Recipient feedback on potential conflicts

Abstract

A receiving device identifies a conflict between a first resource reserved by a first transmitting device and a second resource reserved by a second transmitting device; and transmits a conflict indication to the first transmitting device or the second transmitting device based on the identified conflict. A transmitting device receives the conflict indication from the receiving device; and in response to receiving the conflict indication from the receiving device, backs off from transmitting during the resource reserved by the resource reservation.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of U.S. Provisional Application No. 62 / 912,003, filed on October 7, 2019, entitled “RECEIVER FEEDBACK ABOUT POTENTIAL COLLISIONS,” and U.S. Patent Application No. 17 / 027,645, filed on September 21, 2020, entitled “RECEIVER FEEDBACK ABOUT POTENTIAL COLLISIONS,” both of which are expressly incorporated herein by reference in their entirety. background Technical Field

[0004] The present disclosure relates generally to communication systems and, more particularly, to user equipment configured to communicate information indicating potential conflicts over a set of resources.

[0005] introduction

[0006] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcast. Typical wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.

[0007] These multiple access technologies have been adopted in various telecommunication standards to provide common protocols that enable different wireless devices to communicate at city, country, region, and even global levels. An example telecommunication standard is 5G New Radio (NR). 5G NR is a part of the continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with the Internet of Things (IoT)) and other requirements. 5GNR includes services associated with enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable low latency communication (URLLC). Some aspects of 5G NR can be based on 4G Long Term Evolution (LTE) standards. There is a need for further improvements to 5G NR technology. These improvements may also be applicable to other multiple access technologies and telecommunication standards that employ these technologies.

[0008] For example, some aspects of wireless communication include direct communication between devices, such as device-to-device (D2D), vehicle-to-everything (V2X), etc. There is a need for further improvements in such direct communication between devices. Improvements related to direct communication between devices may be applicable to other multiple access technologies and telecommunication standards that employ these technologies.

[0009] Overview

[0010] A brief summary of one or more aspects is given below to provide a basic understanding of such aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be presented later.

[0011] In some wireless communication environments, a transmitting device (such as a user equipment (UE)) and a receiving device (such as another UE) can communicate using multiple packets transmitted over the air. The transmitting device can transmit each packet multiple times in order to reserve a set of resources. For example, the transmitting device can transmit a transmission that reserves resources for a first transmission, the first transmission of a packet can reserve resources for the next transmission of the packet, and so on.

[0012] When other devices (such as other UEs) receive transmissions of the reserved resources, these other devices may refrain from transmitting on the reserved resources. For example, other UEs may back off or delay transmitting on the resources for the duration of the reservation. By refraining from transmitting on the reserved resources, interference experienced by the receiving device may be reduced.

[0013] In some aspects, if the intended recipient does not correctly receive the packet, the transmitting device may retransmit the packet. For example, if the intended recipient responds with a negative acknowledgement (NACK), the transmitting device may determine that the packet is to be retransmitted. However, if the transmitting device does not receive a NACK from any intended recipient, the transmitting device may determine that retransmission of the packet is not necessary and may refrain from retransmitting the packet.

[0014] Potentially, other devices that avoid transmitting on the resources reserved by the transmitting device may also monitor for NACKs from the intended recipient of the transmitting device. If one of these other devices detects a NACK from the intended recipient of the transmitting device, the one of these other devices may avoid using the resources reserved for retransmissions. However, if a NACK from the intended recipient of the transmitting device is not detected, the one of these other devices may determine that the reserved resources will not be used by the transmitting device for retransmissions, and thus the one of these other devices may use the reserved resources to transmit communications.

[0015] In some scenarios, the reservation of resources may not completely avoid conflicts between transmissions. For example, two devices may reserve resources at the same time. One or both of the two devices may be unaware of the other reservation and may transmit in an overlapping manner that interferes with the transmission of the other device. For example, one transmitting device may be a hidden node to the other device and may thus be an interfering device. When the other transmitting device transmits the reservation, the interfering device may be outside the link budget range for the control transmission of the other transmitting device, but the interfering device may still transmit using power sufficient to interrupt reception at the intended recipient.

[0016] The present disclosure describes techniques and methods for reducing the amount of interfering transmissions and / or mitigating the effects of interfering transmissions based on identifying overlap reservations between two transmitting devices. The various aspects described herein enable a receiving device to determine which of two or more potentially conflicting transmissions should be performed (and by extension, which of two or more potentially conflicting transmissions should be backed off). In some aspects, if multiple receiving devices are affected by a potential conflict, each of these receiving devices can identify the same transmitting device that should be notified of the conflict, such as by applying a global rule.

[0017] In a first aspect of the present disclosure, a first method, a first computer-readable medium, and a first device are provided. The first device may be a receiving device. The first device may identify a conflict between a first resource reserved by a first transmitting device and a second resource reserved by a second transmitting device. The first device may then transmit a conflict indication to the first transmitting device or the second transmitting device based on the identified conflict.

[0018] In a second aspect of the present disclosure, a second method, a second computer-readable medium, and a second device are provided. The second device may be a transmitting device. The second device may transmit a resource reservation for transmission from the transmitting device to at least one receiving device. The second device may receive a conflict indication from a receiving device of the at least one receiving device regarding a conflict between resources reserved by the resource reservation and resources reserved by another transmitting device. The transmitting device may then back off from transmitting on the resources reserved by the resource reservation in response to receiving the conflict indication from the receiving device.

[0019] To achieve the foregoing and related ends, the one or more aspects include the features fully described below and particularly pointed out in the claims. The following description and drawings set forth in detail certain illustrative features of the one or more aspects. However, these features are merely indicative of several of the various ways in which the principles of the various aspects may be employed, and this description is intended to cover all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a diagram illustrating an example of a system and an access network.

[0022] Figure 2A is a diagram illustrating an example of a first frame according to various aspects of the present disclosure.

[0023] Figure 2B is a diagram illustrating an example of DL channels within a subframe according to various aspects of the present disclosure.

[0024] Figure 2C is a diagram illustrating an example of a second frame according to various aspects of the present disclosure.

[0025] Figure 2D is a diagram illustrating an example of UL channels within a subframe according to various aspects of the present disclosure.

[0026] Figure 3 is a diagram illustrating an example of a base station and a user equipment (UE) in an access network.

[0027] Figure 4 is a diagram illustrating an example of devices involved in wireless communications.

[0028] Figure 5 is a diagram illustrating an example of devices involved in wireless communications including line-of-sight conditions and non-line-of-sight conditions.

[0029] Figure 6 is a graph showing example path loss over distance for vehicle-to-everything (V2X) communications.

[0030] Figure 7is a call flow diagram illustrating an example communication flow between devices.

[0031] Figure 8 is a flow chart of a method for wireless communication by a receiving device.

[0032] Fig. 9 The present invention is a flow chart of a method for wireless communication by a transmitting device.

[0033] Fig.10 is a diagram illustrating an example of a hardware implementation for an example device.

[0034] Fig.11 is a diagram illustrating another example of a hardware implementation for another example device.

[0035] Detailed Description

[0036] The detailed description set forth below in conjunction with the accompanying drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. This detailed description includes specific details to provide a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid diluting such concepts.

[0037] Several aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0038] As an example, an element, or any part of an element, or any combination of elements may be implemented as a "processing system" including one or more processors. Examples of processors include: microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on chip (SoCs), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gating logic, discrete hardware circuits, and other suitable hardware configured to perform various functionalities described throughout this disclosure. One or more processors in a processing system may execute software. Software should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether it is described in software, firmware, middleware, microcode, hardware description languages, or other terms.

[0039] Accordingly, in one or more example embodiments, the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, each function may be stored or encoded on a computer-readable medium as one or more instructions or codes. Computer-readable media include computer storage media. Storage media may be any available medium that can be accessed by a computer. As an example and not limitation, such computer-readable media may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, a combination of computer-readable media of the above types, or any other medium that can be used to store computer-executable code in the form of instructions or data structures that can be accessed by a computer.

[0040] Figure 1 1 is a diagram illustrating an example of a wireless communication system and access network 100. The wireless communication system (also referred to as a wireless wide area network (WWAN)) includes a base station 102, a user equipment (UE) 104, an evolved packet core (EPC) 160, and another core network 190 (e.g., a 5G core (5GC)). The base station 102 may include a macro cell (a high-power cellular base station) and / or a small cell (a low-power cellular base station). A macro cell includes a base station. A small cell includes a femto cell, a pico cell, and a micro cell.

[0041] The base station 102 configured for 4G Long Term Evolution (LTE), collectively referred to as the Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN), can interface with the EPC 160 via a first backhaul link 132 (e.g., an S1 interface). The base station 102 configured for 5G New Radio (NR), collectively referred to as the Next Generation RAN (NG-RAN), can interface with the core network 190 via a second backhaul link 184. The base station 102 can also perform one or more of the following functions, among other functions: delivery of user data, radio channel encryption and decryption, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distribution of non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment tracking, RAN information management (RIM), paging, positioning, and delivery of alert messages. The base stations 102 may communicate with each other directly or indirectly (eg, through the EPC 160 or the core network 190) over a third backhaul link 134 (eg, an X2 interface). The first backhaul link 132, the second backhaul link 184, and the third backhaul link 134 may be wired or wireless.

[0042] Base stations 102 may communicate wirelessly with UEs 104. Each base station 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, a small cell 102' may have a coverage area 110' that overlaps with the coverage area 110 of one or more macro base stations 102. A network that includes both small cells and macro cells may be referred to as a heterogeneous network. A heterogeneous network may also include a home evolved Node B (eNB) (HeNB), which may provide services to a restricted group called a closed subscriber group (CSG). A communication link 120 between a base station 102 and a UE 104 may include an uplink (UL) (also known as a reverse link) transmission from the UE 104 to the base station 102 and / or a downlink (DL) (also known as a forward link) transmission from the base station 102 to the UE 104. The communication link 120 may use multiple-input multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity. These communication links may be over one or more carriers. The base station 102 / UE 104 may use spectrum of up to Y megahertz (MHz) (e.g., 5, 10, 15, 20, 100, 400 MHz, etc.) bandwidth for each carrier allocated in a carrier aggregation for a total of up to Yx MHz (x component carriers) for transmission in each direction. The carriers may or may not be adjacent to each other. The allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated to DL compared to UL). The component carriers may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell), and the secondary component carrier may be referred to as a secondary cell (SCell).

[0043] Some UEs 104 may communicate with each other using a device-to-device (D2D) communication link 158. The D2D communication link 158 may use DL / UL WWAN spectrum. The D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). The D2D communication may be through a variety of wireless D2D communication systems, such as, for example, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.

