Method and apparatus for a distributed channel access mechanism using multi-access signatures for control transmissions

Abstract

Aspects of the present disclosure relate to a distributed channel access mechanism using multiple access (MA) signatures for control transmissions. In one aspect, a transmitting device determines an MA signature for distinguishing a transmission of the transmitting device from another transmission of another transmitting device on the same frequency resources; transmits sidelink control information using the MA signature on a first set of frequency resources, the sidelink control information corresponding to first data information; transmits the first data information on the first set of frequency resources; and receives a response from a receiving device indicating whether reception of the first data information was successful. Other aspects, embodiments, and features are also claimed and described.

Description

[0001] Priority claim

[0002] This application claims priority to and the benefit of Non-Provisional Patent Application No. 16 / 525,180 filed in the U.S. Patent and Trademark Office on July 29, 2019, and Provisional Patent Application No. 62 / 717,364 filed in the U.S. Patent and Trademark Office on August 10, 2018, the entire contents of which are incorporated herein by reference as if fully set forth below and for all applicable purposes. Technical Field

[0003] The technology discussed below relates generally to wireless communication systems, and more particularly to a channel access mechanism using multiple access (MA) signatures for control transmissions. Background Art

[0004] The 3rd Generation Partnership Project (3GPP) New Radio (NR) specification (commonly referred to as 5G) supports downlink transmissions from multiple transmission points (TRPs). In a multi-TRP transmission scheme, multiple TRPs may or may not be co-located (e.g., within the same cellular cell). In addition, the multiple TRPs may transmit data to the same UE. The data sent from the multiple TRPs to the same UE may be the same data or different data. When different data is transmitted from the multiple TRPs, higher throughput can be achieved. When the same data (which has potentially different redundant versions) is transmitted from the multiple TRPs, transmission reliability can be improved.

[0005] Cellular vehicle-to-everything (V2X) is a vehicle-to-vehicle communication system that enables communication between a vehicle and any entity that may affect the vehicle. V2X can be subsumed into other more specific communication types, such as vehicle-to-infrastructure (V2I), vehicle-to-vehicle (V2V), vehicle-to-pedestrian (V2P), vehicle-to-device (V2D), and vehicle-to-grid (V2G).

[0006] In 3GPP Release 14, LTE-based communications have been defined for direct interfaces (e.g., PC5 interfaces) as well as network interfaces (e.g., Uu interfaces). Currently, V2V communications via the PC5 interface are broadcast. However, for later 3GPP releases (e.g., Release 16 and higher), it is necessary to establish unicast links between vehicles for advanced use cases. Use cases for 1-to-1 or 1-to-many V2V link scenarios may involve on-demand sharing of sensor data that cannot be supported by broadcast. Another use case may involve a perspective camera feed, such as when a first vehicle wants to use the camera of a second vehicle ahead of the first vehicle to see in front of the second vehicle.

[0007] As the demand for mobile broadband access continues to grow, research and development continues to advance wireless communication technologies to not only meet the growing demand for mobile broadband access, but also to improve and enhance the user experience with mobile communications. Summary of the invention

[0008] A brief summary of one or more aspects of the present disclosure is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived features of the present disclosure, and is neither intended to identify the key or decisive elements of all aspects of the present disclosure nor to attempt to define the scope of any or all aspects of the present disclosure. Its sole purpose is to present some concepts of one or more aspects of the present disclosure in a simplified form as a prelude to a more detailed description that will be given later.

[0009] Various aspects of the present disclosure relate to a distributed channel access mechanism using multiple access (MA) signatures for control transmissions. In one aspect, a transmitting device determines an MA signature for distinguishing a transmission of the transmitting device from another transmission of another transmitting device on the same frequency resources; transmits sidelink control information using the MA signature on a first set of frequency resources, the sidelink control information corresponding to first data information; transmits the first data information on the first set of frequency resources; and receives a response from a receiving device indicating whether reception of the first data information was successful. In another aspect, a receiving device receives one or more sidelink control information from one or more transmitting devices on a first set of frequency resources; detects a multiple access (MA) signature used to transmit the corresponding sidelink control information from a transmitting device of the one or more transmitting devices, wherein the MA signature distinguishes the transmission of the transmitting device from another transmission of another transmitting device of the one or more transmitting devices on the same frequency resources; determines a signal to interference plus noise ratio (SINR) of first data information associated with the corresponding sidelink control information for the detected MA signature; determines the likelihood of successfully receiving the first data information based on the determined SINR; and transmits a response to the transmitting device based on the likelihood, wherein the response indicates whether the reception of the first data information is successful. Other aspects, embodiments, and features are also claimed and described.

[0010] In one example, a method for channel access at a transmitting device is disclosed. The method includes: determining a multiple access (MA) signature for distinguishing a transmission of the transmitting device from another transmission of another transmitting device on the same frequency resource; using the MA signature to transmit side link control information on a first frequency resource set, the side link control information corresponding to first data information; transmitting the first data information on the first frequency resource set; receiving a response from a receiving device indicating whether reception of the first data information is successful; determining second data information and a second frequency resource set based on the response received from the receiving device; and transmitting the second data information on the second frequency resource set.

[0011] In another example, a transmitting device for channel access is disclosed. The transmitting device includes: a device for determining a multiple access (MA) signature for distinguishing a transmission of the transmitting device from another transmission of another transmitting device on the same frequency resource; a device for transmitting side link control information using the MA signature on a first frequency resource set, the side link control information corresponding to a first data information; a device for transmitting the first data information on the first frequency resource set; a device for receiving a response from a receiving device indicating whether the reception of the first data information is successful; a device for determining second data information and a second frequency resource set based on the response received from the receiving device; and a device for transmitting the second data information on the second frequency resource set.

[0012] In a further example, a transmitting device for channel access is disclosed. The transmitting device includes a processor, a transceiver communicatively coupled to at least one processor, and a memory communicatively coupled to the at least one processor. The at least one processor is configured to: determine a multiple access (MA) signature for distinguishing a transmission of the transmitting device from another transmission of another transmitting device on the same frequency resource; use the MA signature to transmit side link control information on a first frequency resource set, the side link control information corresponding to a first data information; transmit the first data information on the first frequency resource set; receive a response from a receiving device indicating whether the reception of the first data information is successful; determine the second data information and the second frequency resource set based on the response received from the receiving device; and transmit the second data information on the second frequency resource set.

[0013] In yet another example, a non-transitory computer-readable medium storing computer executable code for channel access at a transmitting device is disclosed. The non-transitory computer-readable medium includes code for causing a computer to perform the following operations: determining a multiple access (MA) signature for distinguishing a transmission of the transmitting device from another transmission of another transmitting device on the same frequency resource; using the MA signature to transmit side link control information on a first frequency resource set, the side link control information corresponding to a first data information; transmitting the first data information on the first frequency resource set; receiving a response from a receiving device indicating whether the reception of the first data information is successful; determining second data information and a second frequency resource set based on the response received from the receiving device; and transmitting the second data information on the second frequency resource set.

[0014] In one example, a method for channel access at a receiving device is disclosed. The method includes: receiving one or more side link control information from one or more transmitting devices on a first frequency resource set; detecting a multiple access (MA) signature used to transmit the corresponding side link control information from one of the one or more transmitting devices, wherein the MA signature distinguishes the transmission of the transmitting device from another transmission of another transmitting device of the one or more transmitting devices on the same frequency resource; determining a signal to interference plus noise ratio (SINR) of a first data information associated with the corresponding side link control information for the detected MA signature; determining the likelihood of successfully receiving the first data information based on the determined SINR; receiving or attempting to receive the first data information on the first frequency resource set; transmitting a response to the transmitting device based on the likelihood, wherein the response indicates whether the reception of the first data information is successful; and receiving the second data information on the second frequency resource set.

[0015] In another example, a receiving device for channel access is disclosed. The receiving device includes: a device for receiving one or more side link control information from one or more transmitting devices on a first frequency resource set; a device for detecting a multiple access (MA) signature used to transmit the corresponding side link control information from one of the one or more transmitting devices, wherein the MA signature distinguishes the transmission of the transmitting device from another transmission of another transmitting device of the one or more transmitting devices on the same frequency resource; a device for determining a signal to interference plus noise ratio (SINR) of a first data information associated with the corresponding side link control information for the detected MA signature; a device for determining the likelihood of successfully receiving the first data information based on the determined SINR; a device for receiving or attempting to receive the first data information on the first frequency resource set; a device for transmitting a response to the transmitting device based on the likelihood, wherein the response indicates whether the reception of the first data information is successful; and a device for receiving the second data information on a second frequency resource set.

[0016] In a further example, a receiving device for channel access is disclosed. The receiving device includes a processor, a transceiver communicatively coupled to at least one processor, and a memory communicatively coupled to the at least one processor. The at least one processor is configured to: receive one or more side link control information from one or more transmitting devices on a first frequency resource set; detect a multiple access (MA) signature used to transmit the corresponding side link control information from one of the one or more transmitting devices, wherein the MA signature distinguishes the transmission of the transmitting device from another transmission of another transmitting device of the one or more transmitting devices on the same frequency resource; determine a signal to interference plus noise ratio (SINR) of a first data information associated with the corresponding side link control information for the detected MA signature; determine the likelihood of successfully receiving the first data information based on the determined SINR; receive or attempt to receive the first data information on the first frequency resource set; transmit a response to the transmitting device based on the likelihood, wherein the response indicates whether the reception of the first data information is successful; and receive the second data information on the second frequency resource set.

