Method, apparatus, and computer readable medium for sidelink communication

Abstract

The embodiment of the invention relates to a method and equipment for sidelink communication and a computer readable medium. A method for sidelink communication includes selecting, at a first terminal device, at least one physical sidelink shared channel (PSSCH) resource, where each of the at least one PSSCH resource is within a first type of sidelink resource or a second type of sidelink resource, and the first type of sidelink resources can be used for both a first sidelink associated with a first radio access technology (RAT) and a second sidelink associated with a second RAT, and the second type of sidelink resources can be used for the second sidelink. The method also includes transmitting the first sidelink data on the at least one PSSCH resource.

Description

Technical Field

[0001] Embodiments of the present disclosure relate generally to the field of telecommunications, and more particularly to methods, devices, and computer-readable media for sidelink communications. Background Art

[0002] There may be coexistence of Long Term Evolution (LTE) sidelink and New Radio (NR) sidelink. The coexistence of these two radio access technologies (RATs) may be based on the LTE sidelink and NR sidelink architectures. For the coexistence of the LTE sidelink and the NR sidelink, the NR sidelink terminal device may perform an NR Mode 2 sensing and resource selection process on the shared resources, and the LTE sidelink terminal device may perform an LTE Mode 4 sensing and resource selection process on the shared resources. The coexistence of the NR Mode 2 sensing and resource selection process and the LTE Mode 4 sensing and resource selection process within the shared resources is a key scenario. Summary of the invention

[0003] Generally speaking, example embodiments of the present disclosure provide methods, apparatus, and computer-readable media for sidelink communications.

[0004] In a first aspect, a method for sidelink communication is provided. The method includes: selecting at least one physical sidelink shared channel (PSSCH) resource at a first terminal device, wherein each of the at least one PSSCH resource is within a first type of sidelink resource or a second type of sidelink resource, and the first type of sidelink resource can be used for both a first sidelink associated with a first radio access technology (RAT) and a second sidelink associated with a second RAT, and the second type of sidelink resource can be used for the second sidelink; and sending first sidelink data on the at least one PSSCH resource.

[0005] In a second aspect, a method for sidelink communication is provided. The method includes: determining auxiliary information at a second terminal device; and sending the auxiliary information to a first terminal device for determining a first set of candidate resources, wherein the first set of candidate resources includes at least one candidate resource, and each of the candidate resources is included in a first type of sidelink resource, and the first type of sidelink resource can be used for both a first sidelink associated with a first radio access technology (RAT) and a second sidelink associated with a second RAT.

[0006] In a third aspect, a terminal device is provided. The terminal device includes a processor and a memory storing instructions. The memory and the instructions are configured to work together with the processor to enable the terminal device to execute the method according to the first aspect.

[0007] In a fourth aspect, a terminal device is provided. The terminal device includes a processor and a memory storing instructions. The memory and the instructions are configured to work together with the processor to enable the terminal device to execute the method according to the second aspect.

[0008] In a fifth aspect, there is provided a computer readable medium having instructions stored thereon. When the instructions are executed on at least one processor of a device, the instructions cause the device to perform the method according to the first aspect.

[0009] In a sixth aspect, there is provided a computer readable medium having instructions stored thereon. When the instructions are executed on at least one processor of a device, the instructions cause the device to perform the method according to the second aspect.

[0010] It should be understood that the summary is not intended to identify the key or essential features of the embodiments of the present disclosure, nor is it intended to be used to limit the scope of the present disclosure. Other features of the present disclosure will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of some embodiments of the present disclosure in the accompanying drawings, in which:

[0012] Figure 1 shows an example communication network in which embodiments of the present disclosure may be implemented;

[0013] Figure 2 An example of time resource allocation in a sidelink resource pool according to some embodiments of the present disclosure is shown;

[0014] Figure 3 shows an example of symbol allocation in a sidelink slot according to some embodiments of the present disclosure;

[0015] Figure 4 An example of frequency resource allocation in a sidelink resource pool according to some embodiments of the present disclosure is shown;

[0016] Figure 5 illustrates an example of a sidelink channel in the time domain according to some embodiments of the present disclosure;

[0017] Figure 6 An example of symbol allocation in a sidelink subframe according to other embodiments of the present disclosure is shown;

[0018] Figure 7 A flowchart illustrating an example method according to some embodiments of the present disclosure is shown;

[0019] Figure 8 and Fig. 9The signaling diagrams of the process for determining a candidate resource set according to some implementations of the present disclosure are respectively shown;

[0020] Figures 10 to 14 A signaling diagram of a process for selecting at least one PSSCH resource according to some implementations of the present disclosure is respectively shown;

[0021] Fig.15 A flowchart illustrating an example method according to some embodiments of the present disclosure; and

[0022] Fig.16 is a simplified block diagram of a device suitable for implementing embodiments of the present disclosure.

[0023] Throughout the drawings, the same or similar reference numerals refer to the same or similar elements. DETAILED DESCRIPTION

[0024] The principle of the present disclosure will now be described with reference to some example embodiments. It should be understood that these embodiments are described only for illustrative purposes and to help those skilled in the art understand and implement the present disclosure without implying any limitation on the scope of the disclosure. The disclosure described herein can be implemented in various ways different from the ways described below.

[0025] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0026] As used herein, the term "terminal device" refers to any device with wireless or wired communication capabilities. Examples of terminal devices include, but are not limited to, user equipment (UE), personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs), portable computers, tablets, wearable devices, Internet of Things (IoT) devices, ultra-reliable and low latency communications (URLLC) devices, Internet of Things (IoT) devices, machine type communications (MTC) devices, vehicle-mounted devices for V2X communications (where X represents pedestrian, vehicle, or infrastructure / network), devices for integrated access and backhaul (IAB), small data transfer (SDT), mobility, multicast and broadcast services (MBS), positioning, dynamic / flexible duplexing in commercial networks, reduced capacity (RedCap), space-borne vehicles or air-borne vehicles in non-terrestrial networks (NTNs) including satellites and high altitude platforms (HAPs) including unmanned aircraft systems (UAS). Extended Reality (XR) devices include different types of reality, such as Augmented Reality (AR), Mixed Reality (MR) and Virtual Reality (VR), Unmanned Aerial Vehicles (UAVs) commonly referred to as drones, devices on high-speed trains (HSTs), or image capture devices such as digital cameras, sensors, gaming devices, music storage and playback devices, or Internet devices that allow wireless or wired Internet access and browsing, etc. The 'terminal device' may further have 'multicast / broadcast' features to support public safety and critical missions, V2X applications, transparent IPv4 / IPv6 multicast delivery, IPTV, Smart TV, radio services, software delivery over wireless, group communications and IoT applications. It may also incorporate one or more Subscriber Identity Modules (SIMs), such as the well-known Multi-SIM. The term 'terminal device' may be used interchangeably with UE, mobile station, subscriber station, mobile terminal, user terminal or wireless device.

[0027] The term "network equipment" refers to equipment that is capable of providing or hosting a cell or coverage with which a terminal device can communicate. Examples of network equipment include, but are not limited to, a Node B (Node B or NB), an evolved Node B (eNodeB or eNB), a next generation Node B (gNB), a transmission reception point (TRP), a remote radio unit (RRU), a radio head (RH), a remote radio head (RRH), an IAB node, a low power node such as a femto node, a pico node, a reconfigurable intelligent surface (RIS), a network controlled repeater, etc.

[0028] Terminal devices or network devices can have artificial intelligence (AI) or machine learning capabilities. It usually includes models trained based on a large amount of data collected for a specific function and can be used to predict some information.

[0029] The terminal or network device can operate on several frequency ranges, such as FR1 (410MHz-7125MHz), FR2 (24.25GHz to 71GHz), bands greater than 100GHz, and terahertz (THz). It can also operate on licensed / unlicensed / shared spectrum. In the multi-radio dual connectivity (MR-DC) application scenario, the terminal device can have more than one connection with the network device. The terminal device or network device can operate in full-duplex, flexible duplex, and cross-division duplex modes.

[0030] The network equipment may have the functions of network energy saving, self-organizing network (SON) / minimization of drive test (MDT). The terminal may have the function of energy saving.

[0031] The embodiments of the present disclosure may be executed in a test device, such as a signal generator, a signal analyzer, a spectrum analyzer, a network analyzer, a test terminal device, a test network device, and a channel emulator.

[0032] Embodiments of the present disclosure may be performed in accordance with any generation of communication protocols currently known or developed in the future. Examples of communication protocols include, but are not limited to, first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, fifth generation (5G) communication protocols, 5.5G, 5G advanced networks, or sixth generation (6G) networks.

[0033] As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term "including" and its variations are to be read as open-ended terms meaning "including but not limited to". The term "based on" is to be read as "based at least in part on". The terms "some embodiments" and "embodiments" are to be read as "at least some embodiments". The term "another embodiment" is to be read as "at least one other embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may be included below.

