Vehicle-to-everything user device and method for use therein

Abstract

Vehicle-to-everything user devices and methods for use therein are disclosed. Wherein the user equipment (UE) comprises: a transceiver; and a processor configured to determine a symbol-based resource pool and a time slot-based resource pool for sidelink (SL) transmission to another V2X UE; the processor and transceiver are configured to perform measurements of the symbol-based resource pool and the time slot-based resource pool to determine available resources; and the processor is configured to determine which available resources are candidate resources selectable for transmission of data based on quality of service (QoS) associated with the data for transmission.

Description

[0001] This application is a divisional application of the invention patent application with the application date of August 7, 2019, application number 201980052948.2, and invention name “Control Information Transmission and Sensing in Wireless Systems”.

[0002] CROSS-REFERENCE TO RELATED APPLICATIONS

[0003] This application claims the benefit of U.S. Provisional Application No. 62 / 715,510, filed on August 7, 2018, the contents of which are incorporated herein by reference. Technical Field

[0004] The present application relates to the field of wireless communications. Background Art

[0005] Long Term Evolution (LTE) vehicle-to-everything (V2X) communications can achieve secure, reliable and efficient transmission services. A subframe can be used as an LTE V2X sidelink (SL) time resource, and thus if the subframe is an LTE uplink (UL) subframe, the subframe can belong to a SL subframe pool. An LTE subframe can be an SL subframe, which can occur in the following cases: if the subframe is not a downlink (DL) or special subframe, such as in a time division duplex (TDD) system, if the subframe is not pre-configured for SL synchronization signal (SLSS) transmission, if the subframe is not a reserved subframe (derived from a bitmap configured by a higher layer), and if the subframe is indicated as available in a bitmap configured by a higher layer.

[0006] The subframes of the SL subframe pool may be arranged in increasing order of subframe index, which may range from 0 to 10240 (for each SFN cycle). The LTE V2X SL time resources and scheduling granularity may be fixed at one subframe, so the SL transmission time interval (TTI) may be one subframe at 1 ms. In an LTE TDD system, the SL subframe pool may only indicate UL subframes indicated in a cell-specific DL / UL assignment semi-statically configured by the network. Summary of the invention

[0007] A vehicle-to-everything (V2X) user equipment (UE) for operation in a fifth generation (5G) wireless network and a corresponding method are described herein. The UE includes at least one transceiver and a processor. The processor is configured to determine a symbol-based resource pool and a slot-based resource pool for a sidelink (SL) transmission to another V2X UE. The processor and the transceiver are configured to perform measurements of the symbol-based resource pool and the slot-based resource pool to determine available resources. The processor is configured to determine which available resources are candidate resources that can be selected for transmission of the data based on a quality of service (QoS) associated with the data for transmission. The symbol-based resource pool for SL transmission to another V2X UE may include uplink (UL) symbols and flexible symbols. The slot-based resource pool for SL transmission to another V2X UE may include uplink (UL) slots and flexible slots. The processor may determine, based on the measurements, that the available resources of the symbol-based resource pool cannot meet the QoS associated with the data for transmission. In this case, the processor selects an available candidate resource from the slot-based resource pool for transmission of the data. The processor may also determine, based on the measurement, that the QoS associated with the data for transmission cannot be met by the available resources of the slot-based resource pool. In this case, the processor selects available candidate resources from the symbol-based resource pool for transmission of the data. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present invention may be understood in more detail from the following description given by way of example in conjunction with the accompanying drawings, in which like reference numerals represent like elements, and in which:

[0009] Figure 1A is a system diagram illustrating an exemplary communication system in which one or more disclosed embodiments may be implemented;

[0010] Figure 1B is a diagram showing that according to an embodiment, Figure 1A A system diagram of an exemplary wireless transmit / receive unit (WTRU) used within a communication system is shown;

[0011] Figure 1C is a diagram showing that according to an embodiment, Figure 1A A system diagram of an exemplary radio access network (RAN) and an exemplary core network (CN) used within the communication system shown;

[0012] Figure 1D is a diagram showing that according to an embodiment, Figure 1A A system diagram of another exemplary RAN and another exemplary CN used within the communication system shown;

[0013] Figure 2 is a schematic diagram of an example SL time resource block (STRB) pool configured based on a user equipment (UE) time slot format;

[0014] Figure 3 is a schematic diagram of an example SL frequency resource allocation based on bandwidth part (BWP) and sub-channels;

[0015] Figure 4 is a schematic diagram of an example UE determination regarding SL transmission STRB;

[0016] Figure 5 is a schematic diagram of UE utilizing segmented SL time resources;

[0017] Figure 6 is a schematic diagram of an exemplary physical SL shared channel (PSSCH) transmission instance and frequency resource allocation; and

[0018] Figure 7 The method flow chart of an embodiment implemented by a V2X UE. DETAILED DESCRIPTION

[0019] Figure 1A 1 is a schematic diagram of an exemplary communication system 100 in which one or more disclosed embodiments may be implemented. The communication system 100 may be a multiple access system that provides content such as voice, data, video, messaging, broadcast, etc. to multiple wireless users. The communication system 100 may enable multiple wireless users to access such content by sharing system resources including wireless bandwidth. For example, the communication system 100 may use one or more channel access methods such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), single carrier FDMA (SC-FDMA), zero tail unique word DFT-spread OFDM (ZT UW DTS-s OFDM), unique word OFDM (UW-OFDM), resource block filtered OFDM, and filter bank multi-carrier (FBMC), etc.

[0020] like Figure 1AAs shown, the communication system 100 may include wireless transmit / receive units (WTRUs) 102a, 102b, 102c, 102d, RAN 104 / 113, CN 106 / 115, public switched telephone network (PSTN) 108, Internet 110, and other networks 112, although it should be appreciated that the disclosed embodiments contemplate any number of WTRUs, base stations, networks, and / or network components. Each of the WTRUs 102a, 102b, 102c, 102d may be any type of device configured to operate and / or communicate in a wireless environment. By way of example, any of the WTRUs 102a, 102b, 102c, 102d may be referred to as a “station” and / or “STA”, which may be configured to transmit and / or receive wireless signals, and may include a user equipment (UE), a mobile station, a fixed or mobile subscriber unit, a subscription-based unit, a pager, a cellular phone, a personal digital assistant (PDA), a smart phone, a laptop, a netbook, a personal computer, a wireless sensor, a hotspot or Mi-Fi device, an Internet of Things (IoT) device, a watch or other wearable device, a head-mounted display (HMD), a vehicle, a drone, medical devices and applications (e.g., remote surgery), industrial devices and applications (e.g., robots and / or other wireless devices working in an industrial and / or automated process chain environment), consumer electronic devices, and devices working on a commercial and / or industrial wireless network, etc. Any of the WTRUs 102a, 102b, 102c, 102d may be interchangeably referred to as a UE.

[0021] The communication system 100 may also include a base station 114a and / or a base station 114b. Each of the base stations 114a, 114b may be any type of device configured to facilitate access to one or more communication networks (e.g., CN 106 / 115, Internet 110, and / or other networks 112) by wirelessly interfacing with at least one of the WTRUs 102a, 102b, 102c, 102d. For example, the base stations 114a, 114b may be a base transceiver station (BTS), a Node B, an eNode B, a Home Node B, a Home eNode B, a gNB, a New Radio (NR) Node B, a site controller, an access point (AP), a wireless router, and the like. Although each of the base stations 114a, 114b is described as a single component, it should be appreciated that the base stations 114a, 114b may include any number of interconnected base stations and / or network components.

[0022] The base station 114a may be part of the RAN 104 / 113, and the RAN may also include other base stations and / or network components (not shown), such as a base station controller (BSC), a radio network controller (RNC), a relay node, and the like. The base station 114a and / or the base station 114b may be configured to transmit and / or receive wireless signals on one or more carrier frequencies called cells (not shown). These frequencies may be in a licensed spectrum, an unlicensed spectrum, or a combination of licensed and unlicensed spectrum. A cell may provide wireless service coverage for a specific geographic area that is relatively fixed or may change over time. A cell may be further divided into cell sectors. For example, a cell associated with the base station 114a may be divided into three sectors. Thus, in one embodiment, the base station 114a may include three transceivers, i.e., each transceiver corresponds to a sector of the cell. In an embodiment, the base station 114a may use multiple-input multiple-output (MIMO) technology, and may use multiple transceivers for each sector of the cell. For example, by using beamforming, signals may be transmitted and / or received in a desired spatial direction.

[0023] The base stations 114a, 114b may communicate with one or more of the WTRUs 102a, 102b, 102c, 102d over an air interface 116, which may be any suitable wireless communication link (e.g., radio frequency (RF), microwave, centimeter wave, millimeter wave, infrared (IR), ultraviolet (UV), visible light, etc.). The air interface 116 may be established using any suitable radio access technology (RAT).

[0024] More specifically, as described above, the communication system 100 may be a multiple access system and may use one or more channel access schemes, such as CDMA, TDMA, FDMA, OFDMA, and SC-FDMA, among others. For example, the base station 114a in the RAN 104 / 113 and the WTRUs 102a, 102b, 102c may implement a radio technology such as Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access (UTRA), which may use Wideband CDMA (WCDMA) to establish an air interface 115 / 116 / 117. WCDMA may include communication protocols such as High Speed ​​Packet Access (HSPA) and / or Evolved HSPA (HSPA+). HSPA may include High Speed ​​Downlink (DL) Packet Access (HSDPA) and / or High Speed ​​UL Packet Access (HSUPA).

