Method and apparatus for handling radio link failure

Abstract

The present disclosure relates to methods and apparatuses for handling radio link failure. According to embodiments of the present disclosure, a method includes receiving a radio link failure, RLF, report of a first sidelink communication between a first user equipment (UE) and a second UE, and releasing a sidelink radio resource configuration or transmitting information indicating release of a radio resource configuration.

Description

TECHNICAL FIELD

[0001] This application relates generally to wireless communication systems, and more particularly to methods and apparatus for handling radio link failure in a radio communication system. BACKGROUND

[0002] In a wireless communication system, one user equipment (or UE, such as a mobile device) can communicate with another UE via a data path of an operator network. The data path of the network can include a base station (or BS) and a gateway.

[0003] If the UEs are relatively close to each other, a radio link or sidelink can be established without going through a direct link to the BS to provide device-to-device (or D2D) communication. In contrast to the communication via cellular infrastructure (uplink and downlink) discussed above, the term “sidelink” refers to a direct radio link for communication between devices. The “sidelink” is also referred to as a D2D link. D2D communication can be used in any suitable telecommunication network according to various standards. The network can configure a resource pool in which D2D operation can be performed by UEs.

[0004] D2D operation can provide various advantages, such as relatively high transfer rate, relatively low latency, etc. Moreover, in D2D operation, traffic that is concentrated on a base station can be distributed. Furthermore, D2D UEs can be used as relays to extend coverage of a base station.

[0005] D2D communication incorporates vehicle-to-everything (or V2X) communication into long term evolution (LTE) sidelink. V2X communication covers communication involving vehicles as a source or destination of messages. In a new radio (NR) communication system, unicast and groupcast are introduced into V2X communication. An access stratum (AS) connection can be established to implement unicast or groupcast over a sidelink.

[0006] A radio link or sidelink can fail due to various factors, such as (but not limited to) building blockage, relatively long distance between UEs, blockage by moving objects (such as vehicles), plants (due to seasonal changes), etc. Although radio resource management (RRM) and radio link monitoring (RLM) have been developed based on AS-level link management to maintain a sidelink. However, RRM and RLM can not be sufficient to address the above issues. Therefore, a mechanism is needed to report and handle radio link failure (RLF) over a sidelink. SUMMARY

[0007] According to some embodiments of the present application, a method includes receiving a report of a radio link failure (RLF) of a first sidelink communication between a first user equipment (UE) and a second UE, and releasing a sidelink radio resource configuration.

[0008] According to some embodiments of the present application, a method includes receiving a report of a radio link failure (RLF) of a first sidelink communication between a first user equipment (UE) and a second UE, and transmitting information indicating a release of a radio resource configuration.

[0009] According to some embodiments of the present application, a method includes detecting an RLF of a first sidelink communication between a first UE and a second UE, and transmitting an RLF report.

[0010] According to some embodiments of the present application, a method includes detecting an RLF of a first sidelink communication between a first UE and a second UE, and releasing a sidelink radio resource configuration.

[0011] According to some embodiments of the present application, an apparatus includes at least one non-transitory computer-readable medium having computer-executable instructions stored therein. The apparatus further includes at least one receiver. The apparatus further includes at least one transmitter. The apparatus further includes at least one processor. The processor is coupled to the at least one non-transitory computer-readable medium, the at least one receiver, and the at least one transmitter. The at least one non-transitory computer-readable medium and the computer-executable instructions are configured, using the at least one processor, to cause the apparatus to perform the above method. BRIEF DESCRIPTION OF DRAWINGS

[0012] The description of the present disclosure is presented to describe an example embodiment of the present disclosure as depicted in the accompanying drawings. The drawings merely depict example embodiments of the present disclosure and therefore are not to be considered limiting of its scope.

