Failure processing methods and apparatuses, and storage medium

Abstract

Provided in the present disclosure are failure processing methods and apparatuses, and a storage medium. A method comprises: when it fails to execute a first cell handover mode in a first cell, executing a failure processing operation, the failure processing operation comprising any one of the following: a terminal skipping a cell search and executing RRC reconstruction in the first cell; the terminal skipping the cell search and executing a second cell handover mode in the first cell; when a cell selected by the terminal by means of the cell search is the same cell as the first cell, executing the second cell handover mode in the first cell; and the terminal executing in the first cell the second cell handover mode rather than the RRC reconstruction. The present disclosure can reduce the time delay of terminals accessing target cells, and improve NTN reliability and availability.

Description

Failure handling method and device, and storage medium Technical Field

[0001] The present disclosure relates to the field of communications, and in particular to a failure handling method and device, and a storage medium. Background Art

[0002] Currently, the 3rd Generation Partnership Project (3GPP) uses satellite communication networks as a supplement to terrestrial networks and calls them non-terrestrial networks (NTN).

[0003] Summary of the Invention

[0004] In order to reduce the delay for a terminal to connect to a target cell in an NTN, embodiments of the present disclosure provide a failure processing method and apparatus, and a storage medium.

[0005] According to a first aspect of an embodiment of the present disclosure, a failure handling method is provided, including:

[0006] If the first cell handover mode fails to be executed in the first cell, a failure handling operation is performed;

[0007] The failure handling operation includes any of the following:

[0008] The terminal skips the cell search and performs RRC reestablishment in the first cell;

[0009] The terminal skips the cell search and performs the second cell handover mode in the first cell;

[0010] When the cell selected by the terminal through the cell search is the same as the first cell, performing the second cell handover mode in the first cell;

[0011] The terminal does not perform RRC re-establishment, but performs the second cell switching mode in the first cell.

[0012] According to a second aspect of an embodiment of the present disclosure, a failure handling method is provided, including:

[0013] Sending instruction information to the terminal, where the instruction information is used to instruct the terminal to perform a failure processing operation when the first cell fails to perform the first cell handover mode;

[0014] The failure handling operation includes any of the following:

[0015] The terminal skips the cell search and performs RRC reestablishment in the first cell;

[0016] The terminal skips the cell search and performs the second cell handover mode in the first cell;

[0017] When the cell selected by the terminal through the cell search is the same as the first cell, performing the second cell handover mode in the first cell;

[0018] The terminal does not perform RRC re-establishment, but performs the second cell switching mode in the first cell.

[0019] According to a third aspect of an embodiment of the present disclosure, a terminal is provided, including:

[0020] A processing module is configured to execute a failure processing operation when the first cell handover mode fails in the first cell;

[0021] The failure handling operation includes any of the following:

[0022] The terminal skips the cell search and performs RRC reestablishment in the first cell;

[0023] The terminal skips the cell search and performs the second cell handover mode in the first cell;

[0024] When the cell selected by the terminal through the cell search is the same as the first cell, performing the second cell handover mode in the first cell;

[0025] The terminal does not perform RRC re-establishment, but performs the second cell switching mode in the first cell.

[0026] According to a fourth aspect of an embodiment of the present disclosure, a network device is provided, including:

[0027] a transceiver module configured to send indication information to a terminal, wherein the indication information is used to instruct the terminal to perform a failure processing operation when the first cell fails to perform the first cell handover mode;

[0028] The failure handling operation includes any of the following:

[0029] The terminal skips the cell search and performs RRC reestablishment in the first cell;

[0030] The terminal skips the cell search and performs the second cell handover mode in the first cell;

[0031] When the cell selected by the terminal through the cell search is the same as the first cell, performing the second cell handover mode in the first cell;

[0032] The terminal does not perform RRC re-establishment, but performs the second cell switching mode in the first cell.

[0033] According to a fifth aspect of an embodiment of the present disclosure, a terminal is provided, including:

[0034] one or more processors;

[0035] The terminal is used to execute the failure handling method described in any one of the first aspects.

[0036] According to a sixth aspect of an embodiment of the present disclosure, a network device is provided, including:

[0037] one or more processors;

[0038] The network device is used to execute the failure handling method described in any one of the second aspects.

[0039] According to a seventh aspect of an embodiment of the present disclosure, a storage medium is provided, which stores instructions, which, when the instructions are executed on a communication device, enable the communication device to execute a failure handling method as described in any one of the first aspect or the second aspect.

[0040] According to an eighth aspect of an embodiment of the present disclosure, a communication system is provided, comprising a terminal and a network device, wherein the terminal is configured to implement the failure handling method described in any one of the first aspects, and the network device is configured to implement the failure handling method described in any one of the second aspects.

[0041] In the embodiment of the present disclosure, when the terminal fails to perform the first cell switching mode in the first cell, the terminal can perform a failure processing operation to reduce the delay of the terminal accessing the target cell and improve the reliability and availability of the NTN.

[0042] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0044] FIG1 is an exemplary schematic diagram of the architecture of a communication system provided according to an embodiment of the present disclosure.

[0045] FIG2 is an exemplary interactive diagram of a failure handling method provided according to an embodiment of the present disclosure.

[0046] FIG3A is an exemplary interactive diagram of a failure handling method provided according to an embodiment of the present disclosure.

[0047] FIG3B is an exemplary interactive diagram of a failure handling method provided according to an embodiment of the present disclosure.

[0048] FIG4A is an exemplary schematic diagram of an NTN network architecture provided according to an embodiment of the present disclosure.

[0049] FIG4B is an exemplary interaction diagram of a cell switching method provided according to an embodiment of the present disclosure.

[0050] FIG4C is an exemplary interaction diagram of a conditional switching method provided according to an embodiment of the present disclosure.

[0051] FIG4D is an exemplary interaction diagram of the RRC reestablishment method provided according to an embodiment of the present disclosure.

[0052] FIG4E is an exemplary interaction diagram of the RRC reestablishment method provided according to an embodiment of the present disclosure.

[0053] FIG4F is an exemplary interaction diagram of the RRC reconfiguration method provided according to an embodiment of the present disclosure.

[0054] FIG5A is a schematic diagram of an exemplary interaction of a terminal provided according to an embodiment of the present disclosure.

[0055] FIG5B is a schematic diagram of an exemplary interaction of a network device according to an embodiment of the present disclosure.

[0056] FIG6A is a schematic diagram of an exemplary interaction of a communication device according to an embodiment of the present disclosure.

[0057] FIG6B is an exemplary interaction diagram of a chip provided according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0058] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0059] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of at least one of the associated listed items.

[0060] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various messages, these messages should not be limited to these terms. These terms are only used to distinguish messages of the same type from each other. For example, a first message may also be referred to as a second message, and similarly, a second message may be referred to as a first message without departing from the scope of this disclosure. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining."

[0061] The embodiments of the present disclosure provide a failure processing method, device, and storage medium.

[0062] In a first aspect, an embodiment of the present disclosure provides a failure handling method, including:

[0063] If the first cell handover mode fails to be executed in the first cell, a failure handling operation is performed;

[0064] The failure handling operation includes any of the following:

[0065] The terminal skips the cell search and performs RRC reestablishment in the first cell;

[0066] The terminal skips the cell search and performs the second cell handover mode in the first cell;

[0067] When the cell selected by the terminal through the cell search is the same as the first cell, performing the second cell handover mode in the first cell;

[0068] The terminal does not perform RRC re-establishment, but performs the second cell switching mode in the first cell.

[0069] In the above embodiment, when the terminal fails to perform the first cell handover mode in the first cell, the terminal can perform a failure processing operation to reduce the delay of the terminal accessing the target cell and improve the reliability and availability of the NTN.

[0070] In conjunction with some embodiments of the first aspect, in some embodiments, the terminal does not perform RRC re-establishment, but performs the second cell switching mode in the first cell, including at least one of the following:

[0071] Execution of the first cell handover mode fails, and the network equipment of the source cell configures fallback to the second cell handover mode for the terminal, and the terminal does not perform RRC reestablishment;

[0072] If the execution of the first cell switching method fails, the terminal executes the second cell switching method in the first cell.

[0073] In the above embodiment, the terminal does not enter the RRC reestablishment process, which means that the terminal does not perform RRC reestablishment and directly performs the second cell handover method in the first cell. If the first cell fails to perform the first cell handover method, the RRC reestablishment process is skipped, thereby reducing the delay for the terminal to access the target cell and improving the reliability and availability of the NTN.

[0074] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes at least one of the following:

[0075] When the first cell executes the second cell handover mode, starting a first timer and / or stopping a second timer;

[0076] When the first cell sends a random access preamble, a first timer is started and / or a second timer is stopped.

[0077] In the above embodiment, when the terminal executes the second cell switching mode in the first cell and / or sends a random access preamble code, the corresponding timer can be started and / or stopped, thereby increasing the start and stop conditions of the timer and achieving high availability.

[0078] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes any one of the following:

[0079] The terminal skips the cell search, fails to perform the RRC reestablishment in the first cell, and enters the radio resource control RRC idle state;

[0080] The terminal skips cell search, fails to perform the second cell handover mode in the first cell, and enters the RRC idle state;

[0081] The terminal enters an RRC idle state when the cell selected by the terminal through the cell search is the same cell as the first cell and the first cell fails to perform the second cell handover mode;

[0082] The terminal does not perform RRC re-establishment, and if the second cell switching mode fails, performs RRC re-establishment.

[0083] In the above embodiment, the terminal can enter the RRC idle state or perform RRC reestablishment under the above circumstances, which clarifies the terminal behavior and has high availability.

[0084] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0085] Receive indication information sent by a network device of a source cell, where the indication information is used to instruct the terminal to perform the failure processing operation when the first cell fails to perform the first cell switching mode.

[0086] In the above embodiment, the terminal can perform the failure handling operation when the first cell handover mode fails in the first cell based on the indication information sent by the network device, thereby reducing the delay of the terminal accessing the target cell and improving the reliability and availability of the NTN.

[0087] In conjunction with some embodiments of the first aspect, in some embodiments, the indication information is used for at least one of the following:

[0088] Configuring the first cell switching mode for the terminal;

[0089] configuring random access resources for the terminal;

[0090] Indicates the failure handling operation.

[0091] In the above embodiment, the indication information can be indicated in an implicit manner or an explicit manner, which is simple to implement and has high usability.

[0092] In conjunction with some embodiments of the first aspect, in some embodiments, the execution failure handling operation includes at least one of the following:

[0093] Do not restart the media access control MAC layer;

[0094] The designated configuration is not released, where the designated configuration is the configuration of the first cell provided by the network equipment of the source cell for the terminal.

[0095] In the above embodiment, before the terminal performs the first handover method in the first cell, the terminal's serving cell has already configured the terminal with the terminal's configuration for the first cell. After the cell handover fails, the terminal performs failure handling in the first cell without restarting the terminal's MAC layer and can continue to use the previous configuration. This clarifies the specific terminal behavior when performing failure handling, and improves usability.

[0096] In conjunction with some embodiments of the first aspect, in some embodiments, executing the second cell switching mode in the first cell includes:

[0097] Using the parameters of the first cell in the saved RRC reconfiguration message, a first RRC reconfiguration complete message is sent to the network device of the first cell.

[0098] In the above embodiment, the terminal can use the first cell parameters in the previously stored RRC reconfiguration message to send a first RRC reconfiguration complete message to the network device of the first cell, thereby achieving the purpose of executing the second cell handover mode in the first cell with high availability.