[0034] In some examples, values, processes or devices are referred to as "best", "lowest", "highest", "minimum", "maximum", etc. It should be understood that such descriptions are intended to indicate that a selection may be made among a number of functional alternatives used, and that such selection is not necessarily better, lesser, higher or more preferred than other selections.

[0035] Figure 1 1 is a schematic diagram of an example communication network 100 in which embodiments of the present disclosure may be implemented. Figure 1As shown, the communication network 100 may include a first terminal device 110, a second terminal device 120, a third terminal device 130, and network devices 140 and 150. The network devices 140 and 150 may communicate with the first terminal device 110, the second terminal device 120, and the third terminal device 130 via respective wireless communication channels.

[0036] In some embodiments, each of the terminal devices 110 , 120 , and 130 and the network devices 140 and 150 may use a first radio access technology (RAT) or a second RAT.

[0037] In some embodiments, the first RAT may be Long Term Evolution (LTE) and the second RAT may be NR.

[0038] In an embodiment where the terminal devices 110, 120 and 130 and the network devices 140 and 150 use LTE, the terminal devices 110, 120 and 130 may be referred to as LTE terminal devices 110, 120 and 130, and the network devices 140 and 150 may be referred to as gNBs.

[0039] In an embodiment where the terminal devices 110, 120 and 130 and the network devices 140 and 150 use NR, the terminal devices 110, 120 and 130 may be referred to as NR terminal devices 110, 120 and 130, and the network devices 140 and 150 may be referred to as eNBs.

[0040] It should be understood that Figure 1 The number of devices in FIG. 1 is given for illustrative purposes and does not imply any limitation to the present disclosure. The communication network 100 may include any suitable number of network devices and / or terminal devices suitable for implementing the embodiments of the present disclosure.

[0041] The communication in the communication network 100 may conform to any suitable standard, including but not limited to Global System for Mobile Communications (GSM), LTE, LTE Evolution, Advanced LTE (LTE-A), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA), GSMEDGE Radio Access Network (GERAN), Machine Type Communication (MTC), etc. In addition, the communication may be performed according to any generation of communication protocols currently known or to be developed in the future. Examples of communication protocols include but are not limited to first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, fifth generation (5G) communication protocols.

[0042] In some embodiments, communications in the communication network 100 may include sidelink communications. Sidelink communications are wireless radio communications directly between two or more terminal devices, such as wireless radio communications between two or more terminal devices among the first terminal device 110, the second terminal device 120, and the third terminal device 130. In this type of communication, two or more terminal devices that are geographically adjacent to each other can communicate directly without passing through the network device 140 or 150 or through the core network. Therefore, data transmission in sidelink communications is different from typical cellular network communications, in which a terminal device sends data to or receives data from the network device 140 or 150 (i.e., uplink transmission). In sidelink communications, data is sent directly from a source terminal device (e.g., the first terminal device 110) to a target terminal device (e.g., the second terminal device 120) (i.e., sidelink transmission) via a unified air interface (e.g., a PC5 interface), such as Figure 1 shown.

[0043] Sidelink communication can provide several advantages, including reducing the data transmission load on the core network, system resource consumption, transmission power consumption and network operation cost, saving wireless spectrum resources and increasing the spectrum efficiency of the cellular wireless communication system.

[0044] In a sidelink communication system, sidelink resources are used to transmit information between terminal devices. Depending on the application scenario, service type, etc., sidelink communication methods include but are not limited to device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, etc.

[0045] V2X communications enable vehicles to communicate with other vehicles (i.e., vehicle-to-vehicle (V2V) communications), with infrastructure (i.e., vehicle-to-infrastructure (V2I) communications), with wireless networks (i.e., vehicle-to-network (V2N) communications), with pedestrians (i.e., vehicle-to-pedestrian (V2P) communications), and even with the owner's home (i.e., vehicle-to-home (V2H)). Examples of infrastructure include roadside units such as traffic lights, toll booths, etc. V2X communications can be used in a wide range of scenarios, including accident prevention and safety, convenience, traffic efficiency and clean driving, and ultimately related to autonomous or self-driving vehicles.

[0046] For sidelink communication, the terminal device uses resources in the sidelink resource pool to send or receive signals. The sidelink resource pool includes resources in the time domain and the frequency domain, which are dedicated resources for sidelink communication or shared by the sidelink communication and the cellular link. For sidelink communication, two resource allocation modes can be used for the sidelink, including the network device scheduling sidelink resources for the terminal device to perform sidelink signal transmission, which is called the mode 1 resource scheme in the NR sidelink or the mode 3 resource scheme in the LTE sidelink, and the terminal device selecting the sidelink resources by itself to perform sidelink signal transmission, which is called the mode 2 resource scheme in the NR sidelink or the mode 4 resource scheme in the LTE sidelink.

[0047] Figure 2 An example of time resource allocation in a sidelink resource pool according to some embodiments of the present disclosure is shown. In some embodiments, the sidelink resource pool may include an NR sidelink resource pool. In such an embodiment, the sidelink resource pool may be defined within a sidelink bandwidth part (BWP). The first terminal device 110, the second terminal device 120, and the third terminal device 130 may use uplink (UL) resources for sidelink communication. More than one sidelink resource pool may be configured for one of the first terminal device 110, the second terminal device 120, and the third terminal device 130. A dedicated resource pool may be used for a mode 1 resource scheme or a mode 2 resource scheme, referred to as a mode 1 resource pool or a mode 2 resource pool. For an LTE sidelink, a dedicated resource pool may be used for a mode 3 resource scheme or a mode 4 resource scheme, referred to as a mode 3 resource pool or a mode 4 resource pool. The resources within the sidelink resource pool may include physical sidelink control channel (PSCCH) resources, physical sidelink shared channel (PSSCH) resources, and physical sidelink feedback channel (PSFCH) resources. A bitmap may be used to indicate which UL time slots are configured as sidelink time slots. The length of a bitmap can be in the range of 10 to 160.

[0048] Figure 3 An example of symbol allocation in a sidelink time slot according to some embodiments of the present disclosure is shown. In a sidelink resource pool that may include multiple time slots and resource blocks (RBs), all or part of the symbols in a time slot may be used for sidelink transmission. Within the resource pool, of all symbols configured for the sidelink in each time slot, the first symbol (i.e., the start symbol) is used as an automatic gain control (AGC) symbol, and the last symbol is used as a guard period (GP) symbol. The AGC symbols and the GP symbols may be considered as fixed overhead in the sidelink resources. In the description of the following embodiments, the AGC symbols and the GP symbols are included in the sidelink symbols indicated by the sidelink channel resource configuration, and the AGC symbols carry redundant sidelink information, while the GP symbols are not used to carry sidelink information, such as Figure 3 shown.

[0049] The first terminal device 110, the second terminal device 120, and the third terminal device 130 may use a sidelink channel to send sidelink signaling or information. The sidelink channel includes at least one of the following: a PSCCH resource for carrying sidelink control information (SCI), a PSSCH resource for carrying sidelink data service information, a PSFCH resource for carrying sidelink hybrid automatic repeat request (HARQ) feedback information, a physical sidelink broadcast channel (PSBCH) resource for carrying sidelink broadcast information, and a physical sidelink discovery channel (PSDCH) resource for carrying a sidelink discovery signal.

[0050] Figure 4 An example of frequency resource allocation in a side link resource pool according to some embodiments of the present disclosure is shown. In some embodiments, the side link resource pool may be an NR side link resource pool. Figure 4 As shown, the sidelink resource pool can be configured within the SL bandwidth part (sidelink BWP). The resource pool configuration can include sl-StartRB-Subchannel (sidelink-start RB-subchannel) and sl-RB-Number (sidelink-RB-number). sl-StartRB-Subchannel can indicate the lowest resource block (RB) of the resource pool. The lowest RB is also called the starting RB. sl-RB-number can indicate the total number of RBs in the resource pool.

[0051] The RBs in the resource pool may be divided into consecutive subchannels. A subchannel is a frequency resource unit of the PSSCH. Each subchannel contains consecutive RBs. Terminal devices 110, 120, and 130 may use one or more consecutive subchannels as PSSCH resources to send sidelink data. The subchannel configuration of the resource pool may include s1-SubchannelSize (sidelink-subchannel size) indicating the number of RBs contained in one subchannel. The subchannel size may be equal to 10, 12, 15, 20, 25, 50, 75, or 100.

[0052] Figure 5 An example of a side link channel in the time domain according to some embodiments of the present disclosure is shown. Figure 5In the example, the sidelink channel includes PSCCH and PSSCH. PSCCH can carry SCI format 1. One PSCCH can be defined in each subchannel. Each PSCCH resource may include t consecutive symbols in the time domain and k consecutive RBs in the frequency domain. The t symbols start from the first symbol of the available symbols in the time domain, where t=2 or 3. The k RBs start from the first RB in the corresponding subchannel, where k=10, 12, 15, 20 or 25. PSSCH can carry SCI format 2A / 2B, and the sidelink data PSSCH uses subchannels as frequency units. Terminal devices 110, 120 and 130 can use one or more consecutive subchannels as PSSCH resources to send sidelink data.

