Communication apparatus and communication method using reserved resources

Abstract

The present disclosure provides a communication apparatus and a communication method for utilizing a released resource. The communication apparatus includes a communication apparatus comprising: a receiver configured to receive, from another communication apparatus, release information related to a reserved resource, the reserved resource being reserved for a transmission from another communication apparatus; and a circuitry configured to select, when the communication apparatus is to make a subsequent transmission, a resource from a plurality of resource candidates, wherein the plurality of resource candidates comprises the reserved resource.

Description

Technical Field

[0001] The following disclosure relates to communication apparatus and methods for new radio (NR) communications, and more specifically, to communication apparatus and methods for utilizing reserved resources, especially resources that are reserved but not used. Background Technology

[0002] V2X communication allows vehicles to interact with public roads and other road users, and is therefore considered a key factor in making autonomous vehicles a reality.

[0003] To accelerate this process, the 3rd Generation Partnership Project (3GPP) is discussing 5G NR-based V2X communication (interchangeably referred to as NR V2X communication) to identify technical solutions for advanced V2X services, in which vehicles (i.e., interchangeably referred to as communication devices or user equipment (UEs) supporting V2X applications) can exchange their own status information with other nearby vehicles, infrastructure nodes, and / or pedestrians via sidelinks (SL). This status information includes information about location, speed, orientation, etc.

[0004] In such V2X communication, 3GPP is discussing at least two SL resource allocation modes. Under resource allocation mode 1, the SL resources(s) to be used by the UE for SL transmissions are scheduled by the base station (BS). Under resource allocation mode 2, the UE determines (i.e., the BS does not schedule) the SL transmission resources within either the BS / network configured resources or pre-configured SL resources. The 3GPP study on resource allocation also considers the sensing and resource selection process of mode 2(a) within the context of a semi-persistent scheme that selects resources(s) for multiple transmissions across different transport blocks (TBs) and a dynamic scheme that selects resources(s) for each TB transmission.

[0005] The following items were considered at the 3GPP RAN WG1#96b meeting in Xi'an:

[0006] 1. Based on the sensing and resource selection process, NR V2X supports initial transmission of TB without reservation.

[0007] 2. Based on the sensing and resource selection process, NR V2X supports reserving sidelink resources for the initial transmission of a TB, at least through sidelink control information (SCI) associated with different TBs. This function can be enabled / disabled through (pre)configuration.

[0008] 3. Further Research (FFS): Support independent physical-side link control channel (PSCCH) transmission for resource reservation in NR V2X.

[0009] The following items were considered at Reynolds' 3GPP RAN WG1#97 meeting:

[0010] 4. NR V2X Mode-2 supports resource reservation for feedback-based Physical Side Link Shared Channel (PSSCH) retransmissions via signaling associated with previous transmissions of the same TB.

[0011] 1. FFS: Impact on subsequent sensing and resource selection processes.

[0012] 2. At least from the perspective of the transmitter of the above TB, it supports the use of Hybrid Automatic Repeat Request (HARQ) feedback to release (multiple) unused resources.

[0013] However, there has been no discussion of communication devices and methods for utilizing reserved resources that were not used in the initial transmission.

[0014] Therefore, there is a need to provide communication apparatus and methods for utilizing feasible technical solutions of reserved resources. Furthermore, other desirable features and characteristics will become apparent from the following detailed description taken in conjunction with the accompanying drawings and the background of this disclosure, as well as from the appended claims. Summary of the Invention

[0015] Non-limiting and exemplary embodiments help to provide communication devices and methods for utilizing unused reserved resources.

[0016] According to a first embodiment of the present disclosure, a communication device is provided, comprising: a transmitter for transmitting data to a receiving communication device in a first reserved resource among at least two reserved resources, each of the at least two reserved resources being reserved for transmission to the receiving communication device; a receiver for receiving response information indicating whether the transmission of data in the first reserved resource has been successfully received by the receiving communication device; and circuitry for determining the use of a second reserved resource among the at least two reserved resources based on the response information.

[0017] According to a second embodiment of this disclosure, a communication method is provided, comprising: sending data to a receiving communication device in a first reserved resource of at least two reserved resources, each of the at least two reserved resources being reserved for transmission to the receiving communication device; receiving at the communication device response information indicating whether the data in the first reserved resource has been successfully received by the receiving communication device; and determining the use of a second reserved resource of the at least two reserved resources based on the response information.

[0018] It should be noted that general or specific embodiments may be implemented as systems, methods, integrated circuits, computer programs, storage media or any alternative combination thereof.

[0019] Other benefits and advantages of the disclosed embodiments will become apparent from the specification and drawings. Benefits and / or advantages can be obtained individually from the various embodiments and features in the specification and drawings, and it is not necessary to provide all of these embodiments and features to obtain one or more such benefits and / or advantages. Attached Figure Description

[0020] Embodiments of this disclosure will be better understood and apparent to those skilled in the art from the following written description, which is by way of example only and taken in conjunction with the accompanying drawings, wherein:

[0021] Figure 1 An exemplary 3GPP NR-RAN architecture is shown.

[0022] Figure 2 A schematic diagram illustrating the functional division between NG-RAN and 5GC is described.

[0023] Figure 3 A sequence diagram depicting the RRC connection establishment / reconfiguration process is provided.

[0024] Figure 4 The illustration depicts use cases for enhanced mobile broadband (eMBB), massive machine-type communications (mMTC), and ultra-reliable low-latency communications (URLLC).

[0025] Figure 5 A block diagram illustrating an exemplary 5G system architecture for V2X communication in non-roaming scenarios is shown.

[0026] Figure 6 A schematic diagram 600 illustrates how resources can be reserved for future transmissions in V2X communications.

[0027] Figure 7 A schematic diagram 700 illustrates how reserved resources can be utilized according to various embodiments.

[0028] Figure 8 A schematic diagram 800 illustrates how reserved resources can be utilized according to various embodiments.

[0029] Figure 9 The illustration shows how the physical (PHY) layer, according to various embodiments, [is used to] [address / resources]. Figure 7 and Figure 8 The flowchart 900 shown in the figure illustrates the method for performing sensing.

[0030] Figure 10 A flowchart 6000 illustrates how, according to various embodiments, the use of reserved but unused resources is determined in operation A.

[0031] Figure 11A flowchart 1100 illustrates how the use of reserved but unused resources can be determined in operation B according to various embodiments.

[0032] Figure 12 A flowchart 1200 illustrates how the use of reserved but unused resources can be determined in operation C according to various embodiments.

[0033] Figure 13 A flowchart 1300 illustrates how the use of reserved but unused resources can be determined in operation D according to various embodiments.

[0034] Figure 14 A flowchart 1400 illustrates how the use of reserved but unused resources can be determined based on priority according to various embodiments.

[0035] Figure 15 A schematic diagram 1500 illustrates how the use of reserved but unused resources can be determined based on congestion levels according to various embodiments.

[0036] Figure 16 A flowchart 1600 illustrating a communication method according to various embodiments is shown.

[0037] Figure 17 Schematic examples of communication apparatuses according to various embodiments are shown. According to various embodiments of this disclosure, the communication apparatus may be implemented as a UE or gNB / base station and configured to utilize freed resources.

[0038] Those skilled in the art will understand that the elements in the accompanying drawings are illustrated for simplicity and clarity and are not necessarily depicted to scale. For example, the dimensions of some elements in the illustrations, block diagrams, or flowcharts may be exaggerated relative to other elements to aid in understanding the present embodiment. Detailed Implementation

[0039] Some embodiments of this disclosure will be described with reference to the accompanying drawings, which are merely examples. The same reference numerals and characters in the drawings refer to the same elements or equivalents.

