one or more sidelink carriers, and the second signaling comprises a sidelink CSI MAC CE including CSI information for each of the particular ones of the one or more sidelink carriers. Additionally or alternatively, the device receives, from the UE, a third signaling indicating sidelink control information including that a sidelink TB is duplicated; receives, from the UE after receiving the third signaling, first data including the sidelink TB; and receives, from the UE after receiving the data including the sidelink TB, second data including a duplicate of the sidelink TB. Additionally or alternatively, the sidelink control information includes a bit indicating that the duplicate of the sidelink TB is transmitted on a set of configured grant resources. Additionally or alternatively, the device configures, for a device pair including the apparatus and the UE, a DRX configuration for one sidelink carrier of the one or more sidelink carriers; and applies, for the device pair, the DRX configuration for each of the one or more sidelink carriers other than the one sidelink carrier. Additionally or alternatively, the device applies, for a groupcast communication across a subset of the one or more sidelink carriers, a preconfigured DRX configuration per PC5 quality of service identifier or destination identifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Various aspects of the present disclosure for sidelink carrier aggregation selection are described with reference to the following Figures. The same numbers may be used throughout to reference like features and components shown in the Figures.

[0011] FIG. 1 illustrates an example of a wireless communications system that supports sidelink carrier aggregation selection in accordance with aspects of the present disclosure.

[0012] FIG. 2 illustrates an example of aggregation of sidelink carriers in accordance with aspects of the present disclosure.

[0013] FIG. 3 illustrates an example block diagram of components of a device (e.g., a UE) that supports sidelink carrier aggregation selection in accordance with aspects of the present disclosure.

[0014] FIG. 4 illustrates an example block diagram of components of a device (e.g., a network entity that supports sidelink carrier aggregation selection in accordance with aspects of the present disclosure.

[0015] FIGs. 5 through 10 illustrate flowcharts of methods that support sidelink carrier aggregation selection in accordance with aspects of the present disclosure.

DETAILED DESCRIPTION

[0016] Implementations of sidelink carrier aggregation selection are described, such as related to a UE that selects one or more sidelink carriers when performing a resource selection procedure for sidelink transmissions. The UE uses the selected one or more sidelink carriers for communicating with one or more other UEs (e.g., transmitting or receiving data, transmitting or receiving control signals). The UE selects the one or more sidelink carriers in any of a variety of manners.

[0017] A UE may select one or both of time resources (e.g., symbols, slots, subslots, mini-slots, aggregated slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) to support sidelink communication with another UE. For example, the UE may perform a resource selection procedure, in which the UE may select a set of sidelink carriers (e.g., one or more sidelink carriers) for sidelink communication (e.g., sidelink transmission, sidelink reception, or both). In some cases, the UE may select the set of sidelink carriers based on one or more sidelink LCH restrictions (e.g., restrictions configured for an LCH that is configured for sidelink communication (a sidelink LCH)). A sidelink LCH, which can be mapped to a transport channel, may carry various types of information (e.g., control information) and is defined by what type of information is transferred on the sidelink LCH. The UE may perform at least part of a logical channel prioritization (LCP) procedure before selecting the set of sidelink carriers. The LCP procedure, for example, prioritizes sidelink LCHs for sidelink communication, as discussed in the 3^rd generation partnership project (3GPP) Technical Specification (TS) 38.321, e.g., at section 5.22.1.4.1. Based on the LCP procedure, the UE may identity one or more sidelink LCHs associated with the sidelink communication for multiplexing with a sidelink TB. As such, the UE may select the set of sidelink carriers satisfying the one or more sidelink LCH restrictions configured for the sidelink LCHs which are multiplexed in the sidelink TB. The UE then further performs the resource selection on the determined set of sidelink carriers or serving cells.

[0018] Additionally or alternatively, as part of a resource selection procedure, a UE may select a set of sidelink carriers or a set of serving cells based on a criterion or a criteria, for example, a CBR threshold value or an RSRP threshold value, or both. By way of example, a UE may select a sidelink carrier or a cell as a candidate sidelink carrier based on a CBR associated with the cell satisfying a threshold (e.g., being below a threshold). As part of the resource selection procedure, the UE may also determine the sidelink LCHs which satisfy the sidelink LCH restrictions associated with the sidelink LCHs (e.g., configured for the sidelink LCHs). For example, the UE may determine that the sidelink LCH are mappable to the sidelink carrier or the cell. As a result, the UE may perform a sidelink LCP procedure for the sidelink LCH and perform a resource selection procedure accordingly.

[0019] By utilizing the described techniques, resource (sidelink carrier) selection in situations in which the UE is configured with multiple sidelink carriers is performed in an efficient manner, such as by taking into account the channel conditions or congestion levels of a sidelink carrier as well as mapping restrictions configured for a sidelink LCH.

[0020] Furthermore, using all of the configured and activated sidelink carriers for sidelink transmission may not be efficient in all scenarios, e.g., considering the radio channel conditions or the congestion level on a particular sidelink carrier as well as taking into account the quality of service (QoS) requirements of the sidelink TB. The techniques discussed herein provide, for cases when the UE is configured with multiple sidelink carriers, an efficient resource selection procedure that satisfies QoS requirements associated with the sidelink LCHs multiplexed in a sidelink TB as well as provides a high throughput and system capacity.

[0021] Additionally, by using only a subset of carriers, the transmission power is reduced and the probability that a transmission is going to be successful is increased because the sidelink carriers are chosen appropriately (e.g., based on CBR, RSRP, or the logical channel restrictions).

[0022] Furthermore, by utilizing the described techniques there are multiple benefits when the UE uses only the carriers which are not congested for resource selection. For example, the probability that HARQ retransmission is needed is reduced, which in turn reduces the latency; or less interference with other sidelink UEs or transmissions is created. Overall, when considering congestion for resource selection or carrier selection, there should be an increase of the system capacity.

[0023] The techniques discussed herein thus allow for sidelink carrier aggregation in situations in which a UE may not need all of the configure sidelink carriers for a sidelink transmission, but only a subset thereof. For example, sidelink carrier aggregation may be performed without transmitting on sidelink carriers which are congested or cannot support the required or desired QoS efficiently. The UE is able to decide autonomously which one or more sidelink carriers to use.

[0024] Aspects of the present disclosure are described in the context of a wireless communications system. Aspects of the present disclosure are further illustrated and described with reference to device diagrams and flowcharts that relate to sidelink carrier aggregation selection.

[0025] FIG. 1 illustrates an example of a wireless communications system 100 that supports sidelink carrier aggregation selection in accordance with aspects of the present disclosure. The wireless communications system 100 may include one or more base stations 102, one or more UEs 104, and a core network 106. The wireless communications system 100 may support various radio access technologies. In some implementations, the wireless communications system 100 may be a 4G network, such as an LTE network or an LTE-Advanced (LTE-A) network. In some other implementations, the wireless communications system 100 may be a 5G network, such as a new radio (NR) network. In other implementations, the wireless communications system 100 may be a combination of a 4G network and a 5G network. The wireless communications system 100 may support radio access technologies beyond 5G. Additionally, the wireless communications system 100 may support technologies, such as time division multiple access (TDMA), frequency division multiple access (FDMA), or code division multiple access (CDMA), etc.

[0026] The one or more base stations 102 may be dispersed throughout a geographic region to form the wireless communications system 100. One or more of the base stations 102 described herein may be, or include, or may be referred to as a base transceiver station, an access point, a NodeB, an eNodeB (eNB), a next-generation NodeB (gNB), a Radio Head (RH), a relay node, an integrated access and backhaul (IAB) node, or other suitable terminology. A base station 102 and a UE 104 may communicate via a communication link 108, which may be a wireless or wired connection. For example, a base station 102 and a UE 104 may perform wireless communication over a NR-Uu interface.