[0053] Similar to the NR side link resource pool, in the LTE side link resource pool, the first terminal device 110, the second terminal device 120 or the third terminal device 130 can use the uplink (UL) resources for side link communication. More than one side link resource pool can be configured for the first terminal device 110, the second terminal device 120 or the third terminal device 130. The resources in the LTE side link resource pool may include a PSCCH resource pool and a PSSCH resource pool. A bitmap can be used to indicate which UL subframes are configured as side link subframes.

[0054] Figure 6 An example of symbol allocation in a sidelink subframe according to other embodiments of the present disclosure is shown. In some embodiments, Figure 6 The side link subframe in may be an LTE side link subframe. Figure 6 As shown, all symbols in a subframe are used as sidelink resources. In a subframe, the first symbol is used as AGC and the last symbol is used as GP.

[0055] LTE side link channels may include PSCCH and PSSCH. PSCCH may carry SCI format 1. One PSCCH is associated with one subchannel. Each PSCCH resource has a fixed size. For example, each PSCCH resource may include two consecutive PRBs and all symbols in a side link subframe. PSSCH may carry side link data and use subchannels as frequency units. The first terminal device 110, the second terminal device 120, or the third terminal device 130 may use one or more consecutive subchannels as PSSCH resources to send side link data. The relationship between PSCCH and subchannel may be a one-to-one mapping.

[0056] As described above, for the coexistence of the LTE side link and the NR side link, the NR side link terminal device can perform the NR mode 2 sensing and resource selection process on the shared resources, and the LTE side link terminal device can perform the LTE mode 4 sensing and resource selection process on the shared resources. The coexistence of the NR mode 2 sensing and resource selection process and the LTE mode 4 sensing and resource selection process within the shared resources is a key scenario. In such a scenario, the NR side link terminal device can determine its own side link transmission resources considering the sensing results and resource reservation information of the LTE side link.

[0057] Embodiments of the present disclosure provide a solution for sidelink communication to solve the above-mentioned problems and one or more other potential problems. According to the solution, a first terminal device selects at least one PSSCH resource and sends first sidelink data on the at least one PSSCH resource. Each of the at least one PSSCH resource is within a first type of sidelink resource or a second type of sidelink resource. The first type of sidelink resource can be used for both a first sidelink associated with a first RAT and a second sidelink associated with a second RAT. The second type of sidelink resource can be used for a second sidelink. In the following, reference will be made to Figures 7 to 15 The principles of the present disclosure are described.

[0058] Figure 7 1 is a flowchart of an example method according to some embodiments of the present disclosure. In some embodiments, method 700 may be implemented at a terminal device, for example Figure 1 For the purpose of discussion, reference will be made to the first terminal device 110, the second terminal device 120, and the third terminal device 130. Figure 1 Method 700 is described herein without loss of generality.

[0059] In block 710, the first terminal device 110 selects at least one PSSCH resource. Each of the at least one PSSCH resource is within a first type of side link resource or a second type of side link resource. The first type of side link resource can be used for both a first side link associated with a first RAT and a second side link associated with a second RAT. The second type of side link resource can be used for a second side link.

[0060] At block 720 , the first terminal device 110 sends first sidelink data on at least one PSSCH resource.

[0061] Utilizing method 700, coexistence of NR Mode 2 sensing and resource selection process and LTE Mode 4 sensing and resource selection process within shared resources may be achieved.

[0062] In some embodiments, the side link resource of the first type may be an overlapping resource of a first side link resource pool for a first side link and a second side link resource pool for a second side link. In other words, the side link resource of the first type may be a shared resource between the first side link resource pool and the second side link resource pool. In the present disclosure, the terms "overlap" and "shared" may be used interchangeably.

[0063] On the other hand, dedicated resources can be used for the first side link or the second side link and may not overlap with each other. Therefore, the terms "non-overlapping" and "dedicated" can be used interchangeably. In some embodiments, the side link resources of the second type can be non-overlapping or dedicated resources of the second side link.

[0064] In some embodiments, the first RAT may be LTE and the second RAT may be NR. In such an embodiment, the first side link may be a side link associated with LTE (also referred to as an LTE side link), and the second side link may be a side link associated with NR (also referred to as an NR side link). In addition, the first side link resource pool may be a side link resource pool associated with LTE (also referred to as an LTE side link resource pool), and the second side link resource pool may be a side link resource pool associated with NR (also referred to as an NR side link resource pool).

[0065] In the following, some embodiments of the present disclosure will be described by taking LTE side link and NR side link as examples. It should be understood that the scheme of the present disclosure can be applied to other RATs besides LTE and NR.

[0066] Configuration or pre-configuration of the first type of side link resources

[0067] In some embodiments, the first terminal device 110 may select at least one PSSCH resource based on a configuration or pre-configuration of the first type of side link resources.

[0068] In some embodiments, the configuration or pre-configuration of the first type of side link resources may include:

[0069] A first indication, indicating whether all resources in the side link resource pool are side link resources of the first type, or

[0070] A second indication, indicating whether the first terminal device 110 is capable of selecting at least one PSSCH resource within the first type of side link resources.

[0071] In such an embodiment, the configuration or pre-configuration of the first type of side link resources may be provided as follows:

[0072] -SL-LTE-NR-Coex:

[0073] SL-CoexENUMERATED{enable,disable}

[0074] Wherein SL-LTE-NR-coex represents the configuration or pre-configuration of the first type of side link resources, and SL-coex represents the first indication or the second indication.

[0075] In an embodiment where SL-coex represents a first indication, if SL-coex is configured to be enabled for a resource pool, it indicates that all resources in the side link resource pool are side link resources of the first type. If SL-coex is configured to be disabled for a resource pool, it indicates that the resources in the side link resource pool are not side link resources of the first type. The side link resource pool may be a side link resource pool of a second side link or a side link resource pool of a first side link. For example, the side link resource pool may be an NR side link resource pool or an LTE side link resource pool.

[0076] In an embodiment where SL-coex represents the second indication, if SL-coex is configured to be enabled for the first terminal device 110, it indicates that the first terminal device 110 is able to select at least one PSSCH resource within the first type of side link resources. If SL-coex is configured to be disabled for the first terminal device 110, it indicates that the first terminal device 110 cannot select at least one PSSCH resource within the first type of side link resources.

[0077] In some embodiments, the configuration or pre-configuration of the first type of side link resources may include at least one of the following:

[0078] A first channel busy rate (CBR) of a first side link resource pool of a first side link

[0079] Threshold, or

[0080] A first channel occupancy rate (CR) threshold of the first side link resource pool.

[0081] In such an embodiment, the configuration or pre-configuration of the first type of side link resources may be provided as follows:

[0082] -SL-LTE-NR-Coex:

[0083] ·sl-CBRThreshold-CoexLTE INTEGER(0..100)

[0084] sl-CRThreshold-CoexLTE INTEGER(0..10000) where SL-LTE-NR-Coex represents the configuration or pre-configuration of the first type of side link resources, sl-CBRThreshold-CoexLTE represents the first CBR threshold of the LTE side link resource pool, and sl-CRThreshold-CoexLTE represents the first CR threshold of the LTE side link resource pool. A value of 0 for the first CBR threshold corresponds to 0, a value of 1 for the first CBR threshold corresponds to 0.01, a value of 2 for the first CBR threshold corresponds to 0.02, and so on. A value of 0 for the first CR threshold corresponds to 0, a value of 1 for the first CR threshold corresponds to 0.0001, a value of 2 for the first CR threshold corresponds to 0.0002, and so on (i.e., in steps of 0.0001) up to a value of 10000 corresponding to 1.

[0085] In some embodiments, the configuration or pre-configuration of the first type of side link resources (SL-LTE-NR-Coex) may include at least one of sl-CBRThreshold-CoexLTE and sl-CRThreshold-CoexLTE.

[0086] In some embodiments, if the CBR of the first side link resource pool is equal to or higher than the first CBR threshold, the first terminal device 110 cannot select at least one PSSCH resource within the first type of side link resources. If the CBR of the first side link resource pool is equal to or lower than the first CBR threshold, the first terminal device 110 is able to select at least one PSSCH resource within the first type of side link resources.

[0087] In some embodiments, if the CR of the first side link resource pool is equal to or higher than a first CR threshold, the first terminal device 110 cannot select at least one PSSCH resource within the first type of side link resources. If the CR of the first side link resource pool is equal to or lower than the first CR threshold, the first terminal device 110 is able to select at least one PSSCH resource within the first type of side link resources.

[0088] In some embodiments, the configuration or pre-configuration of the first type of side link resources may include at least one of the following:

[0089] a second CBR threshold of a second side link resource pool for a second side link, or

[0090] A second CR threshold of the second side link resource pool.