[0025] In an embodiment, the base station 114a and the WTRUs 102a, 102b, 102c may implement a radio technology such as Evolved UMTS Terrestrial Radio Access (E-UTRA), which may establish the air interface 116 using Long Term Evolution (LTE) and / or Advanced LTE (LTE-A) and / or Advanced LTE Pro (LTE-A Pro).

[0026] In an embodiment, the base station 114a and the WTRUs 102a, 102b, 102c may implement a radio technology that may establish the air interface 116 using new radio (NR), such as NR radio access.

[0027] In an embodiment, the base station 114a and the WTRUs 102a, 102b, 102c may implement multiple radio access technologies. For example, the base station 114a and the WTRUs 102a, 102b, 102c may jointly implement LTE radio access and NR radio access (e.g., using dual connectivity (DC) principles). Thus, the air interface used by the WTRUs 102a, 102b, 102c may be characterized by multiple types of radio access technologies and / or transmissions sent to / from multiple types of base stations (e.g., eNBs and gNBs).

[0028] In other embodiments, the base station 114a and the WTRUs 102a, 102b, 102c may implement radio technologies such as IEEE 802.11 (i.e., Wireless Fidelity (WiFi)), IEEE 802.16 (i.e., Worldwide Interoperability for Microwave Access (WiMAX)), CDMA2000, CDMA2000 1X, CDMA2000EV-DO, Interim Standard 2000 (IS-2000), Interim Standard 95 (IS-95), Interim Standard 856 (IS-856), Global System for Mobile Communications (GSM), Enhanced Data Rates for GSM Evolution (EDGE), and GSM EDGE (GERAN), among others.

[0029] Figure 1AThe base station 114b in the example may be, for example, a wireless router, a Home NodeB, a Home eNodeB, or an access point, and may use any appropriate RAT to facilitate wireless connectivity in a local area, such as a business location, a residence, a vehicle, a campus, an industrial facility, an air corridor (e.g., for use by drones), a road, and the like. In one embodiment, the base station 114b and the WTRUs 102c, 102d may establish a wireless local area network (WLAN) by implementing a radio technology such as IEEE 802.11. In an embodiment, the base station 114b and the WTRUs 102c, 102d may establish a wireless personal area network (WPAN) by implementing a radio technology such as IEEE 802.15. In yet another embodiment, the base station 114b and the WTRUs 102c, 102d may establish a picocell or a femtocell by using a cellular-based RAT (e.g., WCDMA, CDMA2000, GSM, LTE, LTE-A, LTE-A Pro, NR, and the like). As Figure 1A As shown, the base station 114b may be directly connected to the Internet 110. Thus, the base station 114b does not need to access the Internet 110 via the CN 106 / 115.

[0030] The RAN 104 / 113 may be in communication with the CN 106 / 115, which may be any type of network configured to provide voice, data, applications, and / or Voice over Internet Protocol (VoIP) services to one or more of the WTRUs 102a, 102b, 102c, 102d. The data may have different quality of service (QoS) requirements, such as different throughput requirements, latency requirements, fault tolerance requirements, reliability requirements, data throughput requirements, mobility requirements, etc. The CN 106 / 115 may provide call control, billing services, mobile location-based services, prepaid calls, Internet connectivity, video distribution, etc., and / or may perform advanced security functions such as user authentication. Although in Figure 1A Although not shown, it will be appreciated that the RAN 104 / 113 and / or the CN 106 / 115 may be in direct or indirect communication with other RANs that employ the same RAT or a different RAT as the RAN 104 / 113. For example, in addition to being connected to the RAN 104 / 113 employing NR radio technology, the CN 106 / 115 may also be in communication with another RAN (not shown) employing GSM, UMTS, CDMA 2000, WiMAX, E-UTRA, or WiFi radio technology.

[0031] The CN 106 / 115 may also act as a gateway for the WTRUs 102a, 102b, 102c, 102d to access the PSTN 108, the Internet 110, and / or other networks 112. The PSTN 108 may include a circuit-switched telephone network that provides plain old telephone service (POTS). The Internet 110 may include a global system of interconnected computer network devices that use common communication protocols (e.g., TCP, User Datagram Protocol (UDP), and / or IP in the Transmission Control Protocol / Internet Protocol (TCP / IP) Internet protocol suite). The networks 112 may include wired or wireless communication networks owned and / or operated by other service providers. For example, the networks 112 may include another CN connected to one or more RANs, where the one or more RANs may use the same RAT or a different RAT as the RAN 104 / 113.

[0032] Some or all of the WTRUs 102a, 102b, 102c, 102d in the communication system 100 may include multi-mode capabilities (e.g., the WTRUs 102a, 102b, 102c, 102d may include multiple transceivers for communicating with different wireless networks over different wireless links). Figure 1A The illustrated WTRU 102c may be configured to communicate with the base station 114a, which may employ a cellular-based radio technology, and with the base station 114b, which may employ an IEEE 802 radio technology.

[0033] Figure 1B is a system diagram illustrating an exemplary WTRU 102. Figure 1B As shown, the WTRU 102 may include a processor 118, a transceiver 120, a transmit / receive element 122, a speaker / microphone 124, a numeric keypad 126, a display / touchpad 128, a non-removable memory 130, a removable memory 132, a power source 134, a global positioning system (GPS) chipset 136, and / or peripherals 138. It should be appreciated that the WTRU 102 may include any sub-combination of the foregoing elements while remaining consistent with an embodiment.

[0034] The processor 118 may be a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors associated with a DSP core, a controller, a microcontroller, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) circuit, any other type of integrated circuit (IC), a state machine, and the like. The processor 118 may perform signal coding, data processing, power control, input / output processing, and / or any other functionality that enables the WTRU 102 to operate in a wireless environment. The processor 118 may be coupled to the transceiver 120, which may be coupled to the transmit / receive element 122. Although Figure 1B The processor 118 and the transceiver 120 are depicted as separate components, however it should be appreciated that the processor 118 and the transceiver 120 may also be integrated together in one electronic component or chip.

[0035] The transmit / receive component 122 may be configured to transmit or receive signals to or from a base station (e.g., base station 114a) via the air interface 116. For example, in one embodiment, the transmit / receive component 122 may be an antenna configured to transmit and / or receive RF signals. As an example, in another embodiment, the transmit / receive component 122 may be an emitter / detector configured to transmit and / or receive IR, UV, or visible light signals. In yet another embodiment, the transmit / receive component 122 may be configured to transmit and / or receive RF and light signals. It should be appreciated that the transmit / receive component 122 may be configured to transmit and / or receive any combination of wireless signals.

[0036] Although in Figure 1B 102 as a single component, but the WTRU 102 may include any number of transmit / receive components 122. More specifically, the WTRU 102 may employ MIMO technology. Thus, in one embodiment, the WTRU 102 may include two or more transmit / receive components 122 (e.g., multiple antennas) for transmitting and receiving wireless signals over the air interface 116.

[0037] The transceiver 120 may be configured to modulate signals to be transmitted by the transmit / receive component 122 and to demodulate signals received by the transmit / receive component 122. As described above, the WTRU 102 may have multi-mode capabilities. Thus, the transceiver 120 may include multiple transceivers that allow the WTRU 102 to communicate via multiple RATs (e.g., NR and IEEE 802.11).

[0038] The processor 118 of the WTRU 102 may be coupled to a speaker / microphone 124, a numeric keypad 126, and / or a display / touchpad 128 (e.g., a liquid crystal display (LCD) display unit or an organic light emitting diode (OLED) display unit), and may receive user input data from these components. The processor 118 may also output user data to the speaker / microphone 124, the keypad 126, and / or the display / touchpad 128. In addition, the processor 118 may access information from and store information in any suitable memory such as a non-removable memory 130 and / or a removable memory 132. The non-removable memory 130 may include a random access memory (RAM), a read-only memory (ROM), a hard disk, or any other type of memory storage device. The removable memory 132 may include a subscriber identity module (SIM) card, a memory stick, a secure digital (SD) memory card, and the like. In other embodiments, the processor 118 may access information from, and store data in, memory that is not physically located on the WTRU 102, such as, for example, on a server or a home computer (not shown).

[0039] The processor 118 may receive power from the power source 134, and may be configured to distribute and / or control power for use by other components in the WTRU 102. The power source 134 may be any suitable device for powering the WTRU 102. For example, the power source 134 may include one or more dry cell batteries (e.g., nickel-cadmium (Ni-Cd), nickel-zinc (Ni-Zn), nickel-metal hydride (NiMH), lithium-ion (Li-ion), etc.), solar cells, fuel cells, and the like.

[0040] The processor 118 may also be coupled to the GPS chipset 136, which may be configured to provide location information (e.g., longitude and latitude) related to the current location of the WTRU 102. In addition to or in lieu of the information from the GPS chipset 136, the WTRU 102 may receive location information from a base station (e.g., base stations 114a, 114b) via the air interface 116 and / or determine its location based on the timing of signals received from two or more nearby base stations. It should be appreciated that the WTRU 102 may acquire location information via any suitable positioning method while remaining consistent with an embodiment.