[0040] 3GPP has been working on the next version of fifth-generation cellular technology, commonly known as 5G, which includes the development of a new radio access technology (NR) operating in frequencies ranging up to 100 GHz. The first version of the 5G standard was completed at the end of 2017, which allowed for trials and commercial deployment of 5G NR-compliant smartphones.

[0041] The overall system architecture assumes that the gNB's NG-RAN (Next Generation Radio Access Network) provides the UE with NG-Radio Access User Plane (SDAP / PDCP / RLC / MAC / PHY) and Control Plane (RRC) protocol termination. gNBs interconnect with each other via the Xn interface. gNBs also connect to the NGC (Next Generation Core) via the Next Generation (NG) interface, more specifically, to the AMF (Access and Mobility Management Functions) (e.g., specific core entities performing the AMF) via the NG-C interface, and to the UPF (User Plane Functions) (e.g., specific core entities performing the UPF) via the NG-U interface. Figure 1 The diagram illustrates the NG-RAN architecture (see, for example, Section 4 of 3GPP TS 38.300v15.6.0).

[0042] The NR user plane protocol stack (see, for example, Section 4.4.1 of 3GPP TS 38.300) includes PDCP (Packet Data Convergence Protocol, see Section 6.4 of TS 38.300), RLC (Radio Link Control, see Section 6.3 of TS 38.300), and MAC (Media Access Control, see Section 6.2 of TS 38.300) sublayers, which terminate in the gNB on the network side. Furthermore, a new Access Layer (AS) sublayer (SDAP, Service Data Adaptation Protocol) is introduced above PDCP (see, for example, Sub-clause 6.5 of 3GPP TS 38.300). A control plane protocol stack is also defined for NR (see, for example, Section 4.4.2 of TS 38.300). An overview of Layer 2 functions is given in Sub-clause 6 of TS 38.300. The functions of the PDCP, RLC, and MAC sublayers are listed in Sections 6.4, 6.3, and 6.2 of TS 38.300, respectively. The functions of the RRC layer are listed in Sub-clause 7 of TS 38.300.

[0043] For example, the media access control layer handles logical channel multiplexing, scheduling, and scheduling-related functions, including handling different parameter sets.

[0044] The Physical Layer (PHY) is responsible for tasks such as coding, PHY HARQ processing, modulation, multi-antenna processing, and mapping signals to appropriate physical time-frequency resources. It also handles the mapping from transport channels to physical channels. The Physical Layer provides services to the MAC Layer in the form of transport channels. A physical channel corresponds to a set of time-frequency resources used for transmission on a specific transport channel, and each transport channel is mapped to a corresponding physical channel. For example, physical channels are PRACH (Physical Random Access Channel), PUSCH (Physical Uplink Shared Channel), and PUCCH (Physical Uplink Control Channel) for uplink, and PDSCH (Physical Downlink Shared Channel), PDCCH (Physical Downlink Control Channel), and PBCH (Physical Broadcast Channel) for downlink.

[0045] Use cases / deployment scenarios for NR may include enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive machine-type communication (mMTC), each with different requirements in terms of data rate, latency, and coverage. For example, eMBB is expected to support peak data rates (20Gbps downlink and 10Gbps uplink) and user experience data rates that are orders of magnitude higher than those offered by IMT-Advanced (IMT-Advanced). On the other hand, in the case of URLLC, more stringent requirements are placed on ultra-low latency (0.5ms user plane latency for both UL and DL) and high reliability (1-10-5 within 1ms). Finally, mMTC may preferably require high connection density (1,000,000 devices / km² in urban environments), large coverage in harsh environments, and extremely long-life batteries (15 years) for low-cost devices.

[0046] Therefore, a set of OFDM parameters suitable for one use case (e.g., subcarrier spacing, OFDM symbol duration, cyclic prefix (CP) duration, number of symbols per scheduling interval) may not be suitable for another use case. For example, low-latency services may preferably require shorter symbol durations (and therefore larger subcarrier spacing) and / or fewer symbols per scheduling interval (also known as TTI) compared to mMTC services. Furthermore, deployment scenarios with large channel delay spreads may preferably require longer CP durations compared to scenarios with short delay spreads. Subcarrier spacing should be optimized accordingly to preserve similar CP overhead. NR can support more than one subcarrier spacing value. Accordingly, subcarrier spacings of 15kHz, 30kHz, 60kHz… are currently under consideration. Symbol duration Tu and subcarrier spacing Δf are directly related by the formula Δf = 1 / Tu. In a similar manner to LTE systems, the term "resource element" can be used to represent the smallest resource unit consisting of a subcarrier of one OFDM / SC-FDMA symbol length.

[0047] In the new 5G-NR radio system, for each parameter set and carrier, resource grids for subcarriers and OFDM symbols are defined for both uplink and downlink. Each element in the resource grid is called a resource element and is identified based on its frequency index in the frequency domain and its symbol position in the time domain (see 3GPP TS 38.211v15.6.0).

[0048] (Control signal)

[0049] In this disclosure, the downlink control signals (information) related to this disclosure can be signals (information) transmitted through the physical layer PDCCH, or signals (information) transmitted through higher-layer MAC control elements (CE) or RRC. Downlink control signals can be predefined signals (information).

[0050] The uplink control signals (information) related to this disclosure may be signals (information) transmitted via the physical layer PUCCH, or signals (information) transmitted via the higher-layer MAC CE or RRC. Furthermore, the uplink control signals may be predefined signals (information). The uplink control signals may be replaced by uplink control information (UCI), first-level side uplink control information (SCI), or second-level SCI.

[0051] (Base station)

[0052] In this disclosure, for example, a base station can be a Transmitter Receiver Point (TRP), a clusterhead, an access point, a Remote Radio Header (RRH), an eNodeB (eNB), a gNodeB (gNB), a Base Station (BS), a Base Transceiver Station (BTS), a basic unit, or a gateway. Furthermore, in sidelink communication, a terminal may be used instead of a base station. A base station can be a relay device that relays communication between higher nodes and terminals. A base station can also be a roadside unit.

[0053] (Uplink / Downlink / Sidelink)

[0054] This disclosure can be applied to any of the uplink, downlink, and sidelink.

[0055] This disclosure can be applied to, for example, uplink channels (such as PUSCH, PUCCH, and PRACH), downlink channels (such as PDSCH, PDCCH, and PBCH), and sidelink channels (such as Physical Sidelink Shared Channel (PSSCH), Physical Sidelink Control Channel (PSCCH), and Physical Sidelink Broadcast Channel (PSBCH)).

[0056] PDCCH, PDSCH, PUSCH, and PUCCH are examples of downlink control channel, downlink data channel, uplink data channel, and uplink control channel, respectively. PSCCH and PSSCH are examples of sidelink control channel and sidelink data channel, respectively. PBCH and PSBCH are examples of broadcast channels, and PRACH is an example of a random access channel.

[0057] (Data Channel / Control Channel)

[0058] This disclosure can be applied to any data channel and control channel. The channels in this disclosure can be replaced by data channels including PDSCH, PUSCH, and PSSCH and / or control channels including PDCCH, PUCCH, PBCH, PSCCH, and PSBCH.