[0017] In yet another example, a non-transitory computer-readable medium storing computer executable code for channel access at a receiving device is disclosed. The non-transitory computer-readable medium includes code for causing a computer to perform the following operations: receiving one or more side link control information from one or more transmitting devices on a first frequency resource set; detecting a multiple access (MA) signature used to transmit the corresponding side link control information from one of the one or more transmitting devices, wherein the MA signature distinguishes the transmission of the transmitting device from another transmission of another transmitting device of the one or more transmitting devices on the same frequency resource; determining a signal to interference plus noise ratio (SINR) of a first data information associated with the corresponding side link control information for the detected MA signature; determining the likelihood of successfully receiving the first data information based on the determined SINR; receiving or attempting to receive the first data information on the first frequency resource set; transmitting a response to the transmitting device based on the likelihood, wherein the response indicates whether the reception of the first data information is successful; and receiving the second data information on the second frequency resource set.

[0018] These and other aspects of the present invention will be more fully understood after reading the following detailed description. After reading the following description of specific exemplary embodiments of the present invention in conjunction with the accompanying drawings, other aspects, features and embodiments of the present invention will be apparent to those of ordinary skill in the art. Although features of the present invention may be discussed below with respect to certain embodiments and drawings, all embodiments of the present invention may include one or more advantageous features discussed herein. In other words, although one or more embodiments may be discussed as having certain advantageous features, one or more such features may also be used according to the various embodiments of the present invention discussed herein. In a similar manner, although exemplary embodiments may be discussed below as device, system or method embodiments, it should be appreciated that such exemplary embodiments may be implemented in various devices, systems, and methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic illustration of a wireless communication system.

[0020] Figure 2 is a conceptual illustration of an example of a radio access network.

[0021] Figure 3 is a schematic illustration of the organization of radio resources in an air interface utilizing Orthogonal Frequency Division Multiplexing (OFDM).

[0022] Figure 4 is a schematic illustration of an OFDM air interface utilizing scalable parameter sets in accordance with some aspects of the present disclosure.

[0023] Figure 5A transmission time interval (TTI) structure for a listen-before-talk (LBT) based channel access mechanism is explained.

[0024] Figure 6 The use of channel bandwidth for channel access mechanisms is illustrated.

[0025] Figure 7 A V2X scenario is illustrated where the transmission to the receiver is not power controlled.

[0026] Figure 8 An example TTI structure for REQ-RSP based channel access design according to an aspect of the present disclosure is illustrated.

[0027] Fig. 9 An example resource structure for control symbols having reference symbols (RS) according to an aspect of the present disclosure is illustrated.

[0028] Fig.10 An example TTI structure for REQ-RSP based channel access design according to an aspect of the present disclosure is illustrated.

[0029] Fig.11 is a block diagram illustrating an example of a hardware implementation for user equipment according to some aspects of the present disclosure.

[0030] Fig.12 is a flow chart illustrating an exemplary process for channel access at a transmitting device according to some aspects of the present disclosure.

[0031] Fig.13 is a flow chart illustrating an exemplary process for channel access at a recipient device in accordance with some aspects of the present disclosure. DETAILED DESCRIPTION

[0032] 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.

[0033] Although various aspects and embodiments are described in this application by explanation of some examples, it will be understood by those skilled in the art that additional implementations and use cases can be generated in many different arrangements and scenarios. The innovation described herein can be implemented across many different platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, each embodiment and / or use can be generated via an integrated chip embodiment and other devices based on non-module components (e.g., end-user devices, vehicles, communication equipment, computing equipment, industrial equipment, retail / shopping equipment, medical equipment, AI-enabled devices, etc.). Although some examples may or may not be specifically for each use case or application, the wide applicability of the described innovation may occur. The scope of each implementation can range from chip-level or module components to non-module, non-chip-level implementations, and further to aggregated, distributed or OEM devices or systems incorporating one or more aspects of the described innovation. In some actual settings, the equipment incorporating the various aspects and features described may also necessarily include additional components and features for implementing and practicing the claimed and described embodiments. For example, the transmission and reception of wireless signals necessarily include several components for analog and digital purposes (e.g., hardware components, including antennas, RF chains, power amplifiers, modulators, buffers, processors, interleavers, adders / summers, etc.). The innovations described herein are intended to be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, end-user devices, etc., of various sizes, shapes, and configurations.

[0034] Aspects of the present disclosure relate to a distributed channel access mechanism using multiple access (MA) signatures for control transmissions.

[0035] The various concepts presented throughout this disclosure may be implemented across a wide variety of telecommunication systems, network architectures, and communication standards. Figure 1 , various aspects of the present disclosure are explained with reference to a wireless communication system 100, by way of illustrative example and not limitation. The wireless communication system 100 includes three interacting domains: a core network 102, a radio access network (RAN) 104, and a user equipment (UE) 106. The wireless communication system 100 enables the UE 106 to perform data communications with an external data network 110, such as (but not limited to) the Internet.

[0036] The RAN 104 may implement any suitable one or more wireless communication technologies to provide radio access to the UE 106. As an example, the RAN 104 may operate in accordance with the 3rd Generation Partnership Project (3GPP) New Radio (NR) specification, commonly referred to as 5G. As another example, the RAN 104 may operate under a mix of 5GNR and Evolved Universal Terrestrial Radio Access Network (eUTRAN) standards, commonly referred to as LTE. 3GPP refers to this hybrid RAN as the Next Generation RAN, or NG-RAN. Of course, many other examples may be utilized within the scope of the present disclosure.

[0037] As illustrated, the RAN 104 includes a plurality of base stations 108. In a broad sense, a base station is a network element in a radio access network that is responsible for radio transmission and reception to or from a UE in one or more cells. In different technologies, standards, or contexts, a base station may be referred to differently by those skilled in the art as a base transceiver station (BTS), a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), an access point (AP), a Node B (NB), an evolved Node B (eNB), a g Node B (gNB), or some other suitable terminology.

[0038] The radio access network 104 is further illustrated as supporting wireless communications for multiple mobile devices. A mobile device may be referred to as a user equipment (UE) in the 3GPP standard, but may also be referred to as a mobile station (MS), 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 (AT), a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, or some other suitable terminology by those skilled in the art. A UE may be a device that provides a user with access to network services.

[0039] Within this document, a "mobile" device does not necessarily need to have mobile capabilities, and may be stationary. The term mobile device or mobile equipment refers broadly to a wide variety of devices and technologies. A UE may include several hardware structural components sized, shaped, and arranged to facilitate communication; such components may include antennas, antenna arrays, RF chains, amplifiers, one or more processors, and the like electrically coupled to each other. For example, some non-limiting examples of mobile devices include mobile devices, cellular (cell) phones, smart phones, Session Initiation Protocol (SIP) phones, laptops, personal computers (PCs), notebooks, netbooks, smartbooks, tablet devices, personal digital assistants (PDAs), and a wide variety of embedded systems, for example, corresponding to the "Internet of Things" (IoT). Additionally, the mobile device may be a car or other transportation vehicle, a remote sensor or actuator, a robot or robotic device, a satellite radio, a global positioning system (GPS) device, an object tracking device, a drone, a multicopter, a quadcopter, a remote control device, a consumer and / or wearable device (such as glasses), a wearable camera, a virtual reality device, a smart watch, a health or fitness tracker, a digital audio player (e.g., an MP3 player), a camera, a game console, etc. The mobile device may also be a digital home or smart home device, such as home audio, video and / or multimedia equipment, an appliance, a vending machine, a smart lighting device, a home security system, a smart meter, etc. The mobile device may also be a smart energy device, a security device, a solar panel or solar array, a municipal infrastructure device that controls power, lighting, water, etc. (e.g., a smart grid); industrial automation and enterprise equipment; logistics controllers; agricultural equipment; military defense equipment, vehicles, aircraft, ships and weapons, etc. Still further, the mobile device may provide networked medical or telemedicine support, such as health care at a distance. Telehealth devices may include telehealth monitoring devices and telehealth supervisory devices, whose communications may be given priority or prioritized access over other types of information, for example, in the form of prioritized access for critical service data transmission and / or associated QoS for critical service data transmission.

[0040] Wireless communication between RAN 104 and UE 106 may be described as utilizing an air interface. Transmissions over the air interface from a base station (e.g., base station 108) to one or more UEs (e.g., UE 106) may be referred to as downlink (DL) transmissions. According to certain aspects of the present disclosure, the term downlink may refer to a point-to-multipoint transmission originating at a scheduling entity (further described below; e.g., base station 108). Another way to describe this scheme may be to use the term broadcast channel multiplexing. Transmissions from a UE (e.g., UE 106) to a base station (e.g., base station 108) may be referred to as uplink (UL) transmissions. According to further aspects of the present disclosure, the term uplink may refer to a point-to-point transmission originating at a scheduled entity (further described below; e.g., UE 106).

[0041] In some examples, access to the air interface may be scheduled, wherein a scheduling entity (e.g., a base station 108) allocates resources for communication among some or all devices and equipment within its service area or cell. Within the present disclosure, as discussed further below, a scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more scheduled entities. That is, for scheduled communications, a UE 106 (which may be a scheduled entity) may utilize resources allocated by the scheduling entity 108.

[0042] Base station 108 is not the only entity that may function as a scheduling entity. That is, in some examples, a UE may function as a scheduling entity, scheduling resources for one or more scheduled entities (eg, one or more other UEs).

[0043] like Figure 1 , the scheduling entity 108 may broadcast downlink traffic 112 to one or more scheduled entities 106. Broadly speaking, the scheduling entity 108 is a node or device responsible for scheduling traffic in the wireless communication network, including downlink traffic 112 and, in some examples, uplink traffic 116 from one or more scheduled entities 106 to the scheduling entity 108. On the other hand, the scheduled entity 106 is a node or device that receives downlink control information 114 (including but not limited to scheduling information (e.g., grants), synchronization or timing information), or other control information from another entity in the wireless communication network, such as the scheduling entity 108.

[0044] In general, the base stations 108 may include a backhaul interface for communicating with a backhaul portion 120 of the wireless communication system. The backhaul 120 may provide a link between the base stations 108 and the core network 102. Furthermore, in some examples, the backhaul network may provide interconnections between the respective base stations 108. Various types of backhaul interfaces may be employed, such as a direct physical connection using any suitable transport network, a virtual network, and the like.

