Connection establishment method, device, and storage medium

Abstract

The present disclosure relates to a connection establishment method, a device, and a storage medium. The method comprises: a remote terminal receives a first instruction, wherein the first instruction is an instruction sent when a first relay terminal determines a connection failure, and determines whether to maintain a connection with the first relay terminal. Therefore, when determining a connection failure, a first relay terminal can send a first instruction to a remote terminal, on the basis of the first instruction, the remote terminal can determine whether to maintain a connection with the first relay terminal, and when determining to maintain a connection with the first relay terminal, the remote terminal re-establishes a connection with the first relay terminal, so that the signaling overhead can be saved.

Description

Connection establishment method, device and storage medium Technical Field

[0001] The present disclosure relates to the field of communication technologies, and in particular to a connection establishment method, device, and storage medium. Background Art

[0002] Remote user equipment (UE) can communicate with network devices through relay UEs instead of directly connecting to them. When the radio resource control (RRC) connection of the relay UE fails, a notification message is sent to the connected remote UE via a direct link. When the remote UE receives the notification message, it triggers RRC connection reestablishment.

[0003] Summary of the Invention

[0004] The embodiments of the present disclosure provide a connection establishment method, device, and storage medium.

[0005] According to a first aspect of an embodiment of the present disclosure, a connection establishment method is provided, the method comprising:

[0006] The remote terminal receives a first indication; the first indication is an indication sent by the first relay terminal when determining that the connection has failed;

[0007] Determine whether to maintain the connection with the first relay terminal.

[0008] According to a second aspect of an embodiment of the present disclosure, a connection establishment method is provided, the method comprising:

[0009] The first relay terminal determines that the connection fails;

[0010] A first indication is sent to a remote terminal, where the first indication is used by the remote terminal to determine whether to maintain a connection with the first relay terminal.

[0011] According to a third aspect of an embodiment of the present disclosure, a connection establishment method is provided, the method comprising:

[0012] The network device sends first configuration information to a remote terminal, where the first configuration information indicates whether the remote terminal maintains a connection with the first relay terminal when a connection with the first relay terminal fails.

[0013] According to a fourth aspect of an embodiment of the present disclosure, a connection establishment method is provided, the method comprising:

[0014] The first relay terminal determines that the connection fails;

[0015] The first relay terminal sends a first indication to the remote terminal, where the first indication is used by the remote terminal to determine whether to maintain a connection with the first relay terminal;

[0016] The remote terminal determines whether to maintain the connection with the first relay terminal.

[0017] According to a fifth aspect of an embodiment of the present disclosure, there is provided a remote terminal, including:

[0018] a transceiver module configured to receive a first indication; the first indication is an indication sent by the first relay terminal when determining that the connection fails;

[0019] The processing module is configured to determine whether to maintain the connection with the first relay terminal.

[0020] According to a sixth aspect of an embodiment of the present disclosure, there is provided a first relay terminal, including:

[0021] a processing module configured to determine a connection failure;

[0022] The transceiver module is configured to send a first indication to the remote terminal, where the first indication is used by the remote terminal to determine whether to maintain the connection with the first relay terminal.

[0023] According to a seventh aspect of an embodiment of the present disclosure, a network device is provided, including:

[0024] The transceiver module is configured to send first configuration information to the remote terminal, where the first configuration information indicates whether the remote terminal maintains the connection with the first relay terminal when the connection with the first relay terminal fails.

[0025] According to an eighth aspect of an embodiment of the present disclosure, there is provided a remote terminal, including:

[0026] one or more processors;

[0027] The remote terminal may be used to execute the optional implementation of the first aspect.

[0028] According to a ninth aspect of an embodiment of the present disclosure, there is provided a first relay terminal, including:

[0029] one or more processors;

[0030] The remote terminal may be used to execute the optional implementation of the second aspect.

[0031] According to a tenth aspect of an embodiment of the present disclosure, a network device is provided, including:

[0032] one or more processors;

[0033] Among them, the network device can be used to execute the optional implementation of the third aspect.

[0034] According to the eleventh aspect of an embodiment of the present disclosure, a communication system is provided, which may include a remote terminal, a first relay terminal and a network device, wherein the remote terminal is configured to execute the method described in the optional implementation manner of the first aspect, the first relay terminal is configured to execute the method described in the optional implementation manner of the second aspect, and the network device is configured to execute the method described in the optional implementation manner of the third aspect.

[0035] According to the twelfth aspect of an embodiment of the present disclosure, a storage medium is provided, which stores instructions. When the instructions are executed on a communication device, the communication device executes the method described in the optional implementation of the first aspect, the second aspect, or the third aspect.

[0036] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the remote terminal receives a first indication; the first indication is an indication sent by the first relay terminal when determining that the connection has failed; and the remote terminal determines whether to maintain the connection with the first relay terminal. Thus, when the first relay terminal determines that the connection has failed, it may send the first indication to the remote terminal, and the remote terminal may determine whether to maintain the connection with the first relay terminal based on the first indication. If the remote terminal determines to maintain the connection with the first relay terminal, it may reestablish the connection together with the first relay terminal, thereby saving signaling overhead.

[0037] 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

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following drawings required for describing the embodiments are introduced. The following drawings are merely some embodiments of the present disclosure and do not impose specific limitations on the protection scope of the present disclosure.

[0039] FIG1A is a schematic diagram showing the architecture of a communication system according to an embodiment of the present disclosure.

[0040] FIG1B is a schematic diagram showing a business data transmission according to an embodiment of the present disclosure.

[0041] FIG2 is an interactive schematic diagram illustrating a connection establishment method according to an embodiment of the present disclosure.

[0042] FIG3A is a schematic flow chart showing a connection establishment method according to an embodiment of the present disclosure.

[0043] FIG3B is a schematic flow chart of a connection establishment method according to an embodiment of the present disclosure.

[0044] FIG3C is a flow chart illustrating a method for establishing a connection according to an embodiment of the present disclosure.

[0045] FIG3D is a flow chart illustrating a method for establishing a connection according to an embodiment of the present disclosure.

[0046] FIG4A is a schematic flow chart showing a connection establishment method according to an embodiment of the present disclosure.

[0047] FIG4B is a schematic flow chart showing a connection establishment method according to an embodiment of the present disclosure.

[0048] FIG4C is a flow chart illustrating a method for establishing a connection according to an embodiment of the present disclosure.

[0049] FIG4D is a schematic flow chart of a connection establishment method according to an embodiment of the present disclosure.

[0050] FIG5A is a schematic flow chart showing a method for establishing a connection according to an embodiment of the present disclosure.

[0051] FIG5B is a schematic flow chart of a connection establishment method according to an embodiment of the present disclosure.

[0052] FIG5C is a flow chart illustrating a method for establishing a connection according to an embodiment of the present disclosure.

[0053] FIG6 is an interactive schematic diagram illustrating a connection establishment method according to an embodiment of the present disclosure.

[0054] FIG7A is a schematic structural diagram of a remote terminal proposed in an embodiment of the present disclosure.

[0055] FIG7B is a schematic structural diagram of a first relay terminal proposed in an embodiment of the present disclosure.

[0056] FIG7C is a schematic structural diagram of a network device proposed in an embodiment of the present disclosure.

[0057] FIG8A is a schematic structural diagram of a communication device proposed in an embodiment of the present disclosure.

[0058] FIG8B is a schematic structural diagram of a chip proposed in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0059] The embodiments of the present disclosure provide a connection establishment method, device, and storage medium.

[0060] In a first aspect, an embodiment of the present disclosure provides a connection establishment method, the method comprising:

[0061] The remote terminal receives a first indication; the first indication is an indication sent by the first relay terminal when determining that the connection has failed;

[0062] Determine whether to maintain the connection with the first relay terminal.

[0063] In the above embodiment, the remote terminal can receive the first indication sent by the first relay terminal when determining that the connection fails, and choose whether to maintain the connection with the first relay terminal, thereby being able to choose a way to reestablish the connection, thereby improving the flexibility of connection establishment.

[0064] In conjunction with some embodiments of the first aspect, in some embodiments, determining whether to maintain the connection with the first relay terminal includes:

[0065] Determine to maintain the connection with the first relay terminal.

[0066] In the above embodiment, the remote terminal can receive the first indication sent by the first relay terminal when determining that the connection fails, maintain the connection with the first relay terminal, and reestablish the connection together with the first relay terminal, thereby saving signaling overhead.

[0067] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0068] The second indication is sent to the first relay terminal, where the second indication is used to instruct the first relay terminal to maintain the connection with the remote terminal.

[0069] In the above embodiment, after the remote terminal determines to maintain the connection with the first relay terminal, it can send a second instruction to the first relay terminal so that the first relay terminal can reestablish the connection with the remote terminal, thereby saving signaling overhead.

[0070] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0071] A third indication is received, where the third indication is an indication sent by the first relay terminal when determining that the connection reestablishment is successful.

[0072] In the above embodiment, the remote terminal can receive the indication sent by the first relay terminal when the connection is successfully reestablished, so that the remote terminal can promptly resume the service suspended when the first relay terminal fails to connect, thereby improving the service quality of the remote terminal.

[0073] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0074] receiving a fourth indication, where the fourth indication is an indication sent by the network device after receiving the first connection reestablishment request sent by the first relay terminal;

[0075] Perform radio bearer transmission according to the fourth instruction.

[0076] In the above embodiment, the network device may receive the first connection reestablishment request sent by the first relay terminal, and send a fourth indication to the remote terminal. The remote terminal may perform radio bearer transmission according to the fourth indication, thereby improving the service quality of the remote terminal.

[0077] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0078] determining that the connection reestablishment of the first relay terminal fails;

[0079] A second connection reestablishment request is sent to the network device through the first cell or the second relay terminal that meets the first preset channel quality condition.

[0080] In the above embodiment, the remote terminal can reestablish the connection through the first cell or the second relay terminal that meets the first preset channel quality condition, thereby improving the reliability of the connection reestablishment.

[0081] In conjunction with some embodiments of the first aspect, in some embodiments, determining that the connection reestablishment of the first relay terminal fails includes at least one of the following:

[0082] receiving a fifth indication, where the fifth indication is an indication sent by the first relay terminal when determining that the connection reestablishment fails;

[0083] It is determined that a first timer has timed out, where the first timer is started when it is determined to maintain the connection with the first relay terminal.

[0084] In the above embodiment, the remote terminal can judge whether the reconnection of the first relay terminal fails in a variety of ways, thereby improving the reliability of the judgment.

[0085] In conjunction with some embodiments of the first aspect, in some embodiments, determining whether to maintain the connection with the first relay terminal includes:

[0086] determining not to maintain the connection with the first relay terminal;

[0087] The method further comprises:

[0088] A second connection reestablishment request is sent to the network device through the first cell or the second relay terminal that meets the first preset channel quality condition.

[0089] In the above embodiment, the remote terminal can release the connection with the first relay terminal and reestablish the connection through the first cell or the second relay terminal that meets the first preset channel quality condition, thereby improving the reliability of the connection reestablishment.

[0090] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0091] receiving first configuration information sent by a network device, where the first configuration information indicates whether the remote terminal maintains a connection with the first relay terminal when the connection with the first relay terminal fails;

[0092] The determining whether to maintain the connection with the first relay terminal includes:

[0093] Determine whether to maintain the connection with the first relay terminal according to the first configuration information.

[0094] In the above embodiment, the network device can send the first configuration information to the remote terminal. When the remote terminal determines that the connection with the first relay terminal fails, it can determine whether to maintain the connection with the first relay terminal based on the first configuration information, making the method of indicating connection reconstruction more flexible.

[0095] In a second aspect, an embodiment of the present disclosure provides a connection establishment method, the method comprising:

[0096] The first relay terminal determines that the connection fails;

[0097] A first indication is sent to a remote terminal, where the first indication is used by the remote terminal to determine whether to maintain a connection with the first relay terminal.

[0098] In the above embodiment, when the first relay terminal determines that the connection fails, it can send a first indication to the remote terminal. The remote terminal can choose whether to maintain the connection with the first relay terminal, and thus can choose a way to reestablish the connection, thereby improving the flexibility of connection establishment.

[0099] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0100] receiving a second indication sent by the remote terminal;

[0101] Maintain the connection with the remote terminal according to the second instruction.

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

[0103] According to the second indication, a sixth indication is sent to the network device through a second cell or a third relay terminal that meets a second preset channel quality condition, where the sixth indication is used to instruct the reestablishment of the connection with the remote terminal.

[0104] In the above embodiment, the first relay terminal can instruct the network device to reestablish the connection with the remote terminal through the second cell or the third relay terminal, thereby improving the flexibility of the remote terminal connection reestablishment.

[0105] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0106] receiving a seventh instruction sent by the network device;

[0107] Maintaining the connection with the remote terminal according to the seventh instruction.

[0108] In the above embodiment, the first relay terminal can maintain the connection with the remote terminal according to the instruction of the network device, so that the method of instructing the connection maintenance is more flexible.

[0109] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0110] According to the seventh indication, a sixth indication is sent to the network device through the second cell or the third relay terminal that meets the second preset channel quality condition, where the sixth indication is used to instruct the reestablishment of the connection with the remote terminal.

[0111] In the above embodiment, the first relay terminal can instruct the network device to reestablish the connection with the remote terminal through the second cell or the third relay terminal, thereby improving the flexibility of the remote terminal connection reestablishment.

[0112] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0113] A first connection reestablishment request is sent to the network device through the second cell or the third relay terminal that meets the second preset channel quality condition.

[0114] In the above embodiment, the first relay terminal can reestablish the connection through the second cell or the third relay terminal that meets the second preset channel quality condition, thereby improving the reliability of the connection reestablishment.

[0115] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0116] receiving an eighth indication sent by the network device through the second cell or the third relay terminal, where the eighth indication is an indication sent by the network device when determining that the connection with the first relay terminal and the remote terminal is successfully reestablished;

[0117] Maintaining the connection with the remote terminal according to the eighth instruction.

[0118] In the above embodiment, after the network device determines that the connection of the remote terminal is successfully reestablished, it can send an eighth indication to the first relay terminal. The first relay terminal can maintain a connection with the remote terminal based on the eighth indication. In this way, the remote terminal can communicate with the network device through the first relay terminal, and the service of the remote terminal can be restored in time, thereby improving the service quality of the remote terminal.

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

[0120] Determining that the connection with the first relay terminal is successfully reestablished;

[0121] Sending a third indication to the remote terminal.

[0122] In conjunction with some embodiments of the second aspect, in some embodiments, it is determined that the connection reestablishment of the first relay terminal fails;

[0123] A fifth indication is sent to the remote terminal, where the fifth indication is used to instruct the remote terminal to reestablish the connection.