[0059] (Reference signal)

[0060] In this disclosure, the reference signal is a signal known to both the base station and the mobile station, and each reference signal may be referred to as a reference signal (RS) or sometimes as a pilot signal. The reference signal may be any one of a DMRS, a channel state information-reference signal (CSI-RS), a tracking reference signal (TRS), a phase tracking reference signal (PTRS), a cell-specific reference signal (CRS), and a sounding reference signal (SRS).

[0061] (Time interval)

[0062] In this disclosure, a time resource unit is not limited to one or a combination of time slots and symbols, and can be a time resource unit such as a frame, superframe, subframe, time slot, time slot sub-time slot, micro-time slot, or a time resource unit such as a symbol, orthogonal frequency division multiplexing (OFDM) symbol, single-carrier frequency division multiplexing access (SC-FDMA) symbol, or other time resource units. The number of symbols included in a time slot is not limited to any of the number of symbols exemplified in the above embodiments(s), and can be other number of symbols.

[0063] (frequency band)

[0064] This disclosure can be applied to either licensed or unlicensed frequency bands.

[0065] (communication)

[0066] This disclosure can be applied to any of the following: communication between a base station and a terminal (Uu link communication), communication between terminals (side link communication), and vehicle-to-everything (V2X) communication. The channels in this disclosure can be replaced by PSCCH, PSSCH, Physical Side Link Feedback Channel (PSFCH), PSBCH, PDCCH, PUCCH, PDSCH, PUSCH, and PBCH.

[0067] Furthermore, this disclosure can be applied to any terrestrial network or any network other than a terrestrial network (NTN: non-terrestrial network) that uses satellites or high-altitude pseudo-satellites (HAPS). Additionally, this disclosure can be applied to networks with large cell sizes, and to terrestrial networks with large delays compared to symbol lengths or time slot lengths (such as ultra-wideband transmission networks).

[0068] (Antenna Port)

[0069] An antenna port refers to a logical antenna (antenna array) formed by one or more physical antennas. That is, an antenna port does not necessarily refer to a single physical antenna; sometimes it refers to an array of antennas, such as multiple antennas. For example, there is no defined number of physical antennas forming an antenna port; instead, an antenna port is defined as the smallest unit through which a terminal can transmit a reference signal. An antenna port can also be defined as the smallest unit used for weighted multiplication of precoding vectors.

[0070] Figure 2 The functional partitioning between NG-RAN and 5GC is illustrated. NG-RAN logical nodes are either gNBs or ng-eNBs. 5GC has logical nodes AMF, UPF, and SMF.

[0071] Specifically, gNB and ng-eNB host the following main functions:

[0072] - Functions for radio resource management, such as radio bearer control, radio access control, connection mobility control, and dynamic allocation (scheduling) of resources to UEs in uplink and downlink;

[0073] - Data IP header compression, encryption, and integrity protection;

[0074] - When a route to the AMF cannot be determined from the information provided by the UE, the AMF is selected when the UE is attached;

[0075] - Routing user plane data to (multiple) UPFs;

[0076] - Routing control plane information to AMF;

[0077] - Connection establishment and release;

[0078] - Scheduling and transmission of paging messages;

[0079] - Scheduling and transmission of system broadcast information (originating from AMF or OAM);

[0080] - Configuration for measurement and measurement reporting for mobility and scheduling;

[0081] - Transport layer packet markings in the uplink;

[0082] -Session management;

[0083] -Supports network slicing;

[0084] - QoS flow management and mapping to data radio bearers;

[0085] - Supports UEs in the RRC_INACTIVE state;

[0086] -NAS message distribution functionality;

[0087] - Radio access network sharing;

[0088] -Dual connection;

[0089] -Close interoperability between NR and E-UTRA.

[0090] The Access and Mobility Management Function (AMF) hosts the following key functions:

[0091] -Non-access stratum NAS signaling termination;

[0092] -NAS signaling security;

[0093] - Access layer AS security control;

[0094] - Core network (CN) inter-node signaling for mobility between 3GPP access networks;

[0095] - Idle mode UE reachability (including paging retransmission control and execution);

[0096] -Registered area management;

[0097] -Supports intra-system and inter-system mobility;

[0098] -Access authentication;

[0099] - Access authorization, including checking roaming permissions;

[0100] - Mobility management controls (subscriptions and policies);

[0101] -Supports network slicing;

[0102] -Session Management Function (SMF) selection.

[0103] In addition, the User Plane Function UPF hosts the following main functions:

[0104] - Anchor points for movement within / between RATs (where applicable);

[0105] - External PDU session points for interconnection with data networks;

[0106] - Packet routing & forwarding;

[0107] - User plane components for group checks and policy rule enforcement;

[0108] -Business usage report;

[0109] -Supports uplink classifiers that route service flows to the data network;

[0110] -Supports branching points for multi-host PDU sessions;

[0111] - QoS processing in the user plane, such as packet filtering, gating, and UL / DL rate implementation;

[0112] - Uplink service verification (SDF to QoS flow mapping);

[0113] - Downlink packet buffering and downlink data notification triggering.

[0114] Finally, the session management function SMF hosts the following main functions:

[0115] -Session management;

[0116] -UE IP address allocation and management;

[0117] -Selection and control of UP function;

[0118] - Configure service orientation at the User Plane Function (UPF) to route services to the correct destination;

[0119] - The control portion of policy implementation and QoS;

[0120] - Downlink data notification.

[0121] Figure 3 This illustrates some interactions between the UE, gNB, and AMF (5GC entity) in the context of the UE transitioning from RRC_IDLE to RRC_CONNECTED for the NAS portion (see TS 38.300v15.7.0).

[0122] RRC is a higher-level signaling (protocol) used for UE and gNB configuration. Specifically, this transition involves the AMF preparing UE context data (including, for example, PDU session context, security keys, UE radio capabilities, and UE security capabilities) and transmitting it to the gNB along with an INITIAL CONTEXT SETUP REQUEST. The gNB then activates AS security with the UE, which is performed by the gNB sending a SecurityModeCommand message to the UE and the UE responding with a SecurityModeComplete message. Afterward, the gNB performs reconfiguration by sending an RRCReconfiguration message to the UE, and in response, receives an RRCReconfigurationComplete message from the UE to establish Signaling Radio Bearer 2 (SRB2) and (multiple) Data Radio Bearers (DRBs). For signaling-only connections, the steps related to RRCReconfiguration are skipped because SRB2 and DRBs are not established. Finally, the gNB notifies the AMF that the establishment process is complete with an INITIAL CONTEXT SETUP RESPONSE.

[0123] Figure 4 The diagram illustrates some use cases for 5G NR. Within the 3rd Generation Partnership Project New Radio (3GPP NR), three use cases already envisioned as supporting a wide variety of services and applications by IMT-2020 are being considered. The specifications for Enhanced Mobile Broadband (eMBB) Phase 1 have been finalized. In addition to further expanding eMBB support, current and future work will involve the standardization of Ultra Reliable Low Latency Communication (URLLC) and Massive Machine-Type Communication. Figure 4 The illustrations show some examples of envisioned use cases for IMT in 2020 and beyond (see, for example, ITU-R M.2083). Figure 2 ).

[0124] URLLC use cases have stringent requirements for capabilities such as throughput, latency, and availability, and are envisioned as one of the enablers for future vertical applications such as wireless control of industrial manufacturing or production processes, telemedicine surgery, distribution automation in smart grids, and transportation security. Ultra-reliability of URLLC must be supported by verifying technologies that meet the requirements set forth in TR38.913. For NR URLLC in Release 15, key requirements include a target user plane latency of 0.5 ms for both the UL (uplink) and DL (downlink) parameters. For a packet size of 32 bytes and a user plane latency of 1 ms, the typical URLLC requirement for a packet transmission is a BLER (Block Error Rate) of 1E-5.

