Techniques for relaying resource reservation information on sidelink

Abstract

In general, various aspects of the present disclosure relate to wireless communications. In some aspects, a first wireless communication device may receive resource reservation information associated with a second wireless communication device from the second wireless communication device on a sidelink. The resource reservation information may identify sidelink resources reserved for the second wireless communication device for transmissions on the sidelink. The first wireless communication device may send resource reservation information on a sidelink to a third wireless communication device. Numerous other aspects are provided.

Description

[0001] This application is a divisional application of a Chinese patent application with an application date of January 27, 2021, an application number of 202180015074.0, and an invention title of "Techniques for Relaying Resource Reservation Information on Sidelink".

[0002] Claims priority under 35 U.S.C.§119

[0003] This patent application claims the benefit of priority and the right of priority to U.S. Non - Provisional Application No. 16 / 800,856, filed on February 25, 2020, and the above - mentioned application is hereby incorporated herein by reference in its entirety. Technical Field

[0004] Broadly speaking, aspects of the present disclosure relate to wireless communication, and relate to techniques for relaying resource reservation information on a sidelink and apparatuses for such techniques. Background Art

[0005] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. A typical wireless communication system may employ a multiple - access technology capable of supporting communication with multiple user equipments (UEs) by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple - access technologies include code - division multiple - access (CDMA) systems, time - division multiple - access (TDMA) systems, frequency - division multiple - access (FDMA) systems, orthogonal frequency - division multiple - access (OFDMA) systems, single - carrier frequency - division multiple - access (SC - FDMA) systems, time - division synchronous code - division multiple - access (TD - SCDMA) systems, and Long - Term Evolution (LTE). LTE / Advanced LTE is an enhanced set of the Universal Mobile Telecommunications System (UMTS) mobile standard released by the Third Generation Partnership Project (3GPP).

[0006] A wireless communication network may include multiple base stations (BSs) capable of supporting communication for multiple user equipments (UEs). A user equipment (UE) may communicate with a base station (BS) via a downlink and an uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, access point (AP), radio head, transmission and reception point (TRP), New Radio (NR) BS, 5G Node B, etc.

[0007] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate at the urban, national, regional, and even global levels. New Radio (NR) (which may also be referred to as 5G) is an enhanced set of the LTE mobile standard released by the Third Generation Partnership Project (3GPP). NR is designed to better integrate with other open standards by improving spectral efficiency, reducing costs, enhancing services, leveraging new spectrums, and using Orthogonal Frequency Division Multiplexing with Cyclic Prefix (CP-OFDM) on the downlink (DL), and CP-OFDM and / or SC-FDM (e.g., also referred to as Discrete Fourier Transform Spread OFDM (DFT-s-OFDM)) on the uplink (UL), so as to better support mobile broadband Internet access, as well as support beamforming, Multiple-Input Multiple-Output (MIMO) antenna technology, and carrier aggregation. However, as the demand for mobile broadband access continues to grow, there is a need for further improvement in LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and the telecommunication standards that employ these technologies. Summary of the Invention

[0008] In some aspects, a method of wireless communication performed by a first wireless communication device may include: receiving, on a sidelink, resource reservation information associated with the second wireless communication device, where the resource reservation information identifies sidelink resources reserved for the second wireless communication device for transmission on the sidelink; and sending the resource reservation information to a third wireless communication device on the sidelink.

[0009] In a first aspect, sending the resource reservation information to the third wireless communication device includes: sending the resource reservation information together with other resource reservation information associated with the first wireless communication device. In a second aspect, alone or in combination with the first aspect, sending the resource reservation information to the third wireless communication device includes: sending the resource reservation information in a second part of two-part sidelink control information communication on a Physical Sidelink Shared Channel.

[0010] In a third aspect, either alone or in combination with one or more of the first and second aspects, sending the resource reservation information to the third wireless communication device includes: sending the resource reservation information in a media access control control element communication together with other shared data on a physical sidelink shared channel. In a fourth aspect, either alone or in combination with one or more of the first to third aspects, sending the resource reservation information to the third wireless communication device includes: sending the resource reservation information in a media access control control element communication on a physical sidelink shared channel without other shared channel data.

[0011] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, sending the resource reservation information to the third wireless communication device includes: sending the resource reservation information in a first part of a two-part sidelink control information communication on a physical sidelink control channel. In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, the resource reservation information includes at least one of the following: an indication of one or more frequency domain resources for transmission by the second wireless communication device on the sidelink, an indication of one or more time domain resources for transmission by the second wireless communication device on the sidelink, a source identifier associated with the second wireless communication device, a destination identifier associated with a destination wireless communication device for one or more sidelink communications to be sent by the second wireless communication device on the sidelink, a hybrid automatic repeat request identifier for the one or more sidelink communications, a region identifier associated with the second wireless communication device, a region identifier associated with the first wireless communication device, or a reference signal received power measurement generated by the first wireless communication device and used for the second wireless communication device.

[0012] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the method includes: receiving, on the sidelink, other resource reservation information associated with one or more fourth wireless communication devices; and sending the resource reservation information to the third wireless communication device includes: sending the resource reservation information to the third wireless communication device together with the other resource reservation information. In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, sending the resource reservation information to the third wireless communication device includes: sending the resource reservation information to the third wireless communication device and one or more fourth wireless communication devices.

[0013] In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, the sidelink resources are autonomously reserved by the second wireless communication device. In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, the sidelink resources are allocated by a base station to the second wireless communication device. In an eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, each of the first wireless communication device, the second wireless communication device, and the third wireless communication device is a user equipment or a roadside unit.

[0014] In some aspects, a first wireless communication device for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: receive, on a sidelink, resource reservation information associated with a second wireless communication device, wherein the resource reservation information identifies sidelink resources reserved for the second wireless communication device for transmission on the sidelink; and transmit the resource reservation information on the sidelink to a third wireless communication device.

[0015] In a first aspect, when transmitting the resource reservation information to the third wireless communication device, the one or more processors are configured to: transmit the resource reservation information together with other resource reservation information associated with the first wireless communication device. In a second aspect, either alone or in combination with the first aspect, when transmitting the resource reservation information to the third wireless communication device, the one or more processors are configured to: transmit the resource reservation information in a second part of two-part sidelink control information communication on a physical sidelink shared channel.

[0016] In a third aspect, either alone or in combination with one or more of the first and second aspects, when transmitting the resource reservation information to the third wireless communication device, the one or more processors are configured to: transmit the resource reservation information in a media access control control element communication together with other shared data on a physical sidelink shared channel. In a fourth aspect, either alone or in combination with one or more of the first to third aspects, when transmitting the resource reservation information to the third wireless communication device, the one or more processors are configured to: transmit the resource reservation information in a media access control control element communication on a physical sidelink shared channel without other shared channel data.

