Optimized reporting of sidelink detection and resource reservation information

Abstract

A method and a user equipment for sharing radio resource information are provided. The method includes receiving first sidelink control information (SCI) in a first radio access technology (RAT) module, the first RAT module being configured to implement the first RAT. At least one first radio resource is determined based on the first SCI. First information associated with the first SCI is transmitted to a second RAT module, the second RAT module being configured to implement the second RAT, the second RAT being different from the first RAT. The second SCI is received in the first RAT module. At least one second radio resource is determined based on the second SCI. Whether to transmit the second information associated with the second SCI to the second RAT module is determined based at least on whether the determined at least one first radio resource matches the determined at least one second radio resource.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of priority to U.S. Provisional Patent Application No. 63 / 396,896, filed August 10, 2022, the entire contents of which are incorporated by reference herein.

[0002] The present disclosure relates generally to sharing of sidelink sensing information, and more particularly to sharing of sidelink sensing information between a first radio access technology (RAT) module and a second RAT module in a user equipment (UE). [Background technology]

[0003] Spectral efficiency is important for wireless communication systems. Typically, scarce spectrum resources are geographically reused among multiple users, and wireless communication systems are therefore limited by co-channel interference or contamination of information-bearing signals by other similar types of signals at the receiving antenna. An example of such a system is cellular communications, where efficient spectrum utilization typically requires complex resource allocation procedures based on radio measurements. Problems can arise when users are unable to perform radio measurements.

[0004] Sidelink communication is used in the 3GPP air interface to enable two (or more) user equipments (UEs) (e.g., wireless devices) to communicate directly with each other. This can occur under cellular network coverage, outside cellular network coverage, or under partial cellular network coverage where only one of the two UEs is under cellular network coverage. Sidelink communication facilitates efficient spectrum reuse, for example, in direct communication in automotive applications. Device-to-device direct communication uses the PC5 interface in an example of 3GPP sidelink.

[0005] When a first device in a first sidelink communication shares radio resources with a second device in a second sidelink communication, the first and second devices select radio resources for use. To select the radio resources, the first or second device acquires resource reservation information and / or channel sensing information. Sometimes, direct exchange of such information between the two devices is not possible. For example, a first device may be equipped with modules for both the first and second sidelink communications and capable of decoding resource information related to the second sidelink communication, while a second device may only have modules for the second sidelink communication and therefore not be capable of decoding resource information related to the first sidelink communication, resulting in inefficient and unfair resource allocation. Improved systems and methods for sharing resource reservation information and / or channel sensing information are desired.

[0006] The 3rd Generation Partnership Project (3GPP) Release 16 / 17 5G NR-V2X PC5 Mode 2 resource selection procedure is specified in 3GPP TS38.213, TS38.214, and TS38.321. For resource selection, a user equipment (UE) performs channel sensing within a sensing window and, based on sidelink control information (SCI) decoding, communicates with other UEs to identify candidate resources within a selection window T (T = [T1, T2]). First, the UE excludes some time slots from the selection window due to unmonitored resources within the detection window that the UE cannot detect by its own transmission (i.e., half-duplex constrained). Then, the UE calculates the corresponding sidelink-reference signal received power (SL-RSRP) and If the received power (SL-RSRP) exceeds a (pre-)configured SL-RSRP exclusion threshold, the UE further excludes resources reserved by other UEs from the selection window. After resource exclusion, the number of candidate resources may be at least X% of the total number of resources in the selection window. Otherwise, the UE increases the SL-RSRP exclusion threshold by (e.g.) 3 dB until it obtains at least X% of the resources, where X is (pre-)configured, e.g., 20%, 35%, or 50%. Finally, the UE randomly selects a resource among the candidate resources in the selection window. The selected frequency resource can be used for subsequent transmissions (e.g., semi-persistent scheduling (SPS)) multiple times at fixed time intervals or only once (e.g., one-shot transmission (OST)). The UE can also retransmit packets multiple times with or without feedback from the receiving UE to improve reliability (e.g., hybrid automatic repeat request (HARQ) retransmission).

[0007] To obtain information for the UE to perform detection and receive packets from other UEs, the UE first decodes the SCI. In Rel-16, as defined in 3GPP TS38.212, there are the first-stage SCI (SCI format 1-A) and the second-stage SCI (SCI format 2-A or 2-B). The first-stage SCI carries resource reservation information for future transmissions, as well as information about resource allocation and modulation and coding scheme (MCS) for the physical sidelink shared channel (PSSCH), demodulation reference signal (DMRS) pattern, and second-stage SCI format. The second-stage SCI carries control information for HARQ procedures, source / destination IDs, distance-based groupcast (UE zone identification (ID) and communication range requirements), and so on. Based on the resource reservations included in the first-stage SCI, each UE avoids using time / frequency resources reserved by other UEs when performing resource (re)selection.

[0008] Rel-17 5G NR-V2X PC5 Mode 2 introduces inter-UE coordination (IUC), in which UE-A sends coordination information about resources to UE-B, which then uses this information for its resource (re)selection. Two schemes of inter-UE coordination are supported:

[0009] In IUC scheme 1, a UE-A can provide another UE-B with an indication of resources that should preferably be included or excluded in the UE-B's (re)selected resources. When including a given resource, the UE-B can rely on these resources alone, at least if it does not support sensing / resource exclusion, or it can combine these resources with resources identified by its own sensing procedure before making the final selection. The indication from UE-A to UE-B is sent in the medium access control (MAC) control element (CE) and / or the second stage SCI.

[0010] In IUC Scheme 2, UE-A is a) An indication can be provided to another UE-B that resources reserved for UE-B's transmission are or will be subject to conflict with a transmission from another UE. UE-B then reselects new resources to replace them. The indication from UE-A to UE-B can be sent on the physical sidelink feedback channel (PSFCH). Summary of the Invention [Problem to be solved by the invention]

[0011] In some situations, an internal vehicle interface (e.g., a communication bus when a UE is implemented in a vehicle) connecting two radio access technology (RAT) modules (e.g., an LTE vehicle-to-everything (V2X) module and a 5G next radio (NR) V2X module) may have limited remaining capacity, for example, during use by other bandwidth-intensive applications (such as camera or radar applications). Furthermore, conflicts may occur between protocol data unit (PDU) transmissions on the shared medium, leading to increased latency (e.g., due to retransmissions) and performance degradation for all interface users (including legacy applications). Therefore, it is desirable to minimize the bandwidth requirements for sharing sensing and resource reservation information between the two RAT modules. [Means for solving the problem]

[0012] In some embodiments, a method for sharing radio resource information is provided. The method includes receiving first sidelink control information (SCI) at a first radio access technology (RAT) module, the first RAT module being configured to implement the first RAT. At least one first radio resource is determined based on the first SCI. First information associated with the first SCI is transmitted to a second RAT module, the second RAT module being configured to implement the second RAT, the second RAT being different from the first RAT. The second SCI is received at the first RAT module. At least one second radio resource is determined based on the second SCI. Whether to transmit the second information associated with the second SCI to the second RAT module is determined based at least on whether the determined at least one first radio resource matches the determined at least one second radio resource.