[0027] A base station 102 may provide a geographic coverage area 110 for which the base station 102 may support services (e.g., voice, video, packet data, messaging, broadcast, etc.) for one or more UEs 104 within the geographic coverage area. For example, a base station 102 and a UE 104 may support wireless communication of signals related to services (e.g., voice, video, packet data, messaging, broadcast, etc.) according to one or multiple radio access technologies. In some implementations, a base station 102 may be moveable, such as when implemented as a gNB onboard a satellite or other non-terrestrial station (NTS) associated with a non-terrestrial network (NTN). In some implementations, different geographic coverage areas 110 associated with the same or different radio access technologies may overlap, and different geographic coverage areas 110 may be associated with different base stations 102. 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.

[0028] The one or more UEs 104 may be dispersed throughout a geographic region or coverage area 110 of the wireless communications system 100. A UE 104 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, a customer premise equipment (CPE), a subscriber device, or as some other suitable terminology. In some implementations, the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples. Additionally, or alternatively, a UE 104 may be referred to as an Internet-of-Things (loT) device, an Internet-of-Everything (loE) device, or as a machine-type communication (MTC) device, among other examples. In some implementations, a UE 104 may be stationary in the wireless communications system 100. In other implementations, a UE 104 may be mobile in the wireless communications system 100, such as an earth station in motion (ESIM).

[0029] The one or more UEs 104 may be devices in different forms or having different capabilities. Some examples of UEs 104 are illustrated in FIG. 1. A UE 104 may be capable of communicating with various types of devices, such as the base stations 102, other UEs 104, or network equipment (e.g., the core network 106, a relay device, a gateway device, an integrated access and backhaul (IAB) node, a location server that implements the location management function (LMF), or other network equipment). Additionally, or alternatively, a UE 104 may support communication with other base stations 102 or UEs 104, which may act as relays in the wireless communications system 100.

[0030] A UE 104 may also support wireless communication directly with other UEs 104 over a communication link 112. For example, a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link. In some implementations, such as vehicle-to-vehicle (V2V) deployments, vehicle-to-everything (V2X) deployments, or cellular- V2X deployments, the communication link 112 may be referred to as a sidelink. For example, a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.

[0031] A base station 102 may support communications with the core network 106, or with another base station 102, or both. For example, a base station 102 may interface with the core network 106 through one or more backhaul links 114 (e.g., via an SI, N2, or other network interface). The base stations 102 may communicate with each other over the backhaul links 114 (e.g., via an X2, Xn, or another network interface). In some implementations, the base stations 102 may communicate with each other directly (e.g., between the base stations 102). In some other implementations, the base stations 102 may communicate with each other indirectly (e.g., via the core network 106). In some implementations, one or more base stations 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC). The ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as remote radio heads, smart radio heads, gateways, transmissionreception points (TRPs), and other network nodes and/or entities. [0032] The core network 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions. The core network 106 may be an evolved packet core (EPC), or a 5G core (5GC), which may include a control plane entity that manages access and mobility (e.g., a mobility management entity (MME), an access and mobility management functions (AMF)), and a 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)). In some implementations, the control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for the one or more UEs 104 served by the one or more base stations 102 associated with the core network 106.

[0033] According to implementations, one or more of the UEs 104 are operable to implement various aspects of sidelink carrier aggregation selection, as described herein. For instance, a UE 116 can communicate with a UE 118 over a communication link 112 referred to as a sidelink. The UE 116 performs a sidelink selection process 120 to select one or more sidelink carriers to use to communicate with the UE 118. These UEs 116 and 118 are examples of a UE 104.

[0034] In aspects of this disclosure, the development of NR sidelink is taken into consideration. NR sidelink communication may be used with V2X applications as well as other (e.g., commercial) use cases. For some sidelink applications, two key requirements have been identified: increased sidelink data rate and support of new carrier frequencies for sidelink. Increased sidelink data rate is motivated, for example, by applications such as sensor information (e.g., video) sharing between vehicles with high degree of driving automation. Commercial use cases could require data rates in excess of what is possible in Release 17. Increased data rate can be achieved with the support of sidelink carrier aggregation and sidelink over unlicensed spectrum. Furthermore, by enhancing the frequency range 2 (FR2) sidelink operation, increased data rate can be more efficiently supported on FR2. While the support of new carrier frequencies and larger bandwidths would also allow to improve its data rate, the main benefit would come from making sidelink more applicable for a wider range of applications. More specifically, with the support of unlicensed spectrum and the enhancement in FR2, sidelink will be in a better position to be implemented in commercial devices since utilization of the intelligent transportation system (ITS) band is limited to ITS safety related applications.

[0035] In aspects of this disclosure, supporting only LTE sidelink carrier aggregation (CA) features for NR (i.e., sidelink carrier (re-)selection, synchronization of aggregated carriers, handling the limited capability, power control for simultaneous sidelink transmit (TX or Tx), packet duplication) is taken into consideration.

[0036] In aspects of this disclosure, limiting sidelink to frequency range 1 (FR1) licensed spectrum and ITS band in FR1 is taken into consideration.

[0037] In aspects of this disclosure, the techniques discussed herein being backwards compatible in the following regards is taken into consideration. A Release 16 or Release 17 UE can receive Release 18 sidelink broadcast/groupcast transmissions with CA for the carrier on which it receives physical sidelink control channel (PSCCH) or physical sidelink shared channel (PSSCH) and transmits the corresponding sidelink hybrid automatic repeat request (HARQ) feedback (when SL- HARQ is enabled in sidelink control information (SCI)).

[0038] Carrier aggregation is a solution for achieving higher data rate for sidelink application such as sensor information (e.g., video) sharing between vehicles with high degree of driving automation. Carrier aggregation is a technique where multiple frequency portions (component carriers) are assigned to the same user. The maximum possible data rate per user is increased by increasing the number of component carriers towards the user. The system data rate of a cell increases as well because of a better resource utilization.

[0039] References to carriers and cells are included herein. When referring to sidelink or a sidelink communication link herein, the terms carrier (or sidelink carrier) and cell (or sidelink cell or serving cell) are used interchangeably. These carriers or cells may also be referred to herein as resources.

[0040] References to selection of carriers, cells, or resources herein may refer to an initial selection of at least one carrier, cell, or resource, as well as to a subsequent reselection of at least one carrier, cell, or resource.

[0041] FIG. 2 illustrates an example 200 of aggregation of sidelink carriers in accordance with aspects of the present disclosure. The example 200 illustrates the aggregation of three carriers fl , f2, and f3 with different carrier bandwidths.

[0042] Returning to FIG. 1, it should be noted that sidelink carrier aggregation may not be efficient in all scenarios, e.g., where the data rate demand is low or when the UE 104 capability does not allow use of sidelink carrier aggregation or when the deployment and/or authorization does not allow sidelink carrier aggregation to be used. Additionally, unlike the Uu interface where the network knows the UE’s capability, in sidelink operation UEs 104 may not know each other’s aggregation capabilities especially for groupcast and broadcast based sidelink communication. Even for unicast sidelink communication, the capabilities may only be shared when a PC5 radio resource control (RRC) connection has been established between the peer UEs. In aspects of this disclosure, techniques for determining when and how sidelink carrier aggregation will be configured and used are described.

[0043] One solution for determining when and how sidelink carrier aggregation will be configured and used is to have the overlaying network configure carrier aggregation to member UEs. However, this would need a lot of reporting (e.g., about unicast peer, group members, data rate/service/QoS, and so forth) from the sidelink UEs to the serving network node (e.g., base station 102). This may not be possible in some situations or would at least be very complex, if the unicast peer, group members are not served by the same network node.

[0044] As another solution for determining when and how sidelink carrier aggregation will be configured and used, a UE 116 may consider all the configured sidelink carriers (e.g., all activated sidelink carriers) for a sidelink transmission. For example, resource selection is done on all activated sidelink carriers. However, this solution might come at the expense of an increased complexity since the UE 116 is performing resource selection on each active sidelink carrier, as well as may lead to situations where the QoS requirements of a sidelink TB may be not satisfied (e.g., due to the channel conditions or congestion level on a particular sidelink carrier). Various implementations are discussed herein that do not have these shortcomings.

[0045] The discussions herein apply to all cast types (unicast, groupcast and broadcast) unless indicated otherwise.