[0017] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, when sending the resource reservation information to the third wireless communication device, the one or more processors are configured to: send the resource reservation information in a first part of a two-part sidelink control information communication on a physical sidelink control channel. In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, the resource reservation information includes at least one of the following: an indication of one or more frequency domain resources for transmission by the second wireless communication device on the sidelink, an indication of one or more time domain resources for transmission by the second wireless communication device on the sidelink, a source identifier associated with the second wireless communication device, a destination identifier associated with a destination wireless communication device for one or more sidelink communications to be sent by the second wireless communication device on the sidelink, a hybrid automatic repeat request identifier for the one or more sidelink communications, a region identifier associated with the second wireless communication device, a region identifier associated with the first wireless communication device, or a reference signal received power measurement generated by the first wireless communication device and used by the second wireless communication device.

[0018] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the one or more processors are further configured to: receive other resource reservation information associated with the one or more fourth wireless communication devices on the sidelink; and when sending the resource reservation information to the third wireless communication device, the one or more processors are configured to: send the resource reservation information together with the other resource reservation information to the third wireless communication device. In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, when sending the resource reservation information to the third wireless communication device, the one or more processors are configured to: send the resource reservation information to the third wireless communication device and one or more fourth wireless communication devices.

[0019] In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, the sidelink resources are autonomously reserved by the second wireless communication device. In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, the sidelink resources are allocated by a base station to the second wireless communication device. In an eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, each of the first wireless communication device, the second wireless communication device, and the third wireless communication device is a user equipment or a roadside unit.

[0020] In some aspects, a non-transitory computer-readable medium can store one or more instructions for wireless communication. When the one or more instructions are executed by one or more processors of a first wireless communication device, the one or more processors can be caused to perform the following operations: receive, on a sidelink, resource reservation information associated with a second wireless communication device, where the resource reservation information identifies sidelink resources reserved for the second wireless communication device for transmission on the sidelink; and transmit the resource reservation information to a third wireless communication device on the sidelink.

[0021] In a first aspect, the one or more instructions that cause the one or more processors to transmit the resource reservation information to the third wireless communication device cause the one or more processors to perform the following operations: transmit the resource reservation information together with other resource reservation information associated with the first wireless communication device. In a second aspect, either alone or in combination with the first aspect, the one or more instructions that cause the one or more processors to transmit the resource reservation information to the third wireless communication device cause the one or more processors to perform the following operations: transmit the resource reservation information in a second part of a two-part sidelink control information communication on a physical sidelink shared channel.

[0022] In a third aspect, either alone or in combination with one or more of the first and second aspects, the one or more instructions that cause the one or more processors to transmit the resource reservation information to the third wireless communication device cause the one or more processors to perform the following operations: transmit the resource reservation information in a media access control control element communication together with other shared data on a physical sidelink shared channel. In a fourth aspect, either alone or in combination with one or more of the first through third aspects, the one or more instructions that cause the one or more processors to transmit the resource reservation information to the third wireless communication device cause the one or more processors to perform the following operations: transmit the resource reservation information in a media access control control element communication on a physical sidelink shared channel in the absence of other shared channel data.

[0023] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the one or more instructions that cause the one or more processors to send the resource reservation information to the third wireless communication device cause the one or more processors to perform the following operations: send the resource reservation information in a first part of a two-part sidelink control information communication on a physical sidelink control channel. In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, the resource reservation information includes at least one of the following: an indication of one or more frequency-domain resources for transmission by the second wireless communication device on the sidelink, an indication of one or more time-domain resources for transmission by the second wireless communication device on the sidelink, a source identifier associated with the second wireless communication device, a destination identifier associated with a destination wireless communication device for one or more sidelink communications to be sent by the second wireless communication device on the sidelink, a hybrid automatic repeat request identifier for the one or more sidelink communications, a region identifier associated with the second wireless communication device, a region identifier associated with the first wireless communication device, or a reference signal received power measurement generated by the first wireless communication device and used for the second wireless communication device.

[0024] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the one or more instructions, when executed by the one or more processors, further cause the one or more processors to perform the following operations: receive other resource reservation information associated with the one or more fourth wireless communication devices on the sidelink; and the one or more instructions that cause the one or more processors to send the resource reservation information to the third wireless communication device are configured to: send the resource reservation information together with the other resource reservation information to the third wireless communication device. In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the one or more instructions that cause the one or more processors to send the resource reservation information to the third wireless communication device cause the one or more processors to perform the following operations: send the resource reservation information to the third wireless communication device and the one or more fourth wireless communication devices.

[0025] In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, the sidelink resource is autonomously reserved by the second wireless communication device. In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, the sidelink resource is allocated by a base station to the second wireless communication device. In an eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, each of the first wireless communication device, the second wireless communication device, and the third wireless communication device is a user equipment or a roadside unit.

[0026] In some aspects, a first apparatus for wireless communication may include: a unit for receiving, on a sidelink, resource reservation information associated with a second apparatus, wherein the resource reservation information identifies sidelink resources reserved for the second apparatus for transmission on the sidelink; and a unit for sending the resource reservation information to a third apparatus on the sidelink.

[0027] In a first aspect, the unit for sending the resource reservation information to the third wireless communication device includes: a unit for sending the resource reservation information together with other resource reservation information associated with the first wireless communication device. In a second aspect, either alone or in combination with the first aspect, the unit for sending the resource reservation information to the third wireless communication device includes: a unit for sending the resource reservation information in a second part of two-part sidelink control information communication on a physical sidelink shared channel.

[0028] In a third aspect, either alone or in combination with one or more of the first and second aspects, the unit for sending the resource reservation information to the third wireless communication device includes: a unit for sending the resource reservation information in a media access control control element communication together with other shared data on a physical sidelink shared channel. In a fourth aspect, either alone or in combination with one or more of the first to third aspects, the unit for sending the resource reservation information to the third wireless communication device includes: a unit for sending the resource reservation information in a media access control control element communication on a physical sidelink shared channel without other shared channel data.

[0029] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the unit for sending the resource reservation information to the third wireless communication device includes: a unit for sending the resource reservation information in a first part of two - part sidelink control information communication on a physical sidelink control channel. In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, the resource reservation information includes at least one of the following: an indication of one or more frequency - domain resources for transmission by the second wireless communication device on the sidelink, an indication of one or more time - domain resources for transmission by the second wireless communication device on the sidelink, a source identifier associated with the second wireless communication device, a destination identifier associated with a destination wireless communication device for one or more sidelink communications to be sent by the second wireless communication device on the sidelink, a hybrid automatic repeat request identifier for the one or more sidelink communications, a region identifier associated with the second wireless communication device, a region identifier associated with the first wireless communication device, or a reference signal received power measurement generated by the first wireless communication device and used by the second wireless communication device.