[0041] The processor 118 may also be coupled to other peripheral devices 138, wherein the peripheral devices may include one or more software and / or hardware modules that provide additional features, functions, and / or wired or wireless connections. For example, the peripheral devices 138 may include an accelerometer, an electronic compass, a satellite transceiver, a digital camera (for photos and / or videos), a universal serial bus (USB) port, a vibration device, a television transceiver, a hands-free headset, a module, a frequency modulation (FM) radio unit, a digital music player, a media player, a video game console module, an Internet browser, a virtual reality and / or augmented reality (VR / AR) device, and an activity tracker, etc. The peripheral devices 138 may include one or more sensors, which may be one or more of the following: a gyroscope, an accelerometer, a Hall effect sensor, a magnetometer, an orientation sensor, a proximity sensor, a temperature sensor, a time sensor, a geolocation sensor, an altimeter, a light sensor, a touch sensor, a magnetometer, a barometer, a gesture sensor, a biometric sensor, and / or a humidity sensor, etc.

[0042] The WTRU 102 may include a full-duplex radio in which reception or transmission of some or all signals (e.g., associated with specific subframes for UL (e.g., for transmission) and downlink (e.g., for reception)) may be concurrent and / or simultaneous for the radio. The full-duplex radio may include an interference management unit 139 that reduces and / or substantially eliminates self-interference by means of hardware (e.g., chokes) or by signal processing by a processor (e.g., a separate processor (not shown) or by the processor 118). In an embodiment, the WTRU 102 may include a half-duplex radio that transmits and receives some or all signals (e.g., associated with specific subframes for UL (e.g., for transmission) or downlink (e.g., for reception)).

[0043] Figure 1C 1 is a system diagram showing the RAN 104 and the CN 106 according to an embodiment. As described above, the RAN 104 may communicate with the WTRUs 102a, 102b, 102c using an E-UTRA radio technology over the air interface 116. The RAN 104 may also communicate with the CN 106.

[0044] The RAN 104 may include eNode-Bs 160a, 160b, 160c, however it will be appreciated that the RAN 104 may include any number of eNode-Bs while remaining consistent with an embodiment. The eNode-Bs 160a, 160b, 160c may each include one or more transceivers for communicating with the WTRUs 102a, 102b, 102c over the air interface 116. In one embodiment, the eNode-Bs 160a, 160b, 160c may implement MIMO technology. Thus, for example, the eNode-B 160a may use multiple antennas to transmit wireless signals to, and / or receive wireless signals from, the WTRU 102a.

[0045] Each of the eNodeBs 160a, 160b, 160c may be associated with a particular cell (not shown) and may be configured to handle radio resource management decisions, handover decisions, user scheduling in the UL and / or DL, etc. Figure 1C As shown, the eNode-Bs 160a, 160b, 160c may communicate with each other via an X2 interface.

[0046] Figure 1C The illustrated CN 106 may include a mobility management entity (MME) 162, a serving gateway (SGW) 164, and a packet data network (PDN) gateway (or PGW) 166. Although each of the aforementioned components is described as being part of the CN 106, it should be appreciated that any of these components may be owned and / or operated by an entity other than the CN operator.

[0047] The MME 162 may be connected to each of the eNode-Bs 162a, 162b, 162c in the RAN 104 via an S1 interface and may serve as a control node. For example, the MME 162 may be responsible for authenticating users of the WTRUs 102a, 102b, 102c, performing bearer activation / deactivation processing, selecting a particular serving gateway during an initial attach procedure for the WTRUs 102a, 102b, 102c, and the like. The MME 162 may provide a control plane function for switching between the RAN 104 and other RANs (not shown) that employ other radio technologies, such as GSM and / or WCDMA.

[0048] The SGW 164 may be connected to each of the eNode-Bs 160a, 160b, 160c in the RAN 104 via an S1 interface. The SGW 164 may generally route and forward user data packets to / from the WTRUs 102a, 102b, 102c. The SGW 164 may also perform other functions, such as anchoring the user plane during an inter-eNB handover, triggering paging processing when DL data is available for the WTRUs 102a, 102b, 102c, and managing and storing the contexts of the WTRUs 102a, 102b, 102c, and the like.

[0049] The SGW 164 may be connected to the PGW 146, which may provide the WTRUs 102a, 102b, 102c with access to packet-switched networks, such as the Internet 110, to facilitate communications between the WTRUs 102a, 102b, 102c and IP-enabled devices.

[0050] The CN 106 may facilitate communications with other networks. For example, the CN 106 may provide the WTRUs 102a, 102b, 102c with access to circuit-switched networks, such as the PSTN 108, to facilitate communications between the WTRUs 102a, 102b, 102c and traditional land-line communications devices. For example, the CN 106 may include or communicate with an IP gateway, such as an IP Multimedia Subsystem (IMS) server, and the IP gateway may serve as an interface between the CN 106 and the PSTN 108. In addition, the CN 106 may provide the WTRUs 102a, 102b, 102c with access to other networks 112, which may include other wired and / or wireless networks owned and / or operated by other service providers.

[0051] Although in Figures 1A-1D While the WTRU is described as a wireless terminal, it should be appreciated that in certain representative embodiments, such a terminal may use a (eg, temporary or permanent) wired communication interface with a communication network.

[0052] In a representative embodiment, the other network 112 may be a WLAN.

[0053] A WLAN using an infrastructure basic service set (BSS) mode may have an access point (AP) for the BSS and one or more stations (STAs) associated with the AP. The AP may access or be connected to a distributed system (DS) or other types of wired / wireless networks that send traffic into and / or out of the BSS. Traffic originating from outside the BSS and destined for the STA may arrive through the AP and be delivered to the STA. Traffic originating from the STA and destined for a destination outside the BSS may be sent to the AP for delivery to the corresponding destination. Traffic between STAs within the BSS may be sent through the AP, for example, under the condition that the source STA may send traffic to the AP and the AP may deliver traffic to the destination STA. Traffic between STAs within the BSS may be considered and / or referred to as point-to-point traffic. The point-to-point traffic may be sent using a direct link establishment (DLS) between the source and destination STAs (e.g., directly therebetween). In certain representative embodiments, the DLS may use 802.11e DLS or 802.11z channelized DLS (TDLS)). For example, a WLAN using an independent BSS (IBSS) mode does not have an AP, and STAs (e.g., all STAs) within or using the IBSS can communicate directly with each other. Here, the IBSS communication mode may sometimes be referred to as an "ad-hoc" communication mode.

[0054] When using the 802.11ac infrastructure mode of operation or a similar mode of operation, the AP may transmit a beacon on a fixed channel (e.g., a primary channel). The primary channel may have a fixed width (e.g., a bandwidth of 20 MHz) or a width dynamically set via signaling. The primary channel may be an operating channel of the BSS and may be used by STAs to establish a connection with the AP. In certain representative embodiments, carrier sense multiple access (CSMA / CA) with collision avoidance (e.g., in an 802.11 system) may be implemented. For CSMA / CA, STAs (e.g., each STA) including the AP may sense the primary channel. If a particular STA senses / detects and / or determines that the primary channel is busy, the particular STA may back off. In a specified BSS, one STA (e.g., only one station) transmits at any given time.

[0055] A high throughput (HT) STA may communicate using a 40 MHz wide channel (eg, by combining a 20 MHz wide primary channel with a 20 MHz wide adjacent or non-adjacent channel to form a 40 MHz wide channel).

[0056] Very high throughput (VHT) STA can support channels with widths of 20MHz, 40MHz, 80MHz and / or 160MHz. 40MHz and / or 80MHz channels can be formed by combining continuous 20MHz channels. A 160MHz channel can be formed by combining 8 continuous 20MHz channels or by combining two discontinuous 80MHz channels (this combination can be referred to as an 80+80 configuration). For the 80+80 configuration, after channel coding, the data can be transmitted and passed through a segment parser, which can separate the data into two streams. Inverse Fast Fourier Transform (IFFT) processing and time domain processing can be performed separately on each stream. The stream can be mapped on two 80MHz channels, and the data can be transmitted by the STA performing the transmission. At the receiver of the STA performing the reception, the above operations for the 80+80 configuration can be reversed, and the combined data can be sent to the medium access control (MAC).

[0057] 802.11af and 802.11ah support working modes below 1 GHz. Compared with 802.11n and 802.11ac, the channel working bandwidth and carrier used in 802.11af and 802.11ah are reduced. 802.11af supports 5MHz, 10MHz and 20MHz bandwidths in the TV White Space (TVWS) spectrum, and 802.11ah supports 1MHz, 2MHz, 4MHz, 8MHz and 16MHz bandwidths using non-TVWS spectrum. According to a representative embodiment, 802.11ah can support instrument type control / machine type communication, such as MTC devices in macro coverage areas. MTC devices can have certain capabilities, such as limited capabilities including support (e.g., only support) certain and / or limited bandwidths. MTC devices can include a battery, and the battery life of the battery is higher than a threshold (e.g., for maintaining a very long battery life).

[0058] For WLAN systems that can support multiple channels and channel bandwidths (e.g., 802.11n, 802.11ac, 802.11af, and 802.11ah), these systems include channels that can be designated as primary channels. The bandwidth of the primary channel can be equal to the maximum common operating bandwidth supported by all STAs in the BSS. The bandwidth of the primary channel can be set and / or limited by a certain STA, where the STA originates from all STAs operating in the BSS that supports the minimum bandwidth operating mode. In the example of 802.11ah, even if the AP and other STAs in the BSS support 2MHz, 4MHz, 8MHz, 16MHz and / or other channel bandwidth operating modes, for STAs (e.g., MTC-type devices) that support (e.g., only support) 1MHz mode, the width of the primary channel can be 1MHz. Carrier sensing and / or network allocation vector (NAV) settings can depend on the state of the primary channel. If the primary channel is busy (eg, because a STA (which only supports 1 MHz operating mode) is transmitting to the AP), then the entire available frequency band may be considered busy even though most of the available frequency band remains idle and available for use.

