Mitigating physical sidelink feedback channel interruptions during LTE-v2x and NR-v2x

Abstract

Embodiments of the present disclosure relate to mechanisms for identifying and overcoming overlapping in LTE-V2X and NR-V2X sidelink resources for sidelink communications. In an example embodiment, a user equipment performs sensing of reserved resources in both a first sidelink radio access technology resource pool and a second sidelink radio access technology resource pool. Forming, based on the sensing, at least one candidate resource set identifying all resources to be freely used by the first radio access technology resource pool according to an indication that the resources are not being used for transmission by at least one other user equipment of the first sidelink radio access technology resource pool, and identifying, for each resource in the at least one set of candidate resources, a corresponding resource of a physical sidelink feedback channel to be used for the first sidelink radio access technology resource pool. Based on the sensing, all of the physical sidelink feedback channel resources identified as being reserved for transmission by at least one other user equipment of the first sidelink radio access technology resource pool are excluded from the at least one candidate resource set, and selecting, from the at least one candidate resource set, a resource to be used for transmission of the physical sidelink control channel and the physical sidelink shared channel.

Description

Technical Field

[0001] Teachings of exemplary embodiments in accordance with the present invention generally relate to identifying and overcoming overlap in LTE-V2X and NR-V2X sidelink resources for sidelink communications. Background Art

[0002] This section is intended to provide a background or context to the invention recited in the claims. The description herein may include concepts that may be pursued, but not necessarily concepts that have been previously conceived or pursued. Therefore, unless otherwise indicated herein, what is described in this section is not prior art to the description and claims in this application and is not admitted to be prior art by inclusion in this section.

[0003] Certain abbreviations that may appear in the specification and / or drawings are defined as follows:

[0004] SCI Side Link Control Information

[0005] TX Transmitter

[0006] RX Receiver

[0007] PRB Physical Resource Block

[0008] HARQ Hybrid Automatic Repeat Request

[0009] PSFCH Physical Sidelink Feedback Channel

[0010] PSSCH Physical Sidelink Shared Channel

[0011] PSCCH Physical Sidelink Control Channel

[0012] V2X Vehicle to Everything

[0013] RSRP Reference Signal Received Power

[0014] ITS Intelligent Transportation System

[0015] CAM Collaborative Awareness Message

[0016] BSM Basic Safety Message

[0017] SPS Semi-Persistent Scheduling

[0018] SC-FDMA Single Carrier Frequency Division Multiple Access

[0019] OFDM Orthogonal Frequency Division Multiplexing

[0020] DMRS Demodulation Reference Signal

[0021] TB Transfer Block

[0022] MCS Modulation and Coding Scheme

[0023] SA Scheduling Assignment

[0024] QPSK Quadrature Phase Shift Keying

[0025] QAM Quadrature Amplitude Modulation

[0026] AGC Automatic Gain Control

[0027] It is noted that there is a demand for high-capacity and high-speed data processing and various services using and connecting wireless terminals, such as in vehicles (air or ground) or at sites, etc. Therefore, there is a demand for technologies for high-speed and high-capacity telecommunication systems, including sidelink communication technologies, which have evolved from simple voice-centric services and are capable of handling various scenarios and high-capacity data, such as wireless data, machine type communication data, and sidelink communication data, to name a few.

[0028] Example embodiments of the present invention are directed to methods and apparatus for improving sidelink related services and resource allocation in sidelink wireless communications. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other aspects, features and benefits of various embodiments of the present disclosure will become more fully apparent from the following detailed description with reference to the accompanying drawings, in which like reference numerals are used to refer to similar or equivalent elements. In order to facilitate a better understanding of the embodiments of the present disclosure, the accompanying drawings are illustrated, and the drawings are not necessarily drawn to scale, in which:

[0030] Figure 1 shows the deployment band configuration of C-V2X at 5.9 GHz in Europe;

[0031] Figure 2 shows the deployment band configuration of C-V2X at 5.9 GHz in Europe;

[0032] Figure 3A An example of LTE-V2X and NR-V2X co-channel coexistence in the same carrier is shown;

[0033] Figure 3B A table showing an example of fully overlapping NR-V2X resource pool into LTE-V2X resource pool;

[0034] Figure 4 LTE SL resource allocation modes are shown: (a) Mode 3; (b) Mode 4;

[0035] Figure 5 LTE-V2X (subframe) slot format for PSSCH and PSCCH is shown;

[0036] Figure 6 LTE-V2X channelization is shown with adjacent and non-adjacent PSCCH+PSSCH;

[0037] Figure 7 NR SL resource allocation modes are shown: (a) Mode 1; (b) Mode 2;

[0038] Fig. 8A Table 1 shows the second stage SCI format;

[0039] Figure 8B Table 2 shows the second stage SCI format;

[0040] Fig. 9A SL slot formats are shown: (a) a slot with PSCCH / PSSCH; (b) a slot with PSCCH / PSSCH and PSFCH;

[0041] Fig. 9B shows the PSSCH DMRS configuration based on the number of symbols used and the duration of the PSCCH;

[0042] Fig.10 SL slots with PSCCH / PSSCH and PSFCH are shown;

[0043] Fig.11 PSSCH to PSFCH mapping is shown;

[0044] Fig.12 An example of overlapping of the LTE-V2X resource pool and the NR-V2X resource pool is shown;

[0045] Fig.13 Dual sensing is shown, where it is assumed that the vehicle has both LTE and NR modules and is capable of performing simultaneous sensing, and where overlapping LTE-V2X and NR-V2X resource pools are sensed simultaneously;

[0046] Fig.14 An example of LTE sidelink transmissions interfering with NR PSFCH resources due to overlap is shown;

[0047] Fig.15 shows a process from a TX perspective according to an example embodiment of the present invention;

[0048] Fig.16 shows a process from the RX perspective according to an example embodiment of the present invention; and

[0049] Fig.17 shows a high-level block diagram of various devices used in performing various aspects of the present invention;

[0050] Fig.18A , Fig.18B , Fig.18C and Fig.18D Each shows a method according to an exemplary embodiment of the present invention, which method can be performed by an apparatus. DETAILED DESCRIPTION

[0051] In an example embodiment of the present invention, a method that may be performed by an apparatus is presented to identify and overcome overlap in LTE-V2X and NR-V2X sidelink resources for sidelink communications.

[0052] Spectrum Regulation

[0053] European regulators have designated the 5855-5875MHz and 5875-5925MHz bands (known as the 5.9GHz band) for use by road-based Intelligent Transport Systems (ITS). The industry is planning to deploy C-V2X (LTE-V2X and NR-V2X) technology in the 5.9GHz band for direct communication (via the PC5 interface), such as Figure 1 As depicted in .

[0054] It should be considered Figure 1 Related to the following:

[0055] a) should not cause harmful interference to priority applications;

[0056] b) Road ITS and Rail ITS should remain confined to their respective prioritized frequency ranges until appropriate spectrum sharing technical solutions are defined by ETSI (but see (c));

[0057] c) Vehicle-to-vehicle (V2V) communications for road ITS may be permitted at 5915-5925 MHz only if a spectrum sharing technical solution for protecting rail ITS has been developed at ETSI. In the absence of such a shared technical solution for protecting rail ITS, national authorities may permit infrastructure-to-vehicle (I2V) communications for road ITS at 5915-5925 MHz, subject to coordination with rail ITS; and / or

[0058] d) Use of spectrum in the frequency range 5855-5875 MHz is on a non-interference / non-protection basis and includes use by non-safety road ITS and non-specific short range devices.

[0059] In the deployment band configuration proposed by 5GAA for C-V2X at 5.9 GHz in Europe, LTE-V2X is constrained to the 5905-5915 MHz and 5915-5925 MHz bands. The remaining spectrum is expected to be available for NR-V2X.

[0060] In addition, 5GAA points out challenges associated with the impact of coexistence between technologies on security. Namely, "A coexistence work item is underway at ETSI to investigate the feasibility of co-channel coexistence between LTE-V2X and ITS-G5 in the 5.9 GHz band. Such coexistence will inevitably have a negative impact on the ability of both technologies to deliver secure and reliable communications; and may also affect the specifications of the technologies and the complexity of the products."

[0061] 3GPP Standardization Background

[0062] In the standards at the time of this application, the goal of achieving coexistence of LTE-V2X and NR-V2X has been approved for the following reasons:

[0063] Another aspect to consider is the V2X deployment scenario where LTE V2X and NR V2X devices are to coexist in the same frequency channel. In order for two different types of devices to coexist when using a common carrier frequency, it is important that there is a mechanism to efficiently utilize the resources allocated by both technologies without negatively impacting the operation of each technology.

[0064] In the standards at the time of this application, the RAN studied and introduced an in-device coexistence framework for NR SL - the results of the relevant RAN4 work were studied at the time of this invention to obtain standards approval. From this study, the following mechanisms were introduced:

[0065] ●TDM-based:

[0066] ○ Synchronization / subframe boundary alignment is required between LTE and NR sidelink

[0067] ○ Long-term time scale TDM operation:

[0068] ■LTE SL and NR SL resource pools are configured to not overlap in the time domain

[0069] => No regulatory impact

[0070] ○ Short-term time scale TDM operation:

[0071] ■ For TX / TX and TX / RX overlap, if the packet priorities for both LTE and NR sidelink transmission / reception are known to both RATs before the transmission time, but subject to processing time constraints, the packet with the higher relative priority is sent / received;

[0072] ■ Equal priority TX / TX or TX / RX depends on UE implementation

[0073] ■RX / RX situation depends on UE implementation

[0074] ■Priority details:

[0075] ●The priority of PSFCH is the same as the corresponding PSSCH

[0076] ● Priority of LTE PSBCH and NR S-SSB is (pre)configured ● If multiple NR SL transmissions / receptions overlap with a single LTE SL TX / RX, the highest priority NR SL TX / RX determines the priority of the NR SL

[0077] ●Based on FDM:

[0078] ○Static frequency allocation between NR and LTE SL

[0079] ○ If the frequency separation between LTE and NR is large enough, no synchronization is required between NR and LTE

[0080] ○ Static power allocation, which means that the full UE TX power is used only when transmitting LTE and NR SL simultaneously

[0081] Please note that the goal of the standard at the time of this application is to go beyond intra-device coexistence and focus on co-channel coexistence, i.e. coexistence between different devices (UEs) in the same radio resources / carrier frequencies. Figure 3A In , some examples of coexistence of LTE-V2X and NR-V2X in the same radio resources are presented.

[0082] From the perspective of resource utilization, it is well known that dynamic spectrum sharing (e.g. Figure 3A The examples depicted in (d) and (e) are more flexible and achieve higher efficiency. However, the disadvantage of these solutions is that they are more complex due to auxiliary mechanisms that enable coexistence with other systems. In contrast, Figure 3A The static spectrum sharing options depicted in (a), (b) and (c) are simpler. It is also foreseeable that Figure 3A (e) is likely to be the only option available in practice, as LTE-V2X devices may be configured to occupy the entire bandwidth, and NR-V2X devices will need to be able to adapt to this in order to be able to access the ITS band. However, given the potential difficulty of modifying the pre-configuration, it may be better to allow NR V2X UEs to use all available resources, such that there are no resources dedicated to LTE (or NR), but the same resources are available for both, i.e. full overlap.

[0083] Since no enhancements are expected from the LTE-V2X perspective to enable such sharing, it may not even be expected that any changes or reconfigurations of the resource pool configurations associated with the LTE-V2X devices will be made. Instead, it is expected that all efforts must be made from the perspective of the NR-V2X devices, thus making the dynamic spectrum sharing scheme the only feasible technical solution for the coexistence of LTE-V2X and NR-V2X.

[0084] Additionally, as more vehicles enter the market, it will become more important to support advanced V2X use cases that require NR-V2X to operate. At the same time, since CAM (or BSM) can be transmitted using either LTE-V2X or NR-V2X, it is expected that over time more and more vehicles will utilize NR-V2X and fewer vehicles will utilize LTE-V2X. Therefore, by enabling LTE-V2X and NR-V2X to coexist in the same resources, this will achieve a soft reallocation of LTE-V2X resources. In contrast, if static TDM or FDM is considered to be deployed for LTE-V2X and NR-V2X, this will mean that resources associated with LTE-V2X will likely remain allocated for decades, without NR-V2X being able to use these resources. Of course, in order for this to make sense, NR-V2X will also have to be allowed to be used for safety-related ITS.