[0044] The wireless communication system may further include a Wi-Fi access point (AP) 150 in communication with a Wi-Fi station (STA) 152 via a communication link 154, such as in a 5 gigahertz (GHz) unlicensed spectrum. When communicating in the unlicensed spectrum, the STA 152 / AP 150 may perform a clear channel assessment (CCA) to determine whether the channel is available prior to communication.

[0045] The small cell 102' may operate in a licensed and / or unlicensed spectrum. When operating in an unlicensed spectrum, the small cell 102' may employ NR and use the same unlicensed spectrum (e.g., 5 GHz, etc.) as used by the Wi-Fi AP 150. The small cell 102' employing NR in the unlicensed spectrum may boost the coverage of the access network and / or increase the capacity of the access network.

[0046] The electromagnetic spectrum is typically subdivided into various classes, bands, channels, etc. based on frequency / wavelength. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz–7.125 GHz) and FR2 (24.25 GHz–52.6 GHz). Frequencies between FR1 and FR2 are typically referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is typically (interchangeably) referred to as the “sub-6 GHz band” in various documents and articles. Similar naming issues sometimes arise regarding FR2, which is typically (interchangeably) referred to as the “millimeter wave” band in various documents and articles, although it is different from the extremely high frequency (EHF) band (30 GHz–300 GHz) identified as the “millimeter wave” band by the International Telecommunication Union (ITU).

[0047] In view of the above aspects, unless otherwise specifically stated, it should be understood that if used in this article, the term "sub-6 GHz" and the like can broadly represent frequencies that can be less than 6 GHz, can be within FR1, or can include mid-band frequencies. In addition, unless otherwise specifically stated, it should be understood that if used in this article, the term "millimeter wave" and the like can broadly represent frequencies that can include mid-band frequencies, can be within FR2, or can be within the EHF band.

[0048] Whether a small cell 102' or a large cell (e.g., a macro base station), the base station 102 may include and / or be referred to as an eNB, a gB node (gNB), or another type of base station. Some base stations (such as gNB 180) may operate in the traditional sub-6 GHz spectrum, in millimeter wave frequencies, and / or near millimeter wave frequencies to communicate with UE 104. When gNB 180 operates in millimeter wave frequencies or near millimeter wave frequencies, gNB 180 may be referred to as a millimeter wave base station. Millimeter wave base station 180 may utilize beamforming 182 with UE 104 to compensate for path loss and short range. Base station 180 and UE 104 may each include multiple antennas, such as antenna elements, antenna panels, and / or antenna arrays to facilitate beamforming.

[0049] Base station 180 may transmit beamformed signals to UE 104 in one or more transmit directions 182'. UE 104 may receive beamformed signals from base station 180 in one or more receive directions 182". UE 104 may also transmit beamformed signals to base station 180 in one or more transmit directions. Base station 180 may receive beamformed signals from UE 104 in one or more receive directions. Base station 180 / UE 104 may perform beam training to determine the best receive direction and transmit direction for each of base station 180 / UE 104. The transmit direction and receive direction of base station 180 may be the same or may be different. The transmit direction and receive direction of UE 104 may be the same or may be different.

[0050] The EPC 160 may include a mobility management entity (MME) 162, other MMEs 164, a serving gateway 166, a multimedia broadcast multicast service (MBMS) gateway 168, a broadcast multicast service center (BM-SC) 170, and a packet data network (PDN) gateway 172. The MME 162 may be in communication with a home subscriber server (HSS) 174. The MME 162 is a control node that handles signaling between the UE 104 and the EPC 160. In general, the MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are delivered through the serving gateway 166, which itself is connected to the PDN gateway 172. The PDN gateway 172 provides UE IP address allocation and other functions. The PDN gateway 172 and the BM-SC 170 are connected to IP services 176. The IP services 176 may include the Internet, an intranet, an IP multimedia subsystem (IMS), a PS streaming service, and / or other IP services. The BM-SC 170 may provide functionality for MBMS user service provisioning and delivery. The BM-SC 170 may serve as an entry point for content provider MBMS transmissions, may be used to authorize and initiate MBMS bearer services within a public land mobile network (PLMN), and may be used to schedule MBMS transmissions. The MBMS gateway 168 may be used to distribute MBMS traffic to base stations 102 belonging to a multicast broadcast single frequency network (MBSFN) area that broadcasts a specific service, and may be responsible for session management (start / stop) and for collecting eMBMS-related charging information.

[0051] The core network 190 may include an access and mobility management function (AMF) 192, other AMFs 193, a session management function (SMF) 194, and a user plane function (UPF) 195. The AMF 192 may be in communication with a unified data management (UDM) 196. The AMF 192 is a control node that processes signaling between the UE 104 and the core network 190. In general, the AMF 192 provides quality of service (QoS) flows and session management. All user Internet Protocol (IP) packets are delivered through the UPF 195. The UPF 195 provides UE IP address allocation and other functions. The UPF 195 is connected to an IP service 197. The IP service 197 may include the Internet, an intranet, an IP multimedia subsystem (IMS), a packet switching (PS) streaming (PSS) service, and / or other IP services.

[0052] A base station may include and / or be referred to as a gNB, a Node B, an eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transmission reception point (TRP), or some other suitable term. The base station 102 provides an access point to the EPC 160 or the core network 190 for the UE 104. Examples of UE 104 include a cellular phone, a smart phone, a Session Initiation Protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., an MP3 player), a camera, a game console, a tablet device, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a health care device, an implant, a sensor / actuator, a display, or any other similar functional device. Some UEs 104 may be referred to as IoT devices (e.g., parking meters, gas pumps, ovens, vehicles, heart monitors, etc.). UE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.

[0053] Although the present disclosure may focus on 5G NR, the concepts and aspects described herein may be applicable to other similar areas such as LTE, Advanced LTE (LTE-A), Code Division Multiple Access (CDMA), Global System for Mobile Communications (GSM), or other wireless / radio access technologies.

[0054] Further, although the present disclosure may focus on vehicle-to-vehicle (V2V) communications, the concepts and aspects described herein may be applicable to other similar areas, such as D2D communications, IoT communications, vehicle-to-everything (V2X) communications, or other standards / protocols for communications in wireless / access networks.

[0055] Some wireless communication networks may include vehicle-based communication devices that may communicate and / or communicate with other devices based on V2V, vehicle-to-infrastructure (V2I) (e.g., from a vehicle-based communication device to a road infrastructure node, such as a roadside unit (RSU)), vehicle-to-network (V2N) (e.g., from a vehicle-based communication device to one or more network nodes, such as a base station), and / or a combination thereof, which communications may be collectively referred to as vehicle-to-everything (V2X) communications. Again, referring to Figure 1In certain aspects, a UE 104 (e.g., a transmitting vehicle user equipment (VUE) or other UE) may be configured to transmit a message directly to another UE 104. The communication may be based on V2V / V2X / V2I or other D2D communications, such as proximity services (ProSe), etc. Communications based on V2V, V2X, V2I, and / or other D2D may also be transmitted and received by other transmitting and receiving devices (such as RSU 107, etc.). Aspects of the communication may be based on PC5 or sidelink communications, for example, as described in conjunction with the example in FIG. 2 .

[0056] Refer again Figure 1 In certain aspects, a receiving device (such as a UE 104 and / or an RSU 107) may include a conflict feedback component 198 configured to identify a conflict between a first resource reserved by a first transmitting device (e.g., a UE 104') and a second resource reserved by a second transmitting device (e.g., a UE 104"). The conflict feedback component 198 of the receiving device (e.g., a UE 104 and / or an RSU 107) may then transmit a conflict indication to the first transmitting device (e.g., a UE 104') or the second transmitting device (e.g., a UE 104") based on the identified conflict.

[0057] In certain other aspects, a transmitting device (e.g., UE 104' and / or RSU 107) may transmit a resource reservation for transmission from the transmitting device to at least one receiving device (e.g., UE 104 and / or RSU 107). The transmitting device may include a backoff component 199 configured to receive a conflict indication from one of the at least one receiving devices. In response to receiving the conflict indication, the backoff component 199 may configure the transmitting device to back off from transmitting during the resources reserved by the resource reservation. Although only UE 104 and RSU 107 are illustrated as having a conflict feedback component 198, and only UE 104' and RSU 107 are illustrated as having a backoff component 199, any UE (and / or any device configured for D2D communication) may include one or more components similar to the conflict feedback component 198 and / or the backoff component 199.

[0058] Figure 2A 200 is a diagram illustrating an example of a first subframe within a 5G NR frame structure. Figure 2B is a diagram 230 illustrating an example of DL channels within a 5G NR subframe. Figure 2C 250 is a diagram illustrating an example of a second subframe within a 5G NR frame structure. Figure 2D280 is a diagram illustrating an example of UL channels within a 5G NR subframe. The 5G NR frame structure can be frequency division duplex (FDD), where for a particular set of subcarriers (carrier system bandwidth), subframes within the subcarrier set are dedicated to DL or UL; or can be time division duplex (TDD), where for a particular set of subcarriers (carrier system bandwidth), subframes within the subcarrier set are dedicated to both DL and UL. Figure 2A , 2C In the example provided, the 5G NR frame structure is assumed to be TDD, where subframe 4 is configured with slot format 28 (mostly DL) and subframe 3 is configured with slot format 34 (mostly UL), where D is DL, U is UL, and F is for flexible use between DL / UL. Although subframes 3 and 4 are shown as having slot formats 34 and 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0 and 1 are full DL and full UL, respectively. Other slot formats 2-61 include a mixture of DL, UL, and flexible symbols. The UE is configured with a slot format (dynamically configured by DL control information (DCI) or semi-statically / statically configured by radio resource control (RRC) signaling) through the received slot format indicator (SFI). Note that the following description also applies to the 5G NR frame structure for TDD.