[0046] In one or more implementations, the UE 104 selects a set of carriers or serving cells when performing a resource selection procedure for sidelink transmissions. The sidelink UE 104 which is configured with multiple sidelink carriers, e.g., the UE 104 is configured with multiple sidelink carriers which are active for sidelink transmission, determines a set of sidelink carrier or sidelink serving cells based on sidelink LCH restrictions configured for sidelink LCHs. In one example the Tx UE 104 performs at least part of the LCP procedure before selecting the set of sidelink carriers which UE 104 considers for resource selection. As a result of the at least in part executed LCP procedure, the UE 104 is aware of the sidelink LCHs multiplexed in a sidelink TB. In one example the UE 104 considers the sidelink LCH restrictions configured for the sidelink LCHs which are multiplexed in the sidelink TB in order to determine the set of candidate carriers or serving cells used for the resource selection. Such sidelink LCH restrictions may be in one example a set of allowed numerologies, subcarrier spacing (SCS), and/or a set of serving cells/carriers the sidelink LCH is allowed to be mapped on. The UE 104 selects the set of sidelink carriers satisfying the sidelink LCH restrictions or QoS requirements configured for the sidelink LCHs which are according to the at least partly executed LCP procedure multiplexed in the sidelink TB. The Tx UE 104 will then further perform the resource (re)selection on the determined set of sidelink carrier/serving cells.

[0047] Additionally or alternatively, the UE 104 selects a set of sidelink carriers or serving cells when performing resource selection procedure for sidelink transmission by considering QoS attributes associated with the sidelink LCHs which are multiplexed in a sidelink TB. In one example the UE 104 considers whether sidelink LCHs multiplexed in a sidelink TB have an associated minimum communication range (MCR) value. MCR is a QoS parameter introduced for 5G V2X which denotes that the QoS attributes like ultra-low latency and very high reliability requirement are to be fulfilled within a given MCR. Sidelink TBs having an associated MCR may be in one example mapped to specific predefined sidelink carriers. In order to ensure that the QoS requirements of the sidelink TBs are satisfied within the configured MCR, the UE 104 shall only transmit the sidelink TB on specific predefined or preconfigured sidelink carriers.

[0048] Additionally or alternatively, the UE 104 selects as a first step of the resource selection procedure a set of sidelink carrier or serving cells based on some predetermined criteria. Such criteria might be for example a CBR threshold based on which the UE 104 determines whether a sidelink carrier or cell is selected for the resource selection. In one example the UE 104 selects a sidelink carrier or cell as a candidate sidelink carrier for resource selection if the CBR for that cell is below a predefined threshold. It should be noted that the CBR value reflects the congestion level or load on a sidelink carrier or cell. As a second step the UE 104 selects the sidelink LCHs which satisfy the sidelink LCH restrictions configured for the sidelink LCHs, e.g. , the UE 104 selects the set of sidelink LCHs which are allowed to be mapped to the selected set of sidelink carrier or cells. As a next step the UE 104 performs the sidelink LCP procedure among the selected set of sidelink LCHs and performs the resource selection procedure accordingly for the determined sidelink TB, e.g., as a result of the at least partly executed sidelink LCP procedure. [0049] Additionally or alternatively, the UE 104 selects a sidelink carrier or cell as a candidate sidelink carrier for resource selection for cases when the RSRP measured for that carrier or cell is exceeding a predefined threshold. Such threshold may be preconfigured or fixed in the specification or configured by the network. The RSRP measurement may be defined as a measurement of a (sidelink) pathloss reference, where such pathloss reference may be predefined or preconfigured.

[0050] It should be noted that the UE 104 may perform resource selection using any combination of the implementations discussed above or any the combination of the different steps described in the implementations discussed above.

[0051] In one or more implementations, the UE 104 performs resource selection on a determined set of candidate sidelink carriers or cells. For example, the UE 104 performs a resource selection for each of the sidelink carriers in the determined set of sidelink carriers or cells and accordingly identifies candidate resources for each of the sidelink carriers or cells. Subsequently the UE 104 determines a candidate resource set which is the union of the candidate resources for all the sidelink carriers or cells. The MAC layer of the UE 104 selects, for example, from this provided candidate resource set, e.g., including candidate resources on all the sidelink carriers, sidelink resources as in the legacy, e.g., considering latency requirements, and so forth.

[0052] Additionally or alternatively, the UE 104 performs resource selection on the determined set of sidelink carriers or cells in a predefined (e.g., priority) order. The UE 104 identifies, for example, sidelink candidate resources first on the highest priority sidelink carrier among the set of candidate sidelink carriers or cells. In case the sidelink candidate resources are not sufficient or don’t satisfy the requirements of the to be transmitted sidelink data, e.g., latency requirements (packet delay budget (PDB)) cannot be fulfilled, the UE 104 considers additionally the next highest priority sidelink carrier and identifies on the next highest priority sidelink carrier further sidelink resource candidates. Additionally or alternatively, each sidelink carrier is associated with a priority. In one example the priority is configured (such as preconfigured), e.g., as part of the carrier configuration (broadcast in system information of the carrier).

[0053] In one or more implementations, a sidelink UE 104 reports a triggered CSI report on a sidelink carrier which is different to the carrier where the CSI report was triggered. According to one implementation of the embodiment, a UE 104 may transmit a CSI MAC CE on a sidelink carrier which is different than the sidelink carrier on which the SCI triggering the CSI reporting was received. Allowing such flexibility for the reporting of the CSI information ensures that latency requirements may be satisfied, e.g., CSI MAC CE is transmitted on a different sidelink carrier before the sl-CSI- ReportTimer expires. In order to ensure that a UE 104 receiving a CSI MAC CE can unambiguously associate the received CSI report to the sidelink carrier for which the CSI information has been computed or reported, in one or more implementations the CSI MAC CE contains a field which indicates the identity of the sidelink carrier for which the CSI information has been computed or reported, e.g., for which the MAC CE applies. In one example the CSI MAC CE is comprised of a bitmap, where each entry of the bitmap corresponds to a sidelink carrier or serving cell of the MAC entity or UE 104. If there is a sidelink carrier or serving cell configured for the MAC entity with SLcarrierlndex i and if CSI information has been included for that sidelink carrier, the field is set to 1, otherwise the field is set to 0.

[0054] In one or more implementations, a sidelink CSI MAC CE contains CSI information for multiple sidelink carriers and/or resource pools. In one example the sidelink CSI MAC CE contains CSI information for each of the configured sidelink carriers for which CSI reporting was triggered, e.g. CSI request contains information indicating for which sidelink carrier a CSI should be reported. The MAC CE carrying the CSI information may be comprised of a bitmap, where each field of the bitmap, e.g., Ci, refers to a sidelink carrier or serving cell. Ci indicates the presence of a CSI report for the sidelink carrier with SLCarrierlndex i. The Ci field set to 1, for example, indicates that a CSI field carrying the CSI information for the sidelink carrier with SLCarrierlndex i is reported. The Ci field set to 0, for example, indicates that a CSI field for the sidelink carrier with SLCarrierlndex i is not reported. Additionally or alternatively, the sidelink CSI MAC CE is comprised of a field indicating the identity of the sidelink carrier for which the CSI information is reported and corresponding CSI information field for each sidelink carrier for which CSI reporting was triggered and is not cancelled.

[0055] In one or more implementations, a resource pool and/or a sidelink carrier is predefined or configured on which CSI MAC CE(s) are to be transmitted. For example, the UE 104 maps a generated CSI MAC CE on the predefined sidelink carrier or resource pool. For mode 2, the UE 104 selects resources on the predefined sidelink carrier or resource pool for the transmission of a TB which includes a CSI MAC CE. In one example a resource pool or sidelink carrier is predefined or configured for the transmission of sidelink control information such as sidelink MAC CEs. In another example a mapping between a sidelink MAC CE and a sidelink carrier or resource pool is introduced.

