Paging over sidelink

Abstract

Aspects presented herein can enable a base station to page a target UE in an idle mode via a relay UE. In one aspect, a first UE receives, from a base station, a page relay request message including paging information for at least a second UE, each paging information including a UE identity of the second UE and a paging type. The first UE transmits, from the first UE to the second UE over a sidelink, a page message. In another aspect, a base station generates a page relay request message including paging information for at least a second UE, the paging information indicating a UE ID of the second UE and a paging type. The base station transmits, to a first UE, the page relay request message indicating a request for the first UE to relay the paging information to the second UE over a sidelink.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to provisional application S / N.63 / 068,210 entitled “Paging Over Sidelink”, filed August 20, 2020, and U.S. patent application No. 17 / 407,009 entitled “Paging Over Sidelink”, filed August 19, 2021, both of which are expressly incorporated herein by reference in their entirety.

[0003] introduction

[0004] This disclosure generally relates to communication systems, and more particularly to wireless communications including paging.

[0005] Wireless communication systems are widely deployed to provide a variety of telecommunications services such as telephone, video, data, messaging, and broadcasting. Typical wireless communication systems employ multiple access technologies that enable communication with multiple users by sharing available system resources. 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, and Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems.

[0006] These multiple access technologies have been adopted in various telecommunications standards to provide a common protocol enabling different wireless devices to communicate at the city, country, region, and even global levels. An example telecommunications standard is 5G New Radio (NR). 5G NR is part of the continuous evolution of mobile broadband, promulgated by the 3rd Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with the Internet of Things (IoT), and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine-type communications (mMTC), and ultra-reliable low latency communications (URLLC). Some aspects of 5G NR can be based on the 4G Long Term Evolution (LTE) standard. There is a need for further improvements to 5G NR technology. These improvements can also be applied to other multiple access technologies and telecommunications standards that adopt them.

[0007] Brief Overview

[0008] The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

[0009] In an aspect of the disclosure, a method, a computer readable medium, and an apparatus are provided for wireless communication at a first user equipment (UE). The apparatus receives, from a base station, a paging relay request message including paging information for a second UE. The apparatus then transmits, from the first UE to the second UE over a sidelink, a paging message.

[0010] In an aspect of the disclosure, a method, a computer readable medium, and an apparatus are provided for wireless communication at a base station. The apparatus determines to page a first UE in an inactive state or an idle state. The apparatus then transmits, to a second UE, a paging relay request message including paging information, the paging relay request message indicating a request for the second UE to relay the paging information to the first UE over a sidelink.

[0011] In an aspect of the disclosure, a method, a computer readable medium, and an apparatus are provided for wireless communication at a first user equipment (UE). The apparatus receives, from a second UE over a sidelink, a paging message including paging information indicating a paging type for a page from a base station. The apparatus then receives information from the base station based on the paging type indicated in the paging message from the second UE.

[0012] In an aspect of the disclosure, an apparatus for wireless communication at a first UE is provided. The apparatus 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 base station, a paging relay request message including paging information for at least a second UE, each paging information including a UE identity of the second UE and a paging type; and transmit, from the first UE to the second UE over a sidelink, a paging message.

[0013] In another aspect of the disclosure, a method for wireless communication at a first UE is provided. The method includes receiving, from a base station, a paging relay request message including paging information for at least a second UE, each paging information including a UE identity of the second UE and a paging type. The method then includes transmitting, from the first UE to the second UE over a sidelink, a paging message.

[0014] In another aspect of the disclosure, an apparatus for wireless communication at a first UE is provided. The apparatus includes means for receiving, from a base station, a paging relay request message including paging information for at least a second UE, each paging information including a UE identity of the second UE and a paging type. The apparatus includes means for transmitting, from the first UE to the second UE over a sidelink, a paging message.

[0015] In another aspect of the disclosure, a computer-readable storage medium storing computer executable code for wireless communication at a first UE is provided. The code, when executed by a processor, causes the processor to receive, from a base station, a paging relay request message including paging information for at least a second UE, each paging information including a UE identity of the second UE and a paging type; and transmit, from the first UE to the second UE over a sidelink, a paging message.

[0016] In an aspect of the disclosure, an apparatus for wireless communication at a base station is provided. The apparatus includes a memory and at least one processor coupled to the memory, the memory and the at least one processor configured to generate a paging relay request message including paging information for at least a second UE, the paging information indicating a UE ID of the second UE and a paging type; and transmit, to a first UE, the paging relay request message, the paging relay request message indicating a request for the first UE to relay the paging information to the second UE over a sidelink.

[0017] In another aspect of the disclosure, a method for wireless communication at a base station is provided. The method includes generating a paging relay request message including paging information for at least a second UE, the paging information indicating a UE ID of the second UE and a paging type. Subsequently, the method includes transmitting, to a first UE, the paging relay request message, the paging relay request message indicating a request for the first UE to relay the paging information to the second UE over a sidelink.

[0018] In another aspect of the disclosure, an apparatus for wireless communication at a base station is provided. The apparatus includes means for generating a paging relay request message including paging information for at least a second UE, the paging information indicating a UE ID of the second UE and a paging type. The apparatus includes means for transmitting, to a first UE, the paging relay request message, the paging relay request message indicating a request for the first UE to relay the paging information to the second UE over a sidelink.

[0019] In another aspect of the disclosure, a computer-readable storage medium storing computer executable code for wireless communications at a base station is provided. The code, when executed by a processor, causes the processor to generate a paging relay request message including paging information for at least a second UE, the paging information indicating a UE ID of the second UE and a paging type, and transmit the paging relay request message to a first UE, the paging relay request message indicating a request for the first UE to relay paging information on a sidelink to the second UE.

[0020] In an aspect of the disclosure, an apparatus for wireless communication at a second UE is provided. The apparatus includes a memory and at least one processor coupled to the memory, the memory and the at least one processor being configured to receive, from a first UE on a sidelink, a paging message including paging information indicating a paging type for a page from a base station, and receive information from the base station based on the paging type indicated in the paging message from the first UE.

[0021] In another aspect of the disclosure, a method for wireless communication at a second UE is provided. The method includes receiving, from a first UE on a sidelink, a paging message including paging information indicating a paging type for a page from a base station. The method then includes receiving information from the base station based on the paging type indicated in the paging message from the first UE.

[0022] In another aspect of the disclosure, an apparatus for wireless communication at a second UE is provided. The apparatus includes means for receiving, from a first UE on a sidelink, a paging message including paging information indicating a paging type for a page from a base station. The apparatus includes means for receiving information from the base station based on the paging type indicated in the paging message from the first UE.

[0023] In another aspect of the disclosure, a computer-readable storage medium storing computer executable code for wireless communications at a second UE is provided. The code, when executed by a processor, causes the processor to receive, from a first UE on a sidelink, a paging message including paging information indicating a paging type for a page from a base station, and receive information from the base station based on the paging type indicated in the paging message from the first UE.

[0024] To the accomplishment of the foregoing and related aspects, this one or more aspects include the features recited in the following claims, the following description and the appended drawings. The following description and drawings merely exemplify certain illustrative features. It is understood that various aspects can employ aspects from all indications recited. However, other aspects can rely entirely on a subset of the aspects. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a diagram illustrating an example of a wireless communications system and access network.

[0027] Figure 2 Example aspects of a sidelink slot structure are illustrated in accordance with various aspects of the disclosure.

[0028] Figure 3 is a diagram illustrating an example of a first device and a second device involved in wireless communications based on, for example, sidelink.

[0029] Figure 4 Example communication flows for paging a base station to page a UE are illustrated in accordance with various aspects of the disclosure.

[0030] Figure 5 Examples of a serving base station initiating a page for a UE through a target base station are illustrated in accordance with various aspects of the disclosure.

[0031] Figure 6 Examples of paging a UE to provide a system information modification are illustrated in accordance with various aspects of the disclosure.

[0032] Figure 7 Examples of a communication system including UEs within and outside coverage of a base station are illustrated in accordance with various aspects of the disclosure.

[0033] Figure 8A is a diagram illustrating an example of a user plane protocol stack in accordance with various aspects of the disclosure.

[0034] Figure 8B is a diagram illustrating an example of a signaling protocol stack in accordance with various aspects of the disclosure.

[0035] Figure 9 is a diagram illustrating an example of a broadcast procedure on a sidelink in accordance with various aspects of the disclosure.

[0036] Figure 10 is a diagram illustrating an example of a groupcast procedure on a sidelink in accordance with various aspects of the disclosure.

[0037] Figure 11 is a diagram illustrating an example of a unicast procedure on a sidelink in accordance with various aspects of the disclosure.

[0038] Figure 12 is a diagram illustrating an example paging message on a sidelink from a relay UE to a target UE in accordance with various aspects of the disclosure.

[0039] Figure 13is a communication flow illustrating an example of a base station transmitting a paging message or information to a target UE via a relay UE in accordance with various aspects of the present disclosure.

[0040] Figure 14 is a flowchart of a wireless communication method.

[0041] Figure 15 is a diagram illustrating an example of a hardware implementation for an example apparatus.

[0042] Figure 16 is a flowchart of a wireless communication method.

[0043] Figure 17 is a diagram illustrating an example of a hardware implementation for an example apparatus.

[0044] Figure 18 is a flowchart of a wireless communication method.

[0045] Figure 19 is a diagram illustrating an example of a hardware implementation for an example apparatus.

[0046] Figure 20 is a flowchart of a wireless communication method.

[0047] Figure 21 is a diagram illustrating an example of a hardware implementation for an example apparatus.

[0048] Figure 22 is a flowchart of a wireless communication method.

[0049] Figure 23 is a diagram illustrating an example of a hardware implementation for an example apparatus.

[0050] Figure 24 is a flowchart of a wireless communication method.

[0051] Figure 25 is a diagram illustrating an example of a hardware implementation for an example apparatus.

[0052] DETAILED DESCRIPTION

[0053] The detailed description set forth below, in connection with the appended drawings and embodiments described herinin, is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein can be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts can be practiced without

[0054] Several aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented with electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends on the particular application and design constraints imposed on the overall system.

[0055] By way of example, an element, or any portion of an element, or any combination of elements can be implemented as a "processing system" that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on a chip (SoC), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system can execute software. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0056] Accordingly, in one or more examples, the functions described can be implemented in hardware, software, or any combination thereof. If implemented in software, the functions can be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media can be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise a random-access memory (RAM), a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), compact disk ROM (CD-ROM), diskette, hard disk, flash memory, other

[0057] While aspects are described in the context of some examples, those skilled in the art will appreciate that those examples are illustrative and not limiting of the aspects described herein. One skilled in the art will understand that the aspects described herein can be implemented in many different arrangements and scenarios. As such, any arrangement and scenario within the scope of the attached claims should be considered preceded by the aspects described herein. Further, to avoid unnecessarily obscuring the aspects described herein, the details of known product availability, processes, hardware, software, and the like can not be described in detail. Also, for the sake of brevity, conventional techniques related to making and use of the described aspects can or can not have been described in detail. In order to cover all possible implementation scenarios, the following claims are intended to include all possible implementations of the aspects described herein.

[0058] When there is no communication to be exchanged between a base station and a UE for a period of time, the UE can transition to a radio resource control (RRC) idle mode. If the base station receives data or information for a UE in idle mode, the base station can page the UE in order to provide the data or information to the UE. The base station can send a page for any of a number of reasons, such as to trigger a radio resource control setup with the UE, to provide a system information modification to the UE, or to provide a public warning system notification to the UE. In some scenarios, if a UE in idle mode moves out of coverage of a base station, the UE can not reliably receive a page message from the base station outside the range of transmission of the base station.

[0059] Aspects presented herein can enable a base station to reliably transmit one or more paging messages to a UE that is outside of a transmission range of the base station. Aspects presented herein can enable a base station to page a target UE that is in an idle mode. Aspects of the present disclosure provide improved coverage for paging by transmitting a message (e.g., a relay message) to another wireless device (e.g., a relay UE) to be relayed to a target UE over a sidelink. The relay UE can receive paging information for a target UE from a base station and can provide the paging information to the target UE over a sidelink. The term “relay UE” refers to a UE that receives a page from a base station and transmits information about the page or the page itself to a target UE. The term “target UE” refers to a UE that a base station is attempting to page, e.g., a UE to which paging content is directed. The relay UE can be in a location where it reliably receives the page from the base station and reliably transmits to the target UE over a sidelink. Providing paging information to a UE through a distributed environment provided by a sidelink can help improve latency, reliability, and efficiency of a wireless communication system. For example, in cases where a UE is not within a transmission range of a base station, the UE can still be able to receive one or more messages associated with a page from the base station.

[0060] According to one or more aspects, a base station can transmit a paging relay request message containing a paging type and / or a short message on a physical downlink shared channel (PDSCH). The paging type can indicate a trigger for RRC setup, system information modification, and / or an emergency message, among other examples. In one example, the trigger for RRC setup can be for a Uu interface or for a sidelink interface (e.g., a PC5 interface). The short message can indicate a random access resource for a target UE to perform random access with the base station or a sidelink resource for unicast connection setup (e.g., for RRC setup).

[0061] In response to receiving the paging relay request message, the relay UE can transmit a paging message to the target UE on a sidelink. In some examples, the paging message can include one or more (or a list of) paging records. Each paging record can include a paging type and / or a short message. The paging type can indicate a trigger for RRC setup, system information modification, and / or an emergency message, among other examples. The short message can indicate a random access resource for the target UE to perform random access with the base station or a sidelink resource for unicast connection setup (e.g., for RRC setup, new system information, and / or emergency message, among other examples). In cases where the relay UE is aware of the target UE identifier, the paging message can include one or more paging records for the target UE identifier. In cases where the relay UE is not aware of the target UE identifier, the paging message can include a complete list of paging records from the paging message received by the relay UE from the base station. For the purposes of the present disclosure, the term “paging record” or “paging records” can include a paging history, paging related information, information related to one or more past paging (e.g., from a base station), among other examples.

[0062] Figure 1 FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network 100. The wireless communications system, which can be a wireless wide area network (WWAN), includes base stations 102, UEs 104, an Evolved Packet Core (EPC) 160, and a 5G Core (5GC) network 190. A base station 102 can include macro cells (high power cellular base stations) and / or small cells (low power cellular base stations). Macro cells can include base stations. Small cells can include femtocells, picocells, and microcells.

[0063] In certain aspects, the UE 104 can include a paging relay request procedure component 198 configured to relay a page from a base station to another UE. In one configuration, the paging relay request procedure component 198 can be configured to receive, from the base station, a paging relay request message including paging information for at least a second UE, each paging information including a UE identity of the second UE and a paging type. In such a configuration, the paging relay request procedure component 198 can transmit, from the first UE to the second UE on a sidelink, a paging message.