[0059] Other wireless communication technologies may have different frame structures and / or different channels. A frame (e.g., a 10 millisecond (ms) frame) may be divided into 10 equally sized subframes (1 ms). Each subframe may include one or more time slots. A subframe may also include a mini-time slot, which may include 7, 4, or 2 symbols. Each time slot may include 7 or 14 symbols, depending on the time slot configuration. For time slot configuration 0, each time slot may include 14 symbols, and for time slot configuration 1, each time slot may include 7 symbols. The symbols on the DL may be cyclic prefix (CP) orthogonal frequency division multiplexing (OFDM) (CP-OFDM) symbols. The symbols on the UL may be CP-OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also known as single carrier frequency division multiple access (SC-FDMA) symbols) (for power-limited scenarios; limited to single stream transmission). The number of time slots within a subframe is based on the time slot configuration and parameter design. For slot configuration 0, different parameter designs μ0 to 4 allow 1, 2, 4, 8, and 16 slots per subframe, respectively. For slot configuration 1, different parameter designs 0 to 2 allow 2, 4, and 8 slots per subframe, respectively. Accordingly, for slot configuration 0 and parameter design μ, there are 14 symbols per slot and 2 per subframe. μ time slots. The subcarrier spacing and symbol length / duration vary depending on parameter design. The subcarrier spacing can be equal to 2 μ*15 kilohertz (kHz), where μ is parameter design 0 to 4. Thus, parameter design μ=0 has a subcarrier spacing of 15 kHz, while parameter design μ=4 has a subcarrier spacing of 240 kHz. The symbol length / duration is inversely related to the subcarrier spacing. Figures 2A-2D An example of a slot configuration 0 with 14 symbols per slot and a parameter design μ=2 with 4 slots per subframe is provided. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is about 16.67 μs. Within a frame set, there may be one or more different bandwidth parts (BWPs) that are frequency division multiplexed (see Figure 2B ). Each BWP may have a specific parameter design.

[0060] A resource grid may be used to represent the frame structure. Each slot includes a resource block (RB) (also called a physical RB (PRB)) extending over 12 consecutive subcarriers. The resource grid is divided into a number of resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0061] like Figure 2A As explained in the illustration, some REs carry reference (pilot) signals (RS) for UEs. RSs may include demodulation RSs (DM-RSs) for channel estimation at the UE (indicated as R for a particular configuration). x , where 100x is the port number, but other DM-RS configurations are possible) and a channel state information reference signal (CSI-RS). RS may also include a beam measurement RS (BRS), a beam refinement RS (BRRS), and a phase tracking RS (PT-RS).

[0062] Figure 2BAn example of various DL channels within a subframe of a frame is illustrated. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs), each CCE including 9 RE groups (REGs), each REG including 4 consecutive REs in an OFDM symbol. The PDCCH within a BWP may be referred to as a control resource set (CORESET). Additional BWPs may be located at higher and / or lower frequencies across the channel bandwidth. The primary synchronization signal (PSS) may be within symbol 2 of a particular subframe of a frame. The PSS is used by the UE 104 to determine subframe / symbol timing and physical layer identity. The secondary synchronization signal (SSS) may be within symbol 4 of a particular subframe of a frame. The SSS is used by the UE to determine the physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE may determine the physical cell identifier (PCI). Based on the PCI, the UE may determine the location of the aforementioned DM-RS. The physical broadcast channel (PBCH) carrying the master information block (MIB) can be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block (also referred to as an SS block (SSB)). The MIB provides the number of RBs in the system bandwidth, and the system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted over the PBCH (such as the system information block (SIB)), and paging messages.

[0063] As in Figure 2C As explained in , some REs carry DM-RSs for channel estimation at the base station (indicated as R for one specific configuration, but other DM-RS configurations are possible). The UE may transmit DM-RSs for the physical uplink control channel (PUCCH) and DM-RSs for the physical uplink shared channel (PUSCH). The PUSCH DM-RS may be transmitted in the first or first two symbols of the PUSCH. The PUCCH DM-RS may be transmitted in different configurations depending on whether a short PUCCH or a long PUCCH is transmitted and on the specific PUCCH format used. The UE may transmit a sounding reference signal (SRS). The SRS may be transmitted in the last symbol of the subframe. The SRS may have a comb structure, and the UE may transmit the SRS on one of the comb teeth. The SRS may be used by the base station for channel quality estimation to enable frequency-dependent scheduling on the UL.

[0064] Figure 2DAn example of various UL channels within a subframe of an illustration frame. The PUCCH may be located at a location as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI), and hybrid automatic repeat request (HARQ) acknowledgement (ACK) / negative acknowledgement (NACK) feedback. The PUSCH carries data and may additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and / or UCI.

[0065] Figure 3 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network. In the DL, IP packets from the EPC 160 may be provided to a controller / processor 375. The controller / processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a media access control (MAC) layer. The controller / processor 375 provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIB), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter-radio access technology (RAT) mobility, and measurement configuration of UE measurement reports; PDCP layer functionality associated with header compression / decompression, security (ciphering, cipher decryption, integrity protection, integrity verification), and handover support functions; RLC layer functionality associated with delivery of upper layer packet data units (PDUs), error correction through ARQ, concatenation, segmentation and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0066] The transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1, including the physical (PHY) layer, may include error detection on the transport channel, forward error correction (FEC) encoding / decoding of the transport channel, interleaving, rate matching, mapping to the physical channel, modulation / demodulation of the physical channel, and MIMO antenna processing. The TX processor 316 handles the mapping to the signal constellation based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-phase shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time domain and / or frequency domain, and then combined together using an inverse fast Fourier transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially precoded to generate multiple spatial streams. Channel estimates from a channel estimator 374 may be used to determine coding and modulation schemes and for spatial processing. The channel estimates may be derived from reference signals and / or channel condition feedback transmitted by the UE 350. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318TX. Each transmitter 318TX may modulate an RF carrier with a corresponding spatial stream for transmission.

[0067] At the UE 350, each receiver 354RX receives a signal through its corresponding antenna 352. Each receiver 354RX recovers the information modulated onto the RF carrier and provides the information to a receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions. The RX processor 356 can perform spatial processing on the information to recover any spatial stream destined for the UE 350. If there are multiple spatial streams destined for the UE 350, they can be combined into a single OFDM symbol stream by the RX processor 356. The RX processor 356 then transforms the OFDM symbol stream from the time domain to the frequency domain using a fast Fourier transform (FFT). The frequency domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, as well as the reference signal, are recovered and demodulated by determining the signal constellation point most likely transmitted by the base station 310. These soft decisions can be based on the channel estimates calculated by the channel estimator 358. These soft decisions are then decoded and deinterleaved to recover the data and control signals originally transmitted on the physical channel by the base station 310. These data and control signals are then provided to the controller / processor 359 which implements layer 3 and layer 2 functionality.

[0068] The controller / processor 359 may be associated with a memory 360 that stores program codes and data. The memory 360 may be referred to as a computer readable medium. In the UL, the controller / processor 359 provides demultiplexing between transport channels and logical channels, packet reassembly, cipher interpretation, header decompression, and control signal processing to recover IP packets from the EPC 160. The controller / processor 359 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operations.

[0069] Similar to the functionality described in conjunction with DL transmissions performed by the base station 310, the controller / processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reporting; PDCP layer functionality associated with header compression / decompression, and security (encryption, decryption, integrity protection, integrity verification); RLC layer functionality associated with delivery of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, resegmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing MAC SDUs onto TBs, demultiplexing MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0070] Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by the base station 310 may be used by a TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antennas 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a corresponding spatial stream for transmission.

[0071] UL transmissions are processed at the base station 310 in a manner similar to that described in conjunction with the receiver functionality at the UE 350. Each receiver 318RX receives a signal through its respective antenna 320. Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to a RX processor 370.

[0072] The controller / processor 375 may be associated with a memory 376 that stores program codes and data. The memory 376 may be referred to as a computer readable medium. In the UL, the controller / processor 375 provides demultiplexing between transport channels and logical channels, packet reassembly, cipher decoding, header decompression, control signal processing to recover IP packets from the UE 350. The IP packets from the controller / processor 375 may be provided to the EPC 160. The controller / processor 375 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operations.

[0073] In some aspects, at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 may be configured to perform operations related to Figure 1 The 198 combined aspects.

[0074] According to some other aspects, at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 may be configured to perform operations related to Figure 1 The 199 combines all aspects.

[0075] Figure 4 An example 400 of wireless communication between devices based on V2X and / or other D2D communications is illustrated. The communication may be based on a time slot structure including the aspects described above in conjunction with FIG. 2 . For example, a transmitting UE 402 may transmit a transmission 414 including, for example, control information and / or data on a control channel and / or a corresponding data channel. The transmission 414 may be intended for (e.g., addressed to) a group of receiving UEs 404, 406, and 408. The control channel may include information for decoding the data channel and may also be used by the receiving device to avoid interference by refraining from transmitting on occupied resources during data transmission. The number of TTIs and RBs that the data transmission will occupy may be indicated in a control message from the transmitting device.

[0076] In addition to operating as a receiving device, UE 402, 404, 406, and 408 may each be capable of operating as a transmitting device. Thus, UE 406, 408 are illustrated as transmitting transmissions 416 and 420. Transmissions 414, 416, and 420 may be broadcast or multicast to nearby devices. For example, UE 404 may transmit communications intended to be received by other UEs within range 401 of UE 404. In some aspects, RSC 407 may receive communications from one or more of UE 402, 404, 406, and 408 and / or transmit communications to one or more of UE 402, 404, 406, and 408.

[0077] A transmitting device (such as UE 402) may transmit each packet multiple times. For example, UE 402 may send a transmission that reserves resources for a first transmission. The first transmission of a packet may reserve resources for the next transmission of the packet. Other devices (such as UEs 404 and 406 and RSC 407) may avoid using the resources reserved by UE 402 for transmission. By avoiding resources reserved for transmissions by other devices, interference experienced by receiving devices may be reduced.

[0078] In some aspects, the transmitting UE 402 may retransmit a packet only if the intended recipient did not correctly receive the packet. For example, if the recipient UE 404 responds to the transmitting UE 402 with a NACK (e.g., based on failure to correctly receive the packet), the transmitting UE 104 may determine that the packet is to be retransmitted. However, if the UE 402 does not receive a NACK from any intended recipient, the UE 402 may determine that retransmission of the packet is not necessary and may refrain from retransmitting the packet.

[0079] Further, the other device that avoids transmitting on the reserved resources of UE 402 may monitor for NACKs from the intended recipient of UE 402. If the other device detects a NACK from the intended recipient of UE 402, the other device may avoid using the resources reserved for retransmissions. If the other device does not detect a NACK from the intended recipient of UE 402, the other device may determine that the reserved resources will not be used by UE 402 for retransmissions and the other device may transmit communications using the reserved resources.

[0080] In some scenarios, the reservation of resources may not completely avoid conflicts between transmissions. For example, two devices may reserve resources at the same time. The two devices may not know the other reservation and may transmit in an overlapping manner that interferes with the transmission of another device. For example, a transmitting device may be a hidden node of another device. Illustratively, when the transmitting UE 402 transmits the reservation, the interfering device may be outside the link budget range of the control transmission for UE 402, but the interfering device may still use a sufficiently strong transmission that is enough to interrupt the reception at the receiving side to transmit. For example, if UE 408 transmits the resource reservation and UE 402 transmits the resource reservation, the two UEs may not know the potential interference because UE 408 is outside the range 401 of UE 402. However, the transmission from UE 402 may conflict with the transmission from UE 408 when received by UE 404.