[0056] In one or more implementations, the UE 104 processes sidelink grants in a predefined order for cases when the UE 104 has multiple sidelink grants on different sidelink carriers or cells which are overlapping in time. According to one implementation of the embodiment a sidelink transmit (Tx) UE 104 configured with multiple sidelink carriers or serving cells may receive multiple sidelink grants from the base station 102 for different sidelink carriers which are overlapping in time, e.g., sidelink grant allocating sidelink resources on different sidelink carriers in overlapping slots. In one example the UE 104 processes the multiple sidelink grant in a specific order. According to one implementation the order in which sidelink grants are processed is determined by the UE 104 based on the priority associated with a sidelink carrier or cell. Since the processing order will have an impact on where high priority sidelink data is mapped to, e.g., on which sidelink carrier high priority sidelink data is transmitted on, it is crucial to define the processing order such that high priority sidelink data ends up on a high priority sidelink carrier or cell. It should be noted that the first of the multiple overlapping sidelink grants will contain the highest priority sidelink data according to the current specific LCP procedure. According to one implementation of this embodiment a sidelink carrier or cell is configured with a priority. Additionally or alternatively, the UE 104 is configured with a priority order for the sidelink carrier/cells it is configured with. In one example the priority order is configured by the network.

[0057] In one or more implementations, the SCI includes a field which indicates whether the sidelink TB carried in the associated PSSCH is duplicated. For example, the field in the SCI indicates whether duplication is activated, e.g., per packet duplication. In one example the corresponding recipient UE(s) 104 (receive (RX or Rx) UE) upon receiving a SCI indicating that a sidelink MAC protocol data unit (PDU) (TB) is duplicated starts to monitor on a set of predefined sidelink carrier(s) or cell(s) respectively on a predefined set of configured grant resources for the duplicate transmissions. According to one implementation, based on the destination ID signaled within the SCI the RX UE 104 determines on which sidelink carrier(s) or cells(s) the duplicate transmission takes place. In one example there is some mapping between a destination identity and the set of (secondary) sidelink carriers or cells configured indicating on which sidelink carrier the duplicates are transmitted on. According to one specific implementation the mapping between destination ID and set of sidelink carriers is configured or signaled within the unicast link setup procedure, e.g., the Tx UE 104 signals the set of sidelink carrier(s) for a destination ID to the Rx UE 104. According to a further aspect, the Tx UE 104 signals a primary sidelink carrier and potentially a set of secondary sidelink carrier(s) associated with a destination to the Rx UE 104. Primary carrier denotes the sidelink carrier where a sidelink TB for a destination is transmitted when duplication is deactivated whereas the secondary sidelink carriers are referring to the sidelink carriers which are used for the duplicate transmissions.

[0058] In one or more implementations, a duplicate transmission is to occur at least a certain predefined time after the transmission of the original sidelink TB. This time offset is defined such that the Rx UE 104 has sufficient time to activate another sidelink carrier (which may not be used currently) upon reception of a SCI indicating duplicate transmission on other sidelink carrier and to monitor for duplicate transmissions. The time offset is in one example at least comprised of the processing time for reception and decoding a SCI and the time to activate a sidelink carrier and start monitoring for PSCCH/PSSCH.

[0059] In one or more implementations, a Tx UE 104 is configured with a set of criteria or rules defining when to use duplication for a sidelink transmission. In one example the Tx UE 104 uses duplication for destination(s) or sidelink service(s) having an associated PC5 QoS Identifier (PQI) exceeding a certain threshold. Since the PQI reflects the QoS requirements of a sidelink LCH or sidelink service, the PQI based rule or criteria ensures that duplication is applied for high reliability services. In another example the Tx UE 104 may apply duplication for a sidelink transmission in case it has received a predefined number of NACKs previously for the transmission to the same destination or transmission of data of the same sidelink LCH. In another example a sidelink LCH configuration may contain a field or configuration indicating duplication shall be applied for cases when a certain predefined number of NACKs have been received previously for transmission of data of this sidelink LCH.

[0060] In one or more implementations, packet duplication may be sidelink destination specific. For example, packet data convergence protocol (PDCP) duplication may be applied for all sidelink transmissions to a specific destination if packet duplication is enabled.

[0061] In one or more implementations, the TX UE 104 refrains from multiplexing data of other sidelink LCHs and/or MAC CE(s) in a sidelink TB in case the sidelink TB contains a PDCP service data unit (SDU) or protocol data unit (PDU) of a sidelink resource block (RB) for which duplication is applied. According to one implementation of this embodiment a new sidelink LCH restriction is introduced which ensures that data of sidelink LCHs for which duplication is applied is not multiplexed with data of any other sidelink LCHs and optionally MAC CE(s), e.g., the sidelink TB only contains the PDCP PDU(s) of the sidelink LCH or RB for which duplication is applied or activated.

[0062] In one or more implementations, a common ActiveTime across multiple sidelink carriers is applied for sidelink discontinuous reception (DRX) operation in a CA scenario. In one implementation, a common ActiveTime across multiple sidelink carriers is defined for a unicast PC5 connection. In one example a DRX configuration is configured for a pair of Tx and Rx UE during the unicast link establishment procedure for one sidelink carrier, e.g. RRCReconfigurationSidelink message includes the DRX configuration for the PC5 connection, and further applied for other sidelink carrier which may be additionally configured and activated for the same PC5 connection, e.g., DRX configuration is also applied for other sidelink carrier. The term “common ActiveTime” refers to the UE behavior where a Rx and respectively a Tx UE considers itself to be in ActiveTime on all configured and activated sidelink carrier when the UE goes to ActiveTime on one sidelink carrier, e.g., caused by starting of a DRX related timer for one sidelink carrier/cell. It should be noted that sidelink DRX related timers may be still maintained per carrier or per HARQ process. For example, if the SL-Drx-inactivity timer is started on one sidelink carrier due to the reception of a SCI on that carrier, the UE goes to ActiveTime on all other configured and activated sidelink carriers.

[0063] The derivation of a DRX configuration for the primary carrier is based on the QoS (PQI or QoS flow identifiers (QFIs)), L2 Identity for any destination as well as based on PC5 RRC negotiation for a Unicast destination. DRX configuration for secondary carrier(s) may be configured (e.g., by the base station 102 or a sidelink transmitter UE 104 to its peer UE(s)) same as that of primary carrier, or only a start offset may be signaled implicitly keeping the rest of the parameters (like on- duration timer, inactivity timer) the same as for the primary.

[0064] In one or more implementations, a common ActiveTime is applied across a set of sidelink carrier for a pair of Source and destination Layer-2 ID. The set of sidelink carrier may be a subset of the multiple sidelink carrier a UE is configured with. According to one implementation of the embodiment, the common ActiveTime across a set of sidelink carrier is applied for a groupcast service, e.g., the destination is associated with a groupcast service. It should be noted that for groupcast there is a preconfigured DRX configuration per PQI or destination ID. According to one implementation, a mapping between a PQI or destination and a set of sidelink carrier is configured for groupcast. The PQI or service or destination ID to carrier mapping also defines, in one example, the DRX pattern or configuration per sidelink carrier.

[0065] Various aspects of UE behavior for resource selection for sidelink carrier aggregation are discussed herein. These aspects include resource selection based on an LCP procedure and selected sidelink LCHs, the UE selects the set of available sidelink carriers considering the sidelink LCH restrictions configured for the selected sidelink LCHs. These aspects also include the UE selects a first the set of candidate carriers based on CBR or RSRP, and then in a second step the UE uses the carriers and associated numerologies and other sidelink LCH restrictions (allowedservingcell) as input to the LCP procedure. These aspects also include the UE uses all the candidate resources across the set of sidelink carriers as possible resource candidates and performs the resource selection as in legacy. These aspects also include priority order for sidelink carriers or serving cells (also for mode 1 when the UE has multiple sidelink grants in one slot on different carriers in which order the UE should treat the sidelink grants.