[0125] From a physical layer perspective, reliability can be improved in a variety of ways. Current improvements in reliability involve defining a separate CQI table for URLLC, a more compact DCI format, and PDCCH repetition, among others. However, as NR becomes more stable and developed (addressing the critical requirements of NR URLLC), the scope for achieving ultra-reliability may expand. Specific use cases for NRURLLC in Release 15 include augmented reality / virtual reality (AR / VR), eHealth, eSafety, and mission-critical applications.

[0126] Furthermore, the technical enhancements targeted by NR URLLC aim to improve latency and reliability. Latency enhancements include configurable parameter sets, non-slot-based scheduling with flexible mapping, unlicensed (configured license) uplinks, slot-level repetition of data channels, and downlink preemption. Preemption means that a transmission for which resources have already been allocated is stopped, and the allocated resources are used for another transmission that requests them later but has lower latency / higher priority requirements. Thus, an already-allocated transmission is preempted by a later-arranged transmission. Preemption applies regardless of the specific service type. For example, a transmission of service type A (URLLC) may be preempted by a transmission of service type B (such as eMBB). Reliability enhancements include a dedicated CQI / MCS table for the target BLER in 1E-5.

[0127] The use cases for mMTC (massive machine-type communication) are characterized by a very large number of connected devices typically sending relatively small amounts of non-latency-sensitive data. Devices need to be low-cost and have very long battery life. From an NR (Radio Frequency Identification) perspective, utilizing a very narrow bandwidth segment is a possible solution to save power and achieve long battery life from the UE's (User Equipment) perspective.

[0128] As mentioned above, the scope of reliability in NR is expected to become broader. A key requirement across all scenarios, especially for URLLC and mMTC, is high or ultra-high reliability. Several mechanisms can be considered to improve reliability from both radio and network perspectives. Generally, there are several key potential areas that can help improve reliability. These areas include compact control channel information, data / control channel repetition, and diversity in the frequency, time, and / or spatial domains. These areas apply to general reliability regardless of the specific communication scenario.

[0129] For NR URLLC, further use cases with more stringent requirements have been identified, such as factory automation, the transportation industry, and power distribution. The more stringent requirement is higher reliability (up to 10). -6(Level), higher availability, packet size up to 256 bytes, time synchronization in the order of a few μs (where this value can be 1 μs or a few μs, depending on the frequency range), and short latency in the order of 0.5 to 1 ms (especially 0.5 ms target user plane latency, depending on the use case).

[0130] In addition, several technical enhancements from a physical layer perspective have been identified for NR URLLC. These include PDCCH (Physical Downlink Control Channel) enhancements related to compact DCI, PDCCH repetition, and increased PDCCH snooping. Furthermore, UCI (Uplink Control Information) enhancements are related to enhanced HARQ (Hybrid Automatic Repeat Request) and CSI feedback enhancements. PUSCH enhancements related to microslot-level hopping and retransmission / repetition enhancements have also been identified. The term "microslot" refers to a transmission time interval (TTI) that includes fewer symbols than a time slot (a time slot consisting of 14 symbols).

[0131] The 5G QoS (Quality of Service) model is based on QoS flows and supports both QoS flows that require guaranteed flow bit rate (GBR QoS flows) and QoS flows that do not require guaranteed flow bit rate (non-GBR QoS flows). At the NAS level, QoS flows are therefore the finest granularity of QoS distinction in a PDU session. Within a PDU session, QoS flows are identified by the QoS Flow ID (QFI) carried in the encapsulation header on the NG-U interface.

[0132] For each UE, 5GC establishes one or more PDU sessions. For each UE, NG-RAN establishes at least one data radio bearer (DRB) along with the PDU session, and subsequently, additional DRBs for (multiple) QoS flows of that PDU session can be configured (when to do so depends on NG-RAN), for example, as referenced above. Figure 3 As shown, NG-RAN maps packets belonging to different PDU sessions to different DRBs. NAS-level packet filters in the UE and 5GC associate UL and DL packets with QoS flows, while AS-level mapping rules in the UE and NG-RAN associate UL and DL QoS flows with DRBs.

[0133] Figure 5 The diagram illustrates the 5G NR non-roaming reference architecture (see Section 4.2.1.1 of TS 23.287v16.0.0). Figure 4The application functions (AFs) exemplified in the description (e.g., external application servers hosting 5G services) interact with the 3GPP core network to provide services, such as supporting application influence on service routing, access network exposure functions (NEFs), or interacting with policy frameworks for policy control (see Policy Control Functions (PCFs), such as QoS control. Based on operator deployment, application functions considered trusted by the operator may be allowed to interact directly with the relevant network functions. Application functions that the operator does not allow to directly access network functions interact with the relevant network functions via the NEF using an external exposure framework.

[0134] Figure 5 Further functional units of the 5G architecture for V2X communication are illustrated, namely, Unified Data Management (UDM), Policy Control Function (PCF), Network Exposure Function (NEF), Application Function (AF), Unified Data Repository (UDR), Access and Mobility Management Function (AMF), Session Management Function (SMF), and User Plane Function (UPF) in the 5GC, as well as the V2X Application Server (V2AS) and Data Network (DN), such as operator services, internet access, or third-party services. All or part of the core network functions and application services can be deployed and run in a cloud computing environment.

[0135] As stated above, at least from the perspective of the transmitting UE in the relevant TB, the use of HARQ feedback to release (multiple) unused resources is supported. However, no additional signaling is defined for the purpose of releasing unused resources of the transmitting UE.

[0136] Section 14.1.1.6 of TS36.213 defines PHY layer sensing and reporting of resources in LTE V2X according to the following steps:

[0137] 1) Candidate single-subframe resources R used for PSSCH transmission x,y Defined as a subframe L with sub-channels x+j subCH A set of consecutive sub-channels, where j = 0,...,L subCH -1. The UE should assume that the corresponding PSSCH resource pool (as described in 14.1.5) within the time interval [n+T1, n+T2] includes L subCH Any set of consecutive subchannels corresponds to a candidate single-frame resource, where the selection of T1 and T2 depends on T1≤4 and T2≤4. 2min (prio TX )≤T2≤100(if T) 2min (prio TX (By high-level officials targeting prio) TXProvided, otherwise implemented for UEs under the condition 20≤T2≤100). UE selection for T2 should meet the latency requirement. The total number of candidate single-subframe resources is determined by M. total express.

[0138] 2) The UE should listen to subframes. In addition to those subframes in which its transmission occurs, where subframe n belongs to the set but Otherwise subframe It belongs to the set after subframe n. The first subframe. The UE should perform the following actions based on the PSCCH decoded and the measured S-RSSI in these subframes.

[0139] 3) Parameter Th a,b It is set to the value indicated by the i-th SL-ThresPSSCH-RSRP field in the SL-ThresPSSCH-RSRP-List, where i = a*8+b+1.

[0140] 4) Set S A It is initialized as the union of all candidate single-frame resources. Set S B It is initialized to an empty set.

[0141] 5) If all of the following conditions are met, then the UE should be removed from set S. A Exclude any candidate single-subframe resources R x,y :

[0142] - In step 2, the UE did not listen to subframes.