[0030] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the apparatus includes: a unit for receiving, on the sidelink, other resource reservation information associated with one or more fourth wireless communication devices from the one or more fourth wireless communication devices; and the unit for sending the resource reservation information to the third wireless communication device includes: a unit for sending the resource reservation information together with the other resource reservation information to the third wireless communication device. In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the unit for sending the resource reservation information to the third wireless communication device includes: a unit for sending the resource reservation information to the third wireless communication device and one or more fourth wireless communication devices.

[0031] In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, the sidelink resources are autonomously reserved by the second wireless communication device. In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, the sidelink resources are allocated by a base station to the second wireless communication device. In an eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, each of the first wireless communication device, the second wireless communication device, and the third wireless communication device is a user equipment or a roadside unit.

[0032] Broadly speaking, aspects include methods, apparatuses, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as fully described herein with reference to the accompanying drawings and the specification and as illustrated by the accompanying drawings and the specification.

[0033] The foregoing has outlined rather broadly the features and technical advantages of examples in accordance with the present disclosure so that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. When considered in conjunction with the accompanying drawings, the characteristics (both their organization and method of operation) of the concepts disclosed herein, as well as the associated advantages, will be better understood from the following description. Each of the drawings in the accompanying drawings is provided for purposes of illustration and description and is not to be construed as a definition of the limitations of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] To obtain a more specific description of the inventive concepts briefly outlined above, reference may be made to aspects, some of which are illustrated in the accompanying drawings. It should be noted, however, that the drawings only illustrate certain typical aspects of the present disclosure and are not to be considered as limiting the scope of the present disclosure, as the description may admit other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0035] Figure 1 is a diagram illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0036] Figure 2A and 2B is a diagram illustrating an example of a base station, user equipment, and roadside unit communicating in a wireless network in accordance with various aspects of the present disclosure.

[0037] Figure 3A and 3B is a diagram illustrating one or more examples of relaying resource reservation information on a sidelink in accordance with various aspects of the present disclosure.

[0038] Figure 4 is a diagram illustrating an example process, such as may be performed by a wireless communication device, in accordance with various aspects of the present disclosure.

[0039] Figure 5 is a conceptual data flow diagram illustrating the data flow between different components in an example apparatus in accordance with various aspects of the present disclosure. DETAILED DESCRIPTION

[0040] Aspects of the present disclosure are more fully described below with reference to the accompanying drawings. However, the present disclosure may be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art should appreciate that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether implemented independently of any other aspect of the present disclosure or in combination with any other aspect. For example, an apparatus 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 an apparatus or method implemented using other structures, functions, or combinations of structures and functions in addition to or different from the aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein may be embodied by one or more elements of a claim.

[0041] Certain aspects of a telecommunications system will now be presented with reference to various apparatuses and techniques. These apparatuses and techniques will be described in the following detailed description by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"), and illustrated in the accompanying drawings. These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

[0042] It should be noted that although terms commonly associated with 3G and / or 4G wireless technologies may be used herein to describe aspects, aspects of the present disclosure may be applied to communication systems based on other generations (e.g., communication systems of 5G and later, including NR technologies).

[0043] Figure 1FIG. is a diagram of a wireless network 100 in which aspects of the present disclosure may be implemented. The wireless network 100 may be an LTE network or some other wireless network (e.g., a 5G or NR network). The wireless network 100 may include multiple BSs 110 (shown as BS110a, BS110b, BS110c, and BS110d) and other network entities. A BS is an entity that communicates with user equipment (UE) and may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, transmit receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to the coverage area of a BS and / or the BS subsystem serving that coverage area, depending on the context in which the term is used.

[0044] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., with a radius of several kilometers) and may allow unrestricted access by UEs with a service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with a service subscription. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed user group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 the example shown, BS110a may be a macro BS for macro cell 102a, BS110b may be a pico BS for pico cell 102b, and BS110c may be a femto BS for femto cell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB," "base station," "NR BS," "gNB," "TRP," "AP," "Node B," "5G NB," and "cell" may be used interchangeably herein.

[0045] In some aspects, a cell may not necessarily be stationary, and the geographic area of a cell may move according to the location of a moving BS. In some aspects, BSs may be interconnected with each other and / or with one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces (e.g., direct physical connections, virtual networks, and / or similar interfaces using any suitable transport network).

[0046] The wireless network 100 may also include relay stations. A relay station is an entity that can receive a data transmission from an upstream station (e.g., a BS or a UE) and send the data transmission to a downstream station (e.g., a UE or a BS). A relay station may also be a UE capable of relaying transmissions for other UEs. In Figure 1 In the example shown in, the relay station 110d may communicate with the macro BS 110a and the UE 120d to facilitate communication between the BS 110a and the UE 120d. A relay station may also be referred to as a relay BS, a relay base station, a repeater, etc.

[0047] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 watts).

[0048] The network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other directly or indirectly, e.g., via a wireless or wired backhaul.

[0049] UEs 120 (e.g., 120a, 120b, 120c) may be scattered throughout the wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, etc. A UE may be a cellular phone (e.g., a smart phone), 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 device, a camera, a gaming device, a netbook, a smartbook, a ultrabook, a medical device or apparatus, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet, etc.)), an entertainment device (e.g., a music or video device, or a satellite radio unit, 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.

[0050] Some UEs can be considered as Machine Type Communication (MTC) or evolved or enhanced Machine Type Communication (eMTC) UEs. 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 a connection 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, for example. Some UEs can be considered as Internet of Things (IoT) devices, and / or can be implemented as NarrowBand IoT (NB-IoT) devices. Some UEs can be considered as Customer Premises Equipment (CPE). The UE 120 can be included inside a housing that houses components of the UE 120, such as a processor component, a memory component, etc.

[0051] In general, any number of wireless networks can be deployed in a given geographical area. Each wireless network can support a specific RAT and can operate on one or more frequencies. The RAT can also be referred to as a radio technology, an air interface, etc. The frequency can also be referred to as a carrier, a frequency channel, etc. Each frequency can support a single RAT in a given geographical area to avoid interference between wireless networks of different RATs. In some cases, an NR or 5G RAT network can be deployed.

[0052] The wireless network 100 can include one or more Road Side Units (RSUs) 140, which can communicate with the UEs 120 and the BS 110 in the wireless network 100. The RSU 140 can be a wireless communication device that directly communicates with the UE 120 and / or other RSUs 140 in a V2X environment. The RSU 140 can be located near a road, for example, on a traffic light, on a light pole, on an overpass, and / or on other structures near the road. The RSU 140 can receive data, control information, security alerts, and / or other types of information, and can forward, relay, and / or otherwise send these types of information to other entities in (and / or outside of) the wireless network 100. For example, the RSU 140 can provide a basic security alert message to the UE 120, can receive and forward location information associated with the UE 120, and so on. In these environments, the UE 120 can be a V2X-enabled vehicle, can be deployed and associated with a vehicle or a pedestrian, etc.

