Carrier selection in a distributed dual-band carrier aggregation system

Abstract

Aspects of the disclosure provide devices, methods, processing systems, and computer readable media for channel selection in systems utilizing both licensed and unlicensed bands. As will be described in greater detail below, user equipment (UEs) sharing an unlicensed band can select a channel in the unlicensed band and advertise their channel selection on a licensed band in an effort to coordinate communications with other UEs. An example method can include selecting at least a first channel within an unlicensed band for communication with at least a second UE, and transmitting an indication of the first channel and location information regarding the selection on a licensed band.

Description

[0001] CLAIM

[0002] This application claims priority to Greek Provisional Application No. 20200100368 filed June 24, 2020, which is hereby expressly incorporated by reference in its entirety for all purposes as if fully set forth below.

[0003] INTRODUCTION

[0004] Aspects of the present disclosure relate to wireless communications, and more particularly, to channel selection in systems utilizing both licensed and unlicensed bands.

[0005] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, etc. These wireless communication systems can employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and others.

[0006] In some examples, a wireless multiple-access communication system can include a number of base stations (BSs), which are each capable of simultaneously supporting communication for multiple communication devices, otherwise known as user equipments (UEs). In an LTE or LTE-A network, a set of one or more base stations can define an eNodeB (eNB). In other examples (e.g., in a next generation, new radio (NR), or 5G network), a wireless multiple access communication system can include a number of distributed units (DUs) (e.g., edge units (EUs), edge nodes (ENs), radio heads (RHs), smart radio heads (SRHs), transmission reception points (TRPs), etc.) in communication with a number of central units (CUs) (e.g., central nodes (CNs), access node controllers (ANC), etc.), where a set of one or more DUs, in communication with a CU, can define an access node (e.g., which can be referred to as a BS, 5G NB, next generation NodeB (gNB or gNodeB), transmission reception point (TRP), etc.). BSs or DUs can communicate with a set of UEs on downlink channels (e.g., for transmissions from a BS or DU to a UE) and uplink channels (e.g., for transmissions from a UE to a BS or DU).

[0007] These multiple access technologies have been adopted in various telecommunication standards to provide common protocols that enable different wireless devices to communicate on a municipal, national, regional, and even global level. NR (e.g., New Radio or 5G) is an example of an emerging telecommunication standard. NR is a set of enhancements to the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using OFDMA with a cyclic prefix (CP) on the downlink (DL) and on the uplink (UL). To these ends, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0008] Sidelink communication is communication from one UE to another UE. As the demand for mobile broadband access continues to increase, there exists a need for further improvements in NR and LTE technology, including improvements in sidelink communication. Preferably, these improvements should be applicable to other multi-access technologies and the telecommunication standards that employ these technologies.

[0009] Further, as additional resources, such as both licensed and unlicensed spectrum, are deployed in systems, there are various challenges and opportunities to optimize such resources.

[0010] SUMMARY

[0011] The systems, methods, and devices of the disclosure each have several aspects, no single one of which is solely responsible for its desirable attributes. Without limiting the scope of this disclosure as expressed by the claims that follow, some features will now be discussed briefly. The instant disclosure will be described with reference to illustrative examples. In such descriptions, aspects can be described, by reference to "optional" features to indicate that the particular feature is optional, and thus can or can not be present in any particular implementation. Thus, the various aspects described herein, which include the optional features, can be combined in any manner, and the place of the features can be combined in any manner, unless the description states otherwise. The instant disclosure will be described with reference to a wireless communication system. The following description includes information that can be useful in understanding the present disclosure. It is not an admission that any of the information provided necessarily forms part of the prior art nor that any of the references provided necessarily

[0012] Certain aspects of the present disclosure provide a method for wireless communications by a first transmitting user equipment (UE) to perform sidelink communications with a second receiving UE. The method generally includes monitoring an unlicensed frequency band, selecting at least a first channel within the unlicensed frequency band for communications with at least a second UE based on the monitoring, and advertising the first channel and location information regarding the selection on a licensed frequency band.

[0013] Certain aspects of the present disclosure provide an apparatus for wireless communications by a first transmitting user equipment (UE) to perform sidelink communications with a second receiving UE. The apparatus generally includes means for monitoring an unlicensed frequency band, means for selecting at least a first channel within the unlicensed frequency band for communications with at least a second UE based on the monitoring, and means for advertising the first channel and location information regarding the selection on a licensed frequency band.

[0014] Certain aspects of the present disclosure provide a computer readable medium having computer executable code stored thereon for communication. The computer readable medium generally includes code for monitoring an unlicensed band, selecting at least a first channel within the unlicensed band for communication with at least a second UE based on the monitoring, and advertising the first channel and location information regarding the selection on a licensed band.

[0015] Certain aspects of the present disclosure provide an apparatus for wireless communication by a first UE. The apparatus generally includes a memory and at least one processor coupled to the memory, the memory and the at least one processor configured to monitor an unlicensed band, select at least a first channel within the unlicensed band for communication with at least a second UE based on the monitoring, and advertise the first channel and location information regarding the selection on a licensed band.

[0016] Certain aspects of the present disclosure provide a method for wireless communication by a first transmitting user equipment (UE) for sidelink communication with a second receiving UE. The method generally includes selecting at least a first channel within an unlicensed band for communication with at least a second UE, and transmitting an indication of the first channel and location information regarding the selection on a licensed band.

[0017] Certain aspects of the present disclosure provide an apparatus for wireless communication by a first transmitting UE for sidelink communication with a second receiving UE. The apparatus generally includes means for selecting at least a first channel within an unlicensed band for communication with at least a second UE, and means for transmitting an indication of the first channel and location information regarding the selection on a licensed band.

[0018] Certain aspects of the present disclosure provide a computer readable medium having computer executable code stored thereon for communication. The computer readable medium generally includes code for selecting at least a first channel within an unlicensed band for communication with at least a second UE, and transmitting an indication of the first channel and location information regarding the selection on a licensed band.

[0019] Certain aspects of the present disclosure provide an apparatus for wireless communication by a first UE. The apparatus generally includes a memory and at least one processor coupled to the memory, the memory and the at least one processor configured to select at least a first channel within an unlicensed band for communication with at least a second UE, and transmit an indication of the first channel and location information regarding the selection on a licensed band.

[0020] Certain aspects of the present disclosure provide a method for wireless communications by a first transmitting UE to communicate with a second receiving UE in sidelink communications. The method generally includes receiving, from the second UE, a first indication of a first channel within an unlicensed band for communicating with the second UE on an licensed band, and transmitting, on the licensed band, an indication of a preferred channel and location information about the preferred channel, where the preferred channel comprises the first channel or a second channel.

[0021] Certain aspects of the present disclosure provide an apparatus for wireless communications by a first transmitting UE to communicate with a second receiving UE in sidelink communications. The apparatus generally includes means for receiving, from the second UE, a first indication of a first channel within an unlicensed band for communicating with the second UE on an licensed band, and means for transmitting, on the licensed band, an indication of a preferred channel and location information about the preferred channel, where the preferred channel comprises the first channel or a second channel.

[0022] Certain aspects of the present disclosure provide a computer readable medium having stored thereon computer executable code for communication. The computer readable medium generally includes code for receiving, from a second UE, a first indication of a first channel within an unlicensed band for communicating with the second UE on an licensed band, and transmitting, on the licensed band, an indication of a preferred channel and location information about the preferred channel, where the preferred channel comprises the first channel or a second channel.

[0023] Certain aspects of the present disclosure provide an apparatus for wireless communications by a first UE. The apparatus generally includes a memory and at least one processor coupled to the memory, the memory and the at least one processor configured to receive, from a second UE, a first indication of a first channel within an unlicensed band for communicating with the second UE on an licensed band, and transmit, on the licensed band, an indication of a preferred channel and location information about the preferred channel, where the preferred channel comprises the first channel or a second channel.

[0024] Certain aspects of the present disclosure provide a method for wireless communications by a first transmitting user equipment (UE) to communicate with a second receiving UE in sidelink communications. The method generally includes monitoring an unlicensed band, selecting at least a first channel within the unlicensed band for communicating with at least a second UE based on the monitoring, and advertising, on a licensed band, the first channel and location information about the selection.

[0025] Certain aspects of the present disclosure provide an apparatus for wireless communications by a first transmitting user equipment (UE) to communicate with a second receiving UE over a sidelink. The apparatus generally includes means for monitoring an unlicensed band, means for selecting at least a first channel within the unlicensed band for communicating with at least a second UE based on the monitoring, and means for advertising the first channel and location information regarding the selection on a licensed band.

[0026] Certain aspects of the present disclosure provide a computer readable medium having computer executable code stored thereon for communication. The computer readable medium generally includes code for monitoring an unlicensed band, code for selecting at least a first channel within the unlicensed band for communicating with at least a second UE based on the monitoring, and code for advertising the first channel and location information regarding the selection on a licensed band.

[0027] Certain aspects of the present disclosure provide an apparatus for wireless communications by a first user equipment (UE). The apparatus generally includes a memory and at least one processor coupled to the memory, the memory and the at least one processor configured to monitor an unlicensed band, select at least a first channel within the unlicensed band for communicating with at least a second UE based on the monitoring, and advertise the first channel and location information regarding the selection on a licensed band.

[0028] To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects can be employed. BRIEF DESCRIPTION OF DRAWINGS

[0030] So that the above-recited features and advantages of the above-stated aspects can be understood in detail, a more particular description, briefly summarized above, can be had by reference to various aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description can admit to other equally effective aspects.

