Node equipment in communication system and execution method thereof

Abstract

The present disclosure provides a node device in a communication system and an execution method thereof, in which a method executed by a user equipment (UE) in a wireless communication system is disclosed, comprising: generating a radio link failure (RLF) report, the RLF report comprising time information when the UE generates an RLF and identification information of a failed cell; receiving a fifth message for requesting UE information from the first base station; and sending a sixth message for responding to the fifth message to the first base station, wherein the sixth message comprises the RLF report.

Description

Technical Field

[0001] The present application relates to wireless communication technology, and in particular to a method and device supporting self-configuration / self-optimization. Background Art

[0002] In order to meet the increased demand for wireless data communication services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or quasi-5G communication systems. Therefore, 5G or quasi-5G communication systems are also referred to as "super 4G networks" or "post-LTE systems."

[0003] Wireless communication is one of the most successful innovations in modern history. The number of subscribers to wireless communication services recently exceeded 5 billion and continues to grow rapidly. The demand for wireless data services is growing rapidly due to the increasing popularity of smartphones and other mobile data devices (e.g., tablets, laptops, netbooks, e-book readers, and machine-type devices) among consumers and enterprises. In order to meet the high growth of mobile data services and support new applications and deployments, it is critical to improve the efficiency and coverage of the wireless interface. Summary of the invention

[0004] According to one aspect of the present disclosure, a method performed by a user equipment UE in a wireless communication system is provided, comprising: generating a radio link failure RLF report, the RLF report comprising time information of the UE RLF occurrence and identification information of the failed cell; receiving a fifth message for requesting UE information from a first base station; and sending a sixth message for responding to the fifth message to the first base station, the sixth message comprising the RLF report.

[0005] In one embodiment, the RLF report further includes information related to the type of failed cell, and the type of failed cell includes at least one of the following: a cell corresponding to a mobile satellite, a cell corresponding to a ground stationary orbit satellite GEO, and a cell corresponding to an aircraft.

[0006] In one embodiment, the RLF report includes indication information, where the indication information indicates a type of execution condition of the UE conditional switching.

[0007] In an embodiment, the indication information may be set to be based on time, based on location or based on measurement, or indicate conditional execution without any trigger condition switching.

[0008] In one embodiment, the time information when the UE RLF occurs includes absolute time information or relative time information.

[0009] In one embodiment, the identification information of the failed cell includes at least one of the following: a tracking area identifier of the cell, a globally unique identifier of the cell, and a physical layer identifier of the cell.

[0010] In one embodiment, the fifth message includes a UE information request / report message, and / or the sixth message includes a UE information request response message.

[0011] According to another aspect of the present disclosure, a method performed by a first base station in a wireless communication system is provided, comprising: sending a fifth message for requesting UE information to a user equipment UE; receiving a sixth message for responding to the fifth message from the UE, the sixth message comprising a radio link failure RLF report; and sending a seventh message comprising an RLF report to a second base station, wherein the RLF report comprises time information of when the UE experiences RLF and identification information of a failed cell.

[0012] In one embodiment, the RLF report further includes information related to the type of the failed cell, where the type of the failed cell includes at least one of the following: a cell corresponding to a mobile satellite, a cell corresponding to a geostationary orbit satellite, and a cell corresponding to an aircraft.

[0013] In one embodiment, the time information when the UE RLF occurs includes absolute time information or relative time information.

[0014] In one embodiment, the second base station is determined based on at least one of the time information of the UE RLF occurrence in the RLF report, the identification information of the failed cell, and the ephemeris information stored by the first base station.

[0015] In one embodiment, the identification information of the failed cell includes at least one of the following: a tracking area identifier of the cell, a globally unique identifier of the cell, and a physical layer identifier of the cell.

[0016] In one embodiment, the fifth message comprises a UE Information Request / Report message, and the sixth message comprises a UE Information Request Response message.

[0017] In one embodiment, the first base station sends an eleventh message to the core network device, wherein the eleventh message carries the seventh message.

[0018] In one embodiment, the eleventh message includes at least one of the following: an identifier of the destination base station; a tracking area indication of the destination base station; the time when the UE RLF occurs; an identifier of the source base station; a tracking area indication of the source base station; and an RLF report container.

[0019] According to another aspect of the present disclosure, a method performed by a second base station in a wireless communication system is provided, comprising: receiving a thirteenth message from a first base station or a core network device, the thirteenth message comprising a radio link failure RLF report, the RLF report comprising time information of when the UE experiences RLF and identification information of a failed cell; and adjusting configuration parameters related to the failed cell based on the received RLF report.

[0020] In one embodiment, adjusting the configuration parameters related to the failed cell further includes: adjusting the configuration parameters related to the failed cell based on ephemeris information stored by the second base station.

[0021] In one embodiment, adjusting the configuration parameters related to the failed cell includes: adjusting configuration parameters of a satellite where the failed cell is located, and / or adjusting switching parameters from the failed cell to a cell on the first base station.

[0022] In one embodiment, the second base station is connected to a satellite, or the second base station is located on a satellite, or part of the functionality of the second base station is located on a satellite.

[0023] In one embodiment, the identification information of the failed cell includes at least one of the following: a tracking area identifier of the cell, a globally unique identifier of the cell, and a physical layer identifier of the cell.

[0024] In one embodiment, the RLF report further includes: information related to the type of the failed cell, the type of the failed cell including at least one of the following: a cell corresponding to a mobile satellite, a cell corresponding to a geostationary orbit satellite, and a cell corresponding to an aircraft.

[0025] In one embodiment, the core network device includes a mobility management function entity AMF.

[0026] In one embodiment, the time information when the UE RLF occurs includes absolute time information or relative time information.

[0027] According to another aspect of the present disclosure, a method performed by a core network device in a wireless communication system is provided, comprising: receiving an eleventh message including a radio link failure RLF report from a first base station, wherein the RLF report includes the time when the RLF occurs in the UE and identification information of the failed cell; determining a second base station where the cell where the RLF occurs in the UE is located based on the identification information of the failed cell in the RLF report and the time when the RLF occurs in the UE; and sending a twelfth message including the RLF report to the second base station.

[0028] In one embodiment, the core network device includes a mobility management function entity AMF.

[0029] In one embodiment, the identification information of the failed cell includes at least one of the following: a tracking area identifier of the cell, a globally unique identifier of the cell, and a physical layer identifier of the cell.

[0030] In one embodiment, the RLF report further includes information related to the type of failed cell, where the type of failed cell includes at least one of the following: a cell corresponding to a mobile satellite, a cell corresponding to a geostationary orbit satellite, and a cell corresponding to an aircraft.

[0031] In one embodiment, the time information when the UE RLF occurs includes absolute time information or relative time information.

[0032] In one embodiment, the eleventh message further includes at least one of the following: an identifier of the destination base station; a tracking area indication of the destination base station; the time when the UE RLF occurs; an identifier of the source base station, and a tracking area indication of the source base station.

[0033] In one embodiment, the second base station is determined based on at least one of the time information when the UE has RLF, the identification information of the failed cell, and the information stored in the core network.

[0034] According to another aspect of the present disclosure, a method performed by a first base station in a wireless communication system is provided, comprising: sending a first message for requesting resource status to a second base station; receiving a second message for updating resource status from the second base station, wherein the second message includes information related to the type of cell on the second base station and time information about the existence of the cell on the second base station.

[0035] In one embodiment, the time information about the existence of the cell on the second base station includes at least one of the following: the start time of the cell, the end time of the existence of the cell, the time when the cell disappears, the next time the cell appears, the next time the cell leaves, the duration of the cell's existence, and the interruption time of the cell.

[0036] In one embodiment, the time information about the existence of the cell on the second base station includes absolute time information or relative time information.

[0037] In one embodiment, the type of the cell on the second base station includes at least one of the following: a cell corresponding to a geostationary orbit satellite, a cell corresponding to a mobile satellite, and a cell corresponding to an aircraft.

[0038] In one embodiment, the first base station includes a ground base station or a satellite base station.

[0039] In one embodiment, the first message comprises a resource status request / report message and the second message comprises a resource status update message.

[0040] In one embodiment, the method further comprises: performing a cell switching process based on the received second message.

[0041] In one embodiment, performing a cell switching process based on the received second message includes: deciding whether to switch a user equipment on the first base station to a cell of the second base station, or accepting switching of a user equipment on the second base station to a cell of the first base station, based on the received second message.

[0042] According to another aspect of the present disclosure, a method performed by a first base station in a wireless communication system is provided, comprising: sending a third message for updating a node configuration to a second base station, the third message comprising time information about the existence of a second cell different from the first cell and information related to the type of the second cell, wherein the first cell is a service cell of a user equipment UE; and receiving a fourth message for confirming the node configuration update from the second base station, the fourth message comprising identification information of a cell served on the second base station.

[0043] In one embodiment, the type of the second cell includes at least one of the following: a cell corresponding to a geostationary orbit satellite, a cell corresponding to a mobile satellite, and a cell corresponding to an aircraft.