[0085] In deployment scenarios where NR-V2X devices can use the same resources (i.e. Figure 3A (d)), the NR-V2X parameter set needs to be contained as perfectly as possible within the LTE-V2X parameter set. NR-V2X is expected to be deployed in FR1 with a subcarrier spacing of 30kHz, while the subcarrier spacing of LTE-V2X is 15kHz. Therefore, in the time domain, two NR-V2X time slots can be contained in one LTE-V2X subframe, while in the frequency domain, the NR-V2X PRB will have twice the bandwidth of the LTE-V2X PRB. Both LTE-V2X and NR-V2X SL resources are organized into resource pools, which are organized into time slots (NR-V2X) or subframes (LTE-V2X) in the time domain, while in the frequency domain, these resources are organized into subchannels consisting of multiple PRBs. The configurable number of PRBs for LTE-V2X and NR-V2X is as follows:

[0086] LTE-V2X: 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 25, 30, 48, 50, 72, 75, 96, 100; and

[0087] ●NR-V2X: 10, 12, 15, 20, 25, 50, 75, 100.

[0088] Therefore, assuming perfect overlap between the LTE-V2X resource pool and one (or more) NR-V2X resource pools, the following configuration pairings are possible, such as Figure 3B As depicted in Table 1 of . Note that this is just an example, but in practice, any number of LTE-V2X and NR-V2X resource pools can be implemented since there will be multiple LTE-V2X resource pools. The only important aspect is that the LTE-V2X and NR-V2X PRBs are aligned in both time and frequency.

[0089] The LTE-V2X standard at the time of this application has been designed to facilitate vehicles to communicate with other nearby vehicles via direct / SL communications. Communication between these vehicles can occur using Mode 3 or Mode 4 in LTE-V2X, such as Figure 4 As depicted in .

[0090] When in Mode 3, the sidelink radio resources are scheduled by the base station or evolved NodeB (eNB), and therefore are only available when the vehicle is within cell coverage.

[0091] When in Mode 4, vehicles autonomously select their sidelink radio resources regardless of whether they are under cell coverage or not. When the vehicle is under cell coverage, the network decides how to configure the LTE-V2X channel and informs the vehicle through the LTE-V2X configurable parameters. The message includes the carrier frequency of the LTE-V2X channel, the LTE-V2X resource pool, the synchronization reference, the channelization scheme, the number of subchannels per subframe, and the number of RBs per subchannel. When the vehicles are not under cell coverage, they replace the LTE-V2X configurable parameters with a set of preconfigured parameters. However, the standard does not specify specific values ​​for each parameter. The LTE-V2X resource pool indicates which subframes of the channel are utilized for LTE-V2X. The remaining subframes can be utilized by other services including cell communications.

[0092] Autonomous resource selection in Mode 4 is performed using the sensing and resource exclusion process specified in Release 14, where a vehicle reserves selected subchannel(s) for multiple periodically recurring packet transmissions. This in turn can be sensed by other vehicles, influencing their own resource selection / exclusion decisions.

[0093] Physical Layer

[0094] LTE-V2X uses SC-FDMA (Single Carrier Frequency Division Multiple Access) and supports 10MHz and 20MHz channels. The channel is divided into 180kHz resource blocks (RBs), each corresponding to 12 15kHz subcarriers. In the time domain, the channel is organized into 1ms subframes.

[0095] Each subframe has 14 OFDM symbols with a normal cyclic prefix. Nine of these symbols are used to send data, while four of them (3rd, 6th, 9th and 12th) are used to send demodulation reference signals (DMRS) for channel estimation and to combat Doppler effects at high speeds. The last symbol is used as a guard symbol for timing adjustment and to allow vehicles to switch between transmission and reception across subframes. The format is Figure 5 Depicted in.

[0096] RBs are grouped into subchannels. A subchannel may include RBs only within the same subframe. The number of RBs per subchannel may vary and is (pre)configured. Subchannels are used to send data and control information. Data is organized in transport blocks (TBs) carried in the physical sidelink shared channel (PSSCH). A TB contains a complete packet (e.g., CAM or BSM). A TB may occupy one or several subchannels, depending on the size of the packet, the number of RBs per subchannel, and the modulation and coding scheme (MCS) utilized. TBs may be sent using QPSK, 16-QAM, or 64QAM modulation and Turbo coding.

[0097] Each TB has an associated Sidelink Control Information (SCI) message, which is carried in the Physical Sidelink Control Channel (PSCCH). It is also called a Scheduling Assignment (SA). The SCI occupies 2 RBs and includes information such as: an indication of the RBs occupied by the associated TB; the MCS used for the TB; the priority of the message being sent; an indication of whether it is the first transmission or a blind retransmission of the TB; and a resource reservation interval. A blind retransmission refers to a scheduled retransmission or repetition of a TB (i.e., not based on feedback from the receiver). The resource reservation interval specifies when the vehicle will utilize (multiple) reserved subchannels to send its next TB. The SCI includes critical information for the correct reception of the TB. If the associated SCI is not received correctly, the TB cannot be properly decoded. A TB and its associated SCI must always be sent in the same subframe.

[0098] like Figure 6 As depicted in , a TB (PSSCH) and its associated SCI (PSCCH) may be transmitted in adjacent or non-adjacent sub-channels, where:

[0099] ● Contiguous PSCCH+PSSCH: SCI and TB are sent in contiguous RBs. For each SCI+TB transmission, the SCI occupies the first two RBs of the first subchannel used for transmission. The TB is sent in RBs after the SCI and may occupy several subchannels (depending on its size). If it does so, it will also occupy the first two RBs of the following subchannels; and

[0100] ● Non-adjacent PSCCH+PSSCH: RBs are divided into pools. One pool is dedicated to sending only SCI, which occupies two RBs. The second pool is reserved to send only TBs and is divided into subchannels.

[0101] NR-V2X Overview

[0102] In the standard at the time of this application, the NR Sidelink (SL) is designed to facilitate user equipment (UE) to communicate with other nearby (multiple) UEs via direct / SL communication. Two resource allocation modes have been specified, and the SL transmitter (TX) UE is configured with one of them to perform its NR SL transmission. These modes are denoted as NR SL Mode 1 and NR SL Mode 2. In Mode 1, the sidelink transmission resources are assigned (scheduled) to the SL TX UE by the network (NW), while the SL TX UE in Mode 2 autonomously selects its SL transmission resources.

[0103] In Mode 1, where the gNB is responsible for SL resource allocation, configuration and operation are similar to those over the Uu interface. Figure 7 (depicted in).

[0104] In Mode 2, the SL UE autonomously performs resource selection with the help of a sensing process. More specifically, the SL TX UE in NR SL Mode 2 first performs a sensing process through the configured (multiple) SL transmission resource pools in order to obtain knowledge of the (multiple) reserved resources by other nearby (multiple) SL TX UEs. Based on the knowledge obtained from the sensing, the SL TX UE can select (multiple) resources from the available SL resources accordingly. In order for the SL UE to perform sensing and obtain the information necessary to receive SL transmission, it needs to decode the sidelink control information (SCI). In Release 16, the SCI associated with data transmission includes the first stage SCI and the second stage SCI, and their contents are standardized.

[0105] Sidelink Control Information (SCI)

[0106] The SCI follows a 2-stage SCI structure, the main motivation of which is to support the size difference between the SCIs for various NR-V2X SL service types (e.g. broadcast, multicast and unicast).

[0107] The first stage SCI, SCI format 1-A, is carried by PSCCH and contains:

[0108] ●Information used to enable sensing operations

[0109] ●Determine the PSSCH resource allocation and the information required to decode the second stage SCI

[0110] SCI format 1-A is used for scheduling of PSSCH and second-stage SCI on PSSCH. The following information is sent via SCI format 1-A:

[0111] - Priority – 3 bits;

[0112] - Frequency resource assignment – ​​When the value of the higher layer parameter sl-MaxNumPerReserve is configured as 2, bit; otherwise, when the value of the higher layer parameter sl-MaxNumPerReserve is configured as 3, Bit;

[0113] - Time resource assignment – ​​5 bits when the value of the higher layer parameter sl-MaxNumPerReserve is configured as 2; otherwise 9 bits when the value of the higher layer parameter sl-MaxNumPerReserve is configured as 3;

[0114] - Resource reservation period – If the higher layer parameter sl-MultiReserveResource is configured, bits, as defined in clause 8.1.4 of [6, TS 38.214], where N rsv_period is the number of entries in the higher layer parameter sl-ResourceReservePeriodList; otherwise 0;

[0115] -DMRS Mode– bits, as defined in the standard at the time of this application, where N pattern It is the number of DMRS patterns configured by the higher layer parameter sl-PSSCH-DMRS-TimePatternList; if sl-PSSCH-DMRS-TimePatternList is not configured, it is 0.

[0116] -Phase II SCI format – 2 bits;

[0117] - Beta_offset indicator – 2 bits, as provided by the higher layer parameter sl-BetaOffsets2ndSCI;

[0118] -DMRS port number – 1 bit;

[0119] - Modulation and coding scheme – 5 bits;

[0120] - Additional MCS table indicator – as defined in the standard at the time of this application: 1 bit if one MCS table is configured by the higher layer parameter sl-Additional-MCS-Table; 2 bits if two MCS tables are configured by the higher layer parameter sl-Additional-MCS-Table; 0 bit otherwise;

[0121] -PSFCH overhead indication – 1 bit if higher layer parameter sl-PSFCH-Period = 2 or 4, as defined in the standard at the time of this application; otherwise 0 bit;

[0122] - Reserved – the number of bits determined by the higher layer parameter sl-NumReservedBits, where the value is set to zero.

[0123] Fig. 8A Table 1 shows the Stage 2 SCI format.

[0124] The second stage SCI, SCI formats 2-A and 2-B, are carried by PSSCH (multiplexed with SL-SCH) and contain:

[0125] Source and target identification

[0126] ● Information used to identify and decode the associated SL-SCH TB

[0127] ●HARQ feedback control in unicast / multicast

[0128] ● Trigger for CSI feedback in unicast

[0129] The content of the second phase of SCI is Figure 8B Table 2 provides:

[0130] The configuration of resources in the sidelink resource pool defines the minimum information required for the RX UE to be able to decode the transmission, which includes the number of subchannels, the number of PRBs per subchannel, the number of symbols in the PSCCH, which time slots have PSFCH, and other configuration aspects not relevant to the example embodiments of the present invention.

[0131] However, the details of the actual sidelink transmission (ie, payload) are provided in the PSCCH (Phase 1 SCI) for each individual transmission, including: time and frequency resources, DMRS configuration for PSSCH, MCS, PSFCH, etc.

[0132] exist Fig. 9A An example of an SL slot structure is depicted in , which shows a slot with PSCCH / PSSCH and a slot with PSCCH / PSSCH where the last symbol is used for PSFCH.

[0133] The configuration of the PSCCH (e.g., DMRS, MCS, number of symbols used) is part of the resource pool configuration. In addition, the indication of which time slots have PSFCH symbols is also part of the resource pool configuration. However, the configuration of the PSSCH (e.g., number of symbols used, DMRS mode, and MCS) is provided by the first stage SCI, which is the payload sent within the PSCCH and follows Fig. 9B The configuration depicted in .

[0134] HARQ Process

[0135] The PSFCH was introduced during Rel-16 to enable HARQ feedback over the sidelink from the UE that is the intended recipient of the PSSCH transmission (i.e., the RX UE) to the UE that performs the transmission (i.e., the TX UE). Within the PSFCH, the Zadoff-Chu sequence in one PRB is repeated over two OFDM symbols, the first of which can be used for AGC, located near the end of the sidelink resources in the slot. Fig.10 Example slot formats for PSCCH, PSSCH and PSFCH are provided in . The Zadoff-Chu sequence as the basic sequence is (pre-)configured per sidelink resource pool.

[0136] The time resources of PSFCH are (pre-)configured to occur once every 1, 2 or 4 time slots, and the HARQ feedback resources (PSFCH) are derived from the resource location of PSCCH / PSSCH.

[0137] For PSSCH to HARQ timing, there is a configuration parameter K, which is in slots. The time instance of PSFCH is determined by K. For a PSSCH transmission whose last symbol is in slot n, HARQ feedback is in slot n+a, where a is the smallest integer greater than or equal to K, provided that slot n+a contains PSFCH resources. Fig.11 In the example illustrated in FIG, the period of the PSFCH resource is configured as 4, and K(sl-MinTimeGapPSFCH) is configured as 3. For a PSSCH transmitted in slot 1 or 2, the time occasion of the corresponding PSFCH is slot 4. The PSFCH resource for HARQ feedback of PSSCH transmissions with the same starting subchannel in different slots is FDM. Fig.11 In the example illustrated in , the PSFCH resources of the PSSCH in time slots 1 and 2 are FDM in time slot 4.

[0138] To explain this problem, consider the overlap of the NR-V2X resource pool onto the LTE-V2X resource pool, such as Fig.12 As depicted in .