[0013] In some embodiments, a user equipment (UE) for sharing radio resource information is provided, the UE including a memory configured to store instructions and a processor configured to execute the instructions stored in the memory. The processor is configured to: receive first sidelink control information (SCI) at a first radio access technology (RAT) module in the UE, the first RAT module being configured to implement a first RAT; determine at least one first radio resource based on the first SCI; transmit first information associated with the first SCI to a second RAT module, the second RAT module being configured to implement a second RAT, the second RAT being different from the first RAT; receive the second SCI at the first RAT module; determine the at least one second radio resource based on the second SCI; and determine whether to transmit the second information associated with the second SCI to the second RAT module based on at least whether the determined at least one first radio resource matches the determined at least one second radio resource.

[0014] In some embodiments, a non-transitory computer-readable medium storing instructions executable by one or more processors of user equipment (UE) in a communications network for performing the method. A computer-readable medium is provided. The method includes receiving first sidelink control information (SCI) at a first radio access technology (RAT) module, the first RAT module being configured to implement the first RAT. At least one first radio resource is determined based on the first SCI. First information associated with the first SCI is transmitted to a second RAT module, the second RAT module being configured to implement the second RAT, the second RAT being different from the first RAT. The second SCI is received at the first RAT module. At least one second radio resource is determined based on the second SCI. Whether to transmit the second information associated with the second SCI to the second RAT module is determined based at least on whether the determined at least one first radio resource matches the determined at least one second radio resource.

[0015] These and other aspects and implementations thereof are described in more detail in the drawings, description, and claims. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic diagram illustrating device types for dynamic co-channel coexistence of first and second sidelink communications, consistent with some embodiments of the present disclosure. [Figure 2] 1 is a block diagram of a UE consistent with some embodiments of the present disclosure. [Figure 3] FIG. 1 is an example diagram of an LTE physical sidelink control channel (PSCCH) / physical sidelink shared channel (PSSCH) transmission detected by a first RAT module, consistent with some embodiments of the present disclosure. [Figure 4] FIG. 10 is an example diagram of sidelink sensing information sharing between a first RAT module and a second RAT module, consistent with some embodiments of the present disclosure. [Figure 5]1 is a flowchart of a method for sidelink sensing information sharing, consistent with some embodiments of the present disclosure. [Figure 6] 10 is a flowchart of another method for sidelink sensing information sharing, consistent with some embodiments of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0017] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the drawings. The following description refers to the accompanying drawings, in which like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following description of exemplary embodiments do not represent all implementations consistent with this disclosure. Instead, the implementations are merely examples of apparatuses, systems, and methods consistent with aspects related to the subject matter that may be recited in the appended claims.

[0018] Generally, one or more aspects of the present disclosure are directed to sidelink sensing information sharing. Some embodiments of the present disclosure may be specifically applied to related 3GPP sidelink solutions, such as 3GPP 5G NR-V2X PC5 Mode 2 resource selection or 3GPP LTE-V2X PC5 Mode 4 resource selection.

[0019] The Physical Sidelink Shared Channel (PSSCH) carries sidelink data in both the Long Term Evolution (LTE) sidelink and the New Radio (NR) (5G New Radio) sidelink. In the LTE and NR sidelink, sensing involves collecting resource reservation information from other UEs and measuring the Sidelink Reference Signal Received Power (SL-RSRP) and Sidelink Received Signal Strength Indicator (SL-RSSI) so that the transmitting UE can determine the available radio resources within a selection window. This is carried out to carry out the following.

[0020] It is proposed to expand the applicability of the NR sidelink to consider vehicle-to-everything (V2X) deployment scenarios, where LTE V2X and NR V2X devices coexist on the same or partially overlapping radio spectrum resources. For this coexistence, several mechanisms may be created to utilize the resource allocations of these two technologies in an efficient manner without negatively impacting the operation of each technology.

[0021] Device Types A, B, and C FIG. 1 is a schematic diagram illustrating device types for dynamic co-channel coexistence of first and second sidelink (SL) communications, consistent with some embodiments of the present disclosure. With reference to FIG. 1 , at least three types of devices (Type A, Type B, and Type C) are considered in this disclosure. A Type A device includes a module for the first SL communication and a module for the second SL communication. A Type B device includes only a module for the first SL communication. A Type C device includes only a module for the second SL communication. For example, in one embodiment, a Type A device includes both LTE SL and NR SL modules, a Type B device includes only an NR SL module, and a Type C device includes only an LTE SL module.

[0022] User Equipment (UE) FIG. 2 is a block diagram of a UE 200 consistent with some embodiments of the present disclosure. The UE 200 may be a Type A, Type B, Type C, or any other type of UE. The UE 200 may be mounted on a moving vehicle or at a fixed location (e.g., as a roadside unit (RSU)), or may be carried by a person. The UE 200 may have any form, including, but not limited to, a vehicle, a vehicle-mounted component, a laptop computer, a wireless terminal including a mobile phone, a wireless handheld device, a wireless personal device, or any other form. Referring to FIG. 2 , the UE 200 may include an antenna 202 that may be used for transmitting electromagnetic signals to a base station or other UEs and / or receiving electromagnetic signals from a base station or other UEs. The antenna 202 may include one or more antenna elements and may enable different input-output antenna configurations, such as a multiple-input multiple-output (MIMO) configuration, a multiple-input single-output (MISO) configuration, and a single-input multiple-output (SIMO) configuration. In some embodiments, antenna 202 may include a large number (e.g., tens or hundreds) of antenna elements and may enable multi-antenna functionality such as beamforming. In some embodiments, antenna 202 is a single antenna.

[0023] The UE 200 may include a transceiver 204 coupled to the antenna 202. The transceiver 204 may be a wireless transceiver and may communicate bidirectionally with a base station or another UE. For example, the transceiver 204 may receive wireless signals from a base station via downlink communication and transmit wireless signals to a base station via uplink communication. The transceiver 204 may also receive wireless signals from and transmit wireless signals to another UE or a roadside unit (RSU) via sidelink communication. The transceiver 204 may include a modem for modulating packets and providing the modulated packets to the antenna 202 for transmission, and for demodulating packets received from the antenna 202.

[0024] The UE 200 may include a memory 206. The memory 206 may be any computer-readable storage medium, including volatile or non-volatile memory devices, or a combination thereof. The computer-readable storage medium may be of any type. Computer-readable storage media include, but are not limited to, non-transitory computer storage media. Non-transitory storage media can be accessed by general-purpose or special-purpose computers. Examples of non-transitory storage media include, but are not limited to, portable computer diskettes, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), electrically erasable programmable ROM (EEPROM), digital versatile disks (DVDs), flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, etc. Non-transitory media may be used to carry or store desired program code means (e.g., instructions and / or data structures) and can be accessed by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. In some examples, the software / program code may be transmitted from a remote source (e.g., a website, a server, etc.) using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave. In such examples, coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are within the definition of media. Combinations of the above examples are also within the scope of computer-readable media.