[0059] In the United States, the available frequency band for 802.11ah is 902MHz to 928MHz. In South Korea, the available frequency band is 917.5MHz to 923.5MHz. In Japan, the available frequency band is 916.5MHz to 927.5MHz. Depending on the country code, the total bandwidth available for 802.11ah is 6MHz to 26MHz.

[0060] Figure 1D 1 is a system diagram showing the RAN 113 and the CN 115 according to an embodiment. As described above, the RAN 113 may communicate with the WTRUs 102a, 102b, 102c using NR radio technology over the air interface 116. The RAN 113 may also communicate with the CN 115.

[0061] The RAN 113 may include gNBs 180a, 180b, 180c, though it will be appreciated that the RAN 113 may include any number of gNBs while remaining consistent with an embodiment. The gNBs 180a, 180b, 180c may each include one or more transceivers to communicate with the WTRUs 102a, 102b, 102c over the air interface 116. In one embodiment, the gNBs 180a, 180b, 180c may implement MIMO technology. For example, the gNBs 180a, 180b may use beamforming processing to transmit and / or receive signals to and / or from the gNBs 180a, 180b, 180c. Thus, for example, the gNB 180a may use multiple antennas to transmit wireless signals to the WTRU 102a and receive wireless signals from the WTRU 102a. In an embodiment, the gNBs 180a, 180b, 180c may implement carrier aggregation technology. For example, gNB 180a may transmit multiple component carriers to WTRU 102a (not shown). A subset of these component carriers may be on unlicensed spectrum, while the remaining component carriers may be on licensed spectrum. In an embodiment, gNBs 180a, 180b, 180c may implement coordinated multi-point (CoMP) technology. For example, WTRU 102a may receive coordinated transmissions from gNB 180a and gNB 180b (and / or gNB 180c).

[0062] The WTRUs 102a, 102b, 102c may communicate with the gNBs 180a, 180b, 180c using transmissions associated with a scalable digital configuration. For example, the OFDM symbol spacing and / or OFDM subcarrier spacing may be different for different transmissions, different cells, and / or different portions of the radio transmission spectrum. The WTRUs 102a, 102b, 102c may communicate with the gNBs 180a, 180b, 180c using subframes or transmission time intervals (TTIs) of different or scalable lengths (e.g., containing different numbers of OFDM symbols and / or lasting different absolute time lengths).

[0063] The gNBs 180a, 180b, 180c may be configured to communicate with the WTRUs 102a, 102b, 102c in a standalone configuration and / or a non-standalone configuration. In a standalone configuration, the WTRUs 102a, 102b, 102c may communicate with the gNBs 180a, 180b, 180c without accessing other RANs (e.g., the eNodeBs 160a, 160b, 160c). In a standalone configuration, the WTRUs 102a, 102b, 102c may use one or more of the gNBs 180a, 180b, 180c as mobility anchors. In a standalone configuration, the WTRUs 102a, 102b, 102c may communicate with the gNBs 180a, 180b, 180c using signals in an unlicensed band. In a non-standalone configuration, the WTRU 102a, 102b, 102c may communicate / connect to the gNB 180a, 180b, 180c while communicating / connecting to another RAN (e.g., the eNode-B 160a, 160b, 160c). For example, the WTRU 102a, 102b, 102c may communicate with one or more gNBs 180a, 180b, 180c and one or more eNode-Bs 160a, 160b, 160c in a substantially simultaneous manner by implementing the DC principle. In a non-standalone configuration, the eNode-B 160a, 160b, 160c may act as a mobility anchor for the WTRU 102a, 102b, 102c, and the gNB 180a, 180b, 180c may provide additional coverage and / or throughput to serve the WTRU 102a, 102b, 102c.

[0064] Each of the gNBs 180a, 180b, 180c may be associated with a particular cell (not shown) and may be configured to handle radio resource management decisions, handover decisions, user scheduling in UL and / or DL, support network slicing, dual connectivity, implement interworking between NR and E-UTRA, route user plane data to a user plane function (UPF) 184a, 184b, and route control plane information to an access and mobility management function (AMF) 182a, 182b, and the like. Figure 1D As shown, gNBs 180a, 180b, and 180c can communicate with each other through the Xn interface.

[0065] Figure 1DThe CN 115 shown may include at least one AMF 182a, 182b, at least one UPF 184a, 184b, at least one session management function (SMF) 183a, 183b, and may include a data network (DN) 185a, 185b. Although each of the aforementioned components is described as part of the CN 115, it should be understood that any of these components may be owned and / or operated by an entity other than the CN operator.

[0066] The AMF 182a, 182b may be connected to one or more of the gNBs 180a, 180b, 180c in the RAN 113 via the N2 interface and may act as a control node. For example, the AMF 182a, 182b may be responsible for authenticating users of the WTRU 102a, 102b, 102c, supporting network slicing (e.g., handling different PDU sessions with different requirements), selecting a specific SMF 183a, 183b, managing registration areas, terminating NAS signaling, and mobility management, etc. The AMF 182a, 182b may use network slicing processing to customize the CN support provided to the WTRU 102a, 102b, 102c based on the type of service used by the WTRU 102a, 102b, 102c. As an example, different network slices may be established for different use cases, such as services relying on Ultra Reliable Low Latency (URLLC) access, services relying on enhanced massive mobile broadband (eMBB) access, and / or services for machine type communication (MTC) access, etc. The AMF 182 may provide a control plane function for switching between the RAN 113 and other RANs (not shown) using other radio technologies (e.g., LTE, LTE-A, LTE-A Pro, and / or non-3GPP access technologies such as WiFi).

[0067] The SMF 183a, 183b may be connected to the AMF 182a, 182b in the CN 115 via the N11 interface. The SMF 183a, 183b may also be connected to the UPF 184a, 184b in the CN 115 via the N4 interface. The SMF 183a, 183b may select and control the UPF 184a, 184b, and may configure traffic routing through the UPF 184a, 184b. The SMF 183a, 183b may perform other functions such as managing and allocating WTRU or UE IP addresses, managing PDU sessions, controlling policy enforcement and QoS, and providing downlink data notifications, etc. The PDU session type may be IP-based, non-IP-based, Ethernet-based, etc.

[0068] The UPF 184a, 184b can be connected to one or more of the gNBs 180a, 180b, 180c in the RAN 113 via the N3 interface, which can provide the WTRUs 102a, 102b, 102c with access to packet-switched networks (e.g., the Internet 110) to facilitate communication between the WTRUs 102a, 102b, 102c and IP-enabled devices. The UPF 184, 184b can perform other functions such as routing and forwarding packets, implementing user plane policies, supporting multi-host PDU sessions, processing user plane QoS, buffering downlink packets, and providing mobility anchor processing, etc.

[0069] The CN 115 may facilitate communications with other networks. For example, the CN 115 may include or may communicate with an IP gateway (e.g., an IP Multimedia Subsystem (IMS) server) that acts as an interface between the CN 115 and the PSTN 108. In addition, the CN 115 may provide the WTRUs 102a, 102b, 102c with access to other networks 112, which may include other wired and / or wireless networks owned and / or operated by other service providers. In one embodiment, the WTRUs 102a, 102b, 102c may be connected to the local data network (DN) 185a, 185b via an N3 interface connected to the UPF 184a, 184b and an N6 interface between the UPF 184a, 184b and the DN 185a, 185b and through the UPF 184a, 184b.

[0070] In view of Figures 1A-1D and about Figures 1A-1D , one or more or all of the functions described herein with reference to one or more of the following may be performed by one or more simulation devices (not shown): WTRU 102a-d, base station 114a-b, eNodeB 160a-c, MME 162, SGW 164, PGW 166, gNB 180a-c, AMF 182a-b, UPF 184a-b, SMF 183a-b, DN 185a-b, and / or one or more other devices described herein. These simulation devices may be one or more devices configured to simulate one or more or all of the functions described herein. For example, these simulation devices may be used to test other devices and / or simulate network and / or WTRU functions.

[0071] The simulation device can be designed to implement one or more tests about other devices in a laboratory environment and / or an operator network environment. For example, the one or more simulation devices can perform one or more or all functions while being implemented and / or deployed as a part of a wired and / or wireless communication network in whole or in part to test other devices inside the communication network. The one or more simulation devices can perform one or more or all functions while being temporarily implemented or deployed as a part of a wired and / or wireless communication network. The simulation device can be directly coupled to other equipment to perform the test, and / or can use over-the-air wireless communication to perform the test.

[0072] The one or more simulation devices can perform one or more functions, including all functions, while not being implemented or deployed as part of a wired and / or wireless communication network. For example, the simulation device can be used in a test lab and / or a test scenario of a wired and / or wireless communication network that is not deployed (e.g., tested) to implement tests on one or more components. The one or more simulation devices can be test devices. The simulation device can transmit and / or receive data using direct RF coupling and / or wireless communication with the aid of RF circuits (e.g., which can include one or more antennas).

[0073] LTE V2X SL frequency resources may be determined based on subchannels configured by higher layers. Each subchannel may include a set of contiguous resource blocks (RBs) defined in the LTE UL band. The starting RB and number of RBs of a subchannel may be explicitly indicated in the higher layer configuration.

