CN117136628A

CN117136628A - Connection establishment method, device and storage medium

Info

Publication number: CN117136628A
Application number: CN202380010175.8A
Authority: CN
Inventors: 杨星
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2023-07-18
Filing date: 2023-07-18
Publication date: 2023-11-28

Abstract

The present disclosure relates to a connection establishment method, apparatus, and storage medium. The method comprises the following steps: the remote terminal receives a first indication; the first indication is an indication sent when the first relay terminal determines that the connection fails; it is determined whether to maintain a connection with the first relay terminal. In this way, when the first relay terminal determines that the connection fails, the first indication may be sent to the remote terminal, and the remote terminal may determine whether to maintain the connection with the first relay terminal according to the first indication, and when the remote terminal determines that the connection with the first relay terminal is maintained, may perform connection reestablishment together with the first relay terminal, so that signaling overhead may be saved.

Description

Connection establishment method, device and storage medium

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a connection establishment method, device, and storage medium.

Background

The remote User Equipment (UE) may not be directly connected to the network device, and may implement communication with the network device through the relay UE, and when the radio resource control (Radio Resource Control, RRC) connection of the relay UE fails, a notification message is sent to the connected remote UE through the direct link, and when the remote UE receives the notification message, RRC connection reestablishment is triggered.

Disclosure of Invention

The embodiment of the disclosure provides a connection establishment method, device and storage medium.

According to a first aspect of embodiments of the present disclosure, there is provided a connection establishment method, the method including:

the remote terminal receives a first indication; the first indication is an indication sent when the first relay terminal determines that the connection fails;

it is determined whether to maintain a connection with the first relay terminal.

According to a second aspect of embodiments of the present disclosure, there is provided a connection establishment method, the method comprising:

the first relay terminal determines connection failure;

and sending a first indication to a remote terminal, wherein the first indication is used for the remote terminal to determine whether to keep connection with the first relay terminal.

According to a third aspect of embodiments of the present disclosure, there is provided a connection establishment method, the method comprising:

the network device sends first configuration information to a remote terminal, wherein the first configuration information indicates whether the remote terminal maintains connection with a first relay terminal when the connection of the first relay terminal fails.

According to a fourth aspect of embodiments of the present disclosure, there is provided a connection establishment method, the method comprising:

the first relay terminal determines connection failure;

A first relay terminal sends a first indication to a remote terminal, wherein the first indication is used for the remote terminal to determine whether to keep connection with the first relay terminal;

the remote terminal determines whether to maintain a connection with the first relay terminal.

According to a fifth aspect of embodiments of the present disclosure, there is provided a remote terminal comprising:

a transceiver module configured to receive a first indication; the first indication is an indication sent when the first relay terminal determines that the connection fails;

and a processing module configured to determine whether to maintain a connection with the first relay terminal.

According to a sixth aspect of the embodiments of the present disclosure, there is provided a first relay terminal, including:

a processing module configured to determine a connection failure;

and a transceiver module configured to send a first indication to a remote terminal, the first indication being used by the remote terminal to determine whether to maintain a connection with the first relay terminal.

According to a seventh aspect of embodiments of the present disclosure, there is provided a network device comprising:

and the transceiver module is configured to send first configuration information to the remote terminal, wherein the first configuration information indicates whether the remote terminal maintains connection with the first relay terminal when the connection of the first relay terminal fails.

According to an eighth aspect of embodiments of the present disclosure, there is provided a remote terminal comprising:

one or more processors;

wherein the remote terminal may be adapted to perform the alternative implementation of the first aspect.

According to a ninth aspect of the embodiments of the present disclosure, there is provided a first relay terminal, including:

one or more processors;

wherein the remote terminal may be adapted to perform the alternative implementation of the second aspect.

According to a tenth aspect of embodiments of the present disclosure, there is provided a network device comprising:

one or more processors;

wherein the network device may be adapted to perform the optional implementation of the third aspect.

According to an eleventh aspect of embodiments of the present disclosure, there is provided a communication system, which may comprise a remote terminal configured to perform the method as described in the alternative implementation of the first aspect, a first relay terminal configured to perform the method as described in the alternative implementation of the second aspect, and a network device configured to perform the method as described in the alternative implementation of the third aspect.

According to a twelfth aspect of embodiments of the present disclosure, there is provided a storage medium storing instructions that, when executed on a communication device, cause the communication device to perform a method as described in the alternative implementation of the first or second or third aspect.

The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects: the remote terminal receives a first indication; the first indication is an indication sent when the first relay terminal determines that the connection fails; it is determined whether to maintain a connection with the first relay terminal. In this way, when the first relay terminal determines that the connection fails, the first indication may be sent to the remote terminal, and the remote terminal may determine whether to maintain the connection with the first relay terminal according to the first indication, and when the remote terminal determines that the connection with the first relay terminal is maintained, may perform connection reestablishment together with the first relay terminal, so that signaling overhead may be saved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following description of the embodiments refers to the accompanying drawings, which are only some embodiments of the present disclosure, and do not limit the protection scope of the present disclosure in any way.

