NR sidelink resource selection based on LTE sidelink information

Abstract

A user equipment (UE) is configured to communicate with other UEs via a legacy sidelink (SL) connection and a non-legacy SL connection. The UE is further configured to: receive legacy SL resource information associated with legacy resources in a legacy resource pool for legacy SL transmission to be performed by the UE, wherein the legacy SL resource information includes a time location and a resource reservation period of the legacy resources; and excluding non-legacy resources in a non-legacy SL resource pool for transmitting non-legacy SL transmissions based on at least legacy resource information.

Description

Technical Field

[0001] The present disclosure relates generally to wireless communications, and in particular to NR sidelink resource selection based on LTE sidelink information. Background Art

[0002] A user equipment (UE) can be configured with multiple communication links. For example, a UE can receive signals from cells of a corresponding network via downlinks and transmit signals to cells of the corresponding network via uplinks. A UE can also be configured to communicate with other UEs via sidelinks (SLs). The term "sidelink" refers to a communication link that can be used for device-to-device (D2D) communication. Thus, an SL facilitates communication between a UE and another UE without using a cell.

[0003] With the evolution of radio access technologies (RATs), UEs may be able to communicate using protocols from multiple different RATs, such as Long Term Evolution (LTE) and 5G New Radio (NR). Both RATs support SL communications, but in different ways. Therefore, co-channel coexistence schemes should be defined to allow UEs to perform simultaneous 5G and LTE SL transmissions. Summary of the Invention

[0004] Some example embodiments relate to a method performed by a user equipment (UE) configured to communicate with other UEs via a legacy sidelink (SL) connection and a non-legacy SL connection. The method includes: receiving legacy SL resource information associated with legacy resources in a legacy resource pool for a legacy SL transmission to be performed by the UE, wherein the legacy SL resource information includes a time location and a resource reservation period of the legacy resources; and excluding non-legacy resources in a non-legacy SL resource pool for transmitting the non-legacy SL transmission based on at least the legacy resource information.

[0005] Other exemplary embodiments relate to a method performed by a user equipment (UE) configured to communicate with other UEs via a legacy sidelink (SL) connection and a non-legacy SL connection. The method includes receiving legacy SL resource information associated with legacy resources for legacy SL transmissions in a legacy resource pool, and excluding non-legacy resources in the non-legacy SL resource pool for transmitting the non-legacy SL transmission based on at least the legacy resource information. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 Exemplary network arrangements are shown according to various exemplary embodiments.

[0007] Figure 2 An exemplary UE according to various exemplary embodiments is shown.

[0008] Figure 3 Exemplary methods for performing sidelink resource selection operations according to various exemplary embodiments are shown.

[0009] Figure 4 A timing diagram is illustrated for performing resource exclusion based on information related to LTE sidelink transmissions of a UE according to various exemplary embodiments.

[0010] Figure 5 A timing diagram illustrating exemplary resource exclusion operations based on unmonitored LTE sidelink transmissions according to various exemplary embodiments is illustrated.

[0011] Figure 6 A timing diagram illustrating exemplary resource exclusion operations when the subcarrier spacing (SCS) of the NR sidelink is higher than the SCS of the LTE sidelink according to various exemplary embodiments is illustrated.

[0012] Figure 7a shows a timing diagram of a first exemplary manner of using multi-slot transmission when the SCS of the NR side link is higher than the SCS of the LTE side link according to various exemplary embodiments.

[0013] Figure 7b shows a timing diagram of a second exemplary manner of using multi-slot transmission when the SCS of the NR side link is higher than the SCS of the LTE side link according to various exemplary embodiments. DETAILED DESCRIPTION

[0014] The exemplary embodiments may be further understood with reference to the following description and associated drawings, wherein like elements are provided with like reference numerals. These exemplary embodiments relate to a user equipment (UE) selecting a non-legacy (e.g., 5G New Radio (NR)) sidelink (SL) resource based on at least information shared by a legacy (e.g., Long Term Evolution (LTE)) sidelink module, the information being related to LTE SL transmissions by the UE or other UEs.

[0015] The exemplary embodiments are described with reference to a UE. However, reference to a UE is provided for illustrative purposes only. The exemplary embodiments may be used with any electronic component that can establish a connection with a network and is configured with hardware, software, and / or firmware for exchanging information and data with the network. Therefore, as used herein, a UE is intended to represent any suitable type of electronic component.

[0016] Example embodiments are also described with reference to a sidelink (SL). The term "sidelink" generally refers to a communication link between a UE and another UE. The SL provides direct device-to-device (D2D) communication, wherein information and / or data exchanged between the UE and the other UE via the sidelink does not pass through a cell. In some configurations, a single sidelink provides bidirectional data communication between the UE and the other UE. In other configurations, a single sidelink provides unidirectional data communication between the UE and the other UE, but signaling may be sent in both directions. The term "unicast" refers to one-to-one (i.e., D2D) device communication and may generally refer to bidirectional communication or unidirectional communication. Various embodiments may apply to one or both forms of communication as indicated below.

[0017] In some exemplary embodiments, SL transmission may occur in an unlicensed spectrum. As used herein, unlicensed spectrum may include, but is not limited to, spectrum with contention-based spectrum access, such as listen-before-talk (LBT) operation.

[0018] Both the Long Term Evolution (LTE) and 5G New Radio (NR) standards support SL communication. In some configurations, the network may provide the UE with information indicating how to establish, maintain, and / or utilize a SL connection. Thus, while information and / or data exchanged via the SL does not traverse a cell, the UE and the network can exchange SL-related information. In other configurations, the SL connection is not controlled by the network. In either configuration, the first and second UEs can still perform synchronization and discovery procedures and exchange control information corresponding to the SL connection.