[0064] In certain aspects, the UE 104 can include a relay paging procedure component 199 configured to receive a page from a base station via another UE. In one configuration, the relay paging procedure component 199 can be configured to receive, from a first UE on a sidelink, a paging message including paging information indicating a paging type for a page from the base station. In such a configuration, the relay paging procedure component 199 can receive information from the base station based on the paging type indicated in the paging message from the first UE.

[0065] In certain aspects, the base station 102 can include a paging relay request component 177 configured to request a first UE to relay a paging message to a second UE of the base station 102. In one configuration, the paging relay request component 177 can be configured to generate a paging relay request message including paging information for at least the second UE, the paging information indicating a UE ID of the second UE and a paging type. In such a configuration, the paging relay request component 177 can transmit the paging relay request message to the first UE, the paging relay request message indicating a request for the first UE to relay the paging information to the second UE over a sidelink.

[0066] The base stations 102 configured for 4G LTE (collectively referred to as the Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) can interface with the EPC 160 through first backhaul links 132 (e.g., S I interface). The base stations 102 configured for 5G NR (collectively referred to as Next Generation RAN (NG-RAN)) can interface with the 5GC 190 through second backhaul links 184. In addition to other functions, the base stations 102 can perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection setup and release, load balancing, distribution of paging messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment trace, RAN information management (RIM), paging, positioning, and delivery of warning messages. The base stations 102 can communicate directly or indirectly (e.g., through the EPC 160 or 5GC 190) with each other over third backhaul links 134 (e.g., X2 interface). The first backhaul links 132, the second backhaul links 184 (e.g., Xn interface), and the third backhaul links 134 can be wired or wireless.

[0067] In some aspects, the base station 102 or 180 can be referred to as a RAN and can include aggregated or disaggregated components. As an example of a disaggregated RAN, the base station can include a central unit (CU) 103, one or more distributed units (DUs) 105, and / or one or more remote units (RUs) 109, as illustrated in FIG. 1C. In this example, the CU 103 can be located at a central location, and the DUs 105 and / or RUs 109 can be located at edges of the network. Figure 1The RAN can be decomposed with a split between the CU 103 and aggregated DU / RU. The CU 103 and one or more DUs 105 can be connected via an Fl interface. The DUs 105 and RUs 109 can be connected via a fronthaul interface. The connection between the CU 103 and the DUs 109 can be referred to as midhaul, while the connection between the DUs 105 and the RUs 109 can be referred to as fronthaul. The connection between the CU 103 and the core network can be referred to as backhaul. The RAN can be based on a functional split between various components of the RAN (e.g., between the CU 103, DU 105, or RU 109). The CU can be configured to perform one or more aspects of a wireless communication protocol (e.g., handle one or more layers of a protocol stack), and the DU(s) can be configured to handle other aspects of the wireless communication protocol (e.g., other layers of the protocol stack). The split between the layers handled by the CU and the layers handled by the DU can occur at different layers of the protocol stack in different implementations. As one non-limiting example, the DU 105 can provide logical nodes to host at least a portion of a radio link control (RLC) layer, a medium access control (MAC) layer, and a physical (PHY) layer based on the functional split. The RU can provide logical nodes configured to host at least a portion of the PHY layer and radio frequency (RF) processing. The CU 103 can host higher layer functionality, e.g., above the RLC layer, such as a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer. The split between the layer functionality provided by the CU, DU, or RU can be different in other implementations.

[0068] The access network can include one or more integrated access and backhaul (IAB) nodes 111 that exchange wireless communications with the UE 104 or other IAB nodes 111 to provide access and backhaul to the core network. In an IAB network of multiple IAB nodes, an anchor node can be referred to as an IAB donor. The IAB donor can be a base station 102 or 180 that provides access and / or control of one or more IAB nodes 111 to the core network 190 or EPC 160. The IAB donor can include a CU 103 and a DU 105. The IAB nodes 111 can include a DU 105 and a mobile termination (MT) 113. The DU 105 of the IAB node 111 can operate as a parent node, while the MT 113 can operate as a child node.

[0069] The base stations 102 can wirelessly communicate with the UEs 104. Each of the base stations 102 can provide communication coverage for a respective geographic coverage area 110. There can be overlapping geographic coverage areas 110. For example, a small cell 102' can have a coverage area 110' that overlaps with one or more macrocells 102. A network that includes both small cell and macrocells can be known as a heterogeneous network. A heterogeneous network can also include Home Evolved Node Bs (eNBs) (HeNBs), which can provide service to a restricted group known as a closed subscriber group (CSG). The communication links 120 between the base stations 102 and the UEs 104 can include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and / or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104. The communication links 120 can use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity. These communication links can be through one or more carriers, where a carrier can be a set of

[0070] Certain UEs 104 can communicate with each other using device-to-device (D2D) communication link 158. The D2D communication link 158 can use the DL / UL WWAN spectrum. The D2D communication link 158 can use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). D2D communication can be through a variety of wireless D2D communication systems, such as for example, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.

[0071] Some examples of sidelink communication can include vehicle-based communications from vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I) (e.g., from a vehicle-based communication device to road infrastructure nodes such as road-side units (RSUs)), vehicle-to-network (V2N) (e.g., from a vehicle-based communication device to one or more network nodes such as a base station), vehicle-to-pedestrian (V2P), cellular vehicle-to-everything (CV2X), and / or combinations thereof and / or communications with other devices, which can be collectively referred to as vehicle-to-everything (V2X) communications. Sidelink communications can be based on V2X or other D2D communications, such as Proximity Services (ProSe), among other examples. In addition to UEs, sidelink communications can also be transmitted and received by other transmitter and receiver devices such as road-side units (RSUs) 107, among other examples. Sidelink communications can be exchanged using a PC5 interface, such as described in connection with the examples in Figure 2 The following description of example slot structures including Figure 2 Although the following description of example slot structures including

[0072] The wireless communications system can further include a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 via communication links 154, e.g., in a 5 GHz unlicensed frequency spectrum. When communicating in an unlicensed frequency spectrum, the STAs 152 / AP 150 can perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.

[0073] The small cell 102' can operate in a licensed and / or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell 102' can employ NR and use the same 5 GHz unlicensed frequency spectrum as used by the Wi-Fi AP 150. The small cell 102' employing NR in an unlicensed frequency spectrum can boost coverage and / or increase capacity for the access network.

[0074] The electromagnetic spectrum is often subdivided based on frequency / wavelength into various classes, bands, channels, etc. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz - 7.125 GHz) and FR2 (24.25 GHz - 52.6 GHz). Although a portion of FR1 is greater than 6 GHz, FR1 is often (interchangeably) referred to in various documents and articles as a “sub-6 GHz” band. A similar nomenclature issue sometimes occurs with respect to FR2, which is often (interchangeably) referred to in documents and articles as a “millimeter wave” band, despite being different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) which is designated as a “millimeter wave” band by the International Telecommunications Union (ITU).

[0075] The frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Recent 5G NR studies have identified operating bands for these mid-band frequencies as frequency range designation FR3 (7.125 GHz - 24.25 GHz). Bands falling within FR3 can inherit FR1 and / or FR2 characteristics, and as such can effectively extend the features of FR1 and / or FR2 into mid-band frequencies. Additionally, higher operating bands are currently being explored to extend 5G NR operations beyond 52.6 GHz. For example, three higher operating bands have been identified as frequency range designations FR4-a or FR4-1 (52.6 GHz - 71 GHz), FR4 (52.6 GHz - 114.25 GHz), and FR5 (114.25 GHz - 300 GHz). Each of these higher bands falls within the EHF band.

[0076] With the above aspects in mind, unless specifically stated otherwise, it should be understood that the term “sub-6 GHz” or the like, if used herein, can broadly represent frequencies that can be less than 6 GHz, can be within FR1, or can include mid-band frequencies. Further, unless specifically stated otherwise, it should be understood that the term “millimeter wave” or the like, if used herein, can broadly represent frequencies that can include mid-band frequencies, can be within FR2, FR4, FR4-a or FR4-1, and / or FR5, or can be within the EHF band.

[0077] Whether small cell 102' or a large cell (e.g., macro base station), base stations 102 can include and / or be referred to as an eNB, gNB, or another type of base station. Some base stations, such as gNB 180 can operate in a traditional sub 6 GHz spectrum, in millimeter wave frequencies, and / or near millimeter wave frequencies in communication with UEs 104. When the gNB 180 operates in millimeter wave frequencies or near millimeter wave frequencies, the gNB 180 can be referred to as a millimeter wave base station. The millimeter wave base station 180 can utilize beamforming 182 with the UEs 104 to compensate for the path loss and short range. The base station 180 and the UEs 104 can each include a plurality of antennas, such as antenna elements, antenna panels, and / or antenna arrays to facilitate beamforming.

[0078] The base station 180 can transmit a beamformed signal to the UE 104 in one or more transmit directions 182'. The UE 104 can receive the beamformed signal from the base station 180 in one or more receive directions 182". The UE 104 can also transmit a beamformed signal to the base station 180 in one or more transmit directions. The base station 180 can receive the beamformed signal from the UE 104 in one or more receive directions. The base station 180 / UE 104 can perform beam training to determine the best receive and transmit directions for each of the base station 180 / UE 104. The transmit and receive directions of the base station 180 can or can not be the same. The transmit and receive directions of the UE 104 can or can not be the same.

[0079] The EPC 160 can include a mobility management entity (MME) 162, other MMEs 164, a serving gateway 166, a multimedia broadcast multicast service (MBMS) gateway 168, a broadcast multicast service center (BM-SC) 170, and a packet data network (PDN) gateway 172. The MME 162 can be in communication with a home subscriber server (HSS) 174. The MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160. Generally, the MME 162 provides bearer and connection management. All user Internet protocol (IP) packets are transferred through the serving gateway 166, which itself is connected to the PDN gateway 172. The PDN gateway 172 provides UE IP address allocation as well as other functions. The PDN gateway 172 and the BM-SC 170 are connected to the IP services 176. The IP services 176 can include the Internet, an intranet, an IP multimedia subsystem (IMS), a PS streaming service, and / or other IP services. The BM-SC 170 can provide functions for MBMS user service provisioning and

[0080] The core network 190 can include an access and mobility management function (AMF) 192, other AMFs 193, a session management function (SMF) 194, and a user plane function (UPF) 195. The AMF 192 can be in communication with a unified data management (UDM) 196. The AMF 192 is the control node that processes the signaling between the UEs 104 and the core network 190. Generally, the AMF 192 provides QoS flow and session management. All user Internet protocol (IP) packets are transferred

[0081] A base station can include and / or be referred to as a gNB, NodeB, eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transceiver function, a Basic Service Set (BSS), an Extended Service Set (ESS), a Transmitter-Receiver Point (TRP), or some other suitable terminology. The base station 102 provides wireless access to the EPC 160 or core network 190 for UEs 104. Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitch

[0082] Figure 2 FIGs. 200 and 210 include example aspects illustrating a slot structure that can be used for sidelink communications (e.g., between UEs 104, RSUs 107, etc.). In some examples, the slot structure can be within a 5G / NR frame structure. In other examples, the slot structure can be within a LTE frame structure. Although the following description can focus on 5G NR, the concepts described herein can be applicable to other similar areas, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies. Figure 2The example slot structure in FIG. 2 is merely an example, and other sidelink communications can have different frame structures and / or different channels for sidelink communications. A frame (10 ms) can be divided into 10 equally sized subframes (1 ms). Each subframe can include one or more slots. A subframe can also include mini-slots, which can include 7, 4, or 2 symbols. Each slot can include 7 or 14 symbols, depending on the slot configuration. For a slot configuration 0, each slot can include 14 symbols, and for a slot configuration 1, each slot can include 7 symbols. The diagram 200 illustrates a single resource block of a single slot transmission, e.g., which can correspond to a 0.5 ms transmission time interval (TTI). A physical sidelink control channel can be configured to occupy multiple physical resource blocks (PRBs), e.g., 10, 12, 15, 20, or 25 PRBs. The PSCCH can be limited to a single subchannel. For example, the PSCCH duration can be configured to be 2 symbols or 3 symbols. For example, a subchannel can include 10, 15, 20, 25, 50, 75, or 100 PRBs. Resources for sidelink transmissions can be selected from a resource pool including one or more subchannels. As a non-limiting example, a resource pool can include between 1-27 subchannels. A PSCCH size can be established for a resource pool, e.g., between 10-100% of one subchannel for a duration of 2 symbols or 3 symbols. Figure 2 The diagram 210 in FIG. 2 illustrates an example where the PSCCH occupies about 50% of a subchannel, as one example to illustrate the concept of a PSCCH occupying a portion of a subchannel. A physical sidelink shared channel (PSSCH) occupies at least one subchannel. In some examples, the PSCCH can include a first portion of sidelink control information (SCI) and the PSSCH can include a second portion of the SCI.

[0083] A resource grid can be used to represent the frame structure. Each time slot can include a resource block (RB) (also referred to as a physical RB (PRB)) that extends 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme. As Figure 2 As illustrated in FIG. 2, some REs can include control information in a PSCCH and some REs can include a demodulation RS (DMRS). At least one symbol can be used for feedback. Figure 2An example with two symbols for a physical sidelink feedback channel (PSFCH) with an adjacent gap symbol is illustrated. The symbol before and / or after the feedback can be used to turn around between data reception and feedback transmission. The gap enables the device to switch from operating as a transmitting device (e.g., in a subsequent slot) to preparing to operate as a receiving device. As illustrated, data can be transmitted in the remaining REs. The data can include the data messages described herein. The location of any of the data, DMRS, SCI, feedback, gap symbol, and / or LBT symbol can be different than the examples illustrated in FIGS. 1-3. In some aspects, multiple slots can be aggregated together. Figure 2 In some aspects, multiple slots can be aggregated together.