[0044] In one embodiment, the time information about the existence of the second cell includes at least one of the following: the start time of the existence of the cell, the time when the cell leaves, the time when the cell appears next time, the time when the cell leaves next time, the duration of the existence of the cell, and the interruption time of the cell.

[0045] In one embodiment, the time information about the existence of the second cell includes absolute time information, or relative time information.

[0046] In one embodiment, the first base station includes a ground base station or a satellite base station.

[0047] In one embodiment, the third message comprises a node configuration update message, and the fourth message comprises a node configuration update confirmation message.

[0048] According to another aspect of the present disclosure, a user equipment UE is provided, comprising: a transceiver; and a processor coupled to the transceiver and configured to execute any one of the methods described above.

[0049] According to another aspect of the present disclosure, a first base station is provided, comprising: a transceiver; and a processor coupled to the transceiver and configured to execute any one of the methods described above.

[0050] According to another aspect of the present disclosure, a second base station is provided, comprising: a transceiver; and a processor coupled to the transceiver and configured to execute any one of the methods described above.

[0051] According to another aspect of the present disclosure, a core network device is provided, including: a transceiver; and a processor coupled to the transceiver and configured to execute any one of the methods described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is the system architecture diagram for System Architecture Evolution (SAE);

[0053] Figure 2 This is a schematic diagram of the initial overall architecture of 5G;

[0054] Figure 3 A method 1 for supporting self-configuration / self-optimization according to an embodiment of the present disclosure;

[0055] Figure 4 A second method for supporting self-configuration / self-optimization according to an embodiment of the present disclosure;

[0056] Figure 5 A third method for supporting self-configuration / self-optimization according to an embodiment of the present disclosure;

[0057] Figure 6 A fourth method for supporting self-configuration / self-optimization according to an embodiment of the present disclosure;

[0058] Figure 7 is a block diagram of a network node in a network according to an embodiment of the present disclosure;

[0059] Figure 8 A block diagram of a user equipment UE according to the present disclosure. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0061] Before carrying out the description of the following specific embodiments, it may be advantageous to elaborate on the definitions of certain words and phrases used throughout this patent document.The term "coupling" and its derivatives refer to any direct or indirect communication between two or more elements, regardless of whether these elements are in physical contact with each other.The terms "send", "receive" and "communication" and their derivatives cover direct and indirect communication.The terms "include" and "comprise" and their derivatives mean including but not limited to.The term "or" is inclusive, meaning and / or.The phrase "associated with..." and its derivatives mean including, included in, connected to, interconnected with, included in, connected to or connected with, coupled to or coupled with, can communicate with, collaborate with, interweave, juxtapose, approach, bind to or bind with, have, have... attributes, have... relationships or have relationships with, etc.The term "controller" means any device, system or part thereof that controls at least one operation.Such a controller can be implemented in hardware, or implemented in a combination of hardware and software and / or firmware.The functions associated with any particular controller can be centralized or distributed locally or remotely. The phrase "at least one of" when used with a list of items means that different combinations of one or more of the listed items may be used, and only one item in the list may be needed. For example, "at least one of A, B, and C" includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C. For example, "at least one of A, B, or C" includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C.

[0062] In addition, the various functions described below can be implemented or supported by one or more computer programs, each of which is formed by a computer-readable program code and embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, processes, functions, objects, classes, instances, related data or parts thereof suitable for implementation in a suitable computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code and executable code. The phrase "computer-readable medium" includes any type of medium that can be accessed by a computer, such as a read-only memory (ROM), a random access memory (RAM), a hard drive, a compact disc (CD), a digital video disc (DVD) or any other type of memory. "Non-transitory" computer-readable media excludes wired, wireless, optical or other communication links that transmit temporary electrical signals or other signals. Non-transitory computer-readable media include media that can permanently store data and media that can store and rewrite data later, such as rewritable optical discs or erasable memory devices.

[0063] The terms used to describe the embodiments of the present application are not intended to limit and / or define the scope of the present application. For example, unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be the common meanings understood by people with ordinary skills in the field to which the present application belongs.

[0064] It should be understood that the words "first", "second" and the like used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Unless the context clearly indicates otherwise, the singular forms "a", "an" or "the" and the like do not indicate quantity limitation, but indicate the presence of at least one.

[0065] As used herein, any reference to "one example" or "example", "one embodiment" or "embodiment" means that a particular element, feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment. The phrases "in one embodiment" or "in an example" appearing in different places in the specification do not necessarily all refer to the same embodiment.

[0066] As used herein, "a portion" of something means "at least some" of that thing, and thus may mean less than all of that thing or all of that thing. Thus, "a portion" of a thing includes the entire thing as a special case, i.e., the entire thing is an example of a portion of a thing.

[0067] It will be further understood that the terms "include" or "comprises" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0068] The various embodiments discussed below for describing the principles of the present disclosure in this patent document are for illustration only and should not be interpreted in any way as limiting the scope of the present disclosure. Those skilled in the art will understand that the principles of the present disclosure can be implemented in any appropriately arranged wireless communication system. For example, although the following detailed description of the embodiments of the present disclosure will be directed to LTE and 5G communication systems, those skilled in the art will understand that the main points of the present disclosure can also be applied to other communication systems with similar technical backgrounds and channel formats after slight modifications without substantially departing from the scope of the present disclosure. The technical solutions of the embodiments of the present application can be applied to various communication systems, for example, the communication system may include a global system for mobile communications (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) system, a general packet radio service (GPRS), a long term evolution (LTE) system, a LTE frequency division duplex (FDD) system, a LTE time division duplex (TDD) system, a universal mobile communication system

[0069] (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (WiMAX) communication system, fifth generation (5G) system or new radio (NR), etc. In addition, the technical solutions of the embodiments of the present application can be applied to future-oriented communication technologies. In addition, the technical solutions of the embodiments of the present application can be applied to future-oriented communication technologies.

[0070] The following description with reference to the accompanying drawings is provided to facilitate a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. This description includes various specific details to facilitate understanding but should be considered as exemplary only. Therefore, one of ordinary skill in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, for the sake of clarity and conciseness, descriptions of well-known functions and structures may be omitted.

[0071] The terms and expressions used in the following specification and claims are not limited to their dictionary meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it should be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustration purposes only and not for the purpose of limiting the present disclosure as defined in the appended claims and their equivalents.

[0072] It should be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0073] The term "include" or "may include" refers to the presence of the corresponding disclosed functions, operations or components that can be used in various embodiments of the present disclosure, rather than limiting the presence of one or more additional functions, operations or features. In addition, the term "include" or "have" may be interpreted as indicating certain characteristics, numbers, steps, operations, constituent elements, components or combinations thereof, but should not be interpreted as excluding the possibility of the presence of one or more other characteristics, numbers, steps, operations, constituent elements, components or combinations thereof.

[0074] The term "or" used in various embodiments of the present disclosure includes any of the listed terms and all combinations thereof. For example, "A or B" may include A, may include B, or may include both A and B.

[0075] Unless defined differently, all terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as understood by those skilled in the art described in the present disclosure. Common terms as defined in dictionaries are interpreted as having meanings consistent with the context in the relevant technical field, and should not be interpreted ideally or overly formally unless clearly defined in the present disclosure.

[0076] The following discussion Figures 1 to 8 The various embodiments used to describe the principles of the present disclosure in this patent document are for illustration only and should not be interpreted in any way as limiting the scope of the present disclosure. Those skilled in the art will appreciate that the principles of the present disclosure can be implemented in any appropriately arranged system or device.

[0077] Figure 1 It is an exemplary system architecture 100 of System Architecture Evolution (SAE). User Equipment (UE) 101 is a terminal device used to receive data. Evolved Universal Terrestrial Radio Access Network (E-UTRAN) 102 is a radio access network, which includes a macro base station (eNodeB / NodeB) that provides a wireless network interface for the UE to access. The Mobility Management Entity (MME) 103 is responsible for managing the mobility context, session context and security information of the UE. The Serving Gateway (SGW) 104 mainly provides user plane functions, and the MME 103 and SGW 104 may be in the same physical entity. The Packet Data Network Gateway (PGW) 105 is responsible for functions such as billing and lawful interception, and may also be in the same physical entity as the SGW 104. The Policy and Charging Rules Function Entity (PCRF) 106 provides Quality of Service (QoS) policies and charging criteria. The General Packet Radio Service Support Node (SGSN) 108 is a network node device that provides routing for data transmission in the Universal Mobile Telecommunications System (UMTS). The Home Subscriber Server (HSS) 109 is the home subsystem of the UE and is responsible for protecting user information including the current location of the user equipment, the address of the service node, user security information, and the packet data context of the user equipment.

[0078] Figure 2 is an exemplary system architecture 200 according to various embodiments of the present disclosure. Other embodiments of the system architecture 200 can be used without departing from the scope of the present disclosure.

[0079] User equipment (UE) 201 is a terminal device used to receive data. The next generation radio access network (NG-RAN) 202 is a radio access network, which includes a base station (gNB or eNB connected to the 5G core network 5GC, the eNB connected to the 5GC is also called ng-gNB) that provides the UE with an access wireless network interface. The access control and mobility management function entity (AMF) 203 is responsible for managing the mobility context and security information of the UE. The user plane function entity (UPF) 204 mainly provides user plane functions. The session management function entity SMF 205 is responsible for session management. The data network (DN) 206 includes services such as operators, Internet access, and third-party services.