[0045] The core network 102 may be part of the wireless communication system 100 and may be independent of the radio access technology used in the RAN 104. In some examples, the core network 102 may be configured according to a 5G standard (e.g., 5GC). In other examples, the core network 102 may be configured according to a 4G Evolved Packet Core (EPC), or any other suitable standard or configuration.

[0046] Now refer to Figure 2 , a schematic illustration of RAN 200 is provided by way of example and not limitation. In some examples, RAN 200 may be similar to that described above and in Figure 1 The geographic area covered by the RAN 200 may be divided into cellular areas (cells) that may be uniquely identified by user equipment (UE) based on an identity broadcast from an access point or base station. Figure 2 Macro cells 202, 204, and 206, and small cells 208 are illustrated, each of which may include one or more sectors (not shown). A sector is a sub-area of ​​a cell. All sectors within one cell are served by the same base station. A radio link within a sector may be identified by a single logical identification belonging to the sector. In a cell divided into sectors, multiple sectors within a cell may be formed by antenna groups, where each antenna is responsible for communication with UEs in a portion of the cell.

[0047] exist Figure 2 , two base stations 210 and 212 are shown in the cellular cells 202 and 204; and a third base station 214 is shown as controlling a remote radio head (RRH) 216 in the cellular cell 206. That is, the base station may have an integrated antenna, or may be connected to the antenna or RRH by a feeder cable. In the illustrated example, the cellular cells 202, 204, and 206 may be referred to as macro cells because the base stations 210, 212, and 214 support cellular cells with large sizes. In addition, the base station 218 is shown in a small cell 208 (e.g., a micro cell, a micro cell, a femto cell, a home base station, a home node B, a home evolved node B, etc.), which may overlap with one or more macro cells. In this example, the cellular cell 208 may be referred to as a small cell because the base station 218 supports a cellular cell with a relatively small size. The cellular cell size setting may be completed according to the system design and component constraints.

[0048] It is to be understood that the radio access network 200 may include any number of wireless base stations and cellular cells. In addition, relay nodes may be deployed to extend the size or coverage area of ​​a given cellular cell. Base stations 210, 212, 214, 218 provide wireless access points to the core network for any number of mobile devices. In some examples, base stations 210, 212, 214, and / or 218 may be similar to those described above and in Figure 1 The same as the base station / scheduling entity 108 illustrated in FIG.

[0049] Figure 2 Further included is a quadcopter or drone 220 that can be configured to act as a base station. That is, in some examples, the cell may not necessarily be stationary, and the geographic area of ​​the cell may move depending on the location of a mobile base station (such as a quadcopter 220).

[0050] Within the RAN 200, cells may include UEs that may be in communication with one or more sectors of each cell. In addition, each base station 210, 212, 214, 218, and 220 may be configured to provide a core network 102 (see FIG. 1 ) for all UEs in the corresponding cell. Figure 1 ) access point. For example, UEs 222 and 224 may be in communication with base station 210; UEs 226 and 228 may be in communication with base station 212; UEs 230 and 232 may be in communication with base station 214 via RRH 216; UE 234 may be in communication with base station 218; and UE 236 may be in communication with mobile base station 220. In some examples, UEs 222, 224, 226, 228, 230, 232, 234, 236, 238, 240, and / or 242 may be in communication with the mobile base station 220 described above and in Figure 1 The UE / scheduled entity 106 is the same as illustrated in FIG.

[0051] In some examples, a mobile network node (eg, quadcopter 220) can be configured to function as a UE. For example, quadcopter 220 can operate within cell 202 by communicating with base station 210.

[0052] In a further aspect of RAN 200, sidelink signals may be used between UEs without having to rely on scheduling or control information from a base station. For example, two or more UEs (e.g., UE 226 and 228) may communicate with each other using peer-to-peer (P2P) or sidelink signals 227 without relaying the communication through a base station (e.g., base station 212). In a further example, UE 238 is illustrated as communicating with UEs 240 and 242. Here, UE 238 may be used as a scheduling entity or a primary sidelink device, and UEs 240 and 242 may be used as scheduled entities or non-primary (e.g., secondary) sidelink devices. In yet another example, a UE may be used as a scheduling entity in a device-to-device (D2D), peer-to-peer (P2P), or vehicle-to-vehicle (V2V) network, and / or a mesh network. In a mesh network example, UEs 240 and 242 may optionally communicate directly with each other in addition to communicating with scheduling entity 238. Thus, in a wireless communication system having scheduled access to time-frequency resources and having a cellular configuration, a P2P configuration, or a mesh configuration, a scheduling entity and one or more scheduled entities may communicate using the scheduled resources.

[0053] In the radio access network 200, the ability of a UE to communicate independently of its location while moving is called mobility. The various physical channels between the UE and the radio access network are generally managed by an access and mobility management function (AMF, not illustrated, Figure 1 The AMF is established, maintained and released under the control of the core network 102 in the core network, which may include a security context management function (SCMF) that manages the security context of both the control plane and the user plane functionalities and a security anchor function (SEAF) that performs authentication.

[0054] In various aspects of the present disclosure, the radio access network 200 may utilize DL-based mobility or UL-based mobility to implement mobility and handover (i.e., the transfer of a UE's connection from one radio channel to another). In a network configured for DL-based mobility, during a call with a scheduling entity, or at any other time, the UE may monitor various parameters of the signal from its serving cell and various parameters of neighboring cells. Depending on the quality of these parameters, the UE may maintain communication with one or more neighboring cells. During this time, if the UE moves from one cell to another, or if the signal quality from a neighboring cell exceeds the signal quality from the serving cell for a given amount of time, the UE may perform a handover or handover from the serving cell to the neighboring (target) cell. For example, a UE 224 (illustrated as a vehicle, but any suitable form of UE may be used) may move from a geographic area corresponding to its serving cell 202 to a geographic area corresponding to a neighboring cell 206. When the signal strength or quality from a neighbor cell 206 exceeds the signal strength or quality of its serving cell 202 for a given amount of time, the UE 224 may transmit a report message indicating this condition to its serving base station 210. In response, the UE 224 may receive a handover command, and the UE may undergo a handover to the cell 206.

[0055] In a network configured for UL-based mobility, the UL reference signal from each UE may be used by the network to select a serving cell for each UE. In some examples, base stations 210, 212, and 214 / 216 may broadcast unified synchronization signals (e.g., unified primary synchronization signal (PSS), unified secondary synchronization signal (SSS), and unified physical broadcast channel (PBCH)). UEs 222, 224, 226, 228, 230, and 232 may receive the unified synchronization signals, derive carrier frequency and slot timing from these synchronization signals, and transmit uplink pilots or reference signals in response to the derived timing. The uplink pilot signal transmitted by a UE (e.g., UE 224) may be received concurrently by two or more cells (e.g., base stations 210 and 214 / 216) within the radio access network 200. Each of these cells may measure the strength of the pilot signal, and the radio access network (e.g., one or more of base stations 210 and 214 / 216 and / or a central node within a core network) may determine a serving cell for UE 224. As UE 224 moves in radio access network 200, the network may continue to monitor uplink pilot signals transmitted by UE 224. When the signal strength or quality of the pilot signal measured by a neighboring cell exceeds the signal strength or quality measured by the serving cell, network 200 may handover UE 224 from the serving cell to the neighboring cell with or without notifying UE 224.

[0056] Although the synchronization signal transmitted by base stations 210, 212 and 214 / 216 may be uniform, the synchronization signal may not identify a specific cell, but may identify a zone including multiple cells operating on the same frequency and / or having the same timing. The use of zones in a 5G network or other next generation communication network implements an uplink-based mobility framework and improves the efficiency of both the UE and the network because the number of mobility messages that need to be exchanged between the UE and the network can be reduced.

[0057] In various implementations, the air interface in the radio access network 200 may utilize a licensed spectrum, an unlicensed spectrum, or a shared spectrum. A licensed spectrum generally provides exclusive use of a portion of the spectrum by a mobile network operator purchasing a license from a government regulator. An unlicensed spectrum provides shared use of a portion of the spectrum without a government-granted license. Although some technical rules generally still need to be followed to access the unlicensed spectrum, any operator or device can obtain access. A shared spectrum may fall between licensed and unlicensed spectrum, where technical rules or restrictions may be required to access the spectrum, but the spectrum may still be shared by multiple operators and / or multiple RATs. For example, a license holder of a portion of a licensed spectrum may provide licensed shared access (LSA) to share the spectrum with other parties, for example, using conditions determined by the appropriate license holder to obtain access.

[0058] The air interface in the radio access network 200 may utilize one or more duplex algorithms. Duplex refers to a point-to-point communication link in which both endpoints can communicate with each other in two directions. Full-duplex means that both endpoints can communicate with each other at the same time. Half-duplex means that only one endpoint can send information to the other endpoint at a time. In a wireless link, a full-duplex channel generally relies on the physical isolation of the transmitter and the receiver, and suitable interference cancellation techniques. Full-duplex simulation is usually implemented for a wireless link by utilizing frequency division duplex (FDD) or time division duplex (TDD). In FDD, transmissions in different directions operate at different carrier frequencies. In TDD, transmissions in different directions on a given channel are separated from each other using time division multiplexing. That is, at some times, the channel is dedicated to transmissions in one direction, and at other times, the channel is dedicated to transmissions in another direction, where the direction can change very quickly, for example, several times per time slot.

[0059] In order to obtain a low block error rate (BLER) for transmissions over the radio access network 200 while still achieving very high data rates, channel coding may be used. That is, wireless communications may generally utilize suitable error-correcting block codes. In a typical block code, an information message or sequence is split into code blocks (CBs), and an encoder (e.g., CODEC) at the transmitting device then mathematically adds redundancy to the information message. Utilizing this redundancy in the encoded information message may improve the reliability of the message, thereby enabling correction of any bit errors that may occur due to noise.

