Identifying sidelink resources through sidelink paging

Abstract

Certain aspects of the present disclosure provide a method for wireless communication between a first UE and a second UE. The method includes receiving, at the first UE, a paging indication message from the second UE on a sidelink channel, the paging indication message associating the first UE with one or more resources in a common resource pool, the common resource pool including resources for communication on the sidelink channel. The method also includes monitoring the one or more resources for messages from the second UE based on the received paging indication message.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Application No. 17 / 232,617, filed on April 16, 2021, which claims the benefit of and priority to U.S. Provisional Application No. 63 / 012,731, filed on April 20, 2020, which is assigned to the present assignee and is hereby expressly incorporated by reference in its entirety as if fully set forth below and for all applicable purposes. Technical Field

[0003] Aspects of the present disclosure relate to wireless communications and, more particularly, to techniques for identifying resources for sidelink communications via sidelink paging. Background Art

[0004] Wireless communication systems are widely deployed to provide various telecommunication services, such as telephony, video, data, messaging, and broadcast. These wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of these multiple-access systems include the Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) system, the LTE-Advanced (LTE-A) system, the Code Division Multiple Access (CDMA) system, the Time Division Multiple Access (TDMA) system, the Frequency Division Multiple Access (FDMA) system, the Orthogonal Frequency Division Multiple Access (OFDMA) system, the Single Carrier Frequency Division Multiple Access (SC-FDMA) system, and the Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system, to name a few.

[0005] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a city, country, regional, and even global level. New Radio (e.g., 5G NR) is an example of an emerging telecommunication standard. NR is a set of enhancements to the LTE mobile standard released by 3GPP. NR is designed to better support mobile broadband internet access by improving spectral efficiency, reducing costs, improving services, utilizing new spectrum, and better integrating with other open standards using OFDMA and cyclic prefixes (CP) on the downlink (DL) and uplink (UL). To this end, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0006] However, as the demand for mobile broadband access continues to increase, there is a need for further improvements to NR and LTE technologies. Preferably, these improvements should be applicable to other multi-access technologies and telecommunication standards that employ these technologies. Summary of the Invention

[0007] The systems, methods, and devices of the present disclosure each have several aspects, no single one of which is solely responsible for its desirable attributes. Without limiting the scope of the disclosure as expressed by the appended claims, some features will now be briefly discussed. After considering this discussion, and particularly after reading the section entitled "Detailed Description," one will understand how the features of the present disclosure provide advantages, including improved identification of sidelink resources for sidelink communications.

[0008] Certain aspects of the subject matter described in this disclosure may be implemented in a method for wireless communication between a first user equipment (UE) and a second UE. The method generally includes receiving, at the first UE, a paging indication message from the second UE on a sidelink channel, the paging indication message associating the first UE with one or more resources of a common resource pool, the common resource pool including a plurality of resources for communication on the sidelink channel. The method also includes monitoring the one or more resources for messages from the second UE based on receiving the paging indication message.

[0009] Certain aspects of the subject matter described in this disclosure may be implemented in a method for wireless communication between a first user equipment (UE) and a second UE. The method generally includes: receiving, at the first UE, a paging indication message from the second UE on a sidelink channel, the paging indication message associating the first UE with one or more resources of a common resource pool, the common resource pool including a plurality of resources for communicating on the sidelink channel. The method also includes: at the first UE, based on receiving the paging indication message, monitoring the one or more resources for messages from the second UE.

[0010] Certain aspects of the subject matter described in the present disclosure may be implemented in a method for wireless communication between a first UE and a second UE. The method generally includes: receiving a message at the first UE from the second UE. The method generally includes: identifying, at the first UE, one or more resources of a common resource pool based on receiving the message, the common resource pool including a plurality of resources for communicating on a sidelink channel. The method generally includes: sending, at the first UE, a paging indication message to the second UE on the sidelink channel, the paging indication message indicating the one or more resources. The method generally includes: sending, at the first UE, a second message to the second UE in the one or more resources.

[0011] Certain aspects of the subject matter described in this disclosure can be implemented in a first UE comprising a memory and a processor. The memory and processor are configured to receive a paging indication message from a second UE on a sidelink channel, the paging indication message associating the first UE with one or more resources of a common resource pool, the common resource pool comprising a plurality of resources for communicating on the sidelink channel. The memory and processor are further configured to monitor the one or more resources for messages from the second UE based on receiving the paging indication message.

[0012] Certain aspects of the subject matter described in this disclosure can be implemented in a first UE comprising a memory and a processor. The memory and the processor are configured to receive a message from a second UE. The memory and the processor are further configured to, based on the received message, identify one or more resources of a common resource pool, the common resource pool comprising a plurality of resources for communicating on a sidelink channel. The memory and the processor are further configured to send a paging indication message to the second UE on the sidelink channel, the paging indication message indicating the one or more resources. The memory and the processor are further configured to send a second message to the second UE in the one or more resources.

[0013] Certain aspects of the subject matter described in this disclosure can be implemented in a first UE. The first UE generally includes: means for receiving a paging indication message from a second UE on a sidelink channel, the paging indication message associating the first UE with one or more resources of a common resource pool, the common resource pool including a plurality of resources for communicating on the sidelink channel. The first UE also includes: means for monitoring the one or more resources for messages from the second UE based on receiving the paging indication message.

[0014] Certain aspects of the subject matter described in this disclosure can be implemented in a first UE. The first UE generally includes: means for receiving a message from a second UE. The first UE generally includes: means for identifying one or more resources of a common resource pool based on the received message, the common resource pool including multiple resources for communicating on a sidelink channel. The first UE generally includes: means for sending a paging indication message to the second UE on the sidelink channel, the paging indication message indicating the one or more resources. The first UE generally includes: means for sending a second message to the second UE in the one or more resources.

[0015] Certain aspects of the subject matter described in this disclosure may be implemented in a non-transitory computer-readable medium comprising instructions that, when executed by a first UE, cause the first UE to perform a method for wireless communication between the first UE and a second UE. The method generally includes: receiving, at the first UE, a paging indication message from the second UE on a sidelink channel, the paging indication message associating the first UE with one or more resources of a common resource pool, the common resource pool comprising: a plurality of resources for communication on the sidelink channel. The method also includes: monitoring, at the first UE, the one or more resources for messages from the second UE based on receiving the paging indication message.

[0016] Certain aspects of the subject matter described in the present disclosure may be implemented in a non-transitory computer-readable medium comprising instructions that, when executed by a first UE, cause the first UE to perform a method for wireless communication between the first UE and a second UE. The method generally includes: at the first UE, receiving a message from the second UE. The method generally includes: based on the received message, identifying one or more resources of a common resource pool, the common resource pool including a plurality of resources for communicating on a sidelink channel. The method generally includes: sending a paging indication message to the second UE on the sidelink channel, the paging indication message indicating the one or more resources. The method generally includes: sending a second message to the second UE in the one or more resources.

[0017] Aspects of the present disclosure provide units, devices, processors, and computer-readable media for performing the methods described herein.

[0018] Aspects of the present disclosure provide units, devices, processors, and computer-readable media for performing techniques and methods that can be performed by, for example, a base station, complementary to the operations of a UE described herein.

[0019] To accomplish the foregoing and related ends, one or more aspects include the features hereinafter fully described and particularly pointed out in the claims. The following description and accompanying drawings set forth in detail certain illustrative features of one or more aspects. However, these features are indicative of but some of the various ways in which the principles of the various aspects may be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] So that the manner in which the foregoing features of the present disclosure may be understood in detail, a more particular description of the foregoing briefly summarized aspects may be had by reference to various aspects, some of which are illustrated in the accompanying drawings. It should be noted, however, that the drawings illustrate only certain typical aspects of the disclosure and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects.

[0021] Figure 1is a block diagram conceptually illustrating an example telecommunications system in accordance with certain aspects of the present disclosure.

[0022] Figure 2 is a block diagram conceptually illustrating designs of an exemplary base station (BS) and user equipment (UE) in accordance with certain aspects of the present disclosure.

[0023] Figure 3 is an example frame format for certain wireless communication systems (e.g., New Radio (NR)) in accordance with certain aspects of the present disclosure.

[0024] Figures 4A-4C A diagram of an example vehicle-to-everything (V2X) system is shown, in accordance with certain aspects of the present disclosure.

[0025] Figure 5 is a time-frequency diagram illustrating different resource pools in a pedestrian-to-vehicle / vehicle-to-pedestrian (P2V / V2P) communication channel, in accordance with certain aspects of the present disclosure.

[0026] Figure 6 is a flow diagram illustrating example operations for monitoring a specific set of one or more resources using received paging indication messages, in accordance with certain aspects of the present disclosure.

[0027] Figure 7 is a flow diagram illustrating example operations for using a paging indication message to indicate a specific set of one or more resources to monitor, in accordance with certain aspects of the present disclosure.