[0074] LTE V2X SL Control Information (SCI) (i.e., SCI format 1) may be sent in the physical SL control channel (PSCCH) and carries scheduling information related to transmissions of the associated PSSCH. The SCI format 1 includes the frequency resource location for the initial transmission, the modulation and coding scheme (MCS), the priority of the transport block carried in the PSSCH, the time gap between the initial transmission and the retransmission, the retransmission index and / or the bit field for resource reservation.

[0075] For transmission mode 3, LTE V2X SL scheduling can be done by the network in, for example, the G Node B scheduler, and the UE can determine the SCI format 1 content based on the downlink control information (DCI) format 5A received in the LTE DL transmission. For transmission mode 4, the scheduling and corresponding SCI format 1 content can be based on UE sensing and UE higher layer pre-configuration without network involvement.

[0076] The LTE V2X PSCCH and its associated PSSCH can be multiplexed in the frequency domain, i.e., transmitted in the same subframe. The frequency resource allocation of these two channels can be configured as adjacent or non-adjacent. In an adjacent configuration, PSCCH and PSSCH are transmitted in adjacent RBs, with PSCCH occupying the first two RBs. In a non-adjacent configuration, two separate subchannel pools are configured for PSCCH and PSSCH.

[0077] New Radio (NR) Uu resource configuration can support slot-based and non-slot-based time resource configurations for scheduling and transmission. The slot-based time resources can be based on a slot of 14 symbols, regardless of numerology and scheduling, and the TTI can be fixed at a slot for the duration. The non-slot-based (i.e., micro-slot-based) time resources can be based on 2, 4, or 7 symbols according to the NR R15 standard, so there can be multiple scheduling instances within a slot. The resulting finer scheduling and transmission granularity provides the flexibility to support NR applications with different requirements for data rate, latency, and reliability.

[0078] For NR TDD systems, the NR Uu interface can support highly flexible DL and UL time resource assignments by adopting semi-static and dynamic DL / UL assignments using slot format configurations. The semi-static slot format configuration can be sent in a cell-specific system information broadcast (SIB) transmission and a UE-specific radio resource control (RRC) configuration message. The cell-specific slot format configuration can allocate symbols, such as DL, UL, or flexible symbols. The flexible symbols can then be reassigned as DL or UL symbols by a UE-specific slot format configuration, which can be semi-static or dynamic. The UE-specific slot format configuration can be signaled using RRC signaling and can include an indication on a per-slot basis as to which flexible symbol(s) are reassigned as DL or UL symbols. Flexible symbols without such an indication can remain as flexible symbols.

[0079] The remaining flexible symbols can be reassigned as DL or UL symbols on a dynamic basis by the network via the slot format indicator (SFI) index sent in DCI format 2_0 carried in the group common PDCCH (GC-PDCCH). The UE can monitor DCI format 2_0 using the SFI radio network temporary identifier (RNTI), and the received SFI index can indicate which preconfigured slot format combination the UE is to apply for a preconfigured period of time. The DL scheduling assignment (DCI format 0_0 / 0_1) or UL grant (DCI format 1_0 / 1_1) received in each slot can further reassign the flexible symbols as DL or UL. For example, when a UE receives DCI format 1_1 in a slot where PDSCH is scheduled at an existing flexible symbol, the UE can treat the symbol as a DL symbol (only in that slot) and receive the scheduled PDSCH accordingly.

[0080] When a symbol is assigned as a DL or UL symbol by a cell-specific slot format configuration, the symbol may not be reassigned semi-statically or dynamically by a UE-specific slot format configuration. In addition, when a symbol is assigned as a DL or UL symbol by a UE-specific semi-static configuration, the symbol may not be reassigned by a UE-specific dynamic slot format configuration or by scheduling DCI. Basically, reassignment can only be applied to flexible symbols. Both semi-static and dynamic UE-specific slot format configurations supported by NR for reassigning such flexible symbols can provide efficient time resource allocation suitable for UE-specific service types and business modes.

[0081] As disclosed herein, the LTE V2X time resource granularity for SL operation may be based on one subframe. In a TDD system, an LTE V2X UE may determine the SL subframe pool based solely on the UL subframes assigned in the cell-specific DL / UL configuration. The resulting SL time resource granularity and pattern (e.g., subframe pool) is common to the UEs and does not lead to ambiguity regarding the SL transmission duration (i.e., TTI) and transmission instance (i.e., the start of the TTI), which may be the start of a subframe in an LTE system.

[0082] UE-specific SL TTIs may not match, and SL transmissions between UEs may not be aligned. In NR systems, NR V2X UEs may determine SL time resources based on UE-specific time resources and slot format configurations, as discussed herein with respect to NR Uu resource configurations. NR V2X use cases may impose stricter latency requirements than LTE V2X use cases, and therefore NR V2X UEs may use smaller SL time resource granularity, such as by symbol rather than slot or TTI. In addition, NR V2X UEs may use flexible symbols for SL operations to increase transmission and scheduling instances. As a result, two NR V2X UEs may not be able to communicate with each other due to TTI mismatch and / or misaligned transmission instances. For example, an NR V2X UE may transmit using a 4-symbol TTI, while another UE using a single slot TTI may not be able to receive the transmission. In addition, due to different slot format configurations indicated in the SFI, two NR V2X UEs using a 4-symbol TTI may use different starting symbols as the start of the SL TTI, and SL transmissions between the two UEs may not be aligned. Therefore, a new mechanism with configuration flexibility and low signaling overhead is disclosed, which can achieve coordination of SL transmission time resource allocation between NRV2X UEs (which determine the time resources based on UE-specific configuration).

[0083] SL time resources may experience fragmentation and may result in inefficient resource utilization. Since NR V2X UEs apply different SL transmission granularities and modes, resource utilization of SL transmissions may become fragmented in the time domain, especially for SL transmission modes without central network scheduling (e.g., a mode equivalent to LTE SL transmission mode 4). In this transmission mode, the NR V2X UE may autonomously select time and frequency resources and schedule its SL transmissions based on its own sensing results in terms of resource availability in the time and frequency domains. The LTE V2X sensing algorithm may be based on a fixed candidate time resource of one subframe as disclosed herein. Therefore, the time resource availability is always evaluated based on a subframe, and the transmission of each LTE V2X UE occupies a time resource with a uniform granularity of one subframe.

[0084] NR V2X UEs may have UE-specific sensing and transmission granularity, and SL transmissions of different NR V2X UEs may occupy non-contiguous time domain resources of different lengths, such as non-contiguous time domain resources of one slot or multiple symbols. SL transmission modes with central network scheduling (e.g., SL transmission modes equivalent to LTE SL transmission mode 3) may have better reliability and lower latency because the network knows the time resource configurations of all NR V2X UEs and may align them in the time domain scheduling, for example, by filling the slots with non-slot-based SL transmissions of different durations. However, for SL transmission modes without central network scheduling, new mechanisms are needed to achieve such efficient utilization of time resources.

[0085] The UE may determine STRBs for SL operations including transmission, reception, and sensing based on received semi-static and / or dynamic UE slot format configurations. The UE may determine cell-specific STRBs based on the semi-static UE slot format configuration received in a system information broadcast (SIB) transmission. The UE may determine UE-specific STRBs based on the semi-static UE slot format configuration received in RRC signaling and / or a dynamic UE slot format configuration indicated in the SFI in DCI format 2_0 in the GC-PDCCH.

[0086] According to various network implementations, the UE may determine slot-based and / or symbol-based STRBs based on scheduled UL symbols and / or flexible symbols. The UE may determine slot-based STRBs, which may include slots containing all UL symbols (i.e., uplink slots), slots containing all flexible symbols, and / or slots containing both UL symbols and flexible symbols. The UE may determine symbol-based STRBs, which may include multiple consecutive uplink symbols, flexible symbols, and / or flexible and uplink symbols. According to various implementations, the minimum number of symbols of a STRB may be based on the UE's capability in terms of the time required to decode the SL control information, for example, the minimum reception duration. The UE may determine a STRB set that includes STRBs of different characteristics as summarized in Table 1 below. Flexible symbols assigned in one or more SIBs may be considered UE-specific because they may be reassigned as DL or UL symbols via UE-specific signaling. Using a common representation of STRBs reduces the signaling between NR V2X UEs required to communicate different UE-specific SL time resource configurations and the STRB attributes used by each UE.

[0087]

[0088] The UE may determine one STRB as the minimum time resource unit for SL transmission, reception, and sensing. For example, the UE may send and receive one transport block in one cell-specific and slot-based STRB (i.e., one slot SL TTI). In another example, the UE may use one UE-specific and symbol-based STRB as one TTI for SL operation. The UE may perform sensing on a per-STRB basis using a sensing STRB, which may be different from the STRB used for transmission and reception.

[0089] Figure 2 15kHz SCS and 5ms DL / UL transmission period are used to illustrate the disclosed exemplary time slot format configuration and the resulting STRB. The UE may receive a cell-specific DL / UL configuration that assigns a DL time slot at the beginning of a DL / UL transmission period, a number of DL symbols, flexible symbols and UL symbols, and a UL time slot at the end of a transmission period. The UE may then receive the time slot format configuration in RRC signaling and an SFI in DCI 2_0, where the SFI reassigns the flexible symbols as DL or UL symbols. The UE may update and determine the STRB set based on the received RRC signaling (semi-statically) and / or the SFI in the GC-PDCCH (dynamically).