[0124] In conjunction with some embodiments of the second aspect, in some embodiments, determining that the connection reestablishment of the first relay terminal fails includes at least one of the following:

[0125] determining that the second cell does not support relay operations;

[0126] determining that the second cell does not support a direct link;

[0127] determining that the second cell does not meet the second preset channel quality condition;

[0128] Determining that the third relay terminal does not meet the second preset channel quality condition;

[0129] determining that a second timer has timed out, where the second timer is started when a first connection reestablishment request is sent to the network device;

[0130] A ninth indication sent by the network device is received, where the ninth indication is an indication sent by the network device when determining that the connection reestablishment of the remote terminal fails.

[0131] In the above embodiment, the first relay terminal can judge whether the reconnection fails in a variety of ways, thereby improving the reliability of the judgment.

[0132] In combination with some embodiments of the second aspect, in some embodiments, the fifth indication includes failure information of connection reestablishment failure of the first relay terminal.

[0133] In the above embodiment, the first relay terminal may send failure information of connection reestablishment failure to the remote terminal, so that the remote terminal can make a further decision on connection reestablishment based on the failure information, thereby improving the flexibility of connection reestablishment.

[0134] In combination with some embodiments of the second aspect, in some embodiments, the sixth indication includes a terminal identifier of the remote terminal.

[0135] In the above embodiment, the first relay terminal can instruct the network device to reestablish the connection with the remote terminal through the terminal identifier of the remote terminal, which simplifies the process of instructing to reestablish the connection and improves the efficiency of connection reestablishment.

[0136] In combination with some embodiments of the second aspect, in some embodiments, the seventh indication includes a terminal identifier of the remote terminal.

[0137] In the above embodiment, the network device can instruct the first relay terminal to maintain connection with the remote terminal through the terminal identifier of the remote terminal, which simplifies the process of instructing connection maintenance and improves the efficiency of connection reestablishment.

[0138] In a third aspect, an embodiment of the present disclosure provides a connection establishment method, the method comprising:

[0139] The network device sends first configuration information to a remote terminal, where the first configuration information indicates whether the remote terminal maintains a connection with the first relay terminal when a connection with the first relay terminal fails.

[0140] In the above embodiment, the network device can send the first configuration information to the remote terminal. When the remote terminal determines that the connection with the first relay terminal fails, it can determine whether to maintain the connection with the first relay terminal based on the first configuration information, making the method of indicating connection reconstruction more flexible.

[0141] In conjunction with some embodiments of the third aspect, in some embodiments, the method further includes:

[0142] A seventh indication is sent to the first relay terminal, where the seventh indication is used to instruct the first relay terminal to maintain the connection with the remote terminal.

[0143] In conjunction with some embodiments of the third aspect, in some embodiments, the method further includes:

[0144] receiving a sixth indication sent by the first relay terminal;

[0145] Reestablish the connection with the remote terminal according to the sixth indication.

[0146] In conjunction with some embodiments of the third aspect, in some embodiments, the method further includes:

[0147] receiving a first connection reestablishment request sent by the first relay terminal;

[0148] Reestablishing the connection with the first relay terminal according to the first connection reestablishment request.

[0149] In conjunction with some embodiments of the third aspect, in some embodiments, the method further includes:

[0150] Determining that the connection with the first relay terminal and the remote terminal is successfully reestablished;

[0151] An eighth indication is sent to the first relay terminal, where the eighth indication is used to instruct the first relay terminal to maintain the connection with the remote terminal.

[0152] In conjunction with some embodiments of the third aspect, in some embodiments, the method further includes:

[0153] Determining that the connection reestablishment of the remote terminal fails;

[0154] A ninth instruction is sent to the first relay terminal, where the ninth instruction is used to instruct the first relay terminal to send a fifth instruction to the remote terminal, where the fifth instruction is used to instruct the remote terminal to reestablish the connection.

[0155] In conjunction with some embodiments of the third aspect, in some embodiments, the method further includes:

[0156] receiving a first connection reestablishment request sent by the first relay terminal;

[0157] A fourth indication is sent to the remote terminal, where the fourth indication is used for the remote terminal to perform radio bearer transmission.

[0158] In a fourth aspect, an embodiment of the present disclosure provides a connection establishment method, the method comprising:

[0159] The first relay terminal determines that the connection fails;

[0160] The first relay terminal sends a first indication to the remote terminal, where the first indication is used by the remote terminal to determine whether to maintain a connection with the first relay terminal;

[0161] The remote terminal determines whether to maintain the connection with the first relay terminal.

[0162] In the above embodiment, when the first relay terminal determines that the connection fails, it can send a first indication to the remote terminal. The remote terminal can choose whether to maintain the connection with the first relay terminal, and thus can choose a way to reestablish the connection, thereby improving the flexibility of connection establishment.

[0163] In a fifth aspect, an embodiment of the present disclosure proposes a remote terminal, which may include at least one of a transceiver module and a processing module; wherein the remote terminal can be used to execute the optional implementation method of the first aspect.

[0164] In a sixth aspect, an embodiment of the present disclosure proposes a first relay terminal, which may include at least one of a processing module and a transceiver module; wherein the first relay terminal may be used to execute the optional implementation method of the second aspect.

[0165] In a seventh aspect, an embodiment of the present disclosure proposes a network device, which may include a transceiver module; wherein the network device can be used to execute the optional implementation method of the third aspect.

[0166] In an eighth aspect, an embodiment of the present disclosure proposes a remote terminal, which may include: one or more processors; wherein, the remote terminal can be used to execute the optional implementation method of the first aspect.

[0167] In a ninth aspect, an embodiment of the present disclosure proposes a first relay terminal, which may include: one or more processors; wherein the first relay terminal may be used to execute the optional implementation method of the second aspect.

[0168] In a tenth aspect, an embodiment of the present disclosure proposes a network device, which may include: one or more processors; wherein, the network device can be used to execute the optional implementation method of the third aspect.

[0169] In the eleventh aspect, an embodiment of the present disclosure proposes a communication system, which may include: a remote terminal, a first relay terminal and a network device; wherein, the remote terminal is configured to execute the method described in the optional implementation manner of the first aspect, the first relay terminal is configured to execute the method described in the optional implementation manner of the second aspect, and the network device is configured to execute the method described in the optional implementation manner of the third aspect.

[0170] In the twelfth aspect, an embodiment of the present disclosure proposes a storage medium storing instructions, which, when executed on a communication device, enables the communication device to execute the method described in the optional implementation of the first aspect, the second aspect, or the third aspect.

[0171] In a thirteenth aspect, an embodiment of the present disclosure proposes a program product, which, when executed by a communication device, enables the communication device to execute the method described in the optional implementation manner of the first aspect, the second aspect, or the third aspect.

[0172] In a fourteenth aspect, an embodiment of the present disclosure proposes a computer program, which, when executed on a computer, enables the computer to execute the method described in the optional implementation of the first aspect, the second aspect, or the third aspect.

[0173] In a fifteenth aspect, an embodiment of the present disclosure provides a chip or a chip system, wherein the chip or chip system includes a processing circuit configured to execute the method described in the optional implementation of the first aspect, the second aspect, or the third aspect.

[0174] It is understandable that the aforementioned remote terminal, first relay terminal, network device, communication device, communication system, storage medium, program product, computer program, chip, or chip system can all be used to perform 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.

[0175] The present disclosure provides a connection establishment method, device, and storage medium. In some embodiments, the terms "connection establishment method" and "information processing method" and "communication method" are interchangeable; "connection establishment device" and "information processing device" and "communication device" are interchangeable; and "information processing system" and "communication system" are interchangeable.

[0176] 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.

[0177] 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.

[0178] 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.

[0179] 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.

[0180] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0181] In some embodiments, the terms "a plurality of," "multiple," "at least one of," "one or more," and the like can be used interchangeably.

[0182] 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.

[0183] 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.

[0184] 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.

[0185] 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.

[0186] In some embodiments, terms such as "in response to...", "in response to determining...", "in the case of...", "at the time of...", "when...", "if...", "if...", etc. can be used interchangeably.

[0187] In some embodiments, terms such as "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not less than", and "above" can be replaced with each other, and terms such as "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "not more than", "lower than", "lower than or equal to", "not higher than", and "below" can be replaced with each other.

[0188] 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", "chip", "chip system", "entity", "subject", etc.

[0189] In some embodiments, "network" can be interpreted as devices included in the network, such as access network equipment, core network equipment, etc.

[0190] 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 (Radio Base Station)", "Fixed Station (Fixed Station)", and in some embodiments may also be understood as "Node (Node)", "Access Point (Access Point)", "Transmission Point (TP)", "Reception Point (RP)", "Transmission and / or Reception Point (TRP))", "Panel (Panel)", "Antenna Panel (Antenna Panel)", "Antenna Array (Antenna Array)" "Cell (Cell)", "Macro Cell (Macro Cell)", "Small Cell (Small Cell)", "Femto Cell (Femto Cell)", "Pico Cell (Pico Cell)" "Sector (Sector)" "Cell Group (Cell Group)" "Serving Cell" "Carrier (Carrier)", "Component Carrier (Component Carrier)" "Bandwidth Part (BWP)" and the like.

[0191] In some embodiments, "terminal" or "terminal device" can be referred to as "user equipment (UE)", "user terminal (User Terminal)", "mobile station (MS)", "mobile terminal (MT)", subscriber station (Subscriber Station), mobile unit (Mobile Unit), subscriber unit (Subscriber Unit), wireless unit (Wireless Unit), remote unit (Remote Unit), mobile device (Mobile Device), wireless device (Wireless Device), wireless communication device (Wireless Communication Device), remote device (Remote Device), mobile subscriber station (Mobile Subscriber Station), access terminal (Access Terminal), mobile terminal (Mobile Terminal), wireless terminal (Wireless Terminal), remote terminal (Remote Terminal), handset (Handset), user agent (User Agent), mobile client (Mobile Client), client (Client), etc.

[0192] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0193] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0194] 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.

[0195] FIG1A is a schematic diagram illustrating the architecture of a communication system according to an embodiment of the present disclosure. As shown in FIG1A , a communication system 100 includes a terminal device 150 and a network device 160 .

[0196] In some embodiments, the terminal device 150 includes, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication capabilities, a smart car, a tablet computer, a computer with wireless transceiver capabilities, 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.

[0197] In some embodiments, the network device 160 may include at least one of an access network device and a core network device.

[0198] In some embodiments, the access network device may be a node or device that accesses the terminal to the 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.

[0199] 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.

[0200] 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.

[0201] In some embodiments, the core network device may be a single device, or may be multiple devices or a group of devices. The core network may include at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0202] 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.

[0203] The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG1A , or a portion thereof, but are not limited thereto. The entities shown in FIG1A are illustrative only. The communication system may include all or part of the entities shown in FIG1A , or may include other entities other than those shown in FIG1A . The number and form of the entities may be 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.

[0204] 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, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X), systems utilizing other communication methods, and next-generation systems based on and extending these methods. Furthermore, multiple systems may be combined (for example, a combination of LTE or LTE-A with 5G).

[0205] In some embodiments of the present disclosure, as shown in FIG1A , a terminal device 150 may include a remote terminal 151 and a first relay terminal 153. The first relay terminal 153 may be configured to provide a relay function for communication between the remote terminal and the network device. In this scenario, the remote terminal 151 may be referred to as a remote UE, and the first relay terminal 153 providing the relay function may be referred to as a relay UE. The first relay terminal 153 and the network device 160 may communicate via a UU interface, and the remote terminal 151 and the first relay terminal 153 may communicate via a sidelink. The interface for communication between the remote terminal 151 and the first relay terminal 153 may be referred to as a PC5 interface or a sidelink communication interface. The mode of direct link communication between the remote terminal 151 and the first relay terminal 153 may include any one or more of unicast, multicast, or broadcast.

[0206] It should be noted that in Figure 1A, the above-mentioned terminal device 150 can also include a second terminal, a third terminal or more terminals; the above-mentioned remote terminal can be one or more, and the first relay terminal can also be one or more, which is not limited in this disclosure.

[0207] Figure 1B is a schematic diagram of a service data transmission according to an embodiment of the present disclosure. As shown in Figure 1B, the network device 160 can send service data through the Packet Data Convergence Protocol (PDCP) entity and the Radio Link Control (RLC) entity; the first relay terminal 153 receives the service data through the RLC entity and sends the service data through the SL-RLC entity; the remote terminal 151 can receive the service data through the Sidelink-Radio Link Control (SL-RLC) entity and the PDCP entity. In this way, without the need for a PDCP entity, the first relay terminal 153 can forward the service data through the RLC entity and the SL-RLC entity.

[0208] In some embodiments, the network device 160 may also include a media access control MAC (Medium Access Control) entity and a physical layer PHY (Physical) entity, and the remote terminal 151 may also include a direct link media access control SL-MAC entity and a direct link physical layer SL-PHY entity. Similarly, the first relay terminal 153 may also include a MAC entity, a PHY entity, an SL-MAC entity and an SL-PHY entity.

[0209] It should be noted that for relevant descriptions of PDCP, RLC, MAC and PHY, please refer to the description in the 3GPP protocol, which will not be repeated here.

[0210] In other embodiments, when a connected UE experiences a connection failure, the UE initiates an RRC connection reestablishment process. Connection failures may include radio link failures, handover failures, and the like. If the UE selects a suitable cell or relay UE, it sends an RRC reestablishment request message (RRCReestablishmentRequest) and simultaneously starts the T301 timer. If an RRC reestablishment message (RRCReestablishment) is received, the T301 timer stops. If the T301 timer expires, the RRC reestablishment has failed.

[0211] In some other embodiments, in order to support direct communication between UEs, a direct link (sidelink) communication mode is introduced, and the interface between UEs is PC-5. According to the corresponding relationship between the sending and receiving UEs, three transmission modes are supported on the sidelink: unicast, multicast and broadcast. After two UEs establish a unicast connection, one UE can send a PC5-RRC message to the other UE. A UE can communicate with the base station through the relay of another UE instead of directly connecting to the base station. The UE that is not connected to the base station is called a remote UE (remote UE), and the UE that provides relay function is called a relay UE (relay UE). The remote UE and the relay UE communicate through sidelink unicast. Even if the remote UE cannot receive the base station signal, the remote UE can maintain communication with the network through the relay UE, thereby expanding the coverage of the network.

[0212] In some other embodiments, when a relay UE experiences a connection failure, it sends a notification message (NotificationMessageSidelink) to the connected remote UE via sidelink. When the remote UE receives the notification message, the connected remote UE can trigger RRC connection reestablishment, and the relay UE can also trigger RRC connection reestablishment. In this way, both the remote UE and the relay UE will send RRC connection reestablishment request messages to the network device, resulting in relatively high signaling overhead.