[0143] - There exists a condition satisfying y+j×P′ rsvp_TX =z+P step An integer j of type ×k×q, where j = 0, 1, ..., C resel -1, P′ rsvp_TX =P step ×P rsvp_TX / 100, k is any value allowed by the higher-level parameter restrictResourceReservationPeriod, and q = 1, 2, ..., Q. Here, if k < 1 and n' - z ≤ P step ×k, then Where subframe n belongs to set but Otherwise subframe It belongs to the set after subframe n. The first subframe; otherwise Q=1.

[0144] 6) If all of the following conditions are met, then the UE should be removed from set S.A Exclude any candidate single-subframe resources R x,y :

[0145] -UE in subframe The system receives SCI format 1, and according to sub-clause 14.2.1, the “Resource Reservation” and “Priority” fields in the received SCI format 1 respectively indicate the value P. rsvp_RX and prio RX .

[0146] -Based on the received SCI format 1 PSSCH-RSRP measurement, it is higher than

[0147] -in subframe The received SCI format or assumption in (multiple) subframes The same SCI format 1 received in the middle is determined according to 14.1.1.4C. The set of overlapping resource blocks and subframes, for q = 1, 2, ..., Q and j = 0, 1, ..., C resel -1. Here, if P rsvp_RX <1 and n′-m≤P step ×P rsvp_RX ,but Where subframe n belongs to set but Otherwise subframe It belongs to the set after subframe n. The first subframe; otherwise Q=1.

[0148] 7) If set S A The number of remaining candidate single-frame resources is less than 0.2M. total Then, the Th value increases by 3dB. a,b Repeat step 4.

[0149] 8) For set S A The remaining candidate single-subframe resources R x,y Measure E x,y The subframes defined as being monitored in step 2 are in subchannel x+k (for k = 0, ..., L). subCH The linear average of the S-RSSI measured in -1), if P rsvp_TX If ≥100, then it can be expressed as For non-negative integer j, otherwise, it can be expressed as For non-negative integer j.

[0150] 9) The UE will have the minimum metric E x,y Candidate single-frame resources R x,y From set SA Move to S B Repeat this step until set S is reached. B The number of candidate single-frame resources in the dataset becomes greater than or equal to 0.2·M. total .

[0151] 10) When the UE is configured by the upper layer to transmit using a resource pool on multiple carriers, under the assumption that transmission occurs on (multiple) other carriers using already selected resources due to limitations on the number of carriers the UE can transmit on simultaneously, limitations on the UE's supported carrier combinations, or interruptions in RF retuning time, if the UE does not support transmission in the candidate single-frame resource on the carrier, it should switch from the S... B Excluding candidate single-subframe resources R x,y

[10]

[0152] The UE should then report set S to the higher layers. B .

[0153] Figure 6 A schematic diagram 600 illustrates how resources can be reserved for future transmissions in V2X communications. For example, a sending UE (Tx UE) can use resource #1 602 to perform an SL transmission from TB to (multiple) receiving UEs (Rx UEs).

[0154] The Tx UE and (multiple) Rx UEs may include, for example, communication modules integrated or installed in a vehicle subscribed to communication services of one or more telecommunications / Public Land Mobile Network (PLMN) operators. The Tx UE and (multiple) Rx UEs may subscribe to the telecommunications / PLMN operator and communicate with the operator's base station. The base station may be a next-generation NodeB (gNB). Those skilled in the art will understand that base station 602 may also be an ng-eNB and may connect to the 5G core network via an ng interface.

[0155] TB's SL transmission can be sent via the Physical Side Link Shared Channel (PSSCH), and its corresponding control information SCI can be sent via the Physical Side Link Control Channel (PSCCH). Therefore, as Figure 6As shown, SCI#1 in resource #1 602 indicates the current transmission (SCI#1+PSSCH#1) in resource #1 602, and resource #2 604 is also reserved for possible future transmissions (SCI#2+PSSCH#2) to (multiple) receivers with the same target (i.e., (multiple) Rx UEs). In response to this transmission, response information can be received at the receiver of the Tx UE. The response information relates to reserved resource #1 and reserved resource #2. The response information can indicate whether the transmission of data in resource #1 was successfully received by the receiving communication device. Furthermore, the response information can also indicate whether reserved resource #4 is reserved for Rx UEs. More details are provided below.

[0156] In certain circumstances, a Tx UE (or UE#1) can cancel future transmissions of its SCI#2+PSSCH#2, and the reserved resource #2 604 will then be considered released or "reserved but unused". For example, when PSSCH#2 is a possible HARQ retransmission of PSSCH#1, resource #2 604 can be released if PSSCH#1 is successfully received.

[0157] To date, 3GPP has only discussed the possibility of Tx UEs using “reserved but unused” resources. However, it remains unclear how “reserved but unused” resources can be utilized based on response information (i.e., the behavior of currently transmitting (multiple) Rx UEs, Tx UEs, and other UEs).

[0158] Therefore, this invention proposes an improved communication process that enables "reserved but unused" resources or Figure 6 Resource #2 604 shown can be utilized by (multiple) Rx UEs, Tx UEs and other UEs.

[0159] In the following paragraphs, certain exemplary embodiments are explained with reference to V2X communication mechanisms that advantageously allow “reserved but unused” or released resources to be utilized by the currently transmitting Rx UE(s), Tx UE(s), and other UEs.

[0160] For sidelink resources reserved by the UE for future transmissions (i.e., after the current transmission has occurred), the response information / signaling is known to the Tx UE when the reserved resources are released by the UE. Then, during resource selection by (multiple) UEs that know the response information, the reserved but unused resources can be included for possible transmissions from (multiple) UEs. This is because the reservation is known to all UEs receiving / decoding control information or the Rx UE's response information in the current transmission.

[0161] Reference Figure 6The Tx UE can perform a sidelink transmission of TB#1 (or data) in resource #1 602. SCI#1 in resource #1 602 indicates the current transmission (SCI#1 + PSSCH#1) in resource #1 602, and resource #2 604 can be reserved for future transmissions to the same target receiver as PSSCH#1, for example, future HARQ retransmissions. In response to the current data transmission in resource #1 602, a response message is received at the Tx UE indicating whether the current transmission of data to the target receiver was successfully received. The transmission of TB#1 in resource #1 602 can be unicast to another UE, multicast to a group of UEs, or broadcast. For all UEs receiving SCI#1 (not just the target receiver of PSSCH#1), where the Reference Signal Received Power (RSRP) of SCI#1 is higher than Th... a,b The Tx UE reserves future transmissions in resource #2. When the transmission of TB#1 in resource #1 602 is successfully received by the receiver UE (e.g., by receiving a response message from the receiver UE via the physical side link feedback channel (PSFCH), the Tx UE knows that resource #2 604 can be released. The response message can be any explicit or implicit signal used to notify that the reserved resource can be released, such as an acknowledgment feedback from the receiver UE to the Tx UE (e.g., HARQ-ACK or non-NACK). That is, the Tx UE and other UEs can obtain information about resources #1 602 and resource #2 604 by listening to the PSFCH (or response message) from the receiver UE. The Tx UE can also determine and send release information to other UEs to notify that resource #2 604 has been released, so that these UEs can include resource #2 604 in their resource selection for their own transmissions. In various embodiments, for example, in the case of mode 1 transmission, the release information can be generated from the associated base station or gNB to the Tx UE and(multiple) Rx UEs.