[0028] Figure 8 is a time-frequency diagram illustrating a sidelink paging indication message carrying data explicitly mapped to specific time-frequency resources in a sidelink common pool, in accordance with certain aspects of the present disclosure.

[0029] Figure 9 is a time-frequency diagram illustrating a sidelink paging indication message implicitly mapped to specific time-frequency resources in a sidelink common pool in accordance with certain aspects of the present disclosure.

[0030] Figure 10 A communications device according to aspects of the present disclosure is shown that may include various components configured to perform operations for the techniques disclosed herein.

[0031] Figure 11 A communications device according to aspects of the present disclosure is shown that may include various components configured to perform operations for the techniques disclosed herein.

[0032] To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements disclosed in one aspect may be beneficially utilized on other aspects without specific recitation. DETAILED DESCRIPTION

[0033] User equipment (UE) can exchange sidelink information (e.g., user data and control signaling) directly with other UEs without the assistance (e.g., relay) of a base station. This type of sidelink communication is often referred to as point-to-point (also known as device-to-device or D2D) communication. An example of point-to-point communication includes vehicle-to-everything (V2X) communication, where a vehicle can communicate with another vehicle (referred to as vehicle-to-vehicle (V2V) communication), a pedestrian / human UE (referred to as vehicle-to-pedestrian (V2P) communication), a base station, a traffic control system, etc.

[0034] Improved V2P sidelink communications can help protect pedestrian safety. For example, when a pedestrian is in a potential collision situation with a vehicle (e.g., when the pedestrian enters a certain threshold distance of the vehicle), a first UE, such as a vehicle UE (also referred to herein as a VUE), can send one or more sidelink messages (e.g., a warning message) to a second UE, such as a pedestrian UE (also referred to herein as a PUE). It should be noted that although certain aspects are described with respect to a VUE sending one or more messages to a PUE, these aspects can similarly apply to other scenarios, such as any UE (e.g., a transmitting (Tx) UE) sending a message to another UE (e.g., a receiving (Rx) UE). In addition, other types of messages can be sent, such as any message indicating an event detected by a Tx UE (e.g., one or more of the following: a potential collision between a Tx UE and an Rx UE, the right of way of the Tx UE, the speed of the Tx UE, a road hazard, the status of a drawbridge, vehicle aspects of the Tx UE (e.g., size, urgency, type of load, etc.), etc.

[0035] However, to receive these sidelink messages, in one case, the Rx UE may have to monitor the sidelink channel between the Tx UE and the Rx UE during a specific time period, which may occur periodically and be used to transmit sidelink messages between the Tx UE and the Rx UE. For example, the Rx UE may need to monitor the sidelink channel for each such time period, regardless of whether the Tx UE sends a sidelink message to the Rx UE within the given time period. That is, for each time period, the Rx UE may have to monitor all time and / or frequency resources of a common resource pool (e.g., which may be used by several different sidelink devices) of the periodically occurring sidelink channel to be able to receive sidelink messages (e.g., warnings) from the Tx UE. This may significantly increase the power consumption of the Rx UE.

[0036] Various aspects of the present disclosure provide apparatuses, methods, processing systems, and computer-readable media that enable an Rx UE to potentially reduce the time spent monitoring a sidelink channel for sidelink messages, and also potentially reduce the frequency bandwidth over which the Rx UE monitors the sidelink channel for sidelink messages. In certain aspects, based on the techniques discussed herein, the Rx UE monitors only during those time periods in which the Tx UE has a sidelink message to send to the Rx UE. In addition, for each such time period, the Rx UE may monitor only a specific portion of the sidelink channel (e.g., one or more time-frequency resources) to receive the sidelink message from the Tx UE. That is, instead of monitoring an entire common resource pool on the sidelink channel (e.g., used by different Tx UEs / Rx UEs) during a given time period, in some aspects, the Rx UE may monitor a specific set of one or more resources (e.g., time-frequency resources, such as physical resource blocks) on the sidelink channel for potential messages sent by the Tx UE to the Rx UE during a given time period.

[0037] In some aspects, the Tx UE may send a paging indication message to the Rx UE, indicating that a sidelink message for the Rx UE exists during a given time period associated with the paging indication message. The paging indication message may also specify specific time-frequency resources on the sidelink channel for the given time period for the Rx UE to transmit one or more sidelink messages.

[0038] The Rx UE may monitor for paging indication messages during a paging period dedicated to transmitting paging indication messages from the Tx UE to the Rx UE. For example, paging periods (like the period used to transmit sidelink messages) may occur periodically. For example, the corresponding paging period may occur before the corresponding period used to transmit sidelink messages. The paging period may be shorter than the period used to transmit sidelink messages. The Rx UE may monitor all frequency resources associated with the paging period for the paging indication message, for example, all frequencies of the sidelink channel.

[0039] If an Rx UE receives a paging indication message intended for the Rx UE during a paging time period, the paging indication message may indicate to the Rx UE which time-frequency resources of the common resource pool to monitor in order to receive a sidelink message during the corresponding time period. Thus, in certain aspects, for the corresponding time period, the Rx UE only monitors one or more time-frequency resources in the common resource pool for which it has received one indication in one or more paging indications from one or more Tx UEs indicating that the Rx UE should monitor such one or more time-frequency resources in the common resource pool during the corresponding time period. In such aspects, the Rx UE does not monitor other time-frequency resources in the common resource pool for which it has not received an indication in a paging indication during the corresponding time period, thereby saving power consumption used to monitor resources in the common resource pool for messages. Furthermore, as discussed herein, such paging indications and common resource pool resources may occur periodically, so that if the Tx UE later has a warning to send to the Rx UE, it can provide a paging indication for a portion of the common resource pool resources for another time period.

[0040] Thus, in certain aspects, one or more sidelink Tx UEs, such as vehicles or roadside units (RSUs), can use a paging indication message to instruct one or more sidelink Rx UEs, such as pedestrians, vehicles, radar guns, or RSUs, to monitor one or more specific resources in a common resource pool for receiving corresponding messages from the Tx UEs, e.g., within a specific time period. For example, a first VUE can use a first paging indication message to instruct a PUE to monitor a first set of resources in the common resource pool for receiving messages from the first VUE, while a second VUE can use a second paging indication message to instruct the PUE to monitor a second set of resources in the common resource pool for receiving messages from the second VUE. Thus, the PUE can simultaneously monitor the first set of resources and the second set of resources. As another example, a Tx UE (e.g., a drawbridge or a traffic light) can use a paging indication message to instruct an Rx UE (e.g., a VUE) to monitor a specific portion of the common resource pool for receiving messages from the Tx UE (e.g., regarding the status of the drawbridge or the status of the traffic light). Thus, the PUE can monitor the specific portion of the common resource pool for receiving messages.

[0041] In some aspects, the Tx UE can explicitly indicate the time and frequency of resources to the Rx UE. For example, the Tx UE can configure the values included in the paging indication message so that the target Rx UE can identify the time and frequency of any potential sidelink messages based on the values included in the paging indication message. In some other aspects, the Tx UE can implicitly indicate to the Rx UE which sidelink resources to monitor. For example, the Tx UE can use different resource sets to send the paging indication message, where each specific resource set can be mapped to a different portion of a common sidelink resource pool, where the Rx UE can receive sidelink messages from the Tx UE.

[0042] The following description provides an example of identifying resources for sidelink communication through sidelink paging and does not limit the scope, applicability, or examples set forth in the claims. The functions and arrangements of the elements discussed may be changed without departing from the scope of the present disclosure. Various examples may omit, replace, or add various processes or components as appropriate. For example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Moreover, the features described for some examples may be combined in some other examples. For example, a device may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the present disclosure is intended to cover such devices or methods implemented with other structures, functions, or structures and functions that supplement or replace the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the claims. The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any aspect described herein as "exemplary" is not necessarily to be construed as being preferred or advantageous over other aspects.

[0043] In general, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific radio access technology (RAT) and can operate on one or more frequencies. A RAT can also be referred to as a radio technology, air interface, etc. A frequency can also be referred to as a carrier, subcarrier, frequency channel, tone, subband, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs.

[0044] The techniques described herein can be used for various wireless networks and radio technologies. Although various aspects may be described herein using terms generally associated with 3G, 4G, and / or new radio (e.g., 5G NR) wireless technologies, various aspects of the present disclosure can be applied to other generation-based communication systems.