[0019] In NR sidelink transmission, two resource allocation scheme modes are supported for vehicle-to-everything (V2X) data packet transmission. In the first mode (Mode 1), the base station (gNB) schedules sidelink resources, requiring the UE to obtain resource information from the gNB each time it initiates V2X communication via the SL. The second mode is performed autonomously by the UE. For example, in the second mode (Mode 2) resource allocation scheme, the transmitting (Tx) UE selects SL transmission resources based on its own sensing and resource selection process, without any information from the receiving (Rx) UE. In exemplary embodiments, the second resource allocation mode may be used. Furthermore, in NR V2X, the resource selection process may perform a series of operations to identify candidate resources. These operations are described in more detail below.

[0020] While the exemplary embodiments are described with reference to V2X, LTE, and 5G, it should be understood that the exemplary embodiments are not limited to these examples. For example, the exemplary embodiments may be applied to any SL transmission, not just V2X SL transmission. In other examples, the principles described herein for selecting NR SL resources using LTE SL information may also be applied to selecting SL resources for non-legacy protocols using SL information from any legacy protocol. That is, throughout this description, the term LTE may be considered to refer to any legacy protocol, while the term NR may be considered to refer to any non-legacy protocol. As cellular communications evolve, NR may become a legacy protocol, while newly introduced sixth-generation (6G) protocols may be non-legacy protocols. Therefore, when performing 6G SL communications, the 6G sidelink module may obtain information from legacy sidelink modules (e.g., LTE and 5G) for use in selecting SL resources.

[0021] An exemplary embodiment involves the NR SL module obtaining additional SL information from the LTE SL module when performing a resource selection process. The LTE side link and the NR side link may share the same time and frequency resources in a dynamic resource pool. Therefore, in an exemplary embodiment, a mechanism may be defined for co-channel coexistence between the LTE side link and the NR side link, enabling the two channels to adapt to the dynamic resource pool sharing between the LTE side link and the NR side link. Therefore, the LTE side link module of the LTE side link may share candidate information with the NR side link module to prevent the LTE side link and the NR side link from using the same frequency and time resources in the same resource pool. Accordingly, the NR side link module may use the information shared from the LTE side link module to select resources that can be used for transmission.

[0022] The exemplary embodiment introduces a technique for performing resource exclusion based on information shared by the LTE side link module to the NR side link module. In one example, the UE may be configured to perform the resource exclusion technique based on the UE's own LTE side link transmission. In another example, the UE may be configured to perform the resource exclusion technique based on unmonitored LTE side link transmission. In a further example, the UE may be configured to perform the resource exclusion technique by processing logical subframes or time slots from the LTE and NR side links. In another example, the UE may be configured to perform the resource exclusion technique by processing the higher SCS of the NR side link based on the information shared by the LTE side link module. The exemplary techniques described herein may be used in conjunction with currently implemented techniques related to NR side link transmission, in conjunction with future implemented techniques related to NR side link transmission, or independently of other techniques related to NR side link transmission.

[0023] Figure 1An exemplary network arrangement 100 according to various exemplary embodiments is shown. The exemplary network arrangement 100 includes UEs 110, 112. Those skilled in the art will appreciate that the UEs 110, 112 may be any type of electronic component configured to communicate via a network, such as, for example, a component of a connected car, a mobile phone, a tablet computer, a smartphone, a phablet, an embedded device, a wearable device, an Internet of Things (IoT) device, or the like.

[0024] Throughout this specification, the terms "UE 110," "UE," and "transmitting device" are used interchangeably. Furthermore, the terms "UE 112," "additional UE," and "receiving device" are also used interchangeably. It should also be understood that an actual network deployment may include any number of UEs used by any number of users. Therefore, the example of two UEs 110 and 112 is provided for illustrative purposes only.

[0025] UEs 110 and 112 may communicate directly with one or more networks. In the example of network configuration 100, the networks with which UEs 110 and 112 may wirelessly communicate are a 5G NR radio access network (5G NR-RAN) 120, an LTE radio access network (LTE-RAN) 122, and a wireless local area network (WLAN) 124. These types of networks support vehicle-to-everything (V2X) and / or sidelink communications. In the exemplary network arrangement 100, UEs 110 and 112 may be connected via a sidelink. However, UE 110 may also communicate with other types of networks, and UE 110 may also communicate with a network via a wired connection. Thus, UEs 110 and 112 may include a 5G NR chipset for communicating with 5G NR-RAN 120, an LTE chipset for communicating with LTE-RAN 122, and an ISM chipset for communicating with WLAN 124.

[0026] 5G NR-RAN 120 and LTE-RAN 122 may be part of cellular networks that may be deployed by cellular providers (e.g., Verizon, AT&T, T-Mobile, etc.). These networks 120, 122 may include, for example, cells or base stations (NodeB, eNodeB, HeNB, eNB, gNB, gNodeB, macrocell, microcell, small cell, femtocell, etc.) configured to transmit and receive traffic from UEs equipped with appropriate cellular chipsets. WLAN 124 may include any type of wireless local area network (WiFi, hotspot, IEEE 802.11x network, etc.).

[0027] UEs 110 and 112 may connect to the 5G NR-RAN via gNB 120A. Reference to a single gNB 120A is for illustrative purposes only. The exemplary embodiments are applicable to any suitable number of gNBs. UEs 110 and 112 may also connect to LTE-RAN 122 via eNB 122A.

[0028] Those skilled in the art will appreciate that any association procedure may be performed for UE 110, 112 to connect to 5G NR-RAN 120 and LTE-RAN 122. For example, as described above, 5G NR-RAN 120 and LTE-RAN 122 may be associated with a specific cellular provider with which UE 110, 112 and / or its user has a contract and credential information (e.g., stored on a SIM card). Upon detecting the presence of 5G NR-RAN 120, UE 110, 112 may send corresponding credential information to associate with 5G NR-RAN 120. More specifically, UE 110, 112 may associate with a specific base station (e.g., gNB 120A for 5G NR-RAN 120, eNB 122A for LTE-RAN 122).