[0060] In earlier 5G NR specifications, user data is encoded using quasi-cyclic low-density parity check (LDPC) with two different basemaps: one basemap is used for large code blocks and / or high code rates, and the other basemap is used for other cases. Control information and the physical broadcast channel (PBCH) are encoded using polar coding based on nested sequences. For these channels, puncturing, shortening, and repetition are used for rate matching.

[0061] However, it will be appreciated by those skilled in the art that aspects of the present disclosure may be implemented using any suitable channel code. Various implementations of the scheduling entity 108 and the scheduled entity 106 may include suitable hardware and capabilities (e.g., encoders, decoders, and / or CODECs) to utilize one or more of these channel codes for wireless communication.

[0062] The air interface in the radio access network 200 may utilize one or more multiplexing and multiple access algorithms to enable simultaneous communication of various devices. For example, the 5G NR specification utilizes orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) to provide multiple access for UL transmissions from UE 222 and 224 to base station 210, and multiplexing for DL ​​transmissions from base station 210 to one or more UEs 222 and 224. In addition, for UL transmissions, the 5G NR specification provides support for discrete Fourier transform spread OFDM (DFT-s-OFDM) with CP (also known as single carrier FDMA (SC-FDMA)). However, within the scope of the present disclosure, multiplexing and multiple access are not limited to the above schemes, and may be provided using time division multiple access (TDMA), code division multiple access (CDMA), frequency division multiple access (FDMA), sparse code multiple access (SCMA), resource extension multiple access (RSMA), or other appropriate multiple access schemes. In addition, multiplexing of DL transmissions from base station 210 to UEs 222 and 224 may be provided using time division multiplexing (TDM), code division multiplexing (CDM), frequency division multiplexing (FDM), orthogonal frequency division multiplexing (OFDM), sparse code multiplexing (SCM), or other suitable multiplexing schemes.

[0063] Will refer to Figure 3 Various aspects of the present disclosure are described with reference to the OFDM waveform schematically illustrated in FIG. It should be understood by those of ordinary skill in the art that various aspects of the present disclosure can be applied to DFT-s-OFDMA waveforms in substantially the same manner as described below. That is, while some examples of the present disclosure may focus on OFDM links for clarity, it should be understood that the same principles can also be applied to DFT-s-OFDMA waveforms.

[0064] In this disclosure, a frame refers to a 10 ms duration used for wireless transmission, where each frame includes 10 subframes of 1 ms each. On a given carrier, there may be one set of frames in the UL and another set of frames in the DL. Now referring to Figure 3, illustrates an expanded view of an exemplary DL subframe 302 showing an OFDM resource grid 304. However, as will be readily appreciated by those skilled in the art, the PHY transmission structure for any particular application may differ from the examples described herein depending on any number of factors. Here, time is in the horizontal direction in units of OFDM symbols; and frequency is in the vertical direction in units of subcarriers or tones.

[0065] Resource grid 304 can be used to schematically represent the time-frequency resources for a given antenna port. That is, in a MIMO implementation with multiple antenna ports available, there may be corresponding multiple resource grids 304 available for communication. Resource grid 304 is divided into multiple resource elements (REs) 306. RE (which is 1 subcarrier × 1 symbol) is the smallest discrete part of the time-frequency grid and contains a single complex value representing data from a physical channel or signal. Depending on the modulation utilized in a particular implementation, each RE may represent one or more information bits. In some examples, a block of REs may be referred to as a physical resource block (PRB) or more simply a resource block (RB) 308, which contains any suitable number of consecutive subcarriers in the frequency domain. In one example, an RB may include 12 subcarriers, which number is independent of the parameter set used. In some examples, depending on the parameter set, an RB may include any suitable number of consecutive OFDM symbols in the time domain. Within the present disclosure, it is assumed that a single RB (such as RB 308) corresponds entirely to a single communication direction (transmission or reception for a given device).

[0066] A UE typically utilizes only a subset of the resource grid 304. An RB may be the smallest resource unit that may be allocated to a UE. Thus, the more RBs are scheduled for a UE and the higher the modulation scheme chosen for the air interface, the higher the data rate for the UE.

[0067] In this illustration, RB 308 is shown as occupying less than the entire bandwidth of subframe 302, with some subcarriers illustrated above and below RB 308. In a given implementation, subframe 302 may have a bandwidth corresponding to any number of one or more RBs 308. Furthermore, in this illustration, RB 308 is shown as occupying less than the entire duration of subframe 302, but this is merely one possible example.

[0068] Each 1 ms subframe 302 may include one or more adjacent time slots. Figure 3In the example shown in , a subframe 302 includes four time slots 310. In some examples, a time slot may be defined according to a specified number of OFDM symbols with a given cyclic prefix (CP) length. For example, a time slot may include 7 or 14 OFDM symbols with a nominal CP. Additional examples may include mini-slots with shorter durations (e.g., one or two OFDM symbols). In some cases, these mini-slots may occupy resources scheduled for ongoing time slot transmissions for the same or different UEs for transmission.

[0069] The expanded view of one slot 310 illustrates the slot 310 including a control region 312 and a data region 314. In general, the control region 312 may carry a control channel (e.g., PDCCH), while the data region 314 may carry a data channel (e.g., PDSCH or PUSCH). Of course, a slot may contain all DL, all UL, or at least one DL portion and at least one UL portion. Figure 3 The simple structure illustrated in is merely exemplary in nature and different slot structures may be utilized and may include one or more of each of the control region and the data region.

[0070] Although not in Figure 3 308, but each RE 306 within the RB 308 may be scheduled to carry one or more physical channels, including a control channel, a shared channel, a data channel, etc. Other REs 306 within the RB 308 may also carry pilot or reference signals, including but not limited to a demodulation reference signal (DMRS), a control reference signal (CRS), or a sounding reference signal (SRS). These pilot or reference signals may be used by a receiving device to perform channel estimation on the corresponding channel, which may enable coherent demodulation / detection of the control and / or data channels within the RB 308.

[0071] In a DL transmission, a transmitting device (e.g., a scheduling entity 108) may allocate one or more REs 306 (e.g., within a control region 312) to carry DL control information 114 to one or more scheduled entities 106, the DL control information 114 including one or more DL control channels, such as PBCH; PSS; SSS; Physical Control Format Indicator Channel (PCFICH); Physical Hybrid Automatic Repeat Request (HARQ) Indicator Channel (PHICH); and / or Physical Downlink Control Channel (PDCCH), etc. The PCFICH provides information to assist a receiving device in receiving and decoding the PDCCH. The PDCCH carries downlink control information (DCI), including, but not limited to, power control commands, scheduling information, grants, and / or assignments of REs for DL ​​and UL transmissions. The PHICH carries HARQ feedback transmissions, such as an acknowledgment (ACK) or a negative acknowledgment (NACK). HARQ is a well-known technology to those skilled in the art, wherein for accuracy, the integrity of packet transmission may be checked at the receiving side using, for example, any suitable integrity check mechanism such as a checksum or a cyclic redundancy check (CRC). If the integrity of the transmission is confirmed, an ACK may be transmitted, and if not, a NACK may be transmitted. In response to a NACK, the transmitting device may send a HARQ retransmission, which may enable catch-up combining, incremental redundancy, and the like.

[0072] In an UL transmission, a transmitting device (e.g., a scheduled entity 106) may utilize one or more REs 306 to carry UL control information 118 to a scheduling entity 108, the UL control information 118 including one or more UL control channels, such as a physical uplink control channel (PUCCH). The UL control information may include various packet types and categories, including pilots, reference signals, and information configured to enable or assist in decoding uplink data transmissions. In some examples, the control information 118 may include a scheduling request (SR), for example, a request for the scheduling entity 108 to schedule an uplink transmission. Here, in response to the SR transmitted on the control channel 118, the scheduling entity 108 may transmit downlink control information 114, which may schedule resources for uplink packet transmissions. The UL control information may also include HARQ feedback, channel state feedback (CSF), or any other suitable UL control information.

[0073] In addition to control information, one or more REs 306 (e.g., within the data region 314) may also be allocated for user data or traffic data. Such traffic may be carried on one or more traffic channels, such as a physical downlink shared channel (PDSCH) for DL ​​transmissions or a physical uplink shared channel (PUSCH) for UL transmissions. In some examples, one or more REs 306 within the data region 314 may be configured to carry a system information block (SIB), which carries information that may enable access to a given cell.

[0074] The above description and Figure 1 and 3 The channels or carriers illustrated in the figure are not necessarily all channels or carriers that can be utilized between the scheduling entity 108 and the scheduled entity 106, and a person of ordinary skill in the art will recognize that other channels or carriers may be utilized in addition to those channels or carriers illustrated, such as other traffic, control, and feedback channels.

[0075] These physical channels are generally multiplexed and mapped to transport channels for handling by the medium access control (MAC) layer. The transport channels carry information blocks, which are called transport blocks (TBs). The transport block size (TBS), which may correspond to the number of information bits, may be a controlled parameter based on the modulation and coding scheme (MCS) and the number of RBs in a given transmission.

[0076] In OFDM, in order to maintain the orthogonality of subcarriers or frequency modulation, the subcarrier spacing may be equal to the inverse of the symbol period. The parameter set of an OFDM waveform refers to its specific subcarrier spacing and cyclic prefix (CP) overhead. The scalable parameter set refers to the ability of the network to select different subcarrier spacings and correspondingly select the corresponding symbol duration (including CP length) for each spacing. With the scalable parameter set, the nominal subcarrier spacing (SCS) can be scaled up or down by integer multiples. In this way, regardless of the CP overhead and the selected SCS, the symbol boundaries can be aligned at certain common multiples of the symbols (for example, aligned at the boundaries of each 1ms subframe). The range of SCS may include any suitable SCS. For example, a scalable parameter set may support an SCS ranging from 15kHz to 480kHz.