[0162] Figure 7 A schematic diagram 700 illustrates how a UE can utilize released resources according to various embodiments after learning about release information related to reserved resources. Reserved resources are resources that can be reserved for transmission. For example, such as... Figure 6 The described Tx UE can reuse the released resource #2 604 for subsequent transmissions of another TB (e.g., TB#2). In this embodiment, the PHY layer 702 of the Tx UE pairs the data from the initial set S. A The candidate resource sensing process is performed, and then the candidate resource set S is reported to the MAC layer 704 of the Tx UE. B Initial set S A Includes all M for subsequent transfers of TB#2 totalThere are candidate resources. During the sensing process, PHY layer 702 can perform a resource exclusion step, such that if the reserved resource #2 604 is in S... A If the reserved resource #2 604 is not from the initial set S, then the reserved resource will not be removed. A Excluded from the list. Conversely, if the reserved resource #2 604 is not in S... A Within, the reserved resource #2 604 will be transferred from the initial set S. A Excluded from the list. Following the resource exclusion step, the set S reported to the MAC layer as 704. B Contains from the remaining set S A ≥20%*M with the lowest RSRP total One candidate resource.

[0163] Subsequently, MAC layer 704 performs release judgment and resource selection. Release judgment is performed on reserved candidate resources, where MAC layer 704 determines whether a reserved candidate resource should be released based on its release information. Release information can be determined or generated by the TX UE (i.e., for candidate resources reserved for future transmissions from the Tx UE, such as resource #2604), or received from the Rx UE or its associated base station. For example, if S... B This includes resource #2 604, and resource #2 604 is determined to have been released by the MAC layer.

[0164] - During resource selection for subsequent transfers of TB#2, the MAC layer 704 can prioritize consecutive candidate resources containing resource #2 604 (if there is sufficient size and delay).

[0165] Resource #2 604 can be used partially, alone, or in combination with other continuum resources.

[0166] Otherwise, a MAC layer 704 error can be executed from S. B Resources are randomly selected for the transfer of TB#2.

[0167] Figure 8 A schematic diagram 800 illustrates how released resources can be utilized according to various embodiments. For example, as shown... Figure 6 The described Tx UE can reuse the released resources #2 604 for subsequent transmissions of another TB (e.g., TB#2). In this embodiment, the PHY layer 802 of the Tx UE pairs the resources from the initial set S. A The candidate resources are sensed and released, and then the candidate resource set S is reported to the MAC layer 804 of the TxUE. B Initial set S A Includes all M for subsequent transfers of TB#2 totalThere are candidate resources. During the sensing process, PHY layer 802 can perform a resource exclusion step, such that if reserved resource #2 604 is in S... A Furthermore, if reserved resource #2 604 is determined to be released by PHY layer 802, then reserved resource #2 604 will not be removed from the initial set S. A Excluded from the list. Conversely, even if resource #2604 is reserved in S... A Inside, the reserved resource #2 604 will also be removed from the initial set S. A The resource is excluded, but reserved resource #2604 is determined not to be released by PHY layer 802. A release determination is made for reserved candidate resources, where PHY layer 802 determines whether a reserved candidate resource is released based on the release information of the reserved candidate resources. The release information can be determined by the TXUE (i.e., for candidate resources reserved for future transmissions from the Tx UE, such as resource #2604), or received from the Rx UE or associated base station. After the resource exclusion step, a set S is reported to MAC layer 804. B Contains from the remaining set S A ≥20%*M with the lowest RSRP total One candidate resource.

[0168] After this, the MAC layer performs resource selection at 804. For example, if S B Includes resource #2 604:

[0169] - During resource selection for subsequent transfers of TB#2, the MAC layer 804 can prioritize consecutive candidate resources containing resource #2 604 (if there is sufficient size and waiting time).

[0170] Resource #2 604 can be used partially, alone, or in combination with other continuum resources.

[0171] Otherwise, MAC layer 804 can execute from S B Resources are randomly selected for the transfer of TB#2.

[0172] In other words, after the UE knows the response information related to the reserved resources, it can utilize the reserved resources according to various implementation methods. For example, such as Figure 6 The described Tx UE can reuse the released resource #2604 for subsequent transmissions of another TB (e.g., TB#2). In the example, the candidate resource set S B The resource can be provided to the MAC layer of the Tx UE via pre-configuration, RRC, or MAC. The MAC layer then performs resource selection. For example, if the SB contains resource #2 604:

[0173] - During resource selection for subsequent transfers of TB#2, the MAC layer can prioritize consecutive candidate resources containing resource #2 604 (if there is sufficient size and waiting time).

[0174] Resource #2 604 can be used partially, alone, or in combination with other continuum resources.

[0175] Otherwise, the MAC layer can execute from S B Resources are randomly selected for the transfer of TB#2.

[0176] Figure 9 The illustration shows how PHY layers such as PHY layers 702 and 802 are respectively in various embodiments. Figure 7 and Figure 8 The flowchart 900 illustrates the method for performing sensing. In step 902, the PHY layer senses all M... total A set S of candidate resources A In step 904, the PHY layer performs an iterative process of resource exclusion, such that candidate resources are removed from set S if certain conditions are met. A Excluded from the list. For Figure 7 and Figure 8 The methods shown differ in their exclusion criteria because the PHY layer is... Figure 8 The release check is performed in the method shown in the figure, while Figure 7 The method shown does not do this. In step 906, it is determined that S occurs after resource exclusion step 904. A Is the number of remaining candidate resources < 0.2M? total If it is determined that S occurs after resource exclusion step 904. A The number of remaining candidate resources is <0.2M total Then the process proceeds to step 914, where Th a,b Increase by 3dB, then return to step 904 for a repetitive process of resource exclusion until set S is determined in step 906. A Includes ≥20%*M total One candidate resource.

[0177] Subsequently, the process proceeds to sorting step 908, where candidate resources with the lowest RSRP are selected from S. A Move to S B In various embodiments, for Figure 8 Step 908 of the method shown in the figure, when resource #2 604 is from S A Excluded from the middle, and satisfying M total When the minimum RSPR is 20%, resource #2 604 can be given more weight to be included in set S. BIn various embodiments, for Figure 7 and Figure 8 Step 908 of the method shown in the figure, when resource #2 604 is not from S A Excluded, but not satisfying M. total When the minimum RSPR is 20%, resource #2 604 can be given more weight to be included in set S. B middle.

[0178] In step 910, determine set S B Is the number of candidate resources < 0.2M? total If set S is determined B The number of candidate resources is <0.2M total Then the sorting step 908 is repeated until set S is reached. B The number of candidate resources is ≥0.2M total In step 912, the set S is reported to a higher layer (e.g., MAC layer 704 or MAC layer 804). B .

[0179] In one embodiment, the transmitter of the Tx UE sends data to the receiving communication device in a first reserved resource out of at least two reserved resources, each of which is reserved for transmission to the receiving communication device. In response, the receiver receives response information indicating whether the transmission of data in the first reserved resource was successfully received by the receiving communication device. The communication device's circuitry then determines the use of a second reserved resource out of the at least two reserved resources based on the response information.

[0180] Figure 10 The illustration shows how, according to various embodiments, reserved but unused resources (or...) are identified in operation A. Figure 6The flowchart 6000 shows the use of resource #2 (604). In step 6002, the Tx UE (or transmitting communication device or UE #1) determines, based on the response information received at the Tx UE, whether the transmission of data in the first reserved resource was successfully received by the receiving communication device (or Rx UE or UE #2). If it is determined that the transmission of data in the first reserved resource was not successfully received by the receiving communication device, the process proceeds to step 6006, where the Tx UE performs data retransmission in the second reserved resource (or resource #2). If it is determined that the transmission of data in the first reserved resource was successfully received by the receiving communication device, the process proceeds to step 6004, and the second reserved resource (or reserved but unused resource) can be released to all communication devices on the network. In an embodiment, the second reserved resource (or reserved but unused resource) can be released to communication devices on the network with the same priority. Alternatively, the second reserved resource (or reserved but unused resource) can be released to communication devices on the network with the same or higher priority. In other words, when the response information indicates that the data in the first reserved resource has been successfully received by the receiving communication device, the second reserved resource can be released to at least one of the receiving communication device, the communication device, and another communication device. For example, during a sensing or (re)evaluation process, resource #2 will not be excluded as a resource reserved for communication devices on the network. In this way, other communication devices can be notified that resource #2 has been released.