[0084] Figure 3 is a block diagram of a first wireless communication device 310 in communication with a second wireless communication device 350 based on a sidelink. In some examples, the devices 310 and 350 can communicate based on V2X or other D2D communication. The communication can be based on a sidelink (e.g., using a PC5 interface). The devices 310 and 350 can include UEs, RSUs, base stations, etc. Packets can be provided to a controller / processor 375, which provides functionality for layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller / processor 375 provides RRC layer functionality related to broadcasting of system information (e.g., MIB, SIBs), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter-radio access technology (RAT) mobility, and measurement configuration and reporting of measurements results by UEs; PDCP layer functionality related to header compression / decompression, security (ciphering, deciphering, integrity protection, integrity verification), and handover support functions; RLC layer functionality related to the transfer of upper layer packet data units (PDUs), error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality related to mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0085] The transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1, which includes a physical (PHY) layer, can include error detection on the transport channels, forward error correction (FEC) coding / decoding of the transport channels, interleaving, rate matching, mapping to physical channels, modulation / demodulation of physical channels, and MIMO antenna processing. The TX processor 316 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The coded and modulated symbols can then be split into parallel streams. Each stream can then be mapped to a OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially precoded to produce multiple spatial streams. Channel estimates from a channel estimator 374 can be used to determine the coding and modulation schemes, as well as for spatial processing. The channel estimate can be

[0086] Each receiver 354RX receives a signal through its respective antenna 352. Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions. The RX processor 356 can perform spatial processing on the information to recover any spatial streams destined for the device 350. If multiple spatial streams are destined for the device 350, they can be combined by the RX processor 356 into a single OFDM symbol stream. The RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT). The frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, and the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by device 310. The soft decisions can be based on channel estimates computed by the channel estimator 358. The soft decisions are then decoded and de-interleaved to recover the data and control signals that were originally transmitted by the device 310 on the physical channel. The data and control signals are then provided to the controller / processor 359, which implements layer 3 and layer 2 functionality.

[0087] The controller / processor 359 can be associated with a memory 360 that stores program codes and data. The memory 360 can be referred to as a computer-readable medium. The controller / processor 359, therefore, can provide demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the device 310. The controller / processor 359 is also responsible for error detection using an ACK and / or NACK protocol to support HARQ operations.

[0088] Similar to the functionality described in connection with the DL transmission by the device 310, the controller / processor 359 can provide RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression / decompression, and security (ciphering, deciphering, integrity protection, integrity verification); RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0089] Channel estimates derived by the channel estimator 358 from a reference signal or feedback transmitted by the device 310 can be used by the TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing. The spatial streams generated by the TX processor 368 can be provided to different antenna 352 via separate transmitters 354TX. Each transmitter 354TX can modulate an RF carrier with a respective spatial stream for transmission.

[0090] The transmission is processed at the device 310 in a manner similar to that described in connection with the receiver function at the device 350. Each receiver 318RX receives a signal through its respective antenna 320. Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to the RX processor 370.

[0091] The controller / processor 375 can be associated with a memory 376 that stores program codes and data. The memory 376 can be referred to as a computer-readable medium. The controller / processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the device 350. The controller / processor 375 is also responsible for error detection using an ACK and / or NACK protocol to support HARQ operations.

[0092] In one example, at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 can be configured to perform aspects in connection with the paging relay request procedure component 198. In another example, at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 can be configured to perform aspects in connection with the relay paging procedure component 199. In another example, at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 can be configured to perform aspects in connection with both the paging relay request procedure component 198 and the relay paging procedure component 199. In another example, at least one of the TX processor 316, the RX processor 370, and the controller / processor 375 can be configured to perform aspects in connection with the paging relay request component 177. Figure 1 In one example, at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 can be configured to perform aspects in connection with the paging relay request procedure component 198. In another example, at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 can be configured to perform aspects in connection with the relay paging procedure component 199. In another example, at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 can be configured to perform aspects in connection with both the paging relay request procedure component 198 and the relay paging procedure component 199. In another example, at least one of the TX processor 316, the RX processor 370, and the controller / processor 375 can be configured to perform aspects in connection with the paging relay request component 177. Figure 1 In one example, at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 can be configured to perform aspects in connection with the paging relay request procedure component 198. In another example, at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 can be configured to perform aspects in connection with the relay paging procedure component 199. In another example, at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 can be configured to perform aspects in connection with both the paging relay request procedure component 198 and the relay paging procedure component 199. In another example, at least one of the TX processor 316, the RX processor 370, and the controller / processor 375 can be configured to perform aspects in connection with the paging relay request component 177. Figure 1 In one example, at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 can be configured to perform aspects in connection with the paging relay request procedure component 198. In another example, at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 can be configured to perform aspects in connection with the relay paging procedure component 199. In another example, at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 can be configured to perform aspects in connection with both the paging relay request procedure component 198 and the relay paging procedure component 199. In another example, at least one of the TX processor 316, the RX processor 370, and the controller / processor 375 can be configured to perform aspects in connection with the paging relay request component 177. Figure 1 In one example, at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 can be configured to perform aspects in connection with the paging relay request procedure component 198. In another example, at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 can be configured to perform aspects in connection with the relay paging procedure component 199. In another example, at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 can be configured to perform aspects in connection with both the paging relay request procedure component 198 and the relay paging procedure component 199. In another example, at least one of the TX processor 316, the RX processor 370, and the controller / processor 375 can be configured to perform aspects in connection with the paging relay request component 177.

[0093] A base station (e.g., base station 102 or 180) can page a UE (e.g., UE 104) for various reasons. For example, a base station can page a UE to trigger RRC setup. For example, a base station can page a UE in an RRC idle or RRC inactive state to trigger a transition to an RRC connected state in order to transmit data to the UE. A base station can page a UE to indicate a modification of system information to the UE. A base station can page a UE to provide an alert, such as a public warning system alert, an earthquake and tsunami warning system (ETWS) notification, a commercial mobile alert system (CMAS) notification, and / or an emergency message notification, among other examples. A UE can operate based on a discontinuous reception (DRX) cycle, where the UE wakes up (e.g., from a sleep mode) to monitor a paging occasion (PO). If the UE does not receive a page, the UE can return to a sleep mode or a lower power mode where the UE does not monitor a physical downlink control channel (PDCCH) from the base station. If the UE does receive a page from the base station, the UE can prepare to receive additional downlink messages from the base station. In some examples, a UE can monitor one paging occasion per discontinuous reception (DRX) cycle. A paging occasion can include a set of PDCCH monitoring occasions and can include multiple slots where the UE can receive a paging DCI from the base station.

[0094] To page a UE, a base station can send a PDCCH message indicating the resources used for the corresponding Physical Downlink Shared Channel (PDSCH). For example, the PDCCH message can be a Downlink Control Information (DCI) format 1_0 message, scrambled with a Paging Radio Network Temporary Identifier (P-RNTI) by the base station using Cyclic Redundancy Check (CRC) bits. If the UE receives the DCI and determines that it has been scrambled with the P-RNTI, the UE can receive the corresponding paging message on the PDSCH and determine whether the PDSCH indicates that the UE is being paged (e.g., in an associated paging event). The paging message in the PDSCH can include the UE identifier used by the UE to determine whether the paging message is directed to the UE. If the UE's identifier is included in the PDSCH associated with the P-RNTI-scrambled DCI, the UE can determine that the base station is paged and can continue to monitor communications from the base station.

[0095] Figure 4 The example communication flow 400, including paging a UE in the RRC idle state, is explained. Figure 4 In this context, UE 402 is in RRC idle state 401. UE 402 monitors PDCCH(s) from base station 404 during paging occasions 403a, 403b, and 403c, according to the DRX cycle configured for UE 402 by base station 404. Base station 404 receives data from network 406 (e.g., from sources such as...). Figure 1 The AMF (AMF) of AMF192 in the network 404 receives paging information 405 for UE 402. In response to receiving paging information 405 from network 406, base station 404 transmits PDCCH 407 with CRC bits scrambled with P-RNTI to UE 402 during paging timing 403c, where PDCCH 407 indicates the resources for the corresponding PDSCH 409. In response to receiving PDCCH 407 based on P-RNTI, UE 402 receives PDSCH 409 including a paging message for UE 402. The paging message may indicate an identifier for UE 402 used to notify UE 402 that the paging message is for UE 402. In response to receiving the paging message in PDSCH 409, UE 402 transitions to an RRC connectivity state with base station 404. UE 402 may execute the steps of random access procedure 411 to establish or re-establish an RRC connection with base station 404. Following random access procedure 411, UE 402 may transmit an RRC setup request 413 to base station 404. Base station 404 may respond with an RRC setup message 415, and UE 402 may respond with an RRC setup completion message and / or a service request to the network 417. In the case of UE 402 transmitting a service request, base station 404 sends an initial message / service request 419 to network 406. (As per...)Figure 4 As shown, the base station 404 can not have a context for the UE in RRC idle state. As such, the core network (e.g., AMF) initiates paging of the UE to initiate paging of the target UE 402 by sending an NG Application Protocol (NGAP) paging message to the base station 404 to initiate paging of the target UE 402. The base station 404 then sends an RRC paging message (e.g., via PDSCH 409) to the target UE 402. For the purposes of this disclosure, a “target UE” can refer to a UE to which a page is directed or the ultimate recipient of a paging message.

[0096] For a UE in RRC inactive state, but not RRC idle state, the serving base station can have a context for the UE. As such, the serving base station can initiate paging of the target UE. Figure 5 An example 500 is illustrated in which the serving base station 504 receives downlink data for a target UE from the core network (e.g., from the UPF 502). The serving base station 504 sends an Xn Access Protocol (XnAP) paging message for the target UE to one or more target base stations 506. The target base station(s) 506 then communicate an RRC paging message to the target UE, as described in connection with Figure 4 When the inactive target UE receives the paging message, the inactive target UE can reestablish a connection with the base station in order to receive the downlink data.

[0097] Figure 6 Example communication flows 600 for paging an inactive or idle UE to update system information and 650 for paging an RRC connected UE to update system information are illustrated. In Figure 6 In, a UE, whether an RRC idle or inactive state UE 602a or an RRC connected state UE 602b, monitors a PDCCH from a base station 604 during a paging occasion. When the UE receives a page 605 (e.g., a PDCCH with CRC bits scrambled with a P-RNTI), the UE monitors for updated system information 607. The base station 604 can transmit the updated system information 607 to the UE multiple times or in multiple messages after sending the page 605, as described in connection with Figure 6The PDCCH transmitted as the page 605 can include a message indicating that the page is for a system information update. For example, the message can be in a DCI format 1 0 indicating that system information has been updated or indicating an upcoming warning message (e.g., ETWS / CMAS message). In the communication flow 600, the paging occasions 603a, 603b, and 603c for the UE 602a can be based on a DRX cycle of the UE 602a. The paging occasions 609a, 609b, 609c for the UE 602b can be based on a system information modification period. For example, in Figure 6 In some aspects, rather than using an NGAP message, an XnAP message, or an RRC paging message, a page can be provided to the UE 602a or 602b through a PDCCH transmission, e.g., the page 605.

[0098] At times, a UE can be out of coverage of a base station. Figure 7 A communication system 700 is illustrated that includes a base station 710 that provides coverage 701. UEs 702, 704, and 706 are within the coverage 701 of the base station 710, while UE 708 is out of coverage of the base station 710. If the base station 710 has a paging message for the UE 708, the UE 708 can not be able to receive the paging message directly from the base station 710. Aspects presented herein provide for relaying the paging message to the out-of-coverage UE 708 over a sidelink. For example, a wireless device within the coverage 701 can receive the paging message from the base station 710 and provide the paging information to the out-of-coverage UE 708. For example, the UE 702 in the coverage 701 can receive the paging message for the UE 708 from the base station 710 over an access link 714 with the base station 710 based on a Uu interface and can provide the paging message or information from the paging message to the out-of-coverage UE 708 over a sidelink 716 based on a sidelink (e.g., over a PC5 interface). The UE 708 that is the recipient of the paging message can be referred to herein as a “target UE.” The UE 702 that receives the paging message from the base station 710 and provides the paging information to the target UE can be referred to as a “relay UE.” Although aspects are described herein with respect to relaying for a “UE,” the aspects can be applied by any device capable of communicating via a sidelink, such as a RSU, etc.

[0099] To establish communication over a sidelink, a user-level protocol stack can be used to exchange user data, and a control-level protocol stack can be defined to exchange control messages. Figure 8Ais a diagram 800A illustrating an example of a user plane protocol stack for sidelink communications. In some examples, the user plane protocol stack can correspond to a user plane for a PC5 reference point (e.g., PC5-U) to support V2X services as an example of sidelink communications for a first UE (UE A) and a second UE (UE B). IP and non-IP packet data convergence protocol (PDCP) service data unit (SDU) types can support sidelink communications. Figure 8B is a diagram 800B illustrating an example of a signaling protocol stack for sidelink communications. In some examples, the signaling protocol stack can correspond to a control plane for a PC5 reference point (e.g., PC5-S) for a first UE (UE A) and a second UE (UE B). In some examples, sidelink messages can be carried in RRC signaling. A physical (PHY) layer can communicate sidelink data (e.g., using 10 MHz, 20 MHz, or other bandwidth, etc.). A MAC layer can manage packet flow control and resource allocation. A radio link control (RLC) layer can enable upper layer protocol data units (PDUs) to be delivered in various modes (e.g., acknowledged mode, unacknowledged mode, and transparent mode, etc.), and the RLC layer can also ensure appropriate concatenation, segmentation, and reassembly for RLC SDUs.

[0100] In some examples, a sidelink message (e.g., a message communicated via sidelink 716) can include a layer 2 identifier (L2 ID) for sidelink communications over a PC5 reference point. For example, each UE can have one or more L2 IDs for sidelink communications. The L2 ID can include one or more source L2 IDs and / or one or more destination L2 IDs. The source and / or destination L2 IDs can be included in a layer 2 frame sent from a relay UE to a target UE over a layer 2 link. In one configuration, a source L2 ID can be self-assigned by a UE originating a corresponding layer 2 frame.

[0101] In some examples, a destination L2 ID can be mapped to a sidelink (e.g., V2X) service type for a sidelink application that is broadcasted. In some examples, a destination L2 ID can be mapped to a sidelink (e.g., V2X) service type for a sidelink application that is groupcasted. A default destination L2 ID can be mapped for initial signaling to establish a unicast connection and a service type for a sidelink application. A set of mapping information can be provided to a UE.

[0102] In some examples, the selection of the destination L2 ID can depend on the type of sidelink communication, e.g., whether the sidelink communication is unicast, broadcast, or groupcast, etc. For example, the destination L2 ID for a broadcast sidelink communication can be selected based on a mapping between service type (e.g., PSID / ITS-AID) and L2 ID. For a groupcast sidelink communication, group identifier information can be provided by an application layer (e.g., V2X application layer), and the UE can convert the provided group identifier to a destination L2 ID. Otherwise, if group identifier information is not provided, the UE can determine the L2 ID based on a mapping between service type (e.g., provider service identifier (PSID) / intelligent transportation system application identifier (ITS-AID)) and L2 ID. For unicast sidelink communication, initial signaling to establish a unicast link (e.g., PC5 unicast link) can use a known L2 ID of the communication peer, or a default destination L2 ID (e.g., PSID / ITS-AID) associated with a sidelink service type configured for unicast link establishment. During the unicast link establishment procedure, the L2 ID can be exchanged between the two UEs and can be used for future communication between the two UEs. A UE can establish multiple unicast links with peer UEs and use the same or different source L2 ID for these unicast links. For example, a relay UE (e.g., 702) can relay paging information over a sidelink (e.g., 716) to a target UE (e.g., 708) using L2 IDs based on the type of communication (e.g., unicast, broadcast, or groupcast) and / or based on any of these additional aspects.