[0031] FIG. 1 is a block diagram conceptually illustrating an example telecommunications system, in accordance with certain aspects of the present disclosure.

[0032] FIG. 2 is a block diagram illustrating an example logical architecture of a distributed radio access network (RAN), in accordance with certain aspects of the present disclosure.

[0033] FIG. 3is a block diagram conceptually illustrating a design of an example base station (BS) and user equipment (UE), in accordance with certain aspects of the present disclosure.

[0034] FIG. 4A and FIG. 4B shows a pictorial representation of an example vehicle-to-everything (V2X) system, in accordance with some aspects of the present disclosure.

[0035] FIG. 5 is a schematic diagram illustrating an example network of multiple CV2X devices operating in an unlicensed spectrum, in accordance with certain aspects of the present disclosure.

[0036] FIG. 6 and FIG. 8 illustrates example operations for wireless communication by a UE, in accordance with certain aspects of the present disclosure.

[0037] FIG. 7 illustrates an example algorithm for selecting a channel, in accordance with certain aspects of the present disclosure.

[0038] FIG. 9A-9C , FIG. 10A-10B and FIG. 11A-11B illustrates various use cases for applying channel selection, in accordance with certain aspects of the present disclosure.

[0039] FIG. 12 illustrates a communications device that can include various components configured to perform operations for the methods described FIG. 6 illustrated in the above-described flowcharts.

[0040] FIG. 13 illustrates a communications device that can include various components configured to perform operations for the methods described FIG. 8 illustrated in the above-described flowcharts.

[0041] FIG. 14 illustrates example operations for wireless communication by a UE, in accordance with certain aspects of the present disclosure.

[0042] For purposes of understanding, the same reference numbers are used in the drawings to designate the same elements shown in the figures. It is contemplated that elements disclosed in one aspect can be beneficially utilized in other aspects without specific recitation.

[0043] Detailed Description

[0044] Aspects of the disclosure provide apparatuses, methods, processing systems, and computer readable media for channel selection in systems utilizing both licensed and unlicensed bands. In a distributed system, such as a V2X system in which UEs communicate with one another, channel sensing is done independently by each UE. As such, the results as to which channel is best suited for communication between the UEs can not be the same for all UEs, as different UEs can individually select different channels. However, aspects of the disclosure provide a mechanism that allows UEs within a range (e.g., in close proximity to one another (e.g., within a given range as indicated by a zone ID included in a sidelink transmission by the same)) to identify a common channel suitable for communication between one another.

[0045] As will be described in greater detail below, user equipment (UEs) sharing an unlicensed band can select a channel in the unlicensed band and advertise (e.g., broadcast for the benefit of other UEs) its channel selection on a licensed band in an effort to coordinate communications with other UEs. In some cases, the transmission of an indication of the selected channel and location information can be considered an “advertisement” of such information.

[0046] By advertising the selected (e.g., preferred) channel in this manner, UEs in close proximity to one another (e.g., within transmission range) effectively engage in a best effort procedure to use the same channel in the unlicensed band. As used in this context, best effort generally refers to the possibility that the channel advertised by a UE can be selected based on the maximum effort of that UE, but in one or more examples, can not necessarily be ideal or optimal. Advertising the selected channel in this manner utilizes the licensed band to facilitate broadcast / multicast communications between UEs in a relatively efficient manner.

[0047] The examples described below provide an efficient structure for advertising a selected channel. A UE receiving such a structure can decide, based on an algorithm, whether to switch to the channel selected by another UE or to maintain the current channel selection. The algorithm can take into account various factors, such as whether the advertising UE is a stationary road side unit (RSU) and / or the geographic zone of the advertising UE, to name a few. Aspects of the disclosure can give certain V-UEs, such as stationary nodes (e.g., RSUs), higher priority in the carrier selection process.

[0048] The following description provides examples, and is not limiting of the scope, applicability, or examples set forth in the claims. Changes can be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples can omit, substitute, or add various procedures or components as appropriate. For instance, the methods described can be performed in an order different than described, and other steps can be added, omitted, or combined. Also, features described with respect to some examples can be combined in some other examples. For example, an apparatus can be implemented or a method can be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover devices, methods, and programs made and performed using other structural, functional, or structural and functional combinations of aspects illustrated and described herein. It will be understood that any of the aspects of the disclosure disclosed herein can be implemented by one or more elements of a claim. The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects.

[0049] The techniques described herein can be used for various wireless communication technologies, such as LTE, CDMA, TDMA, FDMA, OFDMA, SC-FDMA and other networks. The terms “network” and “system” are often used interchangeably. A CDMA network can implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. cdma2000 covers IS-2000, IS-95 and IS-856 standards. A TDMA network can implement a radio technology such as Global System for Mobile Communications (GSM). An OFDMA network can implement a radio technology such as NR (e.g. 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash- OFDMA, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS).

[0050] The techniques described herein can be used for various wireless network and radio technologies. While aspects can be described herein using terminology commonly associated with 3G, 4G, and / or new radio (e.g., 5G NR) wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems.

[0051] New Radio (NR) is an emerging wireless communications technology under development in conjunction with the 5G Technology Forum (5GTF). 3GPP Long Term Evolution (LTE) and LTE- Advanced (LTE-A) are releases of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization named “3rd Generation Partnership Project” (3GPP). cdma2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2). The techniques described herein can be used for the wireless networks and radio technologies mentioned above as well as other wireless networks and radio technologies. For clarity, while aspects can be described herein using terminology commonly associated with 3G and / or 4G wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems, such as 5G and later, including NR technologies.

[0052] New radio (NR) access (e.g., 5G technology) can support various wireless communication services such as Enhanced Mobile Broadband (eMBB) that can target wide bandwidth (e.g., 80 MHz or beyond), millimeter wave (mmW) that can target high carrier frequency (e.g., 25 GHz or beyond), massive machine type communications MTC (mMTC) that can target non-backward compatible MTC techniques, and / or mission critical that can target ultra-reliable low-latency communications (URLLC). These services can include latency and reliability requirements. These services can also have different transmission time intervals (TTI) to meet respective quality of service (QoS) requirements. In addition, these services can co-exist in the same subframe.

[0053] FIG. 1 An example wireless communication network 100 in which aspects of the present disclosure can be performed is illustrated. For example, FIG. 1 One or more UEs 120a, 120b of FIG. 6 、 8 and / or 14 to select a channel on an unlicensed band and advertise its channel selection over a licensed band in an effort to coordinate communications with other UEs.

[0054] As FIG. 1As illustrated in the example of FIG. 1, wireless communication network 100 can include a number of base stations (BSs) 110a-z, each individually and / or collectively, sometimes collectively referred to as BS 110, and other network entities. In aspects of the disclosure, a road side service unit (RSU) can be considered a type of BS, and a BS 110 can be referred to as an RSU. A BS 110 can provide communication coverage for a particular geographic area, sometimes referred to as a “cell”, which can be stationary or can move according to the location of a BS 110 (e.g., a mobile BS). In some examples, BSs 110 can be interconnected to one or more other BSs or network nodes (not shown) in wireless communication network 100 through various types of backhaul interfaces (e.g., a direct physical connection, a wireless connection, a virtual network, or the like) using any suitable transport network. FIG. 1 In the example as shown in FIG. 1, BSs 110a, 110b, and 110c can be macro BSs for macro cells 102a, 102b, and 102c, respectively. BS 110x can be a pico BS for a pico cell 102x. BSs 110y and 110z can be femto BSs for femto cells 102y and 102z, respectively. A BS can support one or multiple cells. BSs 110 communicate with UEs 120a-y, which each can be dispersed throughout wireless communication network 100, and each can be stationary or mobile.

[0055] Wireless communication network 100 can also include relay stations (e.g., relay station 11 Or), also referred to as relays, that receive a transmission of data and / or other information from an upstream station (e.g., a BS 110a or a UE 120r) and sends a transmission of the data and / or other information to a downstream station (e.g., a UE 120 or a BS 110), or that relays transmissions between UEs 120 to facilitate communication between devices.

[0056] A network controller 130 can couple to a set of BSs 110 and provide coordination and control for these BSs 110. Network controller 130 can be in communication with the BSs 110 via a backhaul. The BSs 110 can also communicate with one another (e.g., directly or indirectly) via a wireless or wireline backhaul.

[0057] The UEs 120 (e.g., 120x, 120y, etc.) can be dispersed throughout the wireless communication network 100, and each UE can be stationary or mobile. A UE can also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a client, a customer premises equipment (CPE), a cellular phone, a smartphone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, an electric

[0058] Certain wireless networks (e.g., LTE) utilize orthogonal frequency division multiplexing (OFDM) on the downlink and single-carrier frequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDM partition the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, etc. Each subcarrier can be modulated with data. In general, modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM. The spacing of adjacent subcarriers can be fixed, and the total number of subcarriers (K) can be dependent on the system bandwidth. For example, the spacing of the subcarriers can be 15 kHz and the minimum resource allocation (called a “resource block” (RB)) can be 12 subcarriers (or 180 kHz). Consequently, the nominal fast fourier transfer (FFT) size can be equal to 128, 256, 512, 1024 or 2048 for system bandwidth of 1.25, 2.5, 5, 10, or 20 megahertz (MHz), respectively. The system bandwidth can also be partitioned into subbands. For example, a subband can cover 1.08 MHz (i.e., 6 resource blocks), and there can be 1, 2, 4, 8, or 16 subbands for system bandwidth of 1.25, 2.5, 5, 10, or 20 MHz, respectively.