[0025] The memory 206 may store information regarding the identity of the UE 200, as well as signals and / or data received by the antenna 202. The memory 206 may also store processed signals and / or data. The memory 206 may also store computer-readable program instructions, mathematical models, and algorithms used in signal processing in the transceiver 204 and calculations in the processor 208. The memory 206 may further store computer-readable program instructions for execution by the processor 208 to operate the UE 200 to perform various functions described elsewhere in this disclosure. In some examples, the memory 206 may include a basic input / output system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0026] The computer-readable program instructions of the present disclosure may be assembler instructions, instruction set architecture (ISA) instructions, machine language instructions, machine-dependent instructions, microcode, firmware instructions, state-setting data, or source or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​and conventional procedural programming languages. The computer-readable program instructions may execute entirely on a computing device as a standalone software package, or partially on a first computing device and partially on a second computing device remote from the first computing device. In the latter scenario, the second, remote computing device may be connected to the first computing device through any type of network, including a local area network (LAN) or a wide area network (WAN).

[0027] The UE 200 may include a processor 208, which may include a hardware device having processing capabilities. The processor 208 may include at least one of a general-purpose processor, a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), a microcontroller, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or another programmable logic device. Examples of a processor include, but are not limited to, a microprocessor, any conventional processor, controller, microcontroller, or state machine. In some embodiments, the processor 208 may be implemented using a combination of devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration). The processor 208 may receive downlink or sidelink signals from the transceiver 204 and further process the signals. The processor 208 may also receive data packets from the transceiver 204 and further process the packets. In some embodiments, the processor 208 may be configured to operate a memory using a memory controller. In some embodiments, the memory controller may be integrated into the processor 208. The processor 208 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 206) to cause the UE 200 to perform various functions.

[0028] The UE 200 is a global positioning system (GPS). The UE 200 may include a GPS 210. The GPS 210 may be used to enable location-based services or other services based on the geographic location of the UE 200 and / or for synchronization between UEs. The GPS 210 may receive Global Navigation Satellite System (GNSS) signals from a single satellite or multiple satellite signals via the antenna 202 and provide the geographic location of the UE 200 (e.g., the coordinates of the UE 200).

[0029] The UE 200 may include input / output (I / O) devices 212 that may be used to communicate the results of signal processing and calculations to a user or another device. The I / O devices 212 may include a user interface including a display and an input device for sending user commands to the processor 208. The display may be configured to display the status of signal reception at the UE 200, data stored in the memory 206, the status of signal processing, and the results of calculations. The display may include, but is not limited to, a cathode ray tube (CRT), a liquid crystal display (LCD), a light-emitting diode (LED), a gas plasma display, a touchscreen, or other image projection devices for displaying information to a user. The input devices may be any type of computer hardware equipment used to receive data and control signals from a user. The input devices may include, but are not limited to, a keyboard, a mouse, a scanner, a digital camera, a joystick, a trackball, cursor direction keys, a touchscreen monitor, or an audio / video commander.

[0030] The UE 200 may further include a mechanical interface 214 , such as an electrical or communication bus, that connects the transceiver 204 , the memory 206 , the processor 208 , the GPS 210 , and the I / O device 212 .

[0031] In some embodiments, the UE 200 may be configured or programmed for sidelink communications. The processor 208 may be configured to execute instructions stored in the memory 206 to implement a method for sidelink sensing information sharing, such as the method 500 described in connection with FIG. 5.

[0032] In one embodiment where UE 200 is a Type-A UE, UE 200 may include a first radio access technology (RAT1) module 220 in communication with bus 214 and a second radio access technology (RAT2) module 222 in communication with bus 214. In some embodiments, RAT1 module 220 may be configured to support a first RAT, such as LTE SL. In some embodiments, the RAT2 module 222 may be configured to implement a second RAT, such as NR SL, that is different from the first RAT. It is noted that the type of RAT implemented by the RAT modules 220, 222 is not limited to LTE SL and NR SL. The RAT modules 220, 222 can implement any type of RAT that does not change the operating principles of the embodiments described herein.

[0033] In one embodiment where the UE 200 is a Type-B UE or a Type-C UE, the UE 200 may include only one RAT module (e.g., RAT1 module 220). The RAT1 module 220 may implement any type of RAT, such as LTE SL, NR SL, or another type of RAT. In Figure 2, the RAT2 module 222 is shown with a dashed outline to indicate that it may not be included in some embodiments.

[0034] Detection and resource reservation information reporting Some embodiments of the present disclosure involve a method for reducing data rate requirements for sharing sensing and resource reservation information from a first radio access technology (RAT) module (e.g., an LTE V2X module) to a second RAT module (e.g., an NR V2X module). Some embodiments of the present disclosure describe the first RAT module as an LTE module and the second RAT module as an NR module. It is noted that the embodiments described herein function in a similar manner with different types of RAT modules, i.e., RATs different from LTE and / or NR. For purposes of discussion, the term “first RAT module” can refer to an LTE V2X module, and the term “second RAT module” can refer to an NR V2X module. As mentioned, the RAT associated with a particular RAT module may vary and is not limited to LTE and NR.

[0035] Some current implementations assumed continuous reporting of LTE detection information. After each subframe n, the first RAT module shared with the second RAT module the detection and resource reservation information for the LTE SCI decoded in subframe n (if any). This approach had the benefit of ensuring that the information arrived at the second RAT module as quickly as possible. Therefore, the second RAT module had the most recent information from the first RAT module when it performed resource exclusion for NR sidelink transmissions.

[0036] For sidelink, there may be no network control of radio resources, and therefore resource allocation may be performed autonomously at each UE. Resource allocation is based on sensing the transmission medium based on a resource exclusion threshold (e.g., RSRP and RSSI) within a sensing window. If resource exclusion reveals that there are no available resources for the UE to transmit, the UE adjusts the resource exclusion threshold and performs resource exclusion again to find available resources. Some UEs (e.g., the Type-A UE described in connection with FIG. 1) may include two different RAT modules. Different RATs have different frame structures and waveforms, and each RAT would perform its own sensing and resource exclusion to determine available radio resources for transmission. In vehicle-based implementations, because vehicles are designed to be used for at least 10 to 15 years and because RATs are constantly evolving, there may be multiple RATs (e.g., separate RAT modules for each RAT). By sharing resource information between different RAT modules, bandwidth usage on the internal vehicle communication bus may be reduced.

[0037] In some embodiments, the UE is implemented in a vehicle, and sensing and resource reservation information can be communicated over a vehicle internal interface (e.g., an internal communication bus, such as bus 214) for co-channel coexistence of LTE V2X and NR V2X. For each sidelink control information (SCI) decoded in a given subframe, the first RAT module determines whether the decoded SCI matches periodic resource reservation information already shared with the second RAT module. If there is a match, the first RAT module can refrain from sharing redundant sensing and / or resource reservation information with the second RAT module. Not sharing redundant information can reduce the data rate requirements for such information sharing and minimize the impact on / from legacy applications that simultaneously use the vehicle internal interface.