[0013] Figure 1 A wireless communication system is illustrated in accordance with some embodiments of the present application;

[0014] Figure 2 Another wireless communication system is illustrated in accordance with some embodiments of the present application;

[0015] Figure 3 A sidelink connection is illustrated in accordance with some embodiments of the present application;

[0016] Figure 4 A method of handling a radio link failure is illustrated in accordance with some embodiments of the present application;

[0017] Figure 5 Another method of handling a radio link failure is illustrated in accordance with some embodiments of the present application;

[0018] Figure 6Another method of handling radio link failure according to some embodiments of the present application is explained;

[0019] Figure 7 Signaling associated with interactions involving sidelink communications in a wireless communication system according to some embodiments of the present application is explained;

[0020] Figure 8 Signaling associated with interactions involving sidelink communications in a wireless communication system according to some other embodiments of the present application is explained;

[0021] Figure 9 Signaling associated with interactions involving sidelink communications in a wireless communication system according to some other embodiments of the present application is explained; and

[0022] Figure 10 An apparatus for handling radio link failure according to some embodiments of the present application is explained. DETAILED DESCRIPTION

[0023] The detailed description of the drawings is intended for purposes of explanation only and is not intended to limit the form or function of the present disclosure. It will be readily understood that the same or equivalent functions can be accomplished by different embodiments that are intended to be encompassed within the spirit and scope of the present disclosure.

[0024] Figure 1 A wireless communication system 1 according to some embodiments of the present application is explained.

[0025] Reference Figure 1 The wireless communication system 1 includes a base station BS, a user equipment UE 1, a user equipment UE 2, a user equipment UE 3, a user equipment UE 4, a user equipment UE 5, a user equipment UE 6, and a user equipment UE 7. Although only one base station is illustrated in Figure 1 for simplicity, it is contemplated that the wireless communication system 1 can include more base stations in some other embodiments of the present application. Although only the UE 1, the UE 2, the UE 3, the UE 4, the UE 5, the UE 6, and the UE 7 are illustrated in Figure 1 for simplicity, it is contemplated that the wireless communication system 1 can include more or less UEs in some other embodiments of the present application.

[0026] The BS can operate, for example, but not limited to, based on a Long Term Evolution (LTE), LTE-Advanced (LTE-A), New Radio (NR) standard protocol, or other suitable protocol.

[0027] The UE 1 can include, for example, but not limited to, a computing device, a wearable device, a mobile device, an IoT device, a vehicle with at least one transceiver, etc. Each of the UE 2, UE 3, UE 4, UE 5, UE 6, and UE 7 can include the same or similar devices as the UE 1. Each of the UE 2, UE 3, UE 4, UE 5, UE 6, and UE 7 can include different devices than the UE 1. Those skilled in the art will understand that the terminology described in this disclosure can change as technology develops and advances, and should not affect or limit the principles and spirits of this disclosure. Each of the UE 1, UE 2, UE 3, UE 4, UE 5, UE 6, and UE 7 is within the coverage of the BS.

[0028] The BS can perform resource scheduling for each of the UE 1, UE 2, UE 3, UE 4, UE 5, UE 6, and UE 7 to perform data transmission and information control during direct D2D or sidelink communication.

[0029] Each of the UE 1, UE 2, UE 3, UE 4, UE 5, UE 6, and UE 7 can itself select resources from a resource pool for D2D or sidelink communication during direct data transfer and direct information control.

[0030] Figure 2 A wireless communication system 2 according to some embodiments of the present application is illustrated.

[0031] Reference is made to Figure 2 The wireless communication system 2 includes a user equipment UE 1, a user equipment UE 2, a user equipment UE 3, a user equipment UE 4, a user equipment UE 5, a user equipment UE 6, and a user equipment UE 7. Although only the UE 1, UE 2, UE 3, UE 4, UE 5, UE 6, and UE 7 are illustrated in Figure 2 It is contemplated that the wireless communication system 2 can include more or less UEs in some other embodiments of the present application.

[0032] UE 1 can include, for example, but not limited to, a computing device, a wearable device, a mobile device, an IoT device, a vehicle with at least one transceiver, etc. Each of UE 2, UE 3, UE 4, UE 5, UE 6, and UE 7 can include the same or similar devices as UE 1. Each of UE 2, UE 3, UE 4, UE 5, UE 6, and UE 7 can include different devices than UE 1. Those skilled in the art understand that as technology develops and advances, the terminology described in this disclosure can change, and should not affect or limit the principles and spirit of the disclosure. Each of UE 1, UE 2, UE 3, UE 4, UE 5, UE 6, and UE 7 is out of coverage of the BS. Wireless communication system 2 is out of coverage of the BS.

[0033] Because UE 1, UE 2, UE 3, UE 4, UE 5, UE 6, and UE 7 are out of coverage of the BS, the BS cannot schedule resources for each of UE 1, UE 2, UE 3, UE 4, UE 5, UE 6, and UE 7 to perform sidelink communication.