[0059] While aspects of the examples described herein can be associated with LTE technologies, aspects of the present disclosure can be applicable with other wireless communications systems, such as NR. NR can utilize OFDM with a CP on the uplink and downlink and include support for half-duplex operation using TDD. Beamforming can be supported and beam direction can be dynamically configured. MIMO transmissions with precoding can also be supported. A MIMO configuration in the DL can support up to 8 transmit antennas (multi-layer downlink transmission with up to 8 streams) and up to 2 streams per UE. Multi-layer transmissions with up to 2 streams per UE can be supported. Aggregation of multiple cells can be supported with up to 8 serving cells.

[0060] In some examples, access to an air interface can be scheduled. A scheduling entity (e.g., a BS) allocates resources for communication among some or all devices and equipment within its service area or cell. The scheduling entity can be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities to use. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity. Base stations are not the only entities that can function as a scheduling entity. In some examples, a UE can function as a scheduling entity and can schedule resources for one or more subordinate entities, such as one or more other UEs, and the other UEs can utilize the resources scheduled by the UE. In some examples, a UE can act as a scheduling entity in a peer-to-peer (P2P) network and / or in a mesh network. In a mesh networking example, UEs can communicate directly with one another in addition to communicating with a scheduling entity.

[0061] In FIG. 1 , solid lines with double arrows indicate desired transmissions between a UE and a serving BS, which is a BS selected by the UE to serve the UE on the downlink and / or uplink. A fine dashed line with double arrows indicates transmissions between a UE and a BS, which can cause interference to the desired transmission between the UE and the serving BS.

[0062] FIG. 2 An example logical architecture of a distributed radio access network (RAN) 200 is illustrated, which can be implemented in the wireless communication network 100 illustrated in FIG. 1 . The 5G access node 206 can include an access node controller (ANC) 202. The ANC 202 can be a central unit (CU) for the distributed RAN 200. The backhaul interface to the next generation core network (NG-CN) 204 can terminate at the ANC 202. The backhaul interface to neighboring next generation access nodes (NG-ANs) 210 can terminate at the ANC 202. The ANC 202 can include one or more TRPs 208 (e.g., cells, BSs, gNBs, etc.).

[0063] The TRPs 208 can be a distributed unit (DU). The TRPs 208 can be connected to a single ANC (e.g., the ANC 202) or more than one ANC (not illustrated). For example, for RAN sharing, radio as a service (RaaS), and service specific AND deployments, the TRP 208 can be connected to more than one ANC. The TRPs 208 can each include one or more antenna ports. The TRPs 208 can be configured to individually (e.g., dynamic selection) or jointly (e.g., joint transmission) serve traffic to a UE.

[0064] The logical architecture of the distributed RAN 200 can support fronthaul schemes across different deployment

[0065] The logical architecture of the distributed RAN 200 can share features and / or components with LTE. For example, the next generation access node (NG-AN) 210 can support dual connectivity with NR and can share a common fronthaul for LTE and NR.

[0066] The logical architecture of the distributed RAN 200 can enable cooperation between and among TRPs 208, for example, within a TRP and / or across TRPs via the ANC 202. An inter-TRP interface can not be used.

[0067] Logical functions can be dynamically distributed within the logical architecture of the distributed RAN 200. The Radio Resource Control (RRC) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, Media Access Control (MAC) layer, and Physical (PHY) layer can be adaptively placed at the DU (e.g., TRP 208) or CU (e.g., ANC 202).

[0068] FIG. 3 The explanation (e.g.) FIG. 1 The example components of BS 110a and UE 120a and / or 120b (described herein) can be used to implement various aspects of this disclosure. For example, antenna 352, processors 366, 358, 364, and / or controller / processor 380 of UE 120a and / or UE 120b can be used to perform the functions described herein. FIG. 6 , 8 The various techniques and methods described in and / or 14. Similarly, the antenna 334, processors 320, 338, 330, and / or controller / processor 340 of BS 110a can be used to perform the various techniques and methods described herein.

[0069] At BS 110a, the transmit processor 320 can receive data from the data source 312 and control information from the controller / processor 340. This control information can be used for the Physical Broadcast Channel (PBCH), Physical Control Format Indicator Channel (PCFICH), Physical Hybrid ARQ Indicator Channel (PHICH), Physical Downlink Control Channel (PDCCH), Group Shared PDCCH (GC PDCCH), etc. This data can be used for the Physical Downlink Shared Channel (PDSCH), etc. The processor 320 can process (e.g., encoding and symbol mapping) the data and control information to obtain data symbols and control symbols, respectively. The processor 320 can also generate reference symbols (e.g., primary synchronization signal (PSS), secondary synchronization signal (SSS), and cell-specific reference signal (CRS). The transmit (TX) multiple-input multiple-output (MIMO) processor 330 can perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, and / or reference symbols where applicable, and can provide the output symbol stream to modulators (MODs) 332a to 332t. Each modulator 332 can process its respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator can further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The downlink signal from modulators 332a to 332t can be transmitted via antennas 334a to 334t, respectively.

[0070] At the UE 120a (and / or 120b), the antennas 352a-352r can receive the downlink signals from the BS 110a and can provide received signals to the demodulators (DEMODs) 354a-354r, respectively, within transceivers. Each demodulator 354 can condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator can further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 356 can obtain received symbols from all the demodulators 354a through 354r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 358 can process (e.g., demodulate, deinterleave, and decode) the detected symbols, providing decoded data for the UE 120a (or 120b) to a data sink 360, and provide decoded control information to a controller / processor 380.

[0071] On the uplink, at the UE 120a (and / or 120b), a transmit processor 364 can receive and process data (e.g., for the physical uplink shared channel (PUSCH)) from a data source 362 and control information (e.g., for the physical uplink control channel (PUCCH)) from the controller / processor 380. The transmit processor 364 can also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS)). The symbols from the transmit processor 364 can be precoded by a TX MIMO processor 366 if applicable, further processed by the modulators 354a through 354r in transceivers, and transmitted to the BS 110a. At the BS 110a, the uplink signals from the UE 120a (and / or 120b) can be received by the antennas 334, processed by the modulators 332, detected by a MIMO detector 336 if applicable, and further processed by a receive processor 338 to obtain decoded data and control information sent by the UE 120a (and / or 120b). The receive processor 338 can provide the decoded data to a data sink 339 and the decoded control information to the controller / processor 340.

[0072] The controller / processors 340 and 380 can direct the operation at the BS 110a and the UE 120a (and / or 120b), respectively. The processor 340 and / or other processors and modules at the BS 110a can perform or direct the execution of processes for the techniques described herein. The FIG. 2 As shown in FIG. 3D, the controller / processor 380 of the UE 120a (and / or 120b) has a channel selection manager 381, which can be configured to perform various processes for the techniques described herein. FIG. 6 , 8operations of FIG. 14. Although illustrated as being performed at the controller / processor 380 and the controller / processor 340, other components of the UE 120a (and / or 120b) and the BS 110a can be used to perform the operations described herein. The memories 342 and 382 can store data and program codes for the BS 110a and the UE 120a (and / or 120b), respectively. The scheduler 344 can schedule UEs for data transmission on the downlink, sidelink, and / or uplink.

[0073] In some cases, two or more subordinate entities (e.g., UEs) can communicate with each other using sidelink signals. Real-world applications of such sidelink communications can include public safety, proximity services, UE-to-network relaying, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical mesh, and / or various other suitable applications. Generally, a sidelink signal can refer to a signal communicated from one subordinate entity (e.g., UE1) to another subordinate entity (e.g., UE2) without relaying that communication through the scheduling entity (e.g., UE or BS), even though the scheduling entity can be utilized for scheduling and / or control purposes. In some examples, the sidelink signals can be communicated using a licensed spectrum (unlike a wireless local area network (WLAN), which can use an unlicensed spectrum).

[0074] FIG. 4A and FIG. 4B An illustrative representation of an example vehicle-to-everything (V2X) system is shown in accordance with some aspects of the disclosure. For example, FIG. 4A and FIG. 4B The vehicles shown in FIGS. 1-3 can communicate via sidelink channels and can relay sidelink transmissions as described herein.

[0075] FIG. 4A and FIG. 4B The V2X system provided in FIG. 4 provides two complementary modes of transmission. In FIG. 4A A first mode of transmission (also referred to as Mode 4) shown by example in FIG. 5 involves direct communication (e.g., also referred to as sidelink communication) between participants that are proximate to each other in a local area. In FIG. 4B A second mode of transmission (also referred to as Mode 3) shown by example in FIG. 6 involves network communication through a network, which can be implemented through a Uu interface (e.g., a wireless communication interface between a radio access network (RAN) and a UE).

[0076] Referring to FIG. 4AThe V2X system 400 (e.g., including vehicle-to-vehicle (V2V) communications) is illustrated with two vehicles 402, 404. The first mode of transmission allows for direct communication between different participants in a given geographic location. As illustrated, a vehicle can have a wireless communication link 406 (V2P) with an individual (e.g., via a UE) over a PC5 interface. Communication between vehicles 402 and 404 can also occur over a PC5 interface 408. Communication from a vehicle 402 to other highway components (e.g., highway component 410, such as a traffic signal or sign) (V2I) can occur in a similar manner over a PC5 interface 412. For FIG. 4A For each communication illustrated in FIG. 4, bi-directional communication can occur between elements, and thus each element can be a transmitter and a receiver of information. The V2X system 400 can be a self-managed system implemented without network entity assistance. Self-managed systems can enable improved spectral efficiency, reduced cost, and increased reliability because network service interruptions do not occur during handover operations for moving vehicles. The V2X system can be configured to operate in a licensed or unlicensed spectrum, whereby any vehicle with an equipped system can access a common frequency and share information. Such coordinated / common spectrum operation allows for safe and reliable operation. Unlicensed spectrum refers to any frequency band(s) that is not subject to licensed use under regulatory practice, such that the frequency band(s) is open for use by any device (not just devices with a license to use the particular frequency band(s)).