[0103] Figure 9 FIG. 900 is a diagram 900 illustrating an example of a broadcast procedure over a sidelink from a transmitting UE 902 (e.g., Tx UE) to one or more receiving UEs 904 (e.g., Rx UE-1, Rx UE-2,... Rx UE-n). At 906, the receiving UE(s) 904 can determine a destination L2 ID for broadcast reception. At 908, a sidelink (e.g., V2X) application layer of the transmitting UE 902 can provide a data unit for the transmitting UE 902. Subsequently, at 910, the transmitting UE 902 can determine a destination L2 ID for broadcast. At 912, the transmitting UE 902 can transmit (e.g., broadcast) sidelink service data (e.g., V2X service data) using a source L2 ID and the destination L2 ID.

[0104] Figure 10FIG. 1000 is a diagram 1000 illustrating an example of a groupcast procedure over sidelink. At 1006, sidelink (e.g., V2X) group management can be performed by an application layer at a transmitter UE 1002 and one or more receiver UE(s) 1004. At 1008, the transmitter UE 1002 can determine a source L2 ID and a destination L2 ID, and the receiver UE(s) 1004 can determine a destination L2 ID. Then at 1010, the transmitter UE 1002 can transmit sidelink service data (e.g., in groupcast) using the source L2 ID and the destination L2 ID. Additionally, at 1012, the application layer can provide group identifier information (e.g., an application layer V2X group identifier) to the transmitter UE 1002 and / or the receiver UE(s) 1004, before the transmitter UE 1002 determines the source and destination L2 IDs and / or before the receiver UE(s) 1004 determines the destination L2 ID.

[0105] Figure 11 FIG. 1100 is a diagram 1100 illustrating an example of a unicast procedure over sidelink. At 1106, one or more UEs (e.g., UE-2 1104a, UE-3 1104b, UE-n 1104c, etc.) can determine a destination L2 ID for unicast link (e.g., PC5 unicast link) establishment. At 1108, a sidelink (e.g., V2X) application layer in UE-1 1102 can provide application information for sidelink communication. Then, at 1110, UE-1 1102 can transmit a direct communication request message (e.g., in groupcast or unicast) to the one or more UEs to initiate a unicast layer 2 link establishment procedure. UE-1 1102 can establish security with the one or more UEs based on at least one of the following ways. In one configuration, where target user information (e.g., Target User Info) is included in a direct communication request (such as for UE-oriented layer 2 link establishment 1112) transmitted from UE-1 1102 (e.g., at 1110), then at 1114, the target UE (e.g., UE-2 1104a) can respond to the direct communication request message by establishing security with UE-1 1102. Where the target user information is not included in a direct communication request message (such as for sidelink (e.g., V2X) service-oriented layer 2 link establishment 1120) (e.g., target user is not specified), then at 1122, UEs (e.g., UE-2 1104a, UE-n 1104c) interested in using a declared sidelink service (e.g., V2X service) over a sidelink with UE-1 1102 can respond to the direct communication request message by establishing security with UE-1 1102.

[0106] After security is established (e.g., at 1114 or 1122), a direct communication accept message can be sent by the target UE (e.g., UE-2 1104a) to UE-1 1102 for UE-oriented Layer 2 link establishment 1112 or by UEs interested in using the announced sidelink service(s) (e.g., UE-2 1104a and / or UE-n 1104c) for sidelink service-oriented Layer 2 link establishment 1120. For example, at 1116, if the application layer ID for UE-2 1104a matches, the target UE-2 1104a can respond to UE-1 1102 with a direct communication accept message. Similarly, UEs interested in using the announced sidelink service(s) (e.g., UE-2 1104a and / or UE-n 1104c) can respond to the direct communication request by sending a direct communication accept message, such as shown at 1124. After direct communication is established between UE-1 1102 and one or more UEs, at 1118, UE-1 1102 can send sidelink service data to the one or more UEs (e.g., UE-2 1104a and / or UE-n 1104c) that have accepted direct communication based on the source L2 ID and the destination L2 ID.

[0107] Aspects presented herein can provide extended network coverage for paging messages by relaying the paging messages from a base station over a sidelink. If a target UE is out of coverage and the base station is unable to directly page the UE, the base station can request a relay UE to forward a paging message to the target UE in order to reach the target UE. In some examples, transmission of the paging message can fail because the channel state between the base station and the target UE can have changed. The relayed paging presented herein can enable the base station to diversify communications by transmitting repetitions of the paging message to the target UE over different sidelink(s). The added diversity can reduce the latency for the target UE to receive the paging message and connect to the base station to receive pending data from the base station. In some examples, the base station can combine paging messages for multiple target UEs into a single relay message to a relay UE. The combined paging messages can reduce signaling overhead over the Uu link between the base station and the paging UEs.

[0108] Aspects presented herein can enable a base station, a relay UE, and / or a target UE to use different types of paging-related messages or include different types of paging information in a paging message to improve efficiency, latency, and reliability of a paging procedure. In one aspect, a base station (e.g., base station 1230) can transmit a paging relay request message (e.g., paging relay request message 1232) to a relay UE (e.g., relay UE 1202) on an access link, such as via a PDSCH. The paging relay request message can include a paging type and / or a short message. The paging type can indicate at least one of the following types for the paging: trigger RRC setup, system information modification, and / or ETWS / CMAS message, etc. In a case where the paging type indicates that the paging (e.g., from the base station to the target UE) is to trigger an RRC setup (e.g., over a Uu or a PC5 interface) of the target UE, the base station can use the short message to indicate radio resources for random access or unicast connection setup, such as shown by Table 1 below. For example, in a case where the RRC setup for the target UE is triggered over a Uu interface, the base station can indicate one or more PRACH resources for random access in the short message (e.g., after the target UE receives the paging message), and in a case where the RRC setup for the target UE is triggered over a sidelink (e.g., PC5 interface), the base station can indicate sidelink resources for unicast connection setup (e.g., for the target UE to establish a communication with the relay UE) in the short message. On the other hand, if the paging type indicates a system information modification or an ETWS / CMAS message, the base station can not use the short message or include any short message in the paging relay request message. In one example, since the short message can be optional or additional, if the base station does not include resources for PRACH for random access or resources for sidelink for unicast connection setup, the target UE can select the resources by itself.

[0109] Paging Type Short Message (may be additional) RRC Setup triggered over Uu PRACH resources for random access RRC Setup triggered over sidelink Sidelink resources for unicast connection setup

[0110] Table 1 - Examples of paging type and short message in paging relay request message

[0111] In another aspect, upon receiving a paging relay request message from the base station, the relay UE can transmit a paging message to the target UE on the sidelink, where the paging message can be an RRC setup trigger message, a system information modification message, an ETWS / CMAS notification message, an emergency message / notification, or a combination thereof. Different types of paging messages can be indicated differently to the UE in non-sidelink communications between the base station and the UE (e.g., on the Uu interface). For example, as shown by Table 2 below, if the paging message is for triggering RRC setup, it can be indicated in the paging message on PDSCH. If the paging message is for system information modification or ETWS / CMAS notification, it can be indicated in the first bit or the second bit of DCI format 1 0 short message, respectively.

[0112] Paging Type Identifier Trigger RRC Setup RRC Paging Message on PDSCH System Information Modification First bit of DCI Format 1 0 Short Message ETWS / CMAS Notification Second bit of DCI Format 1 0 Short Message

[0113] Table 2 - Examples of Paging Messages on Non-Sidelink Communications

[0114] Since sidelink communications can not be using DCI and / or PDSCH, different types of paging messages can be communicated from the relay UE (e.g., relay UE 702) to the target UE (e.g., target UE 708) on the sidelink (e.g., sidelink 716). Figure 12is a diagram 1200 illustrating an example paging message transmitted over a sidelink (e.g., via a PC5 interface) from a relay UE to a target UE in accordance with aspects of the present disclosure. In one aspect, after receiving one or more paging relay request messages 1232 from a base station 1230, a relay UE 1202 can send a paging message 1204 to a target UE 1208 over a sidelink 1206, where the paging message 1204 can include one or more paging records 1210 (e.g., paging history, paging related information, information related to one or more past pages, etc.), and each paging record 1212 within the one or more paging records 1210 can include one or more of: a UE identity 1214 of the target UE, a full or partial paging record 1216 (e.g., a paging history, a list showing past pages, etc.), a paging type 1218, and / or a short message 1220, etc. In cases where the relay UE 1202 has the UE identity of the target UE (e.g., target UE 1208) and the relay UE 1202 also knows that the pages (e.g., received in the paging relay request messages 1232) from the base station 1230 are dedicated to the target UE, the paging record 1212 can include the target UE identity 1214. Thereby, based on the target UE identity 1214, the target UE 1208 receiving the paging message 1204 can identify that there is a page for the target UE 1208 (e.g., from the base station 1230) or how many times the target UE 1208 has been paged, etc. The relay UE 1202 can also specify or indicate this information to the target UE 1208 in the paging message 1204 or in a separate message.

[0115] The paging message 1204 can include a subset of the paging records from the one or more paging relay request messages 1232 for the target UE 1208, e.g., in cases where the relay UE 1202 knows the target UE identity. On the other hand, in cases where the relay UE 1202 does not have the UE identity of the target UE or in cases where the relay UE 1202 does not know whether the pages in the received paging relay request messages 1232 are dedicated to the target UE 1208, the paging record 1212 can include a full or partial paging record 1216 listing one or more paging message(s) received by the relay UE 1202 from the base station over the Uu interface (e.g., received from the base station 1230 in the paging relay request messages 1232, etc.). Based on the full or partial paging record 1216, the target UE 1208 can be able to identify whether or how many times it has been paged, such as by looking up its UE identity or related information within the full or partial paging record 1216.

[0116] Paging Type Short Message (may be additional) RRC Setup triggered over Uu PRACH resources for random access RRC Setup triggered over sidelink Sidelink resources for unicast connection setup System Information Modification New System Information ETWS / CMAS Notification ETWS / CMAS Message

[0117] Table 3 - Examples of paging messages over sidelink communications

[0118] As shown by Figure 12 As shown in Table 3 above, the paging type 1218 within the paging record 1212 can indicate one or more types of the paging from the base station, such as whether the paging is to trigger RRC setup on the Uu interface, trigger RRC setup on the sidelink, system information modification, ETWS / CMAS notification, and / or emergency message / notification, etc. The short message 1220 within the paging record 1212 can include a message indicating PRACH resources for random access and a message indicating sidelink resources for unicast connection setup, such as described in connection with Table 1. Additionally, in the case where the paging type 1218 indicates that the paging from the base station (e.g., received from the base station 1230 in the paging relay request message 1232) is for system information modification, the short message 1220 can include new system information for the system information modification (e.g., update). Thereby, after the target UE 1208 receives the paging message 1204, the target UE 1208 can be able to apply the new system information if the new system information is dedicated to the target UE 1208. Similarly, in the case where the paging type 1218 indicates that the paging is for ETWS / CMAS notification, the short message 1220 can include the ETWS / CMAS message. Thereby, after the target UE receives the paging message 1204, the target UE 1208 can be able to obtain the message within the ETWS / CMAS notification if the ETWS / CMAS notification is dedicated to the target UE. By including the new system information and / or the ETWS / CMAS message in the paging record 1212 of the paging message 1204, the target UE 1208 can be able to obtain the new system information and / or the ETWS / CMAS message without reading SIBs from the base station.

[0119] Figure 13 is a communication flow 1300 illustrating an example of a base station transmitting a paging message or information to a target UE via a relay UE, in accordance with various aspects of the present disclosure. The numbering associated with the communication flow 1300 does not specify a particular timing sequence and is only used as a reference for the communication flow 1300.

[0120] At 1320, the base station 1306 can generate a paging relay request message 1308 that includes paging information 1310 for at least one target UE, such as the target UE 1304. The paging information 1310 can indicate at least a UE ID 1312 associated with the at least one target UE (e.g., the target UE 1304) and a paging type 1314. In one example, the base station 1306 can determine to generate the paging relay request message 1308 based on a request received from a network (e.g., an AMF of the network). In another example, the base station 1306 can determine to generate the paging relay request message 1308 based on its own determination (e.g., the base station 1306 determines to trigger an RRC setup with the target UE 1304).

[0121] At 1322, the base station 1306 can transmit the paging relay request message 1308 to the relay UE 1302, where the paging relay request message 1308 can indicate a request for the relay UE 1302 to relay the paging information to the target UE 1304 over a sidelink. The base station 1306 can transmit the paging relay request message 1308 to the relay UE 1302 over a PDSCH. In some examples, the paging relay request message 1308 can include paging information 1310 for multiple UEs (e.g., multiple target UEs). Additionally, the base station 1306 can indicate the paging type 1314 in the paging information 1310, which can be included in the paging relay request message 1308.

[0122] In one example, as shown at 1324 and as described in connection with Figure 12 the paging type 1314 can indicate at least one of a first paging type to trigger an RRC setup over a Uu interface, a second paging type to trigger an RRC setup over a sidelink interface (e.g., a PC5 interface), a third paging type for system information modification, a fourth paging type for ETWS notification, and / or a fifth paging type for CMAS notification, etc.

[0123] In another example, the base station 1306 can transmit / include one or more messages 1318 associated with the paging information 1310 for the relay UE 1302 in the paging relay request message 1302. For example, as shown at 1324, the one or more messages 1318 can include random access resources (e.g., PRACH resources) for the target UE 1304 to perform an RRC setup, sidelink resources for the target UE 1304 to perform a unicast connection setup, new system information, ETWS / CMAS related messages, and / or emergency related messages / indications, etc.

[0124] At 1326, the relay UE 1302 can transmit, over the sidelink, the paging message 1316 to the target UE 1304. The paging message 1316 can indicate the paging type 1314 and / or the one or more messages 1318 associated with the paging information 1310.

[0125] In some examples, as shown at 1328 and as discussed in connection with Figure 12 The paging relay request message 1308 can include one or more paging records, as discussed. As such, in a case where the relay UE 1302 detects that the UE ID 1312 of the target UE 1304 is included in the one or more paging records, the relay UE 1302 can transmit a dedicated paging message to the target UE 1304 based on at least one of the one or more paging records. Additionally, or alternatively, the relay UE 1302 can transmit the one or more paging records to the target UE 1304 in the paging message 1316 based on the relay UE 1302 not detecting the UE ID 1312 of the target UE 1304 in the one or more paging records.