[0090] The UE may determine the set of STRB pools based on the disclosed STRB attributes and SL time resource configuration, such as Figure 2 The SL time resource configuration may provide a set of rules for STRB pool determination. The set of rules may include a rule whereby the UE may determine a cell-specific STRB pool using UL slot-based STRBs and / or UL symbol-based STRBs based on the UL symbols assigned in the slot format configuration received in the SIB, for example, Figure 2 STRB pool 1 (210) and STRB pool 2 (220) in.

[0091] The rule set may include a rule that the UE may determine a UE-specific STRB pool (e.g., Figure 2 STRB pool 3 (230) and STRB pool 4 (240) in .

[0092] The rule set may include rules that the UE may determine a UE-specific STRB pool using UL slot-based STRBs, flexible slot-based STRBs, UL symbol-based STRBs, and / or flexible symbol-based STRBs based on UL symbols and / or flexible symbols assigned and / or reassigned in a slot format configuration received in an SFI, RRC signaling, and / or SIB in DCI format 2_0. This Figure 2 For example, STRB pool 5 (250) and STRB pool 6 (260) are shown in FIG.

[0093] The rule set may include a rule that the UE determines a UE-specific STRB pool using flexible slot-based STRBs and / or flexible symbol-based STRBs based on flexible symbols assigned in a slot format configuration received in an SFI, RRC signaling, and / or SIB in DCI format 2_0.

[0094] The rule set may include a rule that the UE determines the STRB duration of a symbol-based STRB pool based on a configured set of STRB durations, such as 2 symbols, 4 symbols, 7 symbols, and 1 time slot durations. The STRB duration configuration may be based on UE capabilities and / or SL service types supported by the UE.

[0095] The rule set may include a rule that the UE is configured with a set of STRB starting positions (e.g., symbol indexes) for symbol-based STRBs. For example, the UE may assign two 7-symbol STRBs (252 and 262) with starting positions of symbol 0 (262) and symbol 7 (252), such as Figure 2 The STRB pools 5 (250) and 6 (260) in FIG. 1 are shown. The STRB starting position configuration ensures that the symbol-based STRB does not straddle two consecutive time slots. It can also reduce the misalignment of the symbol-based STRB between NR V2X UEs.

[0096] The rule set may include a rule that the UE is configured with a bitmap associated with the slot format configuration, and each bit in the bitmap indicates whether a time resource (e.g., a time slot and / or a symbol and / or a STRB) is available for SL operation. The UE may assign a time resource indicated as available for the STRB pool.

[0097] The UE may select a SFN cycle of 1024 frames as follows during each STRB pool period (e.g., over one SFN cycle of 1024 frames). Figure 2As depicted in , the STRBs assigned to one STRB pool are arranged in increasing order of STRB index. The UE may update the UE-specific STRBs and STRB pool upon receiving the slot format configuration in RRC signaling and / or the SFI in DCI 2_0 in GC-PDCCH.

[0098] In another embodiment, the UE may be configured with a set of SL BWPs, each SL BWP having an associated digital configuration. The UE may be configured with a set of subchannels in each SL BWP, and the subchannel configuration may include the number of RBs and the starting RB index. The UE may determine a set of SLBWPs to be associated with one or more STRB pools based on one or more STRB characteristics. According to one embodiment, the UE may determine a set of SL BWPs that do not overlap with any configured UL BWPs for UL slot-based STRBs and / or UL symbol-based STRBs (e.g., based on a network configuration). This may help avoid in-device interference between the UE's UL and SL transmissions.

[0099] The UE may determine a set of SL BWPs that partially or completely overlap with the UL BWPs for flexible slot-based STRBs and / or flexible symbol-based STRBs. Since no UL transmissions may be scheduled during such STRBs, the UE may apply SL BWPs with large bandwidths to high-throughput applications. When the UE starts SL transmissions in a STRB associated with a different SL BWP, the UE may switch SL BWPs. Figure 3 As shown, the UE may apply a large SL BWP (301) in a flexible symbol-based STRB and autonomously switch to another SL BWP (302) in a UL symbol-based STRB. The UE may switch (310) to a SL BWP (302) that does not overlap with a UL BWP (303) applied to UL transmissions during the UL symbol-based STRB. The UE may switch back (312) to the SL BWP 301 after the UL symbol-based STRB.

[0100] According to an embodiment, the UE may be configured with a PSCCH frequency resource allocation that may be associated with each SL BWP. This may be configured by the network. According to another embodiment, the UE may be configured with a PSCCH frequency resource allocation that is independent of the SL BWP configuration, for example, each SL BWP may include the same PSCCH frequency resource allocation. Again, this may be configured by the network.

[0101] The UE can also switch SL BWP based on the sensing results. For example, the UE can perform wideband energy measurement of the SL BWP, such as measuring and evaluating the BWP received signal strength indicator (RSSI), and switch to another SL BWP when the measured metric exceeds a pre-configured threshold. This can reduce the processing and time required to perform sensing for each subchannel of each SL BWP.

[0102] In one embodiment, the UE may determine a transmission STRB pool from the group of STRB pools for one or a group of supported SL service types and applications based on relevant requirements for latency, reliability, range, etc. For example, the UE may determine a symbol-based transmission STRB pool for low-latency transport blocks. The UE may determine a transmission STRB pool based on flexible time slots for data transmission of large transport blocks with relaxed latency requirements, because time slots may provide more time resources, and the large SL BWP associated with flexible time slot-based STRBs may allow more frequency resources for the transmission of large transport blocks. The UE may determine a transmission STRB pool based on both UL symbols and flexible symbols to increase the number of STRBs available in each STRB pool period, for example, to achieve high reliability and / or a longer range by using repeated transmissions and / or beamforming. As further disclosed herein, the UE may select a transmission STRB pool that is different from a transmission STRB pool for sensing (sensing STRB pool).

[0103] According to one embodiment, the UE may dynamically determine a transmission STRB for a transmission packet (TB) from a transmission STRB pool based on one or more of: the priority of the TB (including the size of the TB), the latency requirement of the TB, the reliability requirement of the TB, the range requirement, the beamforming configuration and / or candidate STRBs determined by UE sensing, as described herein.

[0104] The UE may select a transmission STRB from at least one candidate STRB within the SL transmission window based on the latency, reliability and / or range requirements discussed above. The at least one candidate STRB may be a STRB determined as an available time resource based on UE sensing. The UE may determine the SL transmission STRB from a single candidate STRB, multiple consecutive candidate STRBs and / or non-adjacent candidate STRBs. The determination may be based on one or more of the preconfigured rules described herein, including the priority of the scheduling TB, latency and / or reliability requirements, range settings, beamforming configurations, etc.

[0105] As an example, Figure 4As shown, the UE may select a first candidate STRB for TB1 transmission (denoted as candidate STRB (401)) from the symbol-based STRB pool based on sensing in the SL transmission window (410). According to one embodiment, the UE may multiplex multiple transmission STRBs for different types of SL transmissions. The UE may support transmission of multiple types of data, for example, transmission of data with different latency requirements. For example, still referring to Figure 4 , the UE may determine the symbol-based transmission STRB pools (TB1 (411) and STRB pool 1 (412))) for TBs associated with low latency transmission and the slot-based transmission STRB pools (TB2 (421) and STRB pool 2 (422))) for TBs associated with high latency transmission. The UE may determine the symbol-based transmission STRB pools (TB1 (411) and STRB pool 1 (412))) for TBs associated with low latency transmission and the slot-based transmission STRB pools (TB2 (421) and STRB pool 2 (422))) for TBs associated with high latency transmission. Figure 4 The UE may determine the transmission STRBs for TB1 and TB2 based on the candidate STRBs (401) within the SL transmission window shown. The UE may determine the sensing STRBs as candidate STRBs for transmission based on the sensing results. The UE may reserve the slot-based STRBs for TB2 transmission in the SCI transmitted in the PSSCH associated with the TB1 transmission in the symbol-based STRBs.

[0106] According to one embodiment, the UE may determine the spatial domain transmission filter (i.e., beamforming) configuration based on data type, priority, reliability, and coverage. In one example, the UE may use a cell-specific STRB pool for high-reliability data transmission, applying a wide or omni-directional beam pattern for broadcast transmission. In another example, the UE may apply beamforming to extend the transmission coverage, and thus use beam scanning to repeat the data transmission in each beam.

[0107] According to an embodiment, the UE may apply a spatial domain transmission filter configuration on a per-STRB basis, i.e., one beam per STRB. The UE may be configured with multiple consecutive STRBs in a transmission window, which may be used for beam scanning of one TB. The UE may apply a beam scanning transmission of one TB based on the UE beamforming capability (e.g., the number of spatial domain transmitter filters supported by the UE) and based on the availability of sensed candidate STRBs. In one example, the UE may adjust the spatial domain transmission filter configuration based on the number of candidate STRBs in the transmission window, such as increasing or decreasing the beam width. Therefore, when the number of candidate STRBs varies in each SL transmission window, the UE can provide considerable spatial coverage, such as for broadcast transmissions.

[0108] In another embodiment, now refer to Figure 5, the UE can utilize the segmented SL time resources and reselect the transmission STRB pool, for example, from a slot-based transmission pool to a symbol-based transmission pool, or vice versa. Figure 5 As shown, when no suitable slot-based candidate STRB is available in the SL transmission window due to time resource segmentation, the UE can adjust the transmission of TB2 using the slot-based STRB pool and instead select a transmission STRB from the symbol-based transmission pool. Therefore, the UE can use two 7-symbol-based STRBs from the symbol-based STRB pool to split the slot-based TB2 transmission into two transmissions (510 and 520). This can allow the TB2 transmission to occur in the transmission window, thereby meeting the latency requirements of TB2. The UE can indicate in the SCI that due to STRB pool reselection or TB repetition as described above, multiple STRBs can be used for the transmission of a single TB to provide time diversity. In another variation, the UE can use more frequency resources in the same transmission STRB pool instead of using multiple transmission STRBs.