[0045] NR access can support various wireless communication services, such as enhanced mobile broadband (eMBB) for broadband (e.g., 80 MHz or higher), millimeter wave (mmW) for high carrier frequencies (e.g., 24 GHz to 53 GHz or higher), massive machine type communication (MTC) (mMTC) for non-backward compatible MTC technologies, and / or mission-critical ultra-reliable low latency communication (URLLC). These services may include latency and reliability requirements. These services may also have different transmission time intervals (TTIs) to meet corresponding quality of service (QoS) requirements. In addition, these services can coexist in the same subframe. NR supports beamforming and can dynamically configure beam directions. MIMO transmission with precoding can also be supported. MIMO configuration in DL can support up to 8 transmit antennas, with multi-layer DL transmission of up to 8 streams and up to 2 streams per UE. Multi-layer transmission with up to 2 streams per UE can be supported. Up to 8 serving cells can support aggregation of multiple cells.

[0046] Figure 1 1 is a block diagram conceptually illustrating an exemplary wireless communication network 100 according to certain aspects of the present disclosure. For example, the wireless communication network 100 may be an NR system (e.g., a 5G NR network). Figure 1 As shown in , the wireless communication network 100 may communicate with a core network 132. The core network 132 may communicate with one or more base stations (BSs) 110 and / or user equipments (UEs) 120 in the wireless communication network 100 via one or more interfaces.

[0047] like Figure 1 As shown in , the wireless communication network 100 may include several BSs 110a-z (each BS is also referred to herein individually as BS 110 or collectively as BS 110) and other network entities. BS 110 may provide communication coverage for a specific geographic area (sometimes referred to as a "cell"), which may be stationary or may move according to the location of the mobile BS 110. In some examples, BSs 110 may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in the wireless communication network 100 using any suitable transport network via various types of backhaul interfaces (e.g., direct physical connections, wireless connections, virtual networks, etc.). Figure 1 In the example shown, Figure 1As shown, BSs 110a, 110b, and 110c may be macro BSs corresponding to macrocells 102a, 102b, and 102c, respectively. BS 110x may be a pico BS corresponding to picocell 102x. BSs 110y and 110z may be femto BSs corresponding to femtocells 102y and 102z, respectively. A BS may support one or more cells.

[0048] BS 110 in wireless communication network 100 communicates with UEs 120a-y (each UE is also referred to herein individually as UE 120 or collectively as UE 120). UEs 120 (e.g., 120x, 120y, etc.) may be dispersed throughout wireless communication network 100, and each UE 120 may be stationary or mobile. Wireless communication network 100 may also include relay stations (e.g., relay station 110r), also referred to as relay stations, etc., which receive transmissions of data and / or other information from upstream stations (e.g., BS 110a or UE 120r) and send transmissions of data and / or other information to downstream stations (e.g., UE 120 or BS 110), or relay transmissions between UEs 120 to facilitate communication between devices.

[0049] like Figure 1 As shown, UEs 120a and 120b may include, in addition to other modules / managers, sidelink (SL) paging managers 122a and 122b, respectively. UE 120a may communicate directly with UE 120b via a sidelink channel (e.g., a physical sidelink control channel (PSCCH) and / or a physical sidelink shared channel (PSSCH), etc.). For example, UEs 120a and 120b may exchange user data using the PSSCH between UEs, or may exchange control data using the PSCCH. As will be discussed in more detail below, UE 120a may function as a Tx UE (e.g., a VUE carried in a vehicle), while UE 120b may function as a Rx UE (e.g., a PUE carried by a person / pedestrian).

[0050] For example, when the PUE 120b is within a certain distance of the VUE 120a, the VUE 120a may send a warning message to the PUE 120b (e.g., via the PSSCH) (e.g., if the VUE 120a has previously received the location and identification (ID) information of the PUE 120b). To this end, the SL paging manager 122a may send a paging indication message (or signal) to the PUE 120b (e.g., to the SL paging manager 122b) to indicate that the SL message (e.g., the warning message) can be found in the common resource pool of the sidelink channel. The paging indication message may be carried via dedicated resources of the sidelink channel and may also include data or be sent on resources of a specific portion (e.g., a specific time and frequency) of the designated sidelink channel for the PUE 120b to monitor for receiving the SL message. The SL paging manager 122b may begin monitoring the designated resources for potential SL messages after receiving the paging indication message from the SL paging manager 122a.

[0051] Figure 2 It is shown (for example, Figure 1 1 and 2. Example components of a BS 110a and a UE 120a in a wireless communication network 100 of FIG. 1 , which may be used to implement aspects of the present disclosure.

[0052] At BS 110a, transmit processor 220 may receive data from data source 212 and control information from controller / processor 240. Control information may be used for the physical broadcast channel (PBCH), physical control format indicator channel (PCFICH), physical hybrid ARQ indicator channel (PHICH), physical downlink control channel (PDCCH), group common PDCCH (GC PDCCH), etc. Data may be used for the physical downlink shared channel (PDSCH), etc. A medium access control (MAC)-control element (MAC-CE) is a MAC layer communication structure that may be used for the exchange of control commands between wireless nodes. A MAC-CE may be carried in a shared channel, such as the physical downlink shared channel (PDSCH), the physical uplink shared channel (PUSCH), or the physical sidelink shared channel (PSSCH).

[0053] The processor 220 can process (e.g., encode and symbol map) data and control information to obtain data symbols and control symbols, respectively. The transmit processor 220 can also generate reference symbols, such as for the primary synchronization signal (PSS), secondary synchronization signal (SSS), PBCH demodulation reference signal (DMRS), and channel state information reference signal (CSI-RS). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on data symbols, control symbols, and / or reference symbols (if applicable) and can provide output symbol streams to modulators (MOD) 232a-232t. Each modulator 232 can process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator can further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. The downlink signals from modulators 232a-232t can be transmitted via antennas 234a-234t, respectively.

[0054] At UE 120a, antennas 252a-252r can receive downlink signals from BS 110a and can provide received signals to demodulators (DEMODs) in transceivers 254a through 254r, respectively. Each demodulator 254 can condition (e.g., filter, amplify, downconvert, and digitize) its respective received signal to obtain input samples. Each demodulator can further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 can obtain received symbols from all demodulators 254a through 254r, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. A receive processor 258 can process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 120a to a data sink 260, and provide decoded control information to a controller / processor 280.

[0055] On the uplink, at UE 120a, a transmit processor 264 may receive and process data (e.g., for a physical uplink shared channel (PUSCH)) from a data source 262 and control information (e.g., for a physical uplink control channel (PUCCH)) from a controller / processor 280. The transmit processor 264 may also generate reference symbols for reference signals (e.g., for a sounding reference signal (SRS)). The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 (if applicable), further processed by a modulator in transceivers 254a-254r (e.g., for SC-FDM, etc.), and transmitted to BS 110a. At BS 110a, the uplink signal from UE 120a may be received by antenna 234, processed by modulator 232, detected by MIMO detector 236 (if applicable), and further processed by receive processor 238 to obtain decoded data and control information sent by UE 120a. The receive processor 238 may provide decoded data to a data sink 239 and decoded control information to a controller / processor 240 .

[0056] Memories 242 and 282 may store data and program codes for BS 110a and UE 120a, respectively.A scheduler 244 may schedule UEs for data transmission on the downlink and / or uplink.

[0057] The antennas 252, processors 266, 258, 264 and / or controller / processor 280 of the UE 120a, and / or the antennas 234, processors 220, 230, 238 and / or controller / processor 240 of the BS 110a may be operable to perform the various techniques and methods described herein. Figure 2 As shown in FIG, the controller / processor 280 of the UE 120a may include a SL paging manager 281 configured to send / receive paging indication messages according to aspects described herein. The paging indication messages may indicate (e.g., to a PUE) specific resources, such as one or more physical resource blocks (PRBs) in a sidelink common resource pool for monitoring and receiving SL messages. Although shown at the controller / processor level, other components of the UE 120a and the BS 110a may be used to perform the operations described herein.

[0058] NR can utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on both the uplink and downlink. NR can support half-duplex operation using time division duplexing (TDD). OFDM and single-carrier frequency division multiplexing (SC-FDM) divide the system bandwidth into multiple orthogonal subcarriers, which are also commonly referred to as tones, bins, etc. Each subcarrier can be modulated with data. Modulation symbols can be sent in the frequency domain using OFDM and in the time domain using SC-FDM. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers can depend on the system bandwidth. The minimum resource allocation, called a resource block (RB), can be 12 consecutive subcarriers. The system bandwidth can also be divided into subbands. For example, a subband can cover multiple RBs. NR can support a basic subcarrier spacing (SCS) of 15 kHz, and other SCSs (e.g., 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc.) can be defined for the basic SCS.