[0099] In conjunction with some embodiments of the first aspect, in some embodiments, executing the second cell switching mode in the first cell includes:

[0100] A second RRC reconfiguration completion message is sent to the network device of the first cell again, where the second RRC reconfiguration completion message is the RRC reconfiguration completion message sent to the network device of the first cell when the terminal executes the first cell switching mode.

[0101] In the above embodiment, the terminal may send a second RRC reconfiguration message again, where the second RRC reconfiguration complete message is the RRC reconfiguration complete message sent by the terminal to the network device of the first cell when executing the first cell handover mode. This achieves the purpose of executing the second cell handover mode in the first cell, with high availability.

[0102] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0103] Report a radio link failure RLF report to the network equipment of the first cell; wherein the RLF report includes a previous handover type, and the previous handover type corresponds to the first cell handover mode.

[0104] In the above embodiment, when reporting the RLF report to the network device of the first cell, the terminal may set the previous handover type to the first cell handover mode, and inform the network device of the first cell that the previous first cell handover mode failed and the availability is high.

[0105] In combination with some embodiments of the first aspect, in some embodiments, the first cell switching mode is a cell switching mode in which a random access process is not initiated in the target cell during the switching process; and / or

[0106] The second cell switching mode is a cell switching mode in which a random access process is initiated in the target cell during the switching process.

[0107] In the above embodiment, two cell switching modes are compatible, so that after the terminal fails to execute the first cell switching mode, a failure processing operation is performed, thereby reducing the delay of the terminal accessing the target cell and improving the reliability and availability of the NTN.

[0108] In a second aspect, the present disclosure provides a failure handling method, including:

[0109] Sending instruction information to the terminal, where the instruction information is used to instruct the terminal to perform a failure processing operation when the first cell fails to perform the first cell handover mode;

[0110] The failure handling operation includes any of the following:

[0111] The terminal skips the cell search and performs RRC reestablishment in the first cell;

[0112] The terminal skips the cell search and performs the second cell handover mode in the first cell;

[0113] When the cell selected by the terminal through the cell search is the same as the first cell, performing the second cell handover mode in the first cell;

[0114] The terminal does not perform RRC re-establishment, but performs the second cell switching mode in the first cell.

[0115] In the above embodiment, the network device of the source cell of the terminal can instruct the terminal to perform a failure handling operation when the first cell handover mode fails in the first cell, thereby reducing the delay of the terminal accessing the target cell and improving the reliability and availability of the NTN.

[0116] In conjunction with some embodiments of the second aspect, in some embodiments, the terminal does not perform RRC re-establishment, but performs the second cell switching mode in the first cell, including at least one of the following:

[0117] Execution of the first cell handover mode fails, and the network equipment of the source cell of the terminal configures fallback to the second cell handover mode for the terminal, and the terminal does not perform RRC reestablishment;

[0118] If the execution of the first cell switching method fails, the terminal executes the second cell switching method in the first cell.

[0119] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes any one of the following:

[0120] determining that the terminal skips the cell search and fails to perform the RRC reestablishment in the first cell, and determining that the terminal enters a radio resource control RRC idle state;

[0121] determining that the terminal skips cell search, fails to perform the second cell handover mode in the first cell, and determines that the terminal enters an RRC idle state;

[0122] determining that a cell selected by the terminal through cell search is the same cell as the first cell, and that execution of the second cell handover mode in the first cell fails, and determining that the terminal enters an RRC idle state;

[0123] It is determined that the terminal does not perform RRC re-establishment and the execution of the second cell switching mode fails, and it is determined that the terminal performs RRC re-establishment.

[0124] In conjunction with some embodiments of the second aspect, in some embodiments, the execution failure handling operation includes at least one of the following:

[0125] Do not restart the media access control MAC layer;

[0126] The designated configuration is not released, where the designated configuration is the configuration of the first cell provided by the network equipment of the source cell of the terminal to the terminal.

[0127] In conjunction with some embodiments of the second aspect, in some embodiments, the indication information is used for at least one of the following:

[0128] configuring the first cell switching mode for the terminal;

[0129] configuring random access resources for the terminal;

[0130] Indicates the failure handling operation.

[0131] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0132] Receive a first RRC reconfiguration complete message sent by the terminal using the parameters of the first cell in the saved RRC reconfiguration message.

[0133] In the above embodiment, the network device serving as the first cell can receive the first RRC reconfiguration completion message sent by the terminal, thereby enabling the terminal to perform the second cell switching mode in the first cell, with high availability.

[0134] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0135] A second RRC reconfiguration completion message is received which is sent again by the terminal. The second RRC reconfiguration completion message is an RRC reconfiguration completion message sent by the terminal to the network device of the first cell when executing the first cell switching mode.

[0136] In the above embodiment, the network device serving as the first cell can receive the second RRC reconfiguration completion message sent again by the terminal, thereby enabling the terminal to perform the second cell switching mode in the first cell, with high availability.

[0137] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0138] Receive a radio link failure RLF report reported by the terminal; wherein the RLF report includes a previous handover type, and the previous handover type corresponds to the first cell handover mode.

[0139] In the above embodiment, the network device as the first cell can receive the RLF report reported by the terminal, and determine that the terminal has failed to execute the first cell handover mode before, and the availability is high.

[0140] In combination with some embodiments of the second aspect, in some embodiments, the first cell switching mode is a cell switching mode in which a random access process is not initiated in the target cell during the switching process; and / or

[0141] The second cell switching mode is a cell switching mode in which a random access process is initiated in the target cell during the switching process.

[0142] In a third aspect, an embodiment of the present disclosure provides a terminal, including:

[0143] A processing module is configured to execute a failure processing operation when the first cell handover mode fails in the first cell;

[0144] The failure handling operation includes any of the following:

[0145] The terminal skips the cell search and performs RRC reestablishment in the first cell;

[0146] The terminal skips the cell search and performs the second cell handover mode in the first cell;

[0147] When the cell selected by the terminal through the cell search is the same as the first cell, performing the second cell handover mode in the first cell;

[0148] The terminal does not perform RRC re-establishment, but performs the second cell switching mode in the first cell.

[0149] In a fourth aspect, an embodiment of the present disclosure provides a network device, including:

[0150] a transceiver module configured to send indication information to a terminal, wherein the indication information is used to instruct the terminal to perform a failure processing operation when the first cell fails to perform the first cell handover mode;

[0151] The failure handling operation includes any of the following:

[0152] The terminal skips the cell search and performs RRC reestablishment in the first cell;

[0153] The terminal skips the cell search and performs the second cell handover mode in the first cell;

[0154] When the cell selected by the terminal through the cell search is the same as the first cell, performing the second cell handover mode in the first cell;

[0155] The terminal does not perform RRC re-establishment, but performs the second cell switching mode in the first cell.

[0156] In a fifth aspect, an embodiment of the present disclosure provides a terminal, including:

[0157] one or more processors;

[0158] The terminal is used to execute the failure handling method described in any one of the first aspects.

[0159] In a sixth aspect, an embodiment of the present disclosure provides a network device, including:

[0160] one or more processors;

[0161] The network device is used to execute the method for failure handling described in any one of the second aspects.

[0162] In a seventh aspect, an embodiment of the present disclosure proposes a storage medium storing instructions. When the instructions are executed on a communication device, the communication device executes a failure handling method as described in any one of the first aspect or the second aspect.

[0163] In the eighth aspect, an embodiment of the present disclosure proposes a communication system, including a terminal and a network device, wherein the terminal is configured to implement the failure handling method described in any one of the first aspects, and the network device is configured to implement the failure handling method described in any one of the second aspects.

[0164] It is understandable that the above network devices, communication systems, storage media, and computer programs are all used to execute the methods proposed in the embodiments of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects of the corresponding methods and will not be repeated here.

[0165] The present disclosure provides a failure handling method, apparatus, and storage medium. In some embodiments, the terms "failure handling method" and "information processing method" and "communication method" are interchangeable; the terms "failure handling apparatus" and "information processing apparatus" and "communication apparatus" are interchangeable; and the terms "information processing system" and "communication system" are interchangeable.

[0166] The embodiments of the present disclosure are not exhaustive and are merely illustrative of some embodiments, and are not intended to be a specific limitation on the scope of protection of the present disclosure. In the absence of contradiction, each step in a certain embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a certain embodiment can also be implemented as an independent embodiment, and the order of the steps in a certain embodiment can be arbitrarily exchanged. In addition, the optional implementation methods in a certain embodiment can be arbitrarily combined; in addition, the embodiments can be arbitrarily combined. For example, some or all steps of different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0167] In each embodiment of the present disclosure, unless otherwise specified or provided for by logic, the terms and / or descriptions between the embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form a new embodiment based on their inherent logical relationships.

[0168] The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0169] In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular, such as "a", "an", "the", "above", "said", "the", "the", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when using articles such as "a", "an", "the" in English in translation, the noun following the article may be understood as a singular expression or a plural expression.

[0170] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0171] In some embodiments, the terms "at least one," "one or more," "a plurality of," "multiple," etc. may be used interchangeably.

[0172] In some embodiments, descriptions such as "at least one of A and B," "A and / or B," "A in one case, B in another case," or "in response to one case A, in response to another case B" may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); and in some embodiments, A and B (both A and B are executed). The above is also applicable when there are more branches such as A, B, and C.

[0173] In some embodiments, "A or B" and other descriptions may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The above is also applicable when there are more branches such as A, B, C, etc.

[0174] The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects and do not constitute any restriction on the position, order, priority, quantity or content of the description objects. For the statement of the description object, please refer to the description in the context of the claims or embodiments, and no unnecessary restriction should be constituted due to the use of prefixes. For example, if the description object is a "field", the ordinal number before the "field" in the "first field" and the "second field" does not limit the position or order between the "fields". "First" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of the "first field" and the "second field". For another example, if the description object is a "level", the ordinal number before the "level" in the "first level" and the "second level" does not limit the priority between the "levels". For another example, the number of description objects is not limited by the ordinal number and can be one or more. Taking "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes can be the same or different. For example, if the description object is "device", then the "first device" and the "second device" can be the same device or different devices, and their types can be the same or different; for another example, if the description object is "information", then the "first information" and the "second information" can be the same information or different information, and their contents can be the same or different.

[0175] In some embodiments, “including A,” “comprising A,” “used to indicate A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0176] In some embodiments, devices and equipment can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. In some cases, they can also be understood as "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "entity", "subject", etc.

[0177] In some embodiments, "network" can be interpreted as devices included in the network, such as access network equipment, core network equipment, etc.

[0178] In some embodiments, "access network device (AN device)" may also be referred to as "radio access network device (RAN device)", "base station (BS)", "radio base station", "fixed station", and in some embodiments may also be understood as "node", "access point", "transmission point (TP)", "reception point (RP)", "transmission and / or reception point (TRP)" "panel", "antenna panel", "antenna array", "cell", "macro cell", "small cell", "femto cell", "pico cell", "sector", "cell group", "serving cell", "carrier", "component carrier", "bandwidth part (BWP)", etc.

[0179] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0180] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0181] In addition, each element, each row, or each column in the table of the embodiment of the present disclosure can be implemented as an independent embodiment, and the combination of any elements, any rows, and any columns can also be implemented as an independent embodiment.

[0182] FIG1 is a schematic diagram showing the architecture of a communication system according to an embodiment of the present disclosure.

[0183] As shown in FIG. 1 , a communication system 100 includes a terminal 101 and a network device 102 .

[0184] In some embodiments, the terminal 101 includes, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, and at least one of a wireless terminal device in a smart home, but is not limited thereto.

[0185] In some embodiments, the network device 102 may include, but is not limited to, the network device 102 - 1 of the source cell and the network device 102 - 2 of the first cell.

[0186] Among them, network equipment may include but is not limited to access network equipment and core network equipment.