[0109] According to another embodiment, the UE may apply beam scanning in non-contiguous STRBs, which may occur, for example, when the UE may not have enough candidate STRBs in one SL transmission window. Figure 5 The UE may indicate in the SCI: resource reservation for the same TB with different spatial domain transmission filter configurations. Figure 5 An example of SL transmission of one TB using beam scanning on non-contiguous STRBs (530) is shown in FIG. Figure 4 An example of SL transmission of one TB using beam scanning on consecutive STRBs (430) is shown in FIG.

[0110] In one embodiment, a UE may be configured with a set of PSCCH transmission instances in each time slot for the determined STRB pool. The configuration may include the starting symbol and number of symbols of the PSCCH transmission instance. The UE may send a PSCCH on a per STRB basis according to the configured PSCCH transmission instance based on the selected STRB pool. In one example, the UE may be configured with a PSCCH transmission instance, which may be determined by Figure 6 The slot-based STRB pools for UE1 (610) and UE2 (620) are shown to consist of a number of symbols at the beginning of each slot.

[0111] In one embodiment, reference Figure 6 , the UE may determine the N PSCCH transmission instances in each time slot based on the STRB duration. For example, the UE may determine Figure 62 PSCCH transmission examples at symbol 0 (601) and symbol 7 (602) in each time slot based on a 7-symbol STRB pool for UE3 (630), UE4 (640), UE5 (650) and UE6 (660) are shown in FIG.

[0112] The UE may be configured with PSSCH frequency resource allocation in each BWP, e.g. Figure 6 UE2 (621), UE3 (631) and UE6 (661) shown in . The UE may determine the PSCCH frequency resources within the allocation based on the selected transmit STRB pool and the sensing results. In another example, the UE may be configured to transmit the PSCCH in a frequency resource allocation adjacent to the associated PSSCH, for example, Figure 6 UE1 (611), UE4 (641) and UE5 (651) shown in FIG.

[0113] The UE may determine the frequency resource allocation, such as the number of RBs, based on the duration of the corresponding PSCCH transmission instance. For example, the UE may determine that for a PSCCH transmission instance of one symbol, more RBs are used than for a PSCCH transmission instance of two symbols. By adjusting the frequency resource allocation, the UE may ensure that the power spectral density of the PSCCH symbol does not change with the duration of the PSSCH transmission duration.

[0114] The UE may determine its SCI carried in the PSCCH, which may include STRB information, such as an indication of a slot-based STRB or a symbol-based STRB, the duration of the STRB (in terms of the number of symbols), and / or multi-STRB scheduling information for TB repetition and for multiple STRBs for one TB transmission (including the time interval between these STRBs). The PSCCH may include PSSCH time resource information, such as a PSSCH start symbol index, an offset (in terms of the number of symbols between the last PSCCH symbol and the first PSSCH symbol), a PSSCH duration (in terms of symbols), and / or a PSSCH slot index. The PSCCH may include PSSCH frequency resource information, such as an SL BWP indication and / or a frequency resource location for an initial transmission. The PSSCH may include a PSSCH beamforming configuration, such as an indication of beam scanning, a single wide or omnidirectional beam, a beam indication based on a PSSCH QCL relationship with an SL beam reference signal, and / or an associated PSCCH SL synchronization or DMRS. The PSCCH may include PSSCH data information, such as a service type indication, and / or data priority information. The PSCCH may include a PSSCH transmission format, such as a modulation and coding scheme (MCS), and / or a frequency resource location for an initial transmission. The PSCCH may include PSSCH retransmission information, such as a time gap between an initial transmission and a retransmission, and / or a frequency resource location for a retransmission. The PSCCH may include resource reservation information for the next TB transmission, such as a reservation indication of a time interval between a transmitted STRB and a reserved STRB, a reservation indication of a property of a reserved STRB (including a duration), a reservation indication that the next TB is the same TB for beam scanning using a different beam, and / or a reservation indication of a block with consecutive STRBs (including the number of blocks). The PSCH may include a PSSCH target identifier, such as UE identification information for unicast transmission, and / or service identification information.

[0115] The UE may generate an SCI specific to each data application being run by the UE. For example, one SCI format may be generated for low-latency services, and another SCI format may be generated for large TB transmissions.

[0116] According to another embodiment, when the UE may receive DCI format 0_0 or DCI format 0_1 ​​for scheduling UL transmission overlapping with the above-selected transmission STRB in the time domain, the UE may determine priority processing. This may occur when the transmission STRB is based on UL symbols and flexible symbols. Additionally or alternatively, when the UE may receive DCI format 1_0 or DCI format 1_1 for scheduling DL reception overlapping with the above-selected transmission STRB in the time domain, the UE may determine priority processing. This may occur when the transmission STRB is based on flexible symbols.

[0117] When the UL transmission or DL ​​reception is slot-based and overlaps with slot-based STRB or symbol-based STRB, such as slot-based UL grant and symbol-based STRB, slot-based UL grant and slot-based STRB located in the same slot, the UE may be configured with a priority threshold for priority handling between SL operation and Uu operation.

[0118] When the UL transmission or DL ​​reception is symbol-based and completely overlaps with the transmission STRB, for example, using the same symbol set, the UE may be configured with a priority threshold for priority handling between SL operation and Uu operation. When the priority of the SL TB to be transmitted in the selected transmission STRB is lower than the configured threshold, the UE may cancel the SL transmission and perform the scheduled UL transmission or DL ​​reception. When the priority of the SL TB to be transmitted in the selected transmission STRB is higher than the configured threshold, the UE may not perform the UL transmission or DL ​​reception and continue with SL transmission.

[0119] When the UL transmission or DL ​​reception is symbol-based and partially overlaps with a symbol-based transmission STRB (e.g., overlaps on one or more symbols), the UE may be configured with a priority threshold for priority handling between SL operation and Uu operation. The UE may determine whether it can reselect one or more SL transmission STRBs from the same or another transmission STRB pool, which are indicated as candidate STRBs. The UE may apply puncturing or rate matching to transmit the scheduled SLTBs in non-overlapping symbols and continue both SL transmission and UL transmission / DL reception via the Uu interface. The UE may include information about the adjusted transmission in the SCI in the PSCCH. When STRB reselection and TB transmission adjustment are not available, the UE may cancel the SL transmission and perform the UL transmission or DL ​​reception as scheduled when the priority of the SL TB to be transmitted in the selected transmission STRB may be lower than the configured threshold. Alternatively or additionally, when STRB reselection and TB transmission adjustment may not be available, the UE may not perform the UL transmission or DL ​​reception, and continue the SL transmission when the priority of the SL TB to be transmitted in the selected transmission STRB is higher than a configured threshold.

[0120] According to one embodiment, the UE may determine candidate resources for SL transmission based on time resources (e.g., sensing available STRBs in a STRB pool), frequency resources (e.g., SL BWP, available subchannels within a SL BWP, the location of an RB bundle or RB), and / or spatial resources (e.g., spatial domain transmission filter configuration and frequency resource location for a direction associated with the candidate STRB).

[0121] The UE may be configured to perform sensing at a periodicity, such as a SFN cycle, to determine the candidate resources. The UE may continuously perform sensing in each sensing period, and the sensing based on the UE STRB may include determining a sensing STRB pool.

[0122] When UE beamforming based sensing is configured, UE STRB based sensing may include determining the UE spatial domain receiver filter configuration. The UE may determine an integer number of sensing STRB pools within the configured sensing period to enable receiver beam scanning for monitoring. The UE may also determine such configuration based on the SL service type and / or data application. For example, for high reliability SL data transmission, the UE may determine to use a wide or omnidirectional beam.

[0123] UE STRB based sensing may include determining frequency resource locations for monitoring both PSCCH and PSSCH based on configuration regarding UE SL resource determination.The UE may determine one or more SL BWPs for sensing and may switch BWPs based on per-BWP energy measurements and preconfigured thresholds.

[0124] UE STRB based sensing may include monitoring and decoding the PSCCH in each sensing STRB of the sensing STRB pool, and upon detecting the PSCCH, obtaining measurements of the SCI content and signal quality metrics of the associated PSSCH, such as RSCP, RSSI, SNR, etc.

[0125] Sensing based on UE STRB may include: determining candidate resources based on information from SCI, the information including the transmission of STRB information, PSSCH frequency resource location, PSSCH beam scanning indication, priority of detected PSSCH data and / or resource reservation indication. The determination of candidate resources may be based on the measured relevant PSSCH signal quality and / or information of scheduled SL transmission, including the priority of the scheduled TB, the reliability required for the scheduled TB, the delay required for the scheduled TB and / or the spatial domain transmission filter configuration.

[0126] The UE may perform this determination in each sensing STRB in which PSCCH decoding is successful. In another example, the UE may perform this determination in one sensing STRB, and based on the SCI information, the UE may determine whether a set of subsequent sensing STRBs may be candidate STRBs without processing the SCI information of those sensing STRBs. For example, when the UE detects an indication of resource reservation for TB duplication within a sensing period, the UE may exclude the indicated STRBs from the candidate STRBs without further processing these STRBs. In another example, when the UE detects a beam scanning indication, it may exclude the indicated scanning STRBs for scanning from the candidate STRBs without processing these STRBs.