[0059] Figure 3 3 is a diagram showing an example of a frame format 300 for NR. The transmission timeline for each of the downlink and uplink can be divided into units of radio frames. Each radio frame can have a predetermined duration (e.g., 10 ms) and can be divided into 10 subframes, each 1 ms and having indices 0 to 9. Each subframe can include a variable number of slots (e.g., 1, 2, 4, 8, 16, ... slots), depending on the SCS. Each slot can include a variable number of symbol periods (e.g., 7, 12, or 14 symbols), depending on the SCS. The symbol periods in each slot can be assigned an index. A mini-slot, which can be referred to as a subslot structure, refers to a transmission time interval with a duration less than one slot (e.g., 2, 3, or 4 symbols). Each symbol in a slot can indicate a link direction (e.g., DL, UL, or flexible) for data transmission, and the link direction for each subframe can be dynamically switched. The link direction can be based on the slot format. Each slot can include DL / UL data and DL / UL control information.

[0060] In NR, synchronization signal blocks (SSBs) are transmitted. In certain aspects, SSBs may be transmitted in bursts, where each SSB in the burst corresponds to a different beam direction for UE-side beam management (e.g., including beam selection and / or beam refinement). SSBs include PSS, SSS, and two symbols of PBCH. They may be transmitted at fixed slot locations (e.g., Figure 3The PBCH carries basic system information, such as downlink system bandwidth, timing information within radio frames, SS burst set periodicity, and system frame number.

[0061] SSBs can be organized into SS bursts to support beam scanning. Other system information such as remaining minimum system information (RMSI), system information blocks (SIBs), and other system information (OSI) can be sent on the physical downlink shared channel (PDSCH) in certain subframes. For millimeter waves, SSBs can be sent up to 64 times, for example, with up to 64 different beam directions. Multiple transmissions of SSBs are called SS burst sets. SSBs in one SS burst set can be sent in the same frequency region, while SSBs in different SS burst sets can be sent at different frequency regions.

[0062] In some examples, the communication between UE 120 and BS 110 is referred to as an access link. The access link can be provided via a Uu interface. The communication between devices can be referred to as a sidelink.

[0063] In some examples, two or more slave entities (e.g., UE 120) can communicate with each other using sidelink signals. Practical applications of such sidelink communications may include public safety, proximity services, UE-to-network relay, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical grids, and / or various other suitable applications. In general, a sidelink signal may refer to a message sent from one slave entity (e.g., Figure 1 As shown in FIG, , sidelink signals are transmitted from one UE 120a) to another dependent entity (e.g., UE 120b) without relaying the communication through a scheduling entity (e.g., BS 110), even though the scheduling entity may be used for scheduling and / or control purposes. In some examples, licensed spectrum can be used (unlike wireless local area networks, which typically use unlicensed spectrum) to transmit sidelink signals. One example interface for sidelink communication is PC5, such as used in V2V, LTE, and / or NR.

[0064] Various sidelink channels may be used for sidelink communications, including a physical sidelink discovery channel (PSDCH), a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), and a physical sidelink feedback channel (PSFCH). The PSDCH may carry discovery expressions that enable nearby devices to discover each other. The PSCCH may carry control signaling, such as sidelink resource configurations, paging indication messages, and other parameters for data transmission, and the PSSCH may carry data transmissions (e.g., sidelink messages). The PSFCH may carry sidelink feedback, such as distance-based and / or non-distance-based HARQ feedback related to data transmissions between two or more UEs communicating directly with each other.

[0065] like Figure 4A 、 Figure 4B and Figure 4C A diagram of an exemplary V2X system according to some aspects of the present disclosure is shown. For example, Figures 4A-4C The vehicle shown in can perform data transmission via a sidelink channel, as described herein.

[0066] Figure 4A and Figure 4B The V2X system shown in Figure 1 provides two complementary transmission modes. The first transmission mode, in which Figure 4A As shown by way of example in FIG, direct communication (also referred to as sidelink communication) between participants that are close to each other in a local area may be involved. UEs (e.g., vehicles 402 and 404, or RSUs) 2 The sidelink transmission of the signal (e.g., traffic light) 410) can be implemented on the PC5 interface (e.g., the wireless communication interface between the first UE and the second UE). Figure 4B As shown by way of example in FIG, network communication through a network may be involved, which may be achieved through a Uu interface (eg, a wireless communication interface between a radio access network (RAN) and a UE).

[0067] refer to Figure 4A , a V2X system 400 (e.g., vehicle-to-vehicle (V2V) communications) is shown with two vehicles 402, 404. A first transmission mode allows direct communication between different participants in a given geographic location. As shown, the vehicles can have wireless communication links 406 with individual UEs (e.g., as part of V2P communications) via a PC5 interface. Communications between vehicles 402 and 404 can also occur via a PC5 interface 408. In a similar manner, communications can occur from vehicle 402 to other highway components (e.g., highway component 410), such as traffic signals or signs (V2I) via a PC5 interface 412. Figure 4AEach communication link shown in , enables bidirectional communication between elements, so each element can be both a transmitter and a receiver of information.

[0068] The V2X system 400 can be a self-managed system that operates without the assistance of network entities. Because there is no network service interruption during handover operations between moving vehicles, this self-managed system can improve spectrum efficiency, reduce costs, and increase reliability. The V2X system can be configured to operate in licensed and / or unlicensed spectrum, allowing any system-equipped vehicle to access common frequencies and share information. This coordinated / shared spectrum operation enables secure and reliable operation.

[0069] Figure 4B A V2X system 450 is shown for communicating between a vehicle 452 and a vehicle 454 via a network entity 456. These network communications may be performed via a network entity such as a BS (e.g., Figure 1 110a) that transmits information to vehicles 452, 454 (or relays information between vehicles 452, 454) and receives information from vehicles 452, 454. For example, network communications via vehicle-to-network (V2N) links 458 and 460 can be used for long-range communications between vehicles, such as for communicating a car accident some distance ahead along a road or highway. Wireless nodes can send other types of communications to vehicles, such as traffic flow conditions, road hazard warnings, environmental / weather reports, and service station availability. This data can be obtained from a cloud-based sharing service.

[0070] Figure 4C A V2P system 490 is shown for communicating between a VUE 492 and a PUE 494. As shown, when the VUE 492 determines that the PUE 494 is within a threshold proximity, the VUE 492 can send a paging indication message to the PUE 494 (e.g., via dedicated V2P resources, as described below). In one example, there can be preconfigured time / frequency resources in which the PUE can send P2V messages, from which the VUE can infer the presence of the PUE. The paging indication message can include data and / or be sent on resources that indicate (i) the identity of the PUE and / or (ii) one or more time-frequency resources (e.g., PRBs) in a sidelink channel that can carry sidelink messages for the PUE.

[0071] After determining that the transmitted paging indication message is intended for PUE 494 (e.g., based on the identification data), PUE 494 can monitor the indicated resources (e.g., rather than the entire common resource pool for the associated time period in which the paging was transmitted) for potential sidelink messages from VUE 492. The sidelink message can indicate to PUE 494 that it is too close to the vehicle carrying VUE 492. For example, the sidelink message transmitted by VUE 492 can indicate one or more warning notifications / alarms / events to the person carrying PUE 494 based on the VUE's detection of the event in question (e.g., a potential impact on the vehicle). It should be noted that a second VUE (not shown) can transmit another paging indication message to PUE 494. Thus, PUE 494 can additionally monitor one or more other time-frequency resources in the sidelink channel indicated by the other paging indication message.

[0072] For example, the VUE 402 may send a paging indication message to the VUE 404 to indicate to the VUE 404 to monitor a first set of resources in the common resource pool of the sidelink channel for potential messages from the VUE 402 (e.g., to stay in the correct lane due to an approaching ambulance). 2 410 (eg, a traffic light) may send another paging message to the same VUE 404 to instruct the VUE 404 to monitor the common resource pool of the sidelink channel for receiving traffic from the RSU. 2 Thus, the VUE 404 can monitor the first set of resources for any potential message sent by the VUE 402 and can monitor the second set of resources for any potential message sent by the RSU 410 (e.g., prepare to stop because the traffic light is about to turn red). 2 410 monitors the second set of resources for any potential messages sent.

[0073] Figure 55 is a time-frequency diagram illustrating different resource pools in a P2V / V2P communication channel according to certain aspects of the present disclosure. In diagram 500, multiple time-frequency resources 501 for communication are shown. The frequency bandwidth of the time-frequency resources 501 can correspond to the frequency bandwidth of the sidelink channel. Although the frequency resources are shown as continuous in frequency, it should be noted that in certain aspects, the frequency resources may not be continuous in frequency. The time-frequency resources 501 are divided into periodic time periods W 502. Each time period W 502 is divided into a P2V / V2P pool 504 and a SL common pool 510. The P2V / V2P pool 504 corresponds to time-frequency resources (e.g., one or more time slots across one or more subchannels) dedicated to P2V / V2P communication (e.g., between a VUE and a PUE). The SL common pool 510 corresponds to time-frequency resources (e.g., one or more time slots across one or more subchannels) that can be used for any communication (e.g., any sidelink communication). Therefore, the P2V / V2P pool is time-division multiplexed with the SL common pool.