[0213] FIG2 is an interactive diagram illustrating a connection establishment method according to an embodiment of the present disclosure. The method may be executed by the above-mentioned communication system. As shown in FIG2 , the method may include:

[0214] Step S201: The network device sends first configuration information to a remote terminal.

[0215] The first configuration information may indicate whether the remote terminal maintains the connection with the first relay terminal when the connection with the first relay terminal fails.

[0216] In some embodiments, the remote terminal may receive the first configuration information. For example, the remote terminal may receive the first configuration information sent by a network device. For another example, the remote terminal may receive the first configuration information sent by another entity.

[0217] In some embodiments, the name of the first configuration information is not limited, for example, it can be "instruction information for maintaining connection with the first relay terminal", "instruction information for not maintaining connection with the first relay terminal", "instruction information for releasing connection with the first relay terminal", etc.

[0218] In some embodiments, the first configuration information may be information predefined by a protocol, or the first configuration information may be information configured by a network device.

[0219] In some embodiments, the network device determines that the remote terminal maintains the connection with the first relay terminal when the connection with the first relay terminal fails, and sends the first configuration information to the remote terminal.

[0220] In some embodiments, the network device determines that the remote terminal does not maintain the connection with the first relay terminal when the connection with the first relay terminal fails, and does not send the first configuration information to the remote terminal.

[0221] In some embodiments, the first configuration information sent by the network device to the remote terminal may be a first specific value, and the first configuration information being the first specific value may be used to instruct the remote terminal to maintain connection with the first relay terminal when the connection with the first relay terminal fails.

[0222] In some embodiments, the first configuration information sent by the network device to the remote terminal may be a second specific value, and the first configuration information being the second specific value may be used to instruct the remote terminal not to maintain connection with the first relay terminal when the first relay terminal connection fails.

[0223] The first specific value and the second specific value are different. For example, the first specific value is 1 and the second specific value is 0; or the first specific value is 0 and the second specific value is 1.

[0224] In some embodiments, the network device may send the first configuration information to the remote terminal when determining to establish a connection with the remote terminal.

[0225] In other embodiments, the network device may send the first configuration information to the remote terminal at any time when the remote terminal is in a connected state.

[0226] In some embodiments, after receiving the first configuration information sent by the network device, the remote terminal may store the first configuration information.

[0227] In some embodiments, after receiving the first configuration information sent by the network device, the remote terminal can parse the first configuration information and store the parsed result of the first configuration information. The parsed result can be maintaining the connection with the first relay terminal when the first relay terminal fails to connect, or releasing the connection with the first relay terminal when the first relay terminal fails to connect.

[0228] In some embodiments, the network device may send the first configuration information to the remote terminal through a downlink channel, and the downlink channel may include at least one of a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), or other channels specified by the protocol.

[0229] In some embodiments, the network device may send a seventh indication to the first relay terminal.

[0230] In some embodiments, the seventh indication may be used to instruct the first relay terminal to maintain connection with the remote terminal.

[0231] In some embodiments, the name of the seventh indication is not limited, and may be, for example, "maintain remote connection indication", "maintain connection indication", "do not release remote connection indication", etc.

[0232] In some embodiments, the first relay terminal may receive the seventh indication. For example, the first relay terminal may receive the seventh indication sent by the network device. For another example, the first relay terminal may receive the seventh indication sent by another entity.

[0233] Step S202: The first relay terminal determines that the connection fails.

[0234] In some embodiments, the connection failure may be an RRC connection failure.

[0235] In other embodiments, the connection failure may be a wireless link failure.

[0236] In other embodiments, the connection failure may be a cell handover failure.

[0237] In other embodiments, the connection failure may be a cell reselection failure.

[0238] In some embodiments, the first relay terminal determines that the connection has failed, indicating that the first relay terminal cannot communicate with the network device.

[0239] In some embodiments, the first relay terminal determines that the connection has failed and may communicate with the remote terminal.

[0240] In some embodiments, the first relay terminal determines that the connection has failed and the remote terminal cannot send information to the network device through the first relay terminal.

[0241] In some embodiments, the first relay terminal determines that the connection has failed and the network device cannot send information to the remote terminal through the first relay terminal.

[0242] Step S203: The first relay terminal sends a first instruction to the remote terminal.

[0243] The first indication may be used by the remote terminal to determine whether to maintain the connection with the first relay terminal.

[0244] In some embodiments, the name of the first indication is not limited, and may be, for example, "connection failure indication", "failure indication", "connection indication", "connection status indication", etc.

[0245] In some embodiments, the remote terminal may receive the first indication. For example, the remote terminal may receive the first indication sent by the first relay terminal. For another example, the remote terminal may receive the first indication sent by another entity.

[0246] In some embodiments, the remote terminal includes a terminal connected to the first relay terminal.

[0247] In some embodiments, when the first relay terminal determines that the connection has failed, it may determine the remote terminal that is currently connected to the first relay terminal and send the first indication to the remote terminal that is currently connected.

[0248] In some embodiments, the remote terminal may include at least one terminal.

[0249] Step S204: The remote terminal determines whether to maintain the connection with the first relay terminal based on the first configuration information. If it is determined to maintain the connection with the first relay terminal, steps S205 to S215 are executed. If it is determined not to maintain the connection with the first relay terminal, step S216 is executed.

[0250] In some embodiments, the remote terminal receives a first indication sent by the first relay terminal.

[0251] In some embodiments, the first configuration information sent by the network device indicates to maintain the connection with the first relay terminal when the first relay terminal fails to connect. The remote terminal receives the first indication sent by the first relay terminal and determines to maintain the connection with the first relay terminal.

[0252] In some embodiments, when the first configuration information sent by the network device indicates not to maintain the connection with the first relay terminal when the first relay terminal connection fails, the remote terminal receives the first indication sent by the first relay terminal and determines not to maintain the connection with the first relay terminal.

[0253] In some embodiments, when the remote terminal does not receive the first configuration information sent by the network device, the remote terminal receives a first indication sent by the first relay terminal and determines not to maintain the connection with the first relay terminal.

[0254] In some embodiments, when the first configuration information sent by the network device is a first specific value, the remote terminal receives a first indication sent by the first relay terminal and determines to maintain the connection with the first relay terminal.

[0255] In some embodiments, when the first configuration information sent by the network device is the second specific value, the remote terminal receives the first indication sent by the first relay terminal and determines not to maintain the connection with the first relay terminal.

[0256] In some embodiments, not maintaining the connection with the first relay terminal may also be referred to as releasing the connection with the first relay terminal.

[0257] Step S205: The remote terminal sends a second instruction to the first relay terminal.

[0258] The second indication may be used to instruct the first relay terminal to maintain connection with the remote terminal.

[0259] In some embodiments, the name of the second indication is not limited, and may be, for example, a "keep connection indication", a "connection confirmation indication", a "connection indication", etc.

[0260] In some embodiments, the first relay terminal may receive the second indication. For example, the first relay terminal may receive the second indication sent by the remote terminal. For another example, the first relay terminal may receive the second indication sent by another entity.

[0261] In some embodiments, the first relay terminal is a relay terminal that maintains a connection with a remote terminal.

[0262] In some embodiments, the remote terminal determines to maintain the connection with the first relay terminal and sends the second indication to the first relay terminal.

[0263] In some embodiments, the remote terminal determines to maintain the connection with the first relay terminal and sends the second indication to the first relay terminal.

[0264] In some embodiments, the remote terminal determines not to maintain the connection with the first relay terminal and does not send the second indication to the first relay terminal.

[0265] In some embodiments, the second indication sent by the remote terminal to the first relay terminal may be a first specific value, and the second indication being the first specific value may be used to instruct the first relay terminal to maintain connection with the remote terminal.

[0266] For example, the first specific value is 1 or 0.

[0267] In some embodiments, the remote terminal determines to maintain the connection with the first relay terminal and may suspend all radio bearer transmissions.

[0268] In some embodiments, the remote terminal determines to maintain the connection with the first relay terminal and may use a default configuration of a signaling radio bearer (SRB).

[0269] In some embodiments, the remote terminal determines to maintain the connection with the first relay terminal, may suspend all radio bearer transmissions, and use the default configuration of the SRB.

[0270] In some embodiments, after the remote terminal determines to maintain the connection with the first relay terminal, it may release the stored measurement configuration and / or reset the MAC.

[0271] In some embodiments, the remote terminal determines to maintain the connection with the first relay terminal and may start a first timer.

[0272] In some embodiments, the duration of the first timer may be specified by a protocol.

[0273] In some embodiments, the duration of the first timer may be pre-configured by the network device.

[0274] Step S206: The first relay terminal maintains the connection with the remote terminal according to the second instruction.

[0275] In some embodiments, the first relay terminal may receive the second indication. For example, the first relay terminal may receive the second indication sent by the remote terminal. For another example, the first relay terminal may receive the second indication sent by another entity.

[0276] In some embodiments, the first relay terminal receives the second indication sent by the remote terminal and maintains the connection with the remote terminal.

[0277] In some embodiments, the first relay terminal receives the second indication sent by the remote terminal and does not disconnect from the remote terminal.

[0278] In some embodiments, the first relay terminal receives the second indication sent by the remote terminal and does not release the connection with the remote terminal.

[0279] In some embodiments, the first relay terminal does not receive the second indication sent by the remote terminal and does not maintain the connection with the remote terminal.

[0280] In some embodiments, the second indication received by the first relay terminal is a first specific value, and the connection with the remote terminal is maintained.

[0281] In some embodiments, the first relay terminal may maintain the connection with the remote terminal according to the seventh indication.

[0282] In some embodiments, the first relay terminal receives the seventh instruction sent by the network device and maintains the connection with the remote terminal.

[0283] In some embodiments, the first relay terminal receives the seventh indication sent by the network device, determines that the connection of the first relay terminal has failed, and maintains the connection with the remote terminal.

[0284] In some embodiments, the seventh indication may include a terminal identification of the remote terminal.

[0285] For example, the first relay terminal may determine the remote terminal according to the terminal identifier, and maintain a connection with the determined remote terminal.

[0286] Step S207: The first relay terminal sends a sixth instruction to the network device according to the second instruction through the second cell or the third relay terminal that meets the second preset channel quality condition.

[0287] The sixth indication may be used to indicate reestablishing a connection with a remote terminal.

[0288] In some embodiments, the network device may receive the sixth indication and reestablish the connection between the network device and the remote terminal.

[0289] In some embodiments, the name of the sixth indication is not limited, and may be, for example, "connection request", "connection establishment request", "connection reestablishment request", etc.

[0290] In some embodiments, the sixth indication may be carried in an RRC reestablishment request message or an RRC reestablishment complete message.

[0291] In some embodiments, the sixth indication may include a terminal identification of the remote terminal.

[0292] In some embodiments, the sixth indication may include terminal identifiers of multiple remote terminals.

[0293] For example, the sixth indication may include terminal identification A of remote terminal A and terminal identification B of remote terminal B.

[0294] For another example, the network device may determine the remote terminal according to the terminal identifier and reestablish the connection with the determined remote terminal.

[0295] In some embodiments, the second preset channel quality condition may be that the channel quality is greater than or equal to a preset quality threshold.

[0296] In some embodiments, the preset channel quality condition may include a second cell channel quality condition and a second terminal channel quality condition.

[0297] In some embodiments, the cell that meets the second cell channel quality condition is the second cell.

[0298] In some embodiments, the relay terminal that meets the second terminal channel quality condition is a third relay terminal.

[0299] In some embodiments, the second cell channel quality condition may be that the cell channel quality is greater than or equal to a second cell quality threshold.

[0300] In some embodiments, the second cell channel quality condition may be that the cell channel quality is greater than or equal to a second cell quality threshold, and the cell supports relay and direct links.

[0301] In some embodiments, the second terminal channel quality condition may be that the terminal channel quality is greater than or equal to a second terminal quality threshold.

[0302] In some embodiments, the cell channel quality may be the reference signal received power (RSRP) of the cell.

[0303] In some embodiments, the terminal signal quality may be a sidelink reference signal received power (RSRP) between the remote terminal and the first relay terminal.

[0304] In some embodiments, the network device may receive the sixth indication. For example, the network device may receive the sixth indication sent by the first relay terminal. For another example, the network device may receive the sixth indication sent by another entity.

[0305] In some embodiments, the first relay terminal determines to maintain the connection with the remote terminal based on the second indication, may determine a second cell that meets the second preset channel quality condition from multiple cells, and send the sixth indication to the network device through the second cell.

[0306] In some embodiments, the first relay terminal determines to maintain connection with the remote terminal based on the second indication, and can determine a second cell from multiple cells that meets the second preset channel quality condition and supports relay and direct links, and send the sixth indication to the network device through the second cell.

[0307] In some embodiments, the first relay terminal determines to maintain connection with the remote terminal based on the second indication, and can determine a third relay terminal that meets the second preset channel quality condition from multiple relay terminals, and send the sixth indication to the network device through the third relay terminal.

[0308] In some embodiments, the first relay terminal determines to maintain connection with the remote terminal based on the second indication, and can determine a second cell or a third relay terminal that meets the second preset channel quality condition from multiple cells and multiple relay terminals. If it is determined that the second preset channel quality condition is met by the second cell, the sixth indication is sent to the network device through the second cell; if it is determined that the second preset channel quality condition is met by the third relay terminal, the sixth indication is sent to the network device through the third relay terminal.

[0309] In some embodiments, the first relay terminal determines to maintain connection with the remote terminal based on the second indication, and can first determine whether there is a second cell that meets the second preset channel quality condition from multiple cells. If there is a second cell that meets the second preset channel quality condition, the sixth indication is sent to the network device through the second cell; if there is no second cell that meets the second preset channel quality condition, it is determined from multiple relay terminals whether there is a third relay terminal that meets the second preset channel quality condition. If there is a third relay terminal that meets the second preset channel quality condition, the sixth indication is sent to the network device through the third relay terminal; if there is no third relay terminal that meets the second preset channel quality condition, the relay terminal with the best channel quality among the multiple relay terminals is used as the third relay terminal, and the sixth indication is sent to the network device through the third relay terminal.

[0310] In other embodiments, the first relay terminal determines to maintain the connection with the remote terminal based on the second indication, and can first determine whether there is a third relay terminal that meets the second preset channel quality condition from multiple relay terminals. If there is a third relay terminal that meets the second preset channel quality condition, the sixth indication is sent to the network device through the third relay terminal; if there is no third relay terminal that meets the second preset channel quality condition, then determine whether there is a second cell that meets the second preset channel quality condition from multiple cells. If there is a second cell that meets the second preset channel quality condition, the sixth indication is sent to the network device through the second cell; if there is no second cell that meets the second preset channel quality condition, then the cell with the best channel quality among the multiple cells is used as the second cell, and the sixth indication is sent to the network device through the second cell.