[0126] At 1330, after receiving the paging message 1316 (e.g., a paging message including paging information 1310 indicating a paging type 1314 for a page from the base station 1306) from the relay UE 1302 over the sidelink, the target UE 1304 can receive information from the base station 1306 based on the paging type 1314 indicated in the paging message 1316 from the relay UE 1302. For example, in a case where the paging type 1314 indicates a system information modification, the target UE 1304 can receive new / updated system information from the base station 1306 at 1330. In another example, in a case where the paging type 1314 indicates an RRC setup, the target UE 1304 can receive information / resources associated with the RRC setup from the base station 1306 at 1330, etc.

[0127] Figure 14 is a flow diagram of a method of wireless communication 1400. In some examples, the method can be performed by a UE or component of a UE (which can be referred to as a relay UE or relay device) (e.g., the UE 104, 702; the RSU 107; the device 310 or 350; the relay UE 902, 1002, 1102, 1202, 1302; the device 1502). The method can help reduce latency in communications, improve reliability, and improve efficient use of wireless resources by relaying a page from a base station to a second UE over a sidelink.

[0128] At 1402, the first UE can receive, from a base station, a paging relay request message including paging information for at least a second UE, each paging information including a UE identity of the second UE and a paging type, such as described in connection with Figure 12 and 13 At 1322, the relay UE 1302 can receive, from the base station 1306, a paging relay request message 1308, where the paging relay request message 1308 can include the UE ID 1312 of the target UE 1304 and the paging type 1314. The reception of the paging relay request message can be performed by, for example, the paging relay request message component 1540 and / or the reception component 1530 of the device 1502 in Figure 15 The first UE receives the paging relay request message from the base station on a PDSCH.

[0129] In one example, the paging relay request message can include paging information for multiple UEs.

[0130] In another example, the first UE can indicate the paging type in a paging message transmitted by the first UE to the second UE on a sidelink. The paging type can indicate at least one of: a first paging type that triggers RRC setup on a Uu interface, or a second paging type that triggers RRC setup on a sidelink (e.g., PC5) interface, a third paging type for system information modification, a fourth paging type for ETWS notification, a fifth paging type for CMAS notification, or a sixth paging type for emergency messages or emergency notifications, such as described in connection with Table 1 and Figure 12 and 13

[0131] In another example, the first UE can receive, in the paging relay request message, paging information including a message associated with the paging information for the second UE. For example, the message associated with the paging information can include at least one of: a random access resource for the second UE to perform RRC setup, or a sidelink resource for the second UE to perform unicast connection setup.

[0132] At 1404, the first UE can transmit, from the first UE to the second UE on a sidelink, a paging message, such as described in connection with Figure 12 and Figure 13 At 1326, the relay UE 1302 can transmit, to the target UE 1304 on a sidelink, a paging message 1316. The transmission of the paging message can be performed by, for example, the paging message configuration component 1542 and / or the transmission component 1534 of the device 1502 in Figure 15

[0133] ​​In one example, the first UE can indicate a paging type in a paging message that the first UE transmits to a second UE on a sidelink. In such examples, the paging type can indicate at least one of: a first paging type that triggers RRC setup on a Uu interface, or a second paging type that triggers RRC setup on a sidelink interface, a third paging type for system information modification, a fourth paging type for ETWS notification, a fifth paging type for CMAS notification, or a sixth paging type for emergency messages or emergency notifications, such as described in connection with Figure 12 and 13

[0134] In another example, the paging relay request message can include one or more paging records (e.g., 1210), each paging record (e.g., 1212) can include a UE identity of a UE to which a page is directed (e.g., 1215) and a paging type (e.g., 1218), such as described in connection with Figure 12 In one example, in response to the first UE detecting that the UE identity of the second UE is included in the one or more paging records, the first UE can transmit a dedicated paging message to the second UE based on at least one of the one or more paging records. The first UE can subsequently transmit the one or more paging records to the second UE in a paging message based on the first UE not detecting the UE identity of the second UE in the one or more paging records. In other examples, the first UE can transmit an additional message to the second UE in the paging message, where the additional message can include at least one of: a random access resource for the second UE to perform RRC setup, or a sidelink resource for the second UE to perform unicast connection setup, such as described in connection with Table 1.

[0135] Figure 15 ​FIG. 15 is a diagram 1500 that is an example of a hardware implementation for the apparatus 1502. The apparatus 1502 can be a UE, a component of a UE, or can implement UE functionality. In some aspects, the apparatus 1502 can include a baseband processor 1504 (also referred to as a modem) coupled to a RF transceiver 1522. In some aspects, the apparatus 1502 can further include one or more Subscriber Identity Modules (SIM) cards 1520, an application processor 1506 coupled to a secure digital (SD) card 1508 and a screen 1510, a Bluetooth module 1512, a wireless local area network (WLAN) module 1514, a Global Positioning System (GPS) module 1516, or a power supply 1518. The baseband processor 1504 communicates through the RF transceiver 1522 with the UE 104 and / or BS 102 / 180. The baseband processor 1504 can include a computer- readable medium / memory. The computer-readable medium / memory can be non-transitory. The baseband processor 1504 is responsible for the general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the baseband processor 1504, causes the baseband processor 1504 to perform the various functions described supra. The computer-readable medium / memory can also be used for storing data that is manipulated by the baseband processor 1504 when executing software. The baseband processor 1504 further includes a reception component 1530, a communication manager 1532, and a transmission component 1534. The communication manager 1532 includes the one or more illustrated components. The components of the communication manager 1532 can be stored in the computer-readable medium / memory and / or configured as hardware within the baseband processor 1504. The baseband processor 1504 can be a component of the UE (e.g., of the device 350) and can include the memory 360 and / or at least one of the TX processor 368, the RX processor 356, and the controller / processor 359. In one configuration, the apparatus 1502 can be a modem chip and include only the baseband processor 1504, and in another configuration, the apparatus 1502 can be an entire UE (see, e.g., FIG. 3) and include the additional modules of the apparatus 1502. Figure 3

[0136] The communication manager 1532 includes a paging relay request message component 1540 configured to receive, from a base station, a paging relay request message including paging information for at least a second UE, each paging information including a UE identity of the second UE and a paging type, e.g., as described in connection with 1402 of FIG. 14. Figure 14 The communication manager 1532 further includes a paging message configuration component 1542 configured to transmit, from a first UE to a second UE over a sidelink, a paging message, e.g., as described in connection with 1404 of FIG. 14. Figure 14

[0137] The apparatus can include means for performing any of the methods described herein. Figure 14 ​​Each block of the algorithm in the flowchart or by Figure 12 The relay UE 1202 in the middle is an additional component of any of the aspects it performs. Thus, Figure 14 Each box in the flowchart or by Figure 12 Any of the aspects performed by the relay UE 1202 in the device can be performed by a component, and the device may include one or more of these components. These components may be one or more hardware components specifically configured to perform the process / algorithm, implemented by a processor configured to perform the process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0138] In one configuration, device 1502, and particularly cellular baseband processor 1504, includes: means for receiving from a base station a paging relay request message including paging information for at least a second UE, each paging message including the UE identity of the second UE and a paging type (e.g., paging relay request message component 1540 and / or receiving component 1530). Device 1502 includes means for transmitting the paging message from a first UE to a second UE on a side link (e.g., paging message configuration component 1542 and / or transmission component 1534).

[0139] The apparatus may be one or more of the components in device 1502 configured to perform the functions described by the apparatus. As described above, device 1502 may include TX processor 368, RX processor 356, and controller / processor 359. Thus, in one configuration, the apparatus may be TX processor 368, RX processor 356, and controller / processor 359 configured to perform the functions described by the apparatus.

[0140] Figure 16 This is a flowchart 1600 of a wireless communication method. In some examples, the method may be performed by a base station or a component of a base station (e.g., base stations 102, 180, 710, 1230, 1306; device 1702). This method can help reduce latency in communication, improve reliability, and improve the efficient use of radio resources by relaying paging from the base station to the target UE on a side link.

[0141] At point 1602, the base station can generate a paging relay request message including paging information for at least the second UE, which may indicate the UE ID of the second UE and the paging type, such as combining... Figure 13As described. For example, at 1320, the base station 1306 can generate a paging relay request message 1308 including paging information 1310 for at least one target UE, where the paging information 1310 can indicate a UE ID 1312 associated with the target UE and a paging type 1314. The generation of the paging relay request message can be performed by, for example, Figure 17 the paging relay request message generation component 1740 of the device 1702 in FIG. 17.

[0142] At 1604, the base station can transmit, to a first UE, a paging relay request message indicating a request for the first UE to relay paging information to a second UE over a sidelink, such as described in connection with Figure 12 and 13 As described. For example, at 1322, the base station 1306 can transmit, to the relay UE 1302, the paging relay request message 1308, where the paging relay request message 1322 can indicate a request for the relay UE 1302 to relay paging information to the target UE 1304 over a sidelink. The generation of the paging relay request message can be performed by, for example, Figure 17 the paging relay request message configuration component 1742 and / or the transmission component 1734 of the device 1702 in FIG. 17. The base station can transmit, to a first UE, a paging relay request message over a PDSCH. The paging relay request message can include paging information for a plurality of UEs.

[0143] In one example, the base station can indicate a paging type in the paging information included in the paging relay request message. For example, the paging type indicates at least one of: a first paging type that triggers RRC setup over a Uu interface, or a second paging type that triggers RRC setup over a sidelink (e.g., PC5) interface, a third paging type for system information modification, a fourth paging type for ETWS notification, a fifth paging type for CMAS notification, or a sixth paging type for emergency messages or emergency notifications, such as described in connection with Figure 12 and 13 As described.

[0144] In another example, the base station transmits, in a paging relay request message, a message related to paging information for a first UE, where the message associated with the paging information can include at least one of: a random access resource for a second UE to perform RRC setup, or a sidelink resource for the second UE to perform unicast connection setup, such as described in connection with Figure 12 and 13 and Table 1.

[0145] Figure 17is an example of a diagram 1700 illustrating hardware implementation for the apparatus 1702. The apparatus 1702 is a BS and includes a baseband unit 1704. The baseband unit 1704 can communicate through a cellular RF transceiver with the UEs 104. The baseband unit 1704 can include a computer- readable medium / memory. The baseband unit 1704 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the baseband unit 1704, causes the baseband unit 1704 to perform the various functions described supra. The computer-readable medium / memory can also be used for storing data manipulated by the baseband unit 1704 when executing software. The baseband unit 1704 further includes a reception component 1730, a communication manager 1732, and a transmission component 1734. The communication manager 1732 includes the one or more illustrated components. The components of the communication manager 1732 can be stored in the computer-readable medium / memory and / or configured as hardware within the baseband unit 1704. The baseband unit 1704 can be a component of the device 310 and can include the memory 376 and / or at least one of the TX processor 316, the RX processor 370, and the controller / processor 375.

[0146] The communication manager 1732 includes a paging relay request message generation component 1740 configured to generate a paging relay request message including paging information for at least a second UE, the paging information indicating a UE ID of the second UE and a paging type, e.g., as described in connection with 1602 of Figure 16 The communication manager 1732 further includes a paging relay request message configuration component 1742 configured to transmit, to a first UE, a paging relay request message indicating a request for the first UE to relay, on a sidelink, the paging information to the second UE, e.g., as described in connection with 1604 of Figure 16

[0147] The apparatus can include means for performing each of the blocks of the algorithm in the flowchart of Figure 16 The apparatus can include means for performing each of the blocks of the algorithm in the flowchart of Figure 7 , 12 and 13. In this regard, each block in the flowchart of Figure 16 The apparatus can include means for performing each of the blocks of the algorithm in the flowchart of Figure 7 , 12 and 13. In this regard, each block in the flowchart of ​

[0148] In one configuration, the apparatus 1702, and in particular the baseband unit 1704, includes means for generating a paging relay request message including paging information for at least a second UE, the paging information indicating a UE ID of the second UE and a paging type (e.g., paging relay request message generation component 1740). The apparatus 1702 includes means for transmitting, to a first UE, the paging relay request message indicating a request for the first UE to relay the paging information to the second UE over a sidelink (e.g., paging relay request message configuration component 1742 and / or transmission component 1734).

[0149] The apparatus can be one or more of the components of the apparatus 1702 configured to perform the functions recited by the apparatus. As described supra, the apparatus 1702 can include the TX processor 316, the RX processor 370, and the controller / processor 375. As such, in one configuration, the apparatus can be the TX processor 316, the RX processor 370, and the controller / processor 375 configured to perform the functions recited by the apparatus.

[0150] Figure 18 is a flow diagram 1800 of a method of wireless communication. In some examples, the method can be performed by a UE or component of a UE, which can be referred to as a target (e.g., target UE 1208, 1208; apparatus 1902). The method can help reduce latency in communications, improve reliability, and improve efficient use of wireless resources by relaying a page from a base station to a second UE over a sidelink.

[0151] At 1802, the second UE can receive, from a first UE over a sidelink, a page message including paging information indicating a paging type for a page from a base station, such as described in connection with Figure 12 and 13 For example, at 1326, the target UE 1304 can receive the page message 1316 from the relay UE 1302, where the page message 1316 can include the paging information 1310 and the paging type 1314. The reception of the page message can be performed by, for example, the paging message process component 1940 and / or the reception component 1930 of the apparatus 1902 in Figure 19

[0152] In one example, the paging type can indicate at least one of: a first paging type triggering RRC setup over a Uu interface, or a second paging type triggering RRC setup over a sidelink interface, a third paging type for system information modification, a fourth paging type for ETWS notification, a fifth paging type for CMAS notification, or a sixth paging type for emergency messages or emergency notifications.

[0153] ​At 1804, the second UE can receive information from the base station based on the paging type indicated in the paging message from the first UE, such as described in connection with Figure 12 and 13 At 1330, the target UE 1304 can receive, from the base station 1306, additional information associated with the paging type 1314. The reception of this information can be performed by, for example, the paging information process component 1942 and / or the reception component 1930 of the device 1902 in Figure 19

[0154] In one example, the second UE can receive an additional message in the paging message from the first UE, where the additional message can include at least one of: a random access resource for the second UE to perform RRC setup, or a sidelink resource for the second UE to perform unicast connection setup, such as described in connection with Figure 12 and Table 1.