[0074] Figure 5 Graph 550 in FIG shows the components of the dedicated P2V / V2P pool 504 in more detail. Although the frequency resources are shown as being contiguous in frequency, it should be noted that in some aspects, the frequency resources may not be contiguous in frequency. As shown, the P2V / V2P pool 504 is divided into dedicated P2V pool 506 resources and dedicated V2P paging pool 508 resources. In some aspects, a PUE may use the P2V pool 506 resources only for transmission (e.g., for a duration of m1). That is, the resources in the P2V pool 506 may be dedicated to PUE transmissions. In some aspects, the V2P paging pool 508 resources may be dedicated to VUEs for use (e.g., for a duration of m0, e.g., where m0 is shorter than m1) to send paging indication messages, wherein the VUE may indicate to the PUE whether there is a sidelink message for the PUE (e.g., in the SL common pool 510). The SL common pool 510 may be used by both PUEs and VUEs (e.g., for a duration of m2, e.g., where m2 is longer than m1). The PUE may monitor the SL pool 510 for potential sidelink messages sent by the VUE (e.g., as indicated in a paging indication message). In certain aspects, the resources used for VUE sidelink messages in the SL common pool 510 may be configured to include the entire bandwidth, in which case the PUE may decode all subchannels in some cases, or they may be configured to include only a specific set of time-frequency resources.

[0075] As described above, in some aspects of the present disclosure, the VUE may designate a corresponding specific set of resources for each of one or more PUEs to monitor on a sidelink channel for sidelink messages that may be sent by the VUE. For example, the VUE may designate different one or more time-frequency resources for individual PUEs, different sets of PUEs, no resources for certain PUEs, etc. In some aspects, the VUE may use a paging indication message for this purpose. The paging indication message may indicate to the one or more PUEs whether there are sidelink messages for those one or more PUEs in a common resource pool. In some aspects, the VUE may explicitly indicate to the PUE the time and frequency of the resources (e.g., as will be referenced below). Figure 8 In some other aspects, the VUE may indicate to the PUE which sidelink resources to monitor implicitly (e.g., as described below with reference to Figure 9 description).

[0076] Figure 6 is a flow diagram illustrating example operations 600 for monitoring a specific set of one or more resources using a received paging indication message in accordance with certain aspects of the present disclosure. Figure 1 100) to perform operations 600. Operations 600 may be implemented as a process in one or more processors (e.g., Figure 2 In addition, the system can be connected to the network via one or more antennas (e.g., Figure 2 The UE may utilize antenna 252 to enable transmission and reception of signals by the UE in operation 600. In certain aspects, transmission and / or reception of signals by the UE may be enabled by obtaining and / or outputting signals via a bus interface of one or more processors (e.g., controller / processor 280).

[0077] Operation 600 may begin at 602 by receiving a paging indication message at a first UE (e.g., associated with a person, such as a PUE) on a sidelink channel from a second UE (e.g., associated with a vehicle, such as a VUE), the paging indication message associating the first UE with one or more resources of a common resource pool, the common resource pool comprising a plurality of resources for communicating on the sidelink channel. In some aspects, in addition to data identifying the first UE as a recipient of the message, the paging indication message may include values mapped to one or more resources (e.g., one or more physical resource blocks (PRBs)) and associated with the data identifying the first UE. In some aspects, the paging indication message may include data identifying one or more additional UEs as recipients of the message, and corresponding one or more values, each value mapped to one or more resources (e.g., one or more PRBs) and associated with corresponding data identifying the corresponding UE.

[0078] Operations 600 may then continue by monitoring, by the first UE at 604, one or more resources for messages from the second UE based on the received paging indication message. That is, the first UE may monitor only the time-frequency resources (e.g., PRBs) identified by the paging indication message for receiving potential messages from the second UE, rather than monitoring the entire sidelink common pool. In some aspects, prior to receiving the paging indication message, the first UE may utilize a dedicated resource pool (e.g., PRBs) on the sidelink channel. Figure 5 The first UE may then send a message to the second UE (using the P2V pool 506). The message may include data indicating at least the location of the first UE and an identifier of the first UE. The second UE may use the location data to determine the proximity of the first UE, and the identification data may be used in a paging message to identify the first UE as the recipient of the message. The process may then terminate.

[0079] Figure 7 is a flow diagram illustrating example operations 700 for using a paging indication message to indicate a specific set of one or more resources to be monitored, in accordance with certain aspects of the present disclosure. Figure 1 UE 120b in the wireless communication network 100 shown in FIG. 1 performs operations 700. Operations 700 may be implemented as a process in one or more processors (e.g., Figure 2 In addition, for example, the communication may be performed via one or more antennas (e.g., Figure 2The UE may transmit and receive signals in operation 700 using antenna 252. In certain aspects, the UE may transmit and / or receive signals by obtaining and / or outputting signals via a bus interface of one or more processors (e.g., controller / processor 280).

[0080] Operations 700 may begin at 702 by receiving a message by a first UE (e.g., associated with a vehicle, such as a VUE) from a second UE (e.g., associated with a person, such as a PUE). For example, the message may include a basic safety message. The message may include data identifying the second UE (e.g., an ID of the second UE) and other data, such as the location of the second UE. As described above, the second UE may use a dedicated P2V pool to send the message.

[0081] At 704, operations 700 may include, based on the received message, identifying, by the first UE, one or more resources of a common resource pool comprising a plurality of resources for communicating on a sidelink channel. For example, the first UE may perform sidelink channel sensing to identify time-frequency resources in the sidelink common pool that may be used to page and / or send a sidelink message to the second UE.

[0082] Then, at 706, operation 700 may send a paging indication message from the first UE to the second UE on the sidelink channel, where the paging indication message indicates one or more available resources for carrying the sidelink message from the first UE. For example, the paging indication message may be mapped to one or more specific time-frequency resources in the SL common pool resources. In this way, the second UE does not have to continuously monitor the entire bandwidth during the entire transmission time of the SL common pool. Instead, the second UE may monitor the sidelink channel on a specific bandwidth and only during a specific time period (e.g., in order to receive any subsequent messages sent by the first UE).

[0083] At 708, the operation 700 may include sending a second message from the first UE to the second UE in one or more resources. For example, when the first UE determines that the second UE is within a threshold distance of the vehicle and there is a risk of collision, the first UE may send the second message. The process may then end.

[0084] Figure 8 8 is a time-frequency diagram illustrating a sidelink paging indication message 815 carrying data explicitly mapped to specific time-frequency resources in the sidelink common pool 810 in accordance with certain aspects of the present disclosure. Figure 5As shown in FIG, the P2V / V2P pool includes a dedicated P2V pool 806 and a dedicated V2P paging pool 808. The P2V / V2P pool is followed by an SL common pool 810. In addition, a paging indication message 815 is shown sent in the V2P paging pool 808. The paging indication message 815 includes a UE ID 812 and / or a value 814 (e.g., a random seed corresponding to a sequence (e.g., of bits). The UE ID 812 and / or the value 814 can be mapped to one or more resources 830 that a UE receiving the paging indication message 815 monitors for sidelink messages.

[0085] More specifically, in some aspects, the time-frequency resources 830 that the Rx UE can monitor in the SL common pool 810 can depend on a combination of a value 814 sent by the Tx UE to the Rx UE and the ID of the Rx UE. The value 814 can be sent in the paging pool 808 (e.g., in one or more resources in the paging pool 808) along with the paging indication message 815 or sent in the paging indication message 815. The Rx UE can use the value 814 together with its UE ID to monitor only a portion of the SL common pool 810 (e.g., the time-frequency resources 830) to efficiently consume power.

[0086] In some aspects, the Rx UE may use a table (e.g., configured to the Rx UE, e.g., using radio resource control (RRC) signaling) to map the value 814 to the time-frequency resources 830 in the SL common pool 810. For example, the table may specify, for each value (e.g., of a random seed), the starting time slot, the starting PRB in each time slot, and the number of time slots / number of consecutive PRBs to monitor. For example, if the value 814 is 1, the table may indicate that the time-frequency resources 830 may include PRBs 10, 11, and 12 in the fourth time slot. In another example, if the value 814 is 2, the table may indicate that the time-frequency resources 830 may include PRBs 2 in the fifth and sixth time slots. In another example, if the value 814 is 3, the table may indicate that the time-frequency resources 830 may include PRBs 4, 5, and 6 in the fourth, fifth, and sixth time slots.