[0311] In some embodiments, the first relay terminal may send a sixth indication to the network device according to the seventh indication through the second cell or the third relay terminal that meets the second preset channel quality condition.

[0312] It should be noted that the implementation method of the first relay terminal sending the sixth indication to the network device according to the seventh indication can refer to the implementation method of the first relay terminal sending the sixth indication to the network device according to the second indication, which will not be repeated here.

[0313] Step S208: The network device reestablishes the connection with the remote terminal according to the sixth instruction.

[0314] In some embodiments, the network device may receive a sixth indication sent by the first relay terminal, and reestablish the connection between the network device and the remote terminal according to the sixth indication.

[0315] It should be noted that the method for reestablishing the connection with the remote terminal can be referred to the relevant description of the 3GPP protocol, which will not be repeated here.

[0316] Step S209: The first relay terminal sends a first connection reestablishment request to the network device through the second cell or the third relay terminal that meets the second preset channel quality condition.

[0317] In some embodiments, the first connection reestablishment request is used to instruct the network device to reestablish the connection with the first relay terminal.

[0318] In some embodiments, the name of the first connection reestablishment request is not limited, for example, it can be "RRC connection reestablishment request", "RRC connection request", "connection request", etc.

[0319] In some embodiments, the network device may receive a first connection reestablishment request. For example, the network device may receive a first connection reestablishment request sent by a first relay terminal. For another example, the network device may receive a first connection reestablishment request sent by another entity.

[0320] In some embodiments, the first relay terminal determines that the connection fails, determines a second cell or a third relay terminal that meets a second preset channel quality condition, and sends the first connection reestablishment request to the network device through the second cell or the third relay terminal.

[0321] The method for determining the second cell or the third relay terminal that meets the second preset channel quality condition in step S209 can be referred to the optional implementation of step S208 and will not be repeated here.

[0322] In some embodiments, the first relay terminal sends a first connection reestablishment request to the network device and starts a second timer.

[0323] In some embodiments, the duration of the second timer may be specified by a protocol.

[0324] In some embodiments, the duration of the second timer may be pre-configured by the network device.

[0325] Step S210: The network device sends a fourth instruction to the remote terminal.

[0326] The fourth indication may be used by the remote terminal to perform wireless bearer transmission.

[0327] In some embodiments, the name of the fourth indication is not limited, and may be, for example, a "radio bearer transmission indication", a "reestablishment request confirmation indication", a "reestablishment confirmation indication", etc.

[0328] In some embodiments, the fourth indication may include second configuration information.

[0329] In some embodiments, the second configuration information may be information predefined by a protocol, or the second configuration information may be information configured by a network device.

[0330] In some embodiments, the remote terminal may receive the fourth indication. For example, the remote terminal may receive the fourth indication sent by the network device. For another example, the remote terminal may receive the fourth indication sent by another entity.

[0331] In some embodiments, the network device may receive a first connection reestablishment request sent by the first relay terminal, and send the fourth indication to the remote terminal.

[0332] In some embodiments, the network device may receive a first connection reestablishment request sent by the first relay terminal, and determine that the connection reestablishment of the first relay terminal is successful, and send the fourth indication to the remote terminal.

[0333] In some embodiments, the network device may receive a first connection reestablishment request sent by the first relay terminal, determine that the connection reestablishment of the first relay terminal is successful, and send the fourth indication to the remote terminal through the first relay terminal.

[0334] Step S211: The remote terminal performs radio bearer transmission according to the fourth instruction.

[0335] In some embodiments, radio bearer (RB) transmission may be a channel for data transmission, for example, the radio bearer transmission may include PDCP and RLC.

[0336] In some embodiments, the remote terminal may receive a fourth indication sent by the network device, and perform radio bearer transmission according to the fourth indication.

[0337] In some embodiments, the remote terminal may receive a fourth indication sent by the network device, and resume the suspended radio bearer transmission according to the fourth indication.

[0338] In some embodiments, the remote terminal may receive a fourth indication sent by the network device, and perform radio bearer transmission according to the second configuration information in the fourth indication.

[0339] For example, the remote terminal may receive the fourth instruction sent by the network device, update the key, and resume all radio bearer transmissions.

[0340] Step S212: The network device reestablishes the connection with the first relay terminal according to the first connection reestablishment request.

[0341] In some embodiments, the network device may receive a first connection reestablishment request sent by the first relay terminal, and reestablish the connection between the network device and the first relay terminal according to the first connection reestablishment request.

[0342] It should be noted that, for the method of reestablishing the connection of the first relay terminal, reference may be made to the relevant description of the 3GPP protocol, which will not be described in detail here.

[0343] Step S213: The network device determines that the connection with the first relay terminal and the remote terminal is successfully reestablished, and sends an eighth indication to the first relay terminal.

[0344] The eighth indication may be used to instruct the first relay terminal to maintain connection with the remote terminal.

[0345] In some embodiments, the first relay terminal may receive the eighth indication. For example, the first relay terminal may receive the eighth indication sent by the network device. For another example, the first relay terminal may receive the eighth indication sent by another entity.

[0346] In some embodiments, the name of the eighth indication is not limited, and may be, for example, "reconstruction completion message", "connection reconstructing success indication", "connection success indication", etc.

[0347] In some embodiments, the eighth indication may include a terminal identification of the remote terminal.

[0348] In some embodiments, the eighth indication may be carried in an RRC reconstruction message or an RRC reconfiguration message.

[0349] In some embodiments, the network device determines that the connection with the first relay terminal is successfully reestablished, and determines that the connection with the remote terminal is successfully reestablished, and sends the eighth indication to the first relay terminal.

[0350] In some embodiments, the network device may not send the eighth indication to the first relay terminal if it determines that the connection with the first relay terminal is successfully reestablished and determines that the connection with the remote terminal is failed to be reestablished.

[0351] In some embodiments, if the network device determines that the connection with the first relay terminal fails to be reestablished and that the connection with the remote terminal fails to be reestablished, the eighth indication may not be sent to the first relay terminal.

[0352] In some embodiments, the network device determines that the connection reestablishment of the remote terminal has failed, and sends a ninth indication to the first relay terminal.

[0353] In some embodiments, the ninth indication may be used to instruct the first relay terminal to send a fifth indication to the remote terminal, and the fifth indication may be used to instruct the remote terminal to reestablish the connection.

[0354] In some embodiments, the name of the ninth indication is not limited, and may be, for example, a "connection failure indication", a "connection reestablishment failure indication", a "release connection indication", etc.

[0355] In some embodiments, the ninth indication may carry a terminal identifier of the remote terminal.

[0356] In some embodiments, the ninth indication may include a terminal identifier of the remote terminal with which the connection is successfully reestablished.

[0357] For example, taking the above-mentioned sixth indication which may include the terminal identification A of the remote terminal A and the terminal identification B of the remote terminal B as an example, if the network device determines that the connection reconstruction of the remote terminal A fails, then the ninth indication may include the terminal identification A; if the network device determines that the connection reconstruction of the remote terminal B fails, then the ninth indication may include the terminal identification B.

[0358] In some embodiments, the first relay terminal may send the fifth indication to the remote terminal where the connection reestablishment fails.

[0359] For example, if the ninth indication includes terminal identification A, the first relay terminal may send the fifth indication to remote terminal A; if the ninth indication includes terminal identification B, the first relay terminal may send the fifth indication to remote terminal B.

[0360] In some embodiments, the first relay terminal may release the connection with the remote terminal indicated by the ninth indication.

[0361] For example, if the ninth indication includes terminal identification A, the first relay terminal may release the connection with the remote terminal A; if the ninth indication includes terminal identification B, the first relay terminal may release the connection with the remote terminal B.

[0362] Step S214: The first relay terminal maintains the connection with the remote terminal according to the eighth instruction.

[0363] In some embodiments, the first relay terminal may receive an eighth instruction sent by the network device and maintain the connection with the remote terminal.

[0364] In some embodiments, the first relay terminal may receive the eighth instruction sent by the network device without disconnecting from the remote terminal.

[0365] In some embodiments, the first relay terminal may receive the eighth instruction sent by the network device and not release the connection with the remote terminal.

[0366] In some embodiments, the first relay terminal may receive the eighth indication sent by the network device, and send the tenth indication to the remote terminal.

[0367] The tenth indication is used to instruct the remote terminal to maintain connection with the first relay terminal.

[0368] In some embodiments, the name of the tenth indication is not limited, and may be, for example, "instruction information for maintaining connection with the first relay terminal", "maintain connection indication", etc.

[0369] In some embodiments, the remote terminal may receive the tenth instruction sent by the first relay terminal and maintain the connection with the first relay terminal.

[0370] Step S215: The first relay terminal determines that the connection is reestablished successfully, and sends a third indication to the remote terminal.

[0371] In some embodiments, the name of the third indication is not limited, and may be, for example, a "connection success indication", a "connection completion indication", a "connection reestablishment completion indication", etc.

[0372] In some embodiments, the remote terminal may receive the third indication. For example, the remote terminal may receive the third indication sent by the first relay terminal. For another example, the remote terminal may receive the third indication sent by another entity.

[0373] In some embodiments, the first relay terminal determines that the connection reestablishment is successful and sends the third indication to the remote terminal.

[0374] In some embodiments, the first relay terminal may receive a reestablishment completion message sent by the network device, and send the third indication to the remote terminal.

[0375] In some embodiments, the remote terminal may receive the third indication and determine that information can be sent to the network device through the first relay terminal.

[0376] In some embodiments, the remote terminal may receive the third indication and determine that it can receive information sent by the network device through the first relay terminal.

[0377] In some embodiments, the first relay terminal determines that the connection reestablishment fails and sends a fifth indication to the remote terminal.

[0378] In some embodiments, the fifth indication may be used to instruct the remote terminal to reestablish the connection.

[0379] In some embodiments, the name of the fifth indication is not limited, and may be, for example, a "connection failure indication", a "connection reestablishment failure indication", a "release connection indication", etc.

[0380] In some embodiments, the remote terminal may receive the fifth indication. For example, the remote terminal may receive the fifth indication sent by the first relay terminal. For another example, the remote terminal may receive the fifth indication sent by another entity.

[0381] In some embodiments, the first relay terminal determines that the connection reestablishment fails, including at least one of the following: determining that the second cell does not support relay operation; determining that the second cell does not support a direct link; determining that the second cell does not meet the second preset channel quality condition; determining that the third relay terminal does not meet the second preset channel quality condition; determining that the second timer has timed out; receiving a ninth indication sent by the network device.

[0382] In some embodiments, the second timer is started when the first connection reestablishment request is sent to the network device.

[0383] In some embodiments, the first relay terminal determines the second cell and sends a first connection reestablishment request to the second cell. If it is determined that the second cell does not support relay operation, it is determined that the connection reestablishment of the first relay terminal has failed.

[0384] In some embodiments, the first relay terminal determines the second cell and sends a first connection reestablishment request to the second cell. If it is determined that the second cell does not support a direct link, it is determined that the connection reestablishment of the first relay terminal has failed.

[0385] In some embodiments, after the first relay terminal sends a first connection reestablishment request to the network device through the second cell, if it is determined that the second cell does not meet the second preset channel quality condition, it is determined that the connection reestablishment of the first relay terminal has failed.

[0386] In some embodiments, after the first relay terminal sends a first connection reestablishment request to the network device through the third relay terminal, if it is determined that the third relay terminal does not meet the second preset channel quality condition, it is determined that the connection reestablishment of the first relay terminal has failed.

[0387] In some embodiments, the fifth indication may include failure information when the first relay terminal determines that the connection reestablishment fails.

[0388] In some embodiments, the failure information may be that the second cell does not support relay operation.

[0389] In some embodiments, the failure information may be that the second cell does not support the direct link.

[0390] In some embodiments, the failure information may be that the second cell does not meet the second preset channel quality condition.

[0391] In some embodiments, the failure information may be that the third relay terminal does not meet the second preset channel quality condition.

[0392] In some embodiments, the failure information may be a second timer expiration.

[0393] In some embodiments, the failure information may be a failure to reestablish the connection with the remote terminal.

[0394] In some embodiments, the remote terminal receives the fifth indication and determines that the connection reestablishment of the first relay terminal has failed.

[0395] In some embodiments, the remote terminal determines that the first timer has timed out and determines that the connection reestablishment of the first relay terminal has failed.

[0396] In some embodiments, the first timer is started when it is determined to maintain the connection with the first relay terminal.

[0397] In some embodiments, the remote terminal receives the fifth indication and determines that the first timer has timed out, and determines that the first relay terminal connection reestablishment has failed.

[0398] In some embodiments, the remote terminal determines that the connection reestablishment of the first relay terminal has failed, and sends a second connection reestablishment request to the network device through the first cell or the second relay terminal that meets the first preset channel quality condition.

[0399] In some embodiments, the first preset channel quality condition may be that the channel quality is greater than or equal to a first preset quality threshold.

[0400] In some embodiments, the first preset channel quality condition may include a first cell channel quality condition and a first terminal channel quality condition.

[0401] In some embodiments, the cell that meets the first cell channel quality condition is the first cell.

[0402] In some embodiments, the relay terminal that meets the first terminal channel quality condition is the second relay terminal.

[0403] In some embodiments, the first cell channel quality condition may be that the cell channel quality is greater than or equal to a first cell quality threshold.

[0404] In some embodiments, the first cell channel quality condition may be that the cell channel quality is greater than or equal to a first cell quality threshold, and the cell supports relay and direct links.

[0405] In some embodiments, the first terminal channel quality condition may be that the terminal channel quality is greater than or equal to a first terminal quality threshold.

[0406] In some embodiments, the cell channel quality may be the RSRP of the cell.

[0407] In some embodiments, the terminal signal quality may be RSRP of a direct link between the remote terminal and the first relay terminal.

[0408] In some embodiments, the remote terminal determines that the connection reestablishment of the first relay terminal fails, and can determine a first cell that meets the first preset channel quality condition from multiple cells, and send the second connection reestablishment request to the network device through the first cell.

[0409] In some embodiments, the remote terminal determines that the connection reestablishment of the first relay terminal has failed, and can determine the first cell that meets the first preset channel quality condition and supports relay and direct links from multiple cells, and send the second connection reestablishment request to the network device through the first cell.

[0410] In some embodiments, the remote terminal determines that the connection reestablishment of the first relay terminal fails, and can determine a second relay terminal that meets the first preset channel quality condition from multiple relay terminals, and send the second connection reestablishment request to the network device through the second relay terminal.

[0411] In some embodiments, the remote terminal determines that the connection reconstruction of the first relay terminal has failed, and can determine the first cell or the second relay terminal that meets the first preset channel quality condition from multiple cells and multiple relay terminals. If it is determined that the first preset channel quality condition is met by the first cell, the second connection reconstruction request is sent to the network device through the first cell; if it is determined that the first preset channel quality condition is met by the second relay terminal, the second connection reconstruction request is sent to the network device through the second relay terminal.