[0038] FIG. 3 illustrates an example of an LTE Physical Sidelink Control Channel (PSCCH) / Physical Sidelink Shared Channel (PSSCH) transmission detected by a first RAT module, consistent with some embodiments of the present disclosure. One characteristic of such transmissions is that they are often periodic (or semi-persistent) because they are typically used for transmitting periodic safety-related messages, such as cooperation awareness messages (CAMs) and basic safety messages (BSMs). For example, as shown in FIG. 3, an LTE PSCCH / PSSCH transmission detected in subframe 0 recurs periodically every 10 subframes (indicated by SCIO, SCIO, SCIO, SCIO, etc.). Therefore, it would be redundant for the first RAT module to report SCI and PSSCH reference signal received power (PSSCH-RSRP) information for every instance of a periodic LTE PSCCH / PSSCH transmission.

[0039] In some embodiments, for each SCI decoded in a given subframe n, the first RAT module determines whether the resources indicated by the decoded SCI match the periodic resource reservations previously reported to the second RAT module. If no match is found, the first RAT module reports the associated SCI and PSSCH-RSRP information to the second RAT module. Nevertheless, if a match is found, the first RAT module may refrain from reporting the associated SCI and / or PSSCH-RSRP information to reduce the load on the vehicle internal interface.

[0040] For example, referring to FIG. 3, immediately after subframe 0, the first RAT module may report SCI0 and the corresponding PSSCH-RSRP to the second RAT module. The reported SCI0 may be reported within a resource reservation interval (P rsvp,TX ) Later, in subframe 10, the first RAT module 10and determine a match with the previously reported periodic resource reservation associated with SCI 0. Additionally, the PSSCH-RSRP measured in subframe 10 may be similar to that measured in subframe 0, for example, if the vehicles transmitting these SCIs are the same and have not moved significantly relative to the detecting vehicle. Thus, the first RAT module may determine whether the PSSCH-RSRP measured in subframe 10 matches the PSSCH-RSRP measured in subframe 0, for example, if the vehicles transmitting these SCIs are the same and have not moved significantly relative to the detecting vehicle. 10 The same applies to when the first RAT module is configured to report any information related to the SCI to the second RAT module. 20 It may be applied later in subframe 20 when decoding .

[0041] In this way, the amount of LTE detection and resource reservation information transmitted over the vehicle internal interface may be reduced, as illustrated in Figure 4, with only SCI0, SCI2, etc. (and the corresponding PSSCH-RSRP) being shared over the bus via their respective PDUs. 10 , SCI 20 It is pointed out that information such as the following is not reported:

[0042] For example, due to non-zero relative speeds between vehicles, the measured PSSCH-RSRP may vary across different instances of the same periodic (or semi-persistent) LTE PSCCH / PSSCH transmission. For example, if a vehicle transmitting SCI0 is approaching a vehicle that detects it, SCI 10 The PSSCH-RSRP associated with SCI is higher than that measured for SCI0, and 20 On the other hand, if the vehicle that transmitted SCI0 is moving away, the PSSCH-RSRP associated with SCI1 is likely to become even higher. 10 There is a high possibility that the PSSCH-RSRP associated with

[0043] According to one embodiment, the first RAT module may monitor changes in the PSSCH-RSRP across instances of periodic transmission and update the second RAT module whenever the PSSCH-RSRP changes significantly (e.g., becomes greater than a PSSCH-RSRP change threshold Δ) compared to the last reported PSSCH-RSRP. 50 The first RAT module may decode the PSSCH-RSRP reported for SCI0 (not shown in FIG. 3 ) and determine that it conforms to the periodic resource reservation indicated by SCI0, but that the PSSCH-RSRP has increased (or decreased) by, for example, more than Δ=1 dB compared to the PSSCH-RSRP reported for SCI0 (which was the last reported PSSCH-RSRP for this periodic transmission). The first RAT module may then report the updated PSSCH-RSRP, or the determined increase (or decrease), to the second RAT module. In this way, the load on the transmit bus is minimized while the second RAT module obtains accurate PSSCH-RSRP information.

[0044] According to one embodiment, the PSSCH-RSRP change threshold Δ is set such that the observed change is an increase in PSSCH-RSRP (Δ + ) or decrease (Δ - For example, the PSSCH-RSRP increase threshold Δ + is the PSSCH-RSRP decrease threshold Δ - (For example, Δ - =3 dB) (e.g., Δ += 1 dB). This is driven by the different impacts of using an outdated PSSCH-RSRP value that is lower or higher than the latest PSSCH-RSRP value measured by the first RAT module. If an outdated PSSCH-RSRP value lower than the latest measurement is used by the second RAT module, candidate resources that might otherwise have been excluded for NR sidelink transmissions are not excluded, thus degrading coexistence performance. On the other hand, if an outdated PSSCH-RSRP value higher than the latest measurement is used by the second RAT module, candidate resources that might otherwise have been excluded for NR sidelink transmissions may be excluded (i.e., the second RAT module may be more conservative by excluding candidate resources excessively).

[0045] According to one embodiment, the PSSCH-RSRP change / increase / decrease thresholds (Δ, Δ + , Δ - ) may depend on the channel congestion level (e.g., channel busy ratio (CBR)) measured by the first RAT module and / or the second RAT module. For example, if the channel is very congested (e.g., high CBR), excessive exclusion of resources caused by stale PSSCH-RSRP values ​​higher than the most recent measurement (as described above) may cause the second RAT module to increase the RSRP threshold used for resource exclusion in order to provide the medium access control (MAC) layer with a minimum proportion of remaining candidate resources from which to randomly select. Thus, when the channel is congested, using a stale PSSCH-RSRP value higher than the most recent measurement may be problematic, as may using a lower stale PSSCH-RSRP value. To address this issue, a PSSCH-RSRP decrease threshold (Δ - ) can become smaller when channel congestion increases (e.g., For example, Δ - = 1 dB). According to one embodiment, the PSSCH-RSRP change / increase / decrease thresholds (Δ, Δ+ , Δ - ) may be adapted based on congestion or load on the vehicle internal interface. For example, if the interface is relatively idle, a smaller threshold (Δ, Δ) may be used. + , Δ - ) may be used (e.g., Δ=0.5 dB). On the other hand, if the interface is very congested (e.g., due to the interface being used simultaneously by other bandwidth-intensive vehicular applications), a larger threshold (Δ, Δ + , Δ - ) may be used (e.g., Δ=3 dB).

[0046] According to one embodiment, the first RAT module can detect the end of a periodic resource reservation (e.g., as a result of resource reselection being triggered in the transmitting vehicle) by decoding an SCI that indicates a resource reservation interval of zero. For example, in subframe 90, the first RAT module may detect the end of a periodic resource reservation (e.g., as a result of resource reselection being triggered in the transmitting vehicle) by decoding an SCI that indicates a resource reservation interval of zero. 90 Decode and SCI 90 matches the periodic resource reservation indicated by SCIO, but the indicated resource reservation interval is zero. This may then be interpreted by the detecting vehicle as an indication that the periodic resource reservation associated with SCIO is no longer valid (i.e., the respective future periodic resource is no longer reserved), and the second RAT module may be notified accordingly.