[0087] In some aspects, the Tx UE may derive the value 814 to be sent to the Rx UE in the paging indication message 815. For example, the mapping function from the UE-ID and the value 814 to the monitoring resources 830 in the SL common pool 810 may be calculated based on the formula "(UE.ID + value) modulo N", where N may represent the number of PRBs in the paging pool 808 (e.g., comprising m0 time slots). The modulo (or modulo) operation calculates the remainder when the divisor (UE.ID + value) is divided by N. Since the Tx UE knows the ID of the Rx UE and the value of N, the Tx UE may derive the value of the specific time-frequency resource 830 in the SL common pool 810 where the Tx UE intends to send a message to the Rx UE. The Tx UE may then send the derived value 814 in the PRBs allocated to the paging pool 808.

[0088] In some aspects, the Tx UE may select an Rx UE-specific paging indication sequence (e.g., paging indication message 815) by cyclically shifting a common paging sequence by L (e.g., L is a positive number) based on the ID of the Rx UE. For example, the Tx UE may cyclically shift the common paging sequence by "UE.ID modulo M," where M is the total possible shift. In some aspects, if X[n] represents a common paging sequence, a specific paging sequence may be obtained by the function "X[nL] modulo K]," where K is the length of the common length sequence.

[0089] Figure 9 is a time-frequency diagram illustrating sidelink paging indication messages implicitly mapped to specific time-frequency resources in the sidelink common pool according to certain aspects of the present disclosure. As shown, it is possible to identify that the resources 920 and 930 to be monitored are the SL common pool 910 based on which resources are used for the paging indication messages 915 and 917 in the paging pool 908. For example, based on the PRBs in which the paging indication messages 915 and 917 are sent, the monitored portions 920 and 930 of the SL common pool 910 may be different. Therefore, if the paging pool 908 is divided into M groups (M is a positive number), each group can be mapped to a set of PRBs in the SL common pool 910, where the Tx UE can send a sidelink message.

[0090] exist Figure 9In the example shown, the resources of the paging pool 808 are divided into four different groups (e.g., L1-L4). Therefore, there may be four different portions in the SL common pool 910 that can be identified by the paging pool 808. For example, if the Tx UE sends a paging indication message 915 in the time-frequency resource L2, the Rx UE determines that it should monitor the time-frequency resource 920 to receive potential SL messages from the Tx UE. Similarly, if the Tx UE sends a paging indication message 917 in the time-frequency resource L4, the Rx UE may monitor the time-frequency resource 930 in the SL common pool 910.

[0091] Figure 10 1 shows a communication device 1000, which may include various components (eg, corresponding to functional module components) configured to perform operations of the techniques disclosed herein, such as Figure 6-Figure 7 . The communication device 1000 may include a processing system 1002 coupled to a transceiver 1008 (e.g., a transmitter and / or a receiver). The transceiver 1008 may be configured to transmit and receive signals for the communication device 1000, such as the various signals described herein, via an antenna 1010. The processing system 1002 may be configured to perform processing functions for the communication device 1000, including processing signals received and / or transmitted by the communication device 1000.

[0092] The processing system 1002 may include a processor 1004 coupled to a computer-readable medium / memory 1012 via a bus 1006. In some aspects, the computer-readable medium / memory 1012 may be configured to store instructions (e.g., computer-executable code) that, when executed by the processor 1004, cause the processor 1004 to perform Figure 6 and Figure 7 , or other operations for performing the various techniques discussed herein for identifying resources in sidelink communications via sidelink paging. In certain aspects, the computer-readable medium / memory 1012 may store: code 1014 for receiving, at a first UE, a paging indication message from a second UE on a sidelink channel, the paging indication message associating the first UE with one or more resources of a common resource pool, the common resource pool comprising a plurality of resources for communicating on the sidelink channel; and code 1016 for monitoring, by the first UE, the one or more resources for messages from the second UE based on receiving the paging indication message.

[0093] In certain aspects, the processor 1004 may have circuitry configured to implement code stored in the computer-readable medium / memory 1012. The processor 1004 may include circuitry 1020 for receiving, at the first UE, a paging indication message from the second UE on a sidelink channel, the paging indication message associating the first UE with one or more resources of a common resource pool, the common resource pool including a plurality of resources for communicating on the sidelink channel; and circuitry 1022 for monitoring, by the first UE, the one or more resources for messages from the second UE based on receiving the paging indication message.

[0094] Figure 11 1 shows a communication device 1100, which may include various components (eg, corresponding to functional module components) configured to perform operations of the techniques disclosed herein, such as Figure 6-7 The operations shown in . The communication device 1100 may include a processing system 1102 coupled to a transceiver 1108 (e.g., a transmitter and / or a receiver). The transceiver 1108 may be configured to transmit and receive signals for the communication device 1100, such as the various signals described herein, via an antenna 1110. The processing system 1102 may be configured to perform processing functions for the communication device 1100, including processing signals received and / or to be transmitted by the communication device 1100.

[0095] The processing system 1102 may include a processor 1104 coupled to a computer-readable medium / memory 1112 via a bus 1106. In certain aspects, the computer-readable medium / memory 1112 may be configured to store instructions (e.g., computer-executable code) that, when executed by the processor 1104, cause the processor 1104 to perform Figure 6-7 , or other operations for performing the various techniques discussed herein for using sidelink paging to indicate resources in sidelink communications. In certain aspects, the computer-readable medium / memory 1112 may store: code 1114 for receiving a message at a first UE from a second UE; code 1116 for identifying, by the first UE, one or more resources of a common resource pool based on the received message, the common resource pool including a plurality of resources for communicating on a sidelink channel; and code 1118 for sending a paging indication message from the first UE to the second UE on the sidelink channel and sending a second message from the first UE to the second UE in the one or more resources, the paging indication message indicating the one or more resources.

[0096] In certain aspects, the processor 1104 may have circuitry configured to implement code stored in the computer-readable medium / memory 1112. The processor 1104 may include circuitry 1120 for receiving a message at a first UE from a second UE; circuitry 1122 for identifying, by the first UE, one or more resources of a common resource pool based on the received message, the common resource pool including a plurality of resources for communicating on a sidelink channel; and circuitry 1124 for sending a paging indication message from the first UE to the second UE on the sidelink channel indicating the one or more resources, and sending a second message from the first UE to the second UE in the one or more resources.

[0097] Exemplary embodiments

[0098] Embodiment 1: A method for wireless communication between a first user equipment (UE) and a second UE, comprising: at the first UE: receiving a paging indication message from the second UE on a sidelink channel, the paging indication message associating the first UE with one or more resources of a common resource pool, the common resource pool including multiple resources for communicating on the sidelink channel; and, based on receiving the paging indication message, monitoring the one or more resources for messages from the second UE.

[0099] Embodiment 2: The method according to embodiment 1, wherein the paging indication message includes a value mapped to the one or more resources, and further comprising: determining the one or more resources based on the value at the first UE.

[0100] Embodiment 3: The method of embodiment 2, wherein determining the one or more resources is further based on an identifier of the first UE, wherein the paging indication message is addressed to the identifier of the first UE.

[0101] Embodiment 4: The method according to any one of embodiments 2-3, wherein determining the one or more resources is based on at least one item in a mapping function or a mapping table that maps at least the value to the one or more resources.

[0102] Embodiment 5: The method according to embodiment 1, wherein the paging indication message is received in the one or more second resources, and further comprising: determining the one or more resources based on the one or more second resources at the first UE.

[0103] Embodiment 6: The method of embodiment 5, wherein determining the one or more resources is based on a mapping of resources used for paging indication messages to the plurality of resources of the common resource pool.

[0104] Embodiment 7: The method according to any one of embodiments 1-6, wherein the one or more resources include one or more time-frequency resources.

[0105] Embodiment 8: The method according to embodiment 7, wherein the one or more time-frequency resources include one or more physical resource blocks.

[0106] Example 9: The method according to any one of Examples 1-8 further includes: receiving a second paging indication message from a third UE on the sidelink channel, the second paging indication message associating the first UE with one or more other resources of the common resource pool; and, based on receiving the second paging indication message, monitoring the one or more other resources of the second message from the third UE.

[0107] Example 10: The method according to any one of Examples 1-9 further includes: before receiving the paging indication message, sending a second message using a dedicated resource pool on the sidelink channel, wherein the second message includes data indicating at least the location of the first UE and an identifier of the first UE.

[0108] Embodiment 11: The method of any one of embodiments 1-10, wherein the message indicates an event detected by the second UE.

[0109] Embodiment 12: The method of embodiment 11, wherein the first UE is associated with a pedestrian and the second UE is associated with a vehicle, wherein the event indicates a potential collision between the vehicle and the pedestrian.

[0110] Embodiment 13: The method of embodiment 11, wherein the first UE is associated with a vehicle and the second UE is associated with a roadside unit, wherein the event indicates a road hazard in the vicinity of the vehicle.

[0111] Embodiment 14: A method for wireless communication between a first user equipment (UE) and a second UE, comprising: at the first UE: receiving a message from the second UE; based on receiving the message, identifying one or more resources in a common resource pool, the common resource pool including a plurality of resources for communicating on a sidelink channel; sending a paging indication message to the second UE on the sidelink channel, the paging indication message indicating the one or more resources; and, sending a second message to the second UE in the one or more resources.