[0412] In some embodiments, when the remote terminal determines that the connection reconstruction of the first relay terminal has failed, it can first determine from multiple cells whether there is a first cell that meets the first preset channel quality condition. If there is a first cell that meets the first preset channel quality condition, the second connection reconstruction request is sent to the network device through the first cell; if there is no first cell that meets the first preset channel quality condition, it is determined from multiple relay terminals whether there is a second relay terminal that meets the first preset channel quality condition. If there is a second relay terminal that meets the first preset channel quality condition, the second connection reconstruction request is sent to the network device through the second relay terminal; if there is no second relay terminal that meets the first preset channel quality condition, the relay terminal with the best channel quality among the multiple relay terminals is used as the second relay terminal, and the second connection reconstruction request is sent to the network device through the second relay terminal.

[0413] In other embodiments, when the remote terminal determines that the connection reconstruction of the first relay terminal has failed, it can first determine from multiple relay terminals whether there is a second relay terminal that meets the first preset channel quality condition. If there is a second relay terminal that meets the first preset channel quality condition, the second connection reconstruction request is sent to the network device through the second relay terminal; if there is no second relay terminal that meets the first preset channel quality condition, it is determined from multiple cells whether there is a first cell that meets the first preset channel quality condition. If there is a first cell that meets the first preset channel quality condition, the second connection reconstruction request is sent to the network device through the first cell; if there is no first cell that meets the first preset channel quality condition, the cell with the best channel quality among the multiple cells is used as the first cell, and the second connection reconstruction request is sent to the network device through the first cell.

[0414] S216. The remote terminal sends a second connection reestablishment request to the network device through the first cell or the second relay terminal that meets the first preset channel quality condition.

[0415] In some embodiments, the second connection reestablishment request is used to instruct the network device to reestablish a connection with the remote terminal.

[0416] It should be noted that the implementation method of sending the second connection reestablishment request to the network device in step S216 can refer to the implementation method of sending the first connection reestablishment request to the network device when determining that the connection reestablishment of the first relay terminal fails in the above step S215, and will not be repeated here.

[0417] Using the above method, when the first relay terminal determines that the connection has failed, the remote terminal can choose to maintain the connection with the first relay terminal or release the connection with the first relay terminal. When the remote terminal maintains the connection with the first relay terminal, it can re-establish the connection together with the first relay terminal, thereby saving signaling overhead. When the remote terminal releases the connection with the first relay terminal, the connection with the remote terminal can be re-established, thereby improving the flexibility of connection establishment.

[0418] 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.

[0419] In some embodiments, terms such as "physical downlink shared channel (PDSCH)" and "DL data" may be used interchangeably, and terms such as "physical uplink shared channel (PUSCH)" and "UL data" may be used interchangeably.

[0420] In some embodiments, terms such as "moment", "time point", "time", and "time position" can be replaced with each other, and terms such as "duration", "period", "time window", "window", and "time" can be replaced with each other.

[0421] 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.

[0422] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0423] In some embodiments, terms such as "certain", "preset", "preset", "setting", "indicated", "a certain", "any", and "first" 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.

[0424] In some embodiments, the determination or judgment can be performed by a value represented by 1 bit (0 or 1), or by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a predetermined value), but is not limited thereto.

[0425] The method according to the embodiments of the present disclosure may include at least one of steps S201 to S216. For example, step S201 may be implemented as an independent embodiment, steps S202+S203 may be implemented as independent embodiments, steps S205+S206 may be implemented as independent embodiments, steps S202+S203+S204+S205 may be implemented as independent embodiments, and steps S202+S203+S204+S215 may be implemented as independent embodiments, but the present invention is not limited thereto.

[0426] In some embodiments, the above steps S201 to S215 can be executed in a swapped order or simultaneously.

[0427] In some embodiments, steps S201 to S216 are all optional steps. For example, steps S201, S204, S209, S210, and S216 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0428] It should be noted that FIG2 shows all the steps for maintaining connection with the first relay terminal and not maintaining connection with the first relay terminal (steps S201 to S216). Not all of them are executed when the embodiment is executed, and some of the steps may be selected according to actual circumstances.

[0429] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 2 .

[0430] FIG3A is a flow chart of a connection establishment method according to an embodiment of the present disclosure. As shown in FIG3A , the embodiment of the present disclosure relates to a connection establishment method, which can be executed by a remote terminal, and the method includes:

[0431] Step S3101: Obtain first configuration information.

[0432] The optional implementation of step S3101 can refer to the optional implementation of step S201 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0433] In some embodiments, the remote terminal may receive the first configuration information sent by the network device, but is not limited thereto. The remote terminal may also receive the first configuration information sent by other entities.

[0434] In some embodiments, the remote terminal may obtain first configuration information specified by the protocol.

[0435] In some embodiments, the remote terminal may perform processing to obtain the first configuration information.

[0436] In some embodiments, step S3101 may be omitted, and the remote terminal may autonomously implement the function indicated by the first configuration information, or the above function may be default or acquiescent.

[0437] Step S3102: Obtain a first indication.

[0438] The optional implementation of step S3102 can refer to the optional implementation of step S203 in FIG2 and other related parts in the embodiment involved in FIG2 , which will not be described in detail here.

[0439] In some embodiments, the remote terminal may receive a first indication sent by the first relay terminal when the first relay terminal determines that the connection fails.

[0440] In some embodiments, the remote terminal may perform processing to obtain the first indication.

[0441] In some embodiments, step S3102 may be omitted, and the remote terminal may autonomously implement the function indicated by the first indication, or the above function may be default or acquiescent.

[0442] Step S3103: Determine whether to maintain the connection with the first relay terminal based on the first configuration information. If it is determined to maintain the connection with the first relay terminal, execute steps S3104 to S3107; if it is determined not to maintain the connection with the first relay terminal, execute step S3108.

[0443] The optional implementation of step S3103 can refer to the optional implementation of step S204 in FIG2 and other related parts in the embodiment involved in FIG2 , which will not be described in detail here.

[0444] Step S3104: Send a second instruction to the first relay terminal.

[0445] The optional implementation of step S3104 can refer to the optional implementation of step S205 in FIG2 and other related parts in the embodiment involved in FIG2 , which will not be described in detail here.

[0446] In some embodiments, the remote terminal may send the second indication to the first relay terminal, but is not limited thereto. The remote terminal may also send the second indication to other entities.

[0447] Optionally, the second indication may be used to enable the first relay terminal to maintain a connection with the remote terminal. For example, the first relay terminal may receive the second indication and maintain a connection with the remote terminal based on the second indication. For optional implementations, see the optional implementations of steps S206 to S208 in FIG. 2 and other related portions of the embodiment involved in FIG. These will not be described in detail here.

[0448] Step S3105: Obtain a fourth indication.

[0449] The optional implementation of step S3105 can refer to the optional implementation of step S210 in FIG2 and other related parts in the embodiment involved in FIG2 , which will not be described in detail here.

[0450] In some embodiments, after the network device receives the first connection reestablishment request sent by the first relay terminal, the remote terminal may receive a fourth indication sent by the network device.

[0451] In some embodiments, the remote terminal may perform processing to obtain the fourth indication.

[0452] In some embodiments, step S3105 may be omitted, and the remote terminal may autonomously implement the function indicated by the fourth indication, or the above function may be default or acquiescent.

[0453] Step S3106: Perform radio bearer transmission according to the fourth instruction.

[0454] The optional implementation of step S3106 can refer to the optional implementation of step S211 in FIG2 and other related parts in the embodiment involved in FIG2 , which will not be described in detail here.

[0455] Step S3107: Obtain a third indication.

[0456] The optional implementation of step S3107 can refer to the optional implementation of step S215 in FIG2 and other related parts in the embodiment involved in FIG2 , which will not be described in detail here.

[0457] In some embodiments, after the first relay terminal determines that the connection is successfully reestablished, the remote terminal may receive a third indication sent by the first relay terminal.

[0458] In some embodiments, the remote terminal may perform processing to obtain the third indication.

[0459] In some embodiments, step S3107 may be omitted, and the remote terminal may autonomously implement the function indicated by the third indication, or the above function may be default or acquiescent.

[0460] Step S3108: Send a second connection reestablishment request to the network device.

[0461] The optional implementation of step S3108 can refer to the optional implementation of step S216 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0462] In some embodiments, the remote terminal may send the second connection reestablishment request to the network device, but is not limited thereto. The remote terminal may also send the second connection reestablishment request to other entities.

[0463] Optionally, the second connection reestablishment request may be used by the network device to reestablish the connection. For example, the network device may receive the second connection reestablishment request and reestablish the connection with the remote terminal according to the second connection reestablishment request.

[0464] The method according to the embodiments of the present disclosure may include at least one of steps S3101 to S3108. For example, step S3101 may be implemented as an independent embodiment, step S3108 may be implemented as an independent embodiment, steps S3102 + S3103 may be implemented as an independent embodiment, steps S3105 + S3106 may be implemented as an independent embodiment, steps S3102 + S3103 + S3104 may be implemented as an independent embodiment, and steps S3102 + S3103 + S3104 + S3105 may be implemented as an independent embodiment, but the present invention is not limited thereto.

[0465] In some embodiments, the above steps S3101 to S3108 can be executed in a swapped order or simultaneously. For example, steps S3101 and S3102 can be executed in a swapped order or simultaneously.

[0466] In some embodiments, steps S3101 to S3108 are all optional steps. For example, steps S3101, S3105, S3106, and S3108 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0467] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 3A .

[0468] FIG3B is a flow chart of a connection establishment method according to an embodiment of the present disclosure. As shown in FIG3B , the embodiment of the present disclosure relates to a connection establishment method, which can be executed by a remote terminal, and the method includes:

[0469] Step S3201: Obtain a first indication.

[0470] The optional implementation of step S3201 can refer to the optional implementation of step S203 in Figure 2, the optional implementation of step S3102 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0471] Step S3202: Determine to maintain the connection with the first relay terminal.

[0472] The optional implementation of step S3202 can refer to the optional implementation of step S204 in Figure 2, the optional implementation of step S3103 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0473] Step S3203: Send a second instruction to the first relay terminal.

[0474] The optional implementation of step S3203 can refer to the optional implementation of step S205 in Figure 2, the optional implementation of step S3104 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0475] Step S3204: Obtain a fourth indication.

[0476] The optional implementation of step S3204 can refer to the optional implementation of step S210 in Figure 2, the optional implementation of step S3105 in Figure 3A and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0477] Step S3205: Perform radio bearer transmission according to the fourth instruction.

[0478] The optional implementation of step S3205 can refer to the optional implementation of step S211 in Figure 2, the optional implementation of step S3106 in Figure 3A and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0479] In some embodiments, the above steps are all optional steps.

[0480] In some embodiments, the embodiment shown in FIG. 3B may also be combined with step S3101 in the embodiment shown in FIG. 3A as a new embodiment.

[0481] In some embodiments, the embodiment shown in FIG. 3B may also be combined with step S3103 in the embodiment shown in FIG. 3A as a new embodiment.

[0482] In some embodiments, the embodiment shown in FIG. 3B may also be combined with step S3107 in the embodiment shown in FIG. 3A as a new embodiment.

[0483] In some embodiments, the embodiment shown in FIG. 3B may also be combined with step S3108 in the embodiment shown in FIG. 3A as a new embodiment.

[0484] In some embodiments, the embodiment shown in FIG. 3B may also be combined with step S3101 and step S3103 in the embodiment shown in FIG. 3A as a new embodiment.

[0485] FIG3C is a flow chart of a connection establishment method according to an embodiment of the present disclosure. As shown in FIG3C , the embodiment of the present disclosure relates to a connection establishment method, which can be executed by a remote terminal, and the method includes:

[0486] Step S3301: Obtain a first indication.

[0487] The optional implementation of step S3301 can refer to the optional implementation of step S203 in Figure 2, the optional implementation of step S3102 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0488] Step S3302: Determine to maintain the connection with the first relay terminal.

[0489] The optional implementation of step S3302 can refer to the optional implementation of step S204 in Figure 2, the optional implementation of step S3103 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0490] Step S3303: Send a second instruction to the first relay terminal.

[0491] The optional implementation of step S3303 can refer to the optional implementation of step S205 in Figure 2, the optional implementation of step S3104 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0492] In some embodiments, the above steps are all optional steps.

[0493] In some embodiments, the embodiment shown in FIG. 3C may also be combined with step S3101 in the embodiment shown in FIG. 3A as a new embodiment.

[0494] In some embodiments, the embodiment shown in FIG. 3C may also be combined with step S3103 in the embodiment shown in FIG. 3A as a new embodiment.

[0495] In some embodiments, the embodiment shown in FIG. 3C may also be combined with step S3107 in the embodiment shown in FIG. 3A as a new embodiment.

[0496] In some embodiments, the embodiment shown in FIG. 3C may also be combined with step S3108 in the embodiment shown in FIG. 3A as a new embodiment.

[0497] In some embodiments, the embodiment shown in FIG. 3C may also be combined with step S3101 and step S3103 in the embodiment shown in FIG. 3A to form a new embodiment.

[0498] In some embodiments, the embodiment shown in FIG. 3C may also be combined with step S3105 and step S3106 in the embodiment shown in FIG. 3A to form a new embodiment.

[0499] In some embodiments, the embodiment shown in FIG. 3C may also be combined with step S3101 , step S3105 , and step S3106 in the embodiment shown in FIG. 3A as a new embodiment.

[0500] FIG3D is a flow chart of a connection establishment method according to an embodiment of the present disclosure. As shown in FIG3D , the embodiment of the present disclosure relates to a connection establishment method, which can be executed by a remote terminal, and the method includes:

[0501] Step S3401: Obtain a first indication.

[0502] The optional implementation of step S3401 can refer to the optional implementation of step S203 in Figure 2, the optional implementation of step S3102 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0503] Step S3402: Determine whether to maintain the connection with the first relay terminal.

[0504] The optional implementation of step S3402 can refer to the optional implementation of step S204 in Figure 2, the optional implementation of step S3103 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0505] In some embodiments, the embodiment shown in FIG3D may also be combined with at least one of step S3101, step S3104, step S3105, step S3106, step S3107, and step S3108 in the embodiment shown in FIG3A as a new embodiment.

[0506] In some embodiments, the first indication is an indication sent by the first relay terminal when it determines that the connection has failed.

[0507] In some embodiments, the determining whether to maintain the connection with the first relay terminal includes:

[0508] Determine to maintain the connection with the first relay terminal.

[0509] In some embodiments, the method further comprises:

[0510] The second indication is sent to the first relay terminal, where the second indication is used to instruct the first relay terminal to maintain the connection with the remote terminal.