[0091] In such an embodiment, the configuration or pre-configuration of the first type of side link resources may be provided as follows:

[0092] -SL-LTE-NR-Coex:

[0093] ·sl-CBRThreshold-CoexNR INTEGER(0..100)

[0094] sl-CRTthreshold-CoexNR INTEGER(0..10000) where SL-LTE-NR-Coex represents the configuration or pre-configuration of the first type of side link resources, sl-CBRThreshold-CoexNR represents the second CBR threshold for the NR side link resource pool, and sl-CRThreshold-CoexNR represents the second CR threshold for the NR side link resource pool. A value of 0 for the second CBR threshold corresponds to 0, a value of 1 for the second CBR threshold corresponds to 0.01, a value of 2 for the second CBR threshold corresponds to 0.02, and so on. A value of 0 for the second CR threshold corresponds to 0, a value of 1 for the second CR threshold corresponds to 0.0001, a value of 2 for the second CR threshold corresponds to 0.0002, and so on (i.e., in steps of 0.0001) up to a value of 10000 corresponding to 1.

[0095] In some embodiments, the configuration or pre-configuration of the first type of side link resources (SL-LTE-NR-Coex) may include at least one of sl-CBRThreshold-CoexNR and sl-CRThreshold-CoexNR.

[0096] In some embodiments, if the CBR of the second side link resource pool is equal to or higher than the second CBR threshold, the first terminal device 110 is able to select at least one PSSCH resource within the first type of side link resources. If the CBR of the second side link resource pool is equal to or lower than the second CBR threshold, the first terminal device 110 is unable to select at least one PSSCH resource within the first type of side link resources.

[0097] In some embodiments, if the CR of the second side link resource pool is equal to or higher than the second CR threshold, the first terminal device 110 is able to select at least one PSSCH resource within the first type of side link resources. If the CR of the second side link resource pool is equal to or lower than the second CR threshold, the first terminal device 110 is unable to select at least one PSSCH resource within the first type of side link resources.

[0098] In some embodiments, the CBR measured in time slot n may be determined as a portion of a subchannel in the sidelink resource pool for which the SL received signal strength indication (RSSI) measured by the first terminal device 110 exceeds a (pre-)configured threshold sensed within the CBR measurement window [na, n-1] according to the high-level parameter sl-TimeWindowSizeCBR, where a is equal to 100 or 100·2 μ time slots.

[0099] In some embodiments, the CR evaluated at time slot n can be determined as the total number of subchannels used for transmission by the first terminal device 110 in time slot [na, n-1] and permitted in time slot [n, n+b] divided by the total number of subchannels configured in the transmission pool on [na, n+b].

[0100] In some embodiments, at least one of the first CBR threshold, the first CR threshold, the second CBR threshold, and the second CR threshold may be configured according to a priority of the sidelink data.

[0101] In such an embodiment, the configuration or pre-configuration of the first type of side link resources may be provided as follows:

[0102] -SL-LTE-NR-Coexlist:SEQUENCE(SIZE(1..8))OFSL-LTE-NR-Coex(SL-LTE-NR-Coex sequence)

[0103] SL-LTE-NR-Coex:

[0104] sl-PriorityThresholdINTEGER(1..8)

[0105] sl-CBRThreshold-Coex INTEGER(0..100)

[0106] sl-CRThreshold-Coex INTEGER(0..10000) where SL-LTE-NR-coexlist represents a list of CR / CBR thresholds configured by priority for the sidelink resource pool, sl-PriorityThreshold represents the priority threshold for the sidelink data, sl-CBRThreshold-coex represents the first CBR threshold associated with the sl-PriorityThreshold of the LTE sidelink resource pool or the second CBR threshold associated with the sl-PriorityThreshold of the NR sidelink resource pool, and sl-CRThreshold-coex represents the first CR threshold associated with the sl-PriorityThreshold of the LTE sidelink resource pool or the second CR threshold associated with the sl-PriorityThreshold of the NR sidelink resource pool. For each priority level (of data on PSSCH), the associated CR / CBR threshold is configured for the Mode 2 process associated with the shared resources.

[0107] In some embodiments, SL-LTE-NR-coexlist may include at least one of sl-CBRThreshold-coex and sl-CRThreshold-coex.

[0108] In some embodiments, the configuration or pre-configuration of the first type of side link resources includes a priority threshold.

[0109] In such an embodiment, the configuration or pre-configuration of the first type of side link resources may be provided as follows:

[0110] -SL-LTE-NR-Coex:

[0111] ·SL-Coex-PriorityThreshold INTEGER(1..8)

[0112] Among them, SL-LTE-NR-coex represents the configuration or pre-configuration of the first type of side link resources, and SL-coex-PriorityThreshold represents the priority threshold.

[0113] In some embodiments, a priority threshold (SL-coex-PriorityThreshold) may be used to determine whether a shared resource can be used for transmission of the first side link data. If the first priority of the first side link data is equal to or higher than the priority threshold, the first terminal device 110 may select at least one PSSCH resource within the first type of side link resources. Alternatively, if the first priority of the first side link data is equal to or lower than the priority threshold, the first terminal device 110 may select at least one PSSCH resource within the first type of side link resources.

[0114] In some embodiments, the configuration or pre-configuration of the first type of side link resources may include a list of reference signal received power (RSRP) thresholds for the first type of side link resources.

[0115] In such an embodiment, the configuration or pre-configuration of the first type of side link resources may be provided as follows:

[0116] -SL-LTE-NR-Coex:

[0117] SL-Thres-RSRP-List SEQUENCE(SIZE(64))OFSL-Thres-RSRP-r16(SL-Thres-RSRP-r16 sequence(size) (64))))

[0119] SL-Thres-RSRP-r16INTEGER(0..66)

[0120] Wherein SL-LTE-NR-Coex represents the configuration or pre-configuration of the first type of side link resources, sl-Thres-RSRP-List represents the RSRP threshold list of the first type of side link resources including 64 RSRP thresholds, and SL-Thres-RSRP-r16 represents the RSRP threshold in the list. The RSRP threshold should be selected based on the priority in the decoded SCI and the priority in the SCI to be sent. If a resource is indicated or reserved by the decoded SCI and the PSSCH / PSCCH RSRP in the associated data resource is higher than or equal to the RSRP threshold, the resource is excluded.

[0121] By using at least one threshold as described above, shared resource usage can be managed, potential resource conflicts can be controlled, and resource efficiency can be improved.

[0122] II. Selection of at least one PSSCH resource

[0123] In some embodiments, the first terminal device 110 may determine a candidate resource set based on the auxiliary information, and select at least one PSSCH resource from the candidate resource set. A express.

[0124] In such an embodiment, the candidate resource set may include at least one of the first candidate resource set or the second candidate resource set. For example, the candidate resource set may include the first candidate resource set, the second candidate resource set, or a combination of the first candidate resource set and the second candidate resource set.

[0125] In some embodiments, at least one candidate resource is included in a first set of candidate resources, and each of the at least one candidate resource included in the first set of candidate resources is included in a first type of side link resource. A-LTE express.

[0126] In some embodiments, at least one candidate resource is included in the second candidate resource set, and each of the at least one candidate resource included in the second candidate resource set is included in the side link resource of the second type. A-NR express.

[0127] In some embodiments, the first terminal device 110 may include a first module of a first side link and a second module of a second side link. In such embodiments, the first terminal device 110 may be referred to as a type A side link terminal device 110 or a type A side link UE 110.

[0128] In an embodiment where the first side link is an LTE side link and the second side link is an NR side link, the first module can be an LTE side link module and the second module can be an NR side link module. For the UE, the MAC entity-NR can be associated with the NR side link module, and the MAC entity-LTE can be associated with the LTE side link module.

[0129] In the following, the LTE side link and the NR side link are taken as examples to describe the determination of the candidate resource set S. A It should be understood that the scheme of the present disclosure can be applied to other RATs besides LTE and NR.

[0130] In some embodiments, the candidate resource set S A It can be determined by the first module (eg, LTE side link module) of the first terminal device 110. This will refer to Figure 8 Give a description.

[0131] Figure 8The method for determining the candidate resource set S according to some implementations of the present disclosure is shown. A For the purpose of discussion, reference will be made to the signaling diagram of the process 800. Figure 1 Process 800 is described. Process 800 may include the following: Figure 1 The first terminal device 110 shown. Figure 1 The process 800 is described in the communication network 100 of FIG. 8 , but the process can also be applied to other communication scenarios.

[0132] In process 800, the first terminal device 110 includes a first module of a first side link (e.g., an LTE side link module 111) and a second module of a second side link (e.g., an NR side link module 112). In this regard, the first terminal device 110 is also referred to as a type A side link UE 110. The LTE side link module 111 determines a first candidate resource set S A-LTE The NR side link module 112 is based on the first candidate resource set S A-LTE At least one PSSCH resource is selected for sending first sidelink data.

[0133] like Figure 8 As shown, the NR side link module 112 determines 810 first side link data to be sent, which may use a first type of side link resource (e.g., a shared resource).

[0134] In turn, the NR side link module 112 provides a request for auxiliary information to the LTE side link module 111.

[0135] In some embodiments, the NR sidelink module 112 may provide a request for auxiliary information by providing 820 requirement information regarding the first sidelink data.