[0112] Embodiment 15: The method according to embodiment 14, wherein the paging indication message includes: a value mapped to the one or more resources.

[0113] Embodiment 16: The method according to embodiment 15 further includes: determining the value based on at least one item in a mapping function or a mapping table that maps the value to the one or more resources.

[0114] Embodiment 17: The method of embodiment 16, wherein determining the value is further based on an identifier of the second UE.

[0115] Embodiment 18: The method of embodiment 17, wherein the value is a common paging sequence that is cyclically shifted based on the identifier of the second UE.

[0116] Embodiment 19: The method according to any one of Embodiment 14 further includes: determining one or more second resources for sending the paging indication message based on the identified one or more resources.

[0117] Embodiment 20: The method of embodiment 19, wherein determining the one or more second resources is based on a mapping of resources used for paging indication messages to the plurality of resources of the common resource pool.

[0118] Embodiment 21: A method according to any one of embodiments 14-20, wherein the one or more resources include one or more time-frequency resources.

[0119] Embodiment 22: The method according to embodiment 21, wherein the one or more time-frequency resources include one or more physical resource blocks.

[0120] Embodiment 23: The method of any one of embodiments 14-22, wherein identifying the one or more resources comprises sensing the sidelink channel for available resources.

[0121] Embodiment 24: The method of any one of Embodiments 14-23, wherein the message includes data indicating at least a location of the second UE and an identifier of the second UE.

[0122] Embodiment 25: The method of embodiment 24, wherein the second message indicates an event detected by the first UE.

[0123] Example 26: A method according to Example 25, wherein the first UE is associated with a vehicle and the second UE is associated with a pedestrian, and further comprising: determining a possible impact between the second UE and the vehicle based on the position of the second UE, wherein the identification is further based on the possible impact, and wherein the event includes the possible impact.

[0124] Embodiment 27: The method of embodiment 25, wherein the second UE is associated with a vehicle and the first UE is associated with a roadside unit, wherein the event indicates a road hazard near the vehicle.

[0125] Embodiment 28: A first user equipment (UE), comprising: a memory; and a processor coupled to the memory, wherein the memory and the processor are configured to execute the method according to one or more embodiments of embodiments 1-27.

[0126] Embodiment 29: A first user equipment (UE), comprising: various units for executing the method according to one or more embodiments of embodiments 1-27.

[0127] Embodiment 30: A non-transitory computer-readable medium comprising instructions, which, when executed by a first user equipment (UE), cause the first UE to perform the method according to one or more of embodiments 1-27.

[0128] The techniques described herein can be used for various wireless communication technologies, such as NR (e.g., 5G NR), 3GPP Long Term Evolution (LTE), Advanced LTE (LTE-A), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), Time Division Synchronous Code Division Multiple Access (TD-SCDMA), and other networks. The terms "network" and "system" are often used interchangeably. A CDMA network can implement radio technologies such as Universal Terrestrial Radio Access (UTRA) and cdma2000. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. cdma2000 covers the IS-2000 standard, the IS-95 standard, and the IS-856 standard. A TDMA network can implement radio technologies such as Global System for Mobile Communications (GSM). OFDMA networks can implement radio technologies such as NR (e.g., 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, and the like. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). LTE and LTE-A are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization called the 3rd Generation Partnership Project (3GPP). cdma2000 and UMB are described in documents from an organization called the 3rd Generation Partnership Project 2 (3GPP2). NR is an emerging wireless communication technology under development.

[0129] In 3GPP, the term "cell" can refer to the coverage area of a Node B (NB) and / or the NB subsystem serving that coverage area, depending on the context in which the term is used. In NR systems, the terms "cell" and "base station," next-generation Node B (gNB or gNodeB), access point (AP), distributed unit (DU), carrier, or transmit / receive point (TRP) are used interchangeably. A base station (BS) can provide communication coverage for macrocells, picocells, femtocells, and / or other types of cells. A macrocell can cover a relatively large geographic area (e.g., several kilometers in radius) and can allow unrestricted access to UEs with service subscriptions. A picocell can cover a relatively small geographic area and can allow unrestricted access to UEs with service subscriptions. A femtocell can cover a relatively small geographic area (e.g., a home) and can allow restricted access to UEs associated with the femtocell (e.g., UEs in a closed subscriber group (CSG) or UEs for users in a home). A base station for a macrocell can be referred to as a macro BS. A base station for a picocell can be referred to as a pico BS. A base station for a femtocell can be referred to as a femto BS or a home BS.

[0130] A UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a customer premises equipment (CPE), a cellular phone, a smartphone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, an appliance, a medical device or medical apparatus, a biometric sensor / device, a wearable device such as a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring, a smart bracelet, etc.), an entertainment device (e.g., a music device, a video device, a satellite radio, etc.), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium. Some UEs may be considered machine type communication (MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node can provide connectivity to or from a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs can be considered Internet of Things (IoT) devices, which can be narrowband IoT (NB-IoT) devices.

[0131] In some examples, access to the air interface can be scheduled. A scheduling entity (e.g., BS) allocates resources for communication between some or all devices and apparatuses within its service area or cell. A scheduling entity can be responsible for scheduling, allocating, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communications, the subordinate entity adopts the resources allocated by the scheduling entity. The base station is not the only entity that can act as a scheduling entity. In some examples, a UE can serve as a scheduling entity and can schedule resources for one or more subordinate entities (e.g., one or more other UEs), and other UEs can utilize the resources scheduled by the UE for wireless communication. In some examples, a UE can serve as a scheduling entity in a point-to-point (P2P) network and / or in a mesh network. In the mesh network example, in addition to communicating with the scheduling entity, UEs can also communicate directly with each other.

[0132] The methods disclosed herein include one or more steps or actions for implementing these methods. Method steps and / or actions may be interchangeable with each other without departing from the scope of the claims. In other words, unless a specific order of steps or actions is specified, the order and / or use of the specific steps and / or actions may be modified without departing from the scope of the claims.

[0133] As used herein, a phrase referring to "at least one of" a list of items refers to any combination of those items, including single members. For example, "at least one of a, b, or c" is intended to encompass a, b, c, ab, ac, bc, and abc, as well as any combination and multiples of the same element (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other order of a, b, and c).

[0134] As used herein, the term "determine" encompasses a wide variety of actions. For example, "determine" may include calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, database, or other data structure), ascertaining, and the like. Furthermore, "determine" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), and the like. Furthermore, "determine" may include resolving, selecting, choosing, establishing, and the like.

[0135] The preceding description is provided to enable those skilled in the art to implement the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. Accordingly, the claims are not intended to be limited to the several aspects shown herein, but rather to the full scope consistent with the claim language, wherein, unless otherwise specified, references to singular elements are not intended to mean "one and only one," but rather "one or more." Unless otherwise specifically stated, the term "some" refers to one or more. All structural and functional equivalents to the elements described throughout this disclosure that are known or later become known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be covered by the claims. Furthermore, nothing disclosed herein is intended to be dedicated to the public, regardless of whether such disclosure is explicitly recited in the claims. No claim shall be construed under 35 U.S.C. § 112(f) unless the element is explicitly recited using the phrase "means for..." or, in the case of a method claim, the phrase "step for..."

[0136] The various operations of the above method can be performed by any suitable unit capable of performing the corresponding functions. The unit may include various hardware and / or software components and / or modules, including but not limited to circuits, application specific integrated circuits (ASICs) or processors. Generally, in the case of the operations shown in the figures, those operations may have corresponding corresponding functional module components with similar numbers.

[0137] The various illustrative logical blocks, modules, and circuits described in conjunction with the present disclosure may be implemented or executed with a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but alternatively, the processor may be any commercially available processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in combination with a DSP core, or any other such configuration.

[0138] If implemented in hardware, an exemplary hardware configuration may include a processing system in a wireless node. The processing system may be implemented using a bus architecture. The bus may include any number of interconnecting buses and bridges, depending on the specific application and overall design constraints of the processing system. The bus may link various circuits (including processors, machine-readable media, and bus interfaces) together. The bus interface may be used to connect a network adapter, etc., to the processing system via the bus. The network adapter may be used to implement the signal processing functions of the PHY layer. In the case of a user terminal (see Figure 1 ), a user interface (e.g., keyboard, display, mouse, joystick, etc.) may also be connected to the bus. The bus may also link various other circuits, such as timing sources, peripherals, voltage regulators, power management circuits, etc., which are well known in the art and will not be described further. The processor may be implemented using one or more general and / or special purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuits capable of executing software. Those skilled in the art will recognize how to best implement the described functionality for the processing system depending on the specific application and the overall design constraints imposed on the entire system.