[0047] According to one embodiment, the first RAT module may successively detect the absence of one or more expected periodic SCIs and notify the second RAT module that the corresponding periodic resource reservations are no longer detectable. This may occur as a result of the transmitting vehicle becoming increasingly farther away from the detecting vehicle, resulting in the detecting vehicle no longer being able to decode the transmitted SCI. To avoid one-off or temporary SCI decoding failures (e.g., due to a short-term outage caused by a nearby vehicle), the first RAT module may notify the second RAT module of such an event only after a minimum number of expected (periodic) SCIs have not been detected. The previous gradual decrease in the measured PSSCH-RSRP may be used as a further indication that the transmitting vehicle has likely moved beyond the SCI detection range of the detecting vehicle.

[0048] According to one embodiment, if a first RAT module consecutively detects the absence of one or more expected periodic SCIs with a resource reservation interval of 100 milliseconds (ms) or more and notifies this event to a second RAT module, the second RAT module may determine that the corresponding periodic resource reservation is no longer valid (i.e., the respective future periodic resources are no longer reserved) because the resource reservation chain is broken due to the absence of one or more expected periodic SCIs in the first RAT module. This is because in LTE V2X, one SCI can reserve resources for the next transport block (TB), but cannot reserve resources for TBs following the next TB if the resource reservation interval is 100 ms or more.

[0049] According to one embodiment, the second RAT module can implicitly infer the end of the periodic resource reservation by using a timer. Upon receiving an SCI report from the first RAT module indicating the periodic resource reservation, the second RAT module can start a timer associated with the periodic resource reservation. The timer may be restarted each time the first RAT module reports some information about the periodic resource reservation to the second RAT module. If the timer expires, the second RAT module considers the periodic resource reservation to be no longer valid.

[0050] In some embodiments, a RAT module in a UE (e.g., the RAT1 module 220 shown in FIG. 2) can request sensing information from another RAT module (e.g., the RAT2 module 222) or from another UE (e.g., from a RAT in another UE). The sensing information request can include location information for the requesting UE. For example, the location information can be vague (e.g., a general location of the requesting UE), based on the shape of a cell of the RAT, or include specific information (e.g., GPS location coordinates). In some embodiments, the more precise the location information in the sensing information request, the more accurate the response can be (e.g., more precise sensing information relative to the requesting UE's current location).

[0051] In some embodiments, a sensing information request sent by a requesting UE may be received by multiple receiving UEs. In such a situation, the requesting UE may receive responses from all receiving UEs and combine this information. For example, the requesting UE may combine the sensing information based on weighted majority voting or majority averaging.

[0052] 5 is a flowchart of a method 500 for sharing sidelink sensing information between a first RAT module and a second RAT module, consistent with some embodiments of the present disclosure. In the first RAT module, a determination is made as to whether any sidelink control information (SCI) has been decoded in the current subframe (e.g., subframe number n) (step 502). If no SCI has been decoded in the current subframe (step 502, "NO" branch), method 500 waits for the next subframe, increments n (step 504), and continues with step 502 as described above.

[0053] If at least one SCI is decoded in the current subframe (step 502, "yes" branch), method 500 proceeds for each SCI decoded in the current subframe (step 506) and repeats further steps as shown in Figure 5. The first RAT module examines the SCI to determine whether it indicates that the resource reservation interval is zero, indicating that resource reselection has been triggered in the current subframe (step 508). If the resource reservation interval is zero (step 508, "yes" branch), the first RAT module notifies the second RAT module that periodic resource reservation is no longer in effect (step 510), and method 500 waits for the next subframe, increments n (step 504), and continues with step 502 as described above.

[0054] If the resource reservation interval is not zero (step 508, "no" branch), a determination is made as to whether the SCI indicates whether resources that meet the periodic resource reservation have already been reported to the second RAT module (step 512). If resources that meet the periodic resource reservation have not yet been reported to the second RAT module (step 512, "no" branch), the first RAT module reports the periodic resource reservation information and the PSSCH-RSRP associated with the SCI to the second RAT module (step 514). Method 500 waits for the next subframe, increments n (step 504), and continues with step 502 as described above.

[0055] If resources that meet the periodic resource reservation have already been reported to the second RAT module (step 512, "yes" branch), the second RAT module checks whether the change in PSSCH-RSRP is greater than a predetermined threshold (e.g., Δ, Δ + , or Δ - If the change in PSSCH-RSRP is greater than a predetermined threshold (step 516), a determination is made as to whether the PSSCH-RSRP 16, "Yes" branch), the first RAT module reports the current PSSCH-RSRP, or the change (i.e., Δ), to the second RAT module (step 518). Method 500 waits for the next subframe, increments n (step 504), and continues with step 502 as described above.

[0056] If the change in PSSCH-RSRP is less than or equal to a predetermined threshold (step 516, "no" branch), no information is reported to the second RAT module. A determination is made as to whether there are any more SCIs in the current subframe (step 520). If there are any more SCIs in the current subframe (step 520, "yes" branch), the next SCI in the subframe is analyzed as described in connection with steps 508-518. If there are no more SCIs in the current subframe (step 520, "no" branch), method 500 waits for the next subframe, increments n (step 504), and continues with step 502 as described above.

[0057] The information (detection and / or resource reservation) reported from the first RAT module to the second RAT module may include any time-domain and / or frequency-domain information (e.g., slot, subframe, frame, subchannel, carrier, resource pool, etc.) The information may include one or more of the already standardized SCI Format 1 fields defined in 3GPP Technical Specification 36.212 for LTE V2X: priority, resource reservation, frequency resource location of initial transmission and retransmission, time gap between initial transmission and retransmission, modulation and coding scheme, retransmission index, and / or transmission format.

[0058] 6 is a flowchart of a method 600 for sidelink sensing information sharing consistent with some embodiments of the present disclosure. First sidelink control information (SCI) is received at a first radio access technology (RAT) module of a UE (step 602). The first SCI may include radio resource reservation information, as described elsewhere in this disclosure. The first RAT module may be configured to implement the first RAT, as described elsewhere in this disclosure.

[0059] At least one first radio resource is determined based on the first SCI (step 604). The first radio resource may be a radio resource used by the UE to transmit. First information associated with the first SCI is transmitted to a second RAT module (step 606). The second RAT module may be configured to implement a second RAT different from the first RAT, as described elsewhere in this disclosure. For example, the first information may include a first received signal measurement associated with the first SCI (e.g., a received signal strength associated with the first SCI) or a first physical sidelink reference signal received power associated with the first SCI.

[0060] A second SCI is received in the first RAT module (step 608). The second SCI may include radio resource reservation information, as described elsewhere in this disclosure. At least one second radio resource is determined based on the second SCI (step 610). A decision is made as to whether to transmit second information associated with the second SCI to the second RAT module (step 612). The decision may be based at least on whether the determined at least one first radio resource matches the determined at least one second radio resource. In some embodiments, determining whether to transmit the second information may be further based on at least a second received signal measurement associated with the second SCI. The second received signal measurement may include a received signal strength measurement, a second physical sidelink reference signal measurement associated with the second SCI, or a received signal power measurement. For example, the first received signal measurement At least one of the value or the second received signal measurement may be a received signal strength measurement.

[0061] In some embodiments, determining the at least one first radio resource may be based on a first resource reservation interval indicated by the first SCI, and the determined at least one first radio resource may occur an integer multiple of the first resource reservation interval after the subframe in which the first SCI is received.