[0187] In some embodiments, the access network device is, for example, a node or device that accesses a terminal to a wireless network. The access network device may include an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved nodeB (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open base station (Open RAN), a cloud base station (Cloud RAN), a base station in other communication systems, and at least one of an access node in a Wi-Fi system, but is not limited thereto.

[0188] In some embodiments, the access network device can be composed of a centralized unit (CU) and a distributed unit (DU), where the CU can also be called a control unit. The CU-DU structure can be used to split the protocol layer of the access network device, with the functions of some protocol layers centrally controlled by the CU, and the functions of the remaining part or all of the protocol layers distributed in the DU, which is centrally controlled by the CU, but is not limited to this.

[0189] In some embodiments, a core network device may be a device including one or more network elements, or may be multiple devices or a group of devices. A network element may be virtual or physical. The core network may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0190] In some embodiments, the technical solution of the present disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within the access network devices involved in the embodiments of the present disclosure can be transformed into internal interfaces of the Open RAN, and the processes and information interactions between these internal interfaces can be implemented through software or programs.

[0191] In some embodiments, in some embodiments, the terminal 103 is connected to the core network device through the access network device.

[0192] It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution proposed in the embodiment of the present disclosure. Ordinary technicians in this field can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution proposed in the embodiment of the present disclosure is also applicable to similar technical problems.

[0193] The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG1 , or a portion thereof, but are not limited thereto. The entities shown in FIG1 are illustrative only. The communication system may include all or part of the entities shown in FIG1 , or may include other entities outside of FIG1 . The number and form of the entities are arbitrary, and the entities may be physical or virtual. The connection relationships between the entities are illustrative only. The entities may be connected or disconnected, and the connection may be in any manner, including direct or indirect, wired or wireless.

[0194] The embodiments of the present disclosure can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), future radio access (FRA), new radio access technology (RAT), new radio (NR), new radio access (NX), future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), Public Land Mobile Network (PLMN) networks, systems utilizing other communication methods, and next-generation systems based on these. Furthermore, a combination of multiple systems (for example, a combination of LTE or LTE-A with 5G) may also be used.

[0195] FIG2 is an interactive diagram of a failure handling method according to an embodiment of the present disclosure. As shown in FIG2 , the embodiment of the present disclosure relates to a failure handling method, which includes:

[0196] Step S2101 , the network device 102 - 1 of the source cell sends indication information to the terminal 101 .

[0197] In some embodiments, terminal 101 receives the indication information.

[0198] In some embodiments, the indication information is used to instruct the terminal 101 to perform a failure processing operation when the first cell switching mode fails to be executed in the first cell. The first cell may be the cell where the terminal 101 fails to execute the first cell switching mode.

[0199] In some embodiments, the first cell switching mode is a cell switching mode in which a random access process is not initiated in the target cell during the switching process, that is, the terminal 101 does not send a random access (channel) preamble (RACH preamble) in the target cell when executing the first cell switching mode.

[0200] Exemplarily, the first cell handover method may be a cell handover method without a random access procedure (RACH-less handover).

[0201] It can be understood that when the terminal 101 executes the first cell switching mode, the terminal does not need to perform a random access process in the target cell, for example, the terminal 101 does not need to send message 1 (Message1, MSG1) to the network device 102, does not need to receive message 2 (MGS2) sent by the network device 102, or the terminal 101 does not need to send message A (MessageA, MSGA) to the network device 102.

[0202] Exemplarily, the terminal 101 does not send MSG1 and does not receive MSG2, or does not send MSGA, and may directly send a radio resource control reconfiguration complete (RRCReconfiguration complete) message.

[0203] That is, the first cell switching mode is a switching mode based on RACH-less, which may refer to a process in which the terminal does not need to initiate random access in the target cell when switching to the target cell. For example, there is no need to send a random access sequence, such as a preamble, to the target cell. The physical uplink shared channel (PUSCH) can be sent directly based on the uplink scheduling grant (UL grant) sent by the target cell. For example, the terminal 101 can send an RRCReconfiguration complete message based on the UL grant.

[0204] In some embodiments, the name of the indication information is not limited, and it can be, for example, an indication message, a first signaling, a first message, etc.

[0205] In some embodiments, the indication information may be used to configure the first cell switching mode for the terminal 101 .

[0206] In an example, the network device 102 - 1 of the source cell configures RACH-less handover for the terminal 101 through the indication information.

[0207] At this time, the indication information can also be used to instruct the terminal 101 to perform a failure handling operation when the first cell handover mode fails to be executed in the first cell. It can be understood that when the network device 102-1 of the source cell configures RACH-less handover for the terminal 101, the terminal 101 performs a failure handling operation by default when the first cell handover mode fails to be executed in the first cell.

[0208] In some embodiments, the indication information may be used to configure random access (channel) RACH resources for the terminal 101 .

[0209] In one example, the network device 102-1 of the source cell configures resources for sending MSG1 or MSGA for the terminal 101 through the indication information. The indication information can also be used to instruct the terminal 101 to perform a failure handling operation when the first cell handover mode fails to be executed in the first cell. It is understandable that when the network device 102-1 of the source cell configures RACH resources for the terminal 101, the terminal 101 performs the failure handling operation by default when the first cell handover mode fails to be executed in the first cell.

[0210] In some embodiments, the indication information may be used to indicate a failed processing operation.

[0211] In an example, the network device 102-1 of the source cell directly instructs the terminal 101 through instruction information to perform a failure processing operation that needs to be performed when the first cell switching mode fails to be executed in the first cell.

[0212] In some embodiments, the indication information may implicitly indicate to the terminal 101 to perform a failure processing operation when the first cell fails to perform the first cell switching mode in the first cell.

[0213] Exemplarily, the indication information is used to configure a first cell switching mode for the terminal 101 , or to configure RACH resources for the terminal 101 .

[0214] The above description is merely an exemplary description, and all solutions in which the indication information implicitly instructs the terminal 101 to perform a failure processing operation when the first cell switching mode fails to be performed in the first cell should fall within the protection scope of the present disclosure.

[0215] In some embodiments, the indication information may be displayed to indicate to the terminal 101 to perform a failure processing operation when the first cell switching mode fails to be performed in the first cell.

[0216] Exemplarily, when the bit value corresponding to the indication information is set to "1" or "0", it is used to instruct the terminal 101 to perform a failure processing operation when the first cell switching mode fails to be executed in the first cell.

[0217] Exemplarily, when the bit value corresponding to the indication information is set to "00", "01" or other values, it is used to instruct the terminal 101 to perform a failure processing operation when the first cell switching mode fails to be executed in the first cell. For example, the bit value corresponding to the indication information is set to "00" to instruct the terminal 101 to skip the cell search and perform RRC reestablishment in the first cell. For another example, the bit value corresponding to the indication information is set to "01" to instruct the terminal 101 to skip the cell search and perform the second cell switching mode in the first cell.

[0218] The above description is merely an exemplary description, and all solutions in which the indication information explicitly instructs the terminal 101 to perform a failure processing operation when the first cell switching mode fails to be performed in the first cell should fall within the protection scope of the present disclosure.

[0219] In some embodiments, the above failure handling operations include but are not limited to two categories:

[0220] In the first type of failure processing operation, the terminal 101 enters the Radio Resource Control (RRC) re-establishment process, but may execute a simplified RRC re-establishment process.

[0221] The second type of failure processing operation is that the terminal 101 does not enter the RRC re-establishment process.

[0222] In one example, for the first type of failure handling operation, terminal 101 may skip cell search and perform RRC reestablishment in the first cell. Alternatively, terminal 101 may skip cell search and perform the second cell handover method in the first cell. Alternatively, when the cell selected by terminal 101 through cell search is the same cell as the first cell, terminal 101 may perform the second cell handover method in the first cell.

[0223] In one example, for the second type of failure processing operation, the terminal 101 may not perform RRC re-establishment, but perform the second cell switching mode in the first cell.

[0224] The above description is merely an example, and all failure handling methods performed after the RACH less handover fails should fall within the scope of protection of the present disclosure.

[0225] In some embodiments, the second cell switching mode is a cell switching mode in which a random access process is initiated in a target cell during the switching process.

[0226] Exemplarily, the second cell handover method may be a cell handover method based on a random access procedure (RACH based handover).

[0227] It can be understood that when the terminal 101 executes the second cell switching mode, it can send message 1 (Message1, MSG1) to the network device 102 to obtain uplink synchronization, receive message 2 (Message1, MSG2) sent by the network device 102, or send message A (MessageA, MSGA) to obtain uplink synchronization, receive message B (MessageB, MSGB) sent by the network device 102, and after completing the uplink synchronization, send a physical uplink shared channel (Physical Uplink Shared Channel, PUSCH), such as an RRCReconfiguration complete message.

[0228] In some embodiments, the indication information is used to instruct the terminal 101 to perform a failure handling operation when the RACH less handover fails in the first cell. The failure handling operation may be independent of the second cell handover mode. Exemplarily, the failure handling operation may include skipping the cell search and directly performing RRC reconstruction.

[0229] In some embodiments, the indication information is used to instruct the terminal 101 to perform a failure handling operation when the RACH less handover fails in the first cell. The failure handling operation may be associated with the second cell handover mode, ie, associated with RACH based handover.

[0230] Exemplarily, the failure handling operation includes any one of the following: the terminal skips the cell search and performs the second cell switching method in the first cell; when the cell selected by the terminal through the cell search is the same cell as the first cell, the second cell switching method is performed in the first cell; the terminal does not perform RRC reconstruction, but performs the second cell switching method in the first cell.

[0231] Exemplarily, the failure handling operation associated with RACH-based handover includes: when the terminal 101 fails to perform RACH-less handover in the first cell, falling back to RACH-based handover, and initiating a random access procedure in the first cell to access the first cell. In the disclosed embodiment, the terminal 101 may directly select the first cell as the target cell, or perform a cell search and, if it is determined that the target cell is the same cell as the first cell, initiate a random access procedure in the first cell to access the first cell.

[0232] Step S2102: The terminal 101 fails to execute the first cell switching mode in the first cell and performs a failure processing operation.

[0233] In some embodiments, when the first timer times out, the terminal 101 determines that the first cell switching mode has failed to be executed in the first cell.

[0234] Exemplarily, the first timer may be a timer started when the terminal 101 receives an RRC reconfiguration message, where the RRC reconfiguration message includes synchronous reconfiguration (Reconfiguration with sync).

[0235] And / or, the first timer may be a timer that is stopped when the terminal 101 completes random access in a special cell (SpCell). For dual-connectivity operation, the special cell refers to a primary cell (PCell) of a master cell group (MCG) or a primary secondary cell (PSCell) of a secondary cell group (SCG). For single-connectivity operation, the special cell refers to a PCell.

[0236] Exemplarily, the first timer may be T304.

[0237] When T304 times out, the terminal 101 determines that the RACH less handover in the first cell has failed, and then performs a failure processing operation.

[0238] In the related art, when T304 times out, the terminal 101 determines that the cell handover has failed, and the terminal performs RRC reestablishment.

[0239] In related technologies, the RRC re-establishment process includes: the terminal first performs a cell search, selects a suitable cell, and then initiates an RRC re-establishment request in the cell.

[0240] In the embodiment of the present disclosure, the terminal 101 performs the following failed operation processing:

[0241] 1. In some embodiments, if the terminal 101 fails to perform the first cell handover mode in the first cell, the terminal 101 may skip the cell search and perform RRC reestablishment in the first cell.

[0242] In one example, the terminal 101 skips the cell search based on the indication information sent by the network device 102-1 of the source cell and directly performs RRC reestablishment in the first cell.