[0077] To explain this concept of scalable parameter sets, Figure 4 A first RB 402 having a nominal parameter set and a second RB 404 having a scaled parameter set are shown. As an example, the first RB 402 may have a 'nominal' subcarrier spacing (SCS) of 30 kHz. n ) and a 'nominal' symbol duration of 333 μs nHere, in the second RB 404, the scaled parameter set includes twice the nominal SCS or 2×SCS n =60kHz scaled SCS. Because this provides twice the bandwidth per symbol, this results in a shortened symbol duration to carry the same information. Thus, in the second RB 404, the scaled parameter set includes half of the nominal symbol duration or (symbol duration n )÷2=scaled symbol duration of 167μs.

[0078] In some aspects, the channel access mechanism may be based on a listen-before-talk (LBT) contention based design. Figure 5 A transmission time interval (TTI) structure 500 for a channel access mechanism based on LBT is illustrated, for example, a 0.5 ms TTI with a 30 kHz subcarrier spacing (SCS). The TTI structure 500 may include a first region 502 having a number of LBT symbols for conveying an LBT sequence. The first region 502 is followed by a second region 504 for conveying control information. A third region 506 may include a number of symbols for conveying data. Finally, the third region 506 is followed by a feedback / gap region 508 for conveying feedback transmissions (e.g., related to the previous TTI) and facilitating a transmit / receive (Tx / Rx) turnaround. If TTI bundling is utilized, the LBT symbols in the first region 502 may be apportioned as data. It is noteworthy that some symbols may be susceptible to puncturing if automatic gain control (AGC) retraining is required.

[0079] Figure 6 The use of channel bandwidth 600 for a channel access mechanism is illustrated. In an aspect, the channel bandwidth / resource pool may be divided into sub-channels. For example, one sub-channel may be equal to 5 resource blocks (RBs).

[0080] In one aspect, the transmitting UE may follow an LBT procedure for selecting one or more subchannels. The LBT procedure may include the transmitting UE using a counter to determine the action to be performed based on a counter value (e.g., 0 or 1). The action corresponding to the counter value may be randomly selected or based on a priority. In an example, if the counter = 0, the first UE 602 may transmit an LBT sequence 620 in a subchannel starting from the first symbol in the TTI. After the LBT sequence 620, the first UE 602 may transmit control information 622 and data 624.

[0081] In another example, if the counter = 1, the transmitting UE (e.g., the second UE 604 or the third UE 606) may monitor during the first LBT symbol of the TTI to determine whether one or more subchannels are being used. The transmitting UE may then sort the subchannels according to the received energy on the subchannels and select one or more unused consecutive subchannels with the lowest energy for transmission. Thereafter, after the symbol for Tx / Rx turnaround, the transmitting UE may transmit an LBT sequence in one or more subchannels starting from the third symbol in the TTI. After the LBT sequence, the transmitting UE may transmit control information and data.

[0082] like Figure 6 As shown in , the second UE 604 can monitor during the first LBT symbol 640 of TTI (n+1) to determine whether two consecutive subchannels are being used. If the second UE 604 detects low energy from two subchannels, this can indicate that the two subchannels are not used and can be used for transmission. Accordingly, the second UE 604 selects the two subchannels and transmits the LBT sequence 642 in the two subchannels starting from the third symbol in TTI (n+1), followed by control information 644 and data 646.

[0083] like Figure 6 As further shown in FIG. 6 , the third UE 606 may monitor during the first LBT symbol 660 of TTI(n) to determine whether any subchannel is being used. If the third UE 606 detects low energy from only one subchannel, this may indicate that only this one subchannel is not used and can be used for transmission. Accordingly, the third UE 606 selects the subchannel and transmits an LBT sequence 662 in the subchannel starting from the third symbol in TTI(n), followed by control information 664 and data 666.

[0084] In one aspect, the channel bandwidth 600 used for the channel access mechanism can be scaled to allow more LBT symbols. However, such scaling may increase overhead. Figure 6 A disadvantage of the channel access mechanism of may be that the mechanism only provides transmitter-side concessions. Therefore, the receiver between the two transmitters may have a lower quality of service (QoS). Another disadvantage may be that the mechanism may not scale well with increasing UE density.

[0085] Various aspects of the present disclosure relate to using multiple access (MA) signatures for non-orthogonal multiple access (NOMA). MA signatures are identifiers used to distinguish data transmission modes that vary from UE to UE and can be used to multiplex UEs on a resource set. NOMA uses non-orthogonal signatures. NOMA access can support a large number of UEs when there is an overload factor greater than 1 (>1). For example, when 6 UEs are distributed on 4 resource elements (REs), the overload factor is greater than 1.

[0086] In 3GPP, NOMA in downlink communications can use superposition coding, such as multi-user superposition transmission (MUST). In addition, the receiver can be configured for consecutive interference cancellation (SIC). NOMA in uplink communications can utilize power-controlled grant-free uplink transmission. Schemes may include RSMA, SCMA, interleaved multiple access (IDMA), graph division multiple access (PDMA), multi-user shared access (MUSA), etc.

[0087] For V2X, the transmission may not be power controlled for a certain receiver. Therefore, V2X and NOMA differ with respect to uplink communications in that different tradeoffs and combination schemes are possible. In V2X, coherent interference cancellation (SIC) is required to distinguish between transmitter UEs with power imbalance. In addition, V2X requires MA signatures to distinguish between transmitter UEs that cannot be distinguished by SIC. It is worth noting that the power domain MA scheme is not applicable to V2X.

[0088] Figure 7 A V2X scenario 700 is illustrated in which transmissions to a receiver are not power controlled. Figure 7 , a first transmitting UE 702, a second transmitting UE 704, and a third transmitting UE 706 all transmit to a receiving UE 708. In an example, a first transmission 710 from the first transmitting UE 702 and a second transmission 712 from the second transmitting UE 704 can potentially be distinguished by SIC at the receiving UE 708. However, if such transmissions cannot be distinguished by SIC at the receiving UE 708, an orthogonal / low correlation signature may be required to distinguish the first transmission 710 from the first UE 702 from the third transmission 714 from the third UE 706.

[0089] In one aspect of the present disclosure, to improve transmission reliability as user density increases, MA signatures may be used for control transmissions to make control transmissions more reliable, even when a conflict is detected. For example, a NACK-based reselection scheme is provided to reselect resources in the event of a conflict being detected. In one aspect, a request (REQ)-response (RSP)-based design is provided that allows NOMA / MA signatures to extend REQ and RSP for detecting conflicts during the REQ phase.

[0090] Figure 8 An example TTI structure 800 for REQ-RSP based channel access design is illustrated in accordance with an aspect of the present disclosure.

[0091] The TTI structure 800 may include a first region 802 for conveying control information, for example, over 1 or 2 symbols. In one aspect, the control information includes a transmission request (REQ). That is, the first region 802 carries information related to the REQ, rather than just a sequence. The first region 802 is followed by a second region 804 for conveying orthogonal multiple access (OMA) data over several symbols. A third region 806 for conveying a response (RSP) to the REQ may be after the second region 804. It is noteworthy that the Tx / Rx turnaround region (e.g., 1 / 2 symbol in length) may be before and after the third region 806. In one aspect, the RSP may be in the form of an ACK / NACK or information indicating that the transmitting party should reselect resources for data transmission. In one aspect, the TTI structure 800 for a transmission design based on REQ-RSP (wherein the control information (REQ) is transmitted, followed by the transmission of OMA data and the subsequent RSP) reduces overhead compared to a transmission design in which a REQ is transmitted in a TTI followed by the transmission of RSP, control information, and data.

[0092] On the one hand, Figure 8 The REQ-RSP based transmission design can be implemented with or without LBT symbols. When implemented without LBT symbols, the control information can be transmitted using an MA signature (e.g., RSMA or SCMA) in the first region 802. The MA signature length (e.g., the repetition factor for RSMA) can be configured for the channel bandwidth / resource pool because the MA signature length depends on the QoS and density requirements. In addition, the MA signature length can be dynamically modified based on UE congestion measurements, etc. It is worth noting that the baseline of OMA control information and data can still be supported based on the configuration (with LBT symbols).

[0093] In one aspect, when using MA signature (e.g., RSMA) to transmit control information, the reference symbols (RS) used for the control information are orthogonal. RS can be used to determine the start / stop of resource allocation. It is worth noting that in previous schemes, the start / stop of resource allocation may have been determined based on different LBT sequences.

[0094] In one aspect, the number of orthogonal RS dimensions required for transmission can be determined as follows. For example, the number of orthogonal RS dimensions required can be equal to N x 4, where N is the number of UEs that can be multiplexed in the channel bandwidth / resource pool. The number of UEs that can be multiplexed can determine the probability of collision. Therefore, a higher N value may be required to achieve higher QoS and higher density.

[0095] If N=1, the number of required orthogonal RS dimensions is equal to N x 4 = 1 x 4 = 4. Therefore, the transmitter transmitting OMA control information and data may rely on random selection alone to reduce collisions. It is worth noting that this is the same as the baseline design using the LBT-based mechanism.

[0096] If N=2, the number of required orthogonal RS dimensions is equal to N x 4=2 x 4=8. If N=4, the number of required orthogonal RS dimensions is equal to N x 4=4 x 4=16. If N=8, the number of required orthogonal RS dimensions is equal to N x8=8 x 4=32. More than 32 orthogonal RS dimensions may be difficult to obtain, but low correlation can still be achieved with different sequences.

[0097] Fig. 9 An example resource structure 900 for control symbols with reference symbols (RS) according to an aspect of the present disclosure is illustrated. Fig. 9 , a method for obtaining several orthogonal RS dimensions will be described.

[0098] Several orthogonal RS dimensions can be obtained using one or two root sequences. In addition, the number of RS dimensions that can be obtained can be the product of the maximum number of cyclic shifts, the time domain orthogonal cover code (TD-OCC), the frequency domain orthogonal cover code (FD-OCC), and the number of root sequences. In one example, if the maximum number of cyclic shifts is 4, the TD-OCC is 2, the FD-OCC is 2, and the number of root sequences is 1, the number of RS dimensions that can be obtained = 4x 2x 2x 1 = 16. In another example, if the maximum number of cyclic shifts is 4, the TD-OCC is 2, the FD-OCC is 2, and the number of root sequences is 2, the number of RS dimensions that can be obtained = 4x2x 2x 1 = 32.