[0062] In some embodiments, the method may further include determining a difference between the first received signal measurement and the second received signal measurement, and transmitting second information to the second RAT module based on the determined difference being greater than a threshold. The second information may include the difference. In some embodiments, the threshold may depend on a sign of the difference, a channel busy ratio determined by the first RAT module or the second RAT module, or an observed congestion level or load of a communication interface between the first RAT module and the second RAT module.

[0063] In some embodiments, the first information may include a radio resource reservation index identifying a periodic radio resource reservation associated with the first SCI. The second information may include a radio resource reservation index identifying a periodic radio resource reservation associated with the first SCI.

[0064] In some embodiments, the method may further include transmitting, based on the determination of whether to transmit the second information, second information associated with the second SCI to the second RAT module.

[0065] In some embodiments, the method may further include incrementing, by the first RAT module, a radio resource reservation index counter each time information is transmitted or received without the radio resource reservation index.

[0066] In some embodiments, the method may further include incrementing a radio resource reservation index counter by the second RAT module each time information is sent or received without the radio resource reservation index.

[0067] In some embodiments, the method may further include transmitting third information from the first RAT module to the second RAT module, the third information indicating an end of a periodic radio resource reservation associated with the first SCI. The third information may be based on at least one of a second radio resource reservation interval indicated by the second SCI being zero or the first RAT module failing to receive a configured number of expected SCIs consecutively.

[0068] In some embodiments, the method may further include determining, by the second RAT module and based on the third information, that the periodic radio resource reservation associated with the first SCI is no longer valid. In some embodiments, the method may further include determining, by the second RAT module, an end of the periodic radio resource reservation associated with the first SCI based on the expiration of a timer.

[0069] Resource Reservation Index In some embodiments, a resource reservation index or resource reservation identifier (ID) may be reported by the first RAT module along with the resource reservation information, which indicates that the reported resource reservation information is associated with the reported resource reservation index. For subsequent reports from the first RAT module to the second RAT module (e.g., used to indicate a change in PSSCH-RSRP relative to a previously reported PSSCH-RSRP), only the resource reservation index may need to be reported.

[0070] The resource reservation index may be an optional parameter or field. The first RAT module may explicitly indicate whether the "resource reservation index" parameter or field was reported. In some embodiments, a resource reservation associated with a resource reservation index may be overwritten by reporting a different resource reservation having a resource reservation index that corresponds to a previously used resource reservation index.

[0071] In some embodiments, when information (detection and / or resource reservation) is reported from a first RAT module to a second RAT module, a resource reservation index is not transmitted, but instead may be produced in both the first RAT module and the second RAT module by incrementing a resource reservation index counter. The counter may be incremented each time a resource reservation is reported without a resource reservation index.

[0072] The association between a resource reservation and a resource reservation index may be cleared after a specific time and / or after a specific resource reservation index is reached and / or by using an explicit indication from the first RAT module to the second RAT module. In some embodiments, the resource reservation index may take the value "0" when a new association is created and / or when the maximum resource reservation index is reached or exceeded. Other starting values ​​are possible (e.g., "1").

[0073] Although examples in this disclosure refer to a first RAT module providing information to a second RAT module, embodiments herein may be used in the reverse direction (the second RAT module providing information to the first RAT module). Although some embodiments described in this disclosure use LTE and NR as example radio access technologies (RATs), the embodiments described herein may also be applicable to other RATs (e.g., 6G).

[0074] Any of the embodiments described herein may be used simultaneously or in combination. A combination of various embodiments may be controlled by one or more parameters in the same embodiment described herein relating to providing one or more parameters to a UE. In another embodiment, any of the embodiments described herein may be conditionally applied to a UE in a sidelink coexistence configuration.

[0075] Any of the embodiments described herein may be conditionally applied to UEs operating on the same resource pool or carrier frequency as the one detected.

[0076] Any of the embodiments described in this disclosure may be applied to 3GPP sidelink, for example, Release 18 NR sidelink and / or Release 18 LTE-NR sidelink coexistence (e.g., for sidelink during unlicensed access). Nevertheless, the embodiments described in this disclosure are not limited to this technology and may be applied to other wireless communication technologies, for example, but not limited to, Digital Enhanced Cordless Telecommunications / Digital European Cordless Telecommunications (DECT) or IEEE 802.11, such as Wi-Fi.

[0077] As used in this disclosure, the use of the term "or" in a list of items indicates an inclusive list. A list of items may be prefaced with a phrase such as "at least one of" or "one or more of." For example, a list of at least one of A, B, or C includes A or B or C or AB (i.e., A and B), or AC or BC or ABC (i.e., A and B and C). Also, as used in this disclosure, prefaced a list of conditions with the phrase "based on" should not be construed as "based only on" the set of conditions, but rather as "based at least in part on" the set of conditions. For example, a conclusion stated as "based on condition A" could be based on both condition A and condition B without departing from the scope of this disclosure.

[0078] As used herein, the terms "comprise," "include," or "contain" are used interchangeably, can have the same meaning, and are to be interpreted in an inclusive and broad manner. The terms "comprise," "include," or "contain" can be used before a list of elements to indicate that at least all of the listed elements in the list are present, but that other elements not in the list may also be present. For example, if A comprises B and C, then both {B,C} and {B,C,D} are within the scope of A.

[0079] The present disclosure, along with the accompanying drawings, describes illustrative configurations that are not representative of all examples that may be implemented or of all configurations within the scope of the present disclosure. The term "exemplary" should not be interpreted as "preferred" or "advantageous over other examples," but rather as "illustration, instance, or example." By reading this disclosure, including the description of the embodiments and figures, those skilled in the art will recognize that the technology disclosed herein may be implemented using alternative embodiments. Those skilled in the art will recognize that the embodiments, or specific features of the embodiments, described herein may be combined to arrive at still other embodiments for practicing the technology described in the present disclosure. Thus, the present disclosure is not limited to the examples and designs described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0080] The flowcharts and block diagrams in the figures illustrate example architecture, functionality, and operation of possible implementations of systems, methods, and devices according to various embodiments. It should be noted that in some alternative implementations, the functions noted in the blocks may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending on the functionality involved. Likewise, additional steps may be included in such methods, and certain steps may be omitted or combined, in methods consistent with various embodiments.

[0081] It is understood that the described embodiments are not mutually exclusive, and that elements, components, materials, or steps described in connection with one illustrative embodiment may be combined with or removed from other embodiments in any suitable manner to achieve desired design objectives.

[0082] References herein to "some embodiments" or "some exemplary embodiments" mean that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment. The appearances of the phrases "one embodiment," "some embodiments," or "another embodiment" in various places in this disclosure do not necessarily all refer to the same embodiments, nor do separate or alternative embodiments necessarily exclude other embodiments from one another.

[0083] Additionally, the articles "a" and "an," as used in this disclosure and the appended claims, should generally be construed to mean "one or more," unless otherwise specified or unless it is clear from the context that the singular form is intended.

[0084] Unless expressly stated otherwise, each numerical value and range should be interpreted as an approximation, such as by the word "about" or "approximately" preceding the value or range value.