[0511] In some embodiments, the method further comprises:

[0512] A third indication is received, where the third indication is an indication sent by the first relay terminal when determining that the connection reestablishment is successful.

[0513] In some embodiments, the method further comprises:

[0514] receiving a fourth indication, where the fourth indication is an indication sent by the network device after receiving the second connection reestablishment request sent by the first relay terminal;

[0515] Perform radio bearer transmission according to the fourth instruction.

[0516] In some embodiments, the method further comprises:

[0517] determining that the connection reestablishment of the first relay terminal fails;

[0518] A second connection reestablishment request is sent to the network device through the first cell or the second relay terminal that meets the first preset channel quality condition.

[0519] In some embodiments, determining that the connection reestablishment of the first relay terminal fails includes at least one of the following:

[0520] receiving a fifth indication, where the fifth indication is an indication sent by the first relay terminal when determining that the connection reestablishment fails;

[0521] It is determined that a first timer has timed out, where the first timer is started when it is determined to maintain the connection with the first relay terminal.

[0522] In some embodiments, the determining whether to maintain the connection with the first relay terminal includes:

[0523] determining not to maintain the connection with the first relay terminal;

[0524] The method further comprises:

[0525] A second connection reestablishment request is sent to the network device through the first cell or the second relay terminal that meets the first preset channel quality condition.

[0526] In some embodiments, the method further comprises:

[0527] receiving first configuration information sent by a network device, where the first configuration information indicates whether the remote terminal maintains a connection with the first relay terminal when the connection with the first relay terminal fails;

[0528] The determining whether to maintain the connection with the first relay terminal includes:

[0529] Determine whether to maintain the connection with the first relay terminal according to the first configuration information.

[0530] FIG4A is a flow chart of a connection establishment method according to an embodiment of the present disclosure. As shown in FIG4A , the embodiment of the present disclosure relates to a connection establishment method, which can be executed by a first relay terminal, and the method includes:

[0531] Step S4101: Determine whether the connection has failed.

[0532] The optional implementation of step S4101 can refer to the optional implementation of step S202 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0533] Step S4102: Send a first instruction to the remote terminal.

[0534] The optional implementation of step S4102 can refer to the optional implementation of step S203 in FIG2 and other related parts in the embodiment involved in FIG2 , which will not be described in detail here.

[0535] In some embodiments, the first relay terminal may send the first indication to the remote terminal, but is not limited thereto. The first relay terminal may also send the first indication to other entities.

[0536] Optionally, the first indication may be used by the first relay terminal to determine whether to maintain the connection with the remote terminal. For example, the remote terminal may receive the first indication and determine to maintain the connection with the first relay terminal according to the first indication.

[0537] Step S4103: Obtain a second indication.

[0538] The optional implementation of step S4103 can refer to the optional implementation of step S205 in FIG2 and other related parts in the embodiment involved in FIG2 , which will not be described in detail here.

[0539] In some embodiments, the first relay terminal may receive the second indication sent by the remote terminal, but is not limited thereto. The first relay terminal may also receive the second indication sent by other entities.

[0540] Optionally, the second indication may be used for the first relay terminal to maintain the connection with the remote terminal. For example, the first relay terminal may receive the second indication and maintain the connection with the remote terminal according to the second indication.

[0541] Step S4104: Maintain connection with the remote terminal according to the second instruction.

[0542] The optional implementation of step S4104 can refer to the optional implementation of step S206 in FIG2 and other related parts in the embodiment involved in FIG2 , which will not be described in detail here.

[0543] Step S4105: Send a sixth instruction to the network device.

[0544] The optional implementation of step S4105 can refer to the optional implementation of step S203 in FIG2 and other related parts in the embodiment involved in FIG2 , which will not be described in detail here.

[0545] In some embodiments, the first relay terminal may send the sixth indication to the network device, but is not limited thereto. The network device may also send the sixth indication to other entities.

[0546] Optionally, the sixth indication may be used by the network device to reestablish a connection with the remote terminal. For example, the network device may receive the sixth indication and reestablish a connection with the remote terminal. For optional implementations thereof, see the optional implementations of step S208 in FIG. 2 and other related portions of the embodiment involved in FIG. 2 , which will not be described in detail here.

[0547] Step S4106: Send a first connection reestablishment request to the network device.

[0548] The optional implementation of step S4106 can refer to the optional implementation of step S209 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0549] In some embodiments, the first relay terminal may send the first connection reestablishment request to the network device, but is not limited thereto. The first relay terminal may also send the first connection reestablishment request to other entities.

[0550] Optionally, the first connection reestablishment request may be used by the network device to reestablish the connection with the first relay terminal. For example, the network device may receive the first connection reestablishment request and reestablish the connection with the first relay terminal. For optional implementations thereof, see the optional implementations of step S212 in FIG. 2 and other related portions of the embodiment involved in FIG. 2 , which will not be described in detail here.

[0551] Step S4107: Obtain the eighth instruction.

[0552] The optional implementation of step S4107 can refer to the optional implementation of step S213 in FIG2 and other related parts in the embodiment involved in FIG2 , which will not be described in detail here.

[0553] In some embodiments, the first relay terminal may receive the eighth indication sent by the network device, but is not limited thereto. The first relay terminal may also receive the eighth indication sent by other entities.

[0554] Optionally, the eighth indication may be used for the first relay terminal to maintain the connection with the remote terminal. For example, the first relay terminal may receive the eighth indication and maintain the connection with the remote terminal according to the eighth indication.

[0555] Step S4108: Maintain connection with the remote terminal according to the eighth instruction.

[0556] The optional implementation of step S4108 can refer to the optional implementation of step S214 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0557] Step S4109: Send a third instruction to the remote terminal.

[0558] The optional implementation of step S4109 can refer to the optional implementation of step S215 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0559] In some embodiments, the first relay terminal may send the third indication to the remote terminal, but is not limited thereto. The first relay terminal may also send the third indication to other entities.

[0560] The method involved in the embodiments of the present disclosure may include at least one of the above steps S4101 to S4109. For example, step S4102 can be implemented as an independent embodiment, step S4103 can be implemented as an independent embodiment, steps S4101+S4102 can be implemented as an independent embodiment, steps S4103+S4104 can be implemented as an independent embodiment, steps S4101+S4106+ can be implemented as an independent embodiment, steps S4103+S4104+S4105 can be implemented as an independent embodiment, and steps S4106+S4107+S4108+S4109 can be implemented as independent embodiments, but the present invention is not limited thereto.

[0561] In some embodiments, the above steps S4101 to S4109 can be executed in a swapped order or simultaneously. For example, steps S4102 and S4106 can be executed in a swapped order or simultaneously.

[0562] In some embodiments, steps S4101 to S4109 are all optional steps. For example, steps S4102, S4103, and S4107 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0563] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 4A .

[0564] FIG4B is a flow chart of a connection establishment method according to an embodiment of the present disclosure. As shown in FIG4B , the embodiment of the present disclosure relates to a connection establishment method, which can be executed by a first relay terminal, and the method includes:

[0565] Step S4201: Determine whether the connection has failed.

[0566] The optional implementation of step S4201 can refer to the optional implementation of step S202 in Figure 2, the optional implementation of step S4101 in Figure 4A, and other related parts in the embodiments involved in Figures 2 and 4A, which will not be repeated here.

[0567] Step S4202: Send a first instruction to the remote terminal.

[0568] The optional implementation of step S4202 can refer to the optional implementation of step S203 in Figure 2, the optional implementation of step S4102 in Figure 4A, and other related parts in the embodiments involved in Figures 2 and 4A, which will not be repeated here.

[0569] Step S4203: Obtain a second indication.

[0570] The optional implementation of step S4203 can refer to the optional implementation of step S205 in Figure 2, the optional implementation of step S4103 in Figure 4A, and other related parts in the embodiments involved in Figures 2 and 4A, which will not be repeated here.

[0571] Step S4204: Maintain connection with the remote terminal according to the second instruction.

[0572] The optional implementation of step S4204 can refer to the optional implementation of step S206 in Figure 2, the optional implementation of step S4104 in Figure 4A, and other related parts in the embodiments involved in Figures 2 and 4A, which will not be repeated here.

[0573] Step S4205: Send a sixth instruction to the network device.

[0574] The optional implementation of step S4205 can refer to the optional implementation of step S203 in Figure 2, the optional implementation of step S4105 in Figure 4A, and other related parts in the embodiments involved in Figures 2 and 4A, which will not be repeated here.

[0575] Step S4206: Send a first connection reestablishment request to the network device.

[0576] The optional implementation of step S406 can refer to the optional implementation of step S209 in Figure 2, the optional implementation of step S4106 in Figure 4A, and other related parts in the embodiments involved in Figures 2 and 4A, which will not be repeated here.

[0577] In some embodiments, the first relay terminal may send the first connection reestablishment request to the network device, but is not limited thereto. The first relay terminal may also send the first connection reestablishment request to other entities.

[0578] In some embodiments, the above steps are all optional steps.

[0579] In some embodiments, the embodiment shown in FIG. 4B may also be combined with at least one of steps S4107 , S4108 , and S4109 in the embodiment shown in FIG. 4A as a new embodiment.

[0580] FIG4C is a flow chart of a connection establishment method according to an embodiment of the present disclosure. As shown in FIG4C , the embodiment of the present disclosure relates to a connection establishment method, which can be executed by a first relay terminal, and the method includes:

[0581] Step S4301: Determine whether the connection has failed.

[0582] The optional implementation of step S4301 can refer to the optional implementation of step S202 in Figure 2, the optional implementation of step S4101 in Figure 4A, and other related parts in the embodiments involved in Figures 2 and 4A, which will not be repeated here.

[0583] Step S4302: Send a first instruction to the remote terminal.

[0584] The optional implementation of step S4302 can refer to the optional implementation of step S203 in Figure 2, the optional implementation of step S4102 in Figure 4A, and other related parts in the embodiments involved in Figures 2 and 4A, which will not be repeated here.

[0585] Step S4303: Obtain a second indication.

[0586] The optional implementation of step S4303 can refer to the optional implementation of step S205 in Figure 2, the optional implementation of step S4103 in Figure 4A, and other related parts in the embodiments involved in Figures 4A and 4A2, which will not be repeated here.

[0587] Step S4304: Maintain connection with the remote terminal according to the second instruction.

[0588] The optional implementation of step S4404 can refer to the optional implementation of step S206 in Figure 2, the optional implementation of step S4104 in Figure 4A, and other related parts in the embodiments involved in Figures 2 and 4A, which will not be repeated here.

[0589] In some embodiments, the above steps are all optional steps.

[0590] In some embodiments, the embodiment shown in FIG. 4C may also be combined with at least one of steps S4105 , S4106 , S4107 , S4108 , and S4109 in the embodiment shown in FIG. 4A as a new embodiment.

[0591] FIG4D is a flow chart of a connection establishment method according to an embodiment of the present disclosure. As shown in FIG4D , the embodiment of the present disclosure relates to a connection establishment method, which can be executed by a first relay terminal, and the method includes:

[0592] Step S4401: Determine whether the connection has failed.

[0593] The optional implementation of step S4401 can refer to the optional implementation of step S202 in Figure 2, the optional implementation of step S4101 in Figure 4A, and other related parts in the embodiments involved in Figures 2 and 4A, which will not be repeated here.

[0594] Step S4402: Send a first indication to the remote terminal.

[0595] The optional implementation of step S4402 can refer to the optional implementation of step S203 in Figure 2, the optional implementation of step S4102 in Figure 4A, and other related parts in the embodiments involved in Figures 2 and 4A, which will not be repeated here.

[0596] In some embodiments, the first indication is used by the remote terminal to determine whether to maintain connection with the first relay terminal.

[0597] In some embodiments, the method further comprises:

[0598] receiving a second indication sent by the remote terminal;

[0599] Maintain the connection with the remote terminal according to the second instruction.

[0600] In some embodiments, the method further comprises:

[0601] According to the second indication, a sixth indication is sent to the network device through a second cell or a third relay terminal that meets a second preset channel quality condition, where the sixth indication is used to instruct the reestablishment of the connection with the remote terminal.

[0602] In some embodiments, the method further comprises:

[0603] receiving a seventh instruction sent by the network device;

[0604] Maintaining the connection with the remote terminal according to the seventh instruction.

[0605] In some embodiments, the method further comprises:

[0606] According to the seventh indication, a sixth indication is sent to the network device through the second cell or the third relay terminal that meets the second preset channel quality condition, where the sixth indication is used to instruct the reestablishment of the connection with the remote terminal.

[0607] In some embodiments, the method further comprises:

[0608] A first connection reestablishment request is sent to the network device through the second cell or the third relay terminal that meets the second preset channel quality condition.

[0609] In some embodiments, the method further comprises:

[0610] receiving an eighth indication sent by the network device through the second cell or the third relay terminal, where the eighth indication is an indication sent by the network device when determining that the connection with the first relay terminal and the remote terminal is successfully reestablished;

[0611] Maintaining the connection with the remote terminal according to the eighth instruction.

[0612] In some embodiments, the method further comprises:

[0613] Determining that the connection with the first relay terminal is successfully reestablished;

[0614] Sending a third indication to the remote terminal.

[0615] In some embodiments, the method further comprises:

[0616] determining that the connection reestablishment of the first relay terminal fails;

[0617] A fifth indication is sent to the remote terminal, where the fifth indication is used to instruct the remote terminal to reestablish the connection.

[0618] In some embodiments, determining that the connection reestablishment of the first relay terminal fails includes at least one of the following:

[0619] determining that the second cell does not support relay operations;

[0620] determining that the second cell does not support a direct link;

[0621] determining that the second cell does not meet the second preset channel quality condition;

[0622] Determining that the third relay terminal does not meet the second preset channel quality condition;

[0623] determining that a second timer has timed out, where the second timer is started when a first connection reestablishment request is sent to the network device;

[0624] A ninth indication sent by the network device is received, where the ninth indication is an indication sent by the network device when determining that the connection reestablishment of the remote terminal fails.

[0625] In some embodiments, the fifth indication includes failure information when the first relay terminal determines that the connection reestablishment fails.

[0626] In some embodiments, the sixth indication includes a terminal identification of the remote terminal.

[0627] In some embodiments, the seventh indication includes a terminal identification of the remote terminal.

[0628] FIG5A is a flow chart of a connection establishment method according to an embodiment of the present disclosure. As shown in FIG5A , the embodiment of the present disclosure relates to a connection establishment method, which can be executed by a network device, and the method includes:

[0629] Step S5101: Send first configuration information.

[0630] The optional implementation of step S5101 can refer to the optional implementation of step S201 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0631] In some embodiments, the network device may send the first configuration information to the remote terminal, but is not limited thereto. The network device may also send the first configuration information to other entities.