[0181] For example, when PHY layer 702 determines whether a candidate resource is reserved, it will be uncertain whether a second reserved resource is reserved, where the second reserved resource is not from set S. A Excluded from the list.

[0182] However, it is not mandatory for other UEs to use the second reserved resources, therefore it is not necessary for other UEs to listen to the response information.

[0183] Figure 11A flowchart 1100 illustrates how the use of reserved but unused resources can be determined in operation B according to various embodiments. In step 1102, the Tx UE (or transmitting communication device or UE#1) determines, based on response information received at the Tx UE, whether the transmission of data in the first reserved resource (or resource #1) was successfully received by the receiving communication device (or Rx UE). If it is determined that the transmission of data in the first reserved resource was not successfully received by the receiving communication device, the process proceeds to step 1106, where the Tx UE performs data retransmission in the second reserved resource (or resource #2). If it is determined that the transmission of data in the first reserved resource was successfully received by the receiving communication device, the process proceeds to step 1104, where it is determined whether there is available data for transmission on the Tx UE. If it is determined that there is available data for transmission on the Tx UE, the process proceeds to step 1108, where the Tx UE performs data transmission on resource #2. If it is determined that there is no available data for transmission on the Tx UE, the process proceeds to step 1110, where resource #2 is not used. In operation B, when it is determined that the transmission of data on resource #1 has been successfully received, the Tx UE always retains the reservation right on resource #2.

[0184] Figure 12 A flowchart 1200 illustrates how the use of reserved but unused resources can be determined in operation C according to various embodiments. In step 1202, the Tx UE (or transmitting communication device or UE#1) determines, based on response information received at the Tx UE, whether the transmission of data in the first reserved resource (or resource #1) was successfully received by the receiving communication device (or Rx UE or UE#2). If it is determined that the transmission of data in the first reserved resource was not successfully received by the receiving communication device, the process proceeds to step 1206, where the Tx UE performs data retransmission in the second reserved resource. If it is determined that the transmission of data in the first reserved resource was successfully received by the receiving communication device (or Rx UE), the process proceeds to step 1204, where it is determined whether there is available data for transmission on the Tx UE. If it is determined that there is available data for transmission on the Tx UE, the process proceeds to step 1208, where the Tx UE performs data transmission on resource #2 604. If it is determined that no data is available for transmission on the Tx UE, the process proceeds to step 1210, where resource #2 can be used by other UEs, including the Rx UE. Furthermore, during the sensing or (re)evaluation process, resource #2 will not be excluded as a resource reserved for communication devices on the network. In this way, other communication devices are notified that resource #2 has been released.

[0185] Figure 13A flowchart 1300 illustrates how the use of reserved but unused resources can be determined in operation D according to various embodiments. In step 1302, the Tx UE (or transmitting communication device or UE#1) determines, based on the response information received at the Tx UE, whether the transmission of data in the first reserved resource was successfully received by the receiving communication device (or Rx UE or UE#2). If it is determined that the transmission of data in the first reserved resource was not successfully received by the receiving communication device, the process proceeds to step 1306, where the Tx UE performs data retransmission in the second reserved resource (or resource #2). If it is determined that the transmission of data in the first reserved resource was successfully received by the receiving communication device (or Rx UE), the process proceeds to step 1304, where it is determined whether there is available data for transmission on the Rx UE. If it is determined that there is available data for transmission on the Rx UE, the process proceeds to step 1308, where the Rx UE performs data transmission in the second reserved resource (or resource #2). This can be indicated in the response message to notify the Tx UE that resource #2 is reserved for receiving communication devices.

[0186] If it is determined that there is no available data for transmission on the Rx UE, the process proceeds to step 1310, where resource #2 is not used. This can be indicated in the response information to notify the Tx UE that resource #2 is not used when it is determined that there is no available data for transmission on the Rx UE.

[0187] Figure 14 A flowchart 1400 illustrates how the use of reserved but unused resources can be determined based on priority according to various embodiments. A UE on the network can be (pre-)configured to take which action for reserved but unused resources in different scenarios. For example, different operators / vendors can (pre-)configure different actions on different cells or different geographical areas. For different transmission priorities (or priority groups) of resource #1, different actions can be (pre-)configured or specified in the standard. For example, in step 1402, it is determined whether the priority is high. If the priority is determined to be high, the process proceeds to step 1404, for example, when the priority is 4-7, and execution is performed. Figure 10 Operation A is shown in the diagram. If the priority is determined to be low, the process proceeds to step 1406, for example, when the priority is 0-3, and execution will be performed. Figure 11 Operation B is shown in the diagram.

[0188] Figure 15A schematic diagram 1500 illustrates how the use of reserved but unused resources can be determined based on congestion levels according to various embodiments. Different operations can be (pre-)configured or specified in the standard for different congestion levels. For example, in step 1502, it is determined whether the congestion level is high. If the congestion level is determined to be high, the process proceeds to step 1504, and execution will be performed. Figure 11 Operation B is shown in the diagram. If it is determined that the congestion level is not high, the process proceeds to step 1506, for example, when the congestion level is high, and then execution will be performed. Figure 10 Operation A is shown in the figure.

[0189] Figure 16 A flowchart 1600 illustrating a communication method according to various embodiments is shown. In step 1602, the method includes sending data to a receiving communication device in a first reserved resource of at least two reserved resources, each of which is reserved for transmission to the receiving communication device. In step 1604, the method includes receiving at the communication device response information indicating whether the data in the first reserved resource has been successfully received by the receiving communication device. In step 1606, the method includes determining the use of a second reserved resource of the at least two reserved resources based on the response information.

[0190] Figure 17 It is shown that, according to, Figures 1 to 16 The schematic partial cross-sectional view shown is of a communication device 1700 that can be implemented to establish V2X communication according to various embodiments. The communication device 1700 can be implemented as a UE or a base station according to various embodiments.

[0191] The various functions and operations of the communication device 1700 are arranged in layers according to a layered model. In this model, according to 3GPP specifications, lower layers report to and receive instructions from higher layers. For simplicity, the details of the layered model are not discussed in this disclosure.

[0192] like Figure 17 As shown, the communication device 1700 may include circuitry 1714, at least one radio transmitter 1702, at least one radio receiver 1704, and at least one antenna 1712 (for simplicity and for illustrative purposes, in...). Figure 17(Only one antenna is depicted in the image). Circuit 1714 may include at least one controller 1706 for software and hardware-aided execution of tasks designed to be performed by the at least one controller 1706, including controlling communication with one or more other communication devices in a wireless network. Circuit 1714 may also include at least one transmit signal generator 1708 and at least one receive signal processor 1710. The at least one controller 1706 may control the at least one transmit signal generator 1708 to generate signals to be transmitted to one or more other communication devices via at least one radio transmitter 1702 (e.g., signals containing release information related to reserved resources), and control the at least one receive signal processor 1710 to process signals received from one or more other communication devices via at least one radio receiver 1704 under the control of the at least one controller 1706 (e.g., signals containing response information related to reserved resources in at least two reserved resources). Figure 17 As shown, at least one transmitting signal generator 1708 and at least one receiving signal processor 1710 may be independent modules of the communication device 1700, communicating with at least one controller 1706 to perform the aforementioned functions. Alternatively, at least one transmitting signal generator 1708 and at least one receiving signal processor 1710 may be included in at least one controller 1706. It will be understood by those skilled in the art that the arrangement of these functional modules is flexible and can vary according to actual needs and / or requirements. Data processing, storage, and other related control devices may be provided on appropriate circuit boards and / or chipsets. In various embodiments, at least one radio transmitter 1702, at least one radio receiver 1704, and at least one antenna 1712 may be controlled by at least one controller 1706.