[0099] In one aspect, MA sequences may be applied with subchannel-based spreading / interleaving. This is appropriate because two UEs may overlap only in a subset of subchannels.

[0100] In one aspect, the MA sequence can be configured for the channel bandwidth / resource pool according to the MA signature length, the number of control symbols, the number of cyclic shifts, the number of TD-OCCs, the number of FD-OCCs, and the number of root sequences. In one example, the MA signature length is 4, the number of control symbols is 2, the number of cyclic shifts is 4, the number of TD-OCCs is 2, the number of FD-OCCs is 2, and the number of root sequences is 1. This results in a multiplexing factor of 4 and 16 orthogonal RSs for control decoding and allocation size detection.

[0101] Fig.10 An example TTI structure 1000 for REQ-RSP based channel access design in accordance with an aspect of the present disclosure is illustrated.

[0102] The TTI structure 1000 may include a first TTI (TTI(n)) having a first region 1002 for conveying control information over 1 or 2 symbols. In one aspect, the control information includes a transmission request (REQ). The first region 1002 is followed by a second region 1004 for conveying orthogonal multiple access (OMA) data over several symbols. A third region 1006 for conveying a response to the REQ (RSP) may be after the second region 1004. It is noteworthy that a Tx / Rx turnaround region (e.g., having a length of 1 / 2 symbol) may be before and after the third region 1006. The RSP may be in the form of an ACK / NACK or information indicating that the transmitter should reselect resources for data transmission. The TTI structure 1000 may also include a second TTI (TTI(n+1)) having a fourth region 1008 for conveying OMA data. However, if the RSP communicated during the previous TTI (eg, the third region 1006 of TTI(n)) indicated that the transmitter should reselect resources for transmission (eg, due to a collision), then OMA data will not be transmitted in the fourth region 1008 .

[0103] On the one hand, when the MA signature is used to transmit control information, the receiving UE can decode multiple control information from multiple transmitting UEs and determine whether the data corresponding to the multiple control information will conflict. The receiving UE can estimate the signal to interference plus noise ratio (SINR) of the data of interest based on RS. It is worth noting that there can be a one-to-one correspondence between the data RS sequence and the MA signature for control information. Thus, the SINR in the data part can be estimated per UE. The receiving UE can determine whether the data can be decoded based on the SINR estimated for the data (on RS RE).

[0104] Reference Fig.10 , the receiving UE transmits an RSP (in the third area 1006) to the transmitting UE to indicate whether the transmitting UE continues data transmission or reselects resources for transmission due to a conflict. The priority information included in the control information transmitted in the first area 1002 or based on the MA signature is used to determine which transmitting UE should yield. On the one hand, the RSP transmitted to a specific transmitting UE is transmitted using the same MA signature used by the specific transmitting UE to transmit control information (REQ) to the receiving UE. The RSP can be transmitted using a system frame number (SFN). On the one hand, the receiving UE can transmit the RSP to two or more transmitting UEs. For example, the receiving UE can notify one transmitting UE to continue data transmission while notifying another transmitting UE to reselect resources for transmission. On the other hand, the transmitting UE can detect the RSP from the previous TTI to determine whether the next TTI can be used for transmission. Accordingly, the RSP can provide receiving side protection.

[0105] Fig.11 1 is a block diagram illustrating an example of a hardware implementation for a user equipment (UE) 1100 that employs a processing system 1114. For example, the UE 1100 may be as described in Figure 1 and / or the UE illustrated in any one or more of 2.

[0106] The UE 1100 may be implemented with a processing system 1114 including one or more processors 1104. Examples of the processor 1104 include a microprocessor, a microcontroller, a digital signal processor (DSP), a field programmable gate array (FPGA), a programmable logic device (PLD), a state machine, gating logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionalities described throughout this disclosure. In various examples, the UE 1100 may be configured to perform any one or more of the functions described herein. That is, the processor 1104 as utilized in the UE 1100 may be used to implement the functions described below and in Fig.12 and 13 Any one or more of the processes and procedures explained in.

[0107] In this example, the processing system 1114 can be implemented with a bus architecture generally represented by bus 1102. Depending on the specific application and overall design constraints of the processing system 1114, the bus 1102 may include any number of interconnecting buses and bridges. The bus 1102 communicatively couples various circuits including one or more processors (generally represented by processor 1104), memory 1105, and computer-readable media (generally represented by computer-readable media 1106). The bus 1102 may also link various other circuits, such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further. The bus interface 1108 provides an interface between the bus 1102 and the transceiver 1110. The transceiver 1110 provides a communication interface or device for communicating with various other equipment over a transmission medium. Depending on the characteristics of the device, a user interface 1112 (e.g., a keypad, display, speaker, microphone, joystick) may also be provided. Of course, such a user interface 1112 is optional and may be omitted in some examples (such as a base station).

[0108] In some aspects of the present disclosure, the processor 1104 may include a multiple access (MA) signature processing circuit system 1140, which is configured for various functions, including, for example, determining a multiple access (MA) signature for distinguishing a transmission of the transmitting device from another transmission of another transmitting device on the same frequency resource. For example, the MA signature processing circuit system 1140 may be configured to implement the following with respect to Fig.12 One or more functions described (including, for example, block 1202). The processor may also include a control / data processing circuit system 1142, which is configured for various functions, including, for example, using the MA signature to transmit sidelink control information on a first set of frequency resources, the sidelink control information corresponding to the first data information; transmitting the first data information on the first set of frequency resources; determining the second data information and the second set of frequency resources based on a response received from the receiving device; and transmitting the second data information on the second set of frequency resources. For example, the control / data processing circuit system 1142 may be configured to implement the following with respect to Fig.12 The processor 1104 may further include a response processing circuit system 1146 configured to perform various functions, including, for example, receiving a response from a receiving device indicating whether the reception of the first data information was successful. For example, the response processing circuit system 1146 may be configured to implement the following regarding Fig.12 One or more functions described (including, for example, block 1208).

[0109] In one aspect, the MA signature processing circuit system 1140 may also be configured to detect a multiple access (MA) signature used to transmit corresponding sidelink control information from a transmitting device of the one or more transmitting devices, wherein the MA signature distinguishes a transmission of the transmitting device from another transmission of another transmitting device of the one or more transmitting devices on the same frequency resource. For example, the MA signature processing circuit system 1140 may be configured to implement the following with respect to Fig.13 In one aspect, the control / data processing circuit system 1142 may be configured to receive one or more sidelink control information from one or more transmitting devices on a first set of frequency resources; receive or attempt to receive first data information on the first set of frequency resources; and receive second data information on a second set of frequency resources. For example, the control / data processing circuit system 1142 may be configured to implement the following with respect to Fig.13 The processor 1104 may further include an SINR determination circuit system 1144 configured to perform various functions, including, for example, determining a signal to interference plus noise ratio (SINR) of a first data information associated with the corresponding sidelink control information for the detected MA signature; determining the likelihood of successfully receiving the first data information based on the determined SINR. For example, the SINR determination circuit system 1144 may be configured to implement the following with respect to Fig.13 In one aspect, the response processing circuit system 1146 may be further configured to transmit a response to the transmitting device based on the likelihood, wherein the response indicates whether the reception of the first data information was successful. For example, the response processing circuit system 1146 may be configured to implement the following regarding Fig.13 One or more functions described (including, for example, block 1310).

[0110] The processor 1104 is responsible for managing the bus 1102 and general processing, including the execution of software stored on the computer-readable medium 1106. The software, when executed by the processor 1104, causes the processing system 1114 to perform the various functions described below for any particular device. The computer-readable medium 1106 and memory 1105 may also be used to store data that is manipulated by the processor 1104 when executing the software.

[0111] One or more processors 1104 in the processing system can execute software. Software should be broadly interpreted to mean instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether described in software, firmware, middleware, microcode, hardware description language, or other terms. The software may reside on a computer-readable medium 1106. The computer-readable medium 1106 may be a non-transitory computer-readable medium. As examples, non-transitory computer-readable media include magnetic storage devices (e.g., hard disks, floppy disks, magnetic tapes), optical disks (e.g., compact disks (CDs) or digital versatile disks (DVDs)), smart cards, flash memory devices (e.g., card, stick, or key-type drives), random access memory (RAM), read-only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), registers, removable disks, and any other suitable medium for storing software and / or instructions that can be accessed and read by a computer. The computer-readable medium 1106 may reside in the processing system 1114, external to the processing system 1114, or distributed across multiple entities including the processing system 1114. The computer-readable medium 1106 may be implemented in a computer program product. As an example, a computer program product may include a computer-readable medium in packaging materials. Those skilled in the art will recognize how to best implement the described functionality presented throughout this disclosure depending on the specific application and the overall design constraints imposed on the overall system.

[0112] In one or more examples, the computer-readable storage medium 1106 may include multiple access (MA) signature processing instructions 1150, control / data processing instructions 1152, SINR determination instructions 1154, and response processing instructions 1156 configured for various functions. For example, the MA signature processing instructions 1150 may be configured to implement Fig.12 (including, e.g., block 1202) and Fig.13 (including, for example, block 1304) described one or more functions. The control / data processing instructions 1152 may be configured to implement the Fig.12 (including, for example, blocks 1204, 1206, 1210, and 1212) and Fig.13 (including, for example, blocks 1302 and 1312) described above. SINR determination instructions 1154 may be configured to implement Fig.13 The response processing instructions 1156 may be configured to implement one or more functions described herein (including, for example, blocks 1306 and 1308). Fig.12 (including, for example, block 1208) and Fig.13(including, for example, block 1310) described one or more functions.