[0077] FIG. 4B A V2X system 450 is shown for communication between vehicles 452 and 454 through a network entity 456. These network communications can occur through discrete nodes, such as BSs (e.g., BS 110a), that transmit information to and receive information from vehicles 452 and 454 (e.g., relay information between vehicles 452 and 454). Network communications over vehicle-to-network (V2N) links 458 and 460 can be used, for example, for long-range communications between vehicles, such as for conveying that there is a traffic accident at some distance ahead along a road or highway. Other types of communications can be sent by wireless nodes to vehicles, such as traffic flow conditions, road hazard warnings, environmental / weather reports, and service station availability, among others. Such data can be obtained from cloud-based sharing services.

[0078] Roadside units (RSUs) can be utilized. RSUs can be used for V2I communications. In some examples, RSUs can act as forwarding nodes to extend coverage for UEs. In some examples, RSUs can be co-located with a BS or can be standalone. RSUs can have different classifications. For example, RSUs can be classified as UE-type RSUs and micro-node-type RSUs. Micro-node-type RSUs have similar functionality as a macro eNB or gNB. Micro-node-type RSUs can utilize a Uu interface. UE-type RSUs can be used to meet stringent quality of service (QoS) requirements by minimizing collisions and improving reliability. UE-type RSUs can use a centralized resource allocation mechanism to allow efficient resource utilization. Critical information (e.g., such as traffic conditions, weather conditions, congestion statistics, sensor data, etc.) can be broadcast to UEs in the coverage area. Relays can rebroadcast critical information received from some UEs. UE-type RSUs can be reliable synchronization sources.

[0079] FIG. 5 is a diagram illustrating an example network 500 of multiple CV2X devices operating in an unlicensed spectrum. The unlicensed spectrum can be an example of a sidelink frequency channel. Further, the network 500 can be an example of a sidelink communication system. The CV2X devices 502 can be configured to communicate on the sidelink frequency channel, as discussed herein. For example, any of the CV2X devices 502 can communicate with any other of the CV2X devices 502.

[0080] In the illustrated example, seven CV2X devices (e.g., a first CV2X device 502a, a second CV2X device 502b, a third CV2X device 502c, a fourth CV2X device 502d, a fifth CV2X device 502e, a sixth CV2X device 502f, and a seventh CV2X device 502g— collectively referred to as CV2X devices 502) can operate in an unlicensed spectrum with other non-CV2X devices (e.g., non-CV2X devices 504a-c— collectively referred to as non-CV2X devices 504). In some examples, the first CV2X device 502a, the sixth CV2X device 502f, and the third CV2X device 502c can be part of a caravan or a platoon. In transportation, platooning or group driving is a method for driving groups of vehicles together. This means increasing road capacity via automated highway systems. Platooning reduces the distance between cars or trucks, such as based on sidelink communications.

[0081] While the examples provided illustrate six car CV2X devices and a drone or other aerial vehicle CV2X device in a traffic setting, it can be appreciated that CV2X devices and environments can extend beyond these and include other wireless communication devices and environments. For example, CV2X device 502 can include a UE (e.g., UE 120) and / or a road side unit (RSU) operated by a highway authority, and can be a device implemented on a motorcycle or carried by a user (e.g., a pedestrian, a cyclist, etc.), or can be implemented on another aerial vehicle such as a helicopter. FIG. 1

[0082] CV2X device 502 can include a UE (e.g., UE 120) of FIG. 1, and can be a device implemented on a motor vehicle such as a car, a motorcycle, etc., or carried by a user (e.g., a pedestrian, a cyclist, etc.), or implemented as a road side unit. FIG. 1

[0083] Various sidelink channels can be used for sidelink communications, including a physical sidelink discovery channel (PSDCH), a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), and a physical sidelink feedback channel (PSFCH). The PSDCH can carry discovery expressions that enable proximate devices to discover one another. The PSCCH can carry control signaling such as sidelink resource configuration and other parameters for data transmission, while the PSSCH can carry data transmission.

[0084] For operation with respect to PSSCH, a UE can perform transmission or reception in a slot on a carrier. Within a period of a slot, reservation or allocation of transmission resources for sidelink transmission can be made on sub-channels of a frequency band. NR sidelink can provide support for UEs for a case where all symbols in a slot are available for sidelink and another case where only a subset of contiguous symbols in a slot are available for sidelink.

[0085] The PSFCH can carry feedback such as channel state information (CSI) related to sidelink channel quality. A sequence-based PSFCH format with one symbol (excluding AGC training period) can be supported. The following formats are possible: a PUCCH Format 2 based PSFCH format, and a PSFCH format spanning all symbols available for sidelink in a slot.

[0086] Example carrier selection in a distributed dual-band CA system

[0087] ​​Certain wireless systems can be designed to operate on certain frequency bands. For example, Long Term Evolution (LTE) Vehicle-to-Everything (V2X) can target the licensed 5.9 GHz band (e.g., Band B47) with an allocated bandwidth of 20 MHz. Spectrum scarcity for some systems can lead to considering unlicensed bands. For example, New Radio (NR) V2X (e.g., in the U.S. market) has prompted exploration of the possibility of deploying NR V2X in unlicensed bands.

[0088] In some cases, it can be beneficial to deploy a dual connectivity system that can enjoy the best of both worlds: the reliability of licensed bands, and the availability of large spectrum in unlicensed bands (along with enhancements to NR V2X design).

[0089] In deployments in unlicensed bands, carrier selection can play a central role in successful coexistence with other technologies. For example, both Licensed Assisted Access (LAA) and NR Unlicensed (NRU) deployments rely on carrier selection to avoid certain channels (such as wireless local area network (WLAN) active-busy channels) to minimize mutual interference.

[0090] However, in LAA and NRU, carrier selection can be performed by a base station (BS) based on channel sensing. As a result, all UEs are tuned to the channel by searching for a BS synchronization signal block (SSB) once and then staying on the selected channel.

[0091] However, in a distributed system, channel sensing is done independently by each UE. As such, the result is not the same for all UEs, as different UEs can individually select different channels. However, aspects of the present disclosure provide a mechanism that allows all UEs within a certain range (e.g., in close proximity to each other (e.g., as defined by a given range or threshold distance, which can be inferred by a zone ID)) to camp on the same channel and be able to communicate with each other.

[0092] FIG. 6 Example operations 600 for wireless communication by a UE, in accordance with certain aspects of the present disclosure, are illustrated. The operations 600 can be performed, for example, by a V-UE (e.g., implemented as a vehicle 502 or 504 of FIG. 1, a UE 120 of FIG. 2, and / or a UE 120 of FIG. 4) to efficiently coordinate a channel for communicating with other V-UEs. FIG. 1 FIG. 5

[0093] ​​The operations 600 begin, at 602, by selecting at least a first channel within an unlicensed band for communicating with at least a second UE. In some cases, the UE monitors the unlicensed (frequency) band, and the selection of the first channel can be based on such monitoring. At 604, the UE transmits, on a licensed band, an indication of the first channel and location information regarding the selection. In some cases, the transmission of the indication of the first channel and the location information can be considered an “advertisement” of such information.

[0094] In this way, a UE can select a preferred channel in the unlicensed band for communication (e.g., the best channel from the UE’s perspective based on a channel quality metric) and advertise the channel selection on a licensed (e.g., LTE V2X) carrier. In some cases, the channel selection algorithm can be designed as a “best effort procedure” that can result in all or most UEs using the same channel in the unlicensed band that are in close proximity to each other (e.g., within a given range as indicated by a zone ID included in a sidelink transmission by them). The channel selection algorithm can be designed to facilitate broadcast / multicast communication between V-UEs within / adjacent to a given range, and allow for a simplified implementation.

[0095] Depending on the UE implementation, the algorithm can still work correctly even if not all devices use the same unlicensed channel. This can be implemented because the channel number (which indicates the selected channel) advertised over the licensed band (e.g., LTE) can still be used to tune to a particular unlicensed channel to use that particular channel to communicate with a group of UEs (e.g., 2 or more UEs).

[0096] The techniques described herein, in which a UE advertises a selected carrier (or channel) selection for the benefit of other UEs, can be considered a form of distributed channel selection. One potential purpose of such distributed carrier (channel) selection as proposed herein can be to implement location-dependent channel selection (e.g., based on local interference patterns and WLAN deployments) for a group of UEs within a given range.

[0097] In a distributed synchronized system, certain synchronized sources (e.g., GPS-synchronized sources) are given higher priority. Aspects of the disclosure can give certain V-UEs, such as stationary nodes (e.g., RSUs), higher priority in the carrier selection process. Such a preference can be given, for example, because RSUs, by definition, typically remain in a given location and provide a fixed reference point for channel conditions.

[0098] FIG. 7 One example of a channel selection algorithm 700 according to the disclosure is illustrated. In some cases, the channel selection algorithm 700 can be implemented by a V-UE performing the operations 600 of FIG. 6 .

[0099] The algorithm can be performed at each UE (V-UE / RSU) as each UE periodically monitors the unlicensed band for a "clean" channel (e.g., with minimal interference at the current location) to be used for (e.g., NR) V2X transmission / reception (TX / RX) operation on the unlicensed band, while concurrently performing (e.g., LTE) V2X operation on the licensed band. In this context, concurrent operation does not necessarily mean simultaneous communication, but can refer to overlapping or interleaved communication in the licensed band (e.g., LTE V2X) and the unlicensed band (e.g., NR V2X).