[0136] In some embodiments, the requirement information about the first side link data may include at least one of the following:

[0137] an identifier of a first side link resource pool of the first side link,

[0138] an identifier of a second side link resource pool of the second side link,

[0139] an identification of a side link resource of the first type,

[0140] the size of a transport block associated with the first sidelink data,

[0141] the size of a medium access control packet data unit (MAC PDU) associated with the first sidelink data,

[0142] the number of subchannels or resource blocks to be selected for transmission of the first sidelink data,

[0143] A priority level for the first side link data,

[0144] The period of the first side link data,

[0145] a resource selection window for at least one PSSCH resource, or

[0146] • Number of retransmissions for the first sidelink data.

[0147] After receiving the request for assistance information, the LTE sidelink module 111 performs 830 an LTE sidelink Mode 4 sensing and resource selection process based on the requirement information. Further, the LTE sidelink module 111 determines 840 a first set of candidate resources S within the first type of sidelink resources. A-LTE .

[0148] In some embodiments, in order to determine the first candidate resource set S A-LTE , the LTE side link module 111 may exclude resources that are not included in the first type of side link resources from the initial candidate resource set in the first side link resource pool. For example, in the case of an LTE side link resource pool that partially overlaps with the NR side link resource pool, the LTE side link module 111 may perform a Mode 4 process in the LTE side link resource pool and exclude resources that are not included in the first type of side link resources from the initial candidate resource set in the first side link resource pool. A-LTE Exclude non-overlapping resources from the .

[0149] In other embodiments, for an LTE side link resource pool that completely overlaps with the NR side link resource pool, i.e., a shared resource pool, the LTE side link module 111 may perform a mode 4 process within the LTE side link resource pool to determine a first candidate resource set S within the first type of side link resources. A-LTE .

[0150] In other embodiments, for the case of an LTE side link resource pool that partially overlaps with the NR side link resource pool, the LTE side link module 111 can perform a mode 4 process within the overlapping resources, i.e., setting an initial candidate resource set within the shared portion of the resources.

[0151] After determining the first candidate resource set S A-LTE After that, the LTE side link module 111 sets the first candidate resource set S A-LTE Provide 850 to the NR side link module 112.

[0152] In an embodiment where the NR sidelink module 112 provides a request for auxiliary information to the LTE sidelink module 111 by providing requirement information about the first sidelink data, the LTE sidelink module 111 provides the first candidate resource set S to the NR sidelink module 112. A-LTEAs auxiliary information.

[0153] After receiving the first candidate resource set S A-LTE After that, the NR side link module 112 is based on the first candidate resource set S A-LTE At least one PSSCH resource is selected 860.

[0154] For example, the NR side link module 112 may select S A-LTE At least one PSSCH resource within the NR side link, that is, NR side link mode 2 sensing and resource selection process on the NR side link are not required, and the selected at least one PSSCH resource is a shared resource.

[0155] For another example, the NR side link module 112 may perform an NR side link mode 2 sensing and resource selection process on the NR side link to determine a second candidate resource set S A-NR .

[0156] The NR Mode 2 sensing and resource selection process may include one of the following: a complete sensing process, a partial sensing process, or a random selection process. In the complete sensing process, the first terminal device 110 may set the initial candidate resource set to a complete set. The first terminal device 110 may then determine the second candidate resource set S by excluding unavailable resources from the initial candidate resource set. A-NR .

[0157] The NR side link module 112 may combine the first candidate resource set S A-LTE and the second candidate resource set S A-NR , to determine the candidate resource set S A The NR side link module 112 can then select the candidate resource set S A At least one PSSCH resource is selected within S for data transmission. In this way, the at least one PSSCH resource selected for data transmission can be A-LTE Inner or S A-NR Inside.

[0158] Process 800 provides an enhanced legacy LTE Mode 4 or NR Mode 2 process to determine resources for sidelink transmissions in a coexistence scenario with limited impact and enhancements to the NR SL module.

[0159] Using process 800, potential resource conflicts between LTE and NR sidelink transmissions may be avoided.

[0160] Furthermore, in combination with the configuration or pre-configuration of the first type of side link resources as described in Section I, process 800 may provide flexibility and configurability for SL coexistence.

[0161] In some embodiments, the candidate resource set S A It can be determined by the second module (e.g., NR side link module) of the first terminal device 110. This will refer to Fig. 9 Give a description.

[0162] Fig. 9 The method for determining the candidate resource set S according to some other implementations of the present disclosure is shown. A For the purpose of discussion, reference will be made to the signaling diagram of the process 900. Figure 1 Process 900 is described. Process 900 may include the following: Figure 1 The first terminal device 110 shown. Figure 1 The process 900 is described in the communication network 100 of FIG. 1 , but the process can also be applied to other communication scenarios.

[0163] Similar to process 800, in process 900, the first terminal device 110 includes a first module of a first side link (e.g., an LTE side link module 111) and a second module of a second side link (e.g., an NR side link module 112).

[0164] The difference between process 900 and process 800 is that the first terminal device 110 does not determine the first candidate resource set S A-LTE Instead, the first terminal device 110 determines the auxiliary information and provides the auxiliary information to the NR side link module 112. The NR side link module 112 determines the first candidate resource set S A-LTE Then, the NR side link module 112 selects the first candidate resource set S A-LTE At least one PSSCH resource is selected for sending first sidelink data.

[0165] like Fig. 9 As shown, the NR side link module 112 determines 910 first side link data to be sent, which may use a first type of side link resource (e.g., a shared resource).

[0166] In turn, the NR side link module 112 provides a request for auxiliary information to the LTE side link module 111.

[0167] In some embodiments, the NR sidelink module 112 may provide a request for auxiliary information by providing 920 a trigger indication.

[0168] The NR side link module 112 performs 930 NR Mode 2 sensing and resource selection process on the NR side link to determine a second candidate resource set S A-NR .

[0169] On the LTE side link module 111 side, when a trigger indication is received, the LTE side link module 111 performs 940 the following actions on the LTE side link to determine the auxiliary information:

[0170] Sensing and SCI decoding within a sensing window or within a first type of sidelink resource on the LTE sidelink; and

[0171] • PSCCH RSRP or PSSCH RSRP measurement associated with the decoded SCI.

[0172] In such an embodiment, the auxiliary information may include at least one of the following:

[0173] • Subframes on which the LTE sidelink module 111 does not perform sensing.

[0174] an SCI decoded by the LTE sidelink module 111 within a sidelink resource of the first type,

[0175] The subframe position of each SCI in the SCI,

[0176] The PSCCH resources associated with each SCI,

[0177] The RSRP on the PSSCH resources associated with each SCI, or

[0178] • RSRP on the PSCCH resources associated with each SCI.

[0179] In such an embodiment, the content and format of the assistance information to be determined by the LTE sidelink module 111 may be predefined.

[0180] After determining the auxiliary information, the LTE side link module 111 provides 950 the auxiliary information to the NR side link module 112.

[0181] After receiving the auxiliary information, the NR side link module 112 determines 960 a first candidate resource set S based on the auxiliary information. A-LTE .

[0182] In some embodiments, in order to determine the first candidate resource set S A-LTE , the NR sidelink module 112 may set the initial candidate resource set to all resources within the shared resources. Then, the NR sidelink module 112 may exclude resources on subframes on which the LTE sidelink module 111 does not perform sensing from the initial candidate resource set. In addition, based on the decoded SCI, the NR sidelink module 112 may exclude the associated PSSCH resources when all of the following conditions are met:

[0183] The RSRP of the PSSCH is higher than the threshold determined by the priority indicated by the SCI and the priority of the data to be transmitted;

[0184] • Reserved PSSCH resources associated with the SCI, including periodic reservations and reservations for retransmissions.

[0185] Then, the NR side link module 112 sets the candidate resource set S A Determine 970 as the second candidate resource set S A-NR and the first candidate resource set S A-LTE Furthermore, the NR side link module 112 is based on the candidate resource set S A Select 980 at least one PSSCH resource for sending the first sidelink data. For example, the NR sidelink module 112 may select a first candidate resource set S from the shared resources. A-LTE For another example, the NR side link module 112 may select the second candidate resource set S A-NR At least one PSSCH resource within.

[0186] In other embodiments, the NR side link module 112 may not set the candidate resource set S A Determined as the second candidate resource set S A-NR and the first candidate resource set S A-LTE On the contrary, the NR side link module 112 can be a candidate resource set S A Determined as the first candidate resource set S A-LTE .

[0187] Process 900 may have limited impact on LTE Mode 4 processes and place less demands and workload on the LTE SL module. The NR SL module obtains auxiliary information and determines resource selection accordingly, which may provide more appropriate resources for the sidelink coexistence scenario.

[0188] In some embodiments, the first terminal device 110 may only include the second module of the second side link. In such an embodiment, the first terminal device 110 may be referred to as a type B side link terminal device or UE 110.