Fig. 1A is a schematic architecture diagram of a communication system shown in accordance with an embodiment of the present disclosure.

Fig. 1B is a schematic diagram illustrating a traffic data transmission according to an embodiment of the present disclosure.

Fig. 2 is an interactive schematic diagram illustrating a connection establishment method according to an embodiment of the present disclosure.

Fig. 3A is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure.

Fig. 3B is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure.

Fig. 3C is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure.

Fig. 3D is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure.

Fig. 4A is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure.

Fig. 4B is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure.

Fig. 4C is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure.

Fig. 4D is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure.

Fig. 5A is a flow diagram illustrating a connection establishment method according to an embodiment of the present disclosure.

Fig. 5B is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure.

Fig. 5C is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure.

Fig. 6 is an interactive schematic diagram illustrating a connection establishment method according to an embodiment of the present disclosure.

Fig. 7A is a schematic structural diagram of a remote terminal according to an embodiment of the present disclosure.

Fig. 7B is a schematic structural diagram of a first relay terminal according to an embodiment of the present disclosure.

Fig. 7C is a schematic structural diagram of a network device according to an embodiment of the present disclosure.

Fig. 8A is a schematic structural diagram of a communication device according to an embodiment of the present disclosure.

Fig. 8B is a schematic structural diagram of a chip according to an embodiment of the disclosure.

Detailed Description

In a first aspect, an embodiment of the present disclosure proposes a connection establishment method, where the method includes:

In the above embodiment, the remote terminal may receive the first indication sent by the first relay terminal when determining that the connection fails, and select whether to maintain the connection with the first relay terminal, so that a connection reestablishing manner may be selected, and flexibility of connection establishment is improved.

With reference to some embodiments of the first aspect, in some embodiments, the determining whether to maintain a connection with the first relay terminal includes:

it is determined to maintain a connection with the first relay terminal.

In the above embodiment, the remote terminal may receive the first indication sent when the first relay terminal determines that the connection fails, keep the connection with the first relay terminal, and perform connection reestablishment together with the first relay terminal, so that signaling overhead may be saved.

With reference to some embodiments of the first aspect, in some embodiments, the method further includes:

and sending the second instruction to the first relay terminal, wherein the second instruction is used for indicating the first relay terminal to keep the connection with the remote terminal.

In the above embodiment, after the remote terminal determines to maintain the connection with the first relay terminal, the second indication may be sent to the first relay terminal, so that the first relay terminal may perform connection reestablishment together with the remote terminal, thereby saving signaling overhead.

and receiving a third indication, wherein the third indication is sent when the first relay terminal determines that connection reestablishment is successful.

In the above embodiment, the remote terminal may receive the indication sent by the first relay terminal when the connection reestablishment is successful, so that the remote terminal may timely resume the service suspended when the connection of the first relay terminal fails, thereby improving the service quality of the remote terminal.

receiving a fourth instruction, wherein the fourth instruction is an instruction sent by network equipment after receiving a first connection reestablishment request sent by the first relay terminal;

and carrying out radio bearer transmission according to the fourth indication.

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

determining that the connection reestablishment of the first relay terminal fails;

and sending a second connection reestablishment request to the network equipment through the first cell or the second relay terminal meeting the first preset channel quality condition.

In the above embodiment, the remote terminal may perform connection reestablishment through the first cell or the second relay terminal that satisfies the first preset channel quality condition, thereby improving reliability of connection reestablishment.

With reference to some embodiments of the first aspect, in some embodiments, the determining that the connection of the first relay terminal fails to reestablish includes at least one of:

receiving a fifth instruction, wherein the fifth instruction is an instruction sent when the first relay terminal determines that connection reestablishment fails;

a first timer is determined to timeout, the first timer being started upon determining to maintain a connection with the first relay terminal.

In the above embodiment, the remote terminal may determine whether the first relay terminal is reconnected to the terminal in multiple manners, so as to improve reliability of the determination.

determining that connection with the first relay terminal is not maintained;

the method further comprises the steps of:

In the above embodiment, the remote terminal may release the connection with the first relay terminal, and perform connection reestablishment through the first cell or the second relay terminal that satisfies the first preset channel quality condition, thereby improving reliability of connection reestablishment.

receiving first configuration information sent by network equipment, wherein the first configuration information indicates whether the remote terminal maintains connection with the first relay terminal when the connection of the first relay terminal fails;

the determining whether to maintain a connection with the first relay terminal includes:

and determining whether to keep connection with the first relay terminal according to the first configuration information.

In the above embodiment, the network device may send the first configuration information to the remote terminal, and when the remote terminal determines that the connection of the first relay terminal fails, it may determine whether to keep the connection with the first relay terminal according to the first configuration information, so that a manner of indicating connection reestablishment is more flexible.

In a second aspect, an embodiment of the present disclosure proposes a connection establishment method, the method including:

the first relay terminal determines connection failure;

In the above embodiment, when the first relay terminal determines that the connection fails, the first indication may be sent to the remote terminal, and the remote terminal may select whether to maintain the connection with the first relay terminal, so that a connection reestablishing manner may be selected, and flexibility of connection establishment is improved.