[0100] On the licensed frequency (e.g., LTE carrier), each NR V2X device can periodically transmit a secondary carrier information field (SCIF), which in one example can carry the following information:

[0101] channel_number: "clean" channel number (identifying the channel on the unlicensed carrier in which the UE transmits / receives);

[0102] is RSU field: specifying whether the device (transmitting the SCIF) is a stationary / RSU device; and

[0103] SZID: selected zone identifier (ID) (corresponding to a geographical location) in which the carrier selection is made.

[0104] The is RSU field can be used to indicate that the SCIF is sent by an RSU (e.g., is RSU = 1), allowing prioritization of channel selection by RSUs, as a (stationary) RSU can operate over a relatively long period of time to monitor the unlicensed channel.

[0105] Referring to FIG. 7 At any given time, a UE maintains a current state, which is defined as: {channel_number, is RSU, SZID}, indicating the channel currently used, whether the channel is selected by an RSU, and where the channel is selected (e.g., the zone in which the V-UE / RSU selecting the channel was located at the time of selection). This location information can help the UE decide whether it is within a given range and thus whether it is reasonable to use the corresponding advertised channel.

[0106] As shown in channel selection algorithm 700, for any SCIF received at 710, the UE determines at 720 whether the SCIF was sent by an RSU. If the SCIF was sent by an RSU, the UE checks at 730 to see if the current state channel selection was also obtained from a SCIF sent by an RSU. If so, at 750, the UE uses the most recent RSU to select the channel (e.g., as determined by the current state and SCIF zone ID). If the current channel selection was not obtained from a SCIF from an RSU, and the current SCIF is from an RSU, then the UE adopts the SCIF as the new state at 740, e.g., so long as the SCIF RSU is within a certain (e.g., preconfigured) range.

[0107] Referring back to 720, if the current SCIF (which was received at 710) was sent by a non-RSU (e.g., a mobile V-UE), then the UE determines at 760 whether the current channel selection was from an RSU. If so, at 780, the UE adopts the SCIF as the new state only if the current state RSU is out of range (e.g., the V-UE has traveled at least a threshold distance away from the zone ID of the current SCIF state). If the current state selection was not from an RSU, then at 770, the UE adopts the state of the received SCIF as the new state if the SZID of the received SCIF (e.g., scif.SZID) is closer to the current location than the current SZID (e.g., state.SZID). If the zone IDs are the same, the UE can employ some form of tie-breaking (e.g., using the higher frequency channel).

[0108] If no SCIFs within the configured range are received from other UEs over the configured period of time, the UE can go through a carrier selection procedure (e.g., scan the unlicensed band) to pick the best channel and transmit its own SCIF containing {channel_number, is_rsu = 0, SZID} (e.g., where SZID is the zone ID in which the selection was made).

[0109] FIG. 8 Example operations 800 for wireless communications by a UE, in accordance with certain aspects of the present disclosure, are illustrated. The operations 800 can be performed, for example, by a V-UE (e.g., implemented as a vehicle 502 or 504 of FIG. 4, and / or a UE 120 of FIG. 1, implemented to efficiently coordinate channels for communications with other V-UEs, such as a V-UE performing operations 600 of FIG. 6. FIG. 1 or a UE 120 of FIG. 4, and / or implemented as a vehicle 502 or 504 of FIG. 5 FIG. 5, to efficiently coordinate channels for communications with other V-UEs, such as a V-UE performing operations 600 of FIG. 6. FIG. 6

[0110] ​Operation 800 begins at 802, where the second UE receives an indication of a first channel for communication with the second UE in an unlicensed frequency band on a licensed frequency band. At 804, the UE transmits an indication of a preferred channel and location information about the preferred channel on the licensed frequency band, wherein the preferred channel includes either the first channel or the second channel.

[0111] FIG. 9A-9C , FIG. 10A-10B and FIG. 11A-11B The various scenarios for practical applications of the algorithms described above are explained.

[0112] FIG. 9A-9C The scenario described involves two cars (A and B) crossing an intersection with an RSU (on lane 5 and with an SZID of 0). FIG. 9A First, an example of two cars (e.g., V-UEs) outside the range of the RSU is explained. In other words, these two cars, A and B, are outside the boundary of zone 0, as shown in the figure. Furthermore, these two cars, A and B, have selected different channels in the unlicensed frequency band at different locations. That is, car A selects channel 3 with an SZID of 13, while car B selects channel 15 with an SZID of 25. For example... FIG. 9B As explained in the text, since cars A and B enter the RSU range (within the zone 0 boundary), the RSU channel and SZID are adopted (e.g., CH=5 and SZID=0).

[0113] like FIG. 9C As explained, since cars A and B have traveled outside the zone 0 boundary of the RSU (or the RSU has been lost / disconnected for other reasons), cars A and B can perform reselection or handover to channels advertised by other UEs (not shown). In the illustrated example, cars A and B switch to CH=5 / SZID=9 and CH=4 / SZID=7, respectively.

[0114] FIG. 10A-10B The text describes another scenario where car A moves from one RSU (zone 0 boundary) to another RSU (while car B remains within RSU zone 1 boundary). FIG. 10A In the middle, car A is closest to the first RSU (RSU 0) and therefore uses the SCIF of that RSU (e.g., as...). FIG. 9A-9C In the case of CH=5 and SZID=0). Similarly, car B is closest to the second RSU (RSU 1) and therefore uses the SCIF of that RSU (e.g., CH=4 and SZID=1). As explained, in FIG. 10B As car A moves closer to the second RSU (RSU 1), car A updates its SCIF state to the SCIF state advertised by the new / closer RSU 1 (e.g., CH=4 and SZID=1).

[0115] FIG. 11A and 11B How UE channel selection can merge when there are no RSUs in range is illustrated. As FIG. 11A illustrated in FIG. 6, two cars A and B are coming towards each other, each with a different channel and a different SZID (e.g., car A has CH = 5 and SZID = 123, while car B has CH = 4 and SZID = 241).

[0116] As illustrated in FIG. 7, when the cars meet (e.g., come within range of each other), the UE can apply the criterion of which SZID is closer in distance to the current zone ID. In other words, the car that made the channel selection at a point further away (further from the current location) can abandon its selection and adopt the channel of the other car (because that channel selection was made closer to the current location). In the illustrated example, the current zone ID is 200 (which is closer to 241 than 123), so car A, which previously had CH = 5 and SZID = 123, switches to CH = 4 and SZID = 241. FIG. 11B While the above-described example involved 2 cars, the distributed channel selection described herein can be extended to scenarios involving more than 2 cars (as shown in

[0117] FIG. 8). In such cases, each car within range can receive advertisements from one or more other UEs (and / or advertise its own channel selection), and perform the channel selection algorithm accordingly. In this way, a group including more than 2 UEs can be able to camp on a common channel for V2X communications. FIG. 5 Example communication device

[0118]

[0119] A communication device 1200 including various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated in FIG. 12 FIG. 9, is illustrated. The communication device 1200 includes a processing system 1202 coupled to a transceiver 1208. The transceiver 1208 is configured to transmit and receive signals (such as the various signals described herein) for the communication device 1200 via an antenna 1210. The processing system 1202 can be configured to perform processing functions for the communication device 1200, including processing signals received by and / or to be transmitted by the communication device 1200. FIG. 6

[0120] ​Processing system 1202 includes processor 1204 coupled to computer-readable medium / memory 1212 via bus 1206. In some aspects, computer-readable medium / memory 1212 is configured to store data that, when executed by processor 1204, causes processor 1204 to execute. FIG. 6 The operations described herein, or instructions (e.g., computer-executable code) for efficiently coordinating channels to communicate with other V-UEs. In some aspects, the computer-readable medium / memory 1212 stores code 1214 for selecting at least a first channel within an unlicensed frequency band for communication with at least a second UE, and code 1216 for transmitting an indication of the first channel and location information regarding the selection on a licensed frequency band. In some aspects, the processor 1204 has circuitry configured to implement the code stored in the computer-readable medium / memory 1212. The processor 1204 includes circuitry 1218 for selecting at least a first channel within an unlicensed frequency band for communication with at least a second UE, and circuitry 1220 for transmitting an indication of the first channel and location information regarding the selection on a licensed frequency band.

[0121] FIG. 13 The description may include operations that are configured to perform the techniques disclosed herein (such as, FIG. 8 The communication device 1300 comprises various components (e.g., corresponding to device plus functional components) of the operation described herein. The communication device 1300 includes a processing system 1302 coupled to a transceiver 1308. The transceiver 1308 is configured to transmit and receive signals (such as the various signals described herein) for the communication device 1300 via an antenna 1310. The processing system 1302 may be configured to perform processing functions for the communication device 1300, including processing signals received and / or to be transmitted by the communication device 1300.

[0122] Processing system 1302 includes processor 1304 coupled to computer-readable medium / memory 1312 via bus 1306. In some aspects, computer-readable medium / memory 1312 is configured to store data that, when executed by processor 1304, causes processor 1304 to execute. FIG. 8The memory 1312 includes computer readable instructions (e.g., computer-executable code) that, when executed by the processor 1304, perform operations as discussed herein or otherwise with respect to the various techniques for channel measurement as discussed herein. In certain aspects, the computer readable instructions include code 1314 for receiving, from a second UE on a licensed band, a first indication of a first channel within an unlicensed band for communications with the second UE, and code 1316 for transmitting, on the licensed band, an indication of a preferred channel and location information for the preferred channel, where the preferred channel includes the first channel or a second channel. In certain aspects, the processor 1304 has circuitry configured to implement the code stored in the computer readable medium / memory 1312. The processor 1304 includes circuitry 1318 for receiving, from a second UE on a licensed band, a first indication of a first channel within an unlicensed band for communications with the second UE, and circuitry 1320 for transmitting, on the licensed band, an indication of a preferred channel and location information for the preferred channel, where the preferred channel includes the first channel or a second channel.