[0053] In some aspects, two or more UEs 120 (e.g., shown as UEs 120a and 120e), two or more RSUs 140, and / or a UE 120 and an RSU 140 may communicate directly using one or more sidelink channels (e.g., without using the base station 110 as an intermediary for communicating with each other). For example, the UEs 120 and the RSUs 140 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, a V2X protocol (e.g., which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, etc.), a mesh network, etc. In such a case, some of the UEs 120 and the RSUs 140 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by the base station 110.

[0054] As noted above, Figure 1 is provided as an example. Other examples may be different from the example regarding Figure 1 described.

[0055] Figure 2A and 2B illustrates a block diagram of a design 200 of a base station 110, a UE 120, and an RSU 140 (which may be one of the base stations, one of the UEs, and an RSU in Figure 1 ). The base station 110 may be equipped with T antennas 234a through 234t, the UE 120 may be equipped with R antennas 252a through 252r, and the RSU 140 may be equipped with Q antennas 252a through 252q, where generally, T≥1, Q≥1, and R≥1.

[0056] As Figure 2A shown, at the base station 110, a transmit processor 220 may receive data for one or more UEs from a data source 212, select one or more modulation and coding schemes (MCSs) for the UE at least in part based on a channel quality indicator (CQI) received from each UE, process (e.g., encode and modulate) the data for the UE at least in part based on the MCSs selected for each UE, and provide data symbols for all UEs. The transmit processor 220 may receive data for one or more RSUs from the data source 212, select one or more MCSs for the RSU at least in part based on the CQI received from each RSU, process (e.g., encode and modulate) the data for the RSU at least in part based on the MCSs selected for each RSU, and provide data symbols for all RSUs.

[0057] The transmitting processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. The transmitting processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signal (PSS) and secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on data symbols, control symbols, overhead symbols, and / or reference symbols (if applicable), and may provide T output symbol streams to T modulators (MOD) 232a through 232t. Each modulator 232 may process the corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively. According to various aspects described in more detail below, synchronization signals may be generated using position encoding to convey additional information.

[0058] As Figure 2A shown, at the UE 120, antennas 252a through 252r may receive downlink signals from the base station 110 and / or other base stations, and may provide the received signals to demodulators (DEMOD) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, down-convert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. The MIMO detector 256 may obtain the received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols (if applicable), and provide the detected symbols. The receiving processor 258 may process (e.g., demodulate and decode) the detected symbols, provide the decoded data for the UE 120 to the data sink 260, and provide the decoded control information and system information to the controller / processor 280. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of the UE 120 may be included in a housing.

[0059] On the uplink, at the UE 120, the transmit processor 264 may receive and process data from the data source 262 and control information from the controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by the TX MIMO processor 266 (if applicable), further processed by the modulators 254a to 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, the uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain the decoded data and control information transmitted by the UE 120. The receive processor 238 may provide the decoded data to the data sink 239 and the decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0060] On the sidelink, antennas 252a to 252r may receive sidelink signals from other UEs 120 and / or from RSU 140, and may provide the received signals to DEMODs 254a to 254r, respectively. Each demodulator 254 may condition the received signal to obtain input samples. Each demodulator 254 may further process the input samples to obtain received symbols. The MIMO detector 256 may obtain received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols (if applicable), and provide the detected symbols. The receive processor 258 may process the detected symbols, provide decoded data for UE 120 to the data sink 260, and provide decoded control information and system information to the controller / processor 280. The channel processor may determine RSRP, RSSI, RSRQ, CQI, etc. for the sidelink. The transmit processor 264 may receive and process data from the data source 262 and control information from the controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by the TX MIMO processor 266 (if applicable), further processed by the modulators 254a to 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted on the sidelink to other UEs 120 and / or RSU 140.

[0061] As Figure 2B shown, at RSU 140, antennas 286a to 286q may receive downlink signals from base station 110 and / or other base stations, and may provide the received signals to DEMODs 287a to 287q, respectively. Each demodulator 287 may condition (e.g., filter, amplify, down-convert, and digitize) the received signal to obtain input samples. Each demodulator 287 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. The MIMO detector 288 may obtain received symbols from all Q demodulators 287a to 287q, perform MIMO detection on the received symbols (if applicable), and provide the detected symbols. The receive processor 289 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for RSU 140 to the data sink 290, and provide decoded control information and system information to the controller / processor 294. The channel processor may determine RSRP, RSSI, RSRQ, CQI, etc. In some aspects, one or more components of RSU 140 may be included in a housing.

[0062] On the uplink, at RSU 140, the transmitting processor 292 may receive and process data from the data source 293 and control information from the controller / processor 294 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmitting processor 292 may also generate reference symbols for one or more reference signals. The symbols from the transmitting processor 292 may be precoded by the TX MIMO processor 291 (if applicable), further processed by the modulators 287a to 287q (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, the uplink signals from RSU 140 and other RSUs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receiving processor 238 to obtain the decoded data and control information transmitted by RSU 140. The receiving processor 238 may provide the decoded data to the data sink 239 and the decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 283, a controller / processor 284, and a memory 285.

[0063] On the sidelink, antennas 286a through 286q may receive sidelink signals from UE 120 and / or from other RSU 140s, and may provide the received signals to DEMODs 287a through 287q, respectively. Each demodulator 287 may condition the received signal to obtain input samples. Each demodulator 287 may further process the input samples to obtain received symbols. The MIMO detector 288 may obtain received symbols from all Q demodulators 287a through 287r, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. The receive processor 289 may process the detected symbols, provide decoded data for RSU 140 to the data sink 29, and provide decoded control information and system information to the controller / processor 2974. The channel processor may determine RSRP, RSSI, RSRQ, CQI, etc. for the sidelink. The transmit processor 292 may receive and process data from the data source 293 and control information from the controller / processor 294 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 292 may also generate reference symbols for one or more reference signals. Symbols from the transmit processor 292 may be precoded by the TX MIMO processor 2991 (if applicable), further processed by modulators 287a through 287q (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted on the sidelink to UE 120 and / or other RSU 140s.

[0064] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, the controller / processor 294 of the RSU 140, and / or Figure 2A and / or any other component in 2B may perform one or more techniques associated with relaying resource reservation information on the sidelink, as described in more detail elsewhere in this document. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, the controller / processor 294 of the RSU 140, and / or Figure 2A and / or any other component in 2B may perform or direct the operation of, for example Figure 4 process 400 and / or the operation of other processes as described in this document. Memories 242, 282, and 295 may store data and program codes for the base station 110, the UE 120, and the RSU 140, respectively. In some aspects, memories 242, memory 282, and / or memory 294 may include non-transitory computer-readable media storing one or more instructions for wireless communication. For example, when executed by one or more processors of the base station 110, the UE 120, and / or the RSU 140, the one or more instructions may perform or direct the operation of, for example Figure 4Operations of process 400 and / or other processes described herein. The scheduler 246 may schedule the UE and / or RSU for data transmission on the downlink and / or uplink. In some aspects, the scheduler 246 may schedule the UE and / or RSU for data transmission on the sidelink.