[0081] Figure 5 is a diagram showing an example of a hidden node scenario 500. Figure 5, device A 510 is traveling on a first road, and devices B 512 and C 514 are on a second road. Device B 512 may be outside the protected radius (e.g., expected range) of device A 510. Therefore, the same time and frequency resources may be used for transmissions of device A 510 and device B 512. Device C 514 may be the intended recipient of the transmission 502 from device A 510. However, since the channel is a non-line-of-sight (NLOS) channel, the signal from device A 510 to device C 514 may be weak. In contrast, the interference experienced by device B 512 due to the transmission 504 of device C 514 may be significant, for example, because there is a line-of-sight (LOS) condition about device B 512 and device C 514. As a result, device C 514 may not be able to correctly receive and decode the transmission 502 from device A 510.

[0082] Relatedly, Figure 6 6 is a graph showing a comparison of path loss 602 with distance for NLOS communication and path loss 604 with distance for LOS communication. Illustratively, if a path loss of less than 100 decibels (dB) is considered acceptable for communication between two devices based on V2X or other D2D communication in an NLOS scenario, then by the time a distance of 50 meters is reached, the path loss 602 is already at 100 dB. In contrast, LOS conditions may not reach a similar level of path loss 604 until a distance of 500 meters. Figure 5 In the context of , device B 512 may interfere with the reception of transmissions from device A 510 by device C 514, even at a greater distance.

[0083] The present disclosure provides a method for transmitting a signal to a receiving device (e.g., Figure 4 UE 404, Figure 5 Various techniques and methods for reducing interfering transmissions based on overlapping reservations between two or more transmitting devices are provided. In response to receiving the conflict indication, one of the transmitting devices may back off to not transmit on the resources indicated by the corresponding reservation. For example, in Figure 4 In , the receiving UE 404 may send a conflict indication to the transmitting UE 402 or the transmitting UE 408 to inform the transmitting UE that the resources are reserved, and the transmitting UE performs a non-clear send (CTS) transmission on the reserved resources. Figure 5 For example, device C 514 may send an indication to device A 510 or device B 512 using such a conflict indication.

[0084] According to some aspects, the receiving device may determine that a conflict will occur between the reserved resources when the reserved resources overlap at least partially; that is, the resources reserved by the two transmitting devices appear on at least some of the same time / frequency resources. The receiving device may also consider measurements of signals from the two transmitting devices. For example, if the difference between the measurements of the signals from the two transmitting devices is at a threshold level and / or within a range (such as a preconfigured threshold level and / or a preconfigured range), the receiving device may determine a conflict. These measurements may include, for example, reference signal received power (RSRP), signal-to-noise ratio (SNR), signal-to-interference-plus-noise ratio (SINR), reference signal received quality (RSRQ), and / or other similar measurements. In some aspects, the receiving device may base the determination on the distance between the receiving device and each transmitting device (e.g., the distance between device C 514 and device A 510, and the distance between device C 514 and device B 512). In some further aspects, the receiving device may base the determination on the distance between the two transmitting devices (e.g., the distance between device A 510 and device B 512).

[0085] The receiving device may notify device A and device B of the potential conflict. The transmitting device that receives the indication may back off and refrain from using the reserved resources for transmission. If the receiving device transmits a conflict indication to both transmitting devices, this may result in a waste of resources because both transmitting devices may back off and avoid using the reserved resources. Additionally, the transmitting device may attempt to reserve a later resource to transmit the message, which may result in another conflict. Thus, by transmitting a conflict indication to one transmitting device, the receiving device facilitates interference reduction while enabling other transmissions to continue.

[0086] The various aspects presented herein enable a receiving device to determine which conflicting transmission should be made in a unified manner. Thus, if there are multiple receiving devices affected by a potential conflict, one of the receiving UEs can identify the same transmitting device that should be notified of the conflict. Thus, a global rule can be applied by the receiving device to determine which transmitting device to notify of the conflict.

[0087] Figure 7 706.

[0088] The receiving device 704 may perform identification 707 of potential conflicts between resources reserved by the first transmitting device 702 and the second transmitting device 706 based on at least one of the resource reservations 701, 703 from the first transmitting device 702 and the resource reservation 705 from the second transmitting device 706. In some aspects, the receiving device 704 may base the identification 707 on an overlap in time / frequency of resources scheduled by the first transmitting device 702 and the second transmitting device 706. For example, the receiving device 704 may identify a first set of time / frequency resources included in one of the resource reservations 701, 703, and / or may identify a second set of time / frequency resources included in the other of the resource reservations 701, 703 received from the first transmitting device 702. Further, the receiving device 704 may identify a third set of time / frequency resources included in the resource reservation 705 received from the second transmitting device 706. The receiving device 704 may then compare the first and / or second time / frequency resource sets with the third time / frequency resource set, and the receiving device 704 may determine whether the first and / or second time / frequency resource sets at least partially overlap with the third time / frequency resource set. When the receiving device 704 determines that the first and / or second time / frequency resource sets at least partially overlap (e.g., in both time and frequency), the receiving device 704 may make an identification 707 of a potential conflict.

[0089] Additionally or alternatively, the receiver device 704 may base the identification 707 on a difference in a channel quality value (e.g., RSRP, SNR, SINR, RSRQ, etc.) measured between at least one of the resource reservations 701, 703 from the first transmitter device 702 and the resource reservation 705 from the second transmitter device 706. For example, the receiver device 704 may measure a first channel quality value based on receiving one of the resource reservations 701, 703, and may measure a second channel quality value based on receiving the other of the resource reservations 701, 703 from the first transmitter device 702. The receiver device 704 may then measure a third channel quality value based on receiving the resource reservation 705 from the second transmitter device 706. The receiver device 704 may compare the first and / or second channel quality values ​​with the third channel quality value, for example, to determine a difference value. Subsequently, the receiver device 704 may compare the difference value(s) with a channel quality threshold and / or may determine whether the difference value(s) falls within a channel quality range. When the receiving device 704 determines that the difference(s) meet the channel quality threshold and / or are within the channel quality range, the receiving device 704 may make an identification 707 of a potential conflict.

[0090] Additionally or alternatively, the recipient device 704 may base the identification on a first distance between the first transmitter device 702 and the recipient device 704 and a second distance between the second transmitter device 706 and the recipient device 704. For example, the recipient device 704 may measure the first distance between the recipient device 704 and the first transmitter device 702 (e.g., based on receiving one of the resource reservations 701, 703 from the first transmitter device 702). The recipient device 704 may then measure the second distance between the recipient device 704 and the second transmitter device (e.g., based on receiving the resource reservation 705 from the second transmitter device 706). The recipient device 704 may compare the first distance with the second distance, for example, to determine a difference. Subsequently, the recipient device 704 may compare the difference with a first distance threshold and / or may determine whether the difference falls within a first distance range. When the receiving device 704 determines that the difference satisfies the first distance threshold and / or falls within the first distance range, the receiving device 704 may identify 707 a potential conflict.

[0091] Additionally or alternatively, the receiver device 704 may base the identification on the distance between the first transmitter device 702 and the second transmitter device 706. For example, the receiver device 704 may measure the distance between the first transmitter device 702 and the second transmitter device (e.g., based on receiving one of the resource reservations 702, 703 from the first transmitter device 702 and further based on receiving the resource reservation 705 from the second transmitter device 706). Subsequently, the receiver device 704 may compare the distance with a second distance threshold and / or may determine whether the difference falls within a second distance range. When the receiver device 704 determines that the distance meets the second distance threshold and / or falls within the second distance range, the receiver device 704 may make an identification 707 of a potential conflict.

[0092] Based on the identification of the potential conflict 707, the receiving device 704 can make a determination 709 about where to send feedback about the conflict, which can be based on one or more rules, for example, as further described herein. In other words, the receiving device 704 can determine which of the transmitting devices 702, 706 should be notified of the identified conflict. The receiving device 704 can generate the conflict indication as a non-CTS 711, which can indicate that the channel is not clear to send the transmission.

[0093] In some aspects, the receiving device 704 may transmit an indication (e.g., included in the non-CTS 711) to the transmitting device 702, 706 that indicated the resource reservation at a later time. For example, if the second transmitting device 706 transmits a resource reservation 705 and the first transmitting device 702 transmits a second resource reservation 703 (which at least partially overlaps with the resource reservation 705) after the second transmitting device 706 transmits the resource reservation 705, then the receiving device 704 may transmit the non-CTS 711 to the first transmitting device 702. The determination of the later reservation may be based on the signal arrival time at the receiving device 704. Therefore, whichever resource reservation signal arrives later at the receiving device 704 may be identified as a non-clear-send transmission or a transmitting device that should be notified of the conflict.

[0094] If these resource reservation signals arrive at the receiving device 704 at the same time, for example, if the transmitting device 702 sends a resource reservation 701, the receiving device 704 may send the indication to the first transmitting device 702 having the resource reservation 701 associated with a lower priority than the resource reservation 705 from the second transmitting device 706. The respective priorities may be based on the priority of the communication to be transmitted. The priority level may be based on the respective QoS and / or 5G QoS identifier (5QI) for the respective communication, which may potentially be indicated by each of the resource reservations 701, 703, 705.

[0095] If the resource reservations 701, 705 arrive at the receiving device 704 at the same time and the transmitting devices 702, 706 have the same priority, the receiving device 704 may make a determination 709 based on the resources reserved by the transmitting devices 702, 706 according to the resource reservations 701, 705. For example, the receiving device 704 may use the starting RB and / or ending RB of the two reserved resource sets to determine which of the two transmitting devices 702, 706 should receive the non-CTS 711. For example, the receiving device 704 may determine that the non-CTS 711 should be transmitted to the one of the transmitting devices 702, 706 that reserves the latest starting RB. However, if the two reserved resource sets have the same starting RB, the receiving device 704 may determine that the non-CTS should be sent to the one of the transmitting devices 702, 706 that reserves the latest ending RB of the two reserved resource sets.

[0096] If these resource reservation signals arrive at the receiving device 704 at the same time, the transmitting devices have the same priority and the reserved resources correspond to the same resource blocks, the receiving device 702 can use the respective device identifiers (IDs) (e.g., UE IDs) of the transmitting devices 702, 706 to determine which of the transmitting devices 702, 706 should receive the non-CTS 711. The resource reservations 701, 705 can be considered to arrive at the receiving device 704 at the same time if they arrive within a threshold time of each other or if the receiving device 704 is unable to determine which of the resource reservations 701, 705 was sent first.