[0155] Figure 19 ​is an example of a diagram 1900 illustrating hardware implementation for the apparatus 1902. The apparatus 1902 can be a UE, a component of a UE, or can implement UE functionality. In some aspects, the apparatus 1902 can include a baseband processor 1904 (also referred to as a modem) coupled to a RF transceiver 1922. In some aspects, the apparatus 1902 can further include one or more Subscriber Identity Modules (SIM) cards 1920, an application processor 1906 coupled to a secure digital (SD) card 1908 and a screen 1910, a Bluetooth module 1912, a wireless local area network (WLAN) module 1914, a Global Positioning System (GPS) module 1916, or a power supply 1918. The baseband processor 1904 communicates with the UE 104 and / or BS 102 / 180 by way of the RF transceiver 1922. The baseband processor 1904 can include a computer-readable medium / memory. The computer- readable medium / memory can be non-transitory. The baseband processor 1904 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the baseband processor 1904, causes the baseband processor 1904 to perform the various functions described supra. The computer-readable medium / memory can also be used for storing data that is manipulated by the baseband processor 1904 when executing software. The baseband processor 1904 further includes a reception component 1930, a communication manager 1932, and a transmission component 1934. The communication manager 1932 includes the one or more illustrated components. The components of the communication manager 1932 can be stored in the computer-readable medium / memory and / or configured as hardware within the baseband processor 1904. The baseband processor 1904 can be a component of the UE (e.g., of the device 350) and can include the memory 360 and / or at least one of the TX processor 368, the RX processor 356, and the controller / processor 359. In one configuration, the apparatus 1902 can be a modem chip and include only the baseband processor 1904, and in another configuration, the apparatus 1902 can be an entire UE (e.g., see 350) and include the additional modules of the apparatus 1902. Figure 3

[0156] The communication manager 1932 includes a paging message process component 1940 configured to receive, from a first UE on a sidelink, a paging message including paging information indicating a paging type for a page from a base station, e.g., as described in connection with 1802. The communication manager 1932 further includes a paging information process component 1942 configured to receive information from the base station based on the paging type indicated in the paging message from the first UE, e.g., as described in connection with 1804. Figure 18 Figure 18

[0157] The apparatus can include means for performing any of the methods described herein. Figure 18 ​​​each block in the flowcharts or any aspects of the subject matter recited in Figure 12 and 13 may be performed by one or more of the components of the device. The device can include one or more of these components. These components can be one or more hardware components specifically configured to carry out the stated processes / algorithm, implemented by a processor configured to perform the stated processes / algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof. Figure 18 each block in the flowcharts or any aspects of the subject matter recited in Figure 12 and 13 may be performed by one or more of the components of the device. The device can include one or more of these components. These components can be one or more hardware components specifically configured to carry out the stated processes / algorithm, implemented by a processor configured to perform the stated processes / algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.

[0158] In one configuration, the apparatus 1802, and in particular the baseband processor 1804, includes means for receiving a paging message from a first UE on a sidelink, the paging message including paging information indicating a paging type for a page from a base station (e.g., the paging message process component 1940 and / or the reception component 1930). The apparatus 1802 includes means for receiving information from the base station based on the paging type indicated in the paging message from the first UE (e.g., the paging information process component 1942 and / or the reception component 1930).

[0159] The means can be one or more of the components of the device 1902 configured to perform the functions recited by the means. As described supra, the device 1902 can include the TX processor 368, the RX processor 356, and the controller / processor 359. As such, in one configuration, the means can be the TX processor 368, the RX processor 356, and the controller / processor 359 configured to perform the functions recited by the means.

[0160] Figure 20 is a flowchart 2000 of a wireless communication method. In some examples, the method can be performed by a first UE (which can be referred to as a relay UE or a relay device) (e.g., the UE 104, the RSU 107, the device 310 or 350, the UE 702, the relay UE 902, 1002, 1102, or 1202; the apparatus 2102). The method can help reduce latency, improve reliability, and improve efficient use of wireless resources in communications by relaying a page from a base station to a second UE on a sidelink.

[0161] At 2002, the first UE can receive, from a base station, a page relay request message including paging information for a second UE, such as described in connection with Figure 12As described. For example, the relay UE 1202 can receive a page relay request message 1232 from the base station 1230. The first UE receives the page relay request message from the base station on a PDSCH.

[0162] In one configuration, the first UE can receive the page information in a page relay request message that includes a page type. In such a configuration, the page type can indicate at least one of a first page type that triggers RRC setup on a Uu interface, or a second page type that triggers RRC setup on a PC5 interface, a third page type for system information modification, a fourth page type for ETWS notification, or a fifth page type for CMAS notification, such as described in connection with Table 1.

[0163] In another configuration, the first UE can receive the page information in a page relay request message that includes a message associated with the page information for the second UE. In such a configuration, the message associated with the page information can include at least one of a random access resource for the second UE to perform RRC setup, or a sidelink resource for the second UE to perform unicast connection setup.

[0164] At 2004, the first UE can transmit, from the first UE to the second UE on a sidelink, a page message (e.g., 1204), such as described in connection with Figure 12 For example, the relay UE 1202 can transmit the page message 1204 to the target UE 1208 on a sidelink 1206.

[0165] In one configuration, the first UE can indicate a page type in a page message transmitted by the first UE to the second UE on a sidelink. In such a configuration, the page type can indicate at least one of a first page type that triggers RRC setup on a Uu interface, or a second page type that triggers RRC setup on a PC5 interface, a third page type for system information modification, a fourth page type for ETWS notification, or a fifth page type for CMAS notification, such as described in connection with Figure 12 As described.

[0166] In another configuration, the page relay request message can include one or more page records (e.g., 1210), each page record (e.g., 1212) can include a UE identity (e.g., 1214) of a UE to which a page is directed and a page type (e.g., 1218), such as described in connection with Figure 12The described. In such configurations, the first UE can transmit a dedicated paging message to the second UE based on at least one of the one or more paging records in a case where the first UE detects that a UE identity of the second UE is included in the one or more paging records. The first UE can then transmit the one or more paging records to the second UE in a paging message in a case where the first UE does not detect the UE identity of the second UE in the one or more paging records. In such configurations, the first UE can transmit an additional message to the second UE in the paging message, where the additional message can include at least one of: a random access resource for the second UE to perform RRC setup, or a sidelink resource for the second UE to perform unicast connection setup, such as described in connection with Table 1.

[0167] Figure 21 FIG. 10 is a diagram 1000 illustrating an example of a hardware implementation for the device 2102. The device 2102, which can be a UE or other wireless device that communicates based on sidelinks, includes a baseband processor 2104 (also referred to as a modem) coupled to a RF transceiver 2122 and one or more subscriber identity modules (SIM) cards 2120, an application processor 2106 coupled to a secure digital (SD) card 2108 and a screen 2110, a Bluetooth module 2112, a wireless local area network (WLAN) module 2114, a global positioning system (GPS) module 2116, and a power supply 2118. The baseband processor 2104 communicates with the UE 104 and / or BS 102 / 180 through the RF transceiver 2122. The baseband processor 2104 can include a computer-readable medium / memory. The computer-readable medium / memory can be non-transitory. The baseband processor 2104 is responsible for the general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the baseband processor 2104, causes the baseband processor 2104 to perform the various functions described supra. The computer-readable medium / memory can also be used for storing data that is manipulated by the baseband processor 2104 when executing software. The baseband processor 2104 further includes a reception component 2130, a communication manager 2132, and a transmission component 2134. The communication manager 2132 includes the one or more illustrated components. The components within the communication manager 2132 can be stored in the computer-readable medium / memory and / or configured as hardware within the baseband processor 2104. The baseband processor 2104 can be a component of the device 350 and can include the memory 360 and / or at least one of the TX processor 368, the RX processor 356, and the controller / processor 359. In one configuration, the device 2102 can be a modem chip and include only the baseband processor 2104, and in another configuration, the device 2102 can be an entire UE (e.g., see FIG. 9) and include the memory 360, the TX processor 368, the RX processor 356, and the controller / processor 359. In another configuration, the device 2102 can be a modem platform and include the memory 360, the TX processor 368, the RX processor 356, and the controller / processor 359, but not the application processor 2106. Figure 3(350) and includes additional modules for device 2102.

[0168] Communication manager 2132 includes a relay receiving component 2140 configured to receive a paging relay request message from a base station, including paging information for a second UE, for example, as combined with Figure 20 As described in 2002. The communication manager 2132 further includes a relay transmission component 2142 configured to transmit paging messages from the first UE to the second UE on a side link, for example, as in combination with... Figure 20 As described in 2004.

[0169] The device may include execution Figure 20 Each block of the algorithm in the aforementioned flowchart or by Figure 12 The relay UE1202 in the middle is an additional component of any of the aspects it performs. Thus, Figure 20 Each box in the aforementioned flowchart or by Figure 12 Any aspect performed by the relay UE 1202 can be performed by a component, and the device may include one or more of these components. These components may be one or more hardware components specifically configured to perform the process / algorithm, implemented by a processor configured to perform the process / algorithm, stored in a computer-readable medium for processor implementation, or some combination thereof. In one configuration, device 2402, and in particular cellular baseband processor 2404, includes means for receiving a paging relay request message from a base station, including paging information for a second UE (e.g., relay receiving component 2140, receiving component 2130, and / or RF transceiver 2122). Device 2402 includes means for transmitting paging messages from the first UE to the second UE on a side link (e.g., relay transmission component 2142, transmission component 2134, and / or RF transceiver 2122). The aforementioned means may be one or more of the aforementioned components in device 2102 configured to perform the functions described by the aforementioned means. As described above, device 2102 may include TX processor 368, RX processor 356, and controller / processor 359. Thus, in one configuration, the aforementioned device may be TX processor 368, RX processor 356, and controller / processor 359 configured to perform the functions described herein.

[0170] Figure 22 This is a flowchart 2200 of a wireless communication method. In some examples, the method may be performed by a base station (e.g., base station 102, 180, 710, 1230; device 2302). This method can help reduce latency in communication, improve reliability, and improve the efficient use of radio resources by relaying paging from the base station to the target UE on a side link.

[0171] At 2202, the base station can determine to page a first UE in an inactive state or an idle state, such as described in connection with Figure 6

[0172] At 2204, the base station can transmit, to a second UE, a paging relay request message including paging information, the paging relay request message indicating a request for the second UE to relay the paging information to the first UE over a sidelink, such as described in connection with Figure 12

[0173] In one configuration, the base station can indicate a paging type in the paging information included in the paging relay request message. In such a configuration, the paging type indicates at least one of: a first paging type that triggers RRC setup over a Uu interface, or a second paging type that triggers RRC setup over a PC5 interface, a third paging type for system information modification, a fourth paging type for ETWS notification, or a fifth paging type for CMAS notification, such as described in connection with Figure 12

[0174] In another configuration, the base station transmits, in the paging relay request message, a message related to paging information for the second UE, where the message associated with the paging information can include at least one of: a random access resource for the first UE to perform RRC setup, or a sidelink resource for the first UE to perform unicast connection setup, such as described in connection with Figure 23 and Table 1.

[0175] Figure 22 ​​​is an example of a diagram 2300 that illustrates hardware implementation for the apparatus 2302. The apparatus 2302 is a BS and includes a baseband unit 2304. The baseband unit 2304 can communicate through a cellular RF transceiver with the UE 104. The baseband unit 2304 can include a computer- readable medium / memory. The baseband unit 2304 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the baseband unit 2304, causes the baseband unit 2304 to perform the various functions described supra. The computer-readable medium / memory can also be used for storing data manipulated by the baseband unit 2304 when executing software. The baseband unit 2304 further includes a reception component 2330, a communication manager 2332, and a transmission component 2334. The communication manager 2332 includes the one or more illustrated components. The components of the communication manager 2332 can be stored in the computer-readable medium / memory and / or configured as hardware within the baseband unit 2304. The baseband unit 2304 can be a component of the device 310 and can include the memory 376 and / or at least one of the TX processor 316, the RX processor 370, and the controller / processor 375.

[0176] The communication manager 2332 includes a paging component 2340 configured to determine to page a first UE that is in an inactive state or an idle state, e.g., as described in connection with 2202 in FIG. 22. The communication manager 2332 further includes a target UE component 2342 configured to transmit, to a second UE, a paging relay request message including paging information, the paging relay request message indicating a request for the second UE to relay the paging information to the first UE over a sidelink, e.g., as described in connection with 2204 in FIG. 22. Figure 22 Figure 22 The apparatus can include additional components that perform each of the blocks of the algorithm in the aforementioned flowchart of FIG. 22, as well as

[0177] The apparatus can include additional components that perform each of the blocks of the algorithm in the aforementioned flowchart of FIG. 22, as well as Figure 7 any of the aspects of the base station 710, 1230 in FIGS. 7 and 12. As such, Figure 22 The apparatus can include additional components that perform each of the blocks of the algorithm in the aforementioned flowchart of FIG. 22, as well as 12 The apparatus can include additional components that perform each of the blocks of the algorithm in the aforementioned flowchart of FIG. 22, as well as Figure 7 The apparatus can include additional components that perform each of the blocks of the algorithm in the aforementioned flowchart of FIG. 22, as well as Figure 24 The apparatus can include additional components that perform each of the blocks of the algorithm in the aforementioned flowchart of FIG. 22, as well as 12 ​Any of the aspects performed by the base stations 710, 1230 in can be performed by a component and the device can include one or more of those components. The components can be one or more hardware components specifically configured to carry out the stated processes / algorithm, implemented by a processor configured to perform the stated processes / algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof. In one configuration, the device 2302, and in particular the baseband unit 2304, includes means for determining to page a first UE in an inactive state or an idle state (e.g., a paging component 2340 of the communications manager 2332). The device 2302 includes means for transmitting, to a second UE, a paging relay request message including paging information, the paging relay request message indicating a request for the second UE to relay the paging information to the first UE over a sidelink (e.g., a relay request component 2342 of the communications manager 2332 and / or a transmission component 2334 of the baseband unit 2304). The aforementioned means can be one or more of the aforementioned components of the device 2302 configured to perform the functions recited by the aforementioned means. As described supra, the device 2302 can include the TX processor 316, the RX processor 370, and the controller / processor 375. As such, in one configuration, the aforementioned means can be the TX processor 316, the RX processor 370, and the controller / processor 375 configured to perform the functions recited by the aforementioned means.

[0178] Figure 12 is a flowchart 2400 of a method of wireless communication. In some examples, the method can be performed by a first UE (which can be referred to as a target) (e.g., the target UE 1208; the device 2502). The method can help reduce latency, improve reliability, and improve efficient use of wireless resources in communications by relaying a page from a base station to the first UE over a sidelink.