[0139] When the NR-V2X resource pool overlaps with the LTE-V2X resource pool, then the NR device will have to perform sensing in the same way that it detects the activity of other NR and LTE devices when performing resource selection via Mode 2. This means that the NR device will have to monitor both overlapping resource pools and decode both the LTE SCI sent in the LTE-V2X resource pool and the NRSCI sent in the NR-V2X resource pool. From these SCIs, the NR device becomes aware of the future transmissions of other surrounding devices and from there determines which resources will be available (i.e. should not be excluded) for its own(multiple) NR-V2X sidelink transmissions. This process is done in Fig.13 Targeted Fig.12 Illustration of the NR coverage configuration depicted in .

[0140] In the NR sidelink, some PSCCH / PSSCH transmissions (unicast and multicast) can be configured to request HARQ feedback from the intended receiver. This means that the intended NR receiver will use the associated (multiple) PSFCH resources to provide HARQ feedback when decoding the SCI (both first-stage SCI and second-stage SCI) associated with the PSCCH / PSSCH transmission.

[0141] This raises the question that when the NR-V2X and LTE-V2X resource pools overlap, the resources where the PSFCH transmission occurs may also overlap with the resources used for LTE sidelink transmissions. Fig.14 There are configurations that avoid this overlap: if the NR SL SCS is 60kHz, and PSFCH resources are configured once every four NR slots, it can be arranged that the PSFCH transmission occurs during the protection period of the LTE SL. However, this is not the preferred configuration, as 30kHz is generally considered to be the most suitable SCS for NR SL in FR1.

[0142] In the NR sidelink, sensing occurs from the perspective of the NR TX and is only directed to selecting resources where the NR TX can perform its NR PSCCH / PSSCH transmissions without interfering with other NR PSCCH / PSSCH transmissions. Therefore, it does not take into account whether the associated PSFCH resources will be available for the NR RX to provide HARQ feedback (e.g., due to transmissions from LTE sidelink devices overlapping with the associated PSFCH resources).

[0143] Overlap between NR PSFCH transmissions and LTE SL transmissions may cause the following issues:

[0144] At the LTE SL RX UE:

[0145] ● Even if the overlap is only in time (i.e. the PRBs of LTE SL and NR PSFCH do not overlap), LTE SL reception may be severely degraded because the RX receive gain of the LTE SL RX UE is assumed to be already set during the first symbol of the LTE subframe. When the NR PSFCH transmission starts, the LTE SL RX UE will receive much higher power, resulting in saturation and clipping if the frequency separation is too low; and

[0146] • Furthermore, PSFCH transmissions cause additional interference at the LTE SL RX UE, especially when the overlap is in both time and frequency.

[0147] At NR SL TX UE:

[0148] • Interference from LTE SL transmissions may degrade PSFCH reception performance, especially when the overlap is in both time and frequency.

[0149] Finally, since the goal of LTE SL is basic road safety, the transmission and reception of LTE SL should be protected. However, this means that the NR SL RX UE will not be able to provide HARQ feedback. In an exemplary embodiment of the present invention, this problem is solved.

[0150] For some example embodiments of the present invention, it is assumed that the LTE-V2X and NR-V2X sidelink resource pools overlap in both time and frequency (e.g., as Fig.13 Consider then the case where the vehicle has both LTE-V2X and NR-V2X sidelink modules and these are connected to each other in a manner that allows information to be exchanged between the two modules, thereby enabling the vehicle to simultaneously sense the LTE-V2X and NR-V2X sidelink resource pools. In particular, sensing in the LTE-V2X sidelink resource pool allows the NR-V2X sidelink module to identify future LTE-V2X sidelink transmissions.

[0151] According to an example embodiment of the present invention, in the presence of an NR-V2X resource pool overlapping the LTE-V2X resource pool, the NR device will have to perform sensing in a manner that enables it to detect the activity of other NR and LTE devices in its vicinity when performing resource selection via Mode 2. This means that the NR device may have to monitor two overlapping resource pools and decode both the LTE SCI (sidelink control information) sent in the LTE-V2X resource pool and the NR SCI sent in the NR-V2X resource pool. From these SCIs, the NR device will then be aware of future transmissions of other surrounding devices and can therefore determine which resources will be available for its own NR-V2X sidelink transmissions (i.e., resources that should not be excluded). In addition, in NR sidelink operation, some PSCCH / PSSCH transmissions may be configured to request HARQ feedback from the intended receiver. This means that the intended NR receiver will use the associated PSFCH (physical sidelink feedback channel) resources to provide HARQ feedback when decoding the SCI associated with the PSCCH / PSSCH transmission. Now, when the NR-V2X and LTE-V2X resource pools overlap, the resources where the PSFCH transmission occurs may also overlap with the resources used for LTE sidelink transmissions.

[0152] However, since the NR device will select resources where it can perform its NR PSCCH / PSSCH transmissions without interfering with other NR PSCCH / PSSCH transmissions, it will not consider whether the associated PSFCH resources will be available for the NR receiver to provide HARQ feedback (e.g., due to the transmission from the LTE sidelink device overlapping the associated PSFCH resources). This overlap between the NR PSFCH transmission and the LTE SL transmission may affect the efficiency of the sidelink of the LTE device and the NR device, and the NR device will suffer interference and also result in the inability to send HARQ feedback.

[0153] According to an exemplary embodiment of the present invention, a mechanism for determining resources that can be used for NRPSCCH / PSSCH transmission with HARQ feedback is proposed. According to the proposed mechanism, simultaneous sensing of both LTE and NR side link resource pools is performed by the device. This is accomplished by simultaneous decoding of both LTE SCI and NR SCI. (The background assumption is that such a device has modules that allow it to use V2X side link transmissions for both LTE and NR, and that these modules can communicate and exchange information between them). Sensing applied to the LTE side link resource pool allows the NR module to identify future LTE-V2X side link transmissions and determine the resources that can be used for NR PSCCH / PSSCH transmissions and be configured to request HARQ feedback.

[0154] The NR-V2X sidelink module utilizes information from the LTE-V2X sidelink resource pool activity to determine not only which resources are available for NR PSCCH / PSSCH transmissions, but also whether the NR PSCCH / PSSCH transmissions occurring on those resources can be configured to request HARQ feedback (i.e., by using the NR-V2X sidelink resource pool configuration to identify in which time slots and subchannels the PSFCH resources are configured to occur). In practice, this means that the NR-V2X sidelink module, when performing resource exclusion of candidate resources for NR PSCCH / PSSCH transmissions based on sensing of both the NR-V2X and LTE-V2X sidelink resource pools, identifies:

[0155] (i) whether the candidate resources overlap with resources indicated as being reserved for future (NR-V2X or LTE-V2X) sidelink transmissions, and

[0156] (ii) Whether the associated PSFCH resources overlap with resources indicated as reserved for future LTE-V2X sidelink transmissions.

[0157] Based on this process, the NR-V2X sidelink module can identify candidate resources that can be used for NR PSCCH / PSSCH transmission with HARQ feedback (e.g., candidate resources that do not satisfy any of the above conditions (i) and (ii)). Candidate resources that satisfy condition (ii) but do not satisfy condition (i) can be used for NR PSCCH / PSSCH transmission that does not require HARQ feedback.

[0158] However, even in the case where the TX believes that the candidate resources can be used for NR PSCCH / PSSCH transmissions with HARQ feedback enabled, there may be a sensing misalignment between the TX and RX. This misalignment may be due to the radio conditions at the RX being different from the radio conditions at the TX (e.g. due to hidden node issues), especially when the TX and RX are far apart. Therefore, in order to ensure that the LTE-V2X sidelink transmissions are protected (because the main task of LTE-V2X is basic road safety), it is proposed that the RX vehicle / module will have to actively sense the LTE-V2X sidelink resource pool (even when acting only in the role of RX) and identify from there whether PSFCH resources can be used. This information can then be used by the RX device to determine whether a PSFCH transmission should be performed in the PSFCH resources associated with the received NR PSCCH / PSSCH transmission.

[0159] A note on overlapping NR-V2X and LTE-V2X transmissions

[0160] In general, the overlap of NR-V2X and LTE-V2X SL transmissions may occur: i) only in time; or ii) in both time and frequency. In the former case, even if LTE-V2X and NR-V2X SL transmissions do not overlap in frequency, transmitting PSFCH in RBs adjacent to time-overlapping LTE SL transmissions may severely impact LTE reception due to RX AGC. However, if the PSFCH is sent in RBs that are sufficiently separated in frequency from the LTE-V2X SL transmissions, this will no longer be a problem. Therefore, NR-V2X SL devices should also consider the separation in frequency relative to time-overlapping LTE-V2X SL transmissions when evaluating whether a given PSFCH resource can be utilized for PSFCH transmissions.

[0161] In summary, PSFCH resources are assumed to overlap with LTE-V2X SL transmissions if the following conditions are met:

[0162] ● It overlaps with LTE-V2X SL transmissions in both time and frequency; or

[0163] ● It overlaps with LTE SL transmission only in time, but its distance from LTE-V2X SL transmission in frequency is less than X PRBs. Where X is:

[0164] ○ where X is a function of the performance of the LTE-V2X SL RX filter and the NR-V2X SL TX filter, which attenuate emissions outside the transmission bandwidth; or

[0165] ○X is the gap required to ensure sufficient orthogonality between LTE SL and NR SL;

[0166] ● It overlaps with LTE SL transmission only in time:

[0167] o This may be the case, since even if there is only an overlap in time (i.e., the PRBs for LTE SL and NR PSFCH do not overlap), the LTE SL reception may be severely degraded, since it is assumed that the RX receive gain of the LTE SL RX UE has been set during the first symbol of the LTE subframe. When the NR PSFCH transmission starts, the LTE SL RX UE will receive a much higher power,

[0168] This can lead to saturation and clipping.

[0169] Before describing in detail example embodiments of the present disclosure, Fig.17 , Fig.17 A simplified block diagram of various electronic devices suitable for practicing example embodiments of the present disclosure is illustrated as one possible and non-limiting exemplary system.

[0170] It should be noted that although Fig.17 Four UEs are shown, but this is not limiting and the performance according to the exemplary embodiment of the present invention may be represented by Fig.17 Any one or more applications in the UE.

[0171] Fig.17 A block diagram of one possible and non-limiting exemplary system in which the exemplary embodiments of the present disclosure may be practiced is shown. Fig.17 In the embodiment, user equipment UE A, user equipment UE B, user equipment UE C and user equipment NN 12 are connected with Fig.17 Wireless network 1 or network 1 in wireless communication. Fig.17 The wireless network 1 or network 1 in the present invention may include a communication network, such as a mobile network, for example, a mobile network 1 or a first mobile network as disclosed herein. Fig.17 Any reference to wireless network 1 in the specification may be considered a reference to any wireless network disclosed herein. Fig.17 The wireless network 1 in the embodiment may also include hard-wired features as may be required by the communication network. UE is a wireless device that can access the wireless network, usually a mobile device. UE can be, for example, a mobile phone (or a "cell" phone) and / or a computer with mobile terminal functions. For example, UE or mobile terminal can also be a portable, pocket-sized, handheld, computer-embedded, vehicle-mounted mobile device or air device, and performs voice signaling and / or data exchange with RAN.

[0172] UE A (user equipment A) includes one or more processors DP 10A, one or more memories MEM 10B and one or more transceivers TRANS10D interconnected by one or more buses. Each of the one or more transceivers TRANS10D includes a receiver and a transmitter. One or more buses can be address, data or control buses, and can include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, optical fiber or other optical communication equipment, etc. One or more transceivers TRANS10D can be optionally connected to one or more antennas to communicate with UE B, UE C and / or NN 12 respectively. One or more memories MEM 10B include computer program code PROG 10C. UE A communicates with UE B, UE C and / or NN 12 via wireless links 5, 7 or 15 respectively. One or more memories MEM 10B and computer program code PROG 10C are configured to use one or more processors DP 10A to make UE A perform one or more operations as described herein.

[0173] UE B (user equipment B) includes one or more processors DP 5A, one or more memories MEM 5B and one or more transceivers TRANS 5D interconnected by one or more buses. Each of the one or more transceivers TRANS 5D includes a receiver and a transmitter. One or more buses can be address, data or control buses, and can include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, optical fiber or other optical communication equipment, etc. One or more transceivers TRANS 5D can be optionally connected to one or more antennas to communicate with UE A, UE C and / or NN 12 respectively. One or more memories MEM 5B include computer program code PROG 5C. UE B communicates with UE A, UE C and / or NN 12 via wireless links 7, 6 or 11 respectively. One or more memories MEM 5B and computer program code PROG 5C are configured to utilize one or more processors DP 5A to enable UE B to perform one or more operations as described herein.