[0029] UEs 110 and 112 can also communicate directly with each other using a sidelink. A sidelink is a direct device-to-device (D2D) communication link. Therefore, information and / or data sent directly to another endpoint (e.g., UE 110 or UE 112) does not pass through a cell (e.g., gNB 120A, eNB 122A). In some embodiments, UEs 110 and 112 may receive information from the cell regarding how to establish, maintain, and / or utilize the sidelink. Thus, the network (e.g., 5G NR-RAN 120, LTE-RAN 122) may control the sidelink. In other embodiments, UEs 110 and 112 may control the sidelink. Regardless of how the sidelink is controlled, UEs 110 and 112 may simultaneously maintain a downlink / uplink to the currently camped cell (e.g., gNB 120A, eNB 122A) and a sidelink to another UE.

[0030] In addition to networks 120, 122, and 124, network arrangement 100 also includes a cellular core network 130, the Internet 140, an IP Multimedia Subsystem (IMS) 150, and a network service backbone 160. Cellular core network 130 can be considered an interconnected collection of components that manage the operation and traffic of a cellular network (e.g., 5GC in NR). Cellular core network 130 also manages traffic flowing between the cellular network and the Internet 140.

[0031] IMS 150 can be generally described as an architecture for delivering multimedia services to UE 110 using IP protocols. IMS 150 can communicate with cellular core network 130 and the Internet 140 to provide multimedia services to UE 110. Network service backbone 160 communicates directly or indirectly with the Internet 140 and cellular core network 130. Network service backbone 160 can be generally described as a collection of components (e.g., servers, network storage arrangements, etc.) that implement a set of services that can be used to extend the functionality of UE 110 to communicate with various networks.

[0032] Figure 2 An exemplary UE 110 is shown according to various exemplary embodiments. Figure 1 100 is used to describe the UE 110. The UE 110 may include a processor 205, a memory arrangement 210, a display device 215, an input / output (I / O) device 220, a transceiver 225, and other components 230. The other components 230 may include, for example, a SIM card, an embedded SIM (eSIM), an audio input device, an audio output device, a power supply, a data acquisition device, a port for electrically connecting the UE 110 to other electronic devices, and the like. Figure 2 The UE 110 illustrated in FIG may also represent the UE 112 .

[0033] The processor 205 may be configured to execute multiple engines of the UE 110. For example, the engines may include an LTE sidelink module 235 and a 5G NR sidelink module 240. As will be described below, the LTE sidelink module 235 may be operable to share information with the NR sidelink module 240. The 5G NR sidelink module 240 may perform resource exclusion based on the information shared by the LTE sidelink module 235. These operations will be described in more detail below.

[0034] The description of each of the engines as an application (e.g., a program) executed by processor 205 is merely exemplary. The functionality associated with the engine may also be represented as a separate integrated component of UE 110, or may be a modular component coupled to UE 110, such as an integrated circuit with or without firmware. For example, the integrated circuit may include input circuitry for receiving signals and processing circuitry for processing signals and other information. The engine may also be embodied as an application or a separate application. Furthermore, in some UEs, the functionality described with respect to processor 205 is split between two or more processors, such as a baseband processor and an application processor. The exemplary embodiments may be implemented in any of these or other configurations of the UE.

[0035] The memory arrangement 210 may be a hardware component configured to store data related to operations performed by the UE 110. The display device 215 may be a hardware component configured to display data to a user, while the I / O device 220 may be a hardware component that enables a user to enter input. The display device 215 and the I / O device 220 may be separate components or may be integrated together (such as a touch screen). The transceiver 225 may be a hardware component configured to establish a connection with the 5G NR-RAN 120, WLAN 122, etc. Accordingly, the transceiver 225 may operate on multiple different frequencies or channels (e.g., a set of contiguous frequencies).

[0036] Figure 3 An exemplary method 300 for performing sidelink resource selection operations according to various exemplary embodiments is shown. Figure 1 The network arrangement 100 and Figure 2 UE 110 is described Figure 3 .

[0037] In 305, UE 110 may be configured to determine a resource selection window in the sidelink transmission based on the total number of candidate resources in the resource transmission. In an exemplary embodiment, the total number of candidate resources may be represented as S M .

[0038] In 310, UE 110 determines a sensing window and performs sensing within the sensing window to determine reserved resources.

[0039] In 315 , UE 110 may be configured to obtain an initial reference signal received power (RSRP) threshold based on the quality of service (QoS) of the sidelink data to be transmitted (eg, the quality of resources suitable for transmitting SL data).

[0040] In 320, UE 110 may be configured to set the initial candidate set S A Set to all resources in the sensing window identified by UE 110.

[0041] In 325, if the UE 110 is unable to monitor the resource during the sensing performed in the sensing window, the UE 110 may be configured to A In an exemplary embodiment, if UE 110 is unable to perform sensing in a time slot of the sensing time window, UE 110 may not be able to detect resource reservations within that time slot. Accordingly, UE 110 cannot determine whether there are resource reservations for that time slot and may be configured to exclude that time slot.

[0042] In 330, if the UE 110 determines that a candidate resource has been reserved by another UE and the RSRP is greater than a previously defined threshold, the UE 110 may be configured to exclude the candidate resource from S A .

[0043] In 335, if the UE 110 determines that the number of resources in S A is less than the total number of candidate resources (X * M 总 ), the UE 110 may be configured to increase the RSRP threshold in 345 and return to 320. It should be understood that the value of X * M 总 is a certain percentage of the total number of resources. For example, M 总 is the total number of resources, and X is a value where 0 < X < ˌ1. The threshold may be pre-configured or set based on any relevant factors.

[0044] Otherwise, in 340, the UE 110 may be configured to report the candidate resources in S A to a higher physical layer.

[0045] As described above, when a UE is capable of performing both non legacy (e.g., NR) and legacy (e.g., LTE) sidelink communications, the legacy and non legacy sidelink communications may share a dynamic resource pool. Thus, in an exemplary embodiment, the UE may perform an exclusion operation (e.g., 325, 330) at least in part based on information obtained by the non legacy sidelink module from the UE's legacy sidelink module. The manner in which the legacy sidelink module shares information and the type of information shared by the legacy sidelink module will be described in further detail by way of example below.