[0243] In an embodiment of the present disclosure, the terminal 101 may skip the above-mentioned cell search, select the first cell as a suitable cell (ie, target cell), and perform RRC reconstruction in the first cell, for example, initiating an RRC reconstruction request to the network device 102-2 of the first cell.

[0244] 2. In some embodiments, if the terminal 101 fails to execute the first cell switching mode in the first cell, the terminal 101 may skip the cell search and execute the second cell switching mode in the first cell.

[0245] In one example, the terminal 101 skips the cell search based on the indication information sent by the network device 102-1 of the source cell, and performs the second cell switching mode in the first cell.

[0246] In the disclosed embodiment, although the terminal 101 enters the RRC reestablishment process, it also skips the cell search and directly performs the second cell handover mode in the first cell, that is, performs RACH based handover in the first cell.

[0247] In the disclosed embodiment, although the terminal 101 enters the RRC reestablishment process, it also skips the cell search, directly determines the first cell as a suitable cell, and performs RACH based handover in the first cell.

[0248] In one example, the terminal 101 performing the second cell switching mode in the first cell may include: the terminal 101 uses the parameters of the first cell in the saved RRC reconfiguration message to send a first RRC reconfiguration complete message to the network device 102-2 of the first cell. It can be understood that the saved RRC reconfiguration message is the RRC reconfiguration message when the terminal 101 performs the first cell switching mode in the first cell, that is, the RRC reconfiguration message includes relevant parameters of the first cell.

[0249] The terminal 101 receives an RRC reconfiguration message sent by the network device 102-1 of the source cell, which includes relevant parameters of the target cell (i.e., the first cell). The terminal 101 can use the parameters of the first cell to send a first RRC reconfiguration complete message to the network device 102-2 of the first cell. Exemplarily, the parameters of the first cell used by the terminal 101 do not include at least one of the following: a random access skip (RACH skip) parameter; an uplink scheduling grant (UL grant) parameter; or a timing advance (TA) parameter.

[0250] Exemplarily, the first cell-related parameters in the RRC reconfiguration message sent by network device 102-1 of the source cell include: a RACH skip parameter; a UL grant parameter; and a TA parameter. When the terminal sends the first RRC reconfiguration complete message using the parameters of the first cell, the aforementioned parameters are ignored. It is understood that when sending the RRC reconfiguration message, terminal 101 sends a RACH preamble (sending a random access message), does not use the UL grant of the RRC reconfiguration message, and instead monitors the PDCCH in the first cell to obtain the UL grant, and determines the TA parameter based on MSG2 or MSGB sent by the first cell.

[0251] In one example, the terminal 101 performing the second cell switching mode in the first cell may include: again sending a second RRC reconfiguration complete message to the network device 102-2 of the first cell. The second RRC reconfiguration complete message is the RRC reconfiguration complete message sent by the terminal to the network device 102-2 of the first cell when performing the first cell switching mode.

[0252] That is, the second RRC reconfiguration completion message sent by the terminal 101 to the network device 102-2 of the first cell is the RRC reconfiguration completion message previously sent by the terminal 101 to the network device 102-2 of the first cell.

[0253] In one example, the terminal 101 skips the cell search and may start the first timer when the first cell performs the second cell switching mode.

[0254] And / or, the terminal 101 may start the first timer when sending a random access preamble code in the first cell.

[0255] Exemplarily, the first timer may be a T304 timer.

[0256] The embodiment of the present disclosure provides a starting condition for T304, which includes at least one of the following: the terminal 101 skips the cell search and performs the second cell switching mode in the first cell; the terminal 101 sends a random access preamble code in the first cell.

[0257] The embodiment of the present disclosure further provides a stop condition of T304, which includes: the terminal 101 executes the first cell switching mode to complete the cell switching in the first cell.

[0258] In one example, the terminal 101 skips the cell search and may stop the second timer when the first cell performs the second cell switching mode.

[0259] And / or, the terminal 101 may stop the second timer when sending a random access preamble code in the first cell.

[0260] Exemplarily, the second timer may be a timer started by the terminal 101 when starting the RRC reestablishment process.

[0261] And / or, the second timer may be a timer that stops after the terminal 101 selects a suitable cell (suitable NR cell).

[0262] Exemplarily, the second timer may be a T311 timer.

[0263] The embodiment of the present disclosure provides a stop condition for T311, which includes but is not limited to at least one of: the terminal 101 skips the cell search and performs the second cell switching mode in the first cell; the terminal 101 sends a random access preamble code in the first cell.

[0264] 3. In some embodiments, if the terminal 101 fails to perform the first cell switching mode in the first cell, the terminal 101 may perform the second cell switching mode in the first cell when the cell selected by the cell search is the same cell as the first cell.

[0265] In the embodiment of the present disclosure, the terminal 101 enters the RRC reestablishment process and performs a cell search. If the selected cell is the first cell, a RACH based handover is performed in the first cell.

[0266] In one example, the terminal 101 performs the second cell switching mode in the first cell when the cell selected by the cell search based on the indication information sent by the network device 102-1 of the source cell is the same cell as the first cell.

[0267] In the disclosed embodiment, the terminal 101 enters the RRC reestablishment process and performs a cell search. When the selected cell is the same as the first cell, the second cell handover mode is performed in the first cell, that is, RACH based handover is performed in the first cell.

[0268] In an example, the terminal 101 executing the second cell switching mode in the first cell may include: the terminal 101 uses the parameters of the first cell in the saved RRC reconfiguration message to send a first RRC reconfiguration complete message to the network device 102-2 of the first cell.

[0269] Among them, terminal 101 receives the RRC reconfiguration message sent by network device 102-1 of the source cell, which includes relevant parameters of the target cell (first cell). Terminal 101 can use the parameters of the first cell to send a first RRC reconfiguration completion message to network device 102-2 of the first cell. Exemplarily, network device 102-2 of the first cell can send the parameters of the first cell to network device 102-1 of the source cell, and network device 102-1 of the source cell provides them to terminal 101.

[0270] Exemplarily, the parameters of the first cell used by the terminal 101 do not include at least one of the following: a random access skip (RACH skip) parameter; an uplink scheduling grant (UL grant) parameter; or a timing advance (TA) parameter.

[0271] Exemplarily, the first cell-related parameters in the RRC reconfiguration message sent by the network device 102-1 of the source cell include: RACH skip parameter; UL grant parameter; TA parameter. When the terminal uses the parameters of the first cell to send the first RRC reconfiguration complete message, the above parameters are ignored.

[0272] In one example, the terminal 101 performing the second cell switching mode in the first cell may include: again sending a second RRC reconfiguration complete message to the network device 102-2 of the first cell. The second RRC reconfiguration complete message is the RRC reconfiguration complete message sent by the terminal to the network device 102-2 of the first cell when performing the first cell switching mode.

[0273] That is, the second RRC reconfiguration complete message sent by terminal 101 to network device 102-2 of the first cell is the RRC reconfiguration complete cell message previously sent by terminal 101 to network device 102-2 of the first cell. In one example, the cell selected by terminal 101 through cell search is the same cell as the first cell, and when the first cell executes the second cell switching mode, the first timer can be started.

[0274] And / or, the terminal 101 may start the first timer when sending a random access preamble code in the first cell.

[0275] Exemplarily, the first timer may be a T304 timer.

[0276] An embodiment of the present disclosure provides a starting condition for T304, which includes at least one of the following: the cell selected by the terminal 101 through cell search is the same cell as the first cell, and the second cell switching method is performed in the first cell; the terminal 101 sends a random access preamble code in the first cell.

[0277] The embodiment of the present disclosure further provides a stop condition of T304, which includes: the terminal 101 executes the first cell switching mode to complete the cell switching in the first cell.

[0278] In an example, the cell selected by the terminal 101 through the cell search is the same cell as the first cell, and when the second cell switching mode is executed in the first cell, the second timer can be stopped.

[0279] And / or, the terminal 101 may stop the second timer when sending a random access preamble code in the first cell.

[0280] Exemplarily, the second timer may be a T311 timer.

[0281] An embodiment of the present disclosure provides a stop condition for T311, which includes but is not limited to at least one of the following: the cell selected by the terminal 101 through cell search is the same cell as the first cell, and the second cell switching method is performed in the first cell; the terminal 101 sends a random access preamble code in the first cell.

[0282] 4. In some embodiments, if the terminal 101 fails to execute the first cell switching mode in the first cell, it may not perform RRC re-establishment, but execute the second cell switching mode in the first cell.

[0283] In one example, if terminal 101 fails to perform RACH-less handover in the first cell, and network device 102-1 in the source cell configures a second cell handover mode fallback for terminal 101, i.e., allows terminal 101 to fall back to RACH-based handover, terminal 101 may not enter the RRC reestablishment process. Alternatively, if terminal 101 fails to perform RACH-less handover in the first cell, terminal 101 may directly perform the second cell handover mode, i.e., perform RACH-based handover, in the first cell.

[0284] In one example, the terminal 101 performing the second cell switching mode in the first cell may include: the terminal 101 uses the parameters of the first cell in the saved RRC reconfiguration message to send a first RRC reconfiguration completion message to the network device 102-2 of the first cell. The terminal 101 receives the RRC reconfiguration message sent by the network device 102-1 of the source cell, which includes the relevant parameters of the first cell. The terminal 101 may use the parameters of the first cell to send the first RRC reconfiguration completion message to the network device 102-2 of the first cell. Exemplarily, the parameters of the first cell used by the terminal 101 do not include at least one of the following: a random access skip (RACH skip) parameter; an uplink scheduling grant (UL grant) parameter; a timing advance (TA) parameter.

[0285] Exemplarily, the parameters related to the first cell in the RRC reconfiguration message include: a RACH skip parameter; a UL grant parameter; and a TA parameter. When the terminal uses the parameters of the first cell to send the first RRC reconfiguration complete message, the above parameters are ignored.

[0286] In one example, the terminal 101 performing the second cell switching mode in the first cell may include: again sending a second RRC reconfiguration complete message to the network device 102-2 of the first cell. The second RRC reconfiguration complete message is the RRC reconfiguration complete message sent by the terminal to the network device 102-2 of the first cell when performing the first cell switching mode.

[0287] That is, the second RRC reconfiguration completion message sent by the terminal 101 to the network device 102-2 of the first cell is the RRC reconfiguration completion message previously sent by the terminal 101 to the network device 102-2 of the first cell.

[0288] In one example, the terminal 101 does not perform RRC re-establishment, but may start a first timer when the first cell performs the second cell switching mode.

[0289] And / or, the terminal 101 may start the first timer when sending a random access preamble code in the first cell.

[0290] Exemplarily, the first timer may be a T304 timer.

[0291] The embodiment of the present disclosure provides a starting condition for T304, which includes at least one of the following: the terminal 101 does not perform RRC reconstruction, but performs the second cell switching mode in the first cell; the terminal 101 sends a random access preamble code in the first cell.

[0292] The embodiment of the present disclosure further provides a stop condition of T304, which includes: the terminal 101 executes the first cell switching mode to complete the cell switching in the first cell.

[0293] It should be noted that when the terminal 101 fails to perform the first cell handover mode (RACH less handover) in the first cell, since the terminal 101 does not perform RRC re-establishment, the second timer, that is, T311, is not started.

[0294] It is understandable that T311 needs to be started after the terminal 101 enters the RRC re-establishment process and stopped when a suitable cell is searched. In the embodiment of the present disclosure, since the terminal 101 does not enter the RRC re-establishment process, T311 will not be started in this case.

[0295] In some embodiments, the failure processing operations performed by the terminal 101 may include but are not limited to at least one of the following: not restarting the Medium Access Control (MAC) layer; not releasing the specified configuration.