[0174] UE C (User Equipment C) is connected to Fig.17 A network node for communicating with the NN 12, UE B and / or UE A of the wireless network 1. UE C may be associated with a mobility function device such as an AMF or SMF. In addition, UE C may include an NR / 5GNodeB or a possible evolved NB, i.e., a base station (such as a primary or secondary node base station (e.g., for NR or LTE)) for communicating with the NN 12 and / or UE B and / or UE A of the wireless network 1. UE C includes one or more processors DP 13A, one or more memories MEM 13B, one or more network interfaces, and one or more transceivers TRANS12D interconnected by one or more buses. According to an example embodiment, these network interfaces of UE C may include X2 and / or Xn interfaces and / or other interfaces for executing the example embodiments of the present disclosure. Each of the one or more transceivers TRANS13D includes a receiver and a transmitter optionally connected to one or more antennas. The one or more memories MEM 13B include a computer program code PROG 13C. For example, one or more memories MEM 13B and computer program code PROG 13C are configured to use one or more processors DP 13A to cause UE C to perform one or more operations as described herein. UE C can communicate with UE A, UE B and / or NN 12 or any other device using, for example, at least link 15 and / or link 6. Fig.17The links 15, 8 or 6 shown in the figure can be used for communication between UE C and UE A, UE B and / or NN 12. It should be noted that any link disclosed herein can include one or more side link links. In addition, any of these links.

[0175] NN 12 (NR / 5G NodeB, evolved NB, or LTE or NR equipment) is such as with Fig.17 A network node of a primary or secondary node base station (e.g., for NR or LTE long term evolution) for communicating with devices of UE A, UE B, and / or UE C. NN12 provides access to a wireless network 1 for wireless devices such as UE A, UE B, and / or UE C. NN 12 includes one or more processors DP 12A, one or more memories MEM 12B, and one or more transceivers TRANS12D interconnected by one or more buses. According to an example embodiment, these TRANS12D may include X2 and / or Xn and / or other interfaces for executing an example embodiment of the present disclosure. Each of the one or more transceivers TRANS12D includes a receiver and a transmitter. One or more transceivers TRANS12D may optionally be connected to one or more antennas to communicate via at least link 11 and / or link 5 and / or link 8. TRANS12D may be connected to UE B and / or UE A via link 11 or link 5, respectively. The one or more memories MEM 12B and the computer program code PROG 12C are configured to utilize the one or more processors DP 12A to cause the NN 12 to perform one or more operations as described herein. The NN 12 may communicate with another gNB or eNB or a device such as UE A, UE B and / or UE C, such as via links 8, 11 and / or 5. In addition, any link as disclosed herein may be wired or wireless or both. In addition, any link as disclosed herein may be configured to pass through other network devices, such as but not limited to SGW / AMF / UPF devices, such as Fig.17 MME / SGW / UDM / PCF / AMF / SMF / LMF 14. NN 12 may perform the functions of a mobility management entity (MME), a serving gateway (SGW), a unified data management (UDM), a policy control function (PCF), a user plane function (UPF), an access and mobility management function (AMF) and / or a location management function (LMF) of LTE and similar functions of 5G and NR.

[0176] It should be noted that UE A, UE B, UE C and / or NN 12 may be configured (e.g., based on standard implementations, etc.) to perform location management functions (LMF). The LMF function may be embodied in UE A, UE B, UE C and / or NN 12, or may be part of these network devices or other devices associated with these devices. In addition, LMF (such as Fig.17 The MME / SGW / UDM / PCF / AMF / SMF / LMF 14 of the LMF) (as described at least below) may be co-located with UE A, UE B, UE C and / or NN 12 to separate the LMF from Fig.17 NN 12 and / or UE C for performing operations according to example embodiments of the present invention as disclosed herein.

[0177] These links, such as links 5, 6, 7, 8, 11, 15, 16, and 9, may be wired or wireless or both, and the links and / or other interfaces (such as Fig.17 or Fig.17 ) can implement Xn / X2, for example, the link 8 between UE A, UE B, UE C and / or NN 12 may include an X2 / Xn interface type link. In addition, as stated above, any of these links may pass through other network devices, such as but not limited to MME / SGW devices (such as Fig.17 MME / SGW / UDM / PCF / AMF / SMF / LMF 14). Fig.17 The MME / SGW / UDM / PCF / AMF / SMF / LMF 14 can be used to control Fig.17 Any function of any device in the devices of network 1 shown.

[0178] Fig.17 The one or more buses of the device may be address, data or control buses and may include any interconnection mechanism, such as a series of wires on a motherboard or integrated circuit, optical fiber or other optical communication devices, wireless channels, etc. For example, one or more transceivers TRANS12D, TRANS13D, TRANS 5D and / or TRANS10D may be implemented as a remote radio head (RRH), where UE A, UE B, UE C and / or other elements of NN 12 are physically in a different location from the RRH, and, for example, one or more buses may be partially implemented as optical fiber cables to connect UE A, UE B, UE C and / or other elements of NN12 to the RRH.

[0179] It should be noted that although Fig.17Network nodes such as UE A, UE B, UE C and / or NN 12 are shown, but any of these nodes may be in communication with a different eNodeB or eNB or gNB (such as for LTE and / or NR) and will still be configurable to perform example embodiments of the present disclosure.

[0180] It is also noted that the description herein indicates that a "cell" performs functions, but it should be clear that the gNB forms a cell and / or the user equipment and / or the mobility management function device will perform these functions. In addition, a cell forms part of a gNB, and each gNB can have multiple cells.

[0181] The wireless network 1 or any network it may represent may or may not include an MME / SGW / UDM / PCF / AMF / SMF / LMF 14, which may include a mobility management entity (MME) and / or a serving gateway (SGW) and / or a unified data management (UDM) and / or a policy control function (PCF) and / or an access and mobility management function (AMF) and / or a session management function (SMF) and / or an authentication server function (AUSF) and / or a location management function (LMF), and which provides connectivity with another network such as a telephone network and / or a data communication network (e.g., the Internet), and which is configured to perform any 5G and / or NR operations at the time of this application, in addition to or in lieu of other standard operations. The MME / SGW / UDM / PCF / AMF / SMF / LMF 14 may be configured to perform operations according to an exemplary embodiment of the present disclosure in any of LTE, NR, 5G and / or any standard-based communication technologies being implemented or discussed at the time of this application. Furthermore, it is worth noting that the operations according to the example embodiments of the present disclosure as performed by the NN 12 and / or the UE C may also be performed at the MME / SGW / UDM / PCF / AMF / SMF / LMF 14 .

[0182] about Fig.17 The LMF function of the MME / SGW / UDM / PCF / AMF / SMF / LMF 14 receives measurement and assistance information from the communication network and the user equipment (UE). This can determine the location of the UE via the access and mobility management function (AMF) through the interface. Fig.17 UE B and / or UE A in the embodiment may communicate with LMF via at least any one of links 5, 6, 11 and / or 15. NN 12 may then further communicate via the following as needed: Fig.17 Link 16 or Link 9 in Fig.17 Communicate with MME / SGW / UDM / PCF / AMF / SMF / LMF 14's LMF.

[0183] It should be noted that link 16 or link 9 may include UE A, UE B, UE C and / or NN 12 and Fig.17 Any links required between the MME / SGW / UDM / PCF / AMF / SMF / LMF 14 so that any of these devices can be at least Fig.17 The LMF of the MME / SGW / UDM / PCF / AMF / SMF / LMF 14 communicates. In addition, it is worth noting that any link mentioned in this document may include a hardwired link and / or a wireless link, and as needed, and / or include any type of interface (e.g., LTE and / or 5G interface), such as but not limited to at least one of the Xn, X2, S1, NG, NG-C, NL, E1 and / or F1 type interfaces.

[0184] The MME / SGW / UDM / PCF / AMF / SMF / LMF 14 includes one or more processors DP 14A, one or more memories MEM 14B, and one or more network interfaces ((multiple) N / WI / F) interconnected by one or more buses coupled to at least the links 16 and 9. Communication between the NN 12 or UE C and the LMF may be performed via, for example, an access and mobility management function (AMF) of the MME / SGW / UDM / PCF / AMF / SMF / LMF 14. The control plane interface between the NN 12 and / or UE C (or gNB) and the AMF may be a NG-C interface and the interface between the AMF and the LMF may be a NL. According to an example embodiment, these network interfaces may include X2 and / or Xn and / or other interfaces for performing example embodiments of the present disclosure. The one or more memories MEM 14B include a computer program code PROG 14C. The one or more memories MEM 14B and the computer program code PROG 14C are configured to utilize the one or more processors DP 14A to cause the MME / SGW / UDM / PCF / AMF / SMF / LMF 14 to perform or work with the NN 12 or UE C to perform one or more operations that may be required to support operations according to example embodiments of the present disclosure.

[0185] The wireless network 1 can implement network virtualization, which is the process of combining hardware and software network resources and network functions into a single software-based management entity (virtual network). Network virtualization involves platform virtualization, usually in combination with resource virtualization. Network virtualization is classified into external virtualization and internal virtualization, where external virtualization combines many networks or parts of networks into virtual units, and internal virtualization provides network-like functions for software containers on a single system. Please note that the virtualized entities generated by network virtualization are still implemented to some extent using hardware (such as processors DP10, DP12A, DP13A, DP5A and / or DP14A and memories MEM 10B, MEM 12B, MEM 13B, MEM 5B and / or MEM 14B), and such virtualized entities also produce technical effects.

[0186] Computer readable memories MEM 12B, MEM 13B, MEM 5B, and MEM 14B may be of any type suitable for the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory, and removable memory. Computer readable memories MEM 12B, MEM 13B, MEM 5B, and MEM 14B may be components for performing storage functions. Processors DP10, DP12A, DP13A, DP5A, and DP14A may be of any type suitable for the local technical environment and, as non-limiting examples, may include one or more of a general-purpose computer, a special-purpose computer, a microprocessor, a digital signal processor (DSP), and a processor based on a multi-core processor architecture. Processors DP10, DP12A, DP13A, DP5A, and DP14A may be components for performing functions, such as controlling UE A, UE B, NN 12, UE C, and other functions as described herein.

[0187] In general, various embodiments of UE B and / or UE A may include, but are not limited to, a cell phone, such as a smart phone with wireless communication capabilities, a tablet computer, a personal digital assistant (PDA), a portable computer with wireless communication capabilities, an image capture device such as a digital camera with wireless communication capabilities, a gaming device with wireless communication capabilities, a music storage and playback device with wireless communication capabilities, an Internet device allowing wireless Internet access and browsing, a tablet computer with wireless communication capabilities, and a portable unit or terminal incorporating a combination of such functions.

[0188] In addition, various embodiments of UE A, UE B, or UE C may be used with a UE vehicle, an aerial platform station, or any other such node associated with a ground network, or any drone-type radio or radio in an aircraft or other aerial vehicle. According to an example embodiment of the present invention, UE B or UE A may be an anchor UE or a target UE.

[0189] TX proposed process

[0190] The process proposed from the TX perspective is Fig.15 Note that here we focus on the transmission of a single TB, which can be sent in a single transmission or with multiple retransmissions (blind retransmissions or retransmissions triggered by received HARQ feedback). The proposed process consists of the following steps:

[0191] 1. The TX UE performs continuous sensing in both the LTE-V2X and NR-V2X sidelink resource pools;

[0192] 2.TX UE collects sensing information:

[0193] a. from the LTE-V2X sidelink resource pool, which includes the reserved resources (including subframes, initial subchannels and number of reserved subchannels) and the RSRP measurements associated with the LTE SCI in which these reservations were made (PSSCH-RSRP);

[0194] b. from the NR-V2X sidelink resource pool, which includes the reserved resources (including time slots, initial subchannels and number of reserved subchannels) and the RSRP measurements associated with the NR SCI in which these reservations were made (PSCCH-RSRP or PSSCH-RSRP, depending on the (pre-)configuration parameter sl-RS-ForSensing);

[0195] 3. According to an example embodiment of the present invention, identifying an NR-V2X SL slot configured with PSFCH where overlapping LTE PSCCH / PSSCH transmissions are expected;

[0196] a. According to an example embodiment of the present invention, a PSFCH resource may be considered free (i.e., available) if the following conditions are met:

[0197] i. The RSRP measurement according to the received LTE SCI is below the RSRP threshold;

[0198] i. The RSRP threshold may be the same as the threshold used to determine whether a candidate resource is idle with respect to overlapping LTE PSCCH / PSSCH and / or NRPSCCH / PSSCH future transmissions, or it may be a separately configured threshold;

[0199] ii. The PSFCH resources do not overlap with the LTE PSCCH and the RSRP measurement based on the received LTE SCI is below the RSRP threshold, which indicates that the PSFCH reception will not be interfered by the LTE PSSCH transmission;

[0200] iii. The PSFCH resources do not overlap in time with the transmission of the CAM which the NR RX is expected to receive using its LTE RX counterpart, i.e. the NR TX attempts to select NRPSCCH / PSSCH resources associated with PSFCH resources that do not overlap in time with the LTE reception at the NR RX;

[0201] 4.TX receives payload / TB from upper layer;

[0202] 5. According to an example embodiment of the present invention, a candidate resource set is formed for NR PSCCH / PSSCH transmission:

[0203] a. Candidate resource set for NR PSCCH / PSSCH transmission with HARQ feedback - this will include all candidate (single slot) resources that do not overlap with reserved resources, where the associated PSFCH resources do not overlap with resources reserved for LTE PSCCH / PSSCH transmission;

[0204] b. Candidate resource set for NR PSCCH / PSSCH transmission without HARQ feedback - this will include all candidate (single slot) resources that do not overlap with reserved resources, where the associated PSFCH resources overlap with resources reserved for LTE PSCCH / PSSCH transmission;

[0205] 6. Select resources from candidate resource set 5.a or 5.b depending on whether the payload / TB requires HARQ feedback;

[0206] a. For example, for broadcast transmission, HARQ feedback is not configured, while for unicast transmission, HARQ feedback may or may not be configured. For multicast transmission, some form of HARQ feedback is always configured, otherwise it will have the same effect as broadcast;

[0207] b. According to an exemplary embodiment of the present invention, even if the payload / TB requires HARQ feedback, not every transmission of the payload / TB may require requesting HARQ feedback. Sometimes, it is better to mix HARQ feedback requests / no requests for the same TB, for example, if using PSFCH to find resources will cause a delay in the initial TX;

[0208] i. In the example for the same TB, the first two transfers can be

[0209] HARQ feedback, and the last transmission may have HARQ feedback.