[0046] Figure 4 Illustrates a timing diagram 400 for performing resource exclusion based on information related to LTE sidelink transmission of UE 110 according to various exemplary embodiments. Will be described with reference to Figure 1 's network arrangement 100, Figure 2 's UE 110, and Figure 3 's method. Figure 4 . In Figure 4 's example, the x-axis is the time domain, but the y-axis is not the frequency domain. For example, although resources 420, 430, 435 are shown above resources 440, 450, 455, it is not required that resources 420, 430, 435 have a different frequency from resources 440, 450, 455.

[0047] In Figure 4In the example of FIG. 5 , the UE 110 may be configured to operate autonomously during NR sidelink operation to exclude resources based on information related to LTE sidelink transmissions performed by the UE 110, e.g., the LTE sidelink transmissions and the NR sidelink transmissions are to be performed by the same UE 110. Thus, the LTE sidelink module 235 of the UE 110 would share information with the NR sidelink module 240 of the UE 110, which the NR sidelink module 240 may then use when performing the exclusion operation.

[0048] Initially, information related to LTE sidelink transmission resources may include resources that have been reserved and / or selected by UE 110. In an exemplary embodiment, selected resources may be considered to be resources on which UE 110 intends to transmit SL data, while reserved resources may be resources that UE 110 reserves for subsequent SL transmissions, but which transmissions may or may not be performed, such as retransmissions. In some exemplary embodiments, LTE sidelink module 235 may share information about both reserved resources and selected resources. In some exemplary embodiments, LTE sidelink module 235 may only share information about reserved resources.

[0049] In some exemplary embodiments, the information shared by LTE sidelink module 235 and NR sidelink module 240 may include the time location and resource reservation period of resources used for LTE SL communication. In these exemplary embodiments, LTE sidelink module 235 may omit reporting the frequency location of the resources. This is because UE 110 may be configured to perform only LTE SL transmissions or NR SL transmissions in a particular subframe. Therefore, once NR sidelink module 240 knows that an LTE SL transmission will occur on a particular resource (in time), regardless of its location in the frequency domain, that resource may be excluded from the NR resource set.

[0050] In addition, the information may also include C resel , which is any periodic extension of the LTE sidelink resources. This information informs the NR sidelink module 240 of the number of resources that the LTE sidelink module 235 will then select.

[0051] To provide an example of the exclusion operation based on the above exemplary embodiment, Figure 4 4, it can be considered that there is an NR resource selection window 410. LTE sidelink module 235 can report the time location and resource reservation period of the resources for LTE SL communication of UE 110 to NR sidelink module 240. As described above, this information can be for reserved resources and selected resources, or only for reserved resources. In this example, the time location of the first LTE SL resource 420 can be reported to NR sidelink module 240, along with Figure 4 The resource reservation period 425 and C reselThe value is 2. Therefore, the NR sidelink module 240 will understand that the LTE SL resources 430 and 435 fall within the NR resource selection window 410. In this example, the time location of the second LTE SL resource 440 can be reported to the NR sidelink module 240, along with the resource reservation period and C resel Value 2, such as Figure 4 445 as illustrated in FIG. Therefore, the NR sidelink module 240 will understand that the LTE SL resources 450 and 455 also fall within the NR resource selection window 410. For this example, the priority of the LTE SL resources can be ignored, as priority will be described in more detail below (e.g., in this example, priority information is not used for exclusion operations).

[0052] As described above, this information about LTE SL resources can be used by the NR sidelink module 240 when performing the resource selection process, particularly when excluding certain resources from candidate resources for NR SL transmission. The details of how the NR sidelink module 240 may perform this exclusion based on LTE SL resource information in the context of method 300 will be described in greater detail below. In the example described above, the NR sidelink module 240 may exclude resources (e.g., subframes) corresponding to LTE SL resources 430, 435, 450, and 455 that fall within the NR resource selection window 410 from the candidate resources for NR SL transmission.

[0053] The above example can be summarized as an exclusion rule that stipulates that the NR sidelink module 240 always excludes resources in the time slot that overlap in time with LTE sidelink resources, regardless of the priority of the LTE sidelink transmission and the NR sidelink transmission.

[0054] In other exemplary embodiments, the information shared by the LTE sidelink module 235 and the NR sidelink module 240 may include the time location of the resources, the resource reservation period, and the priority of the LTE SL communication. Similarly, the LTE sidelink module 235 may omit reporting the frequency location of the resources for the same reasons as described in the above example.

[0055] To provide an example of the exclusion operation based on the above exemplary embodiment, consider again Figure 4 . Figure 4 This has been described above and will not be repeated. It is only noted that the LTE SL resources 430 and 435 falling within the NR resource selection window 410 have high priority, while the LTE SL resources 450 and 455 falling within the NR resource selection window 410 have low priority.

[0056] In the example initially described above, when the NR side link module 240 performs an exclusion operation, resources (e.g., subframes) corresponding to the high priority LTE SL resources 430 and 435 may be excluded from the candidate resources for NR SL transmission, while the low priority LTE SL resources 450 and 455 may not be excluded from the candidate resources for NR SL transmission.

[0057] The above example can be summarized as an exclusion rule that stipulates that the NR sidelink module 240 excludes resources that temporally overlap with LTE sidelink resources in a time slot only when the NR sidelink data has a lower priority than the LTE sidelink data. That is, in the above example, given that high-priority LTE SL resources 430 and 435 are used for LTE SL data with a higher priority than NR SL data, the NR sidelink module 240 excludes these resources from candidate resources for NR SL transmission. On the other hand, given that low-priority LTE SL resources 450 and 455 are used for LTE SL data with a lower priority than NR SL data, the NR sidelink module 240 does not exclude these resources from candidate resources for NR SL transmission. In some exemplary embodiments, SL data (NR or LTE) may be tagged with a priority value, and the above-defined exclusion rule may be applied based on the corresponding priority value. In some exemplary embodiments, the lower the priority value, the higher the data priority.