[0123] Example methods

[0124] FIG. 14 Example operations 1400 for wireless communications by a UE, in accordance with certain aspects of the present disclosure, are illustrated. The operations 1400 can be performed, for example, by the UE 120 of FIG. 1 or FIG. 4 when performing link measurement communications. FIG. 1 or the UE 120 of FIG. 4 when performing link measurement communications.

[0125] The operations 1400 begin, at 1402, by monitoring an unlicensed band. At 1404, the UE selects, based on the monitoring, at least a first channel within the unlicensed band for communications with at least a second UE. At 1406, the UE advertises, on a licensed band, the first channel and location information regarding the selection.

[0126] Example aspects

[0127] Aspect 1 : A method for wireless communications by a first user equipment (UE), comprising: selecting at least a first channel within an unlicensed band for communications with at least a second UE, and transmitting, on a licensed band, an indication of the first channel and location information regarding the selection.

[0128] Aspect 2: The method of aspect 1, wherein the transmitting comprises periodically transmitting the indication of the first channel and the location information in a secondary carrier information field (SCIF).

[0129] Aspect 3: The method of aspect 2, wherein the SCIF comprises: a channel number identifying the first channel; a field indicating whether the first UE is a stationary device; and a selected zone ID as the location information, the selected zone ID indicating a zone ID in which the first channel is selected as the location information.

[0130] Aspect 4: The method of aspect 3, further comprising: receiving at least one SCIF from at least a second UE on the licensed band, and communicating with the second UE via: a first channel selected by the first UE; or a second channel indicated in the SCIF received from the second UE.

[0131] Aspect 5: The method of aspect 4, wherein communicating with the second UE via the first channel or the second channel is based at least in part on: whether the received SCIF indicates that the second UE is a stationary unit; and a selected zone ID in the SCIF received from the second UE.

[0132] Aspect 6: The method of aspect 5, wherein communicating via the first channel or the second channel comprises: communicating via the second channel if the SCIF received from the second UE indicates that the second UE is a stationary unit and the selected zone ID in the SCIF received from the second UE is within the configured range.

[0133] Aspect 7: The method of aspect 6, further comprising: receiving SCIFs from other stationary unit UEs having a selected zone ID within the configured range, and selecting a channel indicated in the SCIF received from the closest stationary unit UE.

[0134] Aspect 8: The method of any of aspects 5-7, wherein the first UE communicates via the second channel indicated in the SCIF received from the second UE only if the zone ID in the SCIF received from the second UE indicates that the second UE is within the configured range.

[0135] Aspect 9: The method of aspect 8, further comprising: receiving SCIFs from other UEs within the configured range, and selecting a channel indicated in the SCIF of these SCIFs having the highest frequency channel.

[0136] Aspect 10: The method of any of aspects 4-9, wherein if the second UE is not a stationary unit, communicating with the second UE via the first channel or the second channel comprises: communicating with the second UE via the first channel if a selected zone ID in the SCIF transmitted by the first UE is closer in distance to a current zone ID than a selected zone ID in the SCIF received from the second UE; or communicating with the second UE via the second channel if the selected zone ID in the SCIF received from the second UE is closer in distance to the current zone ID than the selected zone ID in the SCIF transmitted by the first UE.

[0137] Aspect 11: A method for wireless communications by a first UE, comprising: receiving, from a second UE, a first indication of a first channel within an unlicensed band for communications with the second UE on a licensed band, and transmitting, on the licensed band, an indication of a preferred channel and location information for the preferred channel, wherein the preferred channel comprises the first channel or a second channel.

[0138] Aspect 12: The method of aspect 11, wherein the receiving comprises periodically receiving the indication of the first channel and the location information in a SCIF.

[0139] Aspect 13: The method of aspect 12, wherein the SCIF comprises: a channel number identifying the first channel; a field indicating whether the first UE is a stationary device; and a selected zone ID as the location information, the selected zone ID indicating a zone ID of the first channel as the location information.

[0140] Aspect 14: The method of aspect 13, wherein the transmitting the indication of the preferred channel comprises transmitting at least one SCIF to at least the second UE on the licensed band, and the method further comprises communicating with the second UE via: the first channel, or a second channel indicated in the SCIF transmitted to the second UE.

[0141] Aspect 15: The method of aspect 14, wherein the communicating with the second UE via the first channel or the second channel is based at least in part on: whether the transmitted SCIF indicates that the first UE is a stationary unit; and a selected zone ID in the SCIF transmitted to the second UE.

[0142] Aspect 16: The method of aspect 15, wherein the communicating with the second UE via the first channel or the second channel comprises: communicating via the second channel if the SCIF transmitted to the second UE indicates that the first UE is a stationary unit and the selected zone ID in the SCIF transmitted to the second UE is within a configured range.

[0143] Aspect 17: The method of aspect 15 or 16, wherein the first UE communicates via the second channel indicated in the SCIF transmitted to the second UE only if a zone ID in the SCIF transmitted to the second UE indicates that the second UE is within a configured range.

[0144] Aspect 18: The method of any of aspects 14-17, wherein, if the first UE is not a stationary unit, communicating with the second UE via the first channel or the second channel comprises: communicating via the first channel if a selected zone ID in the SCIF received from the second UE is closer in distance to the current zone ID than a selected zone ID in the SCIF transmitted to the second UE; or communicating via the second channel if the selected zone ID in the SCIF transmitted to the second UE is closer in distance to the current zone ID than the selected zone ID in the SCIF received from the first UE.

[0145] Aspect 19: A method of wireless communication by a first user equipment (UE), comprising: monitoring an unlicensed band; selecting, based on the monitoring, at least a first channel within the unlicensed band for communicating with at least a second UE; and advertising the first channel and location information about the selection on a licensed band.

[0146] Aspect 20: The method of aspect 19, wherein the advertising comprises periodically transmitting an indication of the first channel and the location information in a secondary carrier information field (SCIF).

[0147] Aspect 21 : The method of aspect 20, wherein the SCIF comprises: a channel number identifying the first channel; a field indicating whether the first UE is a stationary device; and a selected zone ID as the location information, the selected zone ID indicating a zone ID in which the first channel is selected as the location information.

[0148] Aspect 22: The method of aspect 21, further comprising: receiving at least one SCIF from the at least second UE on the licensed band; and deciding whether to use the first channel selected by the first UE or a second channel indicated in the SCIF received from the second UE to communicate with the second UE.

[0149] Aspect 23: The method of aspect 22, wherein the deciding is based at least in part on: whether the received SCIF indicates that the second UE is a stationary unit; and a selected zone ID in the SCIF received from the second UE.

[0150] Aspect 24: The method of aspect 23, wherein the deciding whether to use the first channel or the second channel comprises: deciding to use the second channel if the SCIF received from the second UE indicates that the second UE is a stationary unit and the selected zone ID in the SCIF received from the second UE is within a configured range.

[0151] Aspect 25: The method of Aspect 24, further comprising: receiving SCIFs from other stationary units, UEs, having selected zone IDs within the configured range; and selecting a channel indicated in the SCIF received from the closest stationary unit, UE.

[0152] Aspect 26: The method of any of Aspects 23-25, wherein deciding whether to use the channel indicated in the SCIF received from the second UE only if the zone ID in the SCIF received from the second UE indicates that the second UE is within the configured range.

[0153] Aspect 27: The method of Aspect 26, further comprising: receiving SCIFs from other UEs within the configured range; and selecting the channel indicated in the SCIF of these SCIFs having the highest frequency channel.

[0154] Aspect 28: The method of any of Aspects 22-27, wherein if the second UE is not a stationary unit, deciding whether to use the first channel or the second channel comprises: deciding to use the first channel if the selected zone ID in the SCIF transmitted by the first UE is closer in distance to the current zone ID than the selected zone ID in the SCIF received from the second UE; or deciding to use the second channel if the selected zone ID in the SCIF received from the second UE is closer in distance to the current zone ID than the selected zone ID in the SCIF transmitted by the first UE.

[0155] Aspect 29: An apparatus for wireless communication, comprising a processor and a memory coupled to the processor, the processor and the memory being configured to perform the method of any of Aspects 1-28.

[0156] Aspect 30: An apparatus for wireless communication, comprising at least one means for performing the method of any of Aspects 1-28.

[0157] Aspect 31: A non-transitory computer-readable medium storing code for wireless communication, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of any of Aspects 1-28.

[0158] Aspect 32: A method of wireless communication by a first user equipment (UE), comprising: monitoring an unlicensed band; selecting, based on the monitoring, at least a first channel within the unlicensed band for communication with at least a second UE; and advertising the first channel and location information regarding the selection on a licensed band.

[0159] Aspect 33: The method of aspect 32, wherein the advertisement includes an indication of the first channel and location information in a secondary carrier information field (SCIF) transmitted periodically.

[0160] Aspect 34: The method of aspect 33, wherein the SCIF includes: a channel number identifying the first channel; a field indicating whether the first UE is a stationary device; and a selected zone ID as the location information, the selected zone ID indicating a zone ID in which the first channel is selected as the location information.