[0113] Fig.12 1 is a flow chart illustrating an exemplary process 1200 for channel access at a transmitting device according to some aspects of the present disclosure. As described below, some or all of the illustrated features may be omitted in certain implementations within the scope of the present disclosure, and some of the illustrated features may not be required to implement all embodiments. In some examples, process 1200 may be performed by Fig.11 In some examples, process 1200 may be performed by any suitable equipment or device for performing the functions or algorithms described below.

[0114] At block 1202, the transmitting device determines a multiple access (MA) signature for distinguishing a transmission of the transmitting device from another transmission of another transmitting device on the same frequency resources.

[0115] In box 1204, the transmitting device uses the MA signature on the first frequency resource set to transmit side link control information. The side link control information corresponds to the first data information. On the one hand, when transmitting the side link control information, the transmitting device also determines the length of the MA signature and / or the number of reference symbols for transmitting the side link control information. The transmitting device can determine such information via receiving a radio resource control (RRC) configuration message. On the other hand, when transmitting the side link control information, the transmitting device also determines a reference symbol (RS) sequence; and determines a first frequency resource set based on the MA signature for transmitting the RS sequence. In a further aspect, when transmitting the side link control information, the transmitting device can also determine a sequence identifier, a time domain orthogonal cover code (TD-OCC), a frequency domain orthogonal cover code (FD-OCC), and / or a cyclic shift for transmitting the side link control information. Such information can be determined via receiving an RRC configuration message.

[0116] In one aspect, the RS sequence is used to demodulate the side link control information at the receiving device. The RS sequence is also used to measure the signal to interference plus noise ratio (SINR) of the first data information at the receiving device. The RS sequence can be determined based on the MA signature.

[0117] At block 1206, the transmitting device transmits the first data information on the first set of frequency resources. At block 1208, the transmitting device receives a response from the receiving device indicating whether reception of the first data information was successful. In one aspect, the response is based on actual / successful decoding or likelihood of successful decoding of the first data information at the receiving device.

[0118] In one aspect, the response is based on a signal to interference plus noise ratio (SINR) detected on a first frequency resource set used to transmit the first data information. In one aspect, when receiving the response, the transmitting device may receive a negative acknowledgement (NACK) in the case of unsuccessful reception and may not receive a response transmission in the case of successful reception. In another aspect, when receiving the response, the transmitting device may receive a NACK in the case of unsuccessful reception and an acknowledgement (ACK) in the case of successful reception. In a further aspect, when receiving the response, the transmitting device may receive an indication of reselecting a different frequency resource set to transmit data in the case of unsuccessful reception and an indication of continuing to use the first frequency resource set to transmit data in the case of successful reception.

[0119] In block 1210, the transmitting device determines the second data information and the second frequency resource set based on the response received from the receiving device. In block 1212, the transmitting device transmits the second data information on the second frequency resource set. On the one hand, if the response received from the receiving device is NACK, the second data information is the same as the first data information. On the other hand, if the response received from the receiving device is ACK or no response transmission is received, the second data information is different from the first data information and the second frequency resource set is the same as the first frequency resource set. In a further aspect, the response is received in a transmission time interval (TTI). Accordingly, the transmitting device can further determine whether the next TTI is available for transmission based on the response received in the TTI.

[0120] In one configuration, an apparatus 1100 for wireless communication includes: a device for determining a multiple access (MA) signature for distinguishing a transmission of the transmitting device from another transmission of another transmitting device on the same frequency resource; a device for transmitting sidelink control information using the MA signature on a first frequency resource set, the sidelink control information corresponding to first data information; a device for transmitting the first data information on the first frequency resource set; a device for receiving a response from a receiving device indicating whether reception of the first data information is successful; a device for determining second data information and a second frequency resource set based on the response received from the receiving device; a device for transmitting the second data information on the second frequency resource set; and a device for determining whether the next TTI is available for transmission based on the response received in the TTI. In one aspect, the foregoing device may be in Fig.11 The processor 1104 shown in the figure is configured to perform the functions recited by the aforementioned means. On the other hand, the aforementioned means may be a circuit or any equipment configured to perform the functions recited by the aforementioned means.

[0121] Of course, in the above examples, the circuit system included in the processor 1104 is provided only as an example, and other means for performing the described functions may be included in various aspects of the present disclosure, including but not limited to instructions stored in the computer-readable storage medium 1106, or in Figure 1 and / or any of 2 and using, for example, the Fig.12 Any other suitable apparatus or device that implements the described processes and / or algorithms.

[0122] Fig.13 1 is a flow chart illustrating an exemplary process 1300 for channel access at a receiving device according to some aspects of the present disclosure. As described below, some or all of the illustrated features may be omitted in certain implementations within the scope of the present disclosure, and some of the illustrated features may not be required to implement all embodiments. In some examples, process 1300 may be performed by Fig.11 In some examples, process 1300 may be performed by any suitable equipment or device for performing the functions or algorithms described below.

[0123] At block 1302, the receiving device receives one or more sidelink control information from one or more transmitting devices on a first set of frequency resources. At block 1304, the receiving device detects a multiple access (MA) signature used to transmit corresponding sidelink control information from a transmitting device of the one or more transmitting devices. In one aspect, the MA signature distinguishes a transmission of the transmitting device from another transmission of another transmitting device of the one or more transmitting devices on the same frequency resources.

[0124] At block 1306, the receiving device determines a signal to interference plus noise ratio (SINR) of the first data information associated with the corresponding side link control information for the detected MA signature. In one aspect, when determining the SINR, the receiving device may also determine a reference symbol (RS) sequence used to transmit the corresponding side link control information. The RS sequence is determined based on the MA signature. The SINR is determined based on the RS sequence. In addition, the receiving device may use the RS sequence to demodulate the corresponding side link control information.

[0125] At block 1308, the receiving device determines a likelihood of successfully receiving the first data information based on the determined SINR.Thereafter, the receiving device may receive or attempt to receive the first data information on the first set of frequency resources.

[0126] In block 1310, the receiving device transmits a response to the transmitting device based on the likelihood, wherein the response indicates whether reception of the first data information is successful. In one aspect, when transmitting the response, the receiving device transmits a negative acknowledgement (NACK) in the case of unsuccessful reception and refrains from transmitting the response in the case of successful reception. In another aspect, when transmitting the response, the receiving device transmits a NACK in the case of unsuccessful reception and transmits an acknowledgement (ACK) in the case of successful reception. In a further aspect, when transmitting the response, the receiving device may transmit an indication of reselecting a different set of frequency resources to transmit data in the case of unsuccessful reception and transmit an indication of continuing to use the first set of frequency resources to transmit data in the case of successful reception.

[0127] At block 1312, the receiving device receives second data information on a second set of frequency resources. In one aspect, if the response transmitted to the transmitting device is a NACK, then the second data information is the same as the first data information. In a further aspect, if the response transmitted to the transmitting device is an ACK or if no response transmission is transmitted, then the second data information is different from the first data information and the second set of frequency resources is the same as the first set of frequency resources.

[0128] In one configuration, an apparatus 1100 for wireless communication includes: a device for receiving one or more side link control information from one or more transmitting devices on a first frequency resource set; a device for detecting a multiple access (MA) signature used to transmit corresponding side link control information from one of the one or more transmitting devices, wherein the MA signature distinguishes the transmission of the transmitting device from another transmission of another transmitting device of the one or more transmitting devices on the same frequency resource; a device for determining a signal to interference plus noise ratio (SINR) of first data information associated with the corresponding side link control information for the detected MA signature; a device for determining the likelihood of successfully receiving the first data information based on the determined SINR; a device for transmitting a response to the transmitting device based on the likelihood, wherein the response indicates whether the reception of the first data information is successful; a device for determining a reference symbol (RS) sequence used to transmit the corresponding side link control information, wherein the SINR is determined based on the RS sequence; a device for demodulating the corresponding side link control information using the RS sequence; a device for receiving or attempting to receive the first data information on the first frequency resource set; and a device for receiving the second data information on the second frequency resource set. In one aspect, the aforementioned device may be Fig.11 The processor 1104 shown in the figure is configured to perform the functions recited by the aforementioned means. On the other hand, the aforementioned means may be a circuit or any equipment configured to perform the functions recited by the aforementioned means.

[0129] Of course, in the above examples, the circuit system included in the processor 1104 is provided only as an example, and other means for performing the described functions may be included in various aspects of the present disclosure, including but not limited to instructions stored in the computer-readable storage medium 1106, or in Figure 1 and / or any of 2 and using, for example, the Fig.13 Any other suitable apparatus or device that implements the described processes and / or algorithms.

[0130] Several aspects of wireless communication networks have been presented with reference to exemplary implementations. As those skilled in the art will readily appreciate, the various aspects described throughout this disclosure may be extended to other telecommunication systems, network architectures and communication standards.

[0131] As an example, various aspects may be implemented within other systems defined by 3GPP, such as Long Term Evolution (LTE), Evolved Packet System (EPS), Universal Mobile Telecommunications System (UMTS), and / or Global System for Mobile (GSM). Various aspects may also be extended to systems defined by the Third Generation Partnership Project 2 (3GPP2), such as CDMA2000 and / or Evolution Data Optimized (EV-DO). Other examples may be implemented within systems employing IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Ultra Wideband (UWB), Bluetooth, and / or other suitable systems. The actual telecommunication standard, network architecture, and / or communication standard employed will depend on the specific application and the overall design constraints imposed on the system.

[0132] Within the present disclosure, the wording "exemplary" is used to mean "serving as an example, instance, or illustration". Any implementation or aspect described herein as "exemplary" is not necessarily to be construed as superior or superior to other aspects of the present disclosure. Likewise, the term "aspect" does not require that all aspects of the present disclosure include the features, advantages, or modes of operation discussed. The term "coupled" is used herein to refer to a direct or indirect coupling between two objects. For example, if object A physically contacts object B, and object B contacts object C, objects A and C may still be considered to be coupled to each other - even if they are not in direct physical contact with each other. For example, a first object may be coupled to a second object, even if the first object never directly contacts the second object physically. The terms "circuit" and "circuitry" are used broadly and are intended to include both hardware implementations of electronic devices and conductors and software implementations of information and instructions, which, when connected and configured, enable the functions described in the present disclosure to be performed without limitation on the type of electronic circuits, which, when executed by a processor, enable the functions described in the present disclosure to be performed.