[0193] The communication device 1700 provides the functionality required to utilize reserved resources. For example, the communication device 1700 may be a UE, and the radio receiver 1704 may receive response information indicating whether data in the first reserved resource has been successfully received by the receiving communication device, and based on the response information, determine the use of a second reserved resource out of at least two reserved resources.

[0194] For example, communication device 1700 may be a UE, and circuit 1714 may determine the use of a second reserved resource out of at least two reserved resources based on response information.

[0195] Receiver 1704 can receive response information from a base station, access point (AP), or another communication device different from the communication device. Response information can be received via PSFCH. Circuit 1714 can also select resources from multiple resource candidates, including reserved resources, when the communication device wants to perform subsequent transmissions, and transmitter 1702 can use the selected resources to send subsequent transmissions.

[0196] Circuit 1714 can also exclude or retain reserved resources from multiple resource candidates, whereby the PHY layer or MAC layer can make the decision based on the release information. Resource selection can be performed by the MAC layer. Transmitter 1702 can also send release information to the communication device group.

[0197] As described above, embodiments of this disclosure provide advanced communication systems, methods, and apparatus for utilizing release resources, which advantageously reduce the chance of over-the-air conflicts over release resources.

[0198] This disclosure can be implemented through software, hardware, or software cooperating with hardware. Each functional block used in the description of each of the above embodiments can be implemented partially or entirely by an LSI such as an integrated circuit, and each process described in each embodiment can be controlled partially or entirely by the same LSI or a combination of LSIs. An LSI can be configured as a chip on its own, or it can be configured as a chip to include some or all of the functional blocks. An LSI can include data inputs and outputs coupled thereto. Depending on the level of integration, the LSI herein can be referred to as an IC, a system LSI, a super LSI, or an ultra-LSI. However, the technology for implementing integrated circuits is not limited to LSIs and can be implemented using dedicated circuits, general-purpose processors, or special-purpose processors. Additionally, an FPGA (Field-Programmable Gate Array) programmable after the LSI is manufactured, or a reconfigurable processor in which the connections and settings of circuit cells arranged within the LSI can be reconfigured, can be used. This disclosure can be implemented as digital or analog processing. If future integrated circuit technologies replace LSIs due to advancements in semiconductor technology or other derivative technologies, future integrated circuit technologies can be used to integrate the functional blocks. Biotechnology can also be applied.

[0199] This disclosure can be implemented by any kind of device, apparatus or system having communication capabilities, which is referred to as a communication device.

[0200] The communication device may include a transceiver and processing / control circuitry. The transceiver may include and / or act as a receiver and transmitter. As a transmitter and receiver, the transceiver may include an RF (radio frequency) module, which includes an amplifier, an RF modulator / demodulator, etc., and one or more antennas.

[0201] Some non-limiting examples of such communication devices include telephones (e.g., cellular (mobile) phones, smartphones), tablets, personal computers (PCs) (e.g., laptops, desktops, netbooks), cameras (e.g., digital still / video cameras), digital players (digital audio / video players), wearable devices (e.g., wearable cameras, smartwatches, tracking devices), game consoles, digital book readers, remote healthcare / telemedicine (remote healthcare and medical) devices, and vehicles (e.g., cars, airplanes, ships) that provide communication capabilities, and various combinations thereof.

[0202] The communication device is not limited to portable or mobile, and may also include any type of non-portable or stationary device, equipment or system, such as smart home devices (e.g., appliances, lighting, smart meters, control panels), vending machines and any other “thing” in an “Internet of Things (IoT)” network.

[0203] Communication can include exchanging data through, for example, cellular systems, wireless LAN systems, satellite systems, and various combinations thereof.

[0204] The communication device may include a device such as a controller or sensor coupled to a communication device that performs the communication functions described in this disclosure. For example, the communication device may include a controller or sensor that generates control signals or data signals used by the communication device performing the communication functions of the communication device.

[0205] The communication apparatus may also include infrastructure such as base stations and access points, as well as any other apparatus, devices, or systems that communicate with or control the apparatuses such as those in the non-limiting examples above.

[0206] It will be understood that although some properties of various embodiments have been described with reference to the device, the corresponding properties also apply to the methods of various embodiments, and vice versa.

[0207] Those skilled in the art will understand that various changes and / or modifications can be made to the present disclosure shown in the specific embodiments without departing from the spirit or scope of the present disclosure as broadly described. Therefore, the embodiments are to be considered illustrative rather than restrictive in all respects.

Claims

1. A communication device, comprising: The transmitter sends data to the receiving communication device in a first reserved resource of at least two reserved resources, each of which is reserved for transmission to the receiving communication device; The receiver receives information on the physical side crosslink feedback channel PSFCH, which transmits explicit signals indicating whether the transmission of data in the first reserved resource has been successfully received by the receiving communication device and indicating the status of the second reserved resource among the at least two reserved resources. as well as The circuit, based on an explicit signal transmitted by the physical side link feedback channel indicating that the transmission of data in the first reserved resource was successfully received by the receiving communication device, and determining that the communication device has no available data to transmit, determines that the second reserved resource of the at least two reserved resources is held by the communication device and is not used by the communication device.

2. The communication device according to claim 1, wherein, Before determining that the second reserved resource is not used, the circuit determines whether the receiving communication device has available data to transmit.

3. The communication device according to claim 1, wherein, Before determining that the second reserved resource is not used, the circuit determines whether the communication device has available data for transmission.

4. The communication device according to claim 3, wherein, The circuit determines that the communication device has no available data to transmit.

5. The communication device according to claim 2, wherein, The circuit determines that the receiving communication device has no available data to transmit.

6. A communication method, comprising: Data is sent to the receiving communication device in a first reserved resource of at least two reserved resources, each of which is reserved for transmission to the receiving communication device; Information received at the communication device on the physical side cross-link feedback channel PSFCH is transmitted, which transmits explicit signals indicating whether the data in the first reserved resource has been successfully received by the receiving communication device and indicating the status of the second reserved resource among the at least two reserved resources. as well as Based on an explicit signal transmitted by the physical side link feedback channel indicating that the transmission of data in the first reserved resource was successfully received by the receiving communication device, and determining that the communication device has no available data to transmit, it is determined that the second reserved resource of the at least two reserved resources is held by the communication device and is not used by the communication device.

7. The communication method according to claim 6 further includes: Before determining that the second reserved resource is not used, it is determined whether the receiving communication device has available data to transmit.

8. The communication method according to claim 6 further includes: Before determining that the second reserved resource is not used, determine whether the communication device has available data for transmission.

9. The communication method according to claim 8, comprising: It was determined that the communication device had no available data to transmit.

10. The communication method according to claim 7, comprising: It was determined that the receiving communication device had no available data to transmit.

Images