[0632] In some embodiments, the network device may send first configuration information specified by the protocol.

[0633] In some embodiments, the network device may perform processing to obtain the first configuration information.

[0634] In some embodiments, step S5101 may be omitted, and the remote terminal may autonomously implement the function indicated by the first configuration information, or the above function may be default or acquiescent.

[0635] Step S5102: Obtain a sixth indication.

[0636] The optional implementation of step S5102 can refer to the optional implementation of step S203 in FIG2 and other related parts in the embodiment involved in FIG2 , which will not be described in detail here.

[0637] In some embodiments, the network device may receive the sixth indication sent by the first relay terminal, but is not limited thereto. The network device may also receive the sixth indication sent by other entities.

[0638] Optionally, the network device may reestablish the connection with the remote terminal according to the sixth instruction. For example, the network device may receive the sixth instruction and reestablish the connection with the remote terminal. For optional implementations thereof, see the optional implementations of step S208 in FIG. 2 and other related portions of the embodiment involved in FIG. 2 , which will not be described in detail here.

[0639] Step S5103: Reestablish the connection with the remote terminal according to the sixth instruction.

[0640] The optional implementation of step S5103 can refer to the optional implementation of step S208 in FIG2 and other related parts in the embodiment involved in FIG2 , which will not be described in detail here.

[0641] Step S5104: Obtain a first connection reestablishment request.

[0642] The optional implementation of step S5104 can refer to the optional implementation of step S209 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0643] In some embodiments, the network device may receive the first connection reestablishment request sent by the first relay terminal, but is not limited thereto. The network device may also receive the first connection reestablishment request sent by other entities.

[0644] Optionally, the network device may reestablish the connection with the first relay terminal according to the first connection reestablishment request. For example, the network device may receive the first connection reestablishment request and reestablish the connection with the first relay terminal. For optional implementations thereof, see the optional implementations of step S212 in FIG. 2 and other related portions of the embodiment involved in FIG. 2 , which will not be described in detail here.

[0645] Step S5105: Send the fourth instruction.

[0646] The optional implementation of step S5105 can refer to the optional implementation of step S210 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0647] In some embodiments, the network device may send a fourth indication to the remote terminal.

[0648] In some embodiments, step S5105 may be omitted, and the remote terminal may autonomously implement the function indicated by the fourth indication, or the above function may be default or acquiescent.

[0649] Step S5106: Reestablish the connection with the first relay terminal.

[0650] The optional implementation of step S5106 can refer to the optional implementation of step S212 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0651] Step S5107: Send the eighth instruction.

[0652] The optional implementation of step S5107 can refer to the optional implementation of step S213 in FIG2 and other related parts in the embodiment involved in FIG2 , which will not be described in detail here.

[0653] In some embodiments, the network device may send the eighth indication to the first relay terminal, but is not limited thereto. The network device may also send the eighth indication to other entities.

[0654] Optionally, the eighth indication may be used for the first relay terminal to maintain the connection with the remote terminal. For example, the first relay terminal may receive the eighth indication and maintain the connection with the remote terminal according to the eighth indication.

[0655] Step S5108: Obtain a second connection reestablishment request.

[0656] The optional implementation of step S5108 can refer to the optional implementation of step S216 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0657] In some embodiments, the network device may receive the second connection reestablishment request sent by the remote terminal, but is not limited thereto. The network device may also receive the second connection reestablishment request sent by other entities.

[0658] Optionally, the network device may perform connection reestablishment according to the second connection reestablishment request. For example, the network device may receive the second connection reestablishment request and reestablish the connection with the remote terminal according to the second connection reestablishment request.

[0659] The method involved in the embodiments of the present disclosure may include at least one of the above steps S5101 to S5108. For example, step S5101 can be implemented as an independent embodiment, step S5108 can be implemented as an independent embodiment, steps S5102 + S5103 can be implemented as independent embodiments, steps S5104 + S5105 can be implemented as independent embodiments, steps S5104 + S5106 can be implemented as independent embodiments, and steps S5104 + S5106 + S5107 can be implemented as independent embodiments, but the present invention is not limited thereto.

[0660] In some embodiments, the above steps S5101 to S5108 can be executed in a swapped order or simultaneously. For example, steps S5101 and S5102 can be executed in a swapped order or simultaneously.

[0661] In some embodiments, steps S5101 to S5108 are all optional steps. For example, steps S5101, S5102, S5103, and S5105 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0662] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 5A .

[0663] FIG5B is a flow chart of a connection establishment method according to an embodiment of the present disclosure. As shown in FIG5B , the embodiment of the present disclosure relates to a connection establishment method, which can be executed by a network device, and the method includes:

[0664] Step S5201: Obtain a sixth indication.

[0665] The optional implementation of step S5201 can refer to the optional implementation of step S203 in Figure 2, the optional implementation of step S5102 in Figure 5A, and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0666] Step S5202: Reestablish the connection with the remote terminal according to the sixth instruction.

[0667] The optional implementation of step S5202 can refer to the optional implementation of step S208 in Figure 2, the optional implementation of step S5103 in Figure 5A, and other related parts in the embodiments involved in Figures 2 and 5A, which will not be repeated here.

[0668] Step S5203: Obtain a first connection reestablishment request.

[0669] The optional implementation of step S5203 can refer to the optional implementation of step S209 in Figure 2, the optional implementation of step S5104 in Figure 5A, and other related parts in the embodiments involved in Figures 2 and 5A, which will not be repeated here.

[0670] Step S5204: Send the fourth instruction.

[0671] The optional implementation of step S5204 can refer to the optional implementation of step S210 in Figure 2, the optional implementation of step S5105 in Figure 5A, and other related parts in the embodiments involved in Figures 2 and 5A, which will not be repeated here.

[0672] Step S5205: Reestablish the connection with the first relay terminal.

[0673] The optional implementation of step S5205 can refer to the optional implementation of step S212 in Figure 2, the optional implementation of step S5106 in Figure 5A, and other related parts in the embodiments involved in Figures 2 and 5A, which will not be repeated here.

[0674] In some embodiments, the above steps are all optional steps.

[0675] In some embodiments, the embodiment shown in FIG. 5B may also be combined with at least one of steps S5101 , S5107 , and S5108 in the embodiment shown in FIG. 5A as a new embodiment.

[0676] FIG5C is a flow chart of a connection establishment method according to an embodiment of the present disclosure. As shown in FIG5C , the embodiment of the present disclosure relates to a connection establishment method, which can be executed by a network device, and the method includes:

[0677] Step S5301: Send first configuration information.

[0678] The optional implementation of step S5301 can refer to the optional implementation of step S201 in Figure 2, the optional implementation of step S5101 in Figure 5A, and other related parts in the embodiments involved in Figures 2 and 5A, which will not be repeated here.

[0679] In some embodiments, the first configuration information indicates whether the remote terminal maintains the connection with the first relay terminal when the connection with the first relay terminal fails.

[0680] In some embodiments, the method further comprises:

[0681] A seventh indication is sent to the first relay terminal, where the seventh indication is used to instruct the first relay terminal to maintain the connection with the remote terminal.

[0682] In some embodiments, the method further comprises:

[0683] receiving a sixth indication sent by the first relay terminal;

[0684] Reestablish the connection with the remote terminal according to the sixth indication.

[0685] In some embodiments, the method further comprises:

[0686] receiving a first connection reestablishment request sent by the first relay terminal;

[0687] Reestablishing the connection with the first relay terminal according to the first connection reestablishment request.

[0688] In some embodiments, the method further comprises:

[0689] Determining that the connection with the first relay terminal and the remote terminal is successfully reestablished;

[0690] An eighth indication is sent to the first relay terminal, where the eighth indication is used to instruct the first relay terminal to maintain the connection with the remote terminal.

[0691] In some embodiments, the method further comprises:

[0692] Determining that the connection reestablishment of the remote terminal fails;

[0693] A ninth instruction is sent to the first relay terminal, where the ninth instruction is used to instruct the first relay terminal to send a fifth instruction to the remote terminal, where the fifth instruction is used to instruct the remote terminal to reestablish the connection.

[0694] In some embodiments, the method further comprises:

[0695] receiving a first connection reestablishment request sent by the first relay terminal;

[0696] A fourth indication is sent to the remote terminal, where the fourth indication is used for the remote terminal to perform radio bearer transmission.

[0697] Figure 6 is an interactive diagram of a connection establishment method according to an embodiment of the present disclosure. As shown in Figure 6, an embodiment of the present disclosure relates to a connection establishment method, which can be executed by a communication system and can include:

[0698] Step S601: The network device sends first configuration information to a remote terminal.

[0699] The first configuration information indicates whether the remote terminal maintains the connection with the first relay terminal when the connection with the first relay terminal fails.

[0700] The optional implementation of step S601 can refer to the optional implementation of step S201 in Figure 2, the optional implementation of step S5101 in Figure 5A, and other related parts in the embodiments involved in Figures 2 and 5A, which will not be repeated here.

[0701] Step S602: The first relay terminal determines that the connection fails.

[0702] The optional implementation of step S602 can refer to the optional implementation of step S201 in Figure 2, the optional implementation of step S4101 in Figure 4A, and other related parts in the embodiments involved in Figures 2 and 4A, which will not be repeated here.

[0703] Step S603: The first relay terminal sends a first instruction to the remote terminal.

[0704] The first indication is used by the remote terminal to determine whether to maintain the connection with the first relay terminal.

[0705] The optional implementation of step S603 can refer to the optional implementation of step S201 in Figure 2, the optional implementation of step S4102 in Figure 4A, and other related parts in the embodiments involved in Figures 2 and 4A, which will not be repeated here.

[0706] Step S604: The remote terminal determines whether to maintain the connection with the first relay terminal.

[0707] The optional implementation of step S605 can refer to the optional implementation of step S201 in Figure 2, the optional implementation of step S3103 in Figure 3A, and other related parts in the embodiments involved in Figures 2 and 3A, which will not be repeated here.

[0708] In some embodiments of the present disclosure, a connection establishment method is provided for a remote terminal. The method may include at least one of the following embodiments:

[0709] In embodiment 1, the remote terminal receives a first failure indication sent by the relay terminal, determines whether to perform RRC reconstruction, and restores the connection with the network.

[0710] In embodiment 2, based on embodiment 1, the remote terminal determines to continue to maintain the connection with the relay terminal, suspends the transmission of all radio bearers, and uses the default configuration of SRB.

[0711] In embodiment 3, based on embodiment 1, the remote terminal determines to release the connection with the relay terminal, selects a suitable relay terminal or cell, and sends an RRC reestablishment request message to the network device.

[0712] In embodiment 4, based on embodiments 2 and 3, the remote terminal receives a first configuration sent by the network device, indicating that the remote terminal maintains a connection with the relay terminal when the relay terminal fails. The remote terminal determines whether to continue to maintain a connection with the relay terminal based on the first configuration.

[0713] Example 5, based on Example 2, starts the first timer, determines that the first timer has timed out, starts RRC reconstruction, releases the connection with the relay terminal, selects a suitable relay terminal or cell, and sends an RRC reconstruction request message to the network device.

[0714] Embodiment 6, based on embodiment 2, sends a first instruction to the relay terminal, instructing to maintain the connection with the relay terminal.

[0715] Example 7, based on Examples 1 and 2, receives a second failure indication sent by the relay terminal, starts RRC reestablishment, releases the connection with the relay terminal, selects a suitable relay terminal or cell, and sends an RRC reestablishment request message to the network device.

[0716] Example 8, based on Examples 1 and 2, receives an RRC reconstruction message sent by a network device, updates the key, and resumes transmission of all radio bearers.

[0717] Embodiment 9, based on embodiments 7 and 8, receives a second failure indication sent by the relay terminal and stops the first timer.

[0718] Embodiment 10, based on embodiments 1 and 2, receives a reestablishment success indication sent by the relay terminal and stops the first timer.

[0719] In some embodiments of the present disclosure, a connection establishment method is provided for a relay terminal. The method may include at least one of the following embodiments:

[0720] In embodiment 1, it is determined that a connection failure occurs, a first indication is sent to a remote terminal, RRC reestablishment is initiated, a suitable relay UE or cell is selected, and an RRC reestablishment request message is sent to a network device.

[0721] In one implementation, the connection failure may be a handover failure.

[0722] In one implementation, a channel measurement result of a relay UE or a cell is higher than a preset value, and the relay UE or cell is determined to be a suitable relay terminal or cell.

[0723] Embodiment 2, based on embodiment 1, receives a first indication sent by a remote terminal, and sends a second indication to the network device, indicating that a remote terminal maintains the connection for reestablishment.

[0724] In one implementation, the second indication may be carried in an RRC re-establishment request message or an RRC re-establishment completion message.

[0725] Embodiment 3, based on embodiment 2, the second indication may be an identifier of the remote terminal.

[0726] In one implementation, the remote terminal is a remote terminal that maintains a connection for reestablishment.

[0727] Embodiment 4, based on embodiment 1, receives a third instruction sent by the network device, instructing to maintain the remote terminal connection.

[0728] In one implementation, the third indication may be carried in an RRC reconstruction message or an RRC reconfiguration message.

[0729] Embodiment 5, based on embodiment 4, the third indication may be an identifier of the remote terminal.

[0730] Embodiment 6, based on embodiment 4, sends a reestablishment success indication to the remote terminal.

[0731] In one implementation, if the third indication is a remote terminal identifier, a reestablishment success indication is sent to the remote terminal identified by the remote terminal identifier.

[0732] In embodiment 7, based on embodiment 1, the relay terminal determines that the RRC reestablishment fails and sends a second failure indication to the remote terminal.

[0733] In one implementation, the relay terminal determines that the re-establishment fails according to the expiration of the T311 timer. The relay terminal determines that the re-establishment fails according to the selected cell or the relay terminal not meeting the preset channel condition.

[0734] Embodiment 8, based on embodiment 1, the target cell selected by the relay terminal does not support relay or sidelink, and a second failure indication is sent to the remote terminal.

[0735] Embodiment 9, based on embodiment 7 or 8, carries the failure cause in the second failure indication.

[0736] In one implementation, the failure reason may be any of the following: timer expiration, inappropriate cell or relay terminal selection, cell not supporting relay, cell not supporting sidelink.

[0737] In some embodiments of the present disclosure, a communication system is provided, which may include a remote terminal, a first relay terminal and a network device, wherein the remote terminal can execute the connection establishment method executed by the remote terminal in the aforementioned embodiment of the present disclosure; the first relay terminal can execute the connection establishment method executed by the first relay terminal in the aforementioned embodiment of the present disclosure; and the network device can execute the connection establishment method executed by the network device in the aforementioned embodiment of the present disclosure.

[0738] 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 remote terminal in any of the above methods. For another example, an apparatus is provided, comprising units or modules for implementing each step performed by a first relay 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 function node, a core network device, etc.) in any of the above methods.