[0065] In some aspects, the UE 120 may include: a unit for receiving, on the sidelink, resource reservation information associated with a second wireless communication device (e.g., a second UE 120 or an RSU 140), where the resource reservation information identifies sidelink resources reserved for the second wireless communication device for transmission on the sidelink; a unit for transmitting, on the sidelink, the resource reservation information to a third wireless communication device (e.g., a third UE 120 or another RSU 140); and so on. In some aspects, such a unit may include one or more components of the UE 120 described in conjunction with Figure 2A such as the controller / processor 280, the transmit processor 264, the TX MIMO processor 266, the MOD 254, the antenna 252, the DEMOD 254, the MIMO detector 256, the receive processor 258, etc.

[0066] In some aspects, the RSU 140 may include: a unit for receiving, on the sidelink, resource reservation information associated with a second wireless communication device (e.g., a UE 120 or a second RSU 140), where the resource reservation information identifies sidelink resources reserved for the second wireless communication device for transmission on the sidelink; a unit for transmitting, on the sidelink, the resource reservation information to a third wireless communication device (e.g., another UE 120 or a third RSU 140); and so on. In some aspects, such a unit may include one or more components of the RSU 140 described in conjunction with Figure 2B such as the controller / processor 294, the transmit processor 292, the TX MIMO processor 291, the MOD 287, the antenna 286, the DEMOD 287, the MIMO detector 288, the receive processor 289, etc.

[0067] As noted above, Figure 2A and 2B are provided as examples. Other examples may be different from those described with respect to Figure 2A and 2B described.

[0068] In a wireless network, a wireless communication device (e.g., a UE or an RSU) may use various resource reservation techniques to reserve sidelink resources for transmissions on a sidelink. For example, a BS may reserve sidelink resources for a wireless communication device and may send resource reservation information associated with the reserved sidelink resources to the wireless communication device. This may be referred to as NR mode 1 sidelink resource allocation. As another example, a wireless communication device may autonomously reserve sidelink resources without assistance from a BS. This may be referred to as NR mode 2 sidelink resource allocation.

[0069] To autonomously reserve sidelink resources for transmissions on a sidelink, a wireless communication device may monitor sidelink communications carrying resource reservation information associated with other wireless communication devices. The wireless communication device may determine available sidelink resources on the sidelink based at least in part on the resource reservation information from other wireless communication devices and may select sidelink resources for transmissions on the sidelink from the available sidelink resources.

[0070] In some cases, a wireless communication may miss or fail to receive resource reservation information from another wireless communication device. For example, a wireless communication device may experience interference, degraded sidelink channel conditions, temporary blockage or occlusion, etc., which may block sidelink communications carrying resource reservation information or may cause sidelink communications to be undecodable. As another example, a wireless communication device may operate in a half-duplex mode, in which case the wireless communication device may transmit or receive at a given time. Thus, when the wireless communication device is transmitting, the wireless communication device may not be able to receive sidelink communications carrying resource reservation information from other wireless communication devices.

[0071] If a wireless communication device misses or fails to receive resource reservation information from another wireless communication device, the wireless communication device may attempt to reserve sidelink resources that have already been reserved by another wireless communication device. This may cause sidelink communications from the wireless communication device to conflict on the sidelink, which may cause the sidelink communications to be undecodable. Thus, these conflicts increase the likelihood that sidelink communications will be discarded, which may lead to an increase in retransmissions of sidelink communications. In addition, if sidelink communications need to be retransmitted, these sidelink communications suffer increased latency, which may cause security issues in some V2X safety applications.

[0072] Some aspects described herein provide techniques for relaying resource reservation information on a sidelink. In some aspects, a first wireless communication device (e.g., UE 120 or RSU 140) may receive resource reservation information associated with a second wireless communication device on a sidelink. The first wireless communication device may forward, relay, and / or otherwise send the reservation information on the sidelink to other wireless communication devices.

[0073] In this way, if a third wireless communication device fails to receive the resource reservation information directly from the second wireless communication device (e.g., due to interference, due to the third wireless communication device transmitting when the resource reservation information would be received, etc.), the third wireless communication device may receive the resource reservation information from the first wireless communication device. This reduces and / or eliminates the likelihood that the third wireless communication device will attempt to reserve sidelink resources that have already been reserved for the second wireless communication device, which reduces and / or eliminates conflicts on the sidelink, reduces the likelihood that sidelink communications will be dropped, and reduces security issues in various V2X safety applications.

[0074] Figure 3A and 3B are diagrams illustrating one or more examples 300 of relaying resource reservation information on a sidelink in accordance with various aspects of the present disclosure. As Figure 3A and 3B shown, example 300 includes communications between a plurality of wireless communication devices (e.g., UE120 and / or RSU 140). In some aspects, wireless communication devices (e.g., wireless communication devices 1 through wireless communication device n) may be included in a wireless network such as wireless network 100. In some aspects, the wireless communication devices may communicate on a sidelink (e.g., without using BS110 as an intermediary to communicate with each other).

[0075] As shown in Figure 3A and indicated by reference numeral 302, wireless communication device 1 may send resource reservation information associated with wireless communication device 1 on a sidelink. In some aspects, wireless communication device 1 may send the resource reservation information on the sidelink to one or more other wireless communication devices such as wireless communication device 2, wireless communication device 3, etc.

[0076] In some aspects, the resource reservation information may identify one or more sidelink resources reserved for transmission on the sidelink for wireless communication device 1. For example, the resource reservation information may include: an indication of one or more frequency-domain resources (e.g., resource elements, resource blocks, sub-channels, sub-carriers, component carriers, etc.) for transmission on the sidelink, an indication of one or more time-domain resources (e.g., one or more symbols, one or more time slots, etc.) for transmission on the sidelink, and so on. In some aspects, one or more sidelink resources may be indicated by a binary bitmap, a resource reservation list, etc.

[0077] In some aspects, one or more sidelink resources may be reserved via NR mode 1 sidelink resource allocation, where BS110 reserves one or more sidelink resources for wireless communication device 1 and sends an indication of the one or more sidelink resources to wireless communication device 1 in a scheduling grant. In some aspects, one or more sidelink resources may be reserved via NR mode 2 sidelink resources, where wireless communication device 1 autonomously reserves one or more sidelink resources without assistance from BS110.