[0189] In some embodiments, the first terminal device 110 may receive auxiliary information from the second terminal device 120. In such an embodiment, the second terminal device 120 includes a first module of the first side link and a second module of the second side link. Figures 10 to 14 Give a description.

[0190] Fig.10A signaling diagram of a process 1000 for selecting at least one PSSCH resource according to some implementations of the present disclosure is shown. For the purpose of discussion, reference will be made to Figure 1 Process 1000 is described. Process 1000 may include the following: Figure 1 The first terminal device 110 and the second terminal device 120 are shown. Figure 1 The process 1000 is described in the communication network 100 of FIG. 1 , but the process can also be applied to other communication scenarios.

[0191] In process 1000, the first terminal device 110 includes only the second module of the second side link (e.g., the NR side link module). The second terminal device 120 includes the first module of the first side link (e.g., the LTE side link module) and the second module of the second side link (e.g., the NR side link module). In this regard, the first terminal device 110 and the second terminal device 120 are also referred to as type B UE 110 and type A UE 120. UE 120 .

[0192] like Fig.10 As shown, the first terminal device 110 determines 1010 first side link data to be sent, which can use a first type of side link resource (e.g., a shared resource).

[0193] Then, the first terminal device 110 sends a request for auxiliary information to the second terminal device 120 .

[0194] In some embodiments, the first terminal device 110 may send the request for the auxiliary information by sending 1020 a request for inter-UE coordination information for coexistence (IUC-coex information).

[0195] In some embodiments, the IUC-coex information may include at least one of the following:

[0196] a preferred set of resources within the first type of sidelink resources for transmission of first sidelink data,

[0197] a set of non-preferred resources within the first type of sidelink resources for transmission of the first sidelink data, or

[0198] • An indication of a potential conflict between first reserved resources within the first type of sidelink resources for transmission of the first sidelink data and second reserved resources for transmission of the third terminal device.

[0199] After receiving the request for IUC-Coex information, the second terminal device 120 determines 1030 IUC-Coex information based on the request.

[0200] Then, the second terminal device 120 sends 1040 the IUC-Coex information to the first terminal device 110. In an embodiment in which the first terminal device 110 sends a request for auxiliary information by sending 1020 a request for IUC-Coex information, the second terminal device 120 sends a response to the request for auxiliary information to the first terminal device 110. The response includes the IUC-Coex information.

[0201] After receiving the IUC-coex information, the first terminal device 110 selects 1050 at least one PSSCH resource for sending first side link data based on the IUC-coex information.

[0202] The first terminal device 110 then sends 1060 first side link data to the second terminal device 120 on the selected at least one PSSCH resource.

[0203] The Mode 2 IUC scheme is modified to enable Type B UEs to use shared resources for sidelink communications using process 1000. Process 1000 has less impact on conventional NR Mode 2 sensing and resource selection processes.

[0204] Fig.11 A signaling diagram of a process 1100 for selecting at least one PSSCH resource according to some other implementations of the present disclosure is shown. For the purpose of discussion, reference will be made to Figure 1 Process 1100 is described. Process 1100 may include the following: Figure 1 The first terminal device 110, the second terminal device 120 and the third terminal device 130 are shown. Figure 1 The process 1100 is described in the communication network 100 of FIG. 1 , but the process can also be applied to other communication scenarios.

[0205] In the process 1100, each of the first terminal device 110 and the third terminal device 130 includes only the second module of the second side link (e.g., the NR side link module). In this regard, the first terminal device 110 and the third terminal device 130 are also referred to as type B UE 110 and type B UE 130.

[0206] The second terminal device 120 includes a first module of a first side link (e.g., an LTE side link module) and a second module of a second side link (e.g., an NR side link module). In this regard, the second terminal device 120 is also referred to as a type A UE 120.

[0207] The process 1100 differs from the process 1000 in that the second terminal device 120 does not determine the IUC-coex information based on the request for the IUC-coex information. Instead, when the second terminal device 120 determines that at least one predefined condition is met, the second terminal device 120 determines 1110 the IUC-coex information.

[0208] In some embodiments, the predefined condition may be determined according to a preconfiguration of a configuration of the IUC-coex information, the preconfiguration comprising at least one of the following:

[0209] Determining whether and when to send IUC-coex information depends on the implementation of the second terminal device 120,

[0210] When the second terminal device 120 has sidelink data to be transmitted to the first terminal device 110 and / or the third terminal device 130; or

[0211] Based on the pre-configured or configured requirement information of the sidelink data packet, a preferred or non-preferred resource set associated with the sidelink data packet may be determined.

[0212] Furthermore, the second terminal device 120 transmits 1120 the IUC-coex information to the first terminal device 110. In addition, the second terminal device 120 transmits 1130 the IUC-coex information to the third terminal device 130.

[0213] In some embodiments, the second terminal device 120 uses side link multicast or broadcast to send IUC-coex information. For example, when sending 120 and 130 are the same signaling, the second terminal device 120 sends 1120 IUC-coex information to the first terminal device 110 and sends 1130 IUC-coex information to the third terminal device 130, and sending 120 and 130 are the same signaling.

[0214] In some embodiments, the IUC-coex information may include at least one of the following:

[0215] a preferred set of resources within the first type of sidelink resources for transmission of first sidelink data,

[0216] a set of non-preferred resources within the first type of sidelink resources for transmission of the first sidelink data, or

[0217] • An indication of a potential conflict between first reserved resources within the first type of sidelink resources for transmission of the first sidelink data and second reserved resources for transmission of the third terminal device.

[0218] After receiving the IUC-coex information, the first terminal device 110 selects 1140 at least one PSSCH resource for sending first side link data based on the IUC-coex information.

[0219] The first terminal device 110 then sends 1150 first side link data to the second terminal device 120 on the selected at least one PSSCH resource.

[0220] In some embodiments, the first terminal device 110 sends the first sidelink data on the selected at least one PSSCH resource by using sidelink multicast or broadcast.

[0221] On the side of the third terminal device 130 , upon receiving the IUC-coex information, the third terminal device 130 selects 1160 at least one PSSCH resource for sending second side link data based on the IUC-coex information.

[0222] The third terminal device 130 then sends 1170 second side link data to the second terminal device 120 on the selected at least one PSSCH resource.

[0223] In some embodiments, the first terminal device 130 sends the second sidelink data on the selected at least one PSSCH resource by using sidelink multicast or broadcast.

[0224] As reference Fig.10 As described, in some embodiments, the IUC-coex information may include a preferred resource set for transmission of the first side link data within the first type of side link resources. In such an embodiment, the first terminal device 110 may send a request for auxiliary information by sending a first request for a preferred resource set for transmitting the first side link data. This will refer to Fig.12 Give a description.

[0225] Fig.12 A signaling diagram of a process 1200 for selecting at least one PSSCH resource according to some implementations of the present disclosure is shown. For the purpose of discussion, reference will be made to Figure 1 Process 1200 is described. Process 1200 may include the following: Figure 1 The first terminal device 110 and the second terminal device 120 are shown. Process 1200 can be considered as an example implementation of process 1000. Figure 1 The process 1200 is described in the communication network 100 of FIG. 1 , but the process can also be applied to other communication scenarios.

[0226] In process 1200, the first terminal device 110 and the second terminal device 120 are a sidelink unicast UE pair, that is, a PC5 RRC connection.

[0227] like Fig.12 As shown, the first terminal device 110 determines 1210 first side link data to be sent, which can use a first type of side link resource (e.g., a shared resource).

[0228] Furthermore, the first terminal device 110 sends 1220 a first request for a preferred resource set for sending the first side link data. The first request may include at least one of the following:

[0229] The priority of the first side link data,

[0230] The period of the first side link data,

[0231] a resource selection window for at least one PSSCH resource, or

[0232] • The number of sub-channels or resource blocks to be selected for transmission of the first sidelink data.

[0233] In some embodiments, the first terminal device 110 may send a first request for a preferred set of resources in a MAC CE.

[0234] In some embodiments, the first terminal device 110 may determine the resource selection window based on the subcarrier spacing of the first type of side link resources.

[0235] In some embodiments, the first terminal device 110 may determine the number of subchannels or resource blocks based on the configuration of the first type of side link resources.

[0236] After receiving the first request for the preferred resource set, the second terminal device 120 determines 1230 the preferred resource set within the shared resource according to the first request. Figure 8 and Fig. 9 The preferred set of resources is determined by its NR side link module, as done by the NR side link module 112 in .

[0237] Then, the second terminal device 120 sends 1240 the preferred resource set to the first terminal device 110 .

[0238] After receiving the preferred resource set, the first terminal device 110 selects 1250 at least one PSSCH resource within the preferred resource set for sending first side link data.

[0239] The first terminal device 110 then sends 1260 first side link data to the second terminal device 120 on the selected at least one PSSCH resource.

[0240] The process 1200 provides a more appropriate preferred resource set for the Type B UE according to the requirements of the Type B UE.

[0241] As reference Fig.10 As described, in some embodiments, the IUC-coex information may include a set of non-preferred resources for transmission of the first side link data within the first type of side link resources. In such an embodiment, the first terminal device 110 may send a request for auxiliary information by sending a second request for a set of non-preferred resources for transmitting the first side link data. This will refer to Fig.13 Give a description.