[0210] The order of transmission of HARQ feedback may be changed depending on the availability of PSCCH / PSSCH resources with non-colliding associated PSFCHs;

[0211] ii. In the example, although the payload / TB requires HARQ feedback to be configured, if the TX UE expects a collision between the associated PSFCH and LTE PSCCH / PSSCH transmissions, it decides not to request HARQ feedback. In this case, the TX UE may decide to perform one or more blind retransmissions.

[0212] 7. Perform resource reselection check:

[0213] a. in accordance with an example embodiment of the present invention, when HARQ feedback is configured, evaluating the need to trigger resource reselection due to detection of a collision in PSCCH / PSSCH or associated PSFCH by continuing to decode PSCCH of other UEs in both NR-V2X and LTE-V2X sidelink resource pools;

[0214] i. For the cases of reselection checks due to resource re-evaluation (i.e., before initial transmission of TX) and resource preemption (i.e., after initial transmission of TX), the following applies;

[0215] i. (Regarding LTE-V2X monitoring according to an example embodiment of the present invention) Resource re-evaluation of the selected PSCCH / PSSCH resources of the TX includes an evaluation of the SCI (i.e. PSCCH) in both the NR-V2X and LTE-V2X sidelink resource pools to check whether its intended transmission is still suitable, taking into account late SCIs. In the case of NR-V2X, these late SCIs will typically be associated with non-periodic higher priority services that started transmitting after the end of the original sensing window of the TX. The RSRP threshold used to evaluate whether late SCIs in the NR-V2X and LTE-V2X sidelink resource pools overlap with the PSCCH / PSSCH resources selected by the TX can be:

[0216] a. The same for both NR-V2X and LTE-V2X, and is configured as part of the NR-V2X (pre) configuration;

[0217] b. Different for NR-V2X and LTE-V2X, where NR-V2X and LTE-V2X RSRP are different in NR-V2X (pre-)

[0218] Configure separately in configuration;

[0219] ii. According to an example embodiment of the present invention, the resource re-evaluation of the TX-selected PSFCH relative to the activity in the LTE-V2X sidelink resource pool and the associated RSRP threshold used to evaluate it may:

[0220] a. Use the same RSRP threshold as for PSCCH / PSSCH re-evaluation; or

[0221] b. Use a dedicated RSRP threshold for PSFCH; or

[0222] c. Use and for selecting candidate single time slot resources (ie

[0223] RSRP thresholds that are different from the RSRP thresholds for PSCCH / PSSCH);

[0224] d. Use an RSRP threshold that depends on whether the PSFCH resource overlaps with the LTE PSCCH;

[0225] iii. According to an example embodiment of the present invention, a resource re-evaluation of the PSFCH selected by the TX is performed to confirm that the PSFCH resources do not overlap in time with the transmission of the CAM which the NR RX is expected to receive using its LTE RX counterpart, i.e. the NR TX attempts to select NR PSCCH / PSSCH resources associated with PSFCH resources that do not overlap in time with the LTE reception at the NR RX;

[0226] b. in accordance with an example embodiment of the present invention, when HARQ feedback is not configured, evaluating the need to trigger resource reselection due to detection of a conflict in PSCCH / PSSCH by continuing to decode PSCCH of other UEs in both NR-V2X and LTE-V2X sidelink resource pools;

[0227] i. (Regarding LTE-V2X monitoring according to an example embodiment of the present invention) Follow the same process as in step 7.aii;

[0228] 8. If resource reselection is triggered, execute step 5 again. Otherwise, proceed to step 9;

[0229] a. According to an example embodiment of the present invention, if the resource reselection trigger identifies that the PSCCH / PSSCH resources are still valid, but the mapped PSFCH is not due to the detection of the expected LTE PSCCH / PSSCH overlap, the TX can reconstruct the second stage SCI so that HARQ feedback is not requested for this transmission. This applies to the case where the resource reselection check is performed due to re-evaluation or preemption;

[0230] 9. Performing transmission in the selected candidate single-slot resource and using the associated HARQ configuration (i.e., whether HARQ feedback is required);

[0231] a. In the case of multiple reserved resources, the transmission will also indicate the first phase

[0232] Future resources in SCI;

[0233] b. According to an example embodiment of the present invention, TX may also indicate in the SCI (i.e., a 1-bit indication on the first stage SCI or the second stage SCI) whether RX should also evaluate whether the PSFCH resources will overlap with LTE PSCCH / PSSCH transmissions;

[0234] i. This indication may be triggered due to the TX detecting a possible mismatch between the TX and RX radio environments due to:

[0235] i. TX and RX are separated by a distance above a configured threshold (e.g., based on positioning available from the CAM at the V2X layer);

[0236] ii. Absolute or relative (relative to RX) speed of TX (e.g. based on positioning available from CAM at the V2X layer);

[0237] a. For aperiodic traffic, it is very important to have fresh sensing results even if the relative velocity is zero. On the contrary, for periodic traffic, it is not so important to have sensing results, especially in the case where all surrounding devices perform only periodic transmissions. However, as long as there is a mixture of aperiodic and periodic traffic, then having fresh sensing results is crucial;

[0238] iii. The current location of the TX (e.g., in an urban scenario, the likelihood of NLoS conditions will be higher than that of a highway);

[0239] ii. Another condition may be based on whether the goal is to protect LTE-V2X transmission (in which case the NR RX UE should be the one doing the evaluation of suitability for PSFCH) or to protect NR RX UE reception by ensuring that HARQ feedback can be transmitted (in which case the suitability of the NR TX to do PSFCH detection will be more important);

[0240] 10. In case of multiple reserved resources, continue to (re)transmit TBs in these resources;

[0241] 11. The TX UE waits to receive HARQ feedback when performing a transmission configured with HARQ feedback;

[0242] 12. If HARQ feedback is received:

[0243] a. After receiving ACK, go to step 13;

[0244] b. After receiving NACK, go to step 15;

[0245] c. No HARQ feedback is received, and the process goes to step 14;

[0246] 13. The transmission has been successfully received (i.e., an ACK is received), so the TX can turn off that particular HARQ process;

[0247] a. In the event of any additional reserved resources, the TX UE may re-use them to transmit another TB, or in the event of no further traffic, simply abandon the reservation(s) (i.e., no further transmission will occur);

[0248] 14. HARQ feedback not received:

[0249] a. According to an example embodiment of the present invention, the TX monitors (even after re-evaluation) whether there are LTE PSCCH / PSSCH transmissions overlapping with the associated PSFCH resource(s).

[0250] i. If there is no LTE PSCCH / PSSCH transmission, the TX will initiate a retransmission if the allowed number of retransmissions has not been exceeded;

[0251] ii. If there is LTE PSCCH / PSSCH transmission and there is a secondary PSFCH mapping, wait to receive HARQ feedback at these resources;

[0252] i. Note that in this case, the NR SL device operating in overlapping resources is provided with multiple PSFCH mappings, consisting of a primary mapping and a secondary mapping. The primary mapping corresponds to the original PSCCH / PSSCH mapping, while the secondary mapping corresponds to the additional PSFCH resources;

[0253] iii. If there is an LTE PSCCH / PSSCH transmission, the HARQ feedback is NACK only, and no NACK feedback is received, the TX UE may assume that the RX UE(s) had NACKs to send, but did not send them because they also sensed the overlapping LTE PSCCH / PSSCH transmission.

[0254] 15. In case there are additional reserved resources, then TX will utilize these resources for TB retransmission and transition to step 6. In case there are no additional reserved resources, then TX will have to trigger a new resource selection and will therefore transition to step 5.

[0255] RX proposed process

[0256] The process proposed from the RX perspective is Fig.16 is shown in the figure and consists of the following steps:

[0257] 1. The RX UE performs continuous sensing in both the LTE-V2X and NR-V2X sidelink resource pools;

[0258] 2. RX UE collects sensing information:

[0259] a. from the LTE-V2X sidelink resource pool, which includes the reserved resources (including subframes, initial subchannels and number of reserved subchannels) and the RSRP measurements associated with the LTE SCI in which these reservations were made (PSSCH-RSRP);

[0260] b. from the NR-V2X sidelink resource pool, which includes the reserved resources (including time slots, initial subchannels and number of reserved subchannels) and the RSRP measurements associated with the NR SCI in which these reservations were made (PSCCH-RSRP or PSSCH-RSRP, depending on the (pre-)configuration parameter sl-RS-ForSensing);

[0261] 3. According to an example embodiment of the present invention, identify NR SL slots configured with PSFCH where overlapping LTE PSCCH / PSSCH transmissions are expected. This can be achieved by performing continuous sensing by RX;

[0262] a. Note that in case of multicast, different RXs will have different PSFCH resources (e.g., different PRBs), and thus not all multicast RX members may suffer from overlap. Assume that the RX process is applied independently at each RX;

[0263] 4. The RX UE receives the NR PSCCH / PSSCH transmission and attempts to decode it;

[0264] 5. The RX UE determines whether the received SCI requires HARQ feedback;

[0265] 6. If HARQ feedback is not required, the RX UE will continue to monitor the resource pool regardless of whether the NR PSSCH payload is decoded;

[0266] 7. According to an example embodiment of the present invention, whether the corresponding PSFCH resources are free is evaluated based on whether an LTE PSCCH / PSSCH transmission is expected to occur in the same resource as the PSFCH associated with the received NR PSCCH / PSSCH transmission.

[0267] a. This assumes that the RX UE is performing continuous sensing and the goal is to identify a mismatch between the sensing at the TX (which results in the selection of PSCCH / PSSCH resources and associated PSFCH) and the sensing at the RX;

[0268] i. Please note that there may be alternatives for continuous sensing, but this is beyond the scope of the technical solutions proposed in this invention.

[0269] b. According to an example embodiment of the present invention, this step may depend on an indication from the TX UE in the SCI (i.e., a 1-bit indication on the first stage SCI or the second stage SCI) indicating whether the RX should also evaluate whether the PSFCH resources will overlap with the LTE PSCCH / PSSCH transmission. Alternatively, the execution of this step may be part of the NR-V2X configuration;

[0270] i. In an example, the RX UE may determine to sense the PSFCH resources if one or more triggers are present. These triggers may be the distance between the RX and TX UEs, the speed of the RX UE relative to the TX UE, and / or the location of the RX UE.

[0271] c. According to an exemplary embodiment of the present invention, it may be assumed that the PSFCH resources are idle if the following conditions are met:

[0272] i. The measured RSRP of LTE SCI is lower than the (pre-)configured RSRP threshold;

[0273] or

[0274] ii. PSFCH resources do not overlap with LTE PSCCH; or

[0275] iii. The PSFCH resources do not overlap with the LTE PSCCH and the measured RSRP of the LTE SCI is below the configured RSRP threshold;

[0276] 8. If the PSFCH resources are idle, proceed to step 9;

[0277] 9. Perform PSFCH transmission in the PSFCH resources associated with the received NR PSCCH / PSSCH;

[0278] 10. In case the PSFCH is deemed not idle, then the RX UE shall skip HARQ feedback transmission in the PSFCH resources associated with the received NR PSCCH / PSSCH transmission;

[0279] 11. Since there is no transmission of HARQ feedback in the associated PSFCH resources, the following embodiments may be applied;

[0280] a. NR SL devices operating in overlapping resources are provided with multiple PSFCH mappings, consisting of a primary mapping and a secondary mapping. The primary mapping corresponds to the original PSCCH / PSSCH mapping, while the secondary mapping corresponds to additional PSFCH resources, which can occur:

[0281] i. At a later time in the overlapping resources, e.g., some PSFCH RBs in later PSFCH symbols have a direct mapping to the original NR PSCCH / PSSCH resources;

[0282] ii. At the same time (i.e. the same PSFCH symbol), but in an RB with no overlap between LTE PSCCH / PSSCH and NR PSFCH;

[0283] iii. or a combination thereof;

[0284] b. According to an example embodiment of the present invention, when RX performs its transmission to the original TX in the role of TX (e.g., in the case of bidirectional communication), it can include in its payload an indication of whether the previous transmission of TX has been successfully decoded (e.g., in the second stage SCI or MAC CE). TX can then use this information to trigger a retransmission;

[0285] i. In case of HARQ feedback based on MAC CE or second stage SCI, a timer may be introduced to help the TXUE decide whether it needs to trigger a HARQ retransmission via any of these means (due to lack of HARQ feedback);

[0286] Fig.18A , 18B , 18C and Fig.18D Each shows a method according to an exemplary embodiment of the present invention, which method can be performed by an apparatus.