[0066] Various aspects of duplication for sidelink carrier aggregation are also discussed herein. These aspects include a duplicate is to be sent after the original packet (the UE needs time to activate carrier and monitor). This may be a predefined processing time later than the original packet. These aspects also include a configured grant for sidelink as for Uu, that indicates by one bit in the SCI that the allocated resources are a configured grant, e.g., recurring resources with certain indicated periodicity (reserved resources indicate periodicity). These aspects also include rules are defined when duplication is activated by the Tx UE (similar to a survival time mechanism). These aspects also include a sidelink TB which contains PDCP SDU which is to be duplicated should not be multiplexed with other data, the sidelink TB is to include just the PDCP SDU from the sidelink LCH which is configured for duplication. This may be a new sidelink LCH restriction rule

[0067] Various aspects of DRX for sidelink carrier aggregation for unicast are also discussed herein. These aspects include, a same DRX configuration across carriers. These aspects also include a DRX configuration is configured for one carrier (unicast establishment procedure) and then applied for all carriers. These aspects also include a DRX configuration according to Release 17 rules. [0068] Various aspects of DRX for sidelink carrier aggregation for groupcast are also discussed herein. These aspects include, there is a preconfigured DRX configuration per PQI/destination ID and for the case that a service can be mapped to multiple carriers then same DRX configuration should be used for all available carriers, which leads to DRX per carrier. These aspects also include service/destination ID to carrier mapping defines also the DRX pattern/configuration per carrier.

[0069] Various aspects of CSI reporting for sidelink carrier aggregation are also discussed herein. These aspects include a CSI-report (per carrier per resource pool or cross carrier reporting is also possible). These aspects also include reporting can be done in a different sidelink carrier in order to meet the latency requirement. These aspects also include defining a resource pool for signaling/CSI reporting (e.g., like physical uplink control channel (PUCCH) reporting on Uu for multiple carrier). These aspects also include MAC CE to carrier /resource pool, relative priority order of MAC CE (activation CCs, CSI reporting (multiple carrier) , inter-UE coordination (IUC)), and a format of CSI MAC CE.

[0070] FIG. 3 illustrates an example of a block diagram 300 of a device 302 that supports sidelink carrier aggregation selection in accordance with aspects of the present disclosure. The device 302 may be an example of a UE 104 as described herein. The device 302 may support wireless communication and/or network signaling with one or more base stations 102, other UEs 104, network entities and devices, or any combination thereof. The device 302 may include components for bi-directional communications including components for transmitting and receiving communications, such as a communications manager 304, a processor 306, a memory 308, a receiver 310, a transmitter 312, and an VO controller 314. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses).

[0071] The communications manager 304, the receiver 310, the transmitter 312, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. For example, the communications manager 304, the receiver 310, the transmitter 312, or various combinations or components thereof may support a method for performing one or more of the functions described herein. [0072] In some implementations, the communications manager 304, the receiver 310, the transmitter 312, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry). The hardware may include a processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure. In some implementations, the processor 306 and the memory 308 coupled with the processor 306 may be configured to perform one or more of the functions described herein (e.g., by executing, by the processor 306, instructions stored in the memory 308).

[0073] Additionally or alternatively, in some implementations, the communications manager 304, the receiver 310, the transmitter 312, or various combinations or components thereof may be implemented in code (e.g., as communications management software or firmware) executed by the processor 306. If implemented in code executed by the processor 306, the functions of the communications manager 304, the receiver 310, the transmitter 312, or various combinations or components thereof may be performed by a general-purpose processor, a DSP, a central processing unit (CPU), an ASIC, an FPGA, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting a means for performing the functions described in the present disclosure).

[0074] In some implementations, the communications manager 304 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the receiver 310, the transmitter 312, or both. For example, the communications manager 304 may receive information from the receiver 310, send information to the transmitter 312, or be integrated in combination with the receiver 310, the transmitter 312, or both to receive information, transmit information, or perform various other operations as described herein. Although the communications manager 304 is illustrated as a separate component, in some implementations, one or more functions described with reference to the communications manager 304 may be supported by or performed by the processor 306, the memory 308, or any combination thereof. For example, the memory 308 may store code, which may include instructions executable by the processor 306 to cause the device 302 to perform various aspects of the present disclosure as described herein, or the processor 306 and the memory 308 may be otherwise configured to perform or support such operations.

[0075] For example, the communications manager 304 may support wireless communication and/or network signaling at a device (e.g., the device 302, a UE) in accordance with examples as disclosed herein. The communications manager 304 and/or other device components may be configured as or otherwise support an apparatus, such as a UE, including a transceiver; a processor coupled to the transceiver, the processor and the transceiver configured to cause the apparatus to: select, based at least in part on a sidelink LCP procedure or a carrier criteria, a set of sidelink carriers from a plurality of sidelink carriers the apparatus is configured with; select, based on one or more criteria, one or more sidelink carriers from the set of sidelink carriers; and transmit, to one or more UEs, data using the one or more sidelink carriers.

[0076] Additionally, the apparatus (e.g., a UE) includes any one or combination of: where the processor and the transceiver are further configured to cause the apparatus to select the set of sidelink carriers by: determining one or more sidelink LCHs as a result of the sidelink LCP procedure; and select the set of sidelink carriers based at least in part on logical channel restrictions configured for the determined one or more sidelink LCHs; where the processor and the transceiver are further configured to cause the apparatus to select, as the set of sidelink carriers, sidelink carriers of the plurality of sidelink carriers that satisfy the logical channel restrictions associated with the one or more sidelink LCHs; where the carrier criteria comprises a CBR or a RSRP, and the processor and the transceiver are further configured to cause the apparatus to: select the set of sidelink carriers based at least in part on the CBR or the RSRP; and select the one or more sidelink carriers from the set of sidelink carriers by determining carriers of the set of sidelink carriers that satisfy logical channel restrictions associated with one or more sidelink logical channels; where the processor and the transceiver are further configured to cause the apparatus to select the one or more sidelink carriers by performing a resource selection procedure across all of the sidelink carriers in the set of sidelink carriers; where the processor and the transceiver are further configured to cause the apparatus to select the one or more sidelink carriers based on a predefined priority order of the sidelink carriers in the set of sidelink carriers; where the processor and the transceiver are further configured to cause the apparatus to: transmit, to a UE of the one or more UEs on a first carrier of the one or more sidelink carriers, a first signaling indicating a request for CSI; and receive, from the UE on a second carrier of the one or more sidelink carriers, a second signaling indicating the CSI, where the first carrier and the second carrier are different carriers; where the processor and the transceiver are further configured to cause the apparatus to: transmit, to a UE of the one or more UEs, a first signaling indicating a request for CSI; and receive, from the UE on a predefined resource pool or sidelink carrier of the one or more sidelink carriers, a second signaling indicating the CSI; where the first signaling indicates a request for CSI information for particular ones of the one or more sidelink carriers, and the second signaling comprises a sidelink CSI MAC CE including CSI for each of the particular ones of the one or more sidelink carriers; where the processor and the transceiver are further configured to cause the apparatus to: transmit, to the one or more UEs, a first signaling indicating sidelink control information including that a sidelink TB is duplicated; transmit, to the one or more UEs after transmitting the first signaling, first data including the sidelink TB; and transmit, to the one or more UEs after transmitting the data including the sidelink TB, second data including a duplicate of the sidelink TB; where the processor and the transceiver are further configured to cause the apparatus to transmit the second data a predefined processing time after transmitting the first data; where the processor and the transceiver are further configured to cause the apparatus to: receive, from a base station, a set of configured grant resources for duplicating the sidelink TB; and include, in the sidelink control information, a bit indicating that a duplicate sidelink TB is transmitted on the set of configured grant resources; where the processor and the transceiver are further configured to activate duplication of the sidelink TB in response to a set of rules or criteria indicating to activate duplication of the sidelink TB; where the processor and the transceiver are further configured to, in response to the duplicate of the sidelink TB including a PDCP SDU of a logical channel, transmit the duplicate of the sidelink TB without multiplexing data of other logical channels with the duplicate of the sidelink TB; where the processor and the transceiver are further configured to cause the apparatus to: configure, for a device pair including the apparatus and a UE of the one or more UEs, a DRX configuration for one sidelink carrier of the one or more sidelink carriers; and apply, for the device pair, the DRX configuration for each of the one or more sidelink carriers other than the one sidelink carrier; where the processor and the transceiver are further configured to cause the apparatus to apply, for a groupcast communication across a subset of the one or more sidelink carriers, a preconfigured DRX configuration per PC5 quality of service identifier or destination identifier.