[0127] The UE can determine the STRB pool for SL sensing and reception based on the attributes of the supported SL service types and applications, including data priority, latency requirements, reliability requirements, beamforming configuration and / or the minimum STRB duration supported by the determined STRB pool. As an example, the UE can determine a sensing STRB pool with a minimum STRB duration based on both UL symbols and flexible symbols, for example, a 2-symbol-UL-flexible symbol-based STRB pool for SL reception. The benefit of this can be that the UE is able to receive low-latency data required by the supported SL service types and applications. Sensing using the minimum STRB duration can provide sufficient granularity to allow the UE to more flexibly select a transmission STRB pool. The UE can determine a transmission STRB from a transmission STRB pool, which may have a different STRB duration from the sensing STRB pool.

[0128] The UE may be configured with a set of PSCCH frequency resource locations for each configured SL BWP and associated with a PSCCH transmission instance. The UE may perform blind decoding of the SCI based on a combination of the PSCCH transmission instance and the PSCCH frequency resource location. For example, the UE may decode the SCI in two PSCCH transmission instances starting at symbol 0 and symbol 7 of each slot based on a 7-symbol based STRB sensing pool, and in each transmission instance, the UE may search for the SCI in the associated frequency resource locations. The association between PSCCH transmission instances and frequency resource locations may allow different SCI formats to be distributed in different PSSCH resources to reduce congestion and processing. For example, for a PSSCH transmission opportunity starting at symbol 0, the UE may be configured with a separate PSCCH frequency resource location for SCI transmission based on a symbol-based or slot-based STRB pool.

[0129] The UE may be configured with an SCI format associated with the PSCCH transmission instance and / or PSCCH frequency resource location. Thus, the UE may determine which SCI to detect based on the PSCCH transmission instance and / or PSCCH frequency resource location. To limit UE processing, a UE may be configured with a maximum number of PSCCHs to decode in each PSCCH transmission instance associated with the UE's transmission and / or sensing STRB pool.

[0130] According to one embodiment, a UE in a SL unicast transmission may send an SCI that can only be decoded by another UE based on the UE identification and / or service identification information in the SCI. For example, a UE may transmit a PSCCH with scrambling configured with such unicast-specific information. Therefore, the unicast PSCCH may not be decoded by all neighboring UEs receiving the transmission.

[0131] To enable sensing on the unicast transmission, the unicast UE may send a non-unicast transmission specific DMRS of the PSCCH so that the UE may obtain a signal measurement of the DMRS, but may not use the signal measurement to decode the PSCCH. Alternatively or in addition, to enable sensing on the unicast transmission, the unicast UE may send a unicast specific SL synchronization signal (SLS) and / or a unicast sensing signal (USS) indicating an ongoing unicast transmission, for example, a ZC sequence with parameters such as a cyclic shift and / or sequence index pre-configured for the unicast transmission. The UE may send the signal without an associated PSCCH and / or PSSCH.

[0132] The UE may be configured with resource reservation information associated with certain parameters of the PSCCH DMRS / SLSS / USS. The information may include resource reservation intervals, STRB information, and / or frequency resource locations. For example, the UE may select a sequence with a PSCCH DMRS / SLSS / USS, which may indicate the reservation interval. In addition, the PSCCH DMRS / SLSS / USS frequency resource location may be configured to be the same as the reserved transmission. The UE may be configured with a mapping between STRB information and PSCCH DMRS / SLSS / USS parameters (e.g., sequence type, sequence index, and / or cyclic shift).

[0133] Therefore, the UE can perform sensing of unicast transmissions based on the energy measured on the detected PSCCH DMRS / SLSS / USS. When the UE detects such a sequence in a sensing STRB, if the energy measured on the detected signal may exceed a pre-configured threshold, the UE can exclude the SL resources implicitly indicated by the parameters of the detected PSCCH DMRS / SLSS / USS from the candidate STRBs.

[0134] refer to Figure 6, a method flow chart of an embodiment is shown. The method 600 starts when a vehicle-to-everything (V2X) user equipment (UE) configured to operate in a fifth generation (5G) wireless network determines, at step 605, a symbol-based resource pool for SL transmission to another V2X UE. At step 610, the V2X UE also determines a slot-based resource pool for sidelink transmission to another V2X UE. The V2X UE may implement steps 605 and 610 using any of the disclosed methods described herein. At step 615, the V2X UE performs measurements on the symbol-based resource pool and the slot-based resource pool to determine available resources. At step 620, the V2X UE determines which available resources are candidate resources that can be selected for data transmission based on a quality of service (QoS) 617 associated with the data for transmission. At step 625, the V2X UE determines whether the candidate resources of the first resource pool (i.e., the slot-based resource pool or the symbol-based resource pool) are sufficient for the QoS of the data for transmission. If the candidate resources in the first resource pool are sufficient for the QoS requirement of the data to be transmitted, then in step 630, the first resource pool is used to transmit the data. If the candidate resources in the first resource pool do not meet the QoS of the transmitted data, the V2X UE selects a second resource pool (i.e., a symbol-based resource pool or a slot-based resource pool, respectively) for transmitting the data, wherein the second resource pool resources meet the QoS of the transmitted data. Although the features and elements in a specific combination are described above, it will be appreciated by a person of ordinary skill in the art that each feature or element can be used alone or in any combination with other features and elements. In addition, the methods described herein can be implemented in a computer program, software, or firmware that is introduced into a computer-readable medium for execution by a computer or processor. Examples of computer-readable media include electronic signals (which are transmitted via a wired or wireless connection) and computer-readable storage media. Examples of computer-readable storage media include, but are not limited to, read-only memory (ROM), random access memory (RAM), registers, buffer memory, semiconductor storage devices, magnetic media (such as internal hard disks and removable disks), magneto-optical media, and optical media (such as CD-ROM discs and digital versatile discs (DVDs)). A processor in association with software may be used to implement a radio frequency transceiver for use in a WTRU, UE, terminal, base station, RNC, or any host computer.

Claims

1. A vehicle-to-everything (V2X) user equipment (UE) for operating in a fifth generation (5G) wireless network, the UE comprising: transceiver; as well as a processor configured to determine a symbol-based resource pool and a slot-based resource pool for a sidelink (SL) transmission to another V2X UE; The processor and transceiver are configured to perform measurements of the symbol-based resource pool and the slot-based resource pool to determine available resources; as well as The processor is configured to determine which available resources are candidate resources that may be selected for transmission of the data based on a quality of service (QoS) associated with the data for transmission.

2. The V2X UE of claim 1, wherein the symbol-based resource pool for SL transmission to another V2X UE includes both uplink (UL) symbols and flexible symbols.

3. The V2X UE of claim 1 , wherein the slot-based resource pool for SL transmission to another V2X UE includes both uplink (UL) slots and flexible slots.

4. The V2X UE of claim 1 , wherein the processor is configured to determine a symbol-based resource pool and a slot-based resource pool for a sidelink (SL) transmission to another V2X UE based on a slot format indicator received in a radio resource control (RRC) message.

5. The V2X UE of claim 1 , wherein the processor is configured to determine a symbol-based resource pool and a slot-based resource pool for a sidelink (SL) transmission to another V2X UE based on a slot format indicator received in a group common physical downlink control channel (GC-PDCCH).

6. The V2X UE according to claim 1, wherein under the condition that the processor determines, based on the measurement, that available resources of the symbol-based resource pool cannot satisfy the QoS associated with the data for transmission, the processor is configured to select available candidate resources from the time slot-based resource pool for transmission of the data.

7. The V2X UE according to claim 1, wherein under the condition that the processor determines, based on the measurement, that available resources of the time slot-based resource pool cannot meet the QoS associated with the data for transmission, the processor is configured to select available candidate resources from the symbol-based resource pool for transmission of the data.

8. A method for use in a vehicle-to-everything (V2X) user equipment (UE) for operation in a fifth generation (5G) wireless network, the method comprising: Determining a symbol-based resource pool and a slot-based resource pool for sidelink (SL) transmission to another V2X UE; performing measurements on the symbol-based resource pool and the slot-based resource pool to determine available resources; as well as determining, based on a quality of service (QoS) associated with data for transmission, which available resources are candidate resources that may be selected for transmission of the data; as well as The data is sent using the selected candidate resource.

9. The method of claim 8, wherein the symbol-based resource pool for SL transmission to another V2X UE includes both uplink (UL) symbols and flexible symbols.

10. The method of claim 8, wherein the slot-based resource pool for SL transmission to another V2X UE includes both uplink (UL) slots and flexible slots.

11. The method of claim 8, wherein the determining a symbol-based resource pool and a slot-based resource pool for a sidelink (SL) transmission to another V2X UE is based on a slot format indicator received in a radio resource control (RRC) message.

12. The method of claim 8, wherein the determining a symbol-based resource pool and a slot-based resource pool for sidelink (SL) transmission to another V2X UE is based on a slot format indicator received in a group common physical downlink control channel (GC-PDCCH).

13. The method of claim 8, wherein under the condition that, based on the measurement, available resources in the symbol-based resource pool cannot satisfy the QoS associated with the data for transmission, available candidate resources are selected from the time slot-based resource pool for transmission of the data.

14. The method of claim 8, wherein under the condition that, based on the measurement, available resources in the time slot-based resource pool cannot meet the QoS associated with the data for transmission, available candidate resources are selected from the symbol-based resource pool for transmission of the data.

Images