[0296] The designated configuration refers to the configuration of the first cell provided by the network device 102-1 of the source cell to the terminal 101. The present disclosure does not limit the content of the configuration of the first cell. It is understood that before the terminal 101 performs the first-mode handover in the first cell, the serving cell of the terminal 101 has already configured the terminal 101 with the configuration of the first cell. After the handover fails, the terminal 101 performs a failure handling operation in the first cell and continues to use the previous configuration of the first cell.

[0297] In some embodiments, if the terminal 101 does not receive the above-mentioned indication information sent by the network device 102-1 of the source cell, the terminal 101 can restart the MAC layer after failing to execute the first cell switching method in the first cell, and / or release the specified configuration, which is the configuration of the first cell provided by the network device 102-1 of the source cell to the terminal 101.

[0298] In step S2103, the terminal 101 fails to perform the failure processing operation and enters the RRC idle state or performs RRC reconstruction.

[0299] In some embodiments, the terminal 101 skips the cell search and performs the RRC re-establishment in the first cell. If the RRC re-establishment in the first cell fails, the terminal 101 may enter an RRC idle state.

[0300] In some embodiments, the terminal 101 skips the cell search and performs the second cell handover mode in the first cell. If the second cell handover mode fails, that is, the RACH based handover fails, the terminal 101 may enter the RRC idle state.

[0301] In some embodiments, the cell selected by the terminal 101 through the cell search is the same cell as the first cell, and the second cell handover method is performed in the first cell. If the second cell handover method fails, that is, the RACH based handover fails, the terminal 101 may enter the RRC idle state.

[0302] In some embodiments, the terminal 101 does not perform RRC re-establishment, but performs the second cell handover mode. If the second cell handover mode fails, that is, the RACH based handover fails, the terminal 101 may perform RRC re-establishment.

[0303] In step S2104, the terminal 101 reports a radio link failure (RLF) report to the network device 102-2 of the first cell.

[0304] In some embodiments, the network device 102-2 of the first cell may receive the RLF report.

[0305] In some embodiments, the RLF report includes a last HO type (lastHO-Type), which corresponds to the first cell handover mode. That is, the terminal 101 may set the lastHO-Type in the RLF report to RACH less handover.

[0306] In some embodiments, the names of information, etc. are not limited to the names described in the embodiments, and terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "symbol", "codeword", "codebook", "codeword", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

[0307] In some embodiments, the terms "uplink", "uplink", "physical uplink", etc. can be used interchangeably.

[0308] In some embodiments, the terms "downlink", "physical downlink", etc. can be used interchangeably.

[0309] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0310] In some embodiments, "obtain", "get", "get", "receive", "transmit", "bidirectional transmission", "send and / or receive" can be interchangeable, and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining by self-processing, autonomous implementation, etc.

[0311] In some embodiments, terms such as "certain", "preset", "preset", "setting", "indicated", "a certain", "any", "first", and "designated" can be interchangeable. "Specific A", "preset A", "preset A", "setting A", "indicated A", "a certain A", "any A", and "first A" can be interpreted as A pre-specified in a protocol, etc., or as A obtained through setting, configuration, or indication, etc., or as specific A, a certain A, any A, or first A, etc., but not limited to this.

[0312] In some embodiments, the failure handling method involved in the embodiments of the present disclosure may include at least one of steps S2101 to S2104. For example, step S2101 can be implemented as an independent embodiment, step S2102 can be implemented as an independent embodiment, steps S2101+S2102 can be implemented as an independent embodiment, step S2103 can be implemented as an independent embodiment, step S2104 can be implemented as an independent embodiment, and steps S2101 to S2104 can be implemented as independent embodiments, but are not limited thereto.

[0313] In some embodiments, step S2101 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if the terminal 101 determines to perform a failure handling operation when the first cell handover mode fails in the first cell according to a protocol agreement or based on a predefined rule, step S2101 may not be performed.

[0314] In some embodiments, step S2102 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if terminal 101 fails to perform the first cell handover mode in the first cell and performs RRC reestablishment according to relevant technologies, step S2102 may not be performed.

[0315] In some embodiments, step S2103 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if terminal 101 successfully performs the failure handling operation, step S2103 may not be performed. For another example, if terminal 101 fails to perform the first cell handover mode in the first cell and performs RRC reestablishment according to relevant technologies, step S2103 may not be performed.

[0316] In some embodiments, step S2104 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if the terminal 101 determines that the conditions for reporting the RLF report are not met, step S2104 may not be performed.

[0317] In some embodiments, the execution order of step S2103 and step S2104 is not limited. For example, step S2103 may be executed first, and then step S2104. For another example, step S2104 may be executed first, and then step S2103.

[0318] In some embodiments, steps S2101 to S2104 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0319] In the above embodiment, when the terminal fails to perform the first cell handover mode in the first cell, the terminal can perform a failure processing operation to reduce the delay of the terminal accessing the target cell and improve the reliability and availability of the NTN.

[0320] FIG3A is a flow chart of a failure handling method according to an embodiment of the present disclosure. As shown in FIG3A , the present disclosure embodiment relates to a failure handling method, which can be executed by terminal 101 and includes:

[0321] Step S3101, obtain instruction information.

[0322] In some embodiments, the indication information is used to instruct the terminal 101 to perform a failure processing operation when the first cell switching mode fails to be executed in the first cell. The first cell may be the cell where the terminal 101 fails to execute the first cell switching mode.

[0323] In some embodiments, the terminal 101 may obtain the indication information from the network device 102, but is not limited thereto and may also receive indication information sent by other entities.

[0324] In some embodiments, the terminal 101 obtains the indication information determined according to predefined rules.

[0325] In some embodiments, the terminal 101 performs processing to obtain the indication information.

[0326] In some embodiments, step S3101 is omitted, the terminal 101 autonomously implements the function indicated by the indication information, or the terminal 101 obtains the indication information based on predefined rules or protocol agreements, or the above functions are default or default.

[0327] In some embodiments, the optional implementation of step S3101 can refer to the optional implementation of step S2101 in Figure 2 and other related parts of the embodiment involved in Figure 2, which will not be repeated here.

[0328] Step S3102: Execute failure handling operations.

[0329] In some embodiments, when the terminal 101 fails to execute the first cell switching mode in the first cell, the terminal 101 performs a failure processing operation.

[0330] In some embodiments, the terminal 101 performs a failure processing operation based on the indication information when the first cell switching mode fails to be executed in the first cell.

[0331] In some embodiments, the optional implementation of step S3102 can refer to the optional implementation of step S2102 in Figure 2 and other related parts of the embodiment involved in Figure 2, which will not be repeated here.

[0332] Step S3103: Enter the specified terminal state or perform a specified operation.

[0333] In some embodiments, the designated terminal state includes but is not limited to an RRC idle state.

[0334] In some embodiments, the designated operation includes, but is not limited to, an RRC re-establishment operation.

[0335] In some embodiments, if the terminal 101 fails to perform the above-mentioned failure processing operation again, the terminal 101 may enter the RRC idle state or perform RRC reconstruction.

[0336] In some embodiments, the optional implementation of step S3103 can refer to the optional implementation of step S2103 in Figure 2 and other related parts of the embodiment involved in Figure 2, which will not be repeated here.

[0337] Step S3104, submit the report.

[0338] In some embodiments, the report is a RLF report.

[0339] In some embodiments, terminal 101 reports the report to network device 102.

[0340] In some embodiments, network device 102 receives the report.

[0341] In some embodiments, the optional implementation of step S3104 can refer to the optional implementation of step S2104 in Figure 2 and other related parts of the embodiment involved in Figure 2, which will not be repeated here.

[0342] The communication method involved in the embodiments of the present disclosure may include at least one of steps S3101 to S3104. For example, step 3101 may be implemented as an independent embodiment, step S3102 may be implemented as an independent embodiment, steps S3101+S3102 may be implemented as an independent embodiment, step S3103 may be implemented as an independent embodiment, step S3104 may be implemented as an independent embodiment, and steps S3101 to S3104 may be implemented as independent embodiments, but are not limited thereto.

[0343] In some embodiments, step S3101 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if the terminal 101 determines to perform a failure handling operation when the first cell handover mode fails in the first cell according to a protocol agreement or based on a predefined rule, step S3101 may not be performed.

[0344] In some embodiments, step S3102 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if terminal 101 fails to perform the first cell handover mode in the first cell and performs RRC reestablishment according to relevant technologies, step S3102 may not be performed.

[0345] In some embodiments, step S3103 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if terminal 101 successfully performs the failure handling operation, step S3103 may not be performed. For another example, if terminal 101 fails to perform the first cell handover mode in the first cell and performs RRC reestablishment according to relevant technologies, step S3103 may not be performed.

[0346] In some embodiments, step S3104 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if the terminal 101 determines that the conditions for reporting the RLF report are not met, step S3104 may not be performed.

[0347] In some embodiments, the execution order of step S3103 and step S3104 is not limited. For example, step S3103 may be executed first, and then step S3104. For another example, step S3104 may be executed first, and then step S3103.

[0348] In some embodiments, steps S3101 to S3104 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0349] In the above embodiment, when the terminal fails to perform the first cell handover mode in the first cell, the terminal can perform a failure processing operation according to the indication information, thereby reducing the delay of the terminal accessing the target cell and improving the reliability and availability of the NTN.

[0350] FIG3B is a flow chart of a failure handling method according to an embodiment of the present disclosure. As shown in FIG3B , the present disclosure embodiment relates to a failure handling method, which can be executed by the network device 102 and includes:

[0351] Step S3201, sending instruction information.

[0352] In some embodiments, the indication information is used to instruct the terminal 101 to perform a failure processing operation when the first cell switching mode fails to be executed in the first cell. The first cell may be the cell where the terminal 101 fails to execute the first cell switching mode.

[0353] In some embodiments, the network device 102-1 of the source cell sends the indication information to the terminal 101. In some embodiments, the terminal 101 receives the indication information.

[0354] In some embodiments, the optional implementation of step S3201 can refer to the optional implementation of step S2101 in Figure 2 and other related parts of the embodiment involved in Figure 2, which will not be repeated here.

[0355] Step S3202: Obtain an RRC reconfiguration completion message.

[0356] In some embodiments, the terminal 101 may send the RRC reconfiguration completion message to the network device 102-2 of the first cell when the first cell executes the second cell switching mode.

[0357] In some embodiments, the network device 102-2 of the first cell may receive a first RRC reconfiguration complete message sent by the terminal 101 using the parameters of the first cell in the saved RRC reconfiguration message.

[0358] In some embodiments, the network device 102-2 of the first cell can receive a second RRC reconfiguration completion message sent by the terminal 101, where the second RRC reconfiguration completion message is the RRC reconfiguration completion message sent to the first cell when the terminal 101 executes the first cell switching mode.

[0359] In some embodiments, the optional implementation of step S3202 can refer to the optional implementation of step S2102 in Figure 2 and other related parts of the embodiment involved in Figure 2, which will not be repeated here.

[0360] Step S3203: Determine the terminal status or determine whether the terminal performs a specified operation.

[0361] In some embodiments, the terminal state includes but is not limited to an RRC idle state.

[0362] In some embodiments, the designated operation includes, but is not limited to, an RRC re-establishment operation.

[0363] In some embodiments, when the network device 102-2 of the first cell determines that the terminal 101 fails to perform the above-mentioned failure processing operation again, it can determine that the terminal 101 enters the RRC idle state or performs RRC re-establishment.

[0364] In some embodiments, the optional implementation of step S3203 can refer to the optional implementation of step S2103 in Figure 2 and other related parts of the embodiment involved in Figure 2, which will not be repeated here.

[0365] Step S3204, obtain the report.