[0034] Each of UE 1, UE 2, UE 3, UE 4, UE 5, UE 6, and UE 7 can itself select resources from a resource pool for D2D or sidelink communication.

[0035] Figure 3 A sidelink connection is illustrated in accordance with some embodiments of the present application.

[0036] Reference is made to Figure 3 A sidelink connection 3 is established between UE 1 and UE 2 as shown in Figure 1 or Figure 2 . Sidelink connection 3 includes carriers C1, C2, C3, C4, and C5. Although only carriers C1, C2, C3, C4, and C5 are illustrated in Figure 3 for simplicity, it is contemplated that in some other embodiments of the present application, sidelink connection 3 can include more or fewer carriers. In other words, carriers C1, C2, C3, C4, and C5 are used in sidelink connection 3 between UE 1 and UE 2.

[0037] In NR V2X, there is a service-to-carrier mapping relationship on the sidelink, which means one V2X service can be mapped to one or more carriers, and one carrier can be mapped to one or more V2X services. The service between UEs can include radio bearer related configuration. The V2X service between UEs can further include quality of service (QoS) related configuration. The V2X service between UEs can further include radio resource related configuration. The V2X service between UEs can include at least one of radio bearer related configuration, QoS related configuration, or radio resource related configuration, and combinations thereof. The type of V2X service is not limited thereto, which can be selected according to actual needs.

[0038] For example, service 31 can be mapped to carriers C1, C2, and C3 on sidelink connection 3. In other words, carriers C1, C2, and C3 are configured for service 31. Carrier C4 is configured for service 32. Carrier C5 is configured for service 33 and service 34.

[0039] Figure 4 A method 4 of handling radio link failure (or RLF) according to some embodiments of the present application is illustrated. Method 4 can be used to handle RLF in wireless communication 1 as shown in Figure 1

[0040] Referring back to Figure 1 , assume that UE 1 can act as a receiver UE and UE 2 can act as a transmitter UE during sidelink communication between UE 1 and UE 2. UE 1 monitors the sidelink connection (e.g., sidelink connection 3 as shown in Figure 3

[0041] ​​If the sidelink connection carrier between UE 1 and UE 2 fails, RLF can be determined, declared, or detected by UE 1. For example, after an expiration message is received on the carrier of the sidelink connection between UE 1 and UE 2, RLF can be determined, declared, or detected by UE 1. The expiration message can be generated by a timer in a lower layer (e.g., physical layer or other suitable layer) of UE 1. For example, in the physical layer of UE 1, a timer is started after a "not in sync" indication of the sidelink carrier is received, and if the number of consecutive "not in sync" indications reaches or exceeds a predetermined value (or threshold), the sidelink carrier is determined, declared, or detected as failed. If a "sync" indication of the sidelink carrier is received before the number of consecutive "sync" indications reaches or exceeds the threshold, the timer is stopped.

[0042] RLF can be determined, declared, or detected by UE 1 based on the number of retransmissions of the carrier of the sidelink connection between UE 1 and UE 2. For example, if the number of retransmissions of the sidelink carrier reaches or exceeds a predetermined value (or threshold), the sidelink carrier is determined, declared, or detected as failed.

[0043] Referring back to Figure 3 , the RLF report can include a sidelink connection identifier (ID) of the sidelink communication, e.g., the ID of sidelink connection 3. The RLF report can include an ID of the UE, e.g., the ID of UE 1. The RLF report can include an ID of the UE, e.g., the ID of UE 2. The report can include a carrier index, e.g., the carrier index of each of C1, C2, C3, C4, or C5 shown in Figure 3 . The RLF report can include a V2X service ID, e.g., the V2X service ID of each of service 31, service 32, service 33, and service 34.

[0044] The RLF report can also include at least one of the following information: a sidelink connection identifier (ID) of the sidelink communication, an ID of the transmitter UE, an ID of the receiver UE, a carrier index, a V2X service ID, or other parameters.

[0045] RLF can be determined, declared, or detected by UE 1 if all carriers of the sidelink connection fail. For example, if all carriers C1-C5 of sidelink connection 3 with the same sidelink connection ID fail, RLF is determined or declared. The RLF report can include information indicating that all carriers C1-C5 with the same sidelink connection ID fail.