[0085] Although elements in the following method claims, if any, are recited in a particular order, these elements are not necessarily intended to be limited to being performed in this particular order, unless the recitation of a claim otherwise suggests a particular order for performing some or all of these elements.

[0086] It is understood that certain features of the present disclosure, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features herein that are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable subcombination, or as appropriate in any other described embodiment herein. Certain features described in the context of various embodiments are not essential features of those embodiments, unless noted as such.

[0087] It will be further understood that various changes, substitutions, and variations in the details, materials, and arrangements of parts described and illustrated to explain the nature of the described embodiments may be made by those skilled in the art without departing from the scope of the present disclosure, and it is therefore intended that the following claims encompass all such alternatives, modifications, and variations as fall within the scope of the claims.

[0088] Appendix 1. 1. A method for sharing radio resource information, comprising: receiving first sidelink control information (SCI) at a first radio access technology (RAT) module, the first RAT module being configured to implement the first RAT; determining at least one first radio resource based on the first SCI; transmitting first information associated with the first SCI to a second RAT module, the second RAT module configured to implement a second RAT, the second RAT being different from the first RAT; receiving a second SCI at the first RAT module; determining at least one second radio resource based on the second SCI; determining whether to transmit second information associated with the second SCI to a second RAT module based at least on whether the determined at least one first radio resource matches the determined at least one second radio resource; A method comprising:

[0089] Appendix 2. 2. The method of claim 1, wherein determining at least one first radio resource is based on a first resource reservation interval indicated by the first SCI.

[0090] Appendix 3. The determined at least one first radio resource is a subframe in which the first SCI is received. After the frame, an integer multiple of the first resource reservation interval occurs, according to the method of appendix 2.

[0091] Appendix 4. 2. The method of claim 1, wherein the transmitted first information includes a first received signal measurement associated with the first SCI.

[0092] Appendix 5. 5. The method of claim 4, wherein the first received signal measurement comprises a first physical sidelink reference signal received power associated with the first SCI.

[0093] Appendix 6. 5. The method of claim 4, wherein determining whether to transmit the second information is further based on at least a second received signal measurement associated with the second SCI.

[0094] Appendix 7. 7. The method of claim 6, wherein at least one of the first signal measurement or the second received signal measurement is a received signal strength measurement.

[0095] Appendix 8. 7. The method of claim 6, wherein the second received signal measurement comprises a second physical sidelink reference signal measurement associated with the second SCI.

[0096] Appendix 9. 9. The method of claim 8, wherein the second physical sidelink reference signal measurement is a received signal power measurement.

[0097] Appendix 10. determining a difference between the first received signal measurement and the second received signal measurement; transmitting the second information to the second RAT module based on a condition that the determined difference is greater than a threshold; 6. The method of claim 5, further comprising:

[0098] Appendix 11. 11. The method of claim 10, wherein the second information includes a difference.

[0099] Appendix 12. 11. The method of claim 10, wherein the threshold depends on the sign of the difference.

[0100] Appendix 13. 11. The method of claim 10, wherein the threshold depends on a channel busy ratio determined by the first RAT module or the second RAT module.

[0101] Appendix 14. 11. The method of claim 10, wherein the threshold value depends on an observed congestion level or load of a communication interface between the first RAT module and the second RAT module.

[0102] Appendix 15. 2. The method of claim 1, wherein the first information includes a radio resource reservation index that identifies a periodic radio resource reservation associated with the first SCI.

[0103] Appendix 16. 2. The method of claim 1, wherein the second information includes a radio resource reservation index that identifies a periodic radio resource reservation associated with the first SCI.

[0104] Appendix 17. transmitting second information associated with the second SCI to the second RAT module based on the determination of whether to transmit the second information; 2. The method of claim 1, further comprising:

[0105] Appendix 18. 2. The method of claim 1, further comprising incrementing a radio resource reservation index counter by the first RAT module each time information is sent or received without a radio resource reservation index.

[0106] Appendix 19. 2. The method of claim 1, further comprising incrementing a radio resource reservation index counter by the second RAT module each time information is sent or received without a radio resource reservation index.

[0107] Appendix 20. transmitting third information from the first RAT module to the second RAT module, the third information indicating an end of the periodic radio resource reservation associated with the first SCI; 2. The method of claim 1, further comprising:

[0108] Appendix 21. The third piece of information is the second radio resource reservation interval indicated by the second SCI is zero; or 21. The method of claim 20, based on at least one of the first RAT module failing to receive a configured number of expected SCIs in succession.

[0109] Appendix 22. determining, by the second RAT module and based on the third information, that the periodic radio resource reservation associated with the first SCI is no longer valid; 21. The method of claim 20, further comprising:

[0110] Appendix 23. determining, by the second RAT module, termination of the periodic radio resource reservation associated with the first SCI based on the expiration of the timer; 23. The method of claim 22, further comprising:

[0111] Appendix 24. A user equipment (UE) for sharing radio resource information, comprising: a memory configured to store instructions; receiving first sidelink control information (SCI) at a first radio access technology (RAT) module in the UE, the first RAT module being configured to implement the first RAT; determining at least one first radio resource based on the first SCI; transmitting first information associated with the first SCI to a second RAT module, the second RAT module being configured to implement a second RAT; The RAT is different from the first RAT; and receiving a second SCI at the first RAT module; determining at least one second radio resource based on the second SCI; and determining whether to transmit second information associated with the second SCI to the second RAT module based at least on whether the determined at least one first radio resource matches the determined at least one second radio resource; a processor configured to execute instructions stored in a memory to perform the UE equipped with.

[0112] Appendix 25. The processor: determining at least one first radio resource based on the first resource reservation interval indicated by the first SCI; 25. The UE of claim 24, further configured to:

[0113] Appendix 26. 26. The UE of claim 25, wherein the determined at least one first radio resource occurs an integer multiple of a first resource reservation interval after the subframe in which the first SCI is received.

[0114] Appendix 27. 25. The UE of claim 24, wherein the transmitted first information includes a first received signal measurement associated with the first SCI.

[0115] Appendix 28. 28. The UE of claim 27, wherein the first received signal measurement comprises a first physical sidelink reference signal received power associated with the first SCI.

[0116] Appendix 29. The processor: determining whether to transmit the second information further based on at least a second received signal measurement associated with the second SCI; 28. The UE of Claim 27, further configured to:

[0117] Appendix 30. 20. The UE of claim 29, wherein at least one of the first signal measurement or the second received signal measurement is a received signal strength measurement.

[0118] 31. 20. The UE of claim 29, wherein the second received signal measurements include a second physical sidelink reference signal measurement associated with a second SCI.

[0119] Appendix 32. 32. The UE of claim 31, wherein the second physical sidelink reference signal measurement is a received signal power measurement.

[0120] Appendix 33. The processor: determining a difference between the first received signal measurement and the second received signal measurement; Based on a condition that the determined difference is greater than a threshold, the second information is stored in a second RAT module. Sending it to the 20. The UE of claim 29, further configured to:

[0121] Appendix 34. The UE of Appendix 33, wherein the second information includes a difference.

[0122] Appendix 35. 34. The UE of claim 33, wherein the threshold depends on the sign of the difference.