[0287] Fig.18A The diagram shows that a side link transmission device (e.g., Fig.17 Operations performed by a device of UE A, UE B and / or UE C in the example. Fig.18A As shown in step 1810 of , sensing of reserved resources in both the first side link radio access technology resource pool and the second side link radio access technology resource pool is performed by the user equipment. Fig.18A As shown in step 1815 of , based on sensing, according to an indication that resources are not being used for transmission by at least one other user equipment of the first sidelink radio access technology resource pool, at least one candidate resource set is formed that identifies all resources that are free for use by the first radio access technology resource pool. Fig.18AAs shown in step 1820, for each resource in at least one candidate resource set, a corresponding resource to be used for a physical sidelink feedback channel of a first sidelink radio access technology resource pool is identified. Fig.18A As shown in step 1825 of , based on the sensing, excluding from the at least one candidate resource set all resources where the physical sidelink feedback channel resources are identified as being reserved for transmission by at least one other user equipment of the first sidelink radio access technology resource pool. Then Fig.18A As shown in step 1830, resources to be used for transmission of the physical sidelink control channel and the physical sidelink shared channel are selected from at least one candidate resource set.

[0288] According to an example embodiment as described in the above paragraphs, in a first side link radio access technology resource pool, a sensing evaluation is performed to determine whether reservation of future resources is indicated in received side link control information; and the validity of the reservation is also evaluated based on a measurement of a reference signal received power associated with the received side link control information.

[0289] According to an example embodiment as described in the above paragraphs, wherein the validity of the resource reservation is made by comparing a measurement of a received reference signal power associated with the received sidelink control information with a first sidelink reference signal received power threshold.

[0290] According to an example embodiment as described in the above paragraphs, in a first side link radio access technology resource pool, a sensing evaluation of physical side link feedback channel resources corresponding to resources in a candidate resource set is performed: whether the reservation of the physical side link feedback resources is indicated in the received side link control information; and the validity of the reservation is also evaluated based on a measurement of a reference signal received power associated with the received side link control information.

[0291] According to an example embodiment as described in the above paragraphs, wherein the validity of the resource reservation is made by comparing a measurement of a reference signal received power associated with the received sidelink control information with a second sidelink reference signal received power threshold.

[0292] According to an example embodiment as described in the above paragraphs, exclusion of resources from at least one candidate resource set is based on sensing that the corresponding physical sidelink feedback channel resources are identified as reserved for transmissions of at least one other user equipment of the first sidelink radio access technology resource pool, and the reference signal reception power associated with the transmissions of the other user equipment of the first sidelink radio access technology resource pool and the received sidelink control information is completed in correlation with being higher than a second sidelink reference signal reception power threshold.

[0293] According to an example embodiment as described in the above paragraphs, wherein the transmission of at least one other user equipment of the first sidelink radio access technology resource pool is a cooperation awareness message.

[0294] According to an example embodiment as described in the above paragraphs, wherein the exclusion is based on an identification of the occurrence of at least one of the following: whether the candidate resources overlap with resources of an upcoming at least one of a physical side link control channel and a physical side link shared channel transmission indicated as being reserved for the first side link radio access technology resource pool or the second side link radio access technology resource pool, or whether the associated at least one physical side link feedback channel resource overlaps with resources of an upcoming at least one of a physical side link control channel and a physical side link shared channel transmission indicated as being reserved for the first side link radio access technology resource pool.

[0295] According to the example embodiment as described in the above paragraphs, wherein the resource time excluding the identification of the physical side link feedback channel resources does not overlap with the transmission of the cooperative sensing message, the new radio reception is expected to use the first side link radio access technology resource pool receiving counterpart to receive the cooperative sensing message.

[0296] According to the exemplary embodiment as described in the above paragraphs, at least one candidate resource set includes a first group of resources capable of configuring hybrid automatic repeat request feedback, and a second group of resources capable of not configuring hybrid automatic repeat request feedback.

[0297] According to an example embodiment as described in the above paragraphs, based on sensing that a first sidelink radio access technology resource pool resource pool has available associated resources for a physical sidelink shared channel, resources within at least one candidate resource set capable of configuring hybrid automatic repeat request feedback are evaluated.

[0298] According to an example embodiment as described in the above paragraphs, based on the sensing that the first side link radio access technology resource pool resource pool does not have available associated resources for the physical side link shared channel, resources within at least one candidate resource set that cannot be configured with hybrid automatic repeat request feedback are evaluated.

[0299] According to the example embodiment as described in the above paragraphs, when the transmitted payload requires hybrid automatic repeat request feedback, resources are selected from a set of candidate resources that can be configured with hybrid automatic repeat request feedback; otherwise, resources are selected from a set of candidate resources that cannot be configured with hybrid automatic repeat request.

[0300] According to an example embodiment as described in the above paragraphs, wherein the first sidelink radio access technology resource pool and the second sidelink radio access technology resource pool overlap each other in at least one of time or frequency.

[0301] A non-transitory computer readable medium (such as Fig.17 MEM 10B, MEM 5B and / or MEM 13B) store program code (such as Fig.17 PROG 10C, PROG 5C and / or PROG 13C), the program code is executed by at least one processor (such as Fig.17 DP 10A, DP 5A and / or DP 13A) in the processor are executed to perform operations as described at least in the above paragraphs.

[0302] According to an exemplary embodiment of the present invention, as described above, there is an apparatus comprising: a user device (such as Fig.17 UE A, UE B and / or UE C in the process execute (eg Fig.17 TRANS10D, TRANS 5D and / or TRANS13D in the first side link radio access technology resource pool and the second side link radio access technology resource pool (such as TRANS10D, TRANS 5D and / or TRANS13D in the second side link radio access technology resource pool; MEM 10B, MEM 5B and / or MEM 13B; PROG 10C, PROG 5C and / or PROG 13C; and DP 10A, DP 5A and / or DP 13A) sense the reserved resources in both the first side link radio access technology resource pool and the second side link radio access technology resource pool (such as Fig.17 TRANS10D, TRANS 5D and / or TRANS13D; MEM 10B, MEM 5B and / or MEM 13B; PROG 10C, PROG 5C and / or PROG 13C; and DP 10A, DP 5A and / or DP 13A); based on sensing, for forming (such as based on an indication that resources are not being used for transmission by at least one other user equipment of the first side link radio access technology resource pool). Fig.17 TRANS10D, TRANS 5D and / or TRANS13D in the first radio access technology resource pool; MEM 10B, MEM 5B and / or MEM 13B; PROG 10C, PROG 5C and / or PROG 13C; and DP 10A, DP 5A and / or DP 13A) identify at least one candidate resource set of all resources to be freely used by the first radio access technology resource pool; for each resource identifier (such as Fig.17TRANS10D, TRANS 5D and / or TRANS13D in; MEM 10B, MEM 5B and / or MEM 13B; PROG 10C, PROG 5C and / or PROG 13C; and DP 10A, DP 5A and / or DP 13A) are to be used for corresponding resources of the physical side link feedback channel of the first side link radio access technology resource pool; based on sensing, for excluding (such as) from at least one candidate resource set Fig.17 TRANS10D, TRANS 5D and / or TRANS13D; MEM 10B, MEM 5B and / or MEM 13B; PROG 10C, PROG 5C and / or PROG 13C; and DP10A, DP 5A and / or DP 13A) physical sidelink feedback channel resources are identified as all resources reserved for transmission by at least one other user equipment of the first sidelink radio access technology resource pool; and for selecting (such as) from at least one candidate resource set Fig.17 TRANS10D, TRANS 5D and / or TRANS13D; MEM 10B, MEM 5B and / or MEM 13B; PROG 10C, PROG 5C and / or PROG 13C; and DP 10A, DP 5A and / or DP 13A) are components for resources to be used for transmission of physical side link control channels and physical side link shared channels.

[0303] In an exemplary aspect of the invention according to the above paragraphs, wherein at least the means for executing, forming, identifying and selecting comprises a non-transitory computer readable medium [such as Fig.17 MEM 10B, MEM 5B and / or MEM 13B], which is encoded with a computer program [such as Fig.17 PROG 10C, PROG 5C and / or PROG 13C], the computer program can be executed by at least one processor [such as Fig.17 DP 10A, DP 5A and / or DP 13A] are executed.

[0304] Fig.18B The diagram shows a device that can be used, such as but not limited to a side link receiving device (e.g., Fig.17 Operations performed by a device of UE A, UE B and / or UE C in the example. Fig.18B As shown in step 1835, a resource for transmission is selected from a candidate resource set that cannot be configured with hybrid automatic repeat request feedback. Fig.18BAs shown in step 1840 of , sensing the first side link radio access technology resource pool and the second side link radio access technology resource pool until a moment before the start of transmission in the selected resource; and at least one of the following: Fig.18B As shown in step 1845 of , if the condition of the resource reselection trigger is not met during the sensing period, the transmission of the physical side link control channel and the physical side link shared channel is performed in the selected resource, or as shown in step 1846 of . Fig.18B As shown in step 1850 of , resource reselection is performed based on a condition that a resource reselection trigger is satisfied during the sensing period.

[0305] According to an example embodiment as described in the above paragraphs, the condition of the resource reselection trigger is based on at least one of the following: the selected resources are identified as reserved for transmission of a physical sidelink control channel, or a physical sidelink shared channel of a first sidelink radio access technology resource pool.

[0306] A non-transitory computer readable medium (such as Fig.17 MEM 10B, MEM 5B and / or MEM 13B) store program code (such as Fig.17 PROG 10C, PROG 5C and / or PROG 13C), the program code is executed by at least one processor (such as Fig.17 DP 10A, DP 5A and / or DP 13A) in the processor are executed to perform operations as described at least in the above paragraphs.

[0307] According to an exemplary embodiment of the present invention, as described above, there is an apparatus comprising: for selecting (eg, Fig.17 TRANS10D, TRANS 5D and / or TRANS13D; MEM 10B, MEM 5B and / or MEM 13B; PROG 10C, PROG 5C and / or PROG 13C; and DP 10A, DP 5A and / or DP 13A) for transmitting resources; for sensing (such as Fig.17TRANS10D, TRANS 5D and / or TRANS13D; MEM 10B, MEM 5B and / or MEM 13B; PROG 10C, PROG 5C and / or PROG 13C; and DP10A, DP 5A and / or DP 13A) a first side link radio access technology resource pool and a second side link radio access technology resource pool until a moment before the start of transmission in the selected resource; and a component for at least one of the following: if the condition of the resource reselection trigger is not met during the sensing period, performing (such as Fig.17 TRANS10D, TRANS 5D and / or TRANS13D in; MEM 10B, MEM 5B and / or MEM 13B; PROG 10C, PROG 5C and / or PROG 13C; and DP 10A, DP 5A and / or DP 13A) transmission of the physical side link control channel and the physical side link shared channel, or based on the condition that the resource reselection trigger is met during the sensing period (such as Fig.17 TRANS 10D, TRANS 5D and / or TRANS 13D; MEM 10B, MEM 5B and / or MEM 13B; PROG10C, PROG 5C and / or PROG 13C; and DP 10A, DP 5A and / or DP 13A) resources are reselected.

[0308] In an exemplary aspect of the invention according to the above paragraphs, wherein at least the means for selecting, sensing and executing comprises a non-transitory computer readable medium [such as Fig.17 MEM 10B, MEM 5B and / or MEM 13B], which is encoded with a computer program [such as Fig.17 PROG 10C, PROG 5C and / or PROG 13C], the computer program can be executed by at least one processor [such as Fig.17 DP 10A, DP 5A and / or DP 13A] are executed.