[0097] If these resource reservation signals arrive at the receiving device 704 at the same time, the transmitting devices 702, 706 have the same priority, and the reserved resources correspond to the same resource block, and the device IDs correspond to the same device ID, the receiving device 704 may randomly select the transmitting device that should back off from transmitting.

[0098] Upon making a determination as to which of the transmitting devices 702, 706 will receive the non-CTS 711, the receiving device 704 may send an indication to the determined transmitting device. Figure 7 , the receiving device 704 makes a determination 709 that a conflict feedback is to be sent to the first transmitting device 702; therefore, the receiving device 704 may transmit a non-CTS 711 to the first transmitting device 702. The non-CTS 711 may indicate a conflict, may inform the transmitting device 702 that the transmitting device is not sending unimpeded, may indicate that the first transmitting device 702 should back off from transmitting, etc. In response, the transmitting device 702 may refrain 713 from transmitting using the reserved resources indicated in the first or second resource reservation 701, 703 (e.g., the non-CTS 711 may indicate on which resources to refrain from transmitting).

[0099] The non-CTS 711 may be sent by the receiving device 704 using a shared resource. The shared resource may allow the transmitting device 702, 706 to know the resources to monitor for such non-CTS and / or other conflict indications. The non-CTS 711 may be transmitted in a single frequency network manner, which may increase the chance of reception. The shared resource may be a resource reserved by the transmitting device 702, 706 for such non-CTS and / or other conflict indications. For example, at least one of the transmitting devices 702, 706 may transmit information indicating to the receiving device 704 the resources to be used to send feedback on whether the transmitting device may continue to use the reserved resources for transmission and / or whether the transmitting device should back off. In some aspects, the shared resource may be indicated in one of the resource reservations 701, 703, 705. Alternatively, the receiving device 704 may send the indication as feedback on a feedback channel (such as a physical sidelink feedback channel (PSFCH)). For example, for multicast, an acknowledgment sequence may be used to indicate a conflict and / or non-CTS between the reserved resources.

[0100] Based on receiving the non-CTS 711, the first transmitting device 702 may refrain 713 or back off from transmitting communications using the reserved resources. Thus, the first transmitting device 702 may refrain from transmitting during the resources indicated in at least one of the resource reservations 701, 703. The second transmitting device 706, which has not received any feedback indicating a non-CTS or a collision from the receiving device 704, may proceed with a transmission 715 using the resources reserved by the resource reservation 705.

[0101] Figure 8 8 is a flow chart of a wireless communication method 800. The method 800 may be performed by a UE, a recipient device, and / or other apparatus (e.g., UE 104, 350, 404; recipient device 514, 704; RSC 107, 407; apparatus 1002). According to various aspects, one or more of the illustrated operations may be omitted, swapped, and / or performed concurrently.

[0102] At 802, a receiving device receives a first resource reservation from a first transmitting device. In some aspects, the first resource reservation may include information indicating a priority, such as QoS and / or 5QI. In some other aspects, the first resource reservation may indicate at least one resource associated with a conflict indication, such as at least one feedback resource and / or at least one common resource. The at least one resource may be on a feedback channel (e.g., PSFCH) and / or may be on a common channel, a multicast channel, and / or a broadcast channel.

[0103] For example, refer to Figure 4 , the receiving UE 404 and / or the RSC 407 may receive a first resource reservation from the transmitting UE 402. Figure 5, device C 514 may receive a resource reservation from device A 510. Figure 7 , the recipient device 704 may receive the first and / or second resource reservations 701 , 703 from the first transmitter device 702 .

[0104] At 804, the receiving device receives a second resource reservation from the second transmitting device. In some aspects, the second resource reservation may include information indicating a priority, such as QoS and / or 5QI. In some other aspects, the second resource reservation may indicate at least one resource associated with the conflict indication, such as at least one feedback resource and / or at least one common resource. The at least one resource may be on a feedback channel (e.g., PSFCH) and / or may be on a common channel, a multicast channel, and / or a broadcast channel.

[0105] For example, refer to Figure 4 , the receiving UE 404 and / or the RSC 407 may receive a second resource reservation from one of the transmitting UEs 406, 408. Figure 5 , device C 514 may receive a resource reservation from device B 512. Figure 7 , the recipient device 704 may receive a resource reservation 705 from a second transmitter device 706 .

[0106] The receiving UE may identify a conflict between first resources reserved by the first transmitting device and second resources reserved by the second transmitting device at 806. In some aspects, the receiving device may compare a first set of resources reserved by the first resource reservation with a second set of resources reserved by the second resource reservation by first comparing the first set of resources and the second set of resources, and then determining that the first set of resources and the second set of resources include at least overlapping resource subsets (e.g., on the same time / frequency resources).

[0107] In some other aspects, the receiving device may identify a conflict between a first resource reserved by the first transmitting device and a second resource reserved by the second transmitting device based on corresponding measurements in signals received from the first and second transmitting devices. For example, the receiving device may measure at least one first value (e.g., RSRP, SNR, SINR, RSRQ, etc.) based on the signal received from the first transmitting device, and may measure at least one second value (e.g., RSRP, SNR, SINR, RSRQ, etc.) based on the signal received from the second transmitting device. The receiving device may compare the at least one first value with the at least one second value to determine whether the difference between the values ​​of the signals from the two transmitting devices is within a threshold level and / or within a range (such as a preconfigured threshold level and / or a preconfigured range).

[0108] In some further aspects, the receiving device may identify a conflict between a first resource reserved by a first transmitting device and a second resource reserved by a second transmitting device based on a distance between the receiving device and each transmitting device (e.g., a distance between the receiving device and the first transmitting device, and a distance between the receiving device and the second transmitting device). In still further aspects, the receiving device may identify a conflict between a first resource reserved by a first transmitting device and a second resource reserved by a second transmitting device based on a distance between the two transmitting devices (e.g., a distance between the first and second transmitting devices). The receiving device may determine each distance based on geographic location information associated with each of the receiving device, the first transmitting device, and the second transmitting device.

[0109] For example, refer to Figure 4 , the receiving UE 404 and / or the RSC 407 may identify a conflict between a first resource reserved by the transmitting UE 402 and a second resource reserved by the transmitting UE 406 or the transmitting UE 408. Figure 5 , device C 514 may identify a conflict between a first resource reserved by transmitting device A 510 and a second resource reserved by transmitting device B 512. Figure 7 , the recipient device 704 may make an identification 707 of a potential conflict between resources reserved by one of the resource reservations 701 , 703 from the first transmitting device 702 and resources reserved by the resource reservation 705 from the second transmitting device 706 .

[0110] At 808, the receiving device may determine to transmit a conflict indication to the first transmitting device or the second transmitting device based on the identified conflict. In some aspects, the receiving device may determine a first time (e.g., an arrival time or a timestamp) of receipt of a first resource reservation from the first transmitting device, and may determine a second time (e.g., an arrival time or a timestamp) of receipt of a second resource reservation from the second transmitting device. The receiving device may determine which of the first time or the second time is earlier, and the receiving device may determine to transmit a conflict indication to the second transmitting device based on the second resource reservation being associated with the second time (which is later than the first time associated with the first resource reservation).

[0111] In some other aspects, the receiving device may receive a first resource reservation from a first transmitting device simultaneously with receiving a second resource reservation from a second transmitting device (e.g., based on a signal arrival time at the receiving device or based on a timestamp). The receiving device may determine a respective priority associated with each of the first and second resource reservations (of the first and second transmitting devices), and the receiving device may determine to send a conflict indication to the first transmitting device or the second transmitting device based at least in part on which respective priority between the first resource reservation from the first transmitting device and the second resource reservation from the second transmitting device is relatively higher.

[0112] In some further aspects, the receiving device may receive a first resource reservation from a first transmitting device simultaneously with receiving a second resource reservation from a second transmitting device, and the first transmitting device and the second transmitting device (or the first resource reservation and the second resource reservation) are associated with the same priority. The receiving device may determine, at least in part, to send a conflict indication to the first transmitting device or the second transmitting device based on the corresponding starting RB and / or the corresponding ending RB reserved by each of the first resource reservation and the second resource reservation. For example, the receiving device may determine which of the first resource reservation and the second resource reservation reserves an earlier starting RB (or an earlier ending RB), and the receiving device may determine to send a conflict indication to the first transmitting device or the second transmitting device that reserves the earliest starting RB (or the earliest ending RB).

[0113] In some additional aspects, the receiving device may receive a first resource reservation from a first transmitting device simultaneously with receiving a second resource reservation from a second transmitting device, and the first transmitting device and the second transmitting device (or the first resource reservation and the second resource reservation) have the same priority and the same resource allocation. The receiving device may then determine, at least in part based on a first device ID (e.g., UE ID) of the first transmitting device and a second device ID (e.g., UE ID) of the second transmitting device, to transmit a conflict indication to the first transmitting device or the second transmitting device. For example, the receiving device may determine which of the first transmitting device or the second transmitting device has a relatively lower UE ID.

[0114] In still further aspects, the receiving device may receive a first resource reservation from a first transmitting device simultaneously with receiving a second resource reservation from a second transmitting device, and the first transmitting device and the second transmitting device (or the first resource reservation and the second resource reservation) have the same priority and the same resource allocation, and further have corresponding device IDs (e.g., the same device ID) from which the receiving device cannot determine which is lower. Accordingly, the receiving device may randomly select the first transmitting device or the second transmitting device to which to transmit the conflict indication.

[0115] For example, refer to Figure 4 , the receiving UE 404 and / or the RSC 407 may determine to transmit a conflict indication to one of the transmitting UEs 402, 406, 408. Figure 5 , device C 514 may determine to transmit a conflict indication to one of device A 510 or device B 512. Figure 7 , the receiving device 704 may make a determination 709 as to which of the first transmitting device 702 or the second transmitting device 706 to transmit the non-CTS 711 .

[0116] At 810, the receiving device may transmit a conflict indication to the determined one of the first transmitting device or the second transmitting device. In some aspects, the conflict indication may include a non-CTS signal. In some other aspects, the receiving device may transmit the conflict indication on a feedback channel (e.g., PSFCH). In still further aspects, the receiving device may transmit the conflict indication on at least one resource (e.g., at least one common resource) indicated by the determined one of the first transmitting device or the second transmitting device (e.g., in a corresponding one of the first resource reservation or the second resource reservation).

[0117] For example, refer to Figure 4 , the receiving UE 404 and / or the RSC 407 may transmit a conflict indication to the determined one of the transmitting UEs 402, 406, 408. Figure 5 , device C 514 may transmit a conflict indication to the determined one of device A 510 or device B 512. Figure 7 , the receiving device 704 may transmit a non-CTS 711 to the first transmitting device 702 based on the determination 709 of where to transmit the feedback.