[0077] The communications manager 304 and/or other device components may be configured as or otherwise support an apparatus, such as a UE, including a transceiver; a processor coupled to the transceiver, the processor and the transceiver configured to cause the apparatus to: receive, from a UE, data using one or more sidelink carriers selected by the UE; receive, from the UE on a first carrier of the one or more sidelink carriers, a first signaling indicating a request for CSI; and transmit, to the UE on a second carrier of the one or more sidelink carriers, a second signaling indicating the CSI, where the first carrier and the second carrier are different carriers.

[0078] Additionally, the apparatus (e.g., a UE) includes any one or combination of: where the processor and the transceiver are further configured to cause the apparatus to transmit, to the UE, the second signaling on a predefined resource pool or sidelink carrier of the one or more sidelink carriers; where the first signaling indicates a request for CSI for particular ones of the one or more sidelink carriers, and the second signaling comprises a sidelink CSI MAC CE including CSI for each of the particular ones of the one or more sidelink carriers; where the processor and the transceiver are further configured to cause the apparatus to: receive, from the UE, a third signaling indicating sidelink control information including that a sidelink TB is duplicated; receive, from the UE after receiving the third signaling, first data including the sidelink TB; and receive, from the UE after receiving the data including the sidelink TB, second data including a duplicate of the sidelink TB; where the sidelink control information includes a bit indicating that the duplicate of the sidelink TB is transmitted on a set of configured grant resources; where the processor and the transceiver are further configured to cause the apparatus to: configure, for a device pair including the apparatus and the UE, a DRX configuration for one sidelink carrier of the one or more sidelink carriers; and apply, for the device pair, the DRX configuration for each of the one or more sidelink carriers other than the one sidelink carrier; where the processor and the transceiver are further configured to cause the apparatus to apply, for a groupcast communication across a subset of the one or more sidelink carriers, a preconfigured DRX configuration per PC5 quality of service identifier or destination identifier.

[0079] The communications manager 304 and/or other device components may be configured as or otherwise support a means for wireless communication and/or network signaling at a UE, including selecting, based at least in part on a sidelink LCP procedure or a carrier criteria, a set of sidelink carriers from a plurality of sidelink carriers an apparatus is configured with; selecting, based on one or more criteria, one or more sidelink carriers from the set of sidelink carriers; and transmitting, to one or more UEs, data using the one or more sidelink carriers. [0080] Additionally, wireless communication and/or network signaling at the UE includes any one or combination of: selecting the set of sidelink carriers by: determining one or more sidelink LCHs as a result of the sidelink LCP procedure; and selecting the set of sidelink carriers based at least in part on logical channel restrictions configured for the determined one or more sidelink LCHs; selecting, as the set of sidelink carriers, sidelink carriers of the plurality of sidelink carriers that satisfy the logical channel restrictions associated with the one or more sidelink LCHs; where the carrier criteria comprises a CBR or a RSRP, and further including: selecting the set of sidelink carriers based at least in part on the CBR or the RSRP; and selecting the one or more sidelink carriers from the set of sidelink carriers by determining carriers of the set of sidelink carriers that satisfy logical channel restrictions associated with one or more sidelink logical channels; selecting the one or more sidelink carriers by performing a resource selection procedure across all of the sidelink carriers in the set of sidelink carriers; selecting the one or more sidelink carriers based on a predefined priority order of the sidelink carriers in the set of sidelink carriers; transmitting, to a UE of the one or more UEs on a first carrier of the one or more sidelink carriers, a first signaling indicating a request for CSI; and receiving, from the UE on a second carrier of the one or more sidelink carriers, a second signaling indicating the CSI, where the first carrier and the second carrier are different carriers; transmitting, to a UE of the one or more UEs, a first signaling indicating a request for CSI; and receiving, from the UE on a predefined resource pool or sidelink carrier of the one or more sidelink carriers, a second signaling indicating the CSI; where the first signaling indicates a request for CSI for particular ones of the one or more sidelink carriers, and the second signaling comprises a sidelink CSI MAC CE including CSI information for each of the particular ones of the one or more sidelink carriers; transmitting, to the one or more UEs, a first signaling indicating sidelink control information including that a sidelink TB is duplicated; transmitting, to the one or more UEs after transmitting the first signaling, first data including the sidelink TB; and transmitting, to the one or more UEs after transmitting the data including the sidelink TB, second data including a duplicate of the sidelink TB; transmitting the second data a predefined processing time after transmitting the first data; receiving, from a base station, a set of configured grant resources for duplicating the sidelink TB; and including, in the sidelink control information, a bit indicating that a duplicate sidelink TB is transmitted on the set of configured grant resources; activating duplication of the sidelink TB in response to a set of rules or criteria indicating to activate duplication of the sidelink TB; in response to the duplicate of the sidelink TB including a PDCP SDU of a logical channel, transmitting the duplicate of the sidelink TB without multiplexing data of other logical channels with the duplicate of the sidelink TB; configuring, for a device pair including an apparatus implementing the method and a UE of the one or more UEs, a DRX configuration for one sidelink carrier of the one or more sidelink carriers; and applying, for the device pair, the DRX configuration for each of the one or more sidelink carriers other than the one sidelink carrier; applying, for a groupcast communication across a subset of the one or more sidelink carriers, a preconfigured DRX configuration per PC5 quality of service identifier or destination identifier.

[0081] The communications manager 304 and/or other device components may be configured as or otherwise support a means for wireless communication and/or network signaling at a UE, including receiving, from a UE, data using one or more sidelink carriers selected by the UE; receiving, from the UE on a first carrier of the one or more sidelink carriers, a first signaling indicating a request for CSI; and transmitting, to the UE on a second carrier of the one or more sidelink carriers, a second signaling indicating the CSI, where the first carrier and the second carrier are different carriers.

[0082] Additionally, wireless communication and/or network signaling at the UE includes any one or combination of: transmitting, to the UE, the second signaling on a predefined resource pool or sidelink carrier of the one or more sidelink carriers; where the first signaling indicates a request for CSI for particular ones of the one or more sidelink carriers, and the second signaling comprises a sidelink CSI MAC CE including CSI for each of the particular ones of the one or more sidelink carriers; receiving, from the UE, a third signaling indicating sidelink control information including that a sidelink TB is duplicated; receiving, from the UE after receiving the third signaling, first data including the sidelink TB; and receiving, from the UE after receiving the data including the sidelink TB, second data including a duplicate of the sidelink TB; where the sidelink control information includes a bit indicating that the duplicate of the sidelink TB is transmitted on a set of configured grant resources; configuring, for a device pair including an apparatus implementing the method and the UE, a DRX configuration for one sidelink carrier of the one or more sidelink carriers; and applying, for the device pair, the DRX configuration for each of the one or more sidelink carriers other than the one sidelink carrier; applying, for a groupcast communication across a subset of the one or more sidelink carriers, a preconfigured DRX configuration per PC5 quality of service identifier or destination identifier. [0083] The processor 306 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some implementations, the processor 306 may be configured to operate a memory array using a memory controller. In some other implementations, a memory controller may be integrated into the processor 306. The processor 306 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 308) to cause the device 302 to perform various functions of the present disclosure.

[0084] The memory 308 may include random access memory (RAM) and read-only memory (ROM). The memory 308 may store computer-readable, computer-executable code including instructions that, when executed by the processor 306 cause the device 302 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some implementations, the code may not be directly executable by the processor 306 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some implementations, the memory 308 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.

[0085] The I/O controller 314 may manage input and output signals for the device 302. The I/O controller 314 may also manage peripherals not integrated into the device 302. In some implementations, the I/O controller 314 may represent a physical connection or port to an external peripheral. In some implementations, the I/O controller 314 may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, or another known operating system. In some implementations, the RO controller 314 may be implemented as part of a processor, such as the processor 306. In some implementations, a user may interact with the device 302 via the I/O controller 314 or via hardware components controlled by the RO controller 314.