[0080] Exemplary embodiments of the present disclosure are further described below in conjunction with the accompanying drawings.

[0081] The text and drawings are provided as examples only to help understand the present disclosure. They should not be interpreted as limiting the scope of the present disclosure in any way. Although certain embodiments and examples have been provided, it will be apparent to those skilled in the art based on what is disclosed herein that the embodiments and examples shown may be changed without departing from the scope of the present disclosure.

[0082] In a satellite-based communication system, a base station can be located on the ground, or on a satellite, or part of the base station's functions are on the satellite and part of the base station's functions are on the ground. Due to the introduction of satellite equipment, the communication system process needs to be enhanced, for example, resource reporting, coverage modification, or radio link failure (RLF) reporting may need to be enhanced. In this case, how to support self-configuration and / or self-optimization is a problem that needs to be solved at present.

[0083] Therefore, the problems to be solved by the present disclosure include at least one of the following: how to enhance resource reporting, how to enhance coverage modification, and how to enhance wireless link failure reporting. Specifically, the present disclosure can solve at least one of the following problems or achieve at least one of the following objectives:

[0084] 1. When base station 1 requests base station 2 to report resources, an enhanced resource reporting method is provided.

[0085] 2. When base station 1 configures coverage modification, a coverage modification enhancement method is provided.

[0086] 3. When a UE experiences a radio link failure or a handover failure at a certain base station, how to notify the base station of the relevant information of the radio link failure or the handover failure so that the base station can optimize its own parameter configuration.

[0087] The present disclosure provides a method for supporting self-configuration / self-optimization, which can achieve at least one of the following effects:

[0088] Through a method disclosed in the present invention, base station 1 can obtain the time information and / or cell type-related information of the serving cell on base station 2, and refer to the time information and / or cell type-related information to decide whether to switch the UE to the cell on base station 2, or can refer to the time information and / or cell type-related information to prepare for accepting the switching of the user equipment on base station 2 to the cell on base station 1, thereby improving the success rate and efficiency of the switching.

[0089] Through another method disclosed in the present invention, base station 2 can learn the time and / or cell type of a new cell (which may also be referred to as a second cell in the context) that replaces the service cell (which may also be referred to as a first cell in the context) on base station 1. Base station 2 refers to the time information and / or information related to the cell type, and can decide to switch the UE to the new cell of base station 1 at an appropriate time, or can refer to the time information to prepare for accepting the switching of the UE from the old cell of base station 1, thereby improving the success rate and efficiency of the switching.

[0090] Through another method disclosed in the present invention, through the time information and / or cell type carried in the RLF report, the base station can correctly identify the node where the failure occurred and the cause of the RLF, so as to reasonably optimize the switching related parameters or cell reselection parameters. After the optimization, the success rate of the switching can be improved and the occurrence of RLF can be reduced.

[0091] Exemplary embodiments of the present disclosure are further described below in conjunction with the accompanying drawings.

[0092] The text and drawings are provided as examples only to help understand the present disclosure. They should not be interpreted as limiting the scope of the present disclosure in any way. Although certain embodiments and examples have been provided, it will be apparent to those skilled in the art based on what is disclosed herein that the embodiments and examples shown may be changed without departing from the scope of the present disclosure.

[0093] NR and LTE in the following description are merely examples of different radio access technologies (RATs), and may also be other RATs, to which the present disclosure is not limited. In this embodiment, the first base station may represent base station 2. The second base station may represent base station 1.

[0094] An example of the method 1 for supporting self-configuration / self-optimization in the present disclosure is as follows: Figure 3As shown. Through the method, base station 1 can learn the time information and / or cell type of the serving cell on base station 2, and refer to the time information and information related to the cell type to decide whether to switch the UE to the cell on base station 2, or refer to the time information to prepare for the handover of the user equipment on base station 2 to the cell on base station 1, thereby improving the success rate and efficiency of the handover. The method includes the following steps:

[0095] Step 301: Base station 1 sends a first message to base station 2. The first message may be used to request resource status, and may include but is not limited to a resource status request / report message.

[0096] In various embodiments, the first message may include at least one of the following: a measurement identifier, a reporting feature, configuration of which cells or which synchronization signals and physical broadcast channel blocks (Synchronization Signal and PBCH Block, SSB for short; Physical Broadcast Channel, PBCH) within the cell need to be sent to the base station 1 for reporting, and configuration of the reporting period.

[0097] Exemplarily, the measurement identifier may be an integer value, used to identify the measurement and report configured by the resource status report. The measurement identifier may be allocated by base station 1.

[0098] Exemplarily, the reporting feature may indicate objects that the base station 2 needs to measure and report, such as the base station 2 may be instructed to report on the use of PRBs, the number of activated users, and so on.

[0099] Exemplarily, the reporting characteristics may include at least one of the following: periodic reporting; event-triggered reporting; physical resource block (PRB) periodic reporting; transport network layer (TNL) capacity periodic reporting; number of user devices; and periodic reporting of activated user devices.

[0100] Step 302: Base station 2 sends a second message to base station 1. For example, the second message may be used to update resource status, and may include but is not limited to a resource status update message.

[0101] If base station 2 is a satellite base station, for example, base station 2 is connected to a satellite and transparently forwards the data of the base station through the satellite, or base station 2 is located on a satellite, or part of the functions of base station 2 are located on a satellite. When base station 2 is a satellite base station and the satellite transparently forwards data, the cell on base station 2 follows the movement of the satellite and will be served by another base station, or when base station 2 is located on a satellite, or part of the functions are located on a satellite, the cell on base station 2 will move with the satellite, so that the distance between base station 2 and base station 1 will change, and the cell on base station 2 may change from a neighboring cell of base station 1 to a non-neighboring cell of base station 1. Base station 1 can be a ground base station or another satellite base station.

[0102] Exemplarily, base station 2 refers to the relevant configuration of the report contained in the first message, and when the relevant configuration is met (for example, the satisfied configuration is a periodic configuration, or the satisfied configuration is a configuration triggered by an event), base station 2 sends a second message to base station 1.

[0103] The second message may include at least one of the following: a measurement identifier allocated by the base station 2 ; information related to the cell type on the base station 2 ; resource measurement information of the cell; and time information of the cell existance on the base station 2 .

[0104] Exemplarily, based on the reporting characteristics configured by base station 1, the resource measurement information of the cell may include at least one of the following: the wireless resource usage of the cell, the wireless resource usage of SSB, the transport layer capacity indication information, the cell capacity level, and the number of active UEs.

[0105] Exemplarily, the information related to the cell type may be information indicating that the cell is a satellite cell, or information indicating a specific type of the cell, where the specific type of the cell may be information indicating a ground-based stationary satellite (e.g., a geostationary Earth Orbit (GEO) satellite, or a mobile satellite, such as a low Earth orbit satellite (LEO)).

[0106] Exemplarily, the existence time of the cell on base station 2 refers to the time when the cell can serve as the service cell of base station 2, or it can be the time when the cell serves as a neighboring cell of the cell on base station 1. As the satellite moves, the cell will be connected to other ground equipment or gateways, that is, connected to other base stations, serving as the service cell of other base stations. The moment when the cell is no longer the service cell of base station 2 is the end time or the departure time of the cell, that is, the end time or the departure time of the cell as a neighboring cell of the cell on base station 1. The existence time of the cell can be indicated by the start time (start time) and the end time (end time) of the cell, or the existence time of the cell can be indicated by the end time of the cell. The time can be an absolute time, after which the cell is no longer the service cell of base station 2.

[0107] The time information may be embodied in various forms, such as the start time of the cell's existence, the time when the cell leaves, the time when the cell appears next time, the time when the cell leaves next time, the duration of the cell's existence, the break / discontinue time of the cell (for example, the time from when the cell stops being a service cell on base station 2 to when the cell becomes a service cell of base station 2 again), etc. The time information may be absolute time information or relative time information.

[0108] Exemplarily, when base station 1 receives the resource measurement information and cell existence time information of the cell in the second message, it can refer to the time information and information related to the cell type to decide whether to switch the UE to the cell on base station 2, or it can refer to the time information and the information on the number of users to prepare for accepting the switching of the user equipment on base station 2 to the cell on base station 1, thereby improving the success rate and efficiency of the switching. For example, referring to the time when the cell disappears, since the cell on base station 2 will disappear after a certain time, base station 1 can make a pre-judgment that base station 2 may switch some user equipment on the cell on base station 2 to the cell on base station 1, or base station 1 can reserve some resources for users on base station 2 according to the time when the cell disappears. Or when base station 1 switches the user equipment of the cell on base station 1 to base station 2, it refers to the resource measurement information and time information of the cell sent by base station 2. For example, if it is found through the time when the cell leaves that the cell on base station 2 will soon leave base station 2, base station 1 does not switch the user on the cell on base station 1 to the cell on base station 2.

[0109] The present disclosure supports an example of a second method of self-configuration / self-optimization. Figure 4As shown. Through the method, base station 2 can learn the time and / or cell type of the new cell that replaces the service cell on base station 1. Base station 2 refers to the time information and / or information related to the cell type to decide that the UE switches to the new cell of base station 1 at an appropriate time, or can refer to the time information to prepare for the handover of the UE from the old cell of base station 1, thereby improving the success rate and efficiency of the handover. The service cell of the UE can be identified as the first cell, and the new cell can be identified as the second cell. The method includes the following steps:

[0110] Step 401: Base station 1 sends a third message to base station 2. The third message may be used to update node configuration, and may be, but is not limited to, a node configuration update message.

[0111] Each base station is configured with several optional coverage configuration information, which contains coverage-related wireless parameters and the adjustable range of parameters. The base station can automatically adjust and decide which coverage configuration information to use. When the coverage configuration information changes, the base station sends a node configuration update message to the neighboring base stations.

[0112] In various embodiments, the third message may include at least one of the following: a coverage update list; coverage status indication information of the current cell; cell information corresponding to the new coverage cell that replaces the old coverage cell; information related to the type of the new cell; and time information of the new cell. The third message can be used by base station 2 to decide when the UE switches to the new cell or when to accept the switch from the old cell. More specifically, the time information and / or cell type-related information in the third message can be used by base station 2 to decide at an appropriate time to switch the UE to the new cell of base station 1, or the time information can be referred to to prepare for accepting the switch of the UE from the old cell of base station 1, thereby improving the success rate and efficiency of the switch.

[0113] The coverage update list includes the unique identifier of the current cell, which is the identifier of the currently covered cell and the identifier of the cell to be modified. Specifically, the coverage status indication information of the current cell can indicate the set of coverage configuration parameters corresponding to the current cell. Specifically, the cell information corresponding to the new coverage cell can include the unique identifier of the new cell that replaces the old cell, and the SSB coverage modification list, wherein the SSB coverage modification list includes a set of information about the SSB to be modified. Specifically, the SSB coverage modification information can include at least one of the SSB index and the coverage status indication information of the SSB, wherein the coverage status indication information of the SSB indicates whether the SSB is in an activated state and indicates the corresponding coverage configuration. The coverage status indication information of the SSB can indicate a set of parameters for the SSB coverage configuration, and the receiving base station 2 can obtain the configuration of the SSB used by the base station 1 through the coverage status indication information of the SSB, and the receiving base station 2 can obtain the parameters related to the SSB configuration switching indicated by the SSB index.

[0114] In one embodiment, the type-related information of the new cell may include indication information that the new cell is a satellite cell, or include the specific type of the cell, for example, the cell is a low-orbit satellite LEO, a geostationary orbit satellite GEO, an aircraft, or the like.

[0115] In one embodiment, the time information of the existence of the new cell refers to the time when the cell can be used as a cell on the base station 1. When the base station 1 is a satellite base station (including a transparent mode in which the base station is located on the ground and forwards data through a satellite, and also including a non-transparent mode in which the base station function or part of the base station function is located on the satellite, also known as a bent pipe mode), the cell on the base station follows the satellite and moves to another area. The original area is served by a new cell. The time from the time when the new cell provides services in the area to the time when the new cell moves to another area is the time when the cell exists. The time information can be embodied in multiple forms, for example, including the start time of the cell existence, the time when the cell leaves, the time when the cell appears next time, and the time when the cell leaves next time. The start time of the cell existence, the duration of the cell existence (duration), the time when the cell leaves, the interruption time of the cell, etc. The time information can be absolute time information or relative time information. The cell existence time information allows the base station to know when the cell can be used as a new service cell for the UE and when it cannot be used as a new service cell for the UE, thereby determining the next switching process, deciding the next action, and improving the success rate and efficiency of the switching. .

[0116] Step 402: Base station 2 sends a fourth message to base station 1. The fourth message may be, but is not limited to, a node configuration update confirmation message.

[0117] The fourth message may include information of a cell served by base station 2. The cell information may include at least one of the following: a cell unique identifier, a cell tracking area code (TAC), a broadcast operator identifier, uplink and downlink frequency information, and the like.

[0118] Base station 2 can refer to the time information of the cell existence and / or the information related to the cell type in the received third message to decide at an appropriate time for the UE to switch to the new cell of base station 1, or can refer to the time information to prepare for accepting the switching of the UE from the old cell of base station 1, thereby improving the success rate and efficiency of the switching.

[0119] The present disclosure supports an example of a third method of self-configuration / self-optimization. Figure 5 As shown. In this embodiment, the UE may send an RLF report to the base station. Through the time information and / or cell type carried in the RLF report, the base station can correctly identify the node where the failure occurs and the cause of the RLF, so as to reasonably optimize the switching related parameters or cell reselection parameters. After the optimization, the success rate of the switching can be improved and the occurrence of RLF can be reduced. In this embodiment, base station 1 and base station 2 can be base stations supporting the same or different wireless access technologies or base stations of different systems. For example, base station 1 can be a base station supporting NR, a base station supporting NG-RAN, a base station supporting LTE or a base station supporting E-UTRAN, and base station 2 can be a base station supporting NR, a base station supporting NG-RAN, a base station supporting LTE or a base station supporting E-UTRAN. In this embodiment, base station 1 can be connected to a satellite, and the satellite is in transparent mode. The satellite forwards data between UE and base station 1 in a transparent transmission manner. Base station 2 can be a base station located on the ground or on a satellite.

[0120] In this embodiment, when the network configures the UE to perform conditional switching, the network configures the UE to configure a time-based or location-based trigger condition and a measurement-based trigger condition (e.g., one of the conditional switching events A3 / A4 / A5) together. When sending the RLF report, it also carries indication information, which indicates the type of execution condition of the UE conditional switching, that is, it indicates which trigger condition the UE uses to perform conditional switching when RLF occurs before and after the switching.

[0121] The method comprises the following steps:

[0122] Step 501, a radio link failure (RLF) occurs in the cell of base station 1 of the UE, and an RLF report is generated and saved. In the following description, radio link failure (RLF) may also refer to a handover failure, and information related to the RLF failure may also include information on the handover failure. The UE saves the radio link failure information or the handover failure information in the RLF report variable. The UE records the time when the radio link failure occurs in the UE, and saves the time of the failure in the RLF report. The UE may also record the type of the failed cell, such as whether the cell is a satellite cell, whether the cell is a low-orbit satellite LEO, a geostationary orbit satellite GEO, an aircraft, and other specific types, and saves the above information in the RLF report. The UE saves the RLF report until the network requests the UE to report the RLF report, or if a certain time has passed, such as 48 hours without being requested by the network, the UE will delete the saved RLF report.

[0123] In various embodiments, the RLF report may include at least one of the following information: measurement results of the serving cell, measurement results of the neighboring cell, failed cell identification information, re-established cell identification information, UE identification, type of connection failure, cause of RLF, time from receipt of the RRC reconfiguration message containing the handover command to failure of the connection, cell identification information of the previous primary cell, identification information of the previous NR primary cell, reconnection cell identification information, time information of UE RLF occurrence, and type of failed cell. The time information of UE RLF occurrence and / or type of failed cell carried in the RLF report can enable the base station to correctly identify the node where the failure occurs and the cause of RLF occurrence, so as to reasonably optimize the handover-related parameters or cell reselection parameters. After optimization, the success rate of handover can be improved and the occurrence of RLF can be reduced.

[0124] The cell identification information may include a global cell identification, a tracking area code where the cell is located, a physical cell identification, and / or frequency information.

[0125] The measurement results of the serving cell or the neighboring cell may include the measurement results of the NR cell, the Evolved Universal Terrestrial Radio Access (E-UTRA) cell and other radio access technology cells, and the present disclosure does not limit this. For example, the measurement results of the serving cell or the neighboring cell may also include the measurement results of the UE on the serving cell or the surrounding cell when a radio link failure occurs.

[0126] In one embodiment, the UE identifier may be a Cell-Radio Network Temporary Identifier (C-RNTI) allocated to the UE by a serving cell.

[0127] In one embodiment, the type of connection failure can be set to wireless link failure, handover failure, etc.

[0128] In one embodiment, the cause of the RLF may be set to a random access problem, a maximum retransmission of a radio link control (Radio Link Control, RLC), a beam failure, and the like.

[0129] The time when the UE RLF occurs may be absolute time information or relative time information.

[0130] The type of the failed cell may indicate that the cell is a satellite cell, or the cell is a specific type such as a cell corresponding to a low-orbit satellite LEO, a cell corresponding to a geostationary orbit satellite GEO, or a cell corresponding to an aircraft.

[0131] In some examples, the RLF report may also include indication information, indicating which trigger condition the UE used to perform conditional switching when RLF occurred, or may indicate conditional switching without any trigger condition. The indication information may be set to be based on time, location, or measurement. Specifically, the UE performs conditional switching, the measurement trigger condition of the triggered condition meets the execution condition of the switching, or the time meets the switching execution condition, or the location meets the switching execution condition, the UE selects a candidate cell as the service cell, and in the new service cell, for example, the service cell is located on base station 1, the UE has an RLF, the UE report information is included in the RLF report, and the RLF report includes indication information, indicating that the UE performs conditional switching because the execution condition triggered by time is met, or the execution condition triggered by location is met, or the execution condition triggered by measurement is met. It can further be indicated that the measurement condition switching event is one of A3 / A4 / A5.

[0132] In some examples, if after the conditional handover is executed, the UE has an RLF in the target cell, the target cell is in base station 1, and then the UE selects another cell for radio resource control connection, the other cell is located on base station 2, if the other cell is the source cell that was previously switched, that is, the UE has an RLF soon after the conditional handover, and reselects to the source cell, it means that the conditional handover execution condition (CHO Execution) is set unreasonably, which triggers the too early conditional handover execution, the source cell (that is, the cell on base station 2) receives the RLF report, and learns which execution condition of the conditional handover is, the source base station can detect the error cause of the RLF, adjust the relevant configuration parameters of the execution condition, for example, the indication information indicates that the conditional handover execution satisfies the execution condition of the measurement trigger, then the source base station needs to adjust the relevant configuration parameters of the conditional handover based on the measurement trigger, and so on, the source base station can adjust the relevant configuration parameters of the execution conditions of other triggering conditional handovers. At this time, base station 2 analyzes the cause of the RLF and makes corresponding adjustments, 504 in this embodiment does not need to be executed, and base station 1 in step 505 is replaced by base station 2.

[0133] In some examples, if after the conditional handover is executed, the UE has an RLF in the destination cell, the destination cell is on base station 1, and then the UE selects another cell for radio resource control connection, the other cell is located on base station 2, if the other cell is not the source cell that was previously switched, that is, the UE quickly RLFs after the conditional handover, and reselects to the third cell, it means that the conditional handover execution condition is set unreasonably, causing the conditional handover to the wrong cell. At this time, the RLF report finally needs to be obtained by the base station where the source cell is located. Assuming that the source cell is on base station 3, base station 1 in steps 504 and 505 is replaced by base station 3. The source cell receives the RLF report and learns which execution condition of the conditional handover is. The source base station can detect the cause of the RLF error and adjust the relevant configuration parameters of the execution condition. For example, if the indication information indicates that the conditional handover execution satisfies the execution condition of the measurement trigger, the source base station needs to adjust the relevant configuration parameters of the conditional handover based on the measurement trigger. By analogy, the source base station can adjust the relevant configuration parameters of the execution conditions of other triggering conditional handovers.

[0134] In some examples, if the UE has not triggered the conditional handover when the RLF occurs, the UE has an RLF in the source cell, the source cell is on base station 1, and the cell is the source cell of the handover. The UE reconnects to another cell, that is, the cell on base station 2. The UE sends an RLF report to base station 2, and base station 2 sends the RLF report to base station 1. The RLF report does not contain the indication information, or contains the indication information, and the indication information indicates that the conditional handover is not triggered. According to the context information of the UE and the RLF report, base station 1 knows that two execution conditions of conditional handover are configured for the UE. If the RLF does not contain the indication information, or the indication information indicates that the conditional handover is not triggered, it means that the two triggering conditions do not trigger the execution of the conditional handover in time, and the two triggering conditions are set unreasonably, which leads to the execution of the conditional handover too late. The source base station receives the RLF report, and the source base station can detect the error cause of the RLF and adjust the relevant configuration parameters of the execution conditions. At this time, the parameters related to the execution conditions of the two conditional handovers should be adjusted. Step 502, the UE establishes a radio resource control (RRC) connection with the cell on base station 2.

[0135] Exemplarily, the UE sends an RRC connection request or an RRC connection re-establishment request message to base station 2. Base station 2 sends an RRC connection establishment or an RRC connection re-establishment message to the UE. The UE sends an RRC connection establishment completion or an RRC connection re-establishment completion message to base station 2. Base station 2 may be a first base station.

[0136] The RRC connection establishment complete or RRC connection re-establishment complete message may include RLF available information. If there is information indicating radio link failure or handover failure in the RLF report variable and the registered public land mobile network (PLMN) is included in the PLMN identifier list of the saved RLF report variable, the RRC connection establishment complete or RRC connection re-establishment complete message may include RLF available indication information. The RLF available indication information may include information indicating radio link failure or handover failure.

[0137] If the RLF report variable contains information indicating radio link failure or handover failure and the registered PLMN is included in the PLMN identification list of the saved RLF report variable, the RLF report variable may contain appropriate cell identification information or reconnected cell identification information or reestablished cell identification information.

[0138] When the re-establishment process is initiated after a mobility failure from NR occurs, the re-established cell identity information is included in the RLF report.

[0139] In some embodiments, the identification information of the suitable cell or the identification information of the reconnected cell may include a global cell identifier and / or a tracking area code (TAC) of the cell. The suitable cell or the reconnected cell is a cell suitable for UE access after NR mobility failure or a cell in which the UE successfully reconnects. The cell in which the reconnection is successful includes a cell in which the UE successfully completes the RRC reestablishment process or a cell in which the UE successfully completes the RRC connection establishment process.

[0140] Step 503: Base station 2 sends a fifth message to the UE. In one embodiment, the fifth message is used to request UE information, and may include but is not limited to a UE information request / report message.

[0141] After receiving the RLF available indication information, base station 2 sends a fifth message to the UE.

[0142] The UE sends a sixth message to the base station 2. In one embodiment, the sixth message is used to respond to the fifth message and may include a UE information request response message. The sixth message includes an RLF report. The RLF report may include at least one of the following information: measurement results of the serving cell, measurement results of the neighboring cells, failed cell identification information, re-established cell identification information, UE identification, type of connection failure, cause of RLF, time from receipt of the RRC reconfiguration message containing the handover command to failure of the connection, cell identification information of the previous primary cell, previous NR primary cell identification information, reconnection cell identification information, time when the UE had RLF, and type of failed cell. The failed cell identification information in the sixth message can be used by the base station 2 to find the base station where the failure occurred.

[0143] In one embodiment, the cell identification information may include a global cell identification, a tracking area code where the cell is located, a physical cell identification, and / or frequency information.

[0144] In one embodiment, the measurement results of the serving cell or the neighboring cell may include the measurement results of the NR cell, the Evolved Universal Terrestrial Radio Access (E-UTRA) cell and other radio access technology cells, and the present disclosure does not limit this. For example, the measurement results of the serving cell or the neighboring cell may also include the measurement results of the UE on the serving cell or the surrounding cell when a radio link failure occurs.

[0145] In one embodiment, the UE identifier may be a Cell-Radio Network Temporary Identifier (C-RNTI) allocated to the UE by a serving cell.

[0146] In one embodiment, the type of connection failure can be set to wireless link failure, handover failure, etc.

[0147] In one embodiment, the cause of the RLF may be set to a random access problem, a maximum retransmission of a radio link control (Radio Link Control, RLC), a beam failure, and the like.

[0148] The time when the UE RLF occurs may be absolute time information or relative time information.

[0149] The type of the failed cell may indicate that the cell is a satellite cell, or the cell is a specific type such as a low-orbit satellite LEO, a geostationary orbit satellite GEO, or an aircraft.

[0150] Step 504: Base station 2 sends a seventh message to base station 1. The seventh message may include the RLF report received by base station 2.

[0151] Base station 2 sends the received RLF report to the base station where the cell where the failure occurred is located, where the base station where the cell where the failure occurred is base station 1. Base station 1 can be a base station supporting the same wireless access technology as base station 2 or a base station supporting a different wireless access technology. Base station 1 can be a base station supporting the same access system as base station 2 or a base station under a different access system.

[0152] Based on the failed cell identification information, base station 2 can find the base station where the failure occurs, which is base station 1. Base station 2 sends the RLF report received from the UE to base station 1 through the inter-base station interface, or sends the RLF report received from the UE to base station 1 through the core network.

[0153] If base station 2 and base station 1 are base stations under the same access system, for example, both are E-UTRAN base stations, base station 2 can send an RLF report to base station 2 via an RLF indication message of an inter-base station interface. Base station 1 can also send an RLF report to base station 2 via other inter-base station interface messages.

[0154] If there is no interface between base station 2 and base station 1 or base station 2 and base station 1 are base stations of different systems, base station 2 sends the RLF report to base station 1 through the core network device. That is, base station 2 sends the RLF report to the core network device connected to base station 2, and the core network forwards the RLF to the core network device connected to base station 1, and then the core network device connected to base station 1 sends the RLF report to base station 2.

[0155] Step 505: Base station 1 analyzes the RLF report and optimizes configuration parameters.

[0156] Exemplarily, based on the cell identifier of the failed cell included in the RLF report, the base station 1 knows which cell has experienced a radio link failure, what type of failure has occurred, the measurement information of the cell at the time of the failure and the measurement information of the surrounding cells. Based on the time when the UE has experienced RLF included in the RLF report, combined with the ephemeris information stored on the base station 1, the base station 1 can know which satellite provided coverage for the UE when the failure occurred. The base station 1 detects the cause of the RLF and adjusts the configuration parameters with the satellite, such as optimizing the transmission power with the satellite, adjusting the switching parameters from the cell corresponding to the satellite to the cell on the base station 2 when the satellite is connected to the base station 1, etc. The time information of the UE experiencing RLF and / or the type of the failed cell carried in the RLF report can enable the base station 1 to correctly identify the node where the failure occurred and the cause of the RLF, so as to reasonably optimize the switching related parameters or the cell reselection parameters. After the optimization, the success rate of the switching can be improved and the occurrence of RLF can be reduced.

[0157] Exemplarily, base station 1 learns which trigger condition related configuration caused the failure based on the indication information contained in the RLF report, and accordingly can adjust the specific configuration parameters of the trigger condition indicated by the indication information. For example, when the indication fails, the conditional switching of the UE is based on time. Then base station 1 determines that the time window start time or the window length is not properly set based on the saved information and the information in the RLF report, and the switching is triggered prematurely, resulting in failure. In this way, the parameters related to the time-based conditional switching can be adjusted, and another trigger condition does not cause the failure and does not need to be adjusted. In this way, the cause of the error can be accurately identified to avoid the next failure caused by the trigger condition.

[0158] The present disclosure supports an example of a fourth method of self-configuration / self-optimization. Figure 6As shown. In this embodiment, the UE may send an RLF report to the base station. The time information and / or cell type carried in the RLF report may enable the base station to correctly identify the node where the failure occurs and the cause of the RLF, so as to reasonably optimize the switching related parameters or the cell reselection parameters. After the optimization, the success rate of the switching may be improved and the occurrence of RLF may be reduced. In this embodiment, the base station 1 and the base station 2 may be base stations supporting the same or different wireless access technologies or base stations of different systems. For example, the base station 1 may be a base station supporting New Radio (NR), a base station of New Radio-Radio Access Network (NG-RAN), a base station of Long-term Evolution (LTE) or a base station of E-UTRAN, and the base station 2 may be a base station supporting NR, a base station supporting NG-RAN, a base station supporting LTE or a base station supporting E-UTRAN. The base station 1 may be located on a satellite, or part of the functions of the base station 1 may be on a satellite. The satellite is in a non-transparent mode, also known as a regenerative mode. The satellite has the function of parsing and processing data, and the base station 1 sends the processed data to the UE. The base station 2 may be a base station located on the ground or on a satellite.

[0159] The method comprises the steps of:

[0160] Step 601, a radio link failure (RLF) occurs in the cell of base station 1 for the UE. The UE saves the radio link failure information or the handover failure information. In one embodiment, the UE saves the radio link failure information or the handover failure information in the RLF report variable, and the UE records the time when the radio link failure occurs, and saves the time when the failure occurs in the RLF report. In a further embodiment, the UE may also record the type of the failed cell, such as whether the cell is a satellite (e.g., a low-orbit satellite LEO or a geostationary orbit satellite GEO) cell, an aircraft cell, and other specific types, and save the above information in the RLF report. The base station correctly identifies the node where the failure occurs and the cause of the RLF, so as to reasonably optimize the handover-related parameters or the cell reselection parameters. After the optimization, the success rate of the handover can be improved and the occurrence of RLF can be reduced. Through the type of the cell, the base station can further optimize the parameters reasonably according to the type of the base station. The UE saves the RLF report until the network requests the UE to report the RLF report, or if it exceeds a certain time, such as 48 hours without being requested by the network, the UE will delete the saved RLF report. In one embodiment, the RLF report may include at least one of the following information: measurement results of the serving cell, measurement results of the neighboring cell, failed cell identification information, re-established cell identification information, UE identification, type of connection failure, cause of RLF, time from receipt of the RRC reconfiguration message containing the handover command to failure of the connection, cell identification information of the previous primary cell, previous NR primary cell identification information, reconnection cell identification information, and time when the UE experiences RLF.

[0161] Step 602: UE establishes an RRC connection with a cell on base station 2.

[0162] Exemplarily, the UE sends an RRC connection request or an RRC connection re-establishment request message to the base station 2. The base station 2 sends an RRC connection establishment or an RRC connection re-establishment message to the UE. The UE sends an RRC connection establishment completion or an RRC connection re-establishment completion message to the base station 2.

[0163] The RRC connection establishment complete or RRC connection re-establishment complete message may include RLF available information. If there is radio link failure or handover failure information in the RLF report variable and the registered PLMN is included in the PLMN identifier list of the retained RLF report variable, the RRC connection establishment complete or RRC connection re-establishment complete message may include RLF available indication information.

[0164] If there is information of radio link failure or handover failure in the RLF report variable and the registered PLMN is included in the PLMN identification list of the retained RLF report variable, appropriate cell identification information or reconnected cell identification information or reestablished cell identification information is included in the RLF report variable.

[0165] When the re-establishment process is initiated after a mobility failure from NR occurs, the re-established cell identification information may be included in the RLF report.

[0166] The suitable cell identification information or the reconnected cell identification information includes a global cell identification and / or a tracking area code (TAC) of the cell. The suitable cell or the reconnected cell is a cell suitable for UE access after failure or a cell in which the UE successfully reconnects. The reconnected cell successfully includes a cell in which the UE successfully completes the RRC reestablishment process or a cell in which the UE successfully completes the RRC connection establishment process.

[0167] Step 603: Base station 2 sends an eighth message to UE.

[0168] After receiving the RLF available indication information, base station 2 sends an eighth message to the UE. In one embodiment, the eighth message may include but is not limited to a UE information request / report message.

[0169] The UE sends a ninth message to the base station 2. In one embodiment, the ninth message can be used to respond to the UE information request, and may include but is not limited to the UE information request response message. The ninth message contains an RLF report. The RLF report contains at least one of the following information: measurement results of the serving cell, measurement results of the neighboring cell, failed cell identification information, re-established cell identification information, UE identification, type of connection failure, cause of RLF, time from the receipt of the RRC reconfiguration message containing the handover command to the failure of the connection, cell identification information of the previous primary cell, previous NR primary cell identification information, reconnection cell identification information, time when the UE radio link fails, and type of failed cell. The time information and / or cell type carried in the RLF report included in the ninth message can enable the base station 2 to correctly identify the node where the failure occurs, correctly identify the cause of the RLF, so as to reasonably optimize the handover-related parameters or cell reselection parameters. After optimization, the success rate of the handover can be improved and the occurrence of RLF can be reduced.

[0170] The cell identification information includes a global cell identification, a tracking area code where the cell is located, a physical cell identification, and / or frequency information.

[0171] The measurement results of the serving cell or the neighboring cell include the measurement results of the NR cell, the E-UTRA cell and other radio access technology cells, which are not limited in the present disclosure. The measurement results may include the measurement results of the UE on the serving cell and the surrounding cells when a radio link failure occurs.

[0172] The UE identifier may be a cell radio network temporary identifier C-RNTI allocated to the UE by a serving cell.

[0173] The type of the connection failure may be set to wireless link failure, handover failure, etc.

[0174] The cause of the RLF may be set to a random access problem, RLC maximum retransmission, beam failure, etc.

[0175] The time when the UE RLF occurs may be absolute time information or relative time information.

[0176] Step 604: Base station 2 sends a tenth message to base station 1. The tenth message may include the RLF report received by base station 2.

[0177] Base station 2 sends the received RLF report to the base station where the cell where the failure occurred is located, where the base station where the cell where the failure occurred is base station 1. The RLF report contains the identifier of the failed cell, which is on base station 1. Through the identifier of the failed cell, base station 2 can find base station 1, wherein base station 1 can be a base station that supports the same wireless access technology as base station 2 or a base station that supports a different wireless access technology, and base station 1 can be a base station in the same system as base station 2 or a base station under a different access system. In one embodiment, the identification information of the failed cell may include at least one of the following: a tracking area identifier of the cell, a globally unique identifier of the cell, and a physical layer identifier of the cell. The tracking area identifier refers to an operator identifier and a tracking area code (Tracing Area Identity) or refers to a tracking area code (Tracking Area Code).

[0178] Generally speaking, if the satellite is stationary relative to the ground, the cell identifier broadcast by the base station corresponds to the base station one-to-one. The base station can be uniquely identified through the cell identifier. According to the failed cell identifier information contained in the RLF report, base station 2 can find base station 1 where the cell where the RLF occurs is located, thereby sending the RLF to base station 1. Then, based on the time when the UE has RLF, combined with and referring to the ephemeris information saved by base station 1, base station 1 can know the cell coverage where the UE is located when the UE has RLF, that is, base station 2 is responsible for finding the cell where the RLF failure occurs and which satellite or base station where the satellite is located provides service. However, if the satellite is moving relative to the ground, the coverage of the failed cell where the RLF occurs is provided by different base stations (i.e., satellites, because the base stations are on satellites) at different times. If different base stations (i.e., satellites) provide the same coverage, the broadcast cell identifier and tracking area identifier are the same, the cell identifier is the cell's global unique identifier (Cell Global Identity) or the physical layer cell identifier (Physical Cell Identifier, PCI), and the tracking area identifier refers to the operator identifier and the tracking area code (Tracing Area Identity) or the tracking area code (Tracking Area Code). The same cell identifier and / or tracking area identifier corresponds to multiple base stations, and then based on the failed cell identifier information contained in the RLF report, base station 2 cannot correctly find the base station where the failure occurs. Therefore, base station 2 also needs to save the ephemeris information, and at the same time, based on the time of the RLF occurrence contained in the RLF report, combined with the ephemeris information, find the correct base station (i.e., satellite) serving the coverage when the RLF occurs.

[0179] After finding the correct base station, base station 2 can send the RLF report to base station 1. According to the ephemeris information, the found base station (base station 1 in this embodiment) provides the coverage corresponding to the above-mentioned UE failure cell within a certain time period, and establishes an Xn interface with base station 2. Therefore, base station 2 can send the RLF report received from the UE to base station 1 through the inter-base station interface within the said time period, that is, when base station 1 serves the above-mentioned cell coverage again.

[0180] Or when base station 2 has no Xn interface with the base station where the cell where the failure occurs is located, base station 2 needs to find the correct base station through the NG interface, and then proceed to the following steps 605 and 606. Base station 2 knows that there is no Xn interface with the base station where the failed cell is located based on the failed cell identification information included in the RLF report, and base station 2 sends a message to the core network device (such as AMF) to find the base station where the failed cell is located through the core network device.

[0181] Step 605: Base station 2 sends an eleventh message to a core network device (eg, AMF). In one embodiment, the eleventh message may include but is not limited to an uplink RAN ​​configuration transmission message.

[0182] In one embodiment, the eleventh message may carry the RLF report. For example, the RLF report may be included in the RLF report container, or the RLF is included in the tenth message, and the tenth message is carried in the eleventh message.

[0183] In various embodiments, the eleventh message may also include at least one of the following: the identifier of the destination base station, that is, the identifier of base station 1; the tracking area indication of the destination base station; the time when the UE RLF occurs; the identifier of the source base station, that is, the identifier of base station 1; and the tracking area indication of the source base station. The content of the eleventh message is used for the AMF to find the base station where the cell where the failure occurs is located and then send the RLF report to it. Specifically, the time information and / or cell type carried in the RLF report can enable base station 2 to correctly identify the node where the failure occurs.

[0184] Step 606: The core network device (eg, AMF) sends a twelfth message to base station 1. The twelfth message includes an RLF report. In one embodiment, the twelfth message includes but is not limited to a downlink RAN ​​configuration transmission message.

[0185] Generally speaking, the core network device (such as AMF) can find the base station where the cell where the failure occurs is located through the tracking area indication of the source base station and the identification of the source base station, and then the core network device (such as AMF, the following description takes AMF as an example) can send the twelfth message to base station 1, and the twelfth message can carry the RLF report. In one embodiment, base station 1 is determined by the core network device (such as AMF) based on at least one of the time information of the UE RLF occurrence in the eleventh message, the identification information of the failed cell, and the information stored by the core network device (such as AMF).

[0186] Specifically, if the coverage of the failed cell where the satellite RLF occurs is provided by different base stations (i.e., satellites, because the base stations are on the satellites) at different times, and when different base stations (i.e., satellites) provide the same coverage, the broadcast cell identifiers and / or tracking area identifiers are different, and the base stations and the broadcast cell identifiers and / or tracking area identifiers are in a one-to-one correspondence, where the cell identifier includes the base station identifier, then based on the source base station identifier or source cell identifier (or failed base station identifier, or failed cell identifier) ​​contained in the received eleventh message, and the tracking area indication of the source base station, the AMF can correctly find the base station where the failure occurred.

[0187] If the coverage of the failed cell where RLF occurs is provided by different base stations (i.e., satellites, because the base stations are on satellites) at different times, and when different base stations (i.e., satellites) provide the same coverage, the broadcast cell identifier and / or tracking area identifier is the same, and the same cell identifier and / or tracking area identifier corresponds to multiple base stations, therefore, only based on the tracking area indication of the source base station contained in the 605 message, which includes the operator identifier and tracking area code, the AMF cannot correctly find the base station where the failure occurs. At this time, the AMF needs to save the ephemeris information. According to the ephemeris information, a certain base station periodically serves the above coverage, and the base station where the cell where the UE has RLF is periodically connected to the AMF. The AMF can find the base station that periodically serves the coverage based on the time when the UE has RLF in the 605 message, combined with and referring to the ephemeris information saved by the AMF.

[0188] Or when the AMF does not save the ephemeris information, during the process of establishing the NG interface, the base station reports the coverage time period information shown by the tracking area identifier served by the base station, that is, the time information of the existence of the cell. The time period information refers to the start time and end time when the base station is connected to the AMF and serves the coverage with the tracking area identifier. When different base stations serve the coverage, the base station identifiers and / or tracking area codes (TACs) reported by different base stations are the same, but the time period information is different. The time period information may indicate the time when the base station is connected to the AMF, and the time may be a periodic time. The AMF can find the correct base station (i.e., satellite) based on the time when the UE has RLF contained in the RLF report and with reference to the time when the base station is connected to the AMF, which is base station 1 here. The AMF sends the twelfth message to base station 1, and the twelfth message may carry the RLF report.

[0189] Step 607: Base station 1 analyzes the RLF report in the twelfth message and optimizes the configuration parameters related to the failed cell. In various embodiments, adjusting the configuration parameters related to the failed cell includes adjusting the configuration parameters of the satellite where the failed cell is located, and / or adjusting the switching parameters from the failed cell to the cell on the first base station.

[0190] According to the cell identifier of the failed cell included in the RLF report, base station 1 knows which cell has experienced a radio link failure, what type of failure has occurred, the measurement information of the cell at the time of the failure and the measurement information of the surrounding cells. According to the time when the UE has experienced RLF included in the RLF report, combined with the ephemeris information stored by base station 1, base station 1 can know which satellite provided coverage for the UE when the cell failed. Base station 1 detects the cause of the RLF failure and adjusts the configuration parameters of the satellite, such as optimizing the transmission power between the satellite and adjusting the switching parameters from the cell of base station 1 to the cell on base station 2 when base station 1 is on this satellite. The time information and / or cell type carried in the RLF report can enable base station 1 to correctly identify the cell where the failure occurred and the cause of the RLF, so as to reasonably optimize the switching related parameters or cell reselection parameters. After optimization, the success rate of the switching can be improved and the occurrence of RLF can be reduced.

[0191] At this point, the description of the method for supporting self-configuration / self-optimization disclosed in the present invention is completed. This method can support the correct identification of the cause of failure when the base station is connected to a satellite or the base station is located on a satellite, so as to perform reasonable optimization, reduce the occurrence of failures, ensure business continuity, and reduce the operator's labor costs.

[0192] Figure 7 A block diagram of a network node in a network according to the present disclosure.

[0193] The network nodes in the network can be used to implement the first base station, the second base station, base station 1, base station 2, core network equipment (such as AMF), etc. in the present invention. Figure 7 , the network node according to the present invention includes a transceiver 1210 and a processor 1220, and the transceiver 1210 is coupled to the processor 1220. Optionally, the network node may further include a memory 1230. The transceiver 1210, the processor 1220 and the memory 1230 are configured to perform the operations of the method and / or embodiment of the present invention. Although the transceiver 1210, the processor 1220 and the memory 1230 are shown as separate entities, they may be implemented as a single entity, such as a single chip. The transceiver 1210, the processor 1220 and the memory 1230 may be electrically connected or coupled to each other. The transceiver 1210 may send signals to other network nodes and receive signals from other network nodes, such as UE, a first base station, a second base station, base station 1, base station 2, or a core network device (such as AMF). The processor 1220 may include one or more processing units, and may control the network node to perform operations and / or functions according to one of the above embodiments. The memory 1230 may store instructions for implementing the operations and / or functions of one of the above embodiments.

[0194] According to one aspect of the present disclosure, a method performed by a first base station in a wireless communication system is provided, comprising: sending a fifth message for requesting UE information to a user equipment UE; receiving a sixth message for responding to the fifth message from the UE, the sixth message comprising a radio link failure RLF report; and sending a seventh message comprising an RLF report to a second base station, wherein the RLF report comprises time information of when the UE experiences RLF and identification information of a failed cell.

[0195] According to another aspect of the present disclosure, a method performed by a second base station in a wireless communication system is provided, comprising: receiving a thirteenth message from a first base station or a core network device, the thirteenth message comprising a radio link failure RLF report, the RLF report comprising time information of when the UE experiences RLF and identification information of a failed cell; and adjusting configuration parameters related to the failed cell based on the received RLF report.

[0196] According to another aspect of the present disclosure, a method performed by a core network device in a wireless communication system is provided, comprising: receiving an eleventh message including a radio link failure RLF report from a first base station, wherein the RLF report includes the time when the RLF occurs in the UE and identification information of the failed cell; determining a second base station where the cell where the RLF occurs in the UE is located based on the identification information of the failed cell in the RLF report and the time when the RLF occurs in the UE; and sending a twelfth message including the RLF report to the second base station.

[0197] According to another aspect of the present disclosure, a method performed by a first base station in a wireless communication system is provided, comprising: sending a first message for requesting resource status to a second base station; receiving a second message for updating resource status from the second base station, wherein the second message includes information related to the type of cell on the second base station and time information about the existence of the cell on the second base station.

[0198] According to another aspect of the present disclosure, a method performed by a first base station in a wireless communication system is provided, comprising: sending a third message for updating a node configuration to a second base station, the third message comprising time information about the existence of a second cell different from the first cell and information related to the type of the second cell, wherein the first cell is a service cell of a user equipment UE; and receiving a fourth message for confirming the node configuration update from the second base station, the fourth message comprising identification information of a cell served on the second base station.

[0199] Figure 8 FIG. 4 is a block diagram of a user equipment UE according to the present invention.

[0200] refer to Figure 8, the UE according to the present invention includes a transceiver 1310 and a processor 1320, and the transceiver 1310 is coupled to the processor 1320. Optionally, the network node may further include a memory 1330. The transceiver 1310, the processor 1320 and the memory 1330 are configured to perform the operations of the method and / or embodiment of the present invention. Although the transceiver 1310, the processor 1320 and the memory 1330 are shown as separate entities, they can be implemented as a single entity, such as a single chip. The transceiver 1310, the processor 1320 and the memory 1330 can be electrically connected or coupled to each other. The transceiver 1310 can send signals to other network nodes and receive signals from other network nodes, such as UE, a first base station, a second base station, base station 1, base station 2, a core network device (such as AMF). The processor 1320 may include one or more processing units, and may control the UE to perform operations and / or functions according to one of the above embodiments. The memory 1130 may store instructions for implementing the operations and / or functions of one of the above embodiments.

[0201] According to one aspect of the present disclosure, a method performed by a user equipment UE in a wireless communication system is provided, comprising: generating a radio link failure RLF report, the RLF report comprising time information of the UE RLF occurrence and identification information of the failed cell; receiving a fifth message for requesting UE information from a first base station; and sending a sixth message for responding to the fifth message to the first base station, the sixth message comprising the RLF report.

[0202] According to an embodiment of the present disclosure, a computer-readable storage medium storing instructions may also be provided, wherein when the instructions are executed by at least one processor, the at least one processor is prompted to execute any one of the above methods according to the exemplary embodiments of the present disclosure. Examples of computer-readable storage media here include: read-only memory (ROM), random access programmable read-only memory (PROM), electrically erasable programmable read-only memory (EEPROM), random access memory (RAM), dynamic random access memory (DRAM), static random access memory (SRAM), flash memory, non-volatile memory, CD-ROM, CD-R, CD+R, CD-RW, CD+RW, DVD-ROM, DVD-R, DVD+R, DVD-RW, DVD+RW, DVD-RAM, BD-ROM, BD-R, BD-R LTH, BD-RE, Blu-ray or optical disk storage, hard disk drive (HDD), solid state drive (SSD), card storage (such as, multimedia card, secure digital (SD) card or extreme digital (XD) card), magnetic tape, floppy disk, magneto-optical data storage device, optical data storage device, hard disk, solid state disk and any other device, any other device is configured to store computer programs and any associated data, data files and data structures in a non-transitory manner and provide the computer programs and any associated data, data files and data structures to a processor or computer so that the processor or computer can execute the computer program. The instructions or computer programs in the above-mentioned computer-readable storage medium can be run in an environment deployed in a computer device such as a client, a host, an agent device, a server, etc. In addition, in one example, the computer program and any associated data, data files and data structures are distributed on a networked computer system, so that the computer program and any associated data, data files and data structures are stored, accessed and executed in a distributed manner by one or more processors or computers.

[0203] Those skilled in the art will appreciate that the above illustrative embodiments are described herein and are not intended to be limiting. It should be understood that any two or more of the embodiments disclosed herein may be combined in any combination. In addition, other embodiments may be utilized and other changes may be made without departing from the spirit and scope of the subject matter presented herein. It will be readily understood that the various aspects of the invention of the present disclosure as generally described herein and shown in the accompanying drawings may be arranged, replaced, combined, separated and designed in a variety of different configurations, all of which are contemplated herein.

[0204] Those skilled in the art will appreciate that the various illustrative logic boxes, modules, circuits, and steps described in the present application can be implemented as hardware, software, or a combination of the two. To clearly illustrate this interchangeability of hardware and software, various illustrative components, boxes, modules, circuits, and steps are described generally in the form of their function sets above. Whether such function sets are implemented as hardware or software depends on specific applications and the design constraints imposed on the overall system. Technicians can implement the described function sets in different ways for each specific application, but such design decisions should not be interpreted as causing a departure from the scope of the present application.

[0205] The various illustrative logic blocks, modules, and circuits described in this application may be implemented or executed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors cooperating with a DSP core, or any other such configuration.

[0206] The method described in the present application or the step of algorithm can be directly embodied in hardware, in the software module executed by the processor, or in the combination of the two. The software module can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, register, hard disk, removable disk or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read and write information from / to the storage medium. In an alternative, the storage medium can be integrated into the processor. The processor and the storage medium can reside in the ASIC. The ASIC can reside in the user terminal. In an alternative, the processor and the storage medium can reside in the user terminal as discrete components.

[0207] In one or more exemplary designs, the functions may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include both computer storage media and communication media, the latter including any media that facilitates the transfer of a computer program from one place to another. Storage media may be any available media that can be accessed by a general or special purpose computer.

[0208] The above description is merely an exemplary embodiment of the present application and is not intended to limit the protection scope of the present application. The protection scope of the present application is determined by the appended claims.

Claims

1. A method performed by a user equipment UE in a wireless communication system, comprising: Generate a radio link failure RLF report, where the RLF report includes time information of the UE RLF occurrence and identification information of the failed cell; receiving, from the first base station, a fifth message for requesting UE information; as well as A sixth message for responding to the fifth message is sent to the first base station, where the sixth message includes the RLF report.

2. The method according to claim 1, wherein the RLF report includes indication information, wherein the indication information indicates a type of execution condition of the UE conditional switching.

3. The method as claimed in claim 2, wherein the indication information can be set to be based on time, based on location or based on measurement, or to indicate conditional execution without any triggering condition switching.

4. A method performed by a first base station in a wireless communication system, comprising: Sending a fifth message for requesting UE information to the user equipment UE; Receiving, from the UE, a sixth message for responding to the fifth message, wherein the sixth message includes a radio link failure (RLF) report; as well as sending a seventh message including an RLF report to the second base station, The RLF report includes the time information when the UE has RLF and the identification information of the failed cell.

5. The method of claim 4, wherein: The second base station is determined based on at least one of the time information of the UE RLF occurrence in the RLF report, the identification information of the failed cell, and the ephemeris information stored by the first base station.

6. A method performed by a second base station in a wireless communication system, comprising: receiving a thirteenth message from the first base station or the core network device, where the thirteenth message includes a radio link failure RLF report, where the RLF report includes time information of the UE RLF occurrence and identification information of the failed cell; and Based on the received RLF report, the configuration parameters related to the failed cell are adjusted.

7. The method of claim 6, wherein: Adjusting the configuration parameters related to the failed cell also includes: Based on the ephemeris information stored by the second base station, the configuration parameters related to the failed cell are adjusted.

8. The method according to claim 6 or 7, wherein adjusting the configuration parameters related to the failed cell comprises: Adjust the configuration parameters of the satellite where the failed cell is located, and / or adjust the switching parameters from the failed cell to the cell on the first base station.

9. The method according to any one of claims 6 to 8, wherein: The second base station is connected to the satellite, or the second base station is located on the satellite, or part of the functions of the second base station is located on the satellite.

10. A method performed by a core network device in a wireless communication system, comprising: Receiving an eleventh message including a radio link failure RLF report from the first base station, wherein the RLF report includes a time when the UE has RLF and identification information of a failed cell; Determine, based on the identification information of the failed cell in the RLF report and the time when the UE has RLF, a second base station in which the cell where the UE has RLF is located; and A twelfth message including the RLF report is sent to the second base station.

11. The method of claim 10, wherein: The core network device includes a mobility management function entity AMF.

12. The method according to claim 10 or 11, wherein: The eleventh message further includes at least one of the following: an identifier of a target base station; an indication of a tracking area of ​​the target base station; a time when the UE has RLF; The identifier of the source base station and the tracking area indication of the source base station.

13. The method according to any one of claims 10 to 12, wherein: The second base station is determined based on at least one of the time information when the UE has RLF, the identification information of the failed cell, and the information stored in the core network.

14. The method of any one of claims 1, 2, 6 or 10, wherein: The identification information of the failed cell includes at least one of the following: a tracking area identifier of the cell, a globally unique identifier of the cell, and a physical layer identifier of the cell.

15. According to the method as described in any one of claims 1, 2, 6 or 10, the RLF report also includes information related to the type of failed cell, and the type of failed cell includes at least one of the following: a cell corresponding to a mobile satellite, a cell corresponding to a ground stationary orbit satellite, and a cell corresponding to an aircraft.

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