[0366] In some embodiments, the report is a RLF report.

[0367] In some embodiments, the network device 102 - 2 of the first cell may obtain the report from the terminal 101 , but is not limited thereto and may also receive reports sent by other entities.

[0368] In some embodiments, the network device 102 - 2 of the first cell obtains the content of the report determined according to a predefined rule.

[0369] In some embodiments, the network device 102 - 2 of the first cell performs processing to obtain the content of the report.

[0370] In some embodiments, step S3204 is omitted, the network device 102-2 of the first cell autonomously implements the function indicated by the report, or the network device 102 obtains the content of the report based on predefined rules or protocol agreements, or the above functions are default or default.

[0371] In some embodiments, the optional implementation of step S3204 can refer to the optional implementation of step S2104 in Figure 2 and other related parts of the embodiment involved in Figure 2, which will not be repeated here.

[0372] The communication method involved in the embodiments of the present disclosure may include at least one of steps S3201 to S3204. For example, step 3201 may be implemented as an independent embodiment, step S3202 may be implemented as an independent embodiment, steps S3201+S3202 may be implemented as an independent embodiment, step S3203 may be implemented as an independent embodiment, step S3204 may be implemented as an independent embodiment, and steps S3201 to S3204 may be implemented as independent embodiments, but are not limited thereto.

[0373] In some embodiments, step S3201 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if the terminal 101 determines, in accordance with a protocol or based on predefined rules, that a failure handling operation is performed when the first cell handover mode fails in the first cell, step S3201 may not be performed. For another example, if the network device serves as the network device of the first cell, step S3201 may not be performed.

[0374] In some embodiments, step S3202 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if terminal 101 skips cell search and performs RRC reestablishment, step S3202 may not be performed. For another example, if terminal 101 fails to perform the first cell handover method in the first cell and then performs RRC reestablishment according to relevant technologies, step S3202 may not be performed. For another example, if the network device serves as the network device of the source cell, step S3202 may not be performed.

[0375] In some embodiments, step S3203 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if terminal 101 successfully performs the failure handling operation, step S3203 may not be performed. For another example, if terminal 101 fails to perform the first cell handover mode in the first cell and then performs RRC reestablishment according to relevant technologies, step S3203 may not be performed. For another example, if the network device serves as the network device of the source cell, step S3203 may not be performed.

[0376] In some embodiments, step S3204 is optional, and one or more of these steps may be omitted or replaced in different embodiments. For example, if the network device determines that the conditions for submitting an RLF report are not met, step S3204 may not be performed. For another example, if the network device serves as the source cell's network device, step S3204 may not be performed.

[0377] In some embodiments, the order of executing step S3203 and step S3204 is not limited. For example, step S3203 may be executed first, and then step S3204. For another example, step S3204 may be executed first, and then step S3203.

[0378] In some embodiments, steps S3201 to S3204 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0379] For different terminals, the network device may simultaneously serve as the network device of the source cell and the network device of the first cell to perform the above steps S3201 to S3204.

[0380] In the above embodiment, the network device may instruct the terminal to perform a failure handling operation when the first cell fails to perform the first cell handover mode, thereby reducing the delay of the terminal accessing the target cell and improving the reliability and availability of the NTN.

[0381] The above process is further illustrated by the following examples:

[0382] In an embodiment of the present disclosure, a NTN network architecture diagram is provided, such as that shown in FIG4A , in which access network device 102-1 includes, but is not limited to, NTN control functions and access network functions of a ground system. NTN control functions include, but are not limited to, NTN load devices, such as satellites, and NTN gateway devices.

[0383] The terminal 101 may be connected to an NTN load device, such as a satellite, via a service link, and the load device may be connected to an NTN gateway device via a feeder link.

[0384] The access network device 102 - 1 may be connected to the core network device 102 - 2 via an NG interface.

[0385] The NTN network architecture described above shows that even if a terminal is stationary on the ground, it still needs to switch cells due to satellite movement. Therefore, for satellites in non-geosynchronous orbits, they move at high speed relative to their fixed positions on Earth, causing frequent and unavoidable handoffs between stationary and mobile terminals.

[0386] An example of the process of a terminal performing cell handover is shown in FIG4B :

[0387] Step S4201: The source base station sends a handover request (HANDOVER REQUEST) message to the target base station to initiate cell handover.

[0388] In step S4202, after performing admission control, the target base station sends a HANDOVER REQUEST ACKNOWLEDGE message to the source base station.

[0389] Step S4203: The source base station sends an RRC reconfiguration message to the terminal.

[0390] Step S4204: After switching to the target cell, the terminal sends an RRC reconfiguration completion message to the target base station.

[0391] In some embodiments, the terminal first sends MSG1, such as a random access preamble, to the target base station, and after receiving MSG2 sent by the target base station, sends an RRC reconfiguration completion message to the target base station.

[0392] As can be seen, a large number of terminals may initiate random access in the target cell at the same time, causing network congestion and subsequent random access failure. Furthermore, the terminal needs to perform random access before sending the RRC reconfiguration complete message, which increases the latency for the terminal to access the target cell.

[0393] For another example, the terminal performs a conditional handover (CHO), and the process may be as shown in FIG4C :

[0394] In step S4300, the source base station obtains mobility control information from the core network device.

[0395] Step S4301: The source base station performs measurement control on the terminal, and the terminal reports a measurement report.

[0396] Step S4302: The source base station performs CHO judgment.

[0397] Step S4303: The source base station sends a handover request message to the candidate base station.

[0398] Step S4304: The candidate base station performs admission control.

[0399] Step S4305: The candidate base station sends a handover request confirmation message to the source base station.

[0400] Step S4306: The source base station sends an RRC reconfiguration message to the terminal.

[0401] Step S4307: The terminal sends an RRC reconfiguration completion message to the source base station.

[0402] The terminal performs CHO condition evaluation, disconnects from the source cell, and synchronizes to the target cell.

[0403] Step S4307 - a , if early data forwarding is applied, the source base station may send an EARLY STATUS TRANSFER message to the candidate base station.

[0404] Step S4308, complete the conditional switching.

[0405] Step S4308-a: The target base station sends a HANDOVER SUCCESS message to the source base station, notifying the source base station that the terminal has successfully accessed the target base station.

[0406] In step S4308-b, the source base station sends a Sequence Number STATUS TRANSFER (SN STATUS TRANSFER) message to the target base station in return.

[0407] Step S4308-c: The source base station sends a HANDOVER CANCEL message to other candidate base stations (if there are other candidate base stations) to cancel the CHO of the terminal.

[0408] In step S4308, the terminal initiates a random access process in the target cell, completes uplink synchronization, and sends an RRC reconfiguration completion message to the target base station to complete the cell handover.

[0409] A large number of terminals may initiate random access in the target cell at the same time, causing network congestion and subsequent random access failure. Furthermore, the terminal needs to perform random access before sending an RRC reconfiguration complete message, which increases the latency for the terminal to access the target cell.

[0410] Consider allowing the terminal to perform RACH-less handover, that is, the terminal does not need to perform random access in the target cell, for example, it does not need to send MSG1 and receive MGS2, and can directly send an RRCReconfiguration complete message. That is, RACH-less handover means that when the UE switches to the target cell, it does not need to initiate a random access process in the target cell (no random access sequence needs to be sent to the target cell), but directly sends PUSCH based on the UL grant sent by the target cell, for example, sending an RRCReconfiguration complete message based on the UL grant. That is, RACH-less handover means that when the terminal switches to the target cell, it does not need to initiate a random access in the target cell. Random access-based handover means that when the terminal switches to the target cell, it first sends a random access sequence to obtain uplink synchronization, and then sends PUSCH.

[0411] Currently, during the cell handover process, the terminal starts the timer T304 and stops T304 after the handover is completed.

[0412] Specifically, if the RRC reconfiguration message received by the terminal contains reconfigurationWithSync, the terminal starts T304; if the terminal completes random access in the target cell, T304 is stopped. If the terminal cannot successfully switch to the target cell, T304 will time out, and the terminal will perform the RRC reestablishment process.

[0413] The RRC re-establishment process may be shown in FIG4D , including the following steps:

[0414] Step S4401: The terminal sends an RRC reestablishment request (RRCReestablishmentRequest) message to the network device.

[0415] Step S4402: The network device sends an RRC Reestablishment message to the terminal.

[0416] Step S4403: The terminal sends an RRC Reestablishment Complete (RRCReestablishmentComplete) message to the network device.

[0417] Alternatively, the RRC reestablishment process may be as shown in FIG4E , including the following steps:

[0418] Step S4501: The terminal sends an RRC reestablishment request (RRCReestablishmentRequest) message to the network device.

[0419] Step S4502: The network device sends an RRC setup (RRCSetup) message to the terminal.

[0420] Step S4503: The terminal sends an RRC setup complete (RRCSetupComplete) message to the network device.

[0421] For RRC re-establishment, the terminal first performs cell selection, selects a suitable cell (suitable), and then performs the above RRC re-establishment process in the cell.

[0422] For scenarios where RACH-less handover is supported, RACH-less handover is supported for intra-satellite handover with the same feeder link.

[0423] If RACH-based handover is performed, the terminal only needs to send a reconfiguration complete message in the target cell (excluding the preamble), as shown in FIG4F . The network device sends an RRC reconfiguration message to the terminal, and the terminal sends an RRC reconfiguration complete message to the network device.

[0424] According to the above handover process, if the terminal fails to perform RACH-less handover, RRC reestablishment will be performed. For RRC reestablishment, the terminal needs to first perform a cell search, select a suitable cell, and initiate a reestablishment request in the cell. In NTN scenarios, there may be only one candidate cell (for example, intra-satellite handover with the same feeder link), so cell selection is an unnecessary process. In addition, for NTN scenarios, compared to performing a RACH-based handover in the target cell, performing RRC reestablishment in the target cell will increase the latency for the terminal to connect to the target cell. Compared with terrestrial networks, the round-trip time (RTT) of NTN will be longer.

[0425] To reduce the latency of a terminal accessing a target cell in an NTN scenario, the present disclosure proposes that if the terminal fails to perform RACH less handover, the following operations may be performed:

[0426] You can enter the RRC reestablishment process, including any of the following:

[0427] The terminal skips the cell search and directly performs RRC reestablishment in the first cell where the RACH less handover fails.

[0428] The terminal skips the cell search and directly performs RACH-based handover in the first cell where RACH-less handover fails.

[0429] The terminal performs a cell search. If the selected cell is the first cell where RACH less handover failed previously, the terminal performs RACH based handover in this cell.

[0430] Alternatively, the terminal does not enter the RRC reestablishment process:

[0431] The terminal directly performs RACH based handover in the first cell where RACH less handover fails.

[0432] The present disclosure provides a method for handling a RACH less handover failure, including:

[0433] The terminal skips the cell search and directly performs RRC reestablishment in the first cell where RACH less handover fails;

[0434] The terminal skips the cell search and directly performs RACH-based handover in the first cell where RACH-less handover fails.

[0435] The terminal performs a cell search. If the selected cell is the first cell where RACH less handover failed, the terminal performs RACH based handover in this cell.

[0436] The terminal directly performs RACH based handover in the cell where RACH less handover fails.

[0437] Based on the above description, the terminal skips the cell search and directly performs RRC reestablishment in the first cell where the RACH less handover fails, including:

[0438] According to the instruction information sent by the network device, the terminal skips the cell search and directly performs RRC reestablishment in the first cell where the RACH less handover fails.

[0439] The instruction information includes:

[0440] The network device configures RACH less handover for the terminal;

[0441] The network device configures RACH resources for the terminal;

[0442] The network device sends indication information 1, which is used to instruct the terminal to skip cell search and directly perform RRC reestablishment in the first cell where RACH less handover fails.