[0078] In some aspects, the resource reservation information may include a source identifier associated with wireless communication device 1. The source identifier may identify wireless communication device 1 as the source of one or more sidelink communications to be transmitted on the reserved sidelink resources. In some aspects, the resource reservation information may include a destination identifier. The destination identifier may identify the destination wireless communication device for one or more sidelink communications.

[0079] In some aspects, the resource reservation information may include a hybrid automatic repeat request (HARQ) identifier for one or more sidelink communications. The HARQ identifier may identify the HARQ process to be used for one or more sidelink communications. In some aspects, the resource reservation information may include a region identifier associated with wireless communication device 1. The region identifier may identify the region in the cell of the BS where wireless communication device 1 is located. In some aspects, the resource reservation information may include other location information associated with wireless communication device 1.

[0080] In some aspects, wireless communication device 1 may send a resource reservation to one or more other wireless communication devices on the physical sidelink control channel (PSCCH). For example, wireless communication device 1 may send a resource reservation in the first part of the sidelink control information (SCI-1) on the PSCCH. SCI-1 may be the first part of a two-part SCI communication sent by wireless communication device 1.

[0081] As in Figure 3BAs shown in the figure and by reference numeral 304, other wireless communication devices (e.g., wireless communication device 2 to wireless communication device n) may forward, relay, and / or otherwise send resource reservation information associated with wireless communication device 1 to one or more wireless communication devices on the sidelink. For example, wireless communication device 2 may forward, relay, and / or otherwise send the resource reservation information to one or more of wireless communication devices 3 to wireless communication device n on the sidelink, and wireless communication device 3 may forward, relay, and / or otherwise send the resource reservation information to one or more of wireless communication device 2 and / or wireless communication devices 4 to wireless communication device n on the sidelink, and so on.

[0082] In some aspects, a wireless communication device may forward, relay, and / or otherwise send resource reservation information to one or more other wireless communication devices on the sidelink by sending the resource reservation information in SCI-1 on the PSCCH. In these cases, the SCI-1 of the wireless communication device may repeat the SCI-1 received from wireless communication device 1. In some aspects, the wireless communication device may also include the second part (SCI-2) of the sidelink control information of the two-part SCI associated with wireless communication device 1 in the SCI-1 of the wireless communication device.

[0083] In some aspects, the SCI-1 of wireless communication may support including resource reservation information for multiple sidelink transmissions. In these cases, the wireless communication device may include in the SCI-1 of the wireless communication device the resource reservation information associated with wireless communication device 1 and the resource reservation information associated with the wireless communication device. This allows the wireless communication device to reserve sidelink resources when forwarding, relaying, and / or otherwise sending the resource reservation information associated with the wireless communication device.

[0084] In some aspects, a wireless communication device may forward, relay, and / or otherwise send resource reservation information to one or more other wireless communication devices on the sidelink by sending the resource reservation information in the SCI-2 of the two-part SCI associated with the wireless communication device. In these cases, the wireless communication device may send the SCI-2 on the physical sidelink shared channel (PSSCH). In some aspects, the SCI-2 may include a new format for the SCI-2 that supports including resource reservation information in the SCI-2.

[0085] In some aspects, a wireless communication device may forward, relay, and / or otherwise send resource reservation information to one or more other wireless communication devices on a sidelink by piggybacking resource reservation on data communications sent on the PSSCH. In these cases, the resource reservation information may be included in medium access control control element (MAC-CE) communications on the PSSCH. In some aspects, a wireless communication device may forward, relay, and / or otherwise send resource reservation information to one or more other wireless communication devices in a MAC-CE on the PSSCH on the sidelink without an accompanying data transmission.

[0086] In some aspects, when a wireless communication device forwards, relays, and / or otherwise sends resource reservation information associated with another wireless communication device, the wireless communication device may include additional information along with the resource reservation information. For example, if wireless communication device 2 forwards, relays, and / or otherwise sends resource reservation information associated with wireless communication device 1 on the sidelink, wireless communication device 2 may also include a region identifier and / or other location information associated with wireless communication device 2, and / or one or more signal measurements (e.g., RSRP measurement, RSSI measurement, RSRQ measurement, CQI measurement, etc.) associated with wireless communication device 1 and performed by wireless communication device 2.

[0087] In some aspects, a wireless communication device may forward, relay, and / or otherwise send resource reservation information associated with multiple wireless communication devices in a single sidelink communication on the sidelink. For example, wireless communication device 2 may receive resource reservation information from wireless communication device 1 and wireless communication device 3 on the sidelink, and may forward, relay, and / or otherwise send on the sidelink the resource reservation information received from wireless communication device 1 and wireless communication device 3 on the sidelink in a single sidelink communication.

[0088] In some aspects, each wireless communication device (e.g., each of wireless communication devices 1 to n) may send the corresponding resource reservation on the sidelink to one or more other wireless communication devices on the sidelink in a similar manner as described above in connection with Figure 3A and 3B . Additionally, in connection with Figure 3A and 3B , each wireless communication device (e.g., each of wireless communication devices 1 to n) may receive resource reservation information on the sidelink from one or more other wireless communication devices, and may forward, relay, and / or otherwise send the received reservation information to one or more other wireless communication devices on the sidelink.

[0089] In this way, if the first wireless communication device fails to receive the resource reservation information directly from the second wireless communication device (e.g., due to interference, due to the first wireless communication device transmitting when the resource reservation information is to be received, etc.), the first wireless communication device can receive the resource reservation information from the third wireless communication device. This reduces and / or eliminates the possibility that the first wireless communication device will attempt to reserve sidelink resources that have already been reserved for the second wireless communication device, which reduces and / or eliminates conflicts on the sidelink, reduces the likelihood that sidelink communications will be dropped, and reduces security issues in various V2X security applications.

[0090] As noted above, Figure 3A and 3B are provided as one or more examples. Other examples may be different from those described with respect to Figure 3A and 3B described.

[0091] Figure 4 is a diagram illustrating an example process 400, such as may be performed by a first wireless communication device, in accordance with various aspects of the present disclosure. Example process 400 is an example in which a first wireless communication device (e.g., UE 120 shown and described above in connection with Figure 1 and 2, RSU 140 shown and described above in connection with Figure 1 and 2, a wireless communication device shown and described above in connection with Figure 3A and 3B etc.) performs operations associated with relaying resource reservation information on a sidelink.

[0092] As Figure 4 shown, in some aspects, process 400 may include: receiving, on a sidelink, resource reservation information associated with a second wireless communication device, where the resource reservation information identifies sidelink resources reserved for the second wireless communication device for transmission on the sidelink (block 410). For example, the first wireless communication device (e.g., using antenna 252, antenna 286, DEMOD 254, DEMOD 287, MIMO detector 256, MIMO detector 288, receive processor 258, receive processor 289, controller / processor 280, controller / processor 294, memory 282, memory 295, etc.) may receive, on the sidelink, resource reservation information associated with the second wireless communication device, as described above. In some aspects, the resource reservation information identifies sidelink resources reserved for the second wireless communication device for transmission on the sidelink.