[0179] At 2402, the first UE can receive, from a second UE (e.g., the relay UE 1202) over a sidelink, a page message including paging information indicating a paging type for a page from a base station (e.g., the base station 1230), such as described in connection with Figure 12 The paging type can indicate at least one of a first paging type triggering RRC setup over a Uu interface, a second paging type triggering RRC setup over a PC5 interface, a third paging type for system information modification, a fourth paging type for ETWS notification, or a fifth paging type for CMAS notification, for example.

[0180] At 2404, the first UE can receive information from the base station based on the paging type indicated in the page message from the second UE, such as described in connection with Figure 12described. For example, the first UE can receive an additional message in a paging message from the second UE, where the additional message includes at least one of: a random access resource for the first UE to perform RRC setup, or a sidelink resource for the first UE to perform unicast connection setup, such as described in connection with Figure 25 and Table 1.

[0181] Figure 3 diagram 2500 is an example of a hardware implementation for the apparatus 2502. The apparatus 2502 can be a UE or other wireless device that communicates based on sidelinks. The apparatus 2502 includes a baseband processor 2504 (also referred to as a modem) coupled with a cellular RF transceiver 2522 and one or more subscriber identity modules (SIM) cards 2520, an application processor 2506 coupled with a secure digital (SD) card 2508 and a screen 2510, a Bluetooth module 2512, a wireless local area network (WLAN) module 2514, a Global Positioning System (GPS) module 2516, and a power supply 2518. The baseband processor 2504 communicates with the UEs 104 and / or BSs 102 / 180 by the RF transceiver 2522. The baseband processor 2504 can include a computer- readable medium / memory. The computer-readable medium / memory can be non-transitory. The baseband processor 2504 is responsible for the general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the baseband processor 2504, causes the baseband processor 2504 to perform the various functions described supra. The computer-readable medium / memory can also be used for storing data that is manipulated by the baseband processor 2504 when executing software. The baseband processor 2504 further includes a reception component 2530, a communication manager 2532, and a transmission component 2534. The communication manager 2532 includes the one or more illustrated components. The components of the communication manager 2532 can be stored in the computer-readable medium / memory and / or configured as hardware within the baseband processor 2504. The baseband processor 2504 can be a component of the device 350 and can include the memory 360 and / or at least one of the TX processor 368, the RX processor 356, and the controller / processor 359. In one configuration, the apparatus 2502 can be a modem chip and include only the baseband processor 2504, and in another configuration, the apparatus 2502 can be an entire UE (e.g., see 350 of FIG. 3) and include the additional modules of the apparatus 2502. Figure 24 of FIG. 3).

[0182] The communication manager 2532 includes a paging reception component 2540 configured to receive, from a second UE on a sidelink, a paging message including paging information indicating a paging type for a page from a base station, e.g., as described in connection with Figure 24As described in 2402. The communication manager 2532 further includes an information component 2542 configured to receive information from the base station based on the paging type indicated in the paging message from the second UE, for example, as combined with... Figure 24 As described in 2404.

[0183] The device may include execution Figure 12 Each block of the algorithm in the aforementioned flowchart or by Figure 24 The additional components of any aspect of the target UE1208's execution. Thus, Figure 12 Each box in the aforementioned flowchart or by ​ Any aspect performed by the target UE 1208 can be performed by a component, and the device may include one or more of these components. These components may be one or more hardware components specifically configured to perform the process / algorithm, implemented by a processor configured to perform the process / algorithm, stored in a computer-readable medium for processor implementation, or some combination thereof. In one configuration, device 2402, and in particular baseband processor 2404, includes means for receiving paging messages from a second UE on a side link (e.g., paging receiving component 2540, receiving component 2530, and / or RF transceiver 2522), the paging message including paging information indicating the paging type for a paging from a base station. Device 2402 includes means for receiving information from a base station based on the paging type indicated in the paging message from the second UE (e.g., information component 2542, receiving component 2530, and / or RF transceiver 2522). The aforementioned means may be one or more of the aforementioned components in device 2502 configured to perform the functions described by the aforementioned means. As described above, device 2502 may include TX processor 368, RX processor 356, and controller / processor 359. Thus, in one configuration, the aforementioned device may be TX processor 368, RX processor 356, and controller / processor 359 configured to perform the functions described herein.

[0184] The following aspects are illustrative only and may be combined with other aspects or teachings described herein without limitation.

[0185] Aspect 1 is a method for wireless communication at a first UE, comprising: receiving a paging relay request message from a base station including paging information for a second UE; and transmitting a paging message from the first UE to the second UE on a side link.

[0186] In aspect 2, the method of aspect 1 further includes: the first UE receiving paging information including the paging type in the paging relay request message.

[0187] In Aspect 3, the method of Aspect 1 or Aspect 2 further includes that the paging type indicates at least one of: a first paging type that triggers RRC setup on a Uu interface, or a second paging type that triggers RRC setup on a PC5 interface, a third paging type for system information modification, a fourth paging type for ETWS notification, or a fifth paging type for CMAS notification.

[0188] In Aspect 4, the method of any of Aspects 1-3 further includes that the first UE receives, in the paging relay request message, the paging information including a message associated with the paging information for the second UE.

[0189] In Aspect 5, the method of any of Aspects 1-4 further includes that the message associated with the paging information includes at least one of: a random access resource for the second UE to perform RRC setup, or a sidelink resource for the second UE to perform unicast connection setup.

[0190] In Aspect 6, the method of any of Aspects 1-5 further includes that the first UE receives the paging relay request message from the base station on a PDSCH.

[0191] In Aspect 7, the method of any of Aspects 1-6 further includes indicating a paging type in the paging message transmitted by the first UE to the second UE on the sidelink.

[0192] In Aspect 8, the method of any of Aspects 1-7 further includes that the paging type indicates at least one of: a first paging type that triggers RRC setup on a Uu interface, or a second paging type that triggers RRC setup on a PC5 interface, a third paging type for system information modification, a fourth paging type for ETWS notification, or a fifth paging type for CMAS notification.

[0193] In Aspect 9, the method of any of Aspects 1-8 further includes that the paging relay request message includes one or more (or a list of) paging records, each paging record including a UE identity of a UE that the paging is directed to and the paging type, the method further includes: transmitting, to the second UE, a dedicated paging message based on at least one of the one or more paging records in a case that the first UE detects that the UE identity of the second UE is included in the one or more paging records; and transmitting, to the second UE, the one or more paging records in the paging message in a case that the first UE does not detect the UE identity of the second UE in the one or more paging records.

[0194] In aspect 10, the method of any of aspects 1-9 further includes that the first UE transmits, to the second UE in the paging message, an additional message.

[0195] In aspect 11, the method of any of aspects 1-10 further includes that the additional message includes at least one of: a random access resource for the second UE to perform RRC setup, or a sidelink resource for the second UE to perform unicast connection setup.

[0196] Aspect 12 is an apparatus for wireless communication at a first UE, comprising: means for receiving, from a base station, a paging relay request message including paging information for a second UE; and means for transmitting, from the first UE to the second UE on a sidelink, a paging message.

[0197] In aspect 13, the apparatus of aspect 12 further includes means for performing the method of any of aspects 2-11.

[0198] Aspect 14 is an apparatus for wireless communication at a first UE, the apparatus comprising: a memory; and at least one processor coupled to the memory and configured to perform the method of any of aspects 1-11.

[0199] Aspect 15 is a non-transitory computer-readable storage medium storing computer executable code for wireless communication at a first UE, the code when executed by a processor cause the processor to perform the method of any of aspects 1-11.

[0200] Aspect 16 is a method of wireless communication at a base station, comprising: determining to page a first UE in an inactive state or an idle state; and transmitting, to a second UE, a paging relay request message including paging information, the paging relay request message indicating a request for the second UE to relay the paging information to the first UE on a sidelink.

[0201] In aspect 17, the method of aspect 16 further includes that the base station indicates a paging type in the paging information included in the paging relay request message.

[0202] In aspect 18, the method of aspect 16 or aspect 17 further includes that the paging type indicates at least one of: a first paging type to trigger RRC setup on a Uu interface, or a second paging type to trigger RRC setup on a PC5 interface, a third paging type for system information modification, a fourth paging type for ETWS notification, or a fifth paging type for CMAS notification.

[0203] In aspect 19, the method of any of aspects 16-18 further includes that the base station transmits a message associated with the paging information for the second UE in the paging relay request message.

[0204] In aspect 20, the method of any of aspects 16-19 further includes that the message associated with the paging information includes at least one of: a random access resource for the first UE to perform RRC setup, or a sidelink resource for the first UE to perform unicast connection setup.

[0205] In aspect 21, the method of any of aspects 16-20 further includes that the base station transmits the paging relay request message to the second UE on a PDSCH.

[0206] Aspect 22 is an apparatus for wireless communication at a base station, comprising: means for determining that a first UE in an inactive state or an idle state is to be paged; and means for transmitting, to a second UE, a paging relay request message including paging information, the paging relay request message indicating a request for the second UE to relay paging information to the first UE on a sidelink.

[0207] In aspect 23, the apparatus of aspect 22 further includes means for performing the method of any of aspects 17-21.

[0208] Aspect 24 is an apparatus for wireless communication at a base station, comprising: a memory; and at least one processor coupled to the memory and configured to perform the method of any of aspects 16-21.

[0209] Aspect 25 is a non-transitory computer-readable storage medium storing computer-executable code for wireless communication at a base station, the code when executed by a processor cause the processor to perform the method of any of aspects 16-21.

[0210] Aspect 26 is a method of wireless communication at a first UE, comprising: receiving, from a second UE on a sidelink, a paging message including paging information indicating a paging type for a page from a base station; and receiving information from the base station based on the paging type indicated in the paging message from the second UE.

[0211] In aspect 27, the method of aspect 26 further includes that the paging type indicates at least one of: a first paging type triggering RRC setup on a Uu interface, or a second paging type triggering RRC setup on a PC5 interface, a third paging type for system information modification, a fourth paging type for ETWS notification, or a fifth paging type for CMAS notification.

[0212] In aspect 28, the method of aspect 26 or aspect 27 further includes that the first UE receives an additional message in the paging message from the second UE.

[0213] In aspect 29, the method of any of aspects 26-28 further includes that the additional message includes at least one of: a random access resource for the first UE to perform RRC setup, or a sidelink resource for the first UE to perform unicast connection setup.

[0214] Aspect 30 is an apparatus for wireless communication at a base station, comprising: means for receiving a paging message from a second UE on a sidelink, the paging message including paging information indicating a paging type for a page from the base station; and means for receiving information from the base station based on the paging type indicated in the paging message from the second UE.

[0215] In aspect 31, the apparatus of aspect 30 further includes means for performing the method of any of aspects 27-29.

[0216] Aspect 32 is an apparatus for wireless communication, comprising: a memory; and at least one processor coupled to the memory and configured to perform the method of any of aspects 26-29.

[0217] Aspect 33 is a non-transitory computer-readable storage medium storing computer executable code for wireless communication at a base station, the code when executed by a processor cause the processor to perform the method of any of aspects 26-29.

[0218] Aspect 34 is an apparatus for wireless communication, comprising: a memory; and at least one processor coupled with the memory, the memory and the at least one processor configured to: receive, from a base station, a paging relay request message including paging information for at least a second UE, each paging information including a UE identity of the second UE and a paging type; and transmit, from the first UE to the second UE on a sidelink, a paging message.

[0219] Aspect 35 is the apparatus of aspect 34, wherein the paging relay request message includes the paging information for a plurality of UEs.

[0220] Aspect 36 is the apparatus of any of aspects 34 and 35, wherein the at least one processor and the memory are further configured to: indicate the paging type in the paging message transmitted by the first UE to the second UE on the sidelink.

[0221] Aspect 37 is the apparatus of any of aspects 34 through 36, wherein the paging type indicates at least one of: a first paging type that triggers RRC setup on a Uu interface, a second paging type that triggers RRC setup on a sidelink interface, a third paging type for system information modification, a fourth paging type for ETWS notification, a fifth paging type for CMAS notification, or a sixth paging type for emergency messages or emergency notifications.

[0222] Aspect 38 is the apparatus of any of aspects 34 through 37, wherein the paging relay request message includes one or more paging records, the at least one processor and the memory are further configured to: transmit, to the second UE, a dedicated paging message based on at least one paging record of the one or more paging records in response to the first UE detecting that the UE identity of the second UE is included in the one or more paging records; and transmit, to the second UE in the paging message, the one or more paging records based on the first UE not detecting the UE identity of the second UE in the one or more paging records.

[0223] Aspect 39 is the apparatus of any of aspects 34 through 38, wherein the at least one processor and the memory are further configured to: receive, in the paging relay request message, the paging information including a message associated with the paging information for the second UE.

[0224] Aspect 40 is the apparatus of any of aspects 34 through 39, wherein the message associated with the paging information includes at least one of: a random access resource for the second UE to perform RRC setup, or a sidelink resource for the second UE to perform unicast connection setup.

[0225] Aspect 41 is the apparatus of any of aspects 34 through 40, wherein the at least one processor and the memory are further configured to: receive the paging relay request message from the base station on a PDSCH.

[0226] Aspect 42 is the apparatus of any of aspects 34 through 41, wherein the at least one processor and the memory are further configured to: transmit, to the second UE in the paging message, an additional message.

[0227] Aspect 43 is the apparatus of any of aspects 34 through 42, wherein the additional message includes at least one of: a random access resource for the second UE to perform RRC setup, or a sidelink resource for the second UE to perform unicast connection setup.

[0228] Aspect 44 is a method of wireless communication for implementing any of aspects 34 through 43.

[0229] Aspect 45 is an apparatus for wireless communication including means for implementing any of aspects 34 to 43.

[0230] Aspect 46 is a computer-readable medium storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 34 to 43.

[0231] Aspect 47 is an apparatus for wireless communication including a memory and at least one processor coupled with the memory, the memory and the at least one processor being configured to generate a paging relay request message including paging information for at least a second UE, the paging information indicating a UE ID of the second UE and a paging type, and transmit, to a first UE, the paging relay request message indicating a request for the first UE to relay the paging information to the second UE over a sidelink.

[0232] Aspect 48 is the apparatus of aspect 47, where the paging relay request message includes the paging information for a plurality of UEs.

[0233] Aspect 49 is the apparatus of any of aspects 47 and 48, where the at least one processor and the memory are further configured to indicate the paging type in the paging information included in the paging relay request message.

[0234] Aspect 50 is the apparatus of any of aspects 47 to 49, where the paging type indicates at least one of a first paging type triggering RRC setup over a Uu interface, a second paging type triggering RRC setup over a sidelink interface, a third paging type for system information modification, a fourth paging type for ETWS notification, a fifth paging type for CMAS notification, or a sixth paging type for emergency messages or emergency notifications.