[0058] In an exemplary embodiment, the NR sidelink module 240 may implement the above-described resource exclusion rules, for example, before 325, after 325, or immediately after 330 in method 300. After resource exclusion, for example, LTE SL resource exclusion and the exclusion described with reference to 325 and 330, the resource selection operation may continue to 335 to determine the set S A The remaining candidate single-slot resources R x,y Is the number less than X*M 总 As mentioned above, when S A Less than X*M 总 When , the NR side link module 240 can increase the RSRP value and set S A Initialized as the set of all candidate single-slot resources, as described in 320 of method 300 .

[0059] In some exemplary embodiments, the NR sidelink module 240 may exclude LTE SL resources one by one, rather than for the entire NR resource selection window 410. For example, the NR sidelink module 240 may apply one of the above rules to exclude LTE SL resources. However, the rule may be applied as each applicable LTE SL resource is encountered, for example, starting with the highest priority SL resource. Similarly, referring to Figure 4, the first highest priority LTE SL resource is LTE SL resource 430. Therefore, the NR sidelink module 240 applies the applicable exclusion rule to this LTE SL resource. In this example, it can be considered that the first exclusion rule is applied, for example, the NR sidelink module 240 excludes all LTE SL resources from the NR candidate SL resources. Therefore, the NR sidelink module 240 excludes LTE SL resource 430 from the NR candidate SL resources.

[0060] However, the NR sidelink module 240 does not proceed to the next LTE SL resource to see if that resource should be excluded, but instead proceeds to 335 to determine whether excluding the LTE SL resource 430 results in the set S A The remaining candidate single-slot resources R x,y The number is less than X*M 总 If S A Less than X*M 总 , the NR side link module 240 will reduce the RSRP value and return to 420 to restart the resource selection process with a higher RSRP value. A Not less than X*M 总 , the NR sidelink module 240 will determine whether the next highest priority LTE SL resource (e.g., Figure 4 LTE SL resources 435 in S A Less than X*M 总 Or until all LTE SL resources are processed.

[0061] The exclusion rules implemented by the NR sidelink module 240 and the order in which the exclusion rules are applied may be based on resource pool (pre-)configuration or UE implementation.

[0062] In some exemplary embodiments, LTE sidelink module 235 provides information to NR sidelink module 240 that a particular LTE SL resource is not being monitored. For example, LTE sidelink module 235 is unaware of any other UEs transmitting on the particular LTE SL resource. As described above, NR sidelink module 240 excludes the unmonitored resources in 325, but these are NR SL resources used by other UEs. An issue addressed in these exemplary embodiments is the handling of the unmonitored LTE SL resources by NR sidelink module 240 based on the information provided by LTE sidelink module 235.

[0063] In an exemplary embodiment, if the NR side link module 240 satisfies any of the following conditions, it can select from the set S A Exclude any candidate single-slot resource R x,y The first condition is that UE 110 cannot monitor subframes in the LTE sidelink. The second condition is the LTE side link parameters restrictRespurceReservationPeriod The allowed periodicity values ​​and the subframe The third condition is that if the set S A R in x,y The number is less than X*M 总 (as described in 320), UE 110 may set S A is initialized to the set of all candidate single-slot resources, as described at the beginning of 320. Therefore, once these conditions are met, UE 110 can select from the set S A Exclude any candidate single-slot resource R x,y .

[0064] Those skilled in the art will appreciate that these features can be implemented based on resource pool (pre-)configuration or UE 110. For example, if there is high-priority NR sidelink data to be transmitted, UE 110 may want to mark the unmonitored LTE sidelink as excluded to avoid any transmission conflicts between UE 110's NR sidelink data transmission and potential LTE sidelink transmissions of other UEs. Accordingly, this feature can be enabled based on the NR sidelink data priority. For example, for NR sidelink data with a priority above a certain threshold, this feature of UE 110 can be enabled. However, if the priority of the NR sidelink data is below the set threshold, this feature can be disabled.

[0065] Figure 5 A timing diagram 500 illustrating exemplary resource exclusion operations by processing logical subframes from LTE and NR sidelinks according to various exemplary embodiments is shown. Figure 1 Network layout 100, Figure 2 UE 110 and Figure 3 Method to describe Figure 5 .

[0066] exist Figure 5 In FIG, LTE side link resource pool resources and NR side link resource pool resources are shown as being in time slots 510-530. It should be understood that both LTE SL resources and NR SL resources may not include every subframe in a time slot. For example, in Figure 5 In the example, time slot 520 includes subframes that are not in the NR SL resource pool, and time slot 530 includes subframes that are not in the LTE SL resource pool. Figure 5 The representation is used for illustrative purposes only, and the length of a time slot and the number of subframes in a time slot are generally defined by standards (e.g., 3GPP standards for licensed bands and IEEE standards for unlicensed bands). However, exemplary embodiments are not limited by the length of a time slot or the number of subframes in a time slot.

[0067] UE 110 may process logical subframes or time slots by implementing various exemplary techniques. In some exemplary embodiments, UE 110 may decode sidelink control information (SCI) to logically process sidelink data in LTE and NR sidelinks. Those skilled in the art will appreciate that SCI includes information that allows the UE to receive sidelink communications. For example, if UE 110 is Decode SCI, where resource reservation periodicity is determined by Given, UE 110 may be configured to perform operations based on the resource reservation periodicity. For example, UE 110 may determine from information in the SCI that LTE SL subframe 540 exists and, as described above, that there is a resource reservation periodicity associated with LTE subframe 540. In exemplary operation, UE 110 may convert the periodicity of LTE resource reservation into an LTE sidelink logical subframe. For example, if subframe In the LTE sidelink resource pool, the subframe is considered as a periodic extension. Figure 5 540 to subframe 550. In this example, subframe 550 is in the LTE SL resource pool, which means that subframe 550 is considered a periodic extension. Alternatively, however, if subframe Not in the LTE sidelink resource pool, then it is a subframe The first subframe in the LTE sidelink resource pool. Figure 5 5 is shown as a periodic extension of subframe 560. Subframe 560 is not within the LTE SL resource pool, meaning that subframe 560 is not considered a periodic extension, but the first subframe within the LTE SL resource pool after subframe 560 (e.g., subframe 570) is considered a periodic extension.