[0093] As Figure 4As further shown in, in some aspects, process 400 may include: sending resource reservation information to a third wireless communication device on a sidelink (block 420). For example, a first wireless communication device (e.g., using antenna 252, antenna 286, MOD 254, MOD 287, TX MIMO processor 266, MIMO processor 291, transmit processor 264, transmit processor 292, controller / processor 280, controller / processor 294, memory 282, memory 295, etc.) may send resource reservation information to a third wireless communication device on a sidelink as described above.

[0094] Process 400 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere in this document.

[0095] In a first aspect, sending the resource reservation information to the third wireless communication device includes: sending the resource reservation information together with other resource reservation information associated with the first wireless communication device. In a second aspect, either alone or in combination with the first aspect, sending the resource reservation information to the third wireless communication device includes: sending the resource reservation information in a second part of a two-part sidelink control information communication on a physical sidelink shared channel.

[0096] In a third aspect, either alone or in combination with one or more of the first and second aspects, sending the resource reservation information to the third wireless communication device includes: sending the resource reservation information in a media access control control element communication together with other shared data on a physical sidelink shared channel. In a fourth aspect, either alone or in combination with one or more of the first through third aspects, sending the resource reservation information to the third wireless communication device includes: sending the resource reservation information in a media access control control element communication on a physical sidelink shared channel without other shared channel data.

[0097] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, sending the resource reservation information to the third wireless communication device includes: sending the resource reservation information in a first part of two-part sidelink control information communication on a physical sidelink control channel. In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, the resource reservation information includes at least one of the following: an indication of one or more frequency domain resources for transmission by the second wireless communication device on the sidelink, an indication of one or more time domain resources for transmission by the second wireless communication device on the sidelink, a source identifier associated with the second wireless communication device, a destination identifier associated with a destination wireless communication device for one or more sidelink communications to be sent by the second wireless communication device on the sidelink, a hybrid automatic repeat request identifier for the one or more sidelink communications, a region identifier associated with the second wireless communication device, a region identifier associated with the first wireless communication device, or a reference signal received power measurement generated by the first wireless communication device and used for the second wireless communication device.

[0098] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, process 400 includes: receiving, on the sidelink, other resource reservation information associated with one or more fourth wireless communication devices; and sending the resource reservation information to the third wireless communication device includes: sending the resource reservation information together with the other resource reservation information to the third wireless communication device. In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, sending the resource reservation information to the third wireless communication device includes: sending the resource reservation information to the third wireless communication device and one or more fourth wireless communication devices.

[0099] In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, the sidelink resources are autonomously reserved by the second wireless communication device. In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, the sidelink resources are allocated by a base station to the second wireless communication device. In an eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, each of the first wireless communication device, the second wireless communication device, and the third wireless communication device is a user equipment or a roadside unit.

[0100] Although Figure 4illustrates example blocks of process 400, but in some aspects, process 400 may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner compared to those depicted in Figure 4 In addition or alternatively, two or more of the blocks of process 400 may be executed in parallel.

[0101] Figure 5 is a conceptual data flow diagram 500 showing the data flow between different components in an example device 502. The device 502 may be a UE (e.g., UE 120 shown and described above in connection with Figure 1 and 2), an RSU (e.g., RSU 140 shown and described above in connection with Figure 1 and 2), a wireless communication device (e.g., the wireless communication device shown and described above in connection with Figure 3A and 3B shown and described), etc. In some aspects, the device 502 includes a receiving component 504 and a transmitting component 506.

[0102] In some aspects, the receiving component 504 may receive resource reservation information 508 associated with another device 550 (e.g., UE 120, RSU 140, wireless communication device, etc.) on a sidelink. In some aspects, the resource reservation information 508 identifies sidelink resources reserved for the device 550 for transmission on the sidelink. In some aspects, the transmitting component 506 may transmit the resource reservation information 508 to another device 560 (e.g., UE 120, RSU 140, wireless communication device, etc.) on the sidelink.

[0103] In some aspects, the receiving component 504 may include an antenna (e.g., antenna 252, antenna 286, etc.), a DEMOD (e.g., DEMOD 254, DEMOD 287, etc.), a MIMO detector (e.g., MIMO detector 256, MIMO detector 288, etc.), a receiving processor (e.g., receiving processor 258, receiving processor 289, etc.), a controller / processor (e.g., controller / processor 280, controller / processor 294, etc.), a memory (e.g., memory 282, memory 295, etc.), etc. In some aspects, the transmitting component 506 may include an antenna (e.g., antenna 252, antenna 286, etc.), a MOD (e.g., MOD 254, MOD 287, etc.), a MIMO processor (e.g., TX MIMO processor 266, MIMO processor 291, etc.), a transmitting processor (e.g., transmitting processor 264, transmitting processor 292, etc.), a controller / processor (e.g., controller / processor 280, controller / processor 294, etc.), a memory (e.g., memory 282, memory 295, etc.), etc.

[0104] Apparatus 502 may include additional components that perform each of the blocks of the algorithms in processes 400 etc. described above. Each of the blocks in processes 400 etc. described above may be performed by components, and the apparatus may include one or more of those components. The components may be one or more hardware components specifically configured to perform the process / algorithm, implemented by a processor configured to perform the process / algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof. Figure 4 The number and arrangement of components shown in Figure 4 are provided as an example. In practice, there may be additional components, fewer components, different components, or components arranged in a different manner compared to those shown in

[0105] In Figure 5 In addition, two or more components shown in Figure 5 may be implemented within a single component, or a single component shown in Figure 5 may be implemented as multiple distributed components. Additionally or alternatively, a set of components (e.g., one or more components) shown in Figure 5 may perform one or more functions described as being performed by another set of components shown in Figure 5 The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit aspects to the precise forms disclosed. Modifications and variations may be made in accordance with the above disclosure, or may be obtained from practice of the aspects. Figure 5 The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit aspects to the precise forms disclosed. Modifications and variations may be made in accordance with the above disclosure, or may be obtained from practice of the aspects.

[0106] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, and / or a combination of hardware and software. As used herein, a "processor" is implemented with hardware, firmware, and / or a combination of hardware and software.

[0107] As used herein, depending on the context, meeting a threshold may refer to a value greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, etc.

[0108] It will be apparent that the systems and / or methods described herein may be implemented in different forms of hardware, firmware, and / or combinations of hardware and software. The actual specific control hardware or software code used to implement these systems and / or methods is not limiting of the aspects. Accordingly, the operations and behavior of the systems and / or methods are described herein without reference to specific software code, understanding that software and hardware can be designed to implement the systems and / or methods at least in part based on the description herein.