[0242] Fig.13 A signaling diagram of a process 1300 for selecting at least one PSSCH resource according to some implementations of the present disclosure is shown. For the purpose of discussion, reference will be made to Figure 1 Process 1300 is described. Process 1300 may include the following: Figure 1 The first terminal device 110 and the second terminal device 120 are shown. Process 1300 can be considered as another example implementation of process 1000. Figure 1 The process 1300 is described in the communication network 100 of FIG. 1 , but the process can also be applied to other communication scenarios.

[0243] In the process 1300, the second terminal device 120 is a destination terminal device of a TB (data packet) to be transmitted by the first terminal device 110, or the second terminal device 120 receives an SCI of the first terminal device 110, which reserves resources within the shared resources.

[0244] like Fig.13 As shown, the first terminal device 110 determines 1310 first side link data to be sent, which can use a first type of side link resource (e.g., a shared resource).

[0245] The first terminal device 110 sends 1320 a second request for a set of non-preferred resources for sending the first side link data. For example, the first terminal device 110 may send the second request in an SCI. The SCI may indicate reserved resources in the shared resources.

[0246] After receiving the second request for the non-preferred resource set, the second terminal device 120 determines 1330 the non-preferred resource set. The non-preferred resource set includes one or more resources within the shared resource. For example, the non-preferred resource set may include at least one of the following:

[0247] The second terminal device 120 does not receive resources on a time slot or subframe of the side link signal,

[0248] a first reserved resource for transmission of the first sidelink data, the first reserved resource conflicting with a second reserved resource for transmission of the third terminal device, or

[0249] resources whose RSRP exceeds the RSRP threshold for sidelink resources of the first type,

[0250] - Where RSRP exceeds the RSRP threshold, at least one of the following is included:

[0251] RSRP is equal to or higher than a first RSRP threshold;

[0252] The second terminal device 120 is a target receiving device of the first side link data, and the RSRP is equal to or lower than another RSRP threshold.

[0253] On the first terminal device 110 side, the first terminal device 110 performs 1340 an NR mode 2 sensing and resource selection process to determine a second set of candidate resources on the NR side link dedicated resources.

[0254] After determining the non-preferred resource set, the second terminal device 120 sends 1350 the non-preferred resource set to the first terminal device 110 .

[0255] After receiving the non-preferred resource set, the first terminal device 110 selects 1360 at least one PSSCH resource for sending the first side link data by considering the non-preferred resource set and the second candidate resource set.

[0256] The first terminal device 110 then sends 1370 first side link data to the second terminal device 120 on the selected at least one PSSCH resource.

[0257] As reference Fig.10 As described, in some embodiments, the IUC-coex information may include an indication of a potential conflict between a first reserved resource for transmission of the first side link data within the first type of side link resources and a second reserved resource for transmission of the third terminal device. In such an embodiment, the first terminal device 110 may send a request for auxiliary information by sending a third request for an indication of the potential conflict. This will refer to Fig.14 Give a description.

[0258] Fig.14 A signaling diagram of a process 1400 for selecting at least one PSSCH resource according to some implementations of the present disclosure is shown. For the purpose of discussion, reference will be made to Figure 1 Process 1400 is described. Process 1400 may include the following: Figure 1The first terminal device 110, the second terminal device 120, and the third terminal device 130 are shown. Process 1400 can be considered as an example implementation of process 1100. Figure 1 The process 1400 is described in the communication network 100 of FIG. 1 , but the process can also be applied to other communication scenarios.

[0259] In the process 1400, each of the first terminal device 110 and the third terminal device 130 may be a type A UE or a type B UE. In this regard, the first terminal device 110 and the third terminal device 130 are also referred to as UE 110 and UE 130, respectively. In addition, the second terminal device 120 may be a type A UE. In this regard, the second terminal device 120 is referred to as type A UE 120. In addition, the third terminal device 130 may be a device having only an LTE sidelink module, for example, an LTE UE with a sidelink function.

[0260] like Fig.14 As shown, the first terminal device 110 sends 1410 a first SCI to the second terminal device 120. The first SCI indicates a first reserved resource in the shared resource. The first reserved resource can be used for transmission of the first side link data. The first SCI also indicates a third request for an indication of a potential conflict.

[0261] Similarly, the third terminal device 130 sends 1420 a second SCI to the second terminal device 120. The second SCI indicates a second reserved resource in the shared resource. The second reserved resource can be used for transmission of the second side link data.

[0262] It should be understood that although actions 1410 and 1420 are shown sequentially, in some embodiments, actions 1410 and 1420 may be performed in parallel. Alternatively, action 1420 may be performed before action 1410.

[0263] On the side of the second terminal device 120, the second terminal device 120 receives 1430 the first SCI and the second SCI and detects a potential conflict between the first reserved resources and the second reserved resources.

[0264] When the second terminal device 120 determines that at least one predetermined condition is met, the second terminal device 120 sends the IUC-coex information to at least one of the first terminal device 110 and the third terminal device 130. The IUC-coex information includes an indication of a potential conflict. In some embodiments, the second terminal device 120 sends the IUC-coex information to a terminal device with a lower priority in the relevant SCI. For example, if the priority in the first SCI sent by the first terminal device 110 is lower than the priority in the second SCI sent by the third terminal device 130, the second terminal device 120 sends 1440 the IUC-coex information to the first terminal device 110.

[0265] After receiving the IUC-coex information including the indication of the potential conflict, the first terminal device 110 reselects 1450 resources for sending the first side link data according to the indication of the potential conflict.

[0266] The first terminal device 110 then sends 1460 the first side link data to the second terminal device 120 on the reselected resources.

[0267] On the side of the third terminal device 130 , since the third terminal device 130 does not receive an indication of a potential conflict, the third terminal device 130 sends 1470 second side link data to the second terminal device 120 on the second reserved resources.

[0268] Fig.15 1500 is a flowchart of an example method according to some embodiments of the present disclosure. In some embodiments, method 1500 may be implemented at a terminal device, for example Figure 1 For the purpose of discussion, reference will be made to the first terminal device 110, the second terminal device 120, and the third terminal device 130. Figure 1 to describe method 1500 without loss of generality.

[0269] In block 1510 , the second terminal device 120 determines auxiliary information.

[0270] At block 1520, the second terminal device 120 sends auxiliary information to the first terminal device 110 for determination of a first set of candidate resources. The first set of candidate resources includes at least one candidate resource, and each candidate resource is included in a first type of side link resource, and the first type of side link resource can be used for both a first side link associated with the first RAT and a second side link associated with the second RAT.

[0271] In some embodiments, the second terminal device 120 includes a first module for a first side link and a second module for a second side link.

[0272] In some embodiments, the auxiliary information includes at least one of the following:

[0273] a preferred resource set within the first type of side link resources, the preferred resource set being used for transmission of first side link data by the first terminal device 110,

[0274] a set of non-preferred resources within the first type of sidelink resources for transmission of the first sidelink data, or

[0275] • An indication of a potential conflict between first reserved resources within the first type of sidelink resources for transmission of the first sidelink data and second reserved resources for transmission of the third terminal device.

[0276] In some embodiments, the method 1500 further comprises: receiving a request for auxiliary information from the first terminal device 110. In such an embodiment, sending the auxiliary information comprises: sending a response to the request, the response comprising the auxiliary information.

[0277] In some embodiments, receiving a request for assistance information includes: receiving a first request for a preferred set of resources for transmission of first sidelink data. The first request includes at least one of:

[0278] The priority of the first side link data,

[0279] The period of the first side link data,

[0280] a resource selection window for at least one PSSCH resource, or

[0281] • The number of sub-channels or resource blocks to be selected for transmission of the first sidelink data.

[0282] In some embodiments, the resource selection window is determined based on the subcarrier spacing of the first type of sidelink resources.

[0283] In some embodiments, the number of subchannels or resource blocks is determined based on the configuration of the first type of sidelink resources.

[0284] In some embodiments, receiving the request for assistance information comprises receiving a second request for a set of non-preferred resources within the first type of sidelink resources for transmission of the first sidelink data.

[0285] In some embodiments, the response includes a set of non-preferred resources, and the set of non-preferred resources includes at least one of the following:

[0286] The second terminal device 120 does not receive resources on the time slot or subframe of the side link signal,

[0287] a first reserved resource for transmission of the first sidelink data, the first reserved resource conflicting with a second reserved resource for transmission of the third terminal device, or

[0288] • Resources whose reference signal received power (RSRP) exceeds an RSRP threshold for sidelink resources of the first type.

[0289] In some embodiments, sending the auxiliary information comprises sending the auxiliary information if at least one predefined condition is met.

[0290] Fig.16 is a simplified block diagram of a device 1600 suitable for implementing some embodiments of the present disclosure. Device 1600 can be considered as Figure 1 Another example embodiment of one of the terminal devices 110, 120 and 130 or one of the network devices 140 and 150 is shown. Therefore, the device 1600 can be implemented at or as at least a part of one of the terminal devices 110, 120 and 130 or one of the network devices 140 and 150.