[0133] Figure 1-13 One or more of the components, steps, features, and / or functions described herein may be rearranged and / or combined into a single component, step, feature, or function, or implemented in several components, steps, or functions. Additional elements, components, steps, and / or functions may also be added without departing from the novel features disclosed herein. Figure 1-13 The apparatus, devices and / or components illustrated in the can be configured to perform one or more methods, features, or steps described herein. The novel algorithms described herein can also be efficiently implemented in software and / or embedded in hardware.

[0134] It should be understood that the specific order or hierarchy of steps in the disclosed methods is an illustration of an exemplary process. Based on design preferences, it should be understood that the specific order or hierarchy of steps in these methods can be rearranged. The attached method claims present elements of the various steps in a sample order and are not meant to be limited to the specific order or hierarchy presented unless specifically stated herein.

[0135] The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the universal principles defined herein may be applied to other aspects. Therefore, the claims are not intended to be limited to the various aspects shown herein, but should be granted the full scope consistent with the language of the claims, wherein the singular reference to the element is not intended to mean "there is and only one" - unless specifically stated, but intended to mean "one or more". Unless specifically stated otherwise, the term "some / some" refers to one or more. The phrase "at least one of" a list of items refers to any combination of these items, including a single member. As an example, "at least one of a, b or c" is intended to cover: a; b; c; a and b; a and c; b and c; and a, b and c. The elements of the various aspects described throughout this disclosure are all structurally and functionally equivalent schemes currently or hereafter known to those of ordinary skill in the art, and are expressly incorporated herein by reference, and are intended to be covered by the claims. In addition, nothing disclosed herein is intended to be donated to the public, regardless of whether such disclosure is explicitly recorded in the claims.

Claims

1. A method for wireless communication at a transmitting device, comprising: determining a multiple access (MA) signature for distinguishing a sidelink control information transmission of the transmitting device from another sidelink control information transmission of another transmitting device on the same frequency resource; transmitting sidelink control information using the MA signature on a first set of frequency resources, the sidelink control information corresponding to first data information; transmitting the first data information on the first frequency resource set; as well as receiving a response from a receiving device indicating whether reception of the first data information is successful, wherein receiving the response includes receiving an indication regarding reselecting a different set of frequency resources to transmit data if reception is unsuccessful and receiving an indication regarding continuing to use the first set of frequency resources to transmit data if reception is successful; determining second data information and a second set of frequency resources based on the response received from the receiving device; as well as The second data information is transmitted on the second frequency resource set.

2. The method of claim 1, wherein the response is based on a signal to interference plus noise ratio (SINR) detected on the first set of frequency resources used to transmit the first data information.

3. The method of claim 1 , wherein receiving the response comprises at least one of: receiving a negative acknowledgement (NACK) in the event of an unsuccessful reception and failing to receive a response transmission in the event of a successful reception; or NACK is received in case of unsuccessful reception and acknowledgment (ACK) is received in case of successful reception.

4. The method of claim 1, wherein: When the response received from the receiving device is NACK, the second data information is the same as the first data information; and When the response received from the recipient device is an ACK or no response transmission is received, the second data information is different from the first data information and the second set of frequency resources is the same as the first set of frequency resources.

5. The method of claim 1 , wherein transmitting the sidelink control information comprises: At least one of a length of the MA signature or a number of reference symbols is determined for transmitting the sidelink control information.

6. The method of claim 1 , wherein transmitting the sidelink control information comprises: At least one of a sequence identifier, a time domain orthogonal cover code (TD-OCC), a frequency domain orthogonal cover code (FD-OCC), or a cyclic shift is determined for transmitting the sidelink control information.

7. The method of claim 1 , wherein transmitting the sidelink control information comprises: determining a reference symbol (RS) sequence; as well as The first set of frequency resources is determined based on the MA signature for transmitting the RS sequence.

8. The method of claim 7, wherein the sidelink control information is demodulated at the receiving device using the RS sequence.

9. The method of claim 7, wherein a signal to interference plus noise ratio (SINR) of the first data information is measured at the receiving device using the RS sequence.

10. The method of claim 7, wherein determining the RS sequence comprises: The RS sequence is determined based on the MA signature.

11. The method of claim 1 , wherein receiving the response comprises: receiving the response in a transmission time interval (TTI); as well as A determination is made based on the response received in the TTI whether a next TTI is available for transmission.

12. A transmitting device for wireless communication, comprising: means for determining a multiple access (MA) signature for distinguishing a sidelink control information transmission of the transmitting device from another sidelink control information transmission of another transmitting device on the same frequency resources; means for transmitting sidelink control information using the MA signature on a first set of frequency resources, the sidelink control information corresponding to first data information; means for transmitting the first data information on the first set of frequency resources; as well as means for receiving a response from a receiving device indicating whether reception of the first data information is successful, wherein the means for receiving the response is configured to receive an instruction to reselect a different set of frequency resources to transmit data if reception is unsuccessful and to receive an instruction to continue using the first set of frequency resources to transmit data if reception is successful; means for determining second data information and a second set of frequency resources based on the response received from the recipient device; as well as Means for transmitting the second data information on the second set of frequency resources.

13. The transmitting device of claim 12, wherein the response is based on a signal to interference plus noise ratio (SINR) detected on the first set of frequency resources used to transmit the first data information.

14. The transmitting device of claim 12, wherein the means for receiving the response is configured to at least one of: receiving a negative acknowledgement (NACK) in the event of an unsuccessful reception and failing to receive a response transmission in the event of a successful reception; or NACK is received in case of unsuccessful reception and acknowledgment (ACK) is received in case of successful reception.

15. The transmitting device according to claim 12, wherein: When the response received from the receiving device is NACK, the second data information is the same as the first data information; and When the response received from the recipient device is an ACK or no response transmission is received, the second data information is different from the first data information and the second set of frequency resources is the same as the first set of frequency resources.

16. A method for wireless communication at a receiving device, comprising: receiving one or more sidelink control information from one or more transmitting devices on a first set of frequency resources; detecting a multiple access (MA) signature used to transmit corresponding sidelink control information from a transmitting device of the one or more transmitting devices, wherein the MA signature distinguishes a sidelink control information transmission of the transmitting device from another sidelink control information transmission of another transmitting device of the one or more transmitting devices on the same frequency resources; determining, for the detected MA signature, a signal to interference plus noise ratio (SINR) of first data information associated with the corresponding sidelink control information; determining a likelihood of successfully receiving the first data information based on the determined SINR; as well as transmitting a response to the transmitting device based on the likelihood, wherein the response indicates whether reception of the first data information is successful, wherein transmitting the response comprises transmitting an indication to reselect a different set of frequency resources to transmit data if reception is unsuccessful and transmitting an indication to continue to use the first set of frequency resources to transmit data if reception is successful; Second data information is received on a second frequency resource set.

17. The method of claim 16, wherein determining the SINR comprises: A reference symbol (RS) sequence used to transmit the corresponding sidelink control information is determined, wherein the SINR is determined based on the RS sequence.

18. The method of claim 17, wherein determining the SINR comprises: The corresponding sidelink control information is demodulated using the RS sequence.

19. The method of claim 17, wherein the RS sequence is determined based on the MA signature.

20. The method of claim 16, further comprising attempting to receive the first data information on the first set of frequency resources.

21. The method of claim 20, wherein transmitting the response comprises at least one of: transmitting a negative acknowledgement (NACK) in the event of unsuccessful reception and refraining from transmitting the response in the event of successful reception; or NACK is transmitted in case of unsuccessful reception and acknowledgment (ACK) is transmitted in case of successful reception.

22. The method of claim 16, wherein: When the response transmitted to the transmitting device is NACK, the second data information is the same as the first data information; and When the response transmitted to the transmitting device is ACK or if no response transmission is transmitted, the second data information is different from the first data information and the second set of frequency resources is the same as the first set of frequency resources.

23. A receiving device for wireless communication, comprising: means for receiving one or more sidelink control information from one or more transmitting devices on a first set of frequency resources; means for detecting a multiple access (MA) signature used to transmit corresponding sidelink control information from a transmitting device of the one or more transmitting devices, wherein the MA signature distinguishes a sidelink control information transmission of the transmitting device from another sidelink control information transmission of another transmitting device of the one or more transmitting devices on the same frequency resources; means for determining, for the detected MA signature, a signal to interference plus noise ratio (SINR) of first data information associated with the corresponding sidelink control information; means for determining a likelihood of successfully receiving the first data information based on the determined SINR; as well as means for transmitting a response to the transmitting device based on the likelihood, wherein the response indicates whether reception of the first data information is successful, wherein the means for transmitting the response is configured to transmit an indication of reselecting a different set of frequency resources to transmit data if reception is unsuccessful and to transmit an indication of continuing to use the first set of frequency resources to transmit data if reception is successful, The means for receiving is configured to receive second data information on a second set of frequency resources.

24. The receiving device of claim 23, wherein the means for receiving is configured to attempt to receive the first data information on the first set of frequency resources.

25. The recipient device of claim 24, wherein the means for transmitting the response is configured to at least one of: transmitting a negative acknowledgement (NACK) in the event of unsuccessful reception and refraining from transmitting the response in the event of successful reception; or NACK is transmitted in case of unsuccessful reception and acknowledgment (ACK) is transmitted in case of successful reception.

26. The receiving device of claim 23, wherein: When the response transmitted to the transmitting device is NACK, the second data information is the same as the first data information; and When the response transmitted to the transmitting device is ACK or if no response transmission is transmitted, the second data information is different from the first data information and the second set of frequency resources is the same as the first set of frequency resources.

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