[0109] It will be apparent that the systems and / or methods described herein may be implemented in different forms of hardware, firmware, and / or combinations of hardware and software. The actual specific control hardware or software code used to implement these systems and / or methods is not limiting of the aspects. Accordingly, the operations and behavior of the systems and / or methods are described herein without reference to specific software code, understanding that software and hardware can be designed to implement the systems and / or methods at least in part based on the description herein.

[0110] Even if a particular combination of features is recited in the claims and / or disclosed in the specification, such combinations are not intended to limit the disclosure of the various aspects. In fact, many of these features may be combined in ways not specifically recited in the claims and / or specifically disclosed in the specification. Although each dependent claim listed below may depend directly on only one claim, the disclosure of the various aspects includes the combination of each dependent claim with every other claim in the set of claims. The phrase referring to a list of items “at least one of” refers to any combination of those items, including a single member. For example, “at least one of a, b, or c” is intended to cover a, b, c, a - b, a - c, b - c, and a - b - c, as well as any combination with multiples of the same element (e.g., a - a, a - a - a, a - a - b, a - a - c, a - b - b, a - c - c, b - b, b - b - b, b - b - c, c - c, and c - c - c or any other ordering of a, b, and c).

[0111] None of the elements, acts, or instructions used herein should be construed as critical or essential unless explicitly described as such. Additionally, as used herein, the articles “a” and “an” are intended to include one or more items and may be used interchangeably with “one or more.” Further, as used herein, the terms “set” and “group” are intended to include one or more items (e.g., combinations of related items, unrelated items, related and unrelated items, etc.) and may be used interchangeably with “one or more.” The phrase “only one” or similar language is used where only one item is intended. Additionally, as used herein, the terms “has,” “have,” “having,” and / or similar terms are intended to be open - ended terms. Further, unless otherwise explicitly stated, the phrase “based on” is intended to mean “at least partially based on.”

Claims

1. A method of wireless communication performed by a first wireless communication device, comprising: Receiving first sidelink control information (SCI) from a second wireless communication device, wherein the first SCI identifies sidelink resources reserved for the second wireless communication device, and Sending second SCI to a third wireless communication device, wherein the second SCI is at least partially based on the first SCI.

2. The method according to claim 1, wherein The second SCI identifies the sidelink resources.

3. The method according to claim 1, wherein The second SCI is included in the first SCI.

4. The method according to claim 1, wherein The first SCI is the first part of a two-part SCI, and the second SCI is the second part of the two-part SCI.

5. The method according to claim 1, wherein, Receiving the first SCI comprises: Receiving the first SCI on a physical sidelink control channel (PSCCH).

6. The method according to claim 1, wherein Sending the second SCI comprises: Sending the second SCI on a physical sidelink shared channel (PSSCH).

7. The method according to claim 1, wherein, The first SCI includes an indication of at least one of: One or more frequency domain resources, or, One or more time domain resources.

8. The method according to claim 1, further comprising: Sending resource reservation information identified in the first SCI to a fourth wireless communication device.

9. A first wireless communication device for wireless communication, comprising: One or more memories; And One or more processors coupled to the one or more memories, configured to: Receive first sidelink control information (SCI) from a second wireless communication device, wherein the first SCI identifies sidelink resources reserved for the second wireless communication device, and Send second SCI to a third wireless communication device, wherein the second SCI is at least partially based on the first SCI.

10. The first wireless communication device according to claim 9, wherein, The second SCI identifies the sidelink resources.

11. The first wireless communication device according to claim 9, wherein, The second SCI is included in the first SCI.

12. The first wireless communication device according to claim 9, wherein, The first SCI is the first part of a two-part SCI, and the second SCI is the second part of the two-part SCI.

13. The first wireless communication device according to claim 9, wherein, To receive the first SCI, the one or more processors are configured to: Receive the first SCI on a physical sidelink control channel (PSCCH).

14. The first wireless communication device according to claim 9, wherein, To send the second SCI, the one or more processors are configured to: Send the second SCI on a physical sidelink shared channel (PSSCH).

15. The first wireless communication device according to claim 9, wherein, The first SCI includes an indication of at least one of: One or more frequency domain resources, or, One or more time domain resources.

16. The first wireless communication device according to claim 9, wherein, The one or more processors are further configured to: Send resource reservation information identified in the first SCI to a fourth wireless communication device.

17. A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising: One or more instructions that, when executed by one or more processors of a first wireless communication device, cause the first wireless communication device to perform the following operations: Receive first sidelink control information (SCI) from a second wireless communication device, where the first SCI identifies sidelink resources reserved for the second wireless communication device, and Transmit second SCI to a third wireless communication device, where the second SCI is at least partially based on the first SCI.

18. The non-transitory computer-readable medium according to claim 17, wherein, The second SCI identifies the sidelink resources.

19. The non-transitory computer-readable medium according to claim 17, wherein, The second SCI is included in the first SCI.

20. The non-transitory computer-readable medium according to claim 17, wherein, The first SCI is the first part of a two-part SCI, and the second SCI is the second part of the two-part SCI.

21. The non-transitory computer-readable medium according to claim 17, wherein, The one or more instructions that cause the first wireless communication device to receive the first SCI cause the first wireless communication device to perform the following operations: Receive the first SCI on a physical sidelink control channel (PSCCH).

22. The non-transitory computer-readable medium according to claim 17, wherein, The one or more instructions that cause the first wireless communication device to transmit the second SCI cause the first wireless communication device to perform the following operations: Transmit the second SCI on a physical sidelink shared channel (PSSCH).

23. The non-transitory computer-readable medium according to claim 17, wherein, The first SCI includes an indication of at least one of the following: One or more frequency domain resources, or One or more time domain resources.

24. The non-transitory computer-readable medium according to claim 17, wherein, The one or more instructions further cause the first wireless communication device to perform the following operations: Transmit resource reservation information identified in the first SCI to a fourth wireless communication device.

25. A first apparatus for wireless communication, comprising: A unit for receiving first sidelink control information (SCI) from a second apparatus, where the first SCI identifies sidelink resources reserved for the second apparatus; and A unit for transmitting second SCI to a third apparatus, where the second SCI is at least partially based on the first SCI.

26. The first device according to claim 25, wherein, The second SCI identifies the sidelink resources.

27. The first device according to claim 25, wherein, The second SCI is included in the first SCI.

28. The first device according to claim 25, wherein, The first SCI is the first part of a two-part SCI, and the second SCI is the second part of the two-part SCI.

29. The first device according to claim 25, wherein The unit for receiving the first SCI comprises: A unit for receiving the first SCI on a physical sidelink control channel (PSCCH).

30. The first device according to claim 25, wherein, The unit for transmitting the second SCI comprises: A unit for transmitting the second SCI on a physical sidelink shared channel (PSSCH).

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