[0068] After decoding the SCI, the UE 110 may check the temporal overlap between the converted LTE logical subframe and the NR sidelink resource pool. Once the affected NR sidelink resources are identified, the UE 110 may exclude the corresponding NR subchannels that may overlap with the LTE sidelink resources in the frequency domain under certain conditions (such as high measured RSRP values). Figure 5 This is illustrated in FIG, where LTE subframe 550 does not overlap with the NR resource pool, but LTE subframe 570 does overlap with the NR resource pool.

[0069] In other exemplary embodiments, UE 110 may process logical subframes from both LTE and NR sidelinks by implementing techniques that determine whether an unmonitored LTE subframe or an LTE sidelink transmission by UE 110 is within , where the resource reservation periodicity is determined by These exemplary embodiments can also be given by Figure 5 illustrative, but in these examples, subframes 540 to 570 are unmonitored subframes or subframes in which UE 110 is transmitting LTE SL data. First, if certain conditions are met, UE 110 may convert its own LTE resource reservation or periodic extension of an unmonitored LTE subframe into an LTE sidelink logical subframe. In one aspect, if subframe is located within the LTE sidelink resource pool, then the subframe is considered a periodic extension, such as subframe 550. Alternatively, if the subframe is not in the LTE sidelink resource pool (e.g., subframe 560), then the subframe is a subframe This is followed by the first subframe (eg, subframe 570) within the LTE sidelink resource pool.

[0070] UE 110 may check the time overlap of the converted LTE logical subframes with the NR sidelink resource pool. Once the affected NR sidelink logical slots are identified, UE 110 may exclude all single-slot NR resources that overlap in time domain with LTE subframes that UE 110 is transmitting or not monitoring. Figure 5 This is illustrated in FIG, where LTE subframe 550 does not overlap with the NR resource pool, but LTE subframe 570 does overlap with the NR resource pool.

[0071] Under normal circumstances, the LTE sidelink resource pool may be configured with a 15 kHz subcarrier spacing (SCS). However, in some exemplary embodiments, the NR sidelink resource pool may be configured with a higher SCS, such as 30 kHz, 60 kHz, etc. This may cause issues with LTE sidelink reception. These exemplary embodiments introduce techniques for performing resource exclusion in NR sidelink transmissions by handling the higher SCS of the NR sidelink resource pool. These techniques are described in further detail below.

[0072] Figure 6 A timing diagram 600 illustrates exemplary resource exclusion operations when the SCS of the NR side link is higher than the SCS of the LTE side link according to various exemplary embodiments. Figure 1 Network layout 100, Figure 2 UE 110 and Figure 3 Method to describe Figure 6 .

[0073] Figure 6 LTE sidelink selected and / or reserved resources 605 and 610 and NR sidelink selected and / or reserved resources 615 and 620 are shown. Figure 6As shown, if LTE SL transmission is occurring on resource 605 while NR SL transmission is occurring on resource 615, reception of the LTE SL transmission may be affected. For example, automatic gain control (AGC) information for LTE SL transmission is typically included at the start of transmission, while NR SL transmission is ongoing. Therefore, when NR SL transmission ceases, the AGC information used by the LTE SL transmission receiver may no longer be valid, potentially causing issues for the LTE SL transmission receiver. Similar issues may also occur when LTE SL transmission is occurring on resource 610.

[0074] The exemplary embodiment provides a resource reassessment or preemption check to take into account LTE sidelink resource reservations, thereby taking into account the SCS difference between LTE SL and NR SL. The resource reassessment or preemption check may be performed only in the time domain and may include two operations. In the first operation, UE 110 may determine NR sidelink resource selection or reservation on time slots without LTE sidelink transmissions, for example, in a manner consistent with the exemplary embodiment described above.

[0075] In the second operation, when NR sidelink resource selection or reservation is imminent (e.g., Figure 6 625 in FIG. 1 ), the UE may perform a resource reassessment or preemption check. During this reassessment or preemption check, UE 110 may detect other LTE sidelink resource reservations by other UEs, or LTE sidelink transmit resource selections by UE 110. For example, when UE 110 initially reserved / selected NR sidelink resources 615, LTE SL sidelink resources 605 may not have been selected (e.g., by UE 110 or another UE). However, since the initial reservation / selection of NR sidelink resources 615, a reassessment or preemption check may reveal that LTE SL sidelink resources may have been selected. Overlap may occur at the beginning (e.g., resources 605 and 615), middle, and / or end (e.g., resources 610 and 620) of a subframe.

[0076] In some exemplary embodiments, when overlap occurs, UE 110 may abandon the selected or reserved NR sidelink resources 615 or 620. In other exemplary embodiments, if remaining time slots are available, UE 110 may extend the selected or reserved NR sidelink resources 615 or 620 to the entire subframe. UE 110 may extend the resources by simply copying the same content into the available time slots. However, UE 110 may implement this operation based on the LTE sidelink resource reservation and the data priority of the NR sidelink transmission.

[0077] In some exemplary embodiments, when the SCS of the NR sidelink is higher than the SCS of the LTE sidelink, the NR SL transmission uses multi-slot transmission. Multi-slot transmission can be considered as a transmission repeated in two time slots. The use of multi-slot transmission for NR SL can be enabled or disabled through resource pool (pre-)configuration.

[0078] FIG7 a shows a timing diagram 700 of a first exemplary manner of using multi-slot transmission when the SCS of the NR sidelink is higher than the SCS of the LTE sidelink according to various exemplary embodiments. In the example of FIG7 a , the x-axis is the time domain, but the y-axis is not the frequency domain. For example, although resource 715 is shown above resources 705 and 710, it is not required that resource 715 have a different frequency than resources 705 and 710.

[0079] In Figure 7a, UE 110 may perform multi-slot transmission for NR SL. For example, UE 110 may transmit the same content (e.g., physical sidelink control channel (PSCCH) and / or physical sidelink shared channel (PSSCH)) in slots 705 and 710. Those skilled in the art will appreciate that NR SL resources will also be used by UE 110 to receive feedback (e.g., ACK / NACK) in a physical sidelink feedback channel (PSFCH) associated with the PSCCH / PSSCH multi-slot transmission. In the example of Figure 7a, the PSFCH is shown as slot 715.