[0123] Appendix 36. 34. The UE of claim 33, wherein the threshold depends on a channel busy ratio determined by the first RAT module or the second RAT module.

[0124] Appendix 37. 34. The UE of claim 33, wherein the threshold value depends on an observed congestion level or load of a communication interface between the first RAT module and the second RAT module.

[0125] Appendix 38. 25. The UE of claim 24, wherein the first information includes a radio resource reservation index identifying a periodic radio resource reservation associated with the first SCI.

[0126] Appendix 39. 25. The UE of claim 24, wherein the second information includes a radio resource reservation index identifying a periodic radio resource reservation associated with the first SCI.

[0127] Appendix 40. The processor: transmitting second information associated with the second SCI to the second RAT module based on the determination of whether to transmit the second information; 25. The UE of claim 24, further configured to:

[0128] Appendix 41. The processor: 25. The UE of claim 24, further configured to increment, by the first RAT module, a radio resource reservation index counter each time information is sent or received without the radio resource reservation index.

[0129] Appendix 42. The processor: 25. The UE of claim 24, further configured to increment, by the second RAT module, a radio resource reservation index counter each time information is sent or received without the radio resource reservation index.

[0130] Appendix 43. The processor: transmitting third information from the first RAT module to the second RAT module, the third information indicating an end of periodic radio resource reservation associated with the first SCI; 25. The UE of claim 24, further configured to:

[0131] Appendix 44. The third piece of information is the second radio resource reservation interval indicated by the second SCI is zero; or The first RAT module fails to receive the configured number of expected SCIs in succession. UE of Appendix 43 based on at least one of

[0132] Appendix 45. The processor: determining, by the second RAT module and based on the third information, that the periodic radio resource reservation associated with the first SCI is no longer valid; 44. The UE of Claim 43, further configured to:

[0133] Appendix 46. The processor: determining, by the second RAT module, termination of the periodic radio resource reservation associated with the first SCI based on the expiration of the timer; 46. ​​The UE of Claim 45, further configured to:

[0134] Appendix 47. 1. A non-transitory computer-readable medium storing instructions executable by one or more processors of user equipment (UE) in a communication network for implementing a method for sharing radio resource information, the method comprising: receiving first sidelink control information (SCI) at a first radio access technology (RAT) module in the UE, the first RAT module being configured to implement the first RAT; determining at least one first radio resource based on the first SCI; transmitting first information associated with the first SCI to a second RAT module, the second RAT module configured to implement a second RAT, the second RAT being different from the first RAT; receiving a second SCI at the first RAT module; determining at least one second radio resource based on the second SCI; determining whether to transmit second information associated with the second SCI to a second RAT module based at least on whether the determined at least one first radio resource matches the determined at least one second radio resource; 1. A non-transitory computer-readable medium comprising:

Claims

1. 1. A method for sharing radio resource information, comprising: receiving first sidelink control information (SCI) at a first radio access technology (RAT) module, the first RAT module configured to implement a first RAT; determining at least one first radio resource based on the first SCI; transmitting first information associated with the first SCI to a second RAT module, the second RAT module configured to implement a second RAT, the second RAT being different from the first RAT; receiving a second SCI at the first RAT module; determining at least one second radio resource based on the second SCI; and determining whether to transmit second information associated with the second SCI to the second RAT module based at least on whether the determined at least one first radio resource matches the determined at least one second radio resource; A method comprising:

2. determining the at least one first radio resource based on a first resource reservation interval indicated by the first SCI; The method of claim 1.

3. the determined at least one first radio resource occurs an integer multiple of the first resource reservation interval after the subframe in which the first SCI is received. The method of claim 2.

4. the transmitted first information includes a first received signal measurement associated with the first SCI; The method of claim 1.

5. the first received signal measurement comprises a first physical sidelink reference signal received power associated with the first SCI. The method of claim 4.

6. determining whether to transmit the second information is further based on at least a second received signal measurement associated with the second SCI; The method of claim 4.

7. at least one of the first signal measurement or the second received signal measurement is a received signal strength measurement; The method of claim 6.

8. the second received signal measurement comprises a second physical sidelink reference signal measurement associated with the second SCI. The method of claim 6.

9. determining a difference between the first received signal measurement and the second received signal measurement; based on a condition that the determined difference is greater than a threshold value, the second information is and transmitting the further comprising: The method of claim 6.

10. the first information includes a radio resource reservation index that identifies a periodic radio resource reservation associated with the first SCI. The method of claim 1.

11. the second information includes a radio resource reservation index that identifies a periodic radio resource reservation associated with the first SCI. The method of claim 1.

12. transmitting the second information associated with the second SCI to the second RAT module based on the determination of whether to transmit the second information. further comprising: The method of claim 1.

13. incrementing a radio resource reservation index counter by the first RAT module each time information is transmitted or received without a radio resource reservation index. further comprising: The method of claim 1.

14. incrementing a radio resource reservation index counter by the second RAT module each time information is transmitted or received without a radio resource reservation index. further comprising: The method of claim 1.

15. transmitting third information from the first RAT module to the second RAT module, the third information indicating an end of periodic radio resource reservation associated with the first SCI; further comprising: The method of claim 1.

16. The third information is the second radio resource reservation interval indicated by the second SCI is zero; or the first RAT module fails to receive a configured number of expected SCIs consecutively; based on at least one of 16. The method of claim 15.

17. determining, by the second RAT module and based on the third information, that the periodic radio resource reservation associated with the first SCI is no longer valid. further comprising:

16. The method of claim 15.

18. The periodic timer associated with the first SCI is updated based on the expiration of a timer. determining by the second RAT module the termination of the radio resource reservation; further comprising:

18. The method of claim 17.

19. A user equipment (UE) for sharing radio resource information, comprising: a memory configured to store instructions; 1. A processor, comprising: receiving first sidelink control information (SCI) at a first radio access technology (RAT) module in the UE, the first RAT module being configured to implement a first RAT; determining at least one first radio resource based on the first SCI; transmitting first information associated with the first SCI to a second RAT module, the second RAT module configured to implement a second RAT, the second RAT being different from the first RAT; receiving a second SCI at the first RAT module; determining at least one second radio resource based on the second SCI; and determining whether to transmit second information associated with the second SCI to the second RAT module based at least on whether the determined at least one first radio resource matches the determined at least one second radio resource; a processor configured to execute the instructions stored in the memory to perform A UE comprising:

20. 1. A non-transitory computer-readable medium storing instructions executable by one or more processors of user equipment (UE) in a communications network for implementing a method for sharing radio resource information, the method comprising: receiving first sidelink control information (SCI) at a first radio access technology (RAT) module in the UE, the first RAT module being configured to implement a first RAT; determining at least one first radio resource based on the first SCI; transmitting first information associated with the first SCI to a second RAT module, the second RAT module configured to implement a second RAT, the second RAT being different from the first RAT; receiving a second SCI at the first RAT module; determining at least one second radio resource based on the second SCI; and determining whether to transmit second information associated with the second SCI to the second RAT module based at least on whether the determined at least one first radio resource matches the determined at least one second radio resource; 1. A non-transitory computer-readable medium comprising:

Images