[0046] If all carriers used for service on sidelink connection 3 fail, then an RLF can be determined, declared, or detected by UE 1. For example, if carriers C1 through C3 (which have the same V2X service ID for service 31) fail, then an RLF is determined, declared, or detected. For example, if carrier C4 (which has the same V2X service ID for service 32) fails, then an RLF is determined, declared, or detected. For example, if carrier C5 (which has two different V2X service IDs for services 33 and 34 respectively) fails, then an RLF is determined, declared, or detected. In other words, if service on the sidelink connection fails, then an RLF is determined, declared, or detected.

[0047] RLF reports may contain information indicating a service (e.g., service 31) failure. In this case, carriers C1, C2, and C3 have failed, but carriers C4 and C5 remain functional. BS, UE 1, or UE 2 may reconfigure the resource pool or reschedule data to carriers C4, C5, or both for service 31.

[0048] In some embodiments of this disclosure, the RLF (Relational Link Default) for sidelink communication is determined by the receiver UE after a failure occurs in one of the multiple carriers having a sidelink connection ID for sidelink communication. The RLF report may include information indicating that a failure has occurred in one of the multiple carriers having a sidelink connection ID for sidelink communication.

[0049] In some embodiments of this disclosure, a V2X UE may have sidelink connections with different UEs. For example, such as Figure 1 or Figure 2 As shown, at the same time, UE 1 has a unicast connection with UE 2, UE 1 has a unicast connection with UE 6, and UE 2 has a unicast connection with UE 6. The RLF (Restricted Link Default) of the unicast connection between UE 1 and UE 2 will not affect the unicast connection between UE 1 and UE 6, or the unicast connection between UE 2 and UE 6. Similarly, the RLF of the unicast connection between UE 1 and UE 6 will not affect the unicast connection between UE 1 and UE 2, or the unicast connection between UE 2 and UE 6. The RLF of the unicast connection between UE 2 and UE 3 will not affect the unicast connection between UE 1 and UE 6, or the unicast connection between UE 1 and UE 2. In other words, the RLF of a unicast connection between any two UEs will not affect any other unicast connection between UEs. Sidelink connections between UEs are not limited to... Figure 1 or Figure 2 In other embodiments of this disclosure, one of a plurality of sidelink connections may be established between any UE and other UEs.

[0050] refer toFigure 4 In operation 401, the BS receives an RLF report from UE 1.

[0051] In Operation 402, the BS can release the sidelink radio resource configuration to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0052] Alternatively, in operation 403, the BS may transmit information indicating the release of sidelink radio resource configuration to UE2. Upon receiving the information indicating the release of sidelink radio resource configuration, UE2 may release the sidelink radio resource configuration to establish another sidelink connection or a new sidelink connection between UE1 and UE2.

[0053] In some embodiments of this disclosure, the sidelink radio resource configuration may include a radio configuration. The sidelink radio resource configuration may further include a unicast connection. The sidelink radio resource configuration may include at least one of a radio configuration or a unicast connection.

[0054] Figure 5 This application describes another method for handling radio link failures according to some embodiments of the present application. Method 5 can be used to handle situations such as... Figure 1 The wireless communication 1 shown in the example demonstrates RLF. Method 5 can be used to handle situations such as... Figure 2 The RLF in wireless communication 2 is shown in the image.

[0055] Return to reference Figure 1 Assume that during sidelink communication between UE1 and UE2, UE1 can act as a receiver UE and UE2 can act as a transmitter UE. UE1, as a receiver UE, monitors the sidelink connection between UE1 and UE2 (e.g., Figure 3 (See side link connection 3 shown in the figure). Once an RLF is detected or declared, UE 1 can transmit or send an RLF report to UE 2.

[0056] refer to Figure 5 In Operation 501, UE 2 receives an RLF report.