[0139] If implemented in software, these functions may be stored or transmitted as one or more instructions or codes via a computer-readable medium. Software should be broadly interpreted to mean instructions, data, or any combination thereof, whether referring to software, firmware, middleware, microcode, hardware description language, or otherwise. Computer-readable media include computer storage media and communication media, including any medium that facilitates the transfer of a computer program from one location to another. The processor may be responsible for managing the bus and general processing, including executing software modules stored on a machine-readable storage medium. The computer-readable storage medium may be coupled to the processor so that the processor can read information from and write information to the storage medium. Alternatively, the storage medium may be an integral part of the processor. As examples, the machine-readable medium may include a transmission line, a carrier modulated with data, and / or a computer-readable storage medium storing instructions separate from the wireless node, all of which may be accessed by the processor via a bus interface. Alternatively or in addition, the machine-readable medium or any portion thereof may be integrated into the processor, such as may be the case with a cache and / or general register file. As examples, examples of machine-readable storage media may include, for example, RAM (random access memory), flash memory, ROM (read-only memory), PROM (programmable read-only memory), EPROM (erasable programmable read-only memory), EEPROM (electrically erasable programmable read-only memory), registers, magnetic disks, optical disks, hard drives, or any other suitable storage media, or any combination thereof. The machine-readable medium may be embodied in a computer program product.

[0140] A software module may include a single instruction or many instructions and may be distributed across several different code segments, different programs, and multiple storage media. A computer-readable medium may include multiple software modules. A software module includes instructions that, when executed by a device such as a processor, cause a processing system to perform various functions. A software module may include a sending module and a receiving module. Each software module may reside in a single storage device or be distributed across multiple storage devices. For example, when a triggering event occurs, a software module may be loaded from a hard drive into RAM. During execution of a software module, the processor may load some instructions into a cache to increase access speed. One or more caches may then be loaded into a general register file for execution by the processor. When referring to the functions of a software module below, it should be understood that these functions are implemented by the processor when instructions are executed from the software module.

[0141] Furthermore, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared (IR), radio, and microwave, then the definition of medium includes the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave. Disk and disc, as used herein, include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Optical disks, where magnetic disks typically reproduce data magnetically, and optical disks reproduce data optically using lasers. Thus, in some aspects, computer-readable media may include non-transitory computer-readable media (e.g., tangible media). Furthermore, for other aspects, computer-readable media may include transitory computer-readable media (e.g., signals). Combinations of the above should also be included within the scope of computer-readable media.

[0142] Thus, certain aspects may include a computer program product for performing the operations presented herein. For example, such a computer program product may include a computer-readable medium having instructions stored (and / or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein. For example, the instructions are for performing the operations described herein and Figure 6-Figure 7 The operations shown in .

[0143] In addition, it should be understood that the modules and / or other appropriate units for performing the methods and techniques described herein can be downloaded and / or otherwise obtained by the user terminal and / or base station when appropriate. For example, such a device can be coupled to a server to facilitate the transmission of units for performing the methods described herein. Alternatively, the various methods described herein can be provided via a storage device (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or a floppy disk) so that the user terminal and / or base station can obtain the various methods when the storage unit is coupled or provided to the device. In addition, any other suitable technology for providing the methods and techniques described herein to a device can be used.

[0144] It should be understood that the claims are not limited to the precise configuration and components illustrated above, and that various modifications, changes and variations may be made in the arrangement, operation and details of the methods and apparatus described above without departing from the scope of the claims.

Claims

1. A first user equipment (UE), comprising: Memory; as well as a processor coupled to the memory, the processor and the memory being configured to: receiving a paging indication message from a second UE on a sidelink channel, the paging indication message associating the first UE with one or more resources in a common resource pool, the common resource pool comprising a plurality of resources for communicating on the sidelink channel; as well as Based on receiving the paging indication message, the one or more resources are monitored for messages from the second UE.

2. The first UE according to claim 1, wherein: The paging indication message includes a value mapped to the one or more resources, and wherein the processor and memory are further configured to determine the one or more resources based on the value.

3. The first UE according to claim 2, wherein: Determining the one or more resources is further based on an identifier of the first UE, wherein the paging indication message is addressed to the identifier of the first UE.

4. The first UE according to claim 1, wherein: The paging indication message is received in one or more second resources, and wherein the processor and the memory are further configured to determine the one or more resources based on the one or more second resources, wherein the determination of the one or more resources is based on a mapping of resources used for the paging indication message to the multiple resources of the common resource pool. The first UE according to claim 1 , wherein: The one or more resources include one or more time-frequency resources. The first UE according to claim 1 , wherein: The processor and memory are further configured to: receiving a second paging indication message from a third UE on the sidelink channel, the second paging indication message associating the first UE with one or more other resources of the common resource pool; as well as Based on receiving the second paging indication message, monitoring the one or more other resources for a second message from the third UE.

7. The first UE according to claim 1, wherein: The message indicates an event detected by the second UE.

8. A first user equipment (UE), comprising: Memory; as well as a processor coupled to the memory, the processor and the memory being configured to: receiving a message from a second UE; identifying, based on receiving the message, one or more resources in a common resource pool, the common resource pool comprising a plurality of resources for communicating on a sidelink channel; sending a paging indication message to the second UE on the sidelink channel, the paging indication message indicating the one or more resources; as well as A second message is sent to the second UE in the one or more resources.

9. The first UE according to claim 8, wherein: The paging indication message includes values mapped to the one or more resources.

10. The first UE according to claim 9, wherein: Determining the value is further based on an identifier of the second UE. The first UE according to claim 10 , wherein: The value is a common paging sequence that is cyclically shifted based on the identifier of the second UE.

12. The first UE according to claim 8, wherein: The processor and the memory are also configured to determine one or more second resources for sending the paging indication message based on the identified one or more resources, wherein the determination of the one or more second resources is based on a mapping of the resources used for the paging indication message to the multiple resources of the common resource pool.

13. The first UE according to claim 8, wherein: The one or more resources include one or more time-frequency resources.

14. The first UE according to claim 8, wherein: Identifying the one or more resources includes sensing the sidelink channel for available resources.

15. The first UE according to claim 8, wherein: The message comprises data indicating at least the location of the second UE and an identifier of the second UE. The first UE according to claim 15 , wherein: The second message indicates an event detected by the first UE.

17. A method for wireless communication between a first user equipment (UE) and a second UE, comprising: At the first UE: receiving a paging indication message from the second UE on a sidelink channel, the paging indication message associating the first UE with one or more resources of a common resource pool, the common resource pool including a plurality of resources for communicating on the sidelink channel; as well as Based on receiving the paging indication message, the one or more resources are monitored for messages from the second UE.

18. The method according to claim 17, wherein The paging indication message includes a value mapped to the one or more resources, and further includes determining, at the first UE, the one or more resources based on the value.

19. The method according to claim 18, wherein Determining the one or more resources is further based on an identifier of the first UE, wherein the paging indication message is addressed to the identifier of the first UE.

20. The method according to claim 17, wherein The paging indication message is received in one or more second resources, and also includes: determining the one or more resources based on the one or more second resources at the first UE, wherein the determination of the one or more resources is based on a mapping of resources used for the paging indication message to the multiple resources in the common resource pool.

21. The method of claim 17, further comprising: receiving a second paging indication message from a third UE on the sidelink channel, the second paging indication message associating the first UE with one or more other resources in the common resource pool; as well as Based on receiving the second paging indication message, the one or more other resources are monitored for a second message from the third UE.

22. The method according to claim 17, wherein The message indicates an event detected by the second UE.

23. A method for wireless communication between a first user equipment (UE) and a second UE, comprising: At the first UE: receiving a message from the second UE; identifying, based on receiving the message, one or more resources in a common resource pool, the common resource pool comprising a plurality of resources for communicating on a sidelink channel; sending a paging indication message to the second UE on the sidelink channel, the paging indication message indicating the one or more resources; as well as A second message is sent to the second UE in the one or more resources.

24. The method according to claim 23, wherein The paging indication message includes values mapped to the one or more resources.

25. The method according to claim 24, wherein Determining the value is further based on an identifier of the second UE.

26. The method according to claim 25, wherein The value is a common paging sequence that is cyclically shifted based on the identifier of the second UE.

27. The method of claim 23, further comprising: One or more second resources for sending the paging indication message are determined based on the identified one or more resources, wherein determining the one or more second resources is based on a mapping of resources for the paging indication message to the plurality of resources of the common resource pool.

28. The method according to claim 23, wherein Identifying the one or more resources includes sensing the sidelink channel for available resources.

29. The method according to claim 23, wherein The message comprises data indicating at least a location of the second UE and an identifier of the second UE.

30. The method according to claim 29, wherein The second message indicates an event detected by the first UE.

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