[0739] 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), and the functions of some or all of the above units or modules are realized 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.

[0740] 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 a 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 to implement 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 ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc.

[0741] Figure 7A is a schematic diagram of the structure of a remote terminal proposed in an embodiment of the present disclosure. As shown in Figure 7A, the remote terminal 151 may include: at least one of a transceiver module 8101 and a processing module 8102. In some embodiments, the transceiver module 8101 is configured to receive a first indication; the first indication is an indication sent by the first relay terminal when it determines that the connection has failed; and the processing module 8102 is configured to determine whether to maintain the connection with the first relay terminal. Optionally, the transceiver module 8101 can be used to perform at least one of the communication steps such as sending and / or receiving performed by the remote terminal 151 in any of the above methods (for example, step S201, step S203, step S205, step S210, but not limited thereto), which are not described in detail here. Optionally, the processing module 8102 can be used to perform at least one of the other steps (for example, step S204, step S211, but not limited thereto) performed by the remote terminal 151 in any of the above methods, which are not described in detail here.

[0742] Figure 7B is a schematic diagram of the structure of a first relay terminal proposed in an embodiment of the present disclosure. As shown in Figure 7B, the first relay terminal 153 may include: at least one of a processing module 8201 and a transceiver module 8202. In some embodiments, the processing module 8201 is configured to determine a connection failure; the transceiver module 8202 is configured to determine to send a first indication to a remote terminal, where the first indication is used by the remote terminal to determine whether to maintain the connection with the first relay terminal. Optionally, the processing module 8201 may be configured to execute at least one of the communication steps such as sending and / or receiving performed by the first relay terminal 153 in any of the above methods (e.g., step S206 and step S214, but not limited thereto), which are not further described here. Optionally, the transceiver 8202 may be configured to execute at least one of the other steps performed by the first relay terminal 153 in any of the above methods (e.g., step S203, step S205, step S207, step S209, step S213, but not limited thereto), which are not further described here.

[0743] Figure 7C is a schematic diagram of the structure of a network device proposed in an embodiment of the present disclosure. As shown in Figure 7C, the network device 160 may include at least: a transceiver module 8301. In some embodiments, the transceiver module 8301 is configured to send first configuration information to a remote terminal, wherein the first configuration information indicates whether the remote terminal maintains a connection with the first relay terminal when the connection with the first relay terminal fails. Optionally, the transceiver module 8301 can be used to execute at least one of the communication steps such as sending and / or receiving (for example, step S201, step S207, step S209, step S213, but not limited thereto) performed by the network device 160 in any of the above methods, which will not be repeated here.

[0744] 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.

[0745] 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.

[0746] Figure 8A is a schematic diagram of the structure of a communication device 9100 proposed in an embodiment of the present disclosure. Communication device 9100 can be a network device (e.g., an access network device, a core network device, etc.), or a terminal device (e.g., a user device, etc.), or a chip, chip system, or processor that supports a network device to implement any of the above methods, or a chip, chip system, or processor that supports a terminal device to implement any of the above methods. Communication device 9100 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.

[0747] As shown in FIG8A , the communication device 9100 includes one or more processors 9101. The processor 9101 may be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor may be used to process communication protocols and communication data, and the central processing unit may be used to control a communication device (e.g., a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute programs, and process program data. The communication device 9100 is used to perform any of the above methods.

[0748] In some embodiments, the communication device 9100 further includes one or more memories 9102 for storing instructions. Optionally, all or part of the memories 9102 may be located outside the communication device 9100.

[0749] In some embodiments, the communication device 9100 further includes one or more transceivers 9103. When the communication device 9100 includes one or more transceivers 9103, the transceiver 9103 performs at least one of the communication steps such as sending and / or receiving in the above method (for example, step S2101, step S2102, step S2104, step S2106, but not limited thereto), and the processor 9101 performs at least one of the other steps (for example, step S2103, step S2105, step S2107, but not limited thereto).

[0750] 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.

[0751] In some embodiments, the communication device 9100 may include one or more interface circuits. Optionally, the interface circuits are connected to the memory 9102 and may be used to receive signals from the memory 9102 or other devices, or to send signals to the memory 9102 or other devices. For example, the interface circuits may read instructions stored in the memory 9102 and send the instructions to the processor 9101.

[0752] The communication device 9100 described in the above embodiments may be a network device or a terminal device, but the scope of the communication device 9100 described in the present disclosure is not limited thereto, and the structure of the communication device 9100 may not be limited by FIG. 8A. 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 or 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.

[0753] FIG8B is a schematic diagram of the structure of the chip 9200 proposed in an embodiment of the present disclosure. If the communication device 9100 can be a chip or a chip system, please refer to the schematic diagram of the structure of the chip 9200 shown in FIG8B, but the present disclosure is not limited thereto.

[0754] The chip 9200 includes one or more processors 9201 , and the chip 9200 is configured to execute any of the above methods.

[0755] In some embodiments, the chip 9200 further includes one or more interface circuits 9203. Optionally, the interface circuit 9203 is connected to the memory 9202. The interface circuit 9203 can be used to receive signals from the memory 9202 or other devices, and can be used to send signals to the memory 9202 or other devices. For example, the interface circuit 9203 can read instructions stored in the memory 9202 and send the instructions to the processor 9201.

[0756] In some embodiments, the interface circuit 9203 executes at least one of the communication steps such as sending and / or receiving in the above method (for example, step S2101, step S2102, step S2104, step S2106, but not limited to these), and the processor 9201 executes at least one of the other steps (for example, step S2103, step S2105, step S2107, but not limited to these).

[0757] In some embodiments, terms such as interface circuit, interface, transceiver pin, and transceiver may be used interchangeably.

[0758] In some embodiments, the chip 9200 further includes one or more memories 9202 for storing instructions. Alternatively, all or part of the memory 9202 may be located outside the chip 9200.

[0759] The embodiments of the present disclosure further provide a storage medium having instructions stored thereon, which, when executed on the communication device 9100, causes the communication device 9100 to execute 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 temporary storage medium.

[0760] The embodiments of the present disclosure further provide a program product, which, when executed by the communication device 9100, enables the communication device 9100 to perform any of the above methods. Optionally, the program product may be a computer program product.

[0761] The embodiments of the present disclosure also provide a computer program, which, when executed on a computer, enables the computer to execute any one of the above methods.

Claims

1. A connection establishment method, characterized in that: The method comprises: The remote terminal receives a first indication; the first indication is an indication sent by the first relay terminal when determining that the connection fails; Determine whether to maintain the connection with the first relay terminal.

2. The method according to claim 1, characterized in that The determining whether to maintain the connection with the first relay terminal comprises: Determine to maintain the connection with the first relay terminal.

3. The method according to claim 2, characterized in that The method further comprises: The second indication is sent to the first relay terminal, where the second indication is used to instruct the first relay terminal to maintain the connection with the remote terminal.

4. The method according to claim 2 or 3, characterized in that: The method further comprises: A third indication is received, where the third indication is an indication sent by the first relay terminal when determining that the connection reestablishment is successful.

5. The method according to claim 2 or 3, characterized in that: The method further comprises: receiving a fourth indication, where the fourth indication is an indication sent by the network device after receiving the first connection reestablishment request sent by the first relay terminal; Perform radio bearer transmission according to the fourth instruction.

6. The method according to claim 2 or 3, characterized in that: The method further comprises: Determining that the connection reestablishment of the first relay terminal fails; A second connection reestablishment request is sent to the network device through the first cell or the second relay terminal that meets the first preset channel quality condition.

7. The method according to claim 6, characterized in that The determining that the connection reestablishment of the first relay terminal fails comprises at least one of the following: receiving a fifth indication, where the fifth indication is an indication sent by the first relay terminal when determining that the connection reestablishment fails; It is determined that a first timer has timed out, wherein the first timer is started when it is determined to maintain the connection with the first relay terminal.

8. The method according to claim 1, characterized in that The determining whether to maintain the connection with the first relay terminal comprises: determining not to maintain the connection with the first relay terminal; The method further comprises: A second connection reestablishment request is sent to the network device through the first cell or the second relay terminal that meets the first preset channel quality condition.

9. The method according to any one of claims 1 to 8, characterized in that: The method further comprises: receiving first configuration information sent by a network device, where the first configuration information indicates whether the remote terminal maintains a connection with the first relay terminal when the connection with the first relay terminal fails; The determining whether to maintain the connection with the first relay terminal comprises: Determine whether to maintain connection with the first relay terminal according to the first configuration information.

10. A connection establishment method, characterized in that: The method comprises: The first relay terminal determines that the connection fails; A first indication is sent to a remote terminal, where the first indication is used by the remote terminal to determine whether to maintain a connection with the first relay terminal.

11. The method according to claim 10, characterized in that The method further comprises: receiving a second indication sent by the remote terminal; Maintain the connection with the remote terminal according to the second instruction.

12. The method according to claim 11, characterized in that The method further comprises: According to the second indication, a sixth indication is sent to the network device through a second cell or a third relay terminal that meets a second preset channel quality condition, wherein the sixth indication is used to indicate the reestablishment of the connection with the remote terminal.

13. The method according to claim 10, characterized in that The method further comprises: receiving a seventh instruction sent by the network device; Maintaining the connection with the remote terminal according to the seventh instruction.

14. The method according to claim 13, characterized in that The method further comprises: According to the seventh indication, a sixth indication is sent to the network device through a second cell or a third relay terminal that meets a second preset channel quality condition, wherein the sixth indication is used to indicate the reestablishment of the connection with the remote terminal.

15. The method according to any one of claims 10 to 14, characterized in that: The method further comprises: A first connection reestablishment request is sent to the network device through the second cell or the third relay terminal that meets the second preset channel quality condition.

16. The method according to claim 15, characterized in that The method further comprises: receiving an eighth indication sent by the network device through the second cell or the third relay terminal, wherein the eighth indication is an indication sent by the network device when determining that the connection with the first relay terminal and the remote terminal is successfully reestablished; Maintain connection with the remote terminal according to the eighth instruction.

17. The method according to claim 15 or 16, characterized in that The method further comprises: Determining that the connection of the first relay terminal is successfully reestablished; Sending a third indication to the remote terminal.

18. The method according to claim 15, characterized in that The method further comprises: Determining that the connection reestablishment of the first relay terminal fails; A fifth indication is sent to the remote terminal, where the fifth indication is used to instruct the remote terminal to reestablish the connection.

19. The method according to claim 18, characterized in that The determining that the connection reestablishment of the first relay terminal fails comprises at least one of the following: Determining that the second cell does not support relay operation; Determining that the second cell does not support a direct link; Determining that the second cell does not meet the second preset channel quality condition; Determining that the third relay terminal does not meet the second preset channel quality condition; Determining that a second timer has timed out, where the second timer is started when the first connection reestablishment request is sent to the network device; A ninth indication sent by the network device is received, where the ninth indication is an indication sent by the network device when determining that the connection reestablishment of the remote terminal fails.

20. The method according to claim 18 or 19, characterized in that The fifth indication includes failure information when the first relay terminal determines that the connection reestablishment fails.

21. The method according to claim 12 or 14, characterized in that The sixth indication includes a terminal identifier of the remote terminal.

22. The method according to claim 13 or 14, characterized in that The seventh indication includes the terminal identification of the remote terminal.

23. A connection establishment method, characterized in that: The method comprises: The network device sends first configuration information to a remote terminal, where the first configuration information indicates whether the remote terminal maintains a connection with the first relay terminal when a connection with the first relay terminal fails.

24. The method according to claim 23, characterized in that The method further comprises: A seventh indication is sent to the first relay terminal, where the seventh indication is used to instruct the first relay terminal to maintain the connection with the remote terminal.

25. The method according to claim 24, characterized in that The method further comprises: receiving a sixth indication sent by the first relay terminal; Reestablish a connection with the remote terminal according to the sixth indication.

26. The method according to any one of claims 23 to 25, characterized in that: The method further comprises: receiving a first connection reestablishment request sent by the first relay terminal; Reestablishing the connection with the first relay terminal according to the first connection reestablishment request.

27. The method according to claim 26, characterized in that The method further comprises: Determining that the connection with the first relay terminal and the remote terminal is successfully reestablished; An eighth indication is sent to the first relay terminal, where the eighth indication is used to instruct the first relay terminal to maintain the connection with the remote terminal.

28. The method according to claim 26, characterized in that The method further comprises: Determining that the connection reestablishment of the remote terminal fails; A ninth indication is sent to the first relay terminal, where the ninth indication is used to instruct the first relay terminal to send a fifth indication to the remote terminal, where the fifth indication is used to instruct the remote terminal to reestablish a connection.

29. The method according to claim 26 or 27, characterized in that The method further comprises: receiving a first connection reestablishment request sent by the first relay terminal; A fourth indication is sent to the remote terminal, where the fourth indication is used for the remote terminal to perform wireless bearer transmission.

30. A connection establishment method, characterized in that: The method comprises: The first relay terminal determines that the connection fails; The first relay terminal sends a first indication to the remote terminal, where the first indication is used by the remote terminal to determine whether to maintain a connection with the first relay terminal; The remote terminal determines whether to maintain the connection with the first relay terminal.

31. A remote terminal, characterized in that: include: A transceiver module, configured to receive a first indication; The first indication is an indication sent by the first relay terminal when determining that the connection fails; The processing module is configured to determine whether to maintain the connection with the first relay terminal.

32. A first relay terminal, characterized in that: include: a processing module configured to determine a connection failure; The transceiver module is configured to send a first indication to a remote terminal, where the first indication is used by the remote terminal to determine whether to maintain a connection with the first relay terminal.

33. A network device, characterized in that: include: The transceiver module is configured to send first configuration information to a remote terminal, wherein the first configuration information indicates whether the remote terminal maintains a connection with the first relay terminal when the connection with the first relay terminal fails.

34. A remote terminal, characterized in that: include: one or more processors; The remote terminal is used to execute the connection establishment method described in any one of claims 1-9.

35. A first relay terminal, characterized in that: include: one or more processors; The relay terminal is used to execute the connection establishment method described in any one of claims 10-22.

36. A network device, characterized in that: include: one or more processors; Wherein, the network device is used to execute the connection establishment method described in any one of claims 23-29.

37. A communication system, characterized in that: It includes a remote terminal, a first relay terminal and a network device, wherein the remote terminal is configured to implement the connection establishment method described in any one of claims 1-9, the first relay terminal is configured to implement the connection establishment method described in any one of claims 10-22, and the network device is configured to implement the connection establishment method described in any one of claims 23-29.

38. A storage medium storing instructions, characterized in that: When the instruction is executed on a communication device, the communication device executes the connection establishment method according to any one of claims 1 to 9, claims 10 to 22, or claims 23 to 29.

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