[0161] Aspect 35: The method of any of examples 32 to 34, further comprising: receiving at least one SCIF from at least a second UE on a licensed band; and deciding whether to use the first channel selected by the first UE or a second channel indicated in the SCIF received from the second UE to communicate with the second UE.

[0162] Aspect 36: The method of any of aspects 32 to 35, wherein the deciding is based at least in part on: whether the received SCIF indicates that the second UE is a stationary unit; and a selected zone ID in the SCIF received from the second UE.

[0163] Aspect 37: The method of any of aspects 32 to 36, wherein the deciding whether to use the first channel or the second channel comprises: deciding to use the second channel when the SCIF received from the second UE indicates that the second UE is a stationary unit and the selected zone ID in the SCIF received from the second UE is within the configured range.

[0164] Aspect 38: The method of any of aspects 32 to 37, further comprising: receiving SCIFs from other stationary unit UEs having a selected zone ID within the configured range; and selecting a channel indicated in the SCIF received from the closest stationary unit UE.

[0165] Aspect 39: The method of any of aspects 32 to 38, wherein the deciding whether to use the channel indicated in the SCIF received from the second UE is only if the zone ID in the SCIF received from the second UE indicates that the second UE is within the configured range.

[0166] Aspect 40: The method of any of aspects 32 to 39, further comprising: receiving SCIFs from other UEs within the configured range; and selecting a channel indicated in a SCIF of these SCIFs having a highest frequency channel.

[0167] Aspect 41 : The method of any of aspects 32 through 40, wherein if the second UE is not a stationary unit, deciding whether to use the first channel or the second channel comprises deciding to use the first channel if the selected zone ID in the SCIF transmitted by the first UE is closer in distance to the current zone ID than the selected zone ID in the SCIF received from the second UE, or deciding to use the second channel if the selected zone ID in the SCIF received from the second UE is closer in distance to the current zone ID than the selected zone ID in the SCIF transmitted by the first UE.

[0168] Aspect 42: An apparatus for wireless communication, comprising: a processor; a memory coupled with the processor, the processor and the memory configured to perform the method of any of examples 32 through 41.

[0169] Aspect 43: An apparatus for wireless communication, comprising at least one means for performing the method of any of examples 32 through 41.

[0170] Aspect 44: A non-transitory computer-readable medium storing code for wireless communication, comprising: a processor; a memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of any of aspects 32 through 41.

[0171] The methods disclosed herein comprise one or more steps or actions for achieving the methods. The method steps and / or actions can be interchanged with one another without departing from the scope of the claims. In other words, unless a specific order is specified, the order and / or use of the steps and / or actions can be modified without departing from the scope of the claims.

[0172] As used herein, a phrase referring to “at least one of’ a list of items refers to any combination of those items, including single members. As an example, “at least one of a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination of multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c, or any other ordering of a, b, and c).

[0173] As used herein, the term "determine" encompasses a wide variety of actions. For example, "determine" can include calculation, computation, processing, derivation, research, searching (e.g., looking in a table, database, or other data structure), ascertaining, and the like. Furthermore, "determine" can include receiving (e.g., receiving information), accessing (e.g., accessing data in memory), and the like. Moreover, "determine" can include parsing, selecting, choosing, building, and the like.

[0174] The preceding description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will readily be understood by those skilled in the art, and the universal principles defined herein may be applied to other aspects. Therefore, the claims are not intended to be limited to the aspects shown herein, but are to be granted the full scope consistent with the language of the claims, wherein references to the singular form of an element are not intended to mean “one and only one” (unless specifically stated otherwise) but “one or more.” Unless specifically stated otherwise, the term “some / a” refers to one or more. All structural and functional equivalents of the aspects described throughout this disclosure that are now or hereafter known to a person skilled in the art are expressly incorporated herein by reference and are intended to be covered by the claims. Furthermore, nothing disclosed herein is intended to be donated to the public, whether or not such disclosure is expressly stated in the claims. No element of a claim should be interpreted in accordance with the provisions of 35 U.S.SC §112(f) unless the element is expressly stated using the phrase “means for…” or, in the case of a method claim, the element is stated using the phrase “steps for…”.

[0175] The various operations of the methods described above can be performed by any suitable means capable of performing the corresponding functions. These means may include various hardware and / or software components and / or modules, including but not limited to circuits, application-specific integrated circuits (ASICs), or processors. Generally, where the operations illustrated in the figures are present, these operations may have corresponding paired means plus functional components. For example, FIG. 6 , 8 The various operations shown in and / or 14 can be performed by the various processors shown in Figure 4 for UE120a (and / or 120b) and / or BS 110a.

[0176] The various illustrative logical blocks, modules, and circuits described in connection with the disclosure can be implemented or performed with a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor can be a microprocessor, but in the alternative, the processor can be any commercially available processor, controller, microcontroller, or state machine. A processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0177] If implemented in hardware, an example hardware configuration can include a processing system in a wireless node. The processing system can be implemented with a bus architecture. There can be several buses such as a high-speed bus, a standard bus, a peripheral bus, and a local bus with a bus controller to control the buses. The buses can link various circuits such as a processor, machine-readable medium, and bus interface together. The bus interface can be used to connect the network adapter to the processing system via the bus. The network adapter can be used to implement signal processing functionality of the PHY layer. In the case of UE 120 (see FIG. 1), a user interface (e.g., keypad, display, mouse, joystick, etc.) can also be connected to the bus. The bus can also link various other circuits such as a timing source, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further. The processor can be implemented with one or more general-purpose and / or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuitry that can execute software. Those skilled in the art will recognize how to best implement the functionality described with respect to the processing system depending on the particular application and general purpose for which the overall network or system is intended. FIG. 1 ) can also be connected to the bus. The bus can also link various other circuits such as a timing source, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further. The processor can be implemented with one or more general-purpose and / or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuitry that can execute software. Those skilled in the art will recognize how to best implement the functionality described with respect to the processing system depending on the particular application and general purpose for which the overall network or system is intended.

[0178] If implemented in software, the functions can be stored or transmitted over as one or more instructions or code on a computer-readable medium. Software shall be construed broadly to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. Computer-readable media include both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. The processor can be responsible for managing the bus and general processing, including the execution of software modules stored on the machine-readable storage media. A computer-readable storage medium can be coupled with the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium can be integral with the processor. By way of example, the machine-readable media can include a transmission line, a carrier wave modulated by data, and / or a computer readable storage medium with instructions stored thereon separate from the wireless node, all of which can be accessed via the bus. Alternatively, or in addition, the machine-readable media, or any portion thereof, can be integrated with the processor, such as the case can be with cache and / or general register files. Examples of machine-readable storage media can include, by way of example, RAM (Random Access Memory), flash memory, ROM (Read Only Memory), PROM (Programmable Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), registers, magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof. The machine-readable media can be embodied in a computer-program product.

[0179] A software module can comprise a single instruction, or many instructions, and can be distributed over several different code segments, among different programs, and across multiple storage media. The computer-readable media can comprise a number of software modules. The software modules include instructions that, when executed by an apparatus such as a processor, cause the processing system to perform various functions. The software modules can include a transmission module and a receiving module. Each software module can reside in a single storage device or be distributed across multiple storage devices. By way of example, a software module can be loaded into RAM from a hard drive when a triggering event occurs. During execution of the software module, the processor can load some of the instructions into cache to increase access speed. One or more cache lines can then be loaded into a general register file for execution by the processor. When referring to the functionality of a software module below, it will be understood that such functionality is implemented by the processor when executing instructions from that software module.

[0180] Similarly, any connection is also legitimately referred to as computer-readable medium. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technology (such as infrared (IR), radio, and microwave), then that coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technology (such as infrared, radio, and microwave) is included in the definition of medium. As used herein, disks and discs include compact discs (CDs), laser discs, optical discs, digital multi-purpose discs (DVDs), floppy disks, and... Disks, where disks often magnetically reproduce data, and discs optically reproduce data using lasers. Therefore, in some aspects, computer-readable media may include non-transient computer-readable media (e.g., tangible media). Additionally, in other aspects, computer-readable media may include transient computer-readable media (e.g., signals). Combinations of the above should also be included within the scope of computer-readable media.

[0181] Therefore, certain aspects may include computer program products for performing the operations described herein. For example, such computer program products may include computer-readable media on which instructions are stored (and / or encoded) that can be executed by one or more processors to perform the operations described herein. FIG. 6 , 8 And / or the instructions for the operations explained in 14.

[0182] Furthermore, it should be understood that modules and / or other suitable means for performing the methods and techniques described herein may be downloaded and / or otherwise obtained by the user terminal and / or base station where applicable. For example, such devices can be coupled to a server to facilitate the transfer of means for performing the methods described herein. Alternatively, the various methods described herein can be provided via a storage device (e.g., RAM, ROM, physical storage media such as CDs or floppy disks, etc.) so that the device can obtain the various methods once the storage device is coupled to or provided to the user terminal and / or base station. Furthermore, any other suitable techniques appropriate for providing the methods and techniques described herein to the device may be utilized.

[0183] It will be understood that the claims are not limited to the precise configurations and components described above. Various modifications, substitutions, and variations may be made to the layout, operation, and details of the methods and apparatus described above without departing from the scope of the claims.