[0443] The terminal skips the cell search and directly performs RACH-based handover on the first cell where RACH-less handover fails, including:

[0444] According to the instruction information sent by the network device, the terminal skips the cell search and performs RACH based handover in the cell where RACH less handover fails.

[0445] When the terminal performs RACH based handover directly in the first cell where RACH less handover fails, T304 is started;

[0446] When the terminal completes RACH based handover in the first cell where RACH less handover fails, T304 is stopped;

[0447] When the terminal performs RACH based handover directly in the first cell where RACH less handover fails, T311 is stopped; or when the terminal sends a preamble, T311 is stopped.

[0448] The instruction information includes:

[0449] The network device configures RACH less handover for the terminal;

[0450] The network device configures RACH resources for the terminal;

[0451] The network device sends indication information 2, which is used to instruct the terminal to skip cell search and perform RACH based handover in the cell where RACH less handover fails.

[0452] Based on the above description, the terminal performs a cell search. If the selected cell is the first cell in which RACH less handover failed previously, the terminal performs a RACH based handover in the cell, including:

[0453] When the terminal performs RRC reestablishment according to the instruction information sent by the network device, if the selected cell is the first cell where the RACH less handover failed before, the terminal performs RACH based handover in the cell.

[0454] The instruction information includes:

[0455] The network device configures RACH less handover for the terminal;

[0456] The network device configures RACH resources for the terminal;

[0457] The network device sends indication information 3, which is used to instruct the terminal to perform a cell search. If the selected cell is the first cell where RACH less handover failed previously, the terminal performs RACH based handover in the cell.

[0458] Based on the above description, the terminal directly performs RACH based handover in the cell where RACH less handover fails, including:

[0459] If the terminal fails to perform RACH less handover (T304 times out), if the network device configures RACH based handover fallback for the terminal, RRC reestablishment is not triggered;

[0460] If the terminal fails to perform RACH less handover (T304 times out), the terminal performs RACH base handover in the first cell.

[0461] The terminal directly performs RACH based handover in the first cell in which RACH less handover fails, including:

[0462] The terminal performs RACH based handover directly in the first cell where RACH less handover fails according to the instruction information sent by the network device.

[0463] The instruction information includes:

[0464] The network device configures RACH less handover for the terminal;

[0465] The network device configures RACH resources for the terminal;

[0466] The network device sends instruction information 4, which is used to instruct the terminal to directly perform RACH based handover in the first cell where RACH less handover fails.

[0467] In the above embodiment, when the terminal performs RACH based handover in the first cell, T304 is started;

[0468] When the terminal completes RACH based handover in the cell, T304 is stopped.

[0469] If the above RACH based handover fails, the terminal may perform RRC re-establishment.

[0470] Based on the above description, if the network device sends the indication information, the terminal does not restart the MAC layer and does not release the specified configuration. The specified configuration is the configuration of the first cell provided by the network device to the terminal.

[0471] Alternatively, if the network device does not send the indication information, the terminal restarts the MAC layer and releases the specified configuration.

[0472] In the above embodiment, performing RACH based handover in the first cell where RACH less handover fails includes:

[0473] Apply the parameters of the first cell in the RRC reconfiguration message saved by the terminal, where the parameters do not include RACH skip, UL grant, and TA parameters (or the terminal ignores the RACH skip, UL grant, and TA parameters in the parameters of the first cell);

[0474] Send a first RRC reconfiguration completion message to the first cell.

[0475] Alternatively, performing RACH based handover on the first cell in which RACH less handover fails includes:

[0476] A second RRC reconfiguration complete message is sent to the first cell again, where the second reconfiguration complete message is the reconfiguration complete message sent to the first cell during RACH less handover and saved by the terminal.

[0477] In the above embodiment, the terminal may report an RLF report, including:

[0478] Set lastHO-Type to RACH less handover.

[0479] In Example 1, terminal 101 determines that T304 has timed out and therefore determines that the first cell handover method has failed in the first cell. Terminal 101 does not trigger RRC reestablishment, but instead directly performs the second cell handover method in the first cell, namely, RACH-based handover, at which point T304 can be initiated. When T304 times out, it is considered that RACH-based handover in the first cell has failed, and RRC reestablishment is then performed.

[0480] In Example 2, terminal 101 determines that T304 has timed out and therefore determines that the first cell handover method has failed in the first cell. Terminal 101 enters the RRC reestablishment process, starts T311, skips the cell search, performs RRC reestablishment in the first cell, stops T311, and starts T304. If the RRC reestablishment is successful, T304 is stopped. If T304 times out, it indicates that the RRC reestablishment has failed, and terminal 101 can enter the RRC idle state.

[0481] In Example 3, terminal 101 determines that T304 has timed out and therefore determines that the first cell handover method has failed in the first cell. Terminal 101 enters the RRC reestablishment process, starts T311, but skips the cell search and directly performs the second cell handover method (i.e., RACH-based handover) in the first cell. Terminal 101 then stops T311 and starts T304. If the RACH-based handover is successful, T304 is stopped. If T304 times out, the RACH-based handover method has failed, and terminal 101 can enter the RRC idle state.

[0482] In Example 4, terminal 101 determines that T304 has timed out and therefore determines that the first cell handover method has failed in the first cell. Terminal 101 enters the RRC reestablishment process, starts T311, performs a cell search, and stops T311 when a suitable cell is selected. If the selected cell is the same as the first cell, the second cell handover method, i.e., RACH-based handover, is performed in the first cell, and T304 is started. If the RACH-based handover is successful, T304 is stopped. If T304 times out, it indicates that the RACH-based handover has failed, and terminal 101 can enter the RRC idle state.

[0483] In an NTN scenario, if a terminal fails to perform RACH less handover in the target cell, performing RRC reestablishment requires a new cell search, selecting a suitable cell, and then initiating an RRC reestablishment request message to the network device. In NTN scenarios, round-trip latency is significant, and the latency associated with performing the RRC reestablishment process and accessing the target cell is also significant.

[0484] By adopting the solution provided by the embodiment of the present disclosure, after the RACH less handover fails, the RACH based handover can be rolled back, thereby effectively shortening the delay of the terminal accessing the target cell, thereby improving the reliability and availability of the NTN.

[0485] The embodiments of the present disclosure further provide an apparatus for implementing any of the above methods. For example, an apparatus is provided, comprising units or modules for implementing each step performed by a terminal in any of the above methods. For another example, another apparatus is provided, comprising units or modules for implementing each step performed by a network device (e.g., an access network device, a core network device, etc.) in any of the above methods.

[0486] It should be understood that the division of the various units or modules in the above device is merely a division of logical functions. In actual implementation, they may be fully or partially integrated into a physical entity, or they may be physically separated. In addition, the units or modules in the device may be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and the memory stores instructions. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the various units or modules of the above device, wherein the processor is, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory within the device or a memory outside the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits, and the functions of some or all of the units or modules can be realized by designing the hardware circuits. The above-mentioned hardware circuits can be understood as one or more processors; for example, in one implementation, the above-mentioned hardware circuit is an application-specific integrated circuit (ASIC), which realizes the functions of some or all of the above units or modules by designing the logical relationship of the components in the circuit; for example, in another implementation, the above-mentioned hardware circuit can be realized by a programmable logic device (PLD). Taking a field programmable gate array (FPGA) as an example, it can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by configuring the configuration file, thereby realizing the functions of some or all of the above units or modules. All units or modules of the above devices can be realized in the form of software called by the processor, or in the form of hardware circuits, or in part by the form of software called by the processor, and the rest by hardware circuits.

[0487] In the embodiments of the present disclosure, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction reading and execution capabilities, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationship of the hardware circuit. The logical relationship of the above-mentioned hardware circuit is fixed or reconfigurable. For example, the processor is a hardware circuit implemented by an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and implementing the hardware circuit configuration can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc.

[0488] FIG5A is a schematic diagram of the structure of a terminal proposed in an embodiment of the present disclosure. As shown in FIG5A , a terminal 5100 may include: a processing module 5101 .

[0489] In some embodiments, the processing module 5101 is configured to execute a failure handling operation if the first cell handover mode fails in the first cell;

[0490] The failure handling operation includes any of the following:

[0491] The terminal skips the cell search and performs RRC reestablishment in the first cell;

[0492] The terminal skips the cell search and performs the second cell handover mode in the first cell;

[0493] When the cell selected by the terminal through the cell search is the same as the first cell, performing the second cell handover mode in the first cell;

[0494] The terminal does not perform RRC re-establishment, but performs the second cell switching mode in the first cell.

[0495] In some embodiments, the terminal 5100 may include a transceiver module 5102 (not shown in FIG. 5A ), where the transceiver module 5102 is configured to receive indication information sent by a network device, where the indication information is used to instruct the terminal to perform a failure processing operation when the first cell fails to perform the first cell handover mode.

[0496] The failure handling operation includes any of the following:

[0497] The terminal skips the cell search and performs RRC reestablishment in the first cell;

[0498] The terminal skips the cell search and performs the second cell handover mode in the first cell;

[0499] When the cell selected by the terminal through the cell search is the same as the first cell, performing the second cell handover mode in the first cell;

[0500] The terminal does not perform RRC re-establishment, but performs the second cell switching mode in the first cell.

[0501] Optionally, the processing module 5101 is configured to execute at least one of the other steps (eg, step S2102, step S2103, step S2104, but not limited thereto) executed by the first network device 101 in any of the above methods, which will not be described in detail here.

[0502] Optionally, the above-mentioned transceiver module 5102 is used to execute at least one of the communication steps such as sending and / or receiving (such as step S2101, but not limited to this) performed by the terminal 5100 in any of the above methods, which will not be repeated here.

[0503] FIG5B is a schematic diagram of the structure of a network device according to an embodiment of the present disclosure. As shown in FIG5B , the network device 5200 may include a transceiver module 5201 .

[0504] In some embodiments, the transceiver module 5201 is configured to send indication information to the terminal, wherein the indication information is used to instruct the terminal to perform a failure processing operation when the first cell fails to perform the first cell handover mode;

[0505] The failure handling operation includes any of the following:

[0506] The terminal skips the cell search and performs RRC reestablishment in the first cell;

[0507] The terminal skips the cell search and performs the second cell handover mode in the first cell;

[0508] When the cell selected by the terminal through the cell search is the same as the first cell, performing the second cell handover mode in the first cell;

[0509] The terminal does not perform RRC re-establishment, but performs the second cell switching mode in the first cell.

[0510] Optionally, the above-mentioned transceiver module 5201 is used to execute at least one of the communication steps such as sending and / or receiving that can be executed by the second network device 5200 in any of the above methods (such as step S2101, but not limited to this), which will not be repeated here.

[0511] In some embodiments, the transceiver module may include a transmitting module and / or a receiving module, and the transmitting module and the receiving module may be separate or integrated. Optionally, the transceiver module may be interchangeable with the transceiver.

[0512] In some embodiments, the processing module can be a single module or can include multiple submodules. Optionally, the multiple submodules respectively execute all or part of the steps required to be executed by the processing module. Optionally, the processing module can be interchangeable with the processor.

[0513] Figure 6A is a schematic diagram of the structure of a communication device 6100 proposed in an embodiment of the present disclosure. Communication device 6100 can be a network device (e.g., a core network device, an access network device, etc.), a terminal (e.g., a user equipment, etc.), a chip, a chip system, or a processor that supports a core network device in implementing any of the above methods, or a chip, a chip system, or a processor that supports a terminal in implementing any of the above methods. Communication device 6100 can be used to implement the methods described in the above method embodiments. For details, please refer to the description of the above method embodiments.