[0118] At 812, the receiving device may receive the transmission on resources reserved by one of the first resource reservation or the second resource reservation that corresponds to the other of the first transmitting device or the second transmitting device (not the determined one). Figure 4, the receiving UE 404 and / or the RSC 407 may receive one of the transmissions 414, 416, 420 from another (not the determined one) of the transmitting UEs 402, 406, 408. Figure 5 , device C 514 may receive one of the transmissions 502, 504 from the other of device A 510 or device B 512 (not the determined one). Figure 7 , the recipient device 704 may receive a transmission 715 from the second transmitter device 706 on the reserved resources.

[0119] Fig. 9 900 is a flow chart of a wireless communication method. The method 900 may be performed by a UE, a transmitting device, and / or other apparatus (e.g., UE 104', 104", 350, 402, 406, 408; transmitting device 510, 512, 702, 706; RSC 107, 407; apparatus 1102). According to various aspects, one or more of the illustrated operations may be omitted, swapped, and / or performed concurrently.

[0120] At 902, a transmitting device may transmit a resource reservation for transmission from the transmitting device to at least one receiving device. In some aspects, the resource reservation may include information indicating a priority, such as QoS and / or 5QI. In some other aspects, the resource reservation may indicate at least one resource associated with a conflict indication, such as at least one feedback resource and / or at least one common resource. The at least one resource may be on a feedback channel (e.g., PSFCH) and / or may be on a common channel, a multicast channel, and / or a broadcast channel.

[0121] For example, refer to Figure 4 , the transmitting UE 402 may transmit the resource reservation to the receiving UE 404 and / or the RSC 407. Figure 5 , device A 510 may transmit a resource reservation to device C 514. Figure 7 , the first transmitting device 702 may transmit the first and / or second resource reservation 701 , 703 to the receiving device 704 .

[0122] At 904, the transmitting device may receive, from a receiving device of the at least one receiving device, a conflict indication regarding a conflict between resources reserved by the resource reservation and resources reserved by another transmitting device. The transmitting device may receive the conflict indication in a conflict indication resource reserved by the transmitting device for the conflict indication. The transmitting device may indicate the conflict indication resource in the resource reservation. The transmitting device may receive the conflict indication on a feedback channel (e.g., PSFCH), a shared channel, a multicast channel, and / or a broadcast channel. The conflict indication may include a feedback sequence for a non-CTS indication.

[0123] For example, refer to Figure 4 , the transmitting UE 402 may receive a conflict indication from the receiving UE 404 and / or the RSC 407. Figure 5 , device A 510 may receive a conflict indication from device C 514. Figure 7 , the first transmitting device 702 may receive a non-CTS 711 from the receiving device 704 .

[0124] At 906, the transmitting device backs off from transmitting on the resources reserved by the resource reservation in response to receiving the conflict indication from the receiving device. For example, the transmitting device may refrain from transmitting on the resources reserved by the resource reservation in response to receiving the conflict indication from the receiving device, or the transmitting device may reduce the transmit power. Illustratively, the transmitting device may determine a time period to refrain from transmitting during the resources reserved by the resource reservation in response to receiving the conflict indication from the receiving device (e.g., based on a timer started in response to receiving the conflict indication), and the transmitting device may refrain from transmitting during the resources reserved by the resource reservation for the duration of the time period. After the time period, the transmitting device may determine whether the resources reserved earlier by the resource reservation are now clear (e.g., no interfering transmissions are detected), and the transmitting device may transmit. In another illustration, the transmitting device may determine an amount by which the transmit power is to be reduced, and the transmitting device may then transmit using the reduced transmit power during the resources reserved by the resource reservation.

[0125] For example, refer to Figure 4 , the transmitting UE 402 may back off from transmitting 414 on the resources reserved by the resource reservation. Figure 5 , device A 510 may back off transmission 502. Figure 7 , the first transmitting device 702 may refrain from transmitting on the resources reserved by the first or second resource reservation 701 , 703 in response to receiving a non-CTS 711 from the receiving device 704 .

[0126] In some aspects, the transmitting device may back off from transmitting during the resources reserved by the resource reservation by refraining from transmitting the transmission on the resources reserved by the resource reservation for at least the duration of the backoff timer, as shown at 920. For example, the transmitting device may start a backoff timer (e.g., a countdown timer) in response to receiving the conflict indication.

[0127] For example, refer to Figure 4 , the transmitting UE 402 may refrain from transmitting a transmission 414 on the resources reserved by the resource reservation for at least the duration of the backoff timer. Figure 5 , device A 510 may refrain from transmitting transmissions 502 on the resources reserved by the resource reservation for at least the duration of the backoff timer. Figure 7 , the first transmitting device 702 may refrain from transmitting on the resources reserved by the first or second resource reservation 701 , 703 in response to receiving a non-CTS 711 from the receiving device 704 .

[0128] When the backoff timer expires (or counts up to a predetermined time), then at 922, the transmitting device may transmit another resource reservation for the transmission from the transmitting device. Figure 4 , the transmitting UE 402 may transmit another resource reservation for transmission 414 after the duration of the backoff timer. Figure 5 , device A 510 may refrain from transmitting transmissions 502 on the resources reserved by the resource reservation for at least the duration of the backoff timer. Figure 7 , the first transmitting device 702 may refrain from transmitting on the resources reserved by the first or second resource reservation 701 , 703 in response to receiving a non-CTS 711 from the receiving device 704 .

[0129] Fig.101 is a diagram 1000 illustrating an example of a hardware implementation of a device 1002. The device 1002 may be a UE (e.g., UE 104) and includes a cellular baseband processor 1004 (also referred to as a modem) coupled to a cellular RF transceiver 1022 and one or more subscriber identity modules (SIM) cards 1020, an application processor 1006 coupled to a secure digital (SD) card 1008 and a screen 1010, a Bluetooth module 1012, a wireless local area network (WLAN) module 1014, a global positioning system (GPS) module 1016, and a power supply 1018. The cellular baseband processor 1004 communicates with the UE 104', the RSC 107, and / or the BS 102 / 180 via the cellular RF transceiver 1022. The cellular baseband processor 1004 may include a computer-readable medium / memory. The computer-readable medium / memory may be non-transitory. The cellular baseband processor 1004 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the cellular baseband processor 1004, causes the cellular baseband processor 1004 to perform the various functions described above. The computer-readable medium / memory may also be used to store data manipulated by the cellular baseband processor 1004 when executing the software. The cellular baseband processor 1004 further includes a receiving component 1030, a communication manager 1032, and a transmitting component 1034. The communication manager 1032 includes one or more of the illustrated components. The components within the communication manager 1032 may be stored in a computer-readable medium / memory and / or configured as hardware within the cellular baseband processor 1004. The cellular baseband processor 1004 may be a component of the UE 350 and may include a memory 360 and / or at least one of the following: a TX processor 368, an RX processor 356, and a controller / processor 359. In one configuration, the device 1002 may be a modem chip and include only the baseband processor 1004, and in another configuration, the device 1002 may be the entire UE (e.g., see Figure 3 350) and includes the aforementioned additional modules of device 1002.

[0130] The receiving component 1030 may be configured to receive a first resource reservation from a transmitting UE 104′, for example, as described in conjunction with Figure 8 The receiving component 1030 may be further configured to receive a second resource reservation from the transmitting RSC 107, for example, as described in conjunction with Figure 8 804. The receiving component 1030 can provide input to the conflict identification component 1040 based on the first resource reservation and the second resource reservation.

[0131] The communication manager 1032 includes a conflict identification component 1040 configured to identify a conflict between a first resource reserved by the transmitting UE 104′ and a second resource reserved by the RSC 107, for example, as combined with Figure 8 The communication manager 1032 further includes a device selection component 1042 that receives input based on the identified conflict from the conflict identification component 1040 and is configured to transmit a conflict indication to the transmitting UE 104' or RSC 107 based on the identified conflict, for example, as described in conjunction with Figure 8 As described in 808.

[0132] The communication manager 1032 further includes a conflict indication component 1044 that receives input based on the determined one of the transmitting UE 104' or the RSC 107 from the device selection component 1042. The conflict indication component 1044 is configured to generate a conflict indication for transmission to the transmitting UE 104' or the determined one of the RSC 107, for example, as combined with Figure 8 As described in 810.

[0133] Further, receiving component 1030 may be configured to receive a transmission on resources reserved by the other of transmitting UE 104' or RSC 107 (not the determined one).

[0134] The device may include executing the aforementioned Figure 7 Call flow diagram and / or Figure 8 The additional components of each box of the algorithm in the flowchart. Figure 7 Call flow diagram and / or Figure 8 Each block in the flowchart of can be performed by a component and the device may include one or more of these components. These components can be one or more hardware components specially configured to perform the process / algorithm, implemented by a processor configured to perform the process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0135] In one configuration, the device 1002, and in particular the cellular baseband processor 1004, includes: a device for identifying a conflict between a first resource reserved by a first transmitting device and a second resource reserved by a second transmitting device; and a device for transmitting a conflict indication to the first transmitting device or the second transmitting device based on the identified conflict.

[0136] In one aspect, identification of a conflict is based on an overlap between the first resource and the second resource.In one aspect, identification of a conflict is further based on a difference in measured RSRP of a first signal indicating a first resource reserved by the first transmitting device and a second signal indicating a second resource reserved by the second transmitting device.

[0137] In one aspect, identification of a conflict is further based on a distance between the recipient device and the first transmitting device and the second transmitting device or between the first transmitting device and the second transmitting device.

[0138] In one aspect, the device 1002, and in particular the cellular baseband processor 1004, may include: a device for receiving a first resource reservation from a first transmitting device; and a device for receiving a second resource reservation from a second transmitting device after receiving the first resource reservation, and the conflict indication is transmitted to the second transmitting device based on the second resource reservation being received after the first resource reservation.

[0139] In one aspect, the device 1002, and in particular the cellular baseband processor 1004, may include: a device for receiving a first resource reservation from a first transmitting device simultaneously with receiving a second resource reservation from a second transmitting device; and a device for determining whether to transmit the conflict indication to the first transmitting device or the second transmitting device based at least in part on a first communication priority associated with the first transmitting device and a second communication priority associated with the second transmitting device.

[0140] In one aspect, the device 1002, and in particular the cellular baseband processor 1004, may include: a device for receiving a first resource reservation from a first transmitting device simultaneously with receiving a second resource reservation from a second transmitting device, and the first transmitting device and the second transmitting device have the same priority; and a device for determining whether to transmit a conflict indication to the first transmitting device or the second transmitting device based at least in part on the starting RB of the first resource and the starting RB of the second resource.