[0057] If it is determined in Operation 502 that UE 2 is within the coverage area of ​​the BS, such as Figure 1 As shown in the example, UE 2 can release the sidelink radio resource configuration in operation 506 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0058] Alternatively, if it is determined in operation 502 that UE 2 is within the coverage area of ​​the BS, then UE 2 may transmit an RLF report to the BS in operation 504. The BS may transmit or send information indicating the release of the sidelink radio resource configuration to UE 2. After receiving the information indicating the release of the sidelink radio resource configuration from the BS in operation 505, UE 2 may release the sidelink radio resource configuration in operation 506 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0059] Alternatively, if it is determined in operation 502 that UE 2 is within the coverage area of ​​the BS, then UE 2 may transmit an RLF report to the upper layer residing therein in operation 503. Upon receiving the RLF report, the upper layer of UE 2 may release the sidelink radio resource configuration in operation 506 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0060] The UE may include an upper layer. The upper layer is defined to distinguish it from the AS layer and the UE's lower layer. The upper layer may include a Non-Access Stratum (NAS) layer. The upper layer may include a V2X layer. The upper layer may include an application layer. The upper layer may include at least one of the NAS layer, V2X layer, or application layer. When the upper layer of UE 1 receives an RLF report, it may indicate the release of sidelink radio resource configuration. When the upper layer of UE 2 receives an RLF report, it may indicate the release of sidelink radio resource configuration.

[0061] In other words, regardless of whether UE 1 and UE 2 are within the coverage area of ​​the BS (e.g., in...), Figure 1 (in China) or outside the coverage area of ​​the BS (e.g., in...) Figure 2 In the middle layer, the upper layer can instruct to change the serving carrier or release the unicast connection after receiving the RLF report in order to establish another side link connection or a new side link connection between UE 1 and UE 2.

[0062] Return to reference Figure 2 Assume that during sidelink communication between UE1 and UE2, UE1 can act as a receiver UE and UE2 can act as a transmitter UE. UE1, as a receiver UE, monitors the sidelink connection between UE1 and UE2 (e.g., Figure 3 (See side link connection 3 shown in the figure). Once an RLF is detected or declared, UE 1 can transmit or send an RLF report to UE 2.

[0063] refer to Figure 5 In Operation 501, UE 2 receives an RLF report.

[0064] If it is determined in Operation 502 that UE 2 is outside the coverage area of ​​the BS, such as Figure 2As shown in the example, UE 2 can release the sidelink radio resource configuration in operation 506 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0065] Alternatively, if it is determined in operation 502 that UE 2 is outside the coverage area of ​​the BS, then UE 2 may transmit an RLF report to the upper layer residing therein in operation 503. Upon receiving the RLF report, the upper layer of UE 2 may release the sidelink radio resource configuration in operation 506 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0066] Figure 6 This application describes another method for handling radio link failures according to some embodiments of the present application. Method 6 can be used to handle situations such as... Figure 1 The wireless communication 1 shown in the example illustrates RLF. Method 6 can be used to handle situations such as... Figure 2 The RLF in wireless communication 2 is shown in the image.

[0067] Return to reference Figure 2 Assume that during sidelink communication between UE1 and UE2, UE1 can act as a receiver UE and UE2 can act as a transmitter UE. UE1, as a receiver UE, monitors the sidelink connection between UE1 and UE2 (e.g., Figure 3 (See side link connection 3 shown in the figure). Once an RLF is detected or declared, UE 1 can transmit or send an RLF report to UE 2.

[0068] refer to Figure 6 In operation 601, UE 1 detects the RLF of the sidelink connection between UE 1 and UE 2.

[0069] If it is determined in Operation 602 that UE 1 is outside the coverage area of ​​the BS, such as Figure 2 As shown in the diagram, UE 1 can transmit an RLF report to the upper layer residing therein in operation 604. After receiving the RLF report, the upper layer of UE 1 can release the sidelink radio resource configuration in operation 605 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0070] Return to reference Figure 1 Assume that during sidelink communication between UE1 and UE2, UE1 can act as a receiver UE and UE2 can act as a transmitter UE. UE1, as a receiver UE, monitors the sidelink connection between UE1 and UE2 (e.g., Figure 3 (See side link connection 3 shown in the figure). Once an RLF is detected or declared, UE 1 can transmit or send an RLF report to UE 2.

[0071] refer to Figure 6 In operation 601, UE 1 detects the RLF of the sidelink connection between UE 1 and UE 2.