[0080] The question may arise regarding the timing of when PSFCH 715 should occur for multi-slot transmissions. In some exemplary embodiments, as shown by timing line 720, PSFCH 715 occurs in a slot that is a predetermined number of slots (e.g., two slots, three slots, etc.) after the first PSCCH / PSSCH slot 705. In other exemplary embodiments, as shown by timing line 725, PSFCH 715 occurs in a slot that is a predetermined number of slots (e.g., two slots, three slots, etc.) after the second PSCCH / PSSCH slot 710. The location of PSFCH 715 may be based on a (pre-)configuration of the resource pool or based on information included in the SCI (e.g., a reserved bit in the first stage of the SCI may indicate whether the PSFCH location is based on the first or last PSCCH / PSSCH slot). In further exemplary embodiments, multiple PSFCH transmissions may correspond to multi-slot PSCCH / PSSCH transmissions 705 and 710.

[0081] FIG7 b shows a timing diagram 750 of a second exemplary manner of using multi-slot transmission when the SCS of the NR sidelink is higher than the SCS of the LTE sidelink according to various exemplary embodiments. In the example of FIG7 b , the x-axis is the time domain, but the y-axis is not the frequency domain. For example, although resources 770 and 775 are shown above resources 760 and 765, it is not required that resources 770 and 775 have a different frequency than resources 760 and 765.

[0082] Similar to Figure 7a, Figure 7B In FIG7b , UE 110 may perform multi-slot transmission for NR SL. For example, UE 110 may transmit the same PSCCH / PSSCH content in slots 760 and 765. In the example of FIG7b , the multi-slot transmission is repeated, as shown in PSCCH / PSSCH slots 770 and 775. The time gap between PSCCH / PSSCH transmissions 760 and 765 and PSCCH / PSSCH retransmissions 770 and 775 may be indicated in the first stage of the SCI (e.g., time resource assignment).

[0083] The question may be how this time gap should be applied to multi-slot transmissions. In some exemplary embodiments, as shown by timing line 780, PSCCH / PSSCH retransmissions 770 and 775 occur based on the first PSCCH / PSSCH slot 760. In other exemplary embodiments, as shown by timing line 785, PSCCH / PSSCH retransmissions 770 and 775 occur based on the second PSCCH / PSSCH slot 765. Similarly, the timing of PSCCH / PSSCH retransmissions 770 and 775 can be based on a resource pool (pre-)configuration or based on information included in the SCI (e.g., a reserved bit in the first stage of the SCI can indicate whether the timing is based on the first or last PSCCH / PSSCH slot).

[0084] Example In a first embodiment, a method is performed by a user equipment (UE) configured to communicate with other UEs via a legacy sidelink (SL) connection and a non-legacy SL connection, the method comprising: receiving legacy SL resource information associated with legacy resources for legacy SL transmissions in a legacy resource pool, and excluding non-legacy resources in a non-legacy SL resource pool for transmitting non-legacy SL transmissions based on at least the legacy resource information.

[0085] In a second embodiment, the method is according to the first embodiment, wherein the legacy SL resource information includes side link control information (SCI) received in a first subframe of a legacy SL resource pool and a resource reservation periodicity related to the SCI, wherein the method further includes determining a second subframe based on the first subframe and the resource reservation periodicity, and determining whether the second subframe is in the legacy SL resource pool.

[0086] In a third embodiment, according to the method of the second embodiment, when the second subframe is in the legacy SL resource pool, the exclusion includes excluding a corresponding subchannel of the non-legacy resource that overlaps with the second subframe in the frequency domain.

[0087] In a fourth embodiment, according to the method of the second embodiment, when the second subframe is not in the legacy SL resource pool, the method also includes determining the next subframe in the legacy SL resource pool after the second subframe, wherein the exclusion includes excluding the corresponding subchannel of the non-legacy resource that overlaps with the next subframe in the frequency domain.

[0088] In a fifth embodiment, the method is according to the first embodiment, wherein the legacy SL resource information includes: a first subframe of the legacy SL resource pool, the first subframe being reserved for legacy transmission by the UE, or the UE has not yet monitored whether other UEs are performing legacy SL transmission for the first subframe; and a resource reservation periodicity related to the first subframe, wherein the method further includes determining a second subframe based on the first subframe and the resource reservation periodicity, and determining whether the second subframe is in the legacy SL resource pool.

[0089] In a sixth embodiment, according to the method of the fifth embodiment, when the second subframe is in the legacy SL resource pool, the excluding includes excluding non-legacy resources that temporally overlap with the second subframe.

[0090] In a seventh embodiment, the method according to the fifth embodiment, wherein, when the second subframe is not in the legacy SL resource pool, the method also includes determining the next subframe in the legacy SL resource pool after the second subframe, wherein the exclusion includes excluding non-legacy resources that overlap in time with the next subframe.

[0091] In a seventh embodiment, the method according to the first embodiment, wherein the legacy SL connection is a Long Term Evolution (LTE) SL connection, and the non-legacy SL connection is a New Radio (NR) connection.

[0092] Those skilled in the art will appreciate that the exemplary embodiments described above can be implemented with any suitable software configuration or hardware configuration or combination thereof. Exemplary hardware platforms for implementing the exemplary embodiments may include, for example, Intel x86-based platforms with compatible operating systems, Windows OS, Mac platforms and MAC OS, mobile devices with operating systems such as iOS, Android, etc. The exemplary embodiments of the above-described methods may be embodied as a program comprising lines of code stored on a non-transitory computer-readable storage medium, which, when compiled, can be executed on a processor or microprocessor.

[0093] Although this application describes various embodiments, each having different features in various combinations, those skilled in the art will understand that any feature of one embodiment may be combined with features of other embodiments in any manner that is not expressly disavowed or that is not functionally or logically inconsistent with the operation of the device or the stated function of the disclosed embodiment.