[0141] In one aspect, the device 1002, and in particular the cellular baseband processor 1004, may include: a device for receiving a first resource reservation from a first transmitting device simultaneously with receiving a second resource reservation from a second transmitting device, and the first transmitting device and the second transmitting device have the same priority; and a device for determining whether to transmit a conflict indication to the first transmitting device or the second transmitting device based at least in part on the ending RB of the first resource and the ending RB of the second resource.

[0142] In one aspect, the device 1002, and in particular the cellular baseband processor 1004, may include: a device for receiving a first resource reservation from a first transmitting device simultaneously with receiving a second resource reservation from a second transmitting device, and the first transmitting device and the second transmitting device have the same priority and the same resource allocation; and a device for determining whether to transmit a conflict indication to the first transmitting device or the second transmitting device based at least in part on a first device ID of the first transmitting device and a second device ID of the second transmitting device.

[0143] In one aspect, the device 1002, and in particular the cellular baseband processor 1004, may include: a device for receiving a first resource reservation from a first transmitting device simultaneously with receiving a second resource reservation from a second transmitting device, and the first transmitting device and the second transmitting device have the same priority, have the same resource allocation, and are associated with the same set of bits for the device ID; and a device for randomly determining whether to transmit a conflict indication to the first transmitting device or the second transmitting device.

[0144] In one aspect, the conflict indication is transmitted by the first transmitting device or the second transmitting device on resources reserved for the conflict indication.

[0145] In one aspect, the device 1002, and in particular the cellular baseband processor 1004, may include: a device for receiving a first resource reservation with an associated first conflict indication resource from a first transmitting device; and a device for receiving a second resource reservation with a second conflict indication resource from a second transmitting device after receiving the first resource reservation, and the conflict indication is transmitted using the associated first conflict indication resource or the associated second conflict indication resource.

[0146] In one aspect, the conflict indication is transmitted on a feedback channel. In one aspect, the conflict indication comprises a feedback sequence for a non-CTS indication.

[0147] The aforementioned means may be one or more of the aforementioned components in the device 1002 configured to perform the functions recited by the aforementioned means. As described above, the device 1002 may include the TX processor 368, the RX processor 356, and the controller / processor 359. Thus, in one configuration, the aforementioned means may be the TX processor 368, the RX processor 356, and the controller / processor 359 configured to perform the functions recited by the aforementioned means.

[0148] Fig.111100 is an example of a hardware implementation of an illustrative device 1102. The device 1102 is a UE and includes a cellular baseband processor 1104 (also referred to as a modem) coupled to a cellular RF transceiver 1122 and one or more subscriber identity modules (SIM) cards 1120, an application processor 1110 coupled to a secure digital (SD) card 1108 and a screen 1110, a Bluetooth module 1112, a wireless local area network (WLAN) module 1114, a global positioning system (GPS) module 1116, and a power supply 1118. The cellular baseband processor 1104 communicates with the UE 104, the RSC 107, and / or the BS 102 / 180 through the cellular RF transceiver 1122. The cellular baseband processor 1104 may include a computer-readable medium / memory. The computer-readable medium / memory may be non-transitory. The cellular baseband processor 1104 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the cellular baseband processor 1104, causes the cellular baseband processor 1104 to perform the various functions described above. The computer-readable medium / memory may also be used to store data manipulated by the cellular baseband processor 1104 when executing the software. The cellular baseband processor 1104 further includes a receiving component 1130, a communication manager 1132, and a transmitting component 1134. The communication manager 1132 includes one or more of the illustrated components. The components within the communication manager 1132 may be stored in a computer-readable medium / memory and / or configured as hardware within the cellular baseband processor 1104. The cellular baseband processor 1104 may be a component of the UE 350 and may include a memory 360 and / or at least one of the following: a TX processor 368, an RX processor 356, and a controller / processor 359. In one configuration, the device 1102 may be a modem chip and include only the baseband processor 1104, and in another configuration, the device 1102 may be the entire UE (e.g., see Figure 3 350) and includes the aforementioned additional modules of device 1102.

[0149] The communication manager 1132 includes a resource reservation component 1140 configured to generate a resource reservation for a transmission to a recipient UE 104 and / or RSC 107. The transmitting component 1034 can transmit the resource reservation for the transmission to the recipient UE 104 and / or RSC 107, for example, in conjunction with Fig. 9 902 as described. The communication manager 1132 further includes a CTS component 1142 that receives input from the receiving component 1130 and is configured to receive a conflict indication from at least one of the receiving UE 104 and / or the RSC 107 regarding a conflict between resources reserved by the resource reservation and resources reserved by another transmitting device, for example, as combined Fig. 9904. The communication manager 1132 further includes a backoff component 1144 that receives input based on the conflict indication from the CTS component 1142 and is configured to back off from transmitting on the resources reserved by the resource reservation in response to receiving the conflict indication from at least one of the receiving UE 104 and / or the RSC 107, for example, as combined with Fig. 9 As described in 906.

[0150] The backoff component 1144 can be further configured to refrain from transmitting a transmission on the resources reserved by the resource reservation for at least the duration of the backoff timer, e.g., as described in conjunction with Fig. 9 920. The backoff component 1144 can provide input to the resource reservation component 1140, and the resource reservation component 1140 can be configured to generate another resource reservation for the transmission to at least one of the recipient UE 104 and / or the RSC 107 after the duration of the backoff timer. The transmitting component 1134 can transmit the resource reservation for the transmission to at least one of the recipient UE 104 and / or the RSC 107 after the duration of the backoff timer, for example, as combined Fig. 9 of 922 described.

[0151] The device may include executing the aforementioned Figure 7 Call flow diagram and / or Fig. 9 The additional components of each box of the algorithm in the flowchart. Figure 7 Call flow diagram and / or Fig. 9 Each block in the flowchart of can be performed by a component and the device may include one or more of these components. These components can be one or more hardware components specially configured to perform the process / algorithm, implemented by a processor configured to perform the process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0152] In one configuration, the device 1102, and in particular the cellular baseband processor 1104, includes: a device for transmitting a resource reservation for transmission from the transmitting device to at least one receiving device; a device for receiving a conflict indication from a receiving device among the at least one receiving device regarding a conflict between resources reserved by the resource reservation and resources reserved by another transmitting device; and a device for backing off from transmitting on the resources reserved by the resource reservation in response to receiving the conflict indication from the receiving device.

[0153] In one aspect, the conflict indication is received on a conflict indication resource reserved for the conflict indication. In one aspect, the resource reservation includes the conflict indication resource. In one aspect, the conflict indication is received on a feedback channel. In one aspect, the conflict indication includes a feedback sequence for a non-CTS indication.

[0154] In one aspect, the apparatus for backing off from transmitting on the resources reserved by the resource reservation is configured to: refrain from transmitting the transmission on the resources reserved by the resource reservation for at least the duration of a backoff timer; and transmit another resource reservation for the transmission to the at least one receiving device after the duration of the backoff timer.

[0155] The aforementioned means may be one or more of the aforementioned components in the device 1102 configured to perform the functions recited by the aforementioned means. As described above, the device 1102 may include the TX processor 368, the RX processor 356, and the controller / processor 359. Thus, in one configuration, the aforementioned means may be the TX processor 368, the RX processor 356, and the controller / processor 359 configured to perform the functions recited by the aforementioned means.

[0156] It should be understood that the specific order or hierarchy of each box in the disclosed process / flowchart is an illustration of an example approach. It should be understood that the specific order or hierarchy of each box in these process / flowcharts can be rearranged based on design preferences. In addition, some boxes can be combined or omitted. The attached method claims present the elements of various boxes in an exemplary order and are not meant to be limited to the specific order or hierarchy presented.

[0157] The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be easily understood by those skilled in the art, and the universal principles defined in this article can be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown in this article, but should be granted the full scope consistent with the claims in language, wherein the singular reference of the elements is not intended to represent "there is and only one", but "one or more", unless otherwise stated. Terms such as "if", "when..." and "when..." should be interpreted as meaning "under the condition", rather than implying a direct time relationship or reaction. That is, these phrases (e.g., "when...") do not imply an immediate action in response to the occurrence of an action or during the occurrence of an action, but only imply that an action will occur when the condition is met, and no specific or immediate time constraints are required for the action to occur. The wording "exemplary" is used in this article to represent "used as an example, instance, or explanation". Any aspect described as "exemplary" herein need not be interpreted as being superior to or superior to other aspects. Unless otherwise stated, the term "some / certain" refers to one or more. Combinations such as "at least one of A, B, or C," "one or more of A, B, or C," "at least one of A, B and C," "one or more of A, B, and C," and "A, B, C, or any combination thereof" include any combination of A, B, and / or C, and may include multiple A, multiple B, or multiple C. Specifically, combinations such as "at least one of A, B, or C," "one or more of A, B, or C," "at least one of A, B, and C," "one or more of A, B, and C," and "A, B, C, or any combination thereof" may be only A, only B, only C, A and B, A and C, B and C, or A and B and C, wherein any such combination may include one or more members of A, B, or C. All structural and functional equivalents to the elements of the various aspects described throughout the disclosure that are currently or later 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. The terms "module," "mechanism," "element," "device," etc. may not be a substitute for the term "means." Thus, no claim element should be construed as a means-plus-function unless the element is explicitly recited using the phrase "means for..."

[0158] The following examples are merely illustrative and may be combined with aspects of other embodiments or teachings described herein without limitation.

[0159] Example 1 is a receiving device configured to identify a conflict between a first resource reserved by a first transmitting device and a second resource reserved by a second transmitting device; and transmit a conflict indication to the first transmitting device or the second transmitting device based on the identified conflict.

[0160] Example 2 is the receiving device of Example 1, and the identification of the conflict is based on an overlap between the first resource and the second resource.

[0161] Example 3 is the receiving device of Example 2, and the identification of the conflict is further based on a difference in measured RSRP of a first signal indicating first resources reserved by the first transmitting device and a second signal indicating second resources reserved by the second transmitting device.

[0162] Example 4 is the receiving device of any of Examples 2-3, and the identification of the conflict is further based on a distance between the receiving device and the first transmitting device and the second transmitting device or between the first transmitting device and the second transmitting device.

[0163] Example 5 is a receiving device of any one of Examples 1-4, and the receiving device is further configured to receive a first resource reservation from a first transmitting device; and receive a second resource reservation from a second transmitting device after receiving the first resource reservation, and a conflict indication is transmitted to the second transmitting device based on the second resource reservation being received after the first resource reservation.

[0164] Example 6 is a receiving device of any one of Examples 1-4, and the receiving device is further configured to receive a first resource reservation from a first transmitting device simultaneously with receiving a second resource reservation from a second transmitting device; and determine whether to transmit a conflict indication to the first transmitting device or the second transmitting device based at least in part on a first communication priority associated with the first transmitting device and a second communication priority associated with the second transmitting device.