[0072] If it is determined in Operation 602 that UE 1 is within the coverage area of ​​the BS, such as Figure 2 As shown in the diagram, UE 1 can transmit an RLF report to the upper layer residing therein in operation 604. After receiving the RLF report, the upper layer of UE 1 can release the sidelink radio resource configuration in operation 605 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0073] Alternatively, if it is determined in operation 602 that UE 1 is within the coverage area of ​​the BS, such as Figure 1 As shown in the diagram, UE 1 can transmit an RLF report to UE 2 or BS in Operation 603. Upon receiving the RLF report, UE 2 or BS can release the sidelink radio resource configuration to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0074] Figure 7 This application describes signaling associated with interactions involving side-link communication in a wireless communication system, according to some embodiments of the present application. These interactions can be used to handle, for example... Figure 2 The RLF in wireless communication 2 is shown in the image.

[0075] Return to reference Figure 2 Assume that during sidelink communication between UE1 and UE2, UE1 can act as a receiver UE and UE2 can act as a transmitter UE. UE1, as a receiver UE, monitors the sidelink connection between UE1 and UE2 (e.g., Figure 3 The side link connection shown in Figure 3).

[0076] Once an RLF occurs or appears on the sidelink connection between UE1 and UE2 in operation 701, UE1 can transmit or send an RLF report to UE2 in operation 702. Because in Figure 2 If UE 1 and UE 2 are determined to be outside the coverage area of ​​the BS, then UE 2 can release the sidelink radio resource configuration in operation 703 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0077] Alternatively, once an RLF occurs or appears on the sidelink connection between UE1 and UE2 in operation 701, UE1 can transmit or send an RLF report to the upper layer residing therein in operation 702. Because in Figure 2If UE 1 and UE 2 are determined to be outside the coverage area of ​​the BS, then the upper layer of UE 1 or UE 2 can release the sidelink radio resource configuration in operation 703 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0078] Figure 8 This describes signaling associated with interactions involving side-link communication in a wireless communication system according to some other embodiments of this application. The interactions can be used to handle, for example... Figure 1 The RLF in wireless communication 1 is shown in the figure.

[0079] Return to reference Figure 1 Assume that during sidelink communication between UE1 and UE2, UE1 can act as a receiver UE and UE2 can act as a transmitter UE. UE1, as a receiver UE, monitors the sidelink connection between UE1 and UE2 (e.g., Figure 3 The side link connection shown in Figure 3).

[0080] Once an RLF occurs or appears on the side link connection between UE1 and UE2 in operation 801, UE1 can transmit or send an RLF report to UE2 in operation 802, and UE2 can transmit or send an RLF report to the BS in operation 803. Figure 1 If UE 1 and UE 2 are determined to be within the coverage area of ​​the BS, the BS may release the sidelink radio resource configuration in operation 805 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0081] Alternatively, once an RLF occurs or appears on the side link connection between UE1 and UE2 in operation 801, UE1 can transmit or send an RLF report to the BS in operation 804. Figure 1 If UE 1 and UE 2 are determined to be within the coverage area of ​​the BS, the BS may release the sidelink radio resource configuration in operation 805 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0082] Alternatively, once an RLF occurs or appears on the side link connection between UE1 and UE2 in operation 801, UE1 can transmit or send an RLF report to the BS in operation 804. Figure 1 If UE 1 and UE 2 are determined to be within the coverage area of ​​the BS, the BS may instruct UE 2 to release the sidelink radio resource configuration in Operation 805 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0083] Alternatively, once an RLF occurs or appears on the side link connection between UE1 and UE2 in operation 801, UE1 can transmit or send an RLF report to UE2 in operation 802, and UE2 can transmit or send an RLF report to the BS in operation 803. Figure 1 If UE 1 and UE 2 are determined to be within the coverage area of ​​the BS, the BS may instruct UE 2 to release the sidelink radio resource configuration in Operation 805 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0084] Figure 9 This describes signaling associated with interactions involving side-link communication in a wireless communication system according to some other embodiments of this application. The interactions can be used to handle, for example... Figure 1 The RLF in wireless communication 1 is shown in the figure.

[0085] Return to reference Figure 1 Assume that during sidelink communication between UE1 and UE2, UE1 can act as a receiver UE and UE2 can act as a transmitter UE. UE1, as a receiver UE, monitors the sidelink connection between UE1 and UE2 (e.g., Figure 3 The side link connection shown in Figure 3).