[0235] Aspect 51 is the apparatus of any of aspects 47 to 50, where the at least one processor and the memory are further configured to transmit a message associated with the paging information for the first UE in the paging relay request message.

[0236] Aspect 52 is the apparatus of any of aspects 47 to 51, where the message associated with the paging information includes at least one of a random access resource for the second UE to perform RRC setup or a sidelink resource for the second UE to perform unicast connection setup.

[0237] Aspect 53 is the apparatus of any of aspects 47 to 52, where the at least one processor and the memory are further configured to transmit the paging relay request message to the first UE over a PDSCH.

[0238] Aspect 54 is a method of wireless communication for implementing any of aspects 47 through 53.

[0239] Aspect 55 is an apparatus for wireless communication, comprising means for implementing any of aspects 47 through 53.

[0240] Aspect 56 is a computer readable medium storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 47 through 53.

[0241] Aspect 57 is an apparatus for wireless communication, comprising: a memory; and at least one processor coupled with the memory, the memory and the at least one processor being configured to: receive a paging message from a first UE on a sidelink, the paging message including paging information indicating a paging type for a page from a base station; and receive information from the base station based on the paging type indicated in the paging message from the first UE.

[0242] Aspect 58 is the apparatus of aspect 57, where the paging type indicates at least one of: a first paging type that triggers RRC setup on a Uu interface, a second paging type that triggers RRC setup on a sidelink interface, a third paging type for system information modification, a fourth paging type for ETWS notification, a fifth paging type for CMAS notification, or a sixth paging type for emergency messages or emergency notifications.

[0243] Aspect 59 is the apparatus of any of aspects 57 and 58, where the at least one processor and the memory are further configured to: receive an additional message in the paging message from the first UE, and where the additional message includes at least one of: random access resources for the first UE to perform RRC setup, or sidelink resources for the first UE to perform unicast connection setup.

[0244] Aspect 60 is a method of wireless communication for implementing any of aspects 57 through 59.

[0245] Aspect 61 is an apparatus for wireless communication, comprising means for implementing any of aspects 57 through 59.

[0246] Aspect 62 is a computer readable medium storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 57 through 59.

[0247] It should be understood that the specific order or hierarchy of various blocks disclosed in the disclosed processes / flowcharts is an illustration of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of various blocks can be re-arranged. Further, some blocks can be combined or omitted. The accompanying method claims present elements of the various blocks in a sample order, and are not meant to be limited to the specific order or hierarchy presented.

[0248] The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other aspects. Thus, the claims are not to be limited to the aspects precisely as shown herein, but should be given the full scope underlying the language of the claims, to encompass all appropriate technological equivalents of the language disclosed herein. It is intended to cover and embrace all alternatives, modifications and equivalents included within the scope of the claims. Accordingly, the phraseology or terminology employed herein, such as, for example, "comprising," "including," "carrying," "containing" or the like, is for the purpose of providing a disclosure only, and does not itself serve as a limitation of the scope of "essence" or "claim." Such phraseology and terminology, however, are understood by those of ordinary skill to be governed by the practices of claim interpretation set forth above. The phrase "some instances" is used to refer to one or more instances. The phrase "at least one of A, B, and C" is used to refer to a combination including at least one of A, B, and C, and can include combinations that contain only A, or only B, or only C, or a combination of these, where any such combination can contain one or more members of A, B, or C. The various aspects described throughout this disclosure can be used alone or in combination with one another. The various aspects described throughout this disclosure can be used in combination with each other, even though not all combinations are explicitly described.

Claims

1. An apparatus for wireless communication at a first user equipment (UE), comprising: at least one memory; and at least one processor coupled to the at least one memory, the at least one processor configured to cause the first UE to: receive a paging relay request message including one or more paging records for at least a second UE and paging information, each paging information including a UE identity of the second UE and a paging type; and transmit, to the second UE, a paging message on a sidelink, wherein the paging message includes the one or more paging records based on the UE identity of the second UE not being detected in the one or more paging records.

2. The apparatus of claim 1, wherein the paging relay request message includes the paging information for a plurality of UEs.

3. The apparatus of claim 1, wherein the at least one processor is further configured to cause the first UE to: indicate the paging type in the paging message transmitted by the first UE to the second UE on the sidelink.

4. The apparatus of claim 1, wherein the paging type indicates at least one of: a first paging type that triggers a radio resource control (RRC) setup on a Uu interface, a second paging type that triggers the RRC setup on a sidelink interface, a third paging type for a system information modification, a fourth paging type for an earthquake and tsunami warning system (ETWS) notification, a fifth paging type for a commercial mobile alert system (CMAS) notification, or a sixth paging type for an emergency message or an emergency notification.

5. The apparatus of claim 1, wherein the at least one processor is further configured to cause the first UE to: transmit, to the second UE, a dedicated paging message based on at least one paging record of the one or more paging records in response to the first UE detecting that the UE identity of the second UE is included in the one or more paging records.

6. The apparatus of claim 1, wherein the at least one processor is further configured to cause the first UE to: receive, in the paging relay request message, the paging information including a message associated with the paging information for the second UE.

7. The apparatus of claim 6, wherein the message associated with the paging information includes at least one of: a random access resource for the second UE to perform a radio resource control (RRC) setup, or a sidelink resource for the second UE to perform a unicast connection setup.

8. The apparatus of claim 1, wherein the at least one processor is further configured to cause the first UE to: receive the paging relay request message on a physical downlink shared channel (PDSCH).

9. The apparatus of claim 1, wherein the at least one processor is further configured to cause the first UE to: transmit, to the second UE, an additional message in the paging message.

10. The apparatus of claim 9, wherein the additional message includes at least one of: random access resources for the second UE to perform radio resource control (RRC) setup, or sidelink resources for the second UE to perform unicast connection setup.

11. The apparatus of claim 1, wherein to receive the paging relay request message, the at least one processor is configured to: receive the paging relay request message from a base station.

12. The apparatus of claim 1, wherein the at least one processor is individually or collectively configured to receive the paging relay request message and transmit the paging message.

13. A method of wireless communication at a first user equipment (UE), comprising: receiving a paging relay request message including one or more paging records for at least a second UE and paging information, each paging information including a UE identity of the second UE and a paging type; and transmitting a paging message to the second UE on a sidelink, wherein the paging message includes one or more paging records based on the UE identity of the second UE not being detected in the one or more paging records.

14. The method of claim 13, wherein the paging relay request message includes the paging information for a plurality of UEs.

15. The method of claim 13, further comprising: indicating the paging type in the paging message transmitted by the first UE to the second UE on the sidelink.

16. The method of claim 13, wherein the paging type indicates at least one of: a first paging type that triggers radio resource control (RRC) setup on a Uu interface, a second paging type that triggers the RRC setup on a sidelink interface, a third paging type for system information modification, a fourth paging type for earthquake and tsunami warning system (ETWS) notification, a fifth paging type for commercial mobile alert system (CMAS) notification, or a sixth paging type for emergency messages or emergency notifications.

17. The method of claim 13, further comprising: transmitting a dedicated paging message to the second UE based on at least one paging record of the one or more paging records in response to the first UE detecting that the UE identity of the second UE is included in the one or more paging records.

18. The method of claim 13, further comprising: receiving the paging information in the paging relay request message including a message associated with the paging information for the second UE.

19. The method of claim 18, wherein the message associated with the paging information includes at least one of: random access resources for the second UE to perform radio resource control (RRC) setup, or sidelink resources for the second UE to perform unicast connection setup.

20. The method of claim 13, further comprising: receiving the paging relay request message on a physical downlink shared channel (PDSCH).

21. The method of claim 13, further comprising: transmitting an additional message to the second UE in the paging message.

22. The method of claim 21, wherein the additional message comprises at least one of: a random access resource for the second UE to perform a radio resource control (RRC) setup, or a sidelink resource for the second UE to perform a unicast connection setup.

23. The method of claim 13, wherein receiving the paging relay request message comprises: receiving the paging relay request message from a base station.

24. An apparatus for wireless communication at a base station, comprising: at least one memory; and at least one processor coupled to the at least one memory, the at least one processor configured to cause the base station to: generate a paging relay request message comprising one or more paging records for at least a second user equipment (UE) and paging information, the paging information indicating a UE identity of the second UE and a paging type; and transmit, to a first UE, the paging relay request message indicating a request for the first UE to relay the paging information to the second UE over a sidelink and to relay the one or more paging records to the second UE based on the UE identity of the second UE not being detected in the one or more paging records.

25. The apparatus of claim 24, wherein the paging relay request message comprises the paging information for a plurality of UEs.

26. The apparatus of claim 24, wherein the at least one processor is further configured to cause the base station to: indicate the paging type in the paging information included in the paging relay request message.

27. The apparatus of claim 24, wherein the paging type indicates at least one of: a first paging type that triggers a radio resource control (RRC) setup on a Uu interface, a second paging type that triggers the RRC setup on a sidelink interface, a third paging type for a system information modification, a fourth paging type for an earthquake and tsunami warning system (ETWS) notification, a fifth paging type for a commercial mobile alert system (CMAS) notification, or a sixth paging type for an emergency message or an emergency notification.

28. The apparatus of claim 24, wherein the at least one processor is further configured to cause the base station to: transmit, in the paging relay request message, a message associated with the paging information for the first UE.

29. The apparatus of claim 28, wherein the message associated with the paging information comprises at least one of: a random access resource for the second UE to perform a radio resource control (RRC) setup, or a sidelink resource for the second UE to perform a unicast connection setup.

30. The apparatus of claim 24, wherein the at least one processor is further configured to cause the base station to: transmit, to the first UE, the paging relay request message on a physical downlink shared channel (PDSCH).

31. The apparatus of claim 24, wherein the at least one processor is individually or collectively configured to generate and transmit the paging relay request message.

32. An apparatus for wireless communication at a second user equipment (UE), comprising: at least one memory; and at least one processor coupled to the at least one memory and configured to cause the second UE to: receive, from a first UE, a paging message on a sidelink, the paging message including paging information indicating a paging type of a page from a base station, wherein the paging message further includes one or more paging records based on a UE identity of the second UE not being detected in the one or more paging records; and receive information from the base station based on the paging type indicated in the paging message from the first UE.

33. The apparatus of claim 32, wherein the paging type indicates at least one of: a first paging type that triggers a radio resource control (RRC) setup on a Uu interface, a second paging type that triggers the RRC setup on a sidelink interface, a third paging type for system information modification, a fourth paging type for an earthquake and tsunami warning system (ETWS) notification, a fifth paging type for a commercial mobile alert system (CMAS) notification, or a sixth paging type for an emergency message or emergency notification.

34. The apparatus of claim 32, wherein the at least one processor is further configured to cause the second UE to: receive an additional message in the paging message from the first UE, and wherein the additional message includes at least one of: random access resources for the first UE to perform a radio resource control (RRC) setup, or sidelink resources for the first UE to perform a unicast connection setup.

35. The apparatus of claim 32, wherein the at least one processor is individually or collectively configured to receive the paging message and receive the information.

36. A non-transitory computer-readable storage medium storing computer- executable code at a first user equipment (UE) for execution by a processor, the code, when executed by the processor, causing the processor to: receive a paging relay request message including one or more paging records for at least a second UE and paging information, each paging information including a UE identity of the second UE and a paging type; and transmit, to the second UE on a sidelink, a paging message, wherein the paging message includes the one or more paging records based on the UE identity of the second UE not being detected in the one or more paging records.

37. The non-transitory computer-readable storage medium of claim 36, wherein the code, when executed by the processor, further causes the processor to: indicate the paging type in the paging message transmitted by the first UE to the second UE on the sidelink.

38. The non-transitory computer-readable storage medium of claim 36, wherein the code, when executed by the processor, further causes the processor to: transmitting a dedicated paging message to the second UE based on at least one of the one or more paging records in response to the first UE detecting that the UE identity of the second UE is included in the one or more paging records.

39. The non-transitory computer-readable storage medium of claim 36, wherein the code, when executed by the processor, further causes the processor to: receive, in the paging relay request message, the paging information including a message associated with the paging information for the second UE.

40. The non-transitory computer-readable storage medium of claim 36, wherein to receive the paging relay request message, the code, when executed by the processor, further causes the processor to: receive the paging relay request message from a base station.

41. A method of wireless communication at a base station, comprising: generating a paging relay request message including one or more paging records for at least a second user equipment (UE) and paging information, the paging information indicating a UE identity of the second UE and a paging type; and transmitting the paging relay request message to a first UE, the paging relay request message indicating a request for the first UE to relay the paging information to the second UE over a sidelink and to relay the one or more paging records to the second UE based on the UE identity of the second UE not being detected in the one or more paging records.

42. The method of claim 41, further comprising: indicating the paging type in the paging information included in the paging relay request message.

43. The method of claim 41, further comprising: transmitting, in the paging relay request message, a message associated with the paging information for the first UE.

44. A non-transitory computer-readable storage medium storing computer- executable code at a base station, the code, when executed by a processor, causes the processor to: generate a paging relay request message including one or more paging records for at least a second user equipment (UE) and paging information, the paging information indicating a UE identity of the second UE and a paging type; and transmit the paging relay request message to a first UE, the paging relay request message indicating a request for the first UE to relay the paging information to the second UE over a sidelink and to relay the one or more paging records to the second UE based on the UE identity of the second UE not being detected in the one or more paging records.

45. The non-transitory computer-readable storage medium of claim 44, wherein the code, when executed by the processor, further causes the processor to: indicate the paging type in the paging information included in the paging relay request message.

46. The non-transitory computer-readable storage medium of claim 44, wherein the code, when executed by the processor, further causes the processor to: transmit, in the paging relay request message, a message associated with the paging information for the first UE.

47. A method of wireless communication at a second user equipment (UE), comprising: receiving a paging message from a first UE over a sidelink, the paging message including paging information indicating a paging type of a page from a base station, wherein the paging message further includes one or more paging records based on the paging message not being detected in the one or more paging records based on a UE identity of the second UE; and receiving information from the base station based on the paging type indicated in the paging message from the first UE.

48. The method of claim 47, further comprising: receiving an additional message in the paging message from the first UE.

49. A non-transitory computer-readable storage medium storing computer- executable code at a second user equipment (UE) that, when executed by a processor, causes the processor to: receive a paging message from a first UE over a sidelink, the paging message including paging information indicating a paging type of a page from a base station, wherein the paging message further includes one or more paging records based on the paging message not being detected in the one or more paging records based on a UE identity of the second UE; and receive information from the base station based on the paging type indicated in the paging message from the first UE.

50. The non-transitory computer-readable storage medium of claim 49, wherein the code, when executed by the processor, further causes the processor to: receive an additional message in the paging message from the first UE.

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