[0165] Example 7 is a receiving device of any one of Examples 1-4, and the receiving device is further configured to receive a first resource reservation from a first transmitting device simultaneously with receiving a second resource reservation from a second transmitting device, and the first transmitting device and the second transmitting device have the same priority; and determine to transmit a conflict indication to the first transmitting device or the second transmitting device based at least in part on the starting resource block of the first resource and the starting RB of the second resource.

[0166] Example 8 is a receiving device of any one of Examples 1-4, and the receiving device is further configured to receive a first resource reservation from a first transmitting device simultaneously with receiving a second resource reservation from a second transmitting device, and the first transmitting device and the second transmitting device have the same priority; and determine to transmit a conflict indication to the first transmitting device or the second transmitting device based at least in part on the end resource block of the first resource and the end RB of the second resource.

[0167] Example 9 is a receiving device of any one of Examples 1-4, and the receiving device is further configured to receive a first resource reservation from a first transmitting device simultaneously with receiving a second resource reservation from a second transmitting device, and the first transmitting device and the second transmitting device have the same priority and the same resource allocation; and determine whether to transmit a conflict indication to the first transmitting device or the second transmitting device based at least in part on the first device ID of the first transmitting device and the second device ID of the second transmitting device.

[0168] Example 10 is a receiving device of any one of Examples 1-4, and the receiving device is further configured to receive a first resource reservation from a first transmitting device simultaneously with receiving a second resource reservation from a second transmitting device, and the first transmitting device and the second transmitting device have the same priority, the same resource allocation, and are associated with the same set of bits for the device ID; and randomly determine to transmit the conflict indication to the first transmitting device or the second transmitting device.

[0169] Example 11 is the receiving device of any of Examples 1-10, and the conflict indication is transmitted by the first transmitting device or the second transmitting device on resources reserved for the conflict indication.

[0170] Example 12 is a receiving device of any one of Examples 1-10, and the receiving device is further configured to receive a first resource reservation with an associated first conflict indication resource from a first transmitting device; and receive a second resource reservation with a second conflict indication resource from a second transmitting device after receiving the first resource reservation, and the conflict indication is transmitted using the associated first conflict indication resource or the associated second conflict indication resource.

[0171] Example 13 is the receiving device of any one of Examples 1-10, and the conflict indication is transmitted on a feedback channel.

[0172] Example 14 is the receiving device of any of Examples 1-10, and the conflict indication includes a feedback sequence for a non-CTS indication.

[0173] Example 15 is a transmitting device configured to transmit a resource reservation for transmission from a transmitting device to at least one receiving device; receive a conflict indication from a receiving device among the at least one receiving device regarding a conflict between resources reserved by the resource reservation and resources reserved by another transmitting device; and back off from transmitting on the resources reserved by the resource reservation in response to receiving the conflict indication from the receiving device.

[0174] Example 16 is the transmitting device of Example 15, and the conflict indication is received on a conflict indication resource reserved for the conflict indication.

[0175] Example 17 is the transmitting device of Example 16, and the resource reservation includes a conflict indication resource.

[0176] Example 18 is the transmitting device of Example 15, and the conflict indication is received on a feedback channel.

[0177] Example 19 is the transmitting device of any one of Examples 15-18, and the conflict indication includes a feedback sequence for a non-CTS indication.

[0178] Example 20 is a transmitting device of any one of Examples 15-19, and backing off to not transmit on the resources reserved by the resource reservation includes: suppressing transmission of the transmission on the resources reserved by the resource reservation for at least the duration of a backoff timer; and transmitting another resource reservation for the transmission from the transmitting device to the at least one receiving device after the duration of the backoff timer.

Claims

1. A method for wireless communication at a receiving device, comprising: receiving a first resource reservation from a first transmitting device; receiving a second resource reservation from a second transmitting device; identifying a conflict between a first resource reserved by the first transmitting device and a second resource reserved by the second transmitting device based on the received first resource reservation and the received second resource reservation; as well as A conflict indication is transmitted to the first transmitting device or the second transmitting device based on the identified conflict.

2. The method of claim 1, wherein: The identification of the conflict is based on an overlap between the first resource and the second resource.

3. The method of claim 2, wherein: The identification of the conflict is further based on a difference in measured reference signal received power (RSRP) of a first signal indicating the first resource reserved by the first transmitting device and a second signal indicating the second resource reserved by the second transmitting device.

4. The method of claim 2, wherein: The identification of the conflict is further based on a distance between the recipient device and the first transmitting device and the second transmitting device or between the first transmitting device and the second transmitting device.

5. The method of claim 1, wherein the second resource reservation is received after receiving the first resource reservation, Wherein the conflict indication is transmitted to the second transmitting device based on the second resource reservation being received after the first resource reservation.

6. The method according to claim 1, Wherein transmitting the conflict indication comprises: The conflict indication is transmitted to the first transmitting device or the second transmitting device based at least in part on a first communication priority associated with the first transmitting device and a second communication priority associated with the second transmitting device.

7. The method of claim 1, further comprising: receiving a first resource reservation from the first transmitter device simultaneously with receiving a second resource reservation from the second transmitter device, wherein the first transmitter device and the second transmitter device have the same priority; as well as A determination is made based at least in part on a starting resource block of the first resource and a starting RB of the second resource to transmit the conflict indication to the first transmitting device or the second transmitting device.

8. The method of claim 1, further comprising: receiving a first resource reservation from the first transmitter device simultaneously with receiving a second resource reservation from the second transmitter device, wherein the first transmitter device and the second transmitter device have the same priority; as well as A determination to transmit the conflict indication to the first transmitting device or the second transmitting device is based at least in part on an ending resource block of the first resource and an ending RB of the second resource.

9. The method of claim 1, further comprising: receiving a first resource reservation from the first transmitter device simultaneously with receiving a second resource reservation from the second transmitter device, wherein the first transmitter device and the second transmitter device have the same priority and the same resource allocation; as well as A determination is made to transmit the conflict indication to the first transmitting device or the second transmitting device based at least in part on a first device identifier (ID) of the first transmitting device and a second device ID of the second transmitting device.

10. The method of claim 1, further comprising: receiving a first resource reservation from the first transmitter device simultaneously with receiving a second resource reservation from the second transmitter device, wherein the first transmitter device and the second transmitter device have the same priority, the same resource allocation, and are associated with the same set of bits for a device identifier (ID); as well as It is randomly determined whether to transmit the conflict indication to the first transmitting device or the second transmitting device.

11. The method of claim 1, wherein: The conflict indication is transmitted by the first transmitting device or the second transmitting device on resources reserved for the conflict indication.

12. The method of claim 11, further comprising: receiving, from the first transmitting device, a first resource reservation having an associated first conflict indication resource; as well as receiving a second resource reservation having a second conflict indication resource from the second transmitting device after receiving the first resource reservation, The conflict indication is transmitted using the associated first conflict indication resource or the associated second conflict indication resource.

13. The method of claim 1, wherein: The conflict indication is transmitted on a feedback channel.

14. The method of claim 13, wherein: The conflict indication includes a feedback sequence for a non-clear send (non-CTS) indication.

15. The method of claim 1, wherein: The receiving device, the first transmitting device, and the second transmitting device each comprise a user equipment (UE), and wherein the conflict indication is transmitted in a sidelink communication.

16. The method of claim 1, wherein: The first resource reservation is received on a resource different from the first resource.

17. The method of claim 1 or 16, wherein: The second resource reservation is received on a resource different from the second resource.

18. A method for wireless communication at a transmitting device, comprising: transmitting, from the transmitting device to at least one receiving device, a resource reservation for transmission; receiving, from a recipient device of the at least one recipient device, a conflict indication regarding a conflict between resources reserved by the resource reservation and resources reserved by another transmitting device; as well as Backing off from transmitting on resources reserved by the resource reservation in response to receiving the conflict indication from the recipient device.

19. The method of claim 18, wherein: The contention indication is received on contention indication resources reserved for the contention indication.

20. The method of claim 19, wherein: The resource reservation includes the conflict indication resource.

21. The method of claim 18, wherein: The conflict indication is received on a feedback channel.

22. The method of claim 21, wherein: The conflict indication includes a feedback sequence for a non-clear send (non-CTS) indication.

23. The method of claim 18, wherein: Backing off from transmitting on resources reserved by the resource reservation comprises: refraining from transmitting the transmission on the resources reserved by the resource reservation for at least the duration of a backoff timer; and Another resource reservation for the transmission is transmitted from the transmitting device to the at least one receiving device after the duration of the backoff timer.

24. An apparatus for wireless communication by a receiving device, comprising: Memory; as well as at least one processor coupled to the memory and configured to: receiving a first resource reservation from a first transmitting device; receiving a second resource reservation from a second transmitting device; identifying a conflict between a first resource reserved by the first transmitting device and a second resource reserved by the second transmitting device based on the received first resource reservation and the received second resource reservation; as well as A conflict indication is transmitted to the first transmitting device or the second transmitting device based on the identified conflict.

25. The device of claim 24, wherein: The identification of the conflict is based on an overlap between the first resource and the second resource.

26. The device of claim 25, wherein: The identification of the conflict is further based on a difference in measured reference signal received power (RSRP) of a first signal indicating the first resource reserved by the first transmitting device and a second signal indicating the second resource reserved by the second transmitting device.

27. The apparatus of claim 25, wherein: The identification of the conflict is further based on a distance between the recipient device and the first transmitting device and the second transmitting device or between the first transmitting device and the second transmitting device.

28. The apparatus of claim 24, wherein the conflict indication is transmitted by the first transmitting device or the second transmitting device on resources reserved for the conflict indication.

29. The apparatus of claim 24, wherein: The conflict indication is transmitted on a feedback channel, and the conflict indication includes a feedback sequence for a non-clear send (non-CTS) indication.

30. An apparatus for wireless communication by a transmitting device, comprising: Memory; as well as at least one processor coupled to the memory and configured to: transmitting, from the transmitting device to at least one receiving device, a resource reservation for transmission; receiving, from a recipient device of the at least one recipient device, a conflict indication regarding a conflict between resources reserved by the resource reservation and resources reserved by another transmitting device; as well as Backing off from transmitting on resources reserved by the resource reservation in response to receiving the conflict indication from the recipient device.

31. The device of claim 30, wherein: The contention indication is received on contention indication resources reserved for the contention indication.

32. The apparatus of claim 31, wherein: The resource reservation includes the conflict indication resource.

33. The apparatus of claim 30, wherein: The conflict indication is received on a feedback channel.

Images