[0309] Fig.18C The diagram shows a device that can be used, such as but not limited to a side link receiving device (e.g., Fig.17 Operations performed by UE A, UE B and / or UE C in the example. Fig.18C As shown in step 1855 of , a resource for transmission is selected from a set of candidate resources capable of configuring hybrid automatic repeat request feedback. Fig.18C As shown in step 1860 of , sensing the first sidelink radio access technology resource pool resource pool until a moment before the start of transmission in the selected resource. Fig.18CAs shown in step 1865 of , based on the condition of the resource reselection trigger not being met during the sensing period, transmission of the physical side link control channel and the physical side link shared channel is performed in the selected resource. Fig.18C As shown in step 1870, resource reselection is performed based on the condition that a resource reselection trigger is satisfied during the sensing period.

[0310] According to an example embodiment as described in the above paragraphs, the condition of the resource reselection trigger is at least one of the following: the selected resources are identified as reserved for transmission of a physical side link control channel or a physical side link shared channel of a first side link radio access technology resource pool, and the physical side link feedback channel resources associated with the selected resources are identified as reserved for transmission of a physical side link control channel or a physical side link shared channel of the first side link radio access technology resource pool.

[0311] According to an example embodiment as described in the above paragraphs, when it is determined that the condition of the resource reselection trigger is met for a situation in which the physical sidelink feedback channel resources associated with the selected resources are identified as reserved for transmission of a physical sidelink control channel or a physical sidelink shared channel of a first sidelink radio access technology resource pool, it is determined not to request hybrid automatic repeat request feedback and to continue transmission on the initially selected resources.

[0312] A non-transitory computer readable medium (such as Fig.17 MEM 10B, MEM 5B and / or MEM 13B) store program code (such as Fig.17 PROG 10C, PROG 5C and / or PROG 13C), the program code is executed by at least one processor (such as Fig.17 DP 10A, DP 5A and / or DP 13A) in the processor are executed to perform operations as described at least in the above paragraphs.

[0313] According to an exemplary embodiment of the present invention, as described above, there is an apparatus comprising: for selecting (eg, Fig.17 TRANS10D, TRANS 5D and / or TRANS13D; MEM 10B, MEM 5B and / or MEM 13B; PROG 10C, PROG 5C and / or PROG 13C; and DP 10A, DP 5A and / or DP 13A) for transmitting resources; for sensing (such as Fig.17TRANS10D, TRANS 5D and / or TRANS13D in; MEM 10B, MEM 5B and / or MEM 13B; PROG 10C, PROG 5C and / or PROG 13C; and DP10A, DP 5A and / or DP 13A) a first side link radio access technology resource pool resource pool until a moment before the start of transmission in the selected resource; for performing (such as) in the selected resource based on the condition that the resource reselection trigger is not met during the sensing period Fig.17 TRANS10D, TRANS 5D and / or TRANS13D in; MEM 10B, MEM5B and / or MEM 13B; PROG 10C, PROG 5C and / or PROG 13C; and DP 10A, DP 5A and / or DP 13A) a component for transmission of a physical side link control channel and a physical side link shared channel; and a component for executing (such as) a condition that a resource reselection trigger is satisfied during sensing. Fig.17 TRANS10D, TRANS 5D and / or TRANS13D; MEM 10B, MEM5B and / or MEM 13B; PROG 10C, PROG 5C and / or PROG 13C; and DP 10A, DP 5A and / or DP 13A) resource reselection components.

[0314] In an exemplary aspect of the invention according to the above paragraphs, wherein at least the means for selecting, sensing and executing comprises a non-transitory computer readable medium [such as Fig.17 MEM 10B, MEM 5B and / or MEM 13B], which is encoded with a computer program [such as Fig.17 PROG 10C, PROG 5C and / or PROG 13C], the computer program can be executed by at least one processor [such as Fig.17 DP 10A, DP 5A and / or DP 13A] are executed.

[0315] Fig.18D The diagram shows that a network device such as, but not limited to, a network device (e.g., Fig.17 The operation performed by the device in NN 12). Fig.18D As shown in step 1875 of , sensing of reserved resources in both the first side link radio access technology resource pool and the second side link radio access technology resource pool is performed by the network device. Fig.18D As shown in step 1880 of , a sidelink timeslot configured with a physical sidelink feedback channel resource in which at least one transmission from at least one other user equipment of the first sidelink radio access technology resource pool is expected is identified from the second sidelink radio access technology resource pool. Fig.18D As shown in step 1885 of , a physical sidelink control channel and a physical sidelink shared channel transmission are received from a second sidelink radio access technology resource pool. Fig.18D As shown in step 1890 of , determining that the received transmission from the second sidelink radio access technology resource pool requests hybrid automatic repeat request feedback in a physical sidelink feedback channel resource mapped to the resource in which the transmission from the second sidelink radio access technology resource pool was received. Then as Fig.18D As shown in step 1895, it is determined based on the identification that the physical sidelink feedback channel resources of the second sidelink radio access technology resource pool are unavailable, and the hybrid automatic repeat request transmission mapped to the same physical sidelink feedback channel resources is skipped.

[0316] According to an example embodiment as described in the above paragraphs, in at least one of the first radio access technology resource pool or the second side link radio access technology resource pool, a sensing evaluation is performed as to whether reservation of future resources is indicated in received side link control information; and the validity of the reservation is also evaluated based on a measurement of a reference signal received power associated with the received side link control information.

[0317] According to an example embodiment as described in the above paragraphs, in a first side link radio access technology resource pool, sensing of physical side link feedback channel resources corresponding to resources in at least one candidate resource set is evaluated to determine whether reservation of the physical side link feedback channel resources is indicated in received side link control information; and the validity of the reservation is also evaluated based on a measurement of a reference signal received power associated with the received side link control information.

[0318] According to an example embodiment as described in the above paragraphs, based on determining that physical sidelink feedback channel resources of a second sidelink radio access technology resource pool are unavailable, hybrid automatic repeat request transmissions mapped to the same physical sidelink feedback channel resources are skipped based on an indication in sidelink control information associated with received physical sidelink control channel and physical sidelink shared channel transmissions from the second sidelink radio access technology resource pool.

[0319] According to an example embodiment as described in the above paragraphs, physical sidelink feedback channel resources are available based on at least one of the following assumptions: a measurement reference signal reception power of sidelink control information associated with the first sidelink radio access technology resource pool transmission is lower than a preconfigured threshold, the physical sidelink feedback channel does not overlap with a physical sidelink control channel transmitted by the first sidelink radio access technology resource pool, or the physical sidelink feedback channel does not overlap with a physical sidelink control channel transmitted by the first sidelink radio access technology resource pool, and a measurement reference signal reception power of evolved sidelink control information associated with the first sidelink radio access technology resource pool transmission is lower than a preconfigured threshold.

[0320] A non-transitory computer readable medium (such as Fig.17 MEM 12B in the storage device stores program code (such as Fig.17 PROG 12C in the example, the program code is executed by at least one processor (such as Fig.17 DP 14A) in is executed to perform operations as described at least in the above paragraphs.

[0321] According to an exemplary embodiment of the present invention, as described above, there is an apparatus comprising: a network device (such as Fig.17 NN 12) in execution (such as Fig.17 TRANS 12D, MEM 14B, PROG 14C and DP 14A in the first side link radio access technology resource pool and the second side link radio access technology resource pool are sensed (such as Fig.17 TRANS12D, MEM 14B, PROG 14C and DP 14A); for identifying (such as Fig.17 TRANS 12D, MEM 14B, PROG 14C and DP 14A in the first sidelink radio access technology resource pool are configured with a sidelink time slot of a physical sidelink feedback channel resource in which at least one transmission from at least one other user equipment of the first sidelink radio access technology resource pool is expected; and a component for receiving (such as) from the second sidelink radio access technology resource pool. Fig.17 TRANS12D, MEM 14B, PROG 14C and DP 14A) in the physical side link control channel and the physical side link shared channel transmission component; used to determine (such as Fig.17TRANS12D, MEM 14B, PROG 14C and DP14A in the second side link radio access technology resource pool) for receiving a transmission from the second side link radio access technology resource pool in a physical side link feedback channel resource mapped to the resource in which the transmission from the second side link radio access technology resource pool was received; and based on the identifier, determining (such as Fig.17 TRANS12D, MEM 14B, PROG14C and DP14A in the second sidelink radio access technology resource pool) are not available and components for skipping hybrid automatic repeat request transmissions mapped to the same physical sidelink feedback channel resources.

[0322] In an exemplary aspect of the invention according to the above paragraphs, wherein at least the means for executing, identifying, receiving and determining comprises a non-transitory computer readable medium [such as Fig.17 MEM 14B], which is encoded with a computer program [such as Fig.17 PROG 14C] in, the computer program can be executed by at least one processor [such as Fig.17 DP 14A] in is executed.

[0323] In addition, according to an exemplary embodiment of the present invention, there is a circuit for performing operations according to the exemplary embodiment of the present invention as disclosed herein. The circuit may include any type of circuit, including a content encoding circuit, a content decoding circuit, a processing circuit, an image generation circuit, a data analysis circuit, etc.). In addition, the circuit may include a discrete circuit, an application-specific integrated circuit (ASIC) and / or a field programmable gate array circuit (FPGA), etc., and a processor specifically configured by software to perform the corresponding functions, or a dual-core processor with software and a corresponding digital signal processor, etc.). In addition, the necessary inputs to the circuit and outputs from the circuit, the functions performed by the circuit, and the interconnection of the circuit with other components that may include other circuits (possibly via inputs and outputs) are provided to perform the exemplary embodiments of the present invention as described herein.

[0324] According to an exemplary embodiment of the present invention as disclosed in this application, the provided “circuit” may include at least one or more or all of the following:

[0325] (a) hardware circuit implementation only (such as implementation in analog and / or digital circuits only);

[0326] (b) a combination of hardware circuitry and software such as (where applicable):

[0327] (i) a combination of analog and / or digital hardware circuits and software / firmware; and

[0328] (ii) any portion of hardware processor(s) with software (including digital signal processor(s), software and memory(s) that work together to enable a device such as a mobile phone or server to perform various functions, such as functions or operations according to example embodiments of the present invention as disclosed herein); and

[0329] (c) Hardware circuit(s) and processor(s), such as microprocessor(s) or portion(s) of microprocessor(s), that require software (e.g., firmware) for operation but which may not be present when the software is not required for operation.”

[0330] According to an example embodiment of the present invention, there is sufficient circuitry for performing at least the novel operations as disclosed in this application, where "circuitry" may be used herein to refer to at least the following:

[0331] (a) hardware circuit implementation only (such as implementation in analog and / or digital circuits only); and

[0332] (b) a combination of circuitry and software (and / or firmware), such as (where applicable): (i) a combination of processor(s) or (ii) portions of processor(s) / software (including digital signal processor(s), software and memory(s) that work together to enable a device (such as a mobile phone or server) to perform various functions); and

[0333] (c) Circuit(s), such as microprocessor(s) or portion(s) of microprocessor(s), that require software or firmware to operate even if the software or firmware is not physically present.

[0334] The definition of "circuitry" applies to all uses of the term in this application, including in any claims. As a further example, as used in this application, the term "circuitry" would also cover an implementation of only a processor (or multiple processors) or a portion of a processor and its (or their) accompanying software and / or firmware. For example, and if applicable to a particular claim element, the term "circuitry" would also cover a baseband integrated circuit or an application processor integrated circuit for a mobile phone or a similar integrated circuit in a server, cell network device, or other network device.

[0335] In general, various embodiments may be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. For example, some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software, which may be executed by a controller, microprocessor, or other computing device, but the invention is not limited thereto. Although various aspects of the invention may be illustrated and described as block diagrams, flow charts, or illustrated and described using some other graphical representation, it is well understood that the blocks, devices, systems, techniques, or methods described herein may be implemented in hardware, software, firmware, dedicated circuits or logic, general purpose hardware or controllers or other computing devices, or some combination thereof, as non-limiting examples.

[0336] Embodiments of the present invention may be practiced in various components, such as integrated circuit modules. The design of integrated circuits is generally a highly automated process. Complex and powerful software tools are available to convert a logic level design into a semiconductor circuit design that is ready to be etched and formed on a semiconductor substrate.

[0337] As may be used herein, the word "exemplary" means "serving as an example, instance, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. All embodiments described in this detailed description are exemplary embodiments, which are provided to enable those skilled in the art to make or use the invention, without limiting the scope of the invention defined by the claims.

[0338] The foregoing description has provided by way of exemplary and non-limiting examples a complete and informative description of the best method and apparatus presently contemplated by the inventors for carrying out the invention. However, various modifications and adaptations may become apparent to those skilled in the relevant arts in view of the foregoing description when read in conjunction with the accompanying drawings and the appended claims. Nevertheless, all such and similar modifications of the teachings of the present invention will still fall within the scope of the present invention.