[0086] Once an RLF occurs or appears on the sidelink connection between UE1 and UE2 in operation 901, UE1 can transmit or send an RLF report to UE2 in operation 902, and UE2 can transmit or send an RLF report to the BS in operation 903. Figure 1 If UE 1 and UE 2 are determined to be within the coverage area of ​​the BS, UE 2 can release the sidelink radio resource configuration in Operation 905 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0087] Alternatively, once an RLF occurs or appears on the side link connection between UE1 and UE2 in operation 901, UE1 can transmit or send an RLF report to the BS in operation 904. Figure 1 If UE 1 and UE 2 are within the coverage area of ​​the BS, UE 2 can release the sidelink radio resource configuration in Operation 905 to establish another sidelink connection or a new sidelink connection between UE 1 and UE 2.

[0088] Alternatively, once an RLF occurs or appears on the sidelink connection between UE1 and UE2 in operation 901, UE1 can transmit or send an RLF report to the upper layer residing therein in operation 902. Although in Figure 1It is determined that UE1 and UE2 are within the coverage area of ​​the BS, but the upper layer of UE1 or UE2 may release the sidelink radio resource configuration in Operation 905 to establish another sidelink connection or a new sidelink connection between UE1 and UE2.

[0089] Figure 10 This application describes an apparatus for handling radio link failures according to some embodiments of the present application.

[0090] like Figure 10 As shown, device 100 may include non-transitory computer-readable medium 101. Device 100 may further include receiver 102. Device 100 may further include transmitter 103. Device 100 may further include processor 104. Non-transitory computer-readable medium 101 stores computer-executable instructions. Processor 104 is configured to be coupled to non-transitory computer-readable medium 101. Processor 104 is configured to be coupled to receiver 102. Processor 103 is configured to be coupled to transmitter 103. In some other embodiments of this application, device 100 may include more computer-readable medium, receiver, transmitter, and processor as needed. In some embodiments, device 100 may be a BS. The BS may operate (e.g., but not limited to) a standard protocol based on LTE, LTE-A, NR, or other suitable protocols. In some embodiments, device 100 may be a UE. The UE may include, for example (but not limited to), a computing device, wearable device, mobile device, IoT device, vehicle with at least one transceiver, etc. In some embodiments, receiver 102 and transmitter 103 are integrated into a single device, such as a transceiver. In certain embodiments, device 100 may further include input devices, memory, and / or other components.

[0091] In some embodiments, a non-transitory computer-readable medium may store computer-executable instructions thereon that cause a processor to perform the methods of the BS described above. For example, the non-transitory computer-readable medium 101 and the computer-executable instructions are configured to use processor 104 to cause device 100 to perform the methods of the BS described above. Figures 4 to 9 The operation of BS is described in the text.

[0092] In some embodiments, a non-transitory computer-readable medium may store computer-executable instructions thereon that cause a processor to perform a method relating to UE 1, assuming it is used as a receiver UE, as described above. For example, the non-transitory computer-readable medium 101 and the computer-executable instructions are configured to use processor 104 to cause device 100 to perform a method relating to UE 100. Figures 4 to 9 The operation of UE 1 is described in the text.

[0093] In some embodiments, a non-transitory computer-readable medium may store computer-executable instructions thereon that cause a processor to perform a method relating to UE2, assuming it is used as transmitter UE2, as described above. For example, the non-transitory computer-readable medium 101 and the computer-executable instructions are configured to use processor 104 to cause device 100 to perform a method relating to UE2. Figures 4 to 9 The operation of UE 2 is described in the text.

[0094] In some embodiments, the device may include a PC5 interface. The RLM / RLF method described in this disclosure is applicable to PC5 interfaces between devices, and the devices are not limited thereto. The device may be a vehicle. Those skilled in the art will understand that the terminology described in this disclosure may change as technology develops and advances, and this should not affect or limit the principles and spirit of this disclosure.

[0095] Those skilled in the art will understand that the steps of the methods described in connection with the aspects disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or a combination of both. The software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. Furthermore, in some aspects, the steps of the method may reside as one or any combination or set of code and / or instructions on a non-transitory computer-readable medium that can be incorporated into a computer program product.