[0291] As shown, the device 1600 includes a processor 1610, a memory 1620 coupled to the processor 1610, a suitable transmitter (TX) and receiver (RX) 1640 coupled to the processor 1610, and a communication interface coupled to the TX / RX 1640. The memory 1620 stores at least a portion of the program 1630. The TX / RX 1640 is used for bidirectional communication. The TX / RX 1640 has at least one antenna to facilitate communication, although in practice the access node mentioned in this application may have several antennas. The communication interface may represent any interface required for communication with other network elements, such as an X2 interface for bidirectional communication between gNBs or eNBs, an S1 interface for communication between a mobility management entity (MME) / serving gateway (S-GW) and a gNB or eNB, a Un interface for communication between a gNB or eNB and a relay node (RN), or a Uu interface for communication between a gNB or eNB and a terminal device.

[0292] Program 1630 is assumed to include program instructions that, when executed by associated processor 1610, enable device 1600 to operate in accordance with embodiments of the present disclosure, as described herein. Figures 1 to 15 The embodiments herein may be implemented by computer software executable by a processor 1610 of the device 1600, or by hardware, or by a combination of software and hardware. The processor 1610 may be configured to implement various embodiments of the present invention. In addition, the combination of the processor 1610 and the memory 1620 may form a processing device 1650 suitable for implementing various embodiments of the present disclosure.

[0293] The memory 1620 may be of any type suitable for the local technology network and may be implemented using any suitable data storage technology, such as, as non-limiting examples, non-transitory computer-readable storage media, semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory, and removable memory. Although only one memory 1620 is shown in the device 1600, there may be several physically distinct memory modules in the device 1600. As non-limiting examples, the processor 1610 may be of any type suitable for the local technology network and 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. The device 1600 may have multiple processors, such as dedicated integrated circuit chips that are time-slaved to a clock that synchronizes a master processor.

[0294] The components included in the apparatus and / or device of the present disclosure may be implemented in various ways, including software, hardware, firmware, or any combination thereof. In one embodiment, one or more units may be implemented using software and / or firmware of machine executable instructions, such as those stored on a storage medium. In addition to or in place of machine executable instructions, some or all units in the apparatus and / or device may be implemented at least in part by one or more hardware logic components. For example, but not limited to, illustrative types of hardware logic components that may be used include field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system on chip systems (SOCs), complex programmable logic devices (CPLDs), and the like.

Claims

1. A method for sidelink communication, comprising: selecting, at a first terminal device, at least one physical sidelink shared channel (PSSCH) resource, wherein each of the at least one PSSCH resource is within a first type of sidelink resource or a second type of sidelink resource, and the first type of sidelink resource is usable for both a first sidelink associated with a first radio access technology (RAT) and a second sidelink associated with a second RAT, and the second type of sidelink resource is usable for the second sidelink; as well as First sidelink data is sent on the at least one PSSCH resource.

2. The method of claim 1, wherein the at least one PSSCH resource is selected based on a configuration or pre-configuration of the first type of side link resources.

3. The method of claim 2, wherein the configuration or pre-configuration of the first type of side link resources comprises: a first indication, indicating whether all resources in the side link resource pool are side link resources of the first type, or The second indication indicates whether the first terminal device is capable of selecting the at least one PSSCH resource within the first type of side link resources.

4. The method according to claim 2, wherein the configuration or pre-configuration of the first type of side link resources comprises at least one of the following: a first channel busy rate (CBR) threshold of a first side link resource pool for said first side link, a first channel occupancy rate (CR) threshold for the first side link resource pool, a second CBR threshold of a second side link resource pool for said second side link, or A second CR threshold for the second side link resource pool.

5. The method according to claim 4, wherein: Based on determining that the CBR of the first side link resource pool is equal to or higher than the first CBR threshold, the first terminal device cannot select the at least one PSSCH resource within the first type of side link resources; Based on determining that the CBR of the first side link resource pool is equal to or lower than the first CBR threshold, the first terminal device is capable of selecting the at least one PSSCH resource within the first type of side link resources; Based on determining that the CR of the first side link resource pool is equal to or higher than the first CR threshold, the first terminal device cannot select the at least one PSSCH resource within the first type of side link resources; Based on determining that the CR of the first side link resource pool is equal to or lower than the first CR threshold, the first terminal device is capable of selecting the at least one PSSCH resource within the first type of side link resources; Based on determining that the CBR of the second side link resource pool is equal to or higher than the second CBR threshold, the first terminal device is capable of selecting the at least one PSSCH resource within the first type of side link resources; Based on determining that the CBR of the second side link resource pool is equal to or lower than the second CBR threshold, the first terminal device cannot select the at least one PSSCH resource within the first type of side link resources; Based on determining that the CR of the second side link resource pool is equal to or higher than the second CR threshold, the first terminal device is capable of selecting the at least one PSSCH resource within the first type of side link resources; or Based on determining that the CR of the second side link resource pool is equal to or lower than the second CR threshold, the first terminal device cannot select the at least one PSSCH resource within the first type of side link resources.

6. The method of claim 2, wherein the configuration or pre-configuration of the first type of side link resources comprises a priority threshold; in: The first terminal device is capable of selecting the at least one PSSCH resource within the first type of sidelink resources based on determining that the first priority of the first sidelink data is equal to or higher than the priority threshold; or Based on determining that the first priority of the first sidelink data is equal to or lower than the priority threshold, the first terminal device can select the at least one PSSCH resource within the first type of sidelink resources.

7. The method of claim 1 , wherein selecting the at least one PSSCH resource comprises: Determining a set of candidate resources based on the auxiliary information; as well as The at least one PSSCH resource is selected within the set of candidate resources.

8. The method according to claim 7, wherein the candidate resource set comprises at least one of the following: a first set of candidate resources, wherein at least one candidate resource is included in the first set of candidate resources, and each of the at least one candidate resource included in the first set of candidate resources is included in the side link resource of the first type, or A second set of candidate resources, wherein at least one candidate resource is included in the second set of candidate resources, and each of the at least one candidate resource included in the second set of candidate resources is included within the second type of side link resources.

9. The method of claim 8, wherein the first terminal device comprises a first module of the first side link and a second module of the second side link.

10. The method of claim 9, wherein determining the auxiliary information comprises: providing, from the second module to the first module, a request for the auxiliary information; as well as The auxiliary information is obtained from the first module at the second module.

11. The method according to claim 10, wherein: Providing the request for the auxiliary information includes: providing, from the second module to the first module, requirement information regarding the first sidelink data; and The method further comprises: The first module determines, based on the demand information, the first set of candidate resources within the first type of side link resources; and Acquiring the auxiliary information includes acquiring the first candidate resource set from the first module.

12. The method of claim 11, wherein determining the first set of candidate resources within the first type of side link resources comprises: Resources not included in the first type of side link resources are excluded from an initial set of candidate resources in the first side link resource pool.

13. The method according to claim 10, wherein determining the candidate resource set comprises: The second module determines the candidate resource set by combining the first candidate resource set and the second candidate resource set.

14. The method according to claim 8, further comprising: The auxiliary information is received from the second terminal device.

15. The method according to claim 14, wherein the auxiliary information comprises at least one of the following: a preferred set of resources within said first type of sidelink resources for said transmission of said first sidelink data, a set of non-preferred resources within the first type of sidelink resources for the transmission of the first sidelink data, or An indication of a potential conflict between first reserved resources for transmission of the first sidelink data and second reserved resources for transmission of a third terminal device within the first type of sidelink resources.

16. The method according to claim 14, further comprising: Sending a request for the auxiliary information to the second terminal device; as well as The receiving of the auxiliary information comprises: A response to the request is received, the response including the auxiliary information.

17. The method of claim 16, wherein sending the request for the assistance information comprises: sending a first request for a preferred set of resources for the transmission of the first sidelink data, the first request comprising at least one of: the priority of the first side link data, a period of the first side link data, a resource selection window for the at least one PSSCH resource, or The number of sub-channels or resource blocks to be selected for the transmission of the first sidelink data.

18. The method according to claim 17, further comprising: determining the resource selection window based on the subcarrier spacing of the first type of sidelink resources; and / or The number of subchannels or resource blocks is determined based on a configuration of the first type of sidelink resources.

19. A method for sidelink communication, comprising: determining auxiliary information at the second terminal device; as well as The auxiliary information is sent to a first terminal device for determining a first set of candidate resources, wherein the first set of candidate resources includes at least one candidate resource, and each of the candidate resources is included in a first type of side link resource, and the first type of side link resource can be used for both a first side link associated with a first radio access technology (RAT) and a second side link associated with a second RAT.

20. A terminal device, comprising: processor; as well as A memory is coupled to the processor and has instructions stored thereon, which, when executed by the processor, cause the terminal device to perform the method according to any one of claims 1 to 18 or claim 19.

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