[0339] It should be noted that the terms "connected," "coupled," or any variations thereof, mean any connection or coupling (direct or indirect) between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" together. The coupling or connection between elements may be physical, logical, or a combination thereof. As employed herein, two elements may be considered to be "connected" or "coupled" together through the use of one or more wires, cables, and / or printed electrical connections, as well as through the use of electromagnetic energy, such as electromagnetic energy having wavelengths in the radio frequency region, microwave region, and optical (visible and invisible) region, as several non-limiting and non-exhaustive examples.

[0340] Furthermore, some of the features of the preferred embodiments of this invention may be used to advantage without the corresponding use of other features.Accordingly, the foregoing description should be regarded as merely illustrative of the principles of the present invention, and not in limitation thereof.

Claims

1. A method comprising: performing, by the user equipment, sensing of reserved resources in both the first sidelink radio access technology resource pool and the second sidelink radio access technology resource pool; forming, based on the sensing, at least one candidate resource set identifying all resources to be free for use by the first radio access technology resource pool in accordance with an indication that resources are not being used for transmission by at least one other user equipment of the first sidelink radio access technology resource pool; as well as for each of the resources in the at least one candidate resource set, identifying a corresponding resource to be used for a physical sidelink feedback channel of the first sidelink radio access technology resource pool; excluding, from said at least one candidate resource set, all said resources of said physical sidelink feedback channel resources identified as being reserved for said transmission by said at least one other user equipment of said first sidelink radio access technology resource pool based on said sensing; as well as Resources to be used for the transmission of a physical sidelink control channel and a physical sidelink shared channel are selected from the at least one candidate resource set.

2. The method according to claim 1, wherein in the first side link radio access technology resource pool, the sensing evaluation indicates whether future resources are reserved in the received side link control information; and the validity of the reservation is also evaluated based on the measurement of the reference signal received power associated with the received side link control information.

3. A method according to claim 2, wherein the validity of the resource reservation is made by comparing the measurement of the received reference signal power associated with the received sidelink control information with a first sidelink reference signal received power threshold.

4. The method of claim 1 , wherein in the first sidelink radio access technology resource pool, for the sensing evaluation of the physical sidelink feedback channel resources corresponding to the resources in the candidate resource set: whether the physical sidelink feedback resources are reserved as indicated in the received sidelink control information; and the method comprises: The validity of the reservation is also evaluated based on a measurement of a reference signal received power associated with the received sidelink control information.

5. A method according to claim 4, wherein the validity of the resource reservation is made by comparing the measurement of the reference signal received power associated with the received sidelink control information with a second sidelink reference signal received power threshold.

6. The method of claim 1 , wherein excluding the resource from the at least one candidate resource set is based on sensing that the corresponding physical sidelink feedback channel resource is identified as being reserved for the transmission of at least one other user equipment of the first sidelink radio access technology resource pool, and the reference signal received power associated with the transmission of the other user equipment of the first sidelink radio access technology resource pool and the received sidelink control information is completed in association with being higher than a second sidelink reference signal received power threshold.

7. The method of claim 1, wherein the transmission of at least one other user equipment of the first sidelink radio access technology resource pool is a cooperative awareness message.

8. The method of claim 1, wherein the exclusion is based on identification of an occurrence of at least one of: Whether the candidate resources overlap with resources of at least one of an upcoming physical sidelink control channel and a physical sidelink shared channel transmission indicated as reserved for the first sidelink radio access technology resource pool or the second sidelink radio access technology resource pool, or whether the associated at least one physical sidelink feedback channel resource overlaps with resources of at least one of an upcoming physical sidelink control channel and a physical sidelink shared channel transmission indicated as reserved for the first sidelink radio access technology resource pool.

9. The method of claim 5, wherein the resource time of the physical side link feedback channel resource indicated by the exclusion identifier does not overlap with the transmission of a collaborative sensing message, and the new radio reception is expected to use the first side link radio access technology resource pool receiving counterpart to receive the collaborative sensing message.

10. The method according to claim 1, wherein the at least one candidate resource set comprises a first group of resources capable of configuring hybrid automatic repeat request feedback, and a second group of resources capable of not configuring hybrid automatic repeat request feedback.

11. The method of claim 10, wherein the resources within the candidate resource set capable of configuring hybrid automatic repeat request feedback in at least one candidate resource set are evaluated based on the sensing that the first sidelink radio access technology resource pool has available associated resources for the physical sidelink shared channel.

12. The method of claim 10, wherein the resources within the candidate resource set in the at least one candidate resource set that cannot be configured with hybrid automatic repeat request feedback are evaluated based on the sensing that the first sidelink radio access technology resource pool does not have available associated resources for the physical sidelink shared channel.

13. The method according to claim 10, wherein when the transmitted payload requires hybrid automatic repeat request feedback, the resource is selected from the candidate resource set that can be configured with hybrid automatic repeat request feedback; otherwise, the resource is selected from the candidate resource set that cannot be configured with hybrid automatic repeat request.

14. The method of claim 1, wherein the first sidelink radio access technology resource pool and the second sidelink radio access technology resource pool overlap each other in at least one of time or frequency.

15. An apparatus comprising: at least one processor; as well as at least one non-transitory memory, the at least one non-transitory memory comprising computer program code, wherein the at least one non-transitory memory comprising the computer program code is configured to cause the apparatus to: performing, by the user equipment, sensing of reserved resources in both the first sidelink radio access technology resource pool and the second sidelink radio access technology resource pool; forming, based on the sensing, at least one candidate resource set identifying all resources to be free for use by the first radio access technology resource pool in accordance with an indication that resources are not being used for transmission by at least one other user equipment of the first sidelink radio access technology resource pool; as well as for each of the resources in the at least one candidate resource set, identifying a corresponding resource to be used for a physical sidelink feedback channel of the first sidelink radio access technology resource pool; excluding, from said at least one candidate resource set, all said resources of said physical sidelink feedback channel resources identified as being reserved for said transmission by said at least one other user equipment of said first sidelink radio access technology resource pool based on said sensing; as well as Resources to be used for the transmission of a physical sidelink control channel and a physical sidelink shared channel are selected from the at least one candidate resource set.

16. A method comprising: Selecting a resource for transmission from a set of candidate resources for which hybrid automatic repeat request feedback cannot be configured; sensing a first sidelink radio access technology resource pool and a second sidelink radio access technology resource pool until a time before the start of said transmission in said selected said resources; And at least one of the following: If the condition of the resource reselection trigger is not met during the sensing period, performing transmission of a physical sidelink control channel and a physical sidelink shared channel in the selected resource, or Resource reselection is performed based on a condition that the resource reselection trigger is satisfied during the sensing period.

17. The method of claim 16, wherein the condition of the resource reselection trigger is based on at least one of: The selected resources are identified as being reserved for the transmission of a physical sidelink control channel, or A physical sidelink shared channel of a first sidelink radio access technology resource pool.

18. An apparatus comprising: at least one processor; as well as at least one non-transitory memory, the at least one non-transitory memory comprising computer program code, wherein the at least one non-transitory memory comprising the computer program code is configured to cause the apparatus to: Selecting a resource for transmission from a set of candidate resources for which hybrid automatic repeat request feedback cannot be configured; sensing a first sidelink radio access technology resource pool and a second sidelink radio access technology resource pool until a time before the start of said transmission in said selected said resources; And at least one of the following: If the condition of the resource reselection trigger is not met during the sensing period, performing transmission of a physical sidelink control channel and a physical sidelink shared channel in the selected resource, or Resource reselection is performed based on a condition that the resource reselection trigger is satisfied during the sensing period.

19. A method comprising: Selecting a resource for transmission from a set of candidate resources capable of configuring hybrid automatic repeat request feedback; sensing said first sidelink radio access technology resource pool resource pool until a time before commencement of said transmission in said selected said resource; performing transmission of a physical sidelink control channel and a physical sidelink shared channel in the selected resource based on that a condition of a resource reselection trigger is not satisfied during the sensing period; as well as Resource reselection is performed based on a condition that the resource reselection trigger is satisfied during the sensing period.

20. The method of claim 19, wherein the condition of the resource reselection trigger is at least one of the following: the selected resources are identified as being reserved for the transmission of a physical sidelink control channel or a physical sidelink shared channel of a first sidelink radio access technology resource pool, The physical sidelink feedback channel resources associated with the selected resources are identified as reserved for the transmission of a physical sidelink control channel or a physical sidelink shared channel of the first sidelink radio access technology resource pool.

21. The method according to claim 19, wherein when it is determined that the condition of the resource reselection trigger is met for the situation where the physical sidelink feedback channel resource associated with the selected resource is identified as reserved for the transmission of the physical sidelink control channel or the physical sidelink shared channel of the first sidelink radio access technology resource pool, it is determined not to request hybrid automatic repeat request feedback and to continue the transmission on the resource initially selected.

22. An apparatus comprising: at least one processor; as well as at least one non-transitory memory, the at least one non-transitory memory comprising computer program code, wherein the at least one non-transitory memory comprising the computer program code is configured to cause the apparatus to: Selecting a resource for transmission from a set of candidate resources capable of configuring hybrid automatic repeat request feedback; sensing said first sidelink radio access technology resource pool resource pool until a time before commencement of said transmission in said selected said resource; performing transmission of a physical sidelink control channel and a physical sidelink shared channel in the selected resource based on that a condition of the resource reselection trigger is not satisfied during the sensing period; as well as Resource reselection is performed based on a condition that the resource reselection trigger is satisfied during the sensing period.

23. A method comprising: performing, by the network device, sensing of reserved resources in both the first sidelink radio access technology resource pool and the second sidelink radio access technology resource pool; identifying, from the second sidelink radio access technology resource pool, a sidelink timeslot configured with physical sidelink feedback channel resources in which at least one transmission from at least one other user equipment from the first sidelink radio access technology resource pool is expected; receiving a physical sidelink control channel and a physical sidelink shared channel transmission from a second sidelink radio access technology resource pool; as well as determining that the received transmission from the second sidelink radio access technology resource pool requests hybrid automatic repeat request feedback in the physical sidelink feedback channel resources mapped to the resources in which the transmission from the second sidelink radio access technology resource pool was received, Wherein, it is determined based on the identifier that the physical side link feedback channel resources of the second side link radio access technology resource pool are unavailable, and the hybrid automatic repeat request transmission mapped to the same physical side link feedback channel resources is skipped.

24. A method according to claim 23, wherein, at least in one of the first radio access technology resource pool or the second side link radio access technology resource pool, the sensing evaluation indicates whether the reservation of future resources is indicated in the received side link control information; and the effectiveness of the reservation is also evaluated based on the measurement of the reference signal received power associated with the received side link control information.

25. The method according to claim 23, wherein in the first side link radio access technology resource pool resource pool, the sensing evaluation of the physical side link feedback channel resources corresponding to the resources in at least one candidate resource set is: whether the reservation of the physical side link feedback channel resources is indicated in the received side link control information; and the effectiveness of the reservation is also evaluated based on the measurement of the reference signal received power associated with the received side link control information.

26. The method of claim 25, wherein based on determining that physical sidelink feedback channel resources of the second sidelink radio access technology resource pool are unavailable, based on an indication in the sidelink control information associated with the received physical sidelink control channel and physical sidelink shared channel transmissions from the second sidelink radio access technology resource pool, hybrid automatic repeat request transmissions mapped to the same physical sidelink feedback channel resources are skipped.

27. The method of claim 23, wherein the physical sidelink feedback channel resource is available and can be assumed based on at least one of the following: The measurement reference signal received power of the sidelink control information associated with the first sidelink radio access technology resource pool transmission is lower than a preconfigured threshold, The physical sidelink feedback channel does not overlap with the first sidelink radio access technology resource pool transmission physical sidelink control channel, or The physical sidelink feedback channel does not overlap with the first sidelink radio access technology resource pool transmission physical sidelink control channel, and the measurement reference signal reception power of the evolved sidelink control information associated with the first sidelink radio access technology resource pool transmission is lower than a preconfigured threshold.

28. An apparatus comprising: at least one processor; as well as at least one non-transitory memory, the at least one non-transitory memory comprising computer program code, wherein the at least one non-transitory memory comprising the computer program code is configured to cause the apparatus to: performing, by the network device, sensing of reserved resources in both the first sidelink radio access technology resource pool and the second sidelink radio access technology resource pool; identifying, from the second sidelink radio access technology resource pool, a sidelink timeslot configured with physical sidelink feedback channel resources in which at least one transmission from at least one other user equipment from the first sidelink radio access technology resource pool is expected; receiving a physical sidelink control channel and a physical sidelink shared channel transmission from a second sidelink radio access technology resource pool; as well as determining that the received transmission from the second sidelink radio access technology resource pool requests hybrid automatic repeat request feedback in the physical sidelink feedback channel resources mapped to the resources in which the transmission from the second sidelink radio access technology resource pool was received, Determining that a physical sidelink feedback channel resource of the second sidelink radio access technology resource pool is unavailable based on the identification, and skipping hybrid automatic repeat request transmissions mapped to the same physical sidelink feedback channel resource.

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