[0096] Although this disclosure has been described with reference to specific embodiments thereof, it will be apparent to those skilled in the art that many alternatives, modifications, and variations will be readily apparent. For example, various components of the embodiments may be interchanged, added, or substituted in other embodiments. Moreover, not all elements of each figure are essential to the operation of the disclosed embodiments. For example, those skilled in the art of the disclosed embodiments will be able to make and use the teachings of this disclosure by simply employing the elements of the independent claims. Therefore, the embodiments of this disclosure set forth herein are intended to be illustrative rather than restrictive. Various changes may be made without departing from the spirit and scope of this disclosure.

[0097] In this document, the term "comprise / comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but may also include other elements not expressly listed or inherent to the process, method, article, or apparatus. An element beginning with "a / an" or the like (without further constraints) does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element. Furthermore, the term "another" is defined as at least one second or more. As used herein, the terms "comprising," "having," and the like are defined as "including."

Claims

1. A method performed by a base station, comprising: receiving a radio link failure (RLF) report for a first sidelink communication between a first user equipment (UE) and a second UE, wherein the first sidelink communication is performed on at least one carrier and is configured for at least one vehicle-to-anything (V2X) service, and wherein the RLF report includes at least one of a carrier index value of an associated carrier or a service ID associated with the associated carrier; and releasing a sidelink radio resource configuration corresponding to the associated carrier or a service associated with the associated carrier, or transmitting information indicating a release of a radio resource configuration corresponding to the associated carrier.

2. The method of claim 1, wherein the sidelink radio resource configuration comprises a radio configuration or a unicast connection.

3. The method of claim 1, wherein the RLF report includes at least one of the following information: a sidelink connection identifier (ID) of the first sidelink communication, an ID of the first UE, or an ID of the second UE.

4. The method of claim 1, wherein the RLF report includes information indicating that all of the carriers with the same sidelink connection ID for the first sidelink communication have failed.

5. The method of claim 1, wherein the RLF report includes information indicating that all of the carriers with the same V2X service ID for the first sidelink communication have failed.

6. The method of claim 1, wherein the RLF report includes information indicating that one of the carriers with a sidelink connection ID for the first sidelink communication has failed.

7. The method of claim 1, further comprising: releasing a sidelink radio resource configuration when the first UE and the second UE are in coverage of the base station.

8. The method of claim 1, further comprising: transmitting information indicating a release of a radio resource configuration when the first UE and the second UE are in coverage of the base station.

9. A method performed by a first user equipment (UE), comprising: detecting a radio link failure (RLF) for a first sidelink communication between the first UE and a second UE, wherein the first sidelink communication is performed on at least one carrier and is configured for at least one vehicle-to-anything (V2X) service; and transmitting an RLF report to a base station, or releasing a sidelink radio resource configuration corresponding to an associated carrier or a service associated with the associated carrier, wherein the RLF report includes at least one of an index value of the associated carrier or a service ID associated with the associated carrier.

10. The method of claim 9, wherein the sidelink radio resource configuration comprises a radio configuration or a unicast connection.

11. The method of claim 9, wherein the RLF report further includes at least one of the following information: a sidelink connection identifier (ID) of the first sidelink communication, an ID of the first UE, or an ID of the second UE.

12. The method of claim 9, wherein the RLF of the first sidelink communication is determined by the first UE after all carriers with a same sidelink connection ID for the first sidelink communication fail.

13. The method of claim 9, wherein the RLF of the first sidelink communication is determined by the first UE after all carriers with a same V2X service ID for the first sidelink communication fail.

14. The method of claim 9, wherein the RLF of the first sidelink communication is determined by the first UE after one of the plurality of carriers with a same sidelink connection ID for the first sidelink communication fails.

15. The method of claim 9, wherein the RLF report includes information indicating that all of the carriers with the same sidelink connection ID for the plurality of carriers for the first sidelink communication fail.

16. The method of claim 9, wherein the RLF report includes information indicating that all of the carriers with the same V2X service ID for the plurality of carriers for the first sidelink communication fail.

17. The method of claim 9, wherein the RLF report includes information indicating that one of the plurality of carriers with a sidelink connection ID for the first sidelink communication fails.

18. The method of claim 9, further comprising: transmitting the RLF report to an upper layer of the first UE when the first UE and the second UE are out of coverage of the base station, and optionally wherein the upper layer comprises a NAS layer, a V2X layer, or an application layer.

19. The method of claim 18, further comprising: releasing, by the upper layer, a sidelink radio resource configuration.

Images