[0094] It is understood that the use of personally identifiable information should be subject to privacy policies and practices that are generally recognized to meet or exceed industry or government requirements for maintaining user privacy. Specifically, personally identifiable information data should be managed and processed to minimize the risk of unintentional or unauthorized access or use, and the nature of authorized use should be clearly stated to users.

[0095] It will be apparent to those skilled in the art that various modifications may be made to the present disclosure without departing from the spirit or scope of the present disclosure. Therefore, it is intended that the present disclosure covers modifications and variations of the present disclosure as long as they come within the scope of the appended claims and their equivalents.

Claims

1. A method performed by a user equipment (UE), the user equipment (UE) being configured to communicate with other UEs via a legacy sidelink (SL) connection and a non-legacy sidelink (SL) connection, the method comprising: receiving legacy SL resource information associated with legacy resources in a legacy resource pool for legacy SL transmission to be performed by the UE, wherein the legacy SL resource information includes a time location and a resource reservation period of the legacy resources; and Based on at least the legacy resource information, non-legacy resources in the non-legacy SL resource pool for sending non-legacy SL transmissions are excluded. 2 . The method according to claim 1 , wherein the legacy SL resources include reserved resources and selected resources. The method according to claim 1 , wherein the legacy SL resources include only reserved resources. The method of claim 1 , wherein excluding non-legacy resources comprises excluding any non-legacy resources that overlap in time with the legacy resources. The method according to claim 1 , wherein the legacy SL resource information further includes priority information.

6. The method of claim 5 , wherein excluding non-legacy resources comprises excluding any non-legacy resources that temporally overlap with the legacy resources, and wherein the priority of non-legacy data to be sent in the non-legacy resources is lower than the priority of legacy data to be sent in the legacy resources.

7. The method according to claim 1, wherein the exclusion is further based on non-legacy SL resource information, the method further comprising: After excluding the non-legacy resources of the non-legacy SL resource pool, determining whether the number of remaining resources in the non-legacy SL resource pool is less than a predetermined percentage of the total number of non-legacy resources in the non-legacy SL resource pool; and When the number of remaining resources in the non-legacy SL resource pool is less than the predetermined percentage, resetting a reference signal received power (RSRP) threshold for the non-legacy resources used for the exclusion based on the non-legacy SL resource information; as well as Re-execute the exclusion. 8 . The method of claim 7 , wherein determining whether the number of remaining resources is less than the predetermined percentage of the total number of non-legacy resources is performed after excluding all non-legacy resources based on at least the legacy resource information. 9 . The method of claim 7 , wherein determining whether the number of remaining resources is less than the predetermined percentage of the total number of non-legacy resources is performed after excluding each non-legacy resource based on at least the legacy resource information.

10. The method according to claim 1, further comprising: receiving further legacy SL resource information associated with legacy resources in the legacy resource pool, for which the UE has not yet monitored whether other UEs are performing legacy SL transmission, wherein the further legacy SL resource information includes a time position of the unmonitored legacy resources and periodicity information for the unmonitored legacy resources, The excluding of non-legacy resources in the non-legacy SL resource pool for sending non-legacy SL transmission is further based on at least the further legacy resource information. The method of claim 10 , wherein receiving further legacy SL resource information is based on a priority of data to be sent in the non-legacy resource.

12. The method of claim 1 , wherein a subcarrier spacing (SCS) of the non-legacy resources is higher than an SCS of the legacy resources, the method further comprising: After performing the exclusion, selecting at least one non-legacy resource from the remaining non-legacy resources in the non-legacy SL resource pool for sending the non-legacy SL; receiving further legacy SL resource information associated with further legacy resources in a legacy resource pool, the further legacy resources being used for legacy SL transmission to be performed by the UE; and It is determined whether the at least one non-legacy resource among the remaining non-legacy resources in the non-legacy SL resource pool temporally overlaps with any portion of one of the further legacy resources.

13. The method according to claim 12, wherein: The at least one of the non-legacy resources is excluded when the at least one non-legacy resource temporally overlaps with any portion of one of the further legacy resources.

14. The method according to claim 12, wherein: When the at least one of the non-legacy resources overlaps in time with a portion of one of the further legacy resources, the method further comprises: Extending at least one of the non-legacy resources to completely overlap in time with the one of the further legacy resources, wherein the extending comprises copying data to be sent in the at least one of the non-legacy resources to the one of the non-legacy resources being extended.

15. The method of claim 14, wherein the extending is based on a priority of the data to be sent in the at least one of the non-legacy resources.

16. The method of claim 12, wherein the data to be transmitted in the non-legacy resources comprises physical sidelink control channel (PSCCH) information and physical sidelink shared channel (PSSCH) information, and The PSCCH and PSSCH information is repeated in a first time slot of the at least one non-legacy resource among the non-legacy resources and a second time slot of the at least one non-legacy resource among the non-legacy resources, wherein the first time slot and the second time slot are consecutive time slots.

17. The method of claim 16, wherein the non-legacy resources comprise physical sidelink feedback channel (PSFCH) resources for providing feedback to the UE regarding the transmission of the PSCCH and PSSCH information in the first time slot and the second time slot, wherein the PSFCH resource is located in a predetermined number of time slots after the first time slot and the second time slot, and The configuration of the PSFCH resources is based on the configuration or pre-configuration of the non-legacy SL resource pool, or based on information received via sidelink control information (SCI).

18. The method of claim 17, wherein the configuration of the PSFCH resource comprises an indication that the PSFCH resource is located the predetermined number of time slots away from the first time slot or the second time slot.

19. A method according to claim 16, wherein the PSCCH and PSSCH information sent in the first time slot and the second time slot of the at least one non-legacy resource among the non-legacy resources is retransmitted in two further time slots located a predetermined number of time slots after the first time slot and the second time slot, wherein the predetermined number of time slots is based on the first time slot or the second time slot.

20. The method of claim 1, wherein the legacy SL connection is a Long Term Evolution (LTE) SL connection, and the non-legacy SL connection is a New Radio (NR) connection.

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