Claims

1. A method for wireless communications by a first user equipment (UE), comprising: selecting at least a first channel within an unlicensed band for communication with at least a second UE; transmitting, on a licensed band, an indication of the first channel and location information regarding the selection; receiving, on the licensed band, at least one secondary carrier information field (SCIF) from at least the second UE; and communicating with the second UE via: the first channel selected by the first UE; or a second channel indicated in the SCIF received from at least the second UE; wherein communicating with the second UE via the first channel or the second channel is based at least in part on: whether the SCIF received from the second UE indicates that the second UE is a stationary unit; and a selected zone ID in the SCIF received from the second UE.

2. The method of claim 1, wherein the transmitting comprises periodically transmitting the indication of the first channel and the location information in a SCIF.

3. The method of claim 2, wherein the SCIF transmitted by the first UE comprises: a channel number identifying the first channel; a field indicating whether the first UE is a stationary device; and as the location information, a selected zone ID indicating a zone ID in which the first channel was selected as the location information.

4. The method of claim 1, wherein communicating via the first channel or the second channel comprises: communicating via the second channel when the SCIF received from the second UE indicates that the second UE is a stationary unit and the selected zone ID in the SCIF received from the second UE is within a configured range.

5. The method of claim 4, further comprising: receiving SCIFs from other stationary unit UEs having a selected zone ID within the configured range; and selecting a channel indicated in the SCIF received from a closest stationary unit UE. the first UE communicates via the second channel indicated in the SCIF received from the second UE when the zone ID in the SCIF received from the second UE indicates that the second UE is within a configured range.

7. The method of claim 6, further comprising:

6. The method of claim 1, wherein, receiving SCIFs from other UEs within the configured range; and selecting a channel indicated in one of the SCIFs based on a respective frequency. communicating with the second UE via the first channel or the second channel when the second UE is not a stationary unit comprises: communicating with the second UE via the first channel when a selected zone ID in the SCIF transmitted by the first UE is closer in distance to a current zone ID than a selected zone ID in the SCIF received from the second UE; or communicating with the second UE via the second channel when a selected zone ID in the SCIF transmitted by the first UE is not closer in distance to a current zone ID than a selected zone ID in the SCIF received from the second UE.

8. The method of claim 1, wherein, ​ ​ communicating with the second UE via the second channel when a selected zone ID in the SCIF received from the second UE is closer in distance to a current zone ID than a selected zone ID in the SCIF transmitted by the first UE.

9. A method for wireless communications by a first user equipment (UE), comprising: receiving, from a second UE on a licensed band, an indication of a first channel within an unlicensed band for communications with the second UE; transmitting, on the licensed band, an indication of a preferred channel and location information about the preferred channel, wherein the preferred channel comprises the first channel or a second channel, wherein the transmitting comprises transmitting at least one secondary carrier information field (SCIF) to at least the second UE on the licensed band; and communicating with the second UE via: the first channel; or the second channel indicated in the SCIF transmitted to at least the second UE; wherein communicating with the second UE via the first channel or the second channel is based at least in part on: whether the SCIF transmitted to the second UE indicates that the first UE is a stationary unit; and a selected zone ID in the SCIF transmitted to the second UE.

10. The method of claim 9, wherein the receiving comprises periodically receiving the indication of the first channel and the location information from the second UE in a SCIF.

11. The method of claim 10, wherein the SCIF received by the first UE comprises: a channel number identifying the first channel; a field indicating whether the first UE is a stationary device; and a selected zone ID as the location information, the selected zone ID indicating a zone ID of the first channel as the location information.

12. The method of claim 9, wherein communicating with the second UE via the first channel or the second channel comprises: communicating via the second channel if the SCIF transmitted to the second UE indicates that the first UE is a stationary unit and a selected zone ID in the SCIF transmitted to the second UE is within a configured range.

13. The method of claim 9, wherein the first UE only communicates via the second channel indicated in the SCIF transmitted to the second UE if the zone ID in the SCIF transmitted to the second UE indicates that the second UE is within a configured range.

14. The method of claim 9, wherein, communicating with the second UE via the first channel or the second channel if the first UE is not a stationary unit comprises: communicating via the first channel if a selected zone ID in the SCIF received from the second UE is closer in distance to a current zone ID than a selected zone ID in the SCIF transmitted to the second UE; or communicating via the second channel if a selected zone ID in the SCIF received from the second UE is closer in distance to a current zone ID than a selected zone ID in the SCIF transmitted to the second UE. communicate via the second channel in a case that a selected zone ID in the SCIF transmitted to the second UE is closer in distance to a current zone ID than a selected zone ID in the SCIF received from the first UE.

15. An apparatus for wireless communication by a first user equipment (UE), comprising: a memory; and one or more processors coupled to the memory, the one or more processors configured to cause the apparatus to: select at least a first channel within an unlicensed band for communication with at least a second UE; transmit an indication of the first channel and location information regarding the selection on a licensed band; receive at least one SCIF from at least the second UE on the licensed band; and communicate with the second UE via: the first channel selected by the first UE; or a second channel indicated in the SCIF received from the second UE; wherein communicating with the second UE via the first channel or the second channel is based at least in part on: whether the SCIF received from the second UE indicates that the second UE is a stationary unit; and a selected zone ID in the SCIF received from the second UE.

16. The apparatus of claim 15, wherein the one or more are further configured to cause the apparatus to periodically transmit the indication of the first channel and the location information in a SCIF.

17. The apparatus of claim 16, wherein the SCIF transmitted by the apparatus comprises: a channel number identifying the first channel; a field indicating whether the first UE is a stationary device; and a selected zone ID as the location information, the selected zone ID indicating a zone ID in which the first channel was selected as the location information.

18. The apparatus of claim 15, wherein the one or more processors are further configured to cause the apparatus to communicate via the first channel or the second channel by communicating via the second channel in a case that the SCIF received from the second UE indicates that the second UE is a stationary unit and a selected zone ID in the SCIF received from the second UE is within a configured range.

19. The apparatus of claim 18, wherein the one or more processors are further configured to cause the apparatus to: receive SCIFs from other stationary unit UEs having a selected zone ID within the configured range; and select a channel indicated in a SCIF received from a closest stationary unit UE. the first UE communicates via the second channel indicated in the SCIF received from the second UE when the zone ID in the SCIF received from the second UE indicates that the second UE is within a configured range.

20. The apparatus of claim 15, wherein, 21. The apparatus of claim 20, wherein the one or more processors are further configured to cause the apparatus to: ​ receive SCIFs from other UEs within the configured range; and select a channel indicated in one of the SCIFs based on a corresponding frequency.

22. The apparatus of claim 15, wherein, when the selected zone ID in the SCIF transmitted by the first UE is closer in distance to a current zone ID than the selected zone ID in the SCIF received from the second UE, communicate with the second UE via the first channel; or when the selected zone ID in the SCIF received from the second UE is closer in distance to a current zone ID than the selected zone ID in the SCIF transmitted by the first UE, communicate with the second UE via the second channel.

23. An apparatus for wireless communication by a first user equipment (UE), comprising: a memory; and one or more processors coupled to the memory, the one or more processors configured to cause the apparatus to: receive, from a second UE on a licensed band, an indication of a first channel within an unlicensed band for communication with the second UE; transmit, on the licensed band, an indication of a preferred channel and location information about the preferred channel, wherein the preferred channel comprises the first channel or a second channel, wherein to transmit the indication and the location information, the one or more processors are configured to cause the apparatus to transmit at least one secondary carrier information field (SCIF) to at least the second UE on the licensed band; and communicate with the second UE via: the first channel; or the second channel indicated in the SCIF transmitted to at least the second UE; wherein communicating with the second UE via the first channel or the second channel is based at least in part on: whether the SCIF transmitted to the second UE indicates that the first UE is a stationary unit; and a selected zone ID in the SCIF transmitted to the second UE.

24. The apparatus of claim 23, wherein the one or more processors are further configured to cause the apparatus to receive the indication of the first channel by periodically receiving the indication of the first channel and the location information in a SCIF.

25. The apparatus of claim 24, wherein the SCIF received by the apparatus comprises: a channel number that identifies the first channel; a field that indicates whether the first UE is a stationary device; and as the location information, a selected zone ID that indicates a zone ID of the first channel as the location information. ​ ​ 26. The apparatus of claim 23, wherein the one or more processors are further configured to cause the apparatus to communicate with the second UE via the first channel or the second channel by communicating via the second channel if the SCIF transmitted to the second UE indicates that the first UE is a stationary unit and a selected zone ID in the SCIF transmitted to the second UE is within a configured range.

27. The apparatus of claim 23, wherein the first UE only communicates via the second channel indicated in the SCIF transmitted to the second UE if the zone ID in the SCIF transmitted to the second UE indicates that the second UE is within a configured range.

28. The apparatus of claim 23, wherein the one or more processors are further configured to cause the apparatus to communicate with the second UE via the first channel or the second channel if the first UE is not a stationary unit by: communicating via the first channel if a selected zone ID in the SCIF received from the second UE is closer in distance to a current zone ID than a selected zone ID in the SCIF transmitted to the second UE; or communicating via the second channel if a selected zone ID in the SCIF transmitted to the second UE is closer in distance to a current zone ID than a selected zone ID in the SCIF received from the first UE.

29. An apparatus for wireless communication by a first user equipment (UE), comprising: means for performing a method of any of claims 1-8.

30. An apparatus for wireless communication by a first user equipment (UE), comprising: means for performing a method of any of claims 9-14.

31. A computer-readable medium storing code for wireless communication by a first user equipment (UE), the code, when executed by one or more processors of the first UE, causing the one or more processors to perform a method of any of claims 1-8.

32. A computer-readable medium storing code for wireless communication by a first user equipment (UE), the code, when executed by one or more processors of the first UE, causing the one or more processors to perform a method of any of claims 9-14.

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