[0086] In some implementations, the device 302 may include a single antenna 316. However, in some other implementations, the device 302 may have more than one antenna 316, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The receiver 310 and the transmitter 312 may communicate bi-directionally, via the one or more antennas 316, wired, or wireless links as described herein. For example, the receiver 310 and the transmitter 312 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 316 for transmission, and to demodulate packets received from the one or more antennas 316.

[0087] FIG. 4 illustrates an example of a block diagram 400 of a device 402 that supports sidelink carrier aggregation selection in accordance with aspects of the present disclosure. The device 402 may be an example of a network entity (e.g., a base station 102, such as a gNB), as described herein. The device 402 may support wireless communication and/or network signaling with one or more base stations 102, other UEs 104, core network devices and functions (e.g., core network 106), or any combination thereof. The device 402 may include components for bi-directional communications including components for transmitting and receiving communications, such as a communications manager 404, a processor 406, a memory 408, a receiver 410, a transmitter 412, and an I/O controller 414. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses).

[0088] The communications manager 404, the receiver 410, the transmitter 412, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. For example, the communications manager 404, the receiver 410, the transmitter 412, or various combinations or components thereof may support a method for performing one or more of the functions described herein.

[0089] In some implementations, the communications manager 404, the receiver 410, the transmitter 412, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry). The hardware may include a processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure. In some implementations, the processor 406 and the memory 408 coupled with the processor 406 may be configured to perform one or more of the functions described herein (e.g., by executing, by the processor 406, instructions stored in the memory 408). [0090] Additionally or alternatively, in some implementations, the communications manager 404, the receiver 410, the transmitter 412, or various combinations or components thereof may be implemented in code (e.g., as communications management software or firmware) executed by the processor 406. If implemented in code executed by the processor 406, the functions of the communications manager 404, the receiver 410, the transmitter 412, or various combinations or components thereof may be performed by a general-purpose processor, a DSP, a central processing unit (CPU), an ASIC, an FPGA, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting a means for performing the functions described in the present disclosure).

[0091] In some implementations, the communications manager 404 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the receiver 410, the transmitter 412, or both. For example, the communications manager 404 may receive information from the receiver 410, send information to the transmitter 412, or be integrated in combination with the receiver 410, the transmitter 412, or both to receive information, transmit information, or perform various other operations as described herein. Although the communications manager 404 is illustrated as a separate component, in some implementations, one or more functions described with reference to the communications manager 404 may be supported by or performed by the processor 406, the memory 408, or any combination thereof. For example, the memory 408 may store code, which may include instructions executable by the processor 406 to cause the device 402 to perform various aspects of the present disclosure as described herein, or the processor 406 and the memory 408 may be otherwise configured to perform or support such operations.

[0092] For example, the communications manager 404 may support wireless communication and/or network signaling at a device (e.g., the device 402, a network entity) in accordance with examples as disclosed herein. The communications manager 404 and/or other device components may be configured as or otherwise support a means for wireless communication and/or network signaling at a network entity.

[0093] The processor 406 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some implementations, the processor 406 may be configured to operate a memory array using a memory controller. In some other implementations, a memory controller may be integrated into the processor 406. The processor 406 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 408) to cause the device 402 to perform various functions of the present disclosure.

[0094] The memory 408 may include random access memory (RAM) and read-only memory (ROM). The memory 408 may store computer-readable, computer-executable code including instructions that, when executed by the processor 406 cause the device 402 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some implementations, the code may not be directly executable by the processor 406 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some implementations, the memory 408 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.

[0095] The I/O controller 414 may manage input and output signals for the device 402. The I/O controller 414 may also manage peripherals not integrated into the device 402. In some implementations, the I/O controller 414 may represent a physical connection or port to an external peripheral. In some implementations, the I/O controller 414 may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, or another known operating system. In some implementations, the I/O controller 414 may be implemented as part of a processor, such as the processor 406. In some implementations, a user may interact with the device 402 via the I/O controller 414 or via hardware components controlled by the I/O controller 414.

[0096] In some implementations, the device 402 may include a single antenna 416. However, in some other implementations, the device 402 may have more than one antenna 416, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The receiver 410 and the transmitter 412 may communicate bi-directionally, via the one or more antennas 416, wired, or wireless links as described herein. For example, the receiver 410 and the transmitter 412 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 416 for transmission, and to demodulate packets received from the one or more antennas 416. [0097] FIG. 5 illustrates a flowchart of a method 500 that supports sidelink carrier aggregation selection in accordance with aspects of the present disclosure. The operations of the method 500 may be implemented and performed by a device or its components, such as a UE 104 as described with reference to FIGs. 1 through 4. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.

[0098] At 502, the method may include selecting, based at least in part on a sidelink LCP procedure or a carrier criteria, a set of sidelink carriers from a plurality of sidelink carriers the apparatus is configured with. The operations of 502 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 502 may be performed by a device as described with reference to FIG. 1.

[0099] At 504, the method may include selecting, based on one or more criteria, one or more sidelink carriers from the set of sidelink carriers. The operations of 504 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 504 may be performed by a device as described with reference to FIG. 1.

[0100] At 506, the method may include transmitting, to one or more UEs, data using the one or more sidelink carriers. The operations of 506 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 506 may be performed by a device as described with reference to FIG. 1.

[0101] FIG. 6 illustrates a flowchart of a method 600 that supports sidelink carrier aggregation selection in accordance with aspects of the present disclosure. The operations of the method 600 may be implemented and performed by a device or its components, such as a UE 104 as described with reference to FIGs. 1 through 4. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.

[0102] At 602, the method may include determining one or more sidelink LCHs as a result of the sidelink LCP procedure. The operations of 602 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 602 may be performed by a device as described with reference to FIG. 1.

[0103] At 604, the method may include selecting the set of sidelink carriers based at least in part on logical channel restrictions configured for the determined one or more sidelink LCHs. The operations of 604 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 604 may be performed by a device as described with reference to FIG. 1.

[0104] FIG. 7 illustrates a flowchart of a method 700 that supports sidelink carrier aggregation selection in accordance with aspects of the present disclosure. The operations of the method 700 may be implemented and performed by a device or its components, such as a UE 104 as described with reference to FIGs. 1 through 4. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.

[0105] At 702, the method may include selecting the set of sidelink carriers based at least in part on the CBR or the RSRP. The operations of 702 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 702 may be performed by a device as described with reference to FIG. 1.

[0106] At 704, the method may include selecting the one or more sidelink carriers from the set of sidelink carriers by determining carriers of the set of sidelink carriers that satisfy logical channel restrictions associated with one or more sidelink logical channels. The operations of 704 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 704 may be performed by a device as described with reference to FIG. 1.

[0107] FIG. 8 illustrates a flowchart of a method 800 that supports sidelink carrier aggregation selection in accordance with aspects of the present disclosure. The operations of the method 800 may be implemented and performed by a device or its components, such as a UE 104 as described with reference to FIGs. 1 through 4. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.

[0108] At 802, the method may include transmitting, to the one or more UEs, a first signaling indicating sidelink control information including that a sidelink TB is duplicated. The operations of 802 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 802 may be performed by a device as described with reference to FIG. 1.

[0109] At 804, the method may include transmitting, to the one or more UEs after transmitting the first signaling, first data including the sidelink TB. The operations of 804 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 804 may be performed by a device as described with reference to FIG. 1.

[0110] At 806, the method may include transmitting, to the one or more UEs after transmitting the data including the sidelink TB, second data including a duplicate of the sidelink TB. The operations of 806 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 806 may be performed by a device as described with reference to FIG. 1.

[0111] FIG. 9 illustrates a flowchart of a method 900 that supports sidelink carrier aggregation selection in accordance with aspects of the present disclosure. The operations of the method 900 may be implemented and performed by a device or its components, such as a UE 104 as described with reference to FIGs. 1 through 4. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.

[0112] At 902, the method may include receiving, from a UE, data using one or more sidelink carriers selected by the UE. The operations of 902 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 902 may be performed by a device as described with reference to FIG. 1.

[0113] At 904, the method may include receiving, from the UE on a first carrier of the one or more sidelink carriers, a first signaling indicating a request for CSI. The operations of 904 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 904 may be performed by a device as described with reference to FIG. 1.

[0114] At 906, the method may include transmitting, to the UE on a second carrier of the one or more sidelink carriers, a second signaling indicating the CSI, wherein the first carrier and the second carrier are different carriers. The operations of 906 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 906 may be performed by a device as described with reference to FIG. 1.

[0115] FIG. 10 illustrates a flowchart of a method 1000 that supports sidelink carrier aggregation selection in accordance with aspects of the present disclosure. The operations of the method 1000 may be implemented and performed by a device or its components, such as a UE 104 as described with reference to FIGs. 1 through 4. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.

[0116] At 1002, the method may include receiving, from the UE, a third signaling indicating sidelink control information including that a sidelink TB is duplicated. The operations of 1002 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1002 may be performed by a device as described with reference to FIG. 1.

[0117] At 1004, the method may include receiving, from the UE after receiving the third signaling, first data including the sidelink TB. The operations of 1004 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1004 may be performed by a device as described with reference to FIG. 1.

[0118] At 1006, the method may include receiving, from the UE after receiving the data including the sidelink TB, second data including a duplicate of the sidelink TB. The operations of 1006 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1006 may be performed by a device as described with reference to FIG. 1.

[0119] It should be noted that the methods described herein describe possible implementations, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible. Further, aspects from two or more of the methods may be combined. The order in which the methods are described is not intended to be construed as a limitation, and any number or combination of the described method operations may be performed in any order to perform a method, or an alternate method.

[0120] The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed with a general-purpose processor, a DSP, an ASIC, a CPU, 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.

[0121] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on 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.

[0122] 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 place 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 specialpurpose processor.

[0123] Any connection may be properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, 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 where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer- readable media.

[0124] 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). Similarly, a list of one or more 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). Similarly, a list of one or more 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). Similarly, 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. Further, as used herein, including in the claims, a “set” may include one or more elements.

[0125] 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 instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described example.

[0126] 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

CLAIMS What is claimed is:

1. An apparatus, comprising: a transceiver; and a processor coupled to the transceiver, the processor and the transceiver configured to cause the apparatus to: select, based at least in part on a sidelink logical channel prioritization (LCP) procedure or a carrier criteria, a set of sidelink carriers from a plurality of sidelink carriers the apparatus is configured with; select, based on one or more criteria, one or more sidelink carriers from the set of sidelink carriers; and transmit, to one or more user equipments (UEs), data using the one or more sidelink carriers.

2. The apparatus of claim 1, wherein the processor and the transceiver are further configured to cause the apparatus to select the set of sidelink carriers by: determining one or more sidelink logical channels (LCHs) as a result of the sidelink LCP procedure; and select the set of sidelink carriers based at least in part on logical channel restrictions configured for the determined one or more sidelink LCHs.

3. The apparatus of claim 2, wherein the processor and the transceiver are further configured to cause the apparatus to select, as the set of sidelink carriers, sidelink carriers of the plurality of sidelink carriers that satisfy the logical channel restrictions associated with the one or more sidelink LCHs.

4. The apparatus of claim 1 , wherein the carrier criteria comprises a channel busy ratio (CBR) or a reference signal received power (RSRP), and the processor and the transceiver are further configured to cause the apparatus to: select the set of sidelink carriers based at least in part on the CBR or the RSRP; and select the one or more sidelink carriers from the set of sidelink carriers by determining carriers of the set of sidelink carriers that satisfy logical channel restrictions associated with one or more sidelink logical channels.

5. The apparatus of claim 1, wherein the processor and the transceiver are further configured to cause the apparatus to select the one or more sidelink carriers by performing a resource selection procedure across all of the sidelink carriers in the set of sidelink carriers.

6. The apparatus of claim 1, wherein the processor and the transceiver are further configured to cause the apparatus to select the one or more sidelink carriers based on a predefined priority order of the sidelink carriers in the set of sidelink carriers.

7. The apparatus of claim 1, wherein the processor and the transceiver are further configured to cause the apparatus to: transmit, to a UE of the one or more UEs on a first carrier of the one or more sidelink carriers, a first signaling indicating a request for channel state information (CSI); and receive, from the UE on a second carrier of the one or more sidelink carriers, a second signaling indicating the CSI, wherein the first carrier and the second carrier are different carriers.

8. The apparatus of claim 1, wherein the processor and the transceiver are further configured to cause the apparatus to: transmit, to a UE of the one or more UEs, a first signaling indicating a request for channel state information (CSI); and receive, from the UE on a predefined resource pool or sidelink carrier of the one or more sidelink carriers, a second signaling indicating the CSI.

9. The apparatus of claim 8, wherein the first signaling indicates a request for CSI for particular ones of the one or more sidelink carriers, and the second signaling comprises a sidelink CSI medium access control (MAC) control element (CE) including CSI for each of the particular ones of the one or more sidelink carriers.

10. The apparatus of claim 1, wherein the processor and the transceiver are further configured to cause the apparatus to: transmit, to the one or more UEs, a first signaling indicating sidelink control information including that a sidelink transport block (TB) is duplicated; transmit, to the one or more UEs after transmitting the first signaling, first data including the sidelink TB; and transmit, to the one or more UEs after transmitting the data including the sidelink TB, second data including a duplicate of the sidelink TB.

11. The apparatus of claim 10, wherein the processor and the transceiver are further configured to cause the apparatus to transmit the second data a predefined processing time after transmitting the first data.

12. The apparatus of claim 10, wherein the processor and the transceiver are further configured to cause the apparatus to: receive, from a base station, a set of configured grant resources for duplicating the sidelink TB; and include, in the sidelink control information, a bit indicating that a duplicate sidelink TB is transmitted on the set of configured grant resources.

13. The apparatus of claim 10, wherein the processor and the transceiver are further configured to activate duplication of the sidelink TB in response to a set of rules or criteria indicating to activate duplication of the sidelink TB.

14. The apparatus of claim 10, wherein the processor and the transceiver are further configured to, in response to the duplicate of the sidelink TB including a packet data convergence protocol (PDCP) service data unit (SDU) of a logical channel, transmit the duplicate of the sidelink TB without multiplexing data of other logical channels with the duplicate of the sidelink TB.

15. The apparatus of claim 1, wherein the processor and the transceiver are further configured to cause the apparatus to: configure, for a device pair including the apparatus and a UE of the one or more UEs, a discontinuous reception (DRX) configuration for one sidelink carrier of the one or more sidelink carriers; and apply, for the device pair, the DRX configuration for each of the one or more sidelink carriers other than the one sidelink carrier.

16. The apparatus of claim 1, wherein the processor and the transceiver are further configured to cause the apparatus to apply, for a groupcast communication across a subset of the one or more sidelink carriers, a preconfigured discontinuous reception (DRX) configuration per PC5 quality of service identifier or destination identifier.

17. An apparatus, comprising: a transceiver; a processor coupled to the transceiver, the processor and the transceiver configured to cause the apparatus to: receive, from a user equipment (UE), data using one or more sidelink carriers selected by the UE; receive, from the UE on a first carrier of the one or more sidelink carriers, a first signaling indicating a request for channel state information (CSI); and transmit, to the UE on a second carrier of the one or more sidelink carriers, a second signaling indicating the CSI, wherein the first carrier and the second carrier are different carriers.

18. The apparatus of claim 17, wherein the processor and the transceiver are further configured to cause the apparatus to transmit, to the UE, the second signaling on a predefined resource pool or sidelink carrier of the one or more sidelink carriers.

19. The apparatus of claim 18, wherein the first signaling indicates a request for CSI for particular ones of the one or more sidelink carriers, and the second signaling comprises a sidelink CSI medium access control (MAC) control element (CE) including CSI for each of the particular ones of the one or more sidelink carriers.

20. A method, comprising: selecting, based at least in part on a sidelink logical channel prioritization (LCP) procedure or a carrier criteria, a set of sidelink carriers from a plurality of sidelink carriers an apparatus is configured with; selecting, based on one or more criteria, one or more sidelink carriers from the set of sidelink carriers; and transmitting, to one or more user equipments (UEs), data using the one or more sidelink carriers.