With reference to some embodiments of the second aspect, in some embodiments, the method further includes:

receiving a second indication sent by the remote terminal;

and maintaining connection with the remote terminal according to the second instruction.

and according to the second indication, a sixth indication is sent to the network equipment through a second cell or a third relay terminal meeting a second preset channel quality condition, wherein the sixth indication is used for indicating to reestablish the connection with the remote terminal.

In the above embodiment, the first relay terminal may instruct the network device to reestablish the connection of the remote terminal through the second cell or the third relay terminal, so as to improve flexibility of reestablishing the connection of the remote terminal.

receiving a seventh indication sent by the network equipment;

and maintaining a connection with the remote terminal according to the seventh indication.

In the above embodiment, the first relay terminal may maintain the connection with the remote terminal by the indication of the network device, so that the manner of indicating the connection maintenance is more flexible.

and according to the seventh indication, a sixth indication is sent to the network equipment through a second cell or a third relay terminal meeting a second preset channel quality condition, wherein the sixth indication is used for indicating to reestablish the connection with the far-end terminal.

and sending a first connection reestablishment request to the network equipment through a second cell or a third relay terminal which meets a second preset channel quality condition.

In the above embodiment, the first relay terminal may reestablish the connection through the second cell or the third relay terminal that satisfies the second preset channel quality condition, thereby improving reliability of connection reestablishment.

receiving an eighth instruction sent by the network equipment through the second cell or the third relay terminal, wherein the eighth instruction is sent when the network equipment determines that the connection reestablishment between the network equipment and the first relay terminal and the remote terminal is successful;

and maintaining a connection with the remote terminal according to the eighth indication.

In the above embodiment, after the network device determines that the connection reestablishment of the remote terminal is successful, the network device may send an eighth indication to the first relay terminal, and the first relay terminal may keep connection with the remote terminal according to the eighth indication, so that the remote terminal may communicate with the network device through the first relay terminal, and resume the service of the remote terminal in time, thereby improving the service quality of the remote terminal.

determining that the connection reestablishment of the first relay terminal is successful;

And sending a third indication to the remote terminal.

With reference to some embodiments of the second aspect, in some embodiments, determining that connection reestablishment of the first relay terminal fails;

and sending a fifth instruction to the remote terminal, wherein the fifth instruction is used for instructing the remote terminal to carry out connection reestablishment.

With reference to some embodiments of the second aspect, in some embodiments, the determining that the connection re-establishment of the first relay terminal fails includes at least one of:

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 times out, the second timer being started when a first connection reestablishment request is sent to the network equipment;

and receiving a ninth indication sent by the network equipment, wherein the ninth indication is sent by the network equipment when determining that the connection reestablishment of the remote terminal fails.

In the above embodiment, the first relay terminal may determine whether to reconnect the connection failure in various manners, so as to improve reliability of the determination.

With reference to some embodiments of the second aspect, in some embodiments, the fifth indication includes failure information of a connection re-establishment failure of the first relay terminal.

In the above embodiment, the first relay terminal may send the failure information of the connection reestablishment failure to the remote terminal, so that the remote terminal further makes a connection reestablishment decision according to the failure information, thereby improving the flexibility of connection reestablishment.

With reference to some embodiments of the second aspect, in some embodiments, the sixth indication includes a terminal identification of the remote terminal.

In the above embodiment, the first relay terminal may instruct the network device to reestablish connection with the remote terminal through the terminal identifier of the remote terminal, so that a flow for indicating to reestablish connection is simplified, and efficiency of reestablishing connection is improved.

With reference to some embodiments of the second aspect, in some embodiments, the seventh indication includes a terminal identification of the remote terminal.

In the above embodiment, the network device may instruct the first relay terminal to maintain connection with the remote terminal through the terminal identifier of the remote terminal, so as to simplify a procedure of indicating connection maintenance and improve connection reestablishment efficiency.

In a third aspect, an embodiment of the present disclosure provides a connection establishment method, where the method includes:

With reference to some embodiments of the third aspect, in some embodiments, the method further includes:

and sending a seventh instruction to the first relay terminal, wherein the seventh instruction is used for indicating that the first relay terminal maintains the connection with the remote terminal.

receiving a sixth instruction sent by the first relay terminal;

and reestablishing a connection with the remote terminal according to the sixth indication.

Receiving a first connection reestablishment request sent by the first relay terminal;

and reestablishing the connection with the first relay terminal according to the first connection reestablishment request.

determining that connection reestablishment with the first relay terminal and the remote terminal is successful;

and sending an eighth instruction to the first relay terminal, wherein the eighth instruction is used for indicating that the first relay terminal maintains the connection with the remote terminal.

determining connection reestablishment failure of the remote terminal;

and sending a ninth instruction to the first relay terminal, wherein the ninth instruction is used for instructing the first relay terminal to send a fifth instruction to the remote terminal, and the fifth instruction is used for instructing the remote terminal to carry out connection reestablishment.

and sending a fourth instruction to