[0514] As shown in Figure 6A, the communication device 6100 includes one or more processors 6101. Processor 6101 can be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, and the central processing unit can be used to control the communication device (such as a base station, baseband chip, terminal device, terminal device chip, DU or CU, etc.), execute programs, and process program data. The communication device 6100 is used to perform any of the above methods.

[0515] In some embodiments, the communication device 6100 further includes one or more memories 6102 for storing instructions. Optionally, all or part of the memories 6102 may be located outside the communication device 6100.

[0516] In some embodiments, the communication device 6100 further includes one or more transceivers 6103. When the communication device 6100 includes one or more transceivers 6103, the transceiver 6103 performs at least one of the communication steps such as sending and / or receiving in the above method (for example, step S2101, but not limited thereto), and the processor 6101 performs at least one of the other steps (steps S2102, S2103, S2104, and S2105, but not limited thereto).

[0517] In some embodiments, a transceiver may include a receiver and / or a transmitter. The receiver and transmitter may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, and transceiver circuit may be used interchangeably; the terms transmitter, transmitting unit, transmitter, and transmitting circuit may be used interchangeably; and the terms receiver, receiving unit, receiver, and receiving circuit may be used interchangeably.

[0518] In some embodiments, the communication device 6100 may include one or more interface circuits 6104. Optionally, the interface circuit 6104 is connected to the memory 6102. The interface circuit 6104 may be configured to receive signals from the memory 6102 or other devices, and may be configured to send signals to the memory 6102 or other devices. For example, the interface circuit 6104 may read instructions stored in the memory 6102 and send the instructions to the processor 6101.

[0519] The communication device 6100 described in the above embodiment may be a network device or a terminal, but the scope of the communication device 6100 described in the present disclosure is not limited thereto, and the structure of the communication device 6100 may not be limited to FIG6A. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: 1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data and programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, an in-vehicle device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

[0520] 6B is a schematic diagram of the structure of a chip 6200 according to an embodiment of the present disclosure. If the communication device 6200 can be a chip or a chip system, please refer to the schematic diagram of the structure of the chip 6200 shown in FIG6B , but the present disclosure is not limited thereto.

[0521] The chip 6200 includes one or more processors 6201 , and the chip 6200 is configured to execute any of the above methods.

[0522] In some embodiments, the chip 6200 further includes one or more interface circuits 6202. Optionally, the interface circuit 6202 is connected to the memory 6203. The interface circuit 6202 can be used to receive signals from the memory 6203 or other devices, and can be used to send signals to the memory 6203 or other devices. For example, the interface circuit 6202 can read instructions stored in the memory 6203 and send the instructions to the processor 6201.

[0523] In some embodiments, the interface circuit 6202 performs at least one of the communication steps such as sending and / or receiving in the above method (for example, step S2101, but not limited to this), and the processor 6201 performs at least one of the other steps (step S2102, step S2103, step S2104, step S2105, but not limited to this).

[0524] In some embodiments, terms such as interface circuit, interface, transceiver pin, and transceiver may be used interchangeably.

[0525] In some embodiments, the chip 6200 further includes one or more memories 6203 for storing instructions. Alternatively, all or part of the memories 6203 may be located outside the chip 6200.

[0526] The present disclosure also proposes a storage medium having instructions stored thereon. When the instructions are executed on the communication device 6100, the communication device 6100 executes any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited thereto and may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but is not limited thereto and may also be a transient storage medium.

[0527] The present disclosure also provides a program product, which, when executed by the communication device 6100, enables the communication device 6100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0528] The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to perform any one of the above methods.

[0529] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the following claims.

[0530] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A failure handling method, characterized in that: include: Executing the first cell switching mode fails in the first cell, and executing a failure processing operation; The failure handling operation includes any of the following: The terminal skips the cell search and performs RRC reestablishment in the first cell; The terminal skips the cell search and performs the second cell switching mode in the first cell; When the cell selected by the terminal through the cell search is the same cell as the first cell, performing the second cell switching mode in the first cell; The terminal does not perform RRC reconstruction, but performs the second cell switching mode in the first cell.

2. The method according to claim 1, characterized in that The terminal does not perform RRC reestablishment, but performs the second cell switching mode in the first cell, including at least one of the following: Execution of the first cell switching mode fails, and the network equipment of the source cell configures fallback of the second cell switching mode for the terminal, and the terminal does not perform RRC reconstruction; If the execution of the first cell switching method fails, the terminal executes the second cell switching method in the first cell.

3. The method according to claim 1 or 2, characterized in that: The method further comprises at least one of the following: When the first cell executes the second cell switching mode, starting a first timer and / or stopping a second timer; When the first cell sends a random access preamble code, start a first timer and / or stop a second timer.

4. The method according to any one of claims 1 to 3, characterized in that: The method further comprises any of the following: The terminal skips the cell search, fails to perform the RRC reestablishment in the first cell, and enters the radio resource control RRC idle state; The terminal skips the cell search, fails to perform the second cell switching mode in the first cell, and enters the RRC idle state; When the cell selected by the terminal through the cell search is the same cell as the first cell and the first cell fails to perform the second cell switching mode, the terminal enters the RRC idle state; The terminal does not perform RRC reconstruction, and if the second cell switching mode fails, performs RRC reconstruction.

5. The method according to any one of claims 1 to 4, characterized in that: The method further comprises: Indication information sent by a network device of a source cell is received, where the indication information is used to instruct the terminal to perform the failure processing operation when the first cell fails to perform the first cell switching mode.

6. The method according to claim 5, characterized in that The indication information is used for at least one of the following: Configuring the first cell switching mode for the terminal; configuring random access resources for the terminal; Indicates the failure handling operation.

7. The method according to any one of claims 1 to 6, characterized in that: The execution failure processing operation includes at least one of the following: Do not restart the media access control MAC layer; The designated configuration is not released, where the designated configuration is the configuration of the first cell provided by the network equipment of the source cell for the terminal.

8. The method according to any one of claims 1 to 7, characterized in that: The performing the second cell switching mode in the first cell includes: Using the parameters of the first cell in the saved RRC reconfiguration message, a first RRC reconfiguration complete message is sent to the network equipment of the first cell.

9. The method according to any one of claims 1 to 7, characterized in that: The performing the second cell switching mode in the first cell includes: A second RRC reconfiguration completion message is sent again to the network device of the first cell, where the second RRC reconfiguration completion message is the RRC reconfiguration completion message sent by the terminal to the network device of the first cell when the terminal executes the first cell switching mode.

10. The method according to any one of claims 1 to 9, characterized in that: The method further comprises: Report a radio link failure RLF report to the network equipment of the first cell; wherein the RLF report includes a previous switching type, and the previous switching type corresponds to the first cell switching mode.

11. The method according to any one of claims 1 to 10, characterized in that: The first cell switching mode is a cell switching mode in which a random access process is not initiated in the target cell during the switching process; and / or The second cell switching mode is a cell switching mode in which a random access process is initiated in the target cell during the switching process.

12. A failure handling method, characterized in that: include: Sending indication information to the terminal, the indication information is used to instruct the terminal to fail to perform the first cell switching mode in the first cell Execute failure handling operations when failure occurs; The failure handling operation includes any of the following: The terminal skips the cell search and performs RRC reestablishment in the first cell; The terminal skips the cell search and performs the second cell switching mode in the first cell; When the cell selected by the terminal through the cell search is the same cell as the first cell, performing the second cell switching mode in the first cell; The terminal does not perform RRC reconstruction, but performs the second cell switching mode in the first cell.

13. The method according to claim 12, characterized in that The terminal does not perform RRC reestablishment, but performs the second cell switching mode in the first cell, including at least one of the following: Execution of the first cell switching mode fails, and the network device of the source cell of the terminal configures fallback of the second cell switching mode for the terminal, and the terminal does not perform RRC reconstruction; If the execution of the first cell switching method fails, the terminal executes the second cell switching method in the first cell.

14. The method according to claim 12 or 13, characterized in that The method further comprises any of the following: Determining that the terminal skips the cell search and fails to perform the RRC reestablishment in the first cell, and determining that the terminal enters a radio resource control RRC idle state; Determining that the terminal skips cell search, fails to perform the second cell switching mode in the first cell, and determining that the terminal enters an RRC idle state; determining that a cell selected by the terminal through cell search is the same cell as the first cell, and that execution of the second cell switching mode in the first cell fails, and determining that the terminal enters an RRC idle state; It is determined that the terminal does not perform RRC reconstruction, and the execution of the second cell switching mode fails, and it is determined that the terminal performs RRC reconstruction.

15. The method according to any one of claims 12 to 14, characterized in that: The execution failure processing operation includes at least one of the following: Do not restart the media access control MAC layer; The designated configuration is not released, where the designated configuration is the configuration of the first cell provided by a network device of a source cell of the terminal for the terminal.

16. The method according to any one of claims 12 to 15, characterized in that: The indication information is used for at least one of the following: configuring the first cell switching mode for the terminal; configuring random access resources for the terminal; Indicates the failure handling operation.

17. The method according to any one of claims 12 to 16, characterized in that: The method further comprises: Receive a first RRC reconfiguration complete message sent by the terminal using the parameters of the first cell in the saved RRC reconfiguration message.

18. The method according to any one of claims 12 to 16, characterized in that: The method further comprises: A second RRC reconfiguration completion message is received which is sent again by the terminal. The second RRC reconfiguration completion message is an RRC reconfiguration completion message sent by the terminal to the network device of the first cell when executing the first cell switching mode.

19. The method according to any one of claims 12 to 18, characterized in that: The method further comprises: Receive a radio link failure RLF report reported by the terminal; wherein the RLF report includes a previous switching type, and the previous switching type corresponds to the first cell switching mode.

20. The method according to any one of claims 12 to 19, characterized in that: The first cell switching mode is a cell switching mode in which a random access process is not initiated in the target cell during the switching process; and / or The second cell switching mode is a cell switching mode in which a random access process is initiated in the target cell during the switching process.

21. A terminal, characterized in that: include: A processing module is configured to execute a failure processing operation when the first cell switching mode fails in the first cell; The failure handling operation includes any of the following: The terminal skips the cell search and performs RRC reestablishment in the first cell; The terminal skips the cell search and performs the second cell switching mode in the first cell; When the cell selected by the terminal through the cell search is the same cell as the first cell, performing the second cell switching mode in the first cell; The terminal does not perform RRC reconstruction, but performs the second cell switching mode in the first cell.

22. A network device, characterized in that: include: A transceiver module is configured to send indication information to a terminal, wherein the indication information is used to instruct the terminal to perform a failure processing operation when the first cell fails to perform the first cell switching mode; The failure handling operation includes any of the following: The terminal skips the cell search and performs RRC reestablishment in the first cell; The terminal skips the cell search and performs the second cell switching mode in the first cell; When the cell selected by the terminal through the cell search is the same cell as the first cell, performing the second cell switching mode in the first cell; The terminal does not perform RRC reconstruction, but performs the second cell switching mode in the first cell.

23. A terminal, characterized in that: include: one or more processors; Wherein, the network device is used to execute the failure handling method described in any one of claims 1-11.

24. A network device, characterized in that: include: one or more processors; Wherein, the terminal is used to execute the method for failure handling behavior described in any one of claims 12-20.

25. A storage medium storing instructions, characterized in that: When the instruction is executed on the communication device, the communication device executes the failure handling method as described in any one of claims 1-11 or 12-20.

26. A communication system, characterized in that: It comprises a terminal and a network device, wherein the terminal is configured to implement the failure processing method described in any one of claims 1-11, and the network device is configured to implement the failure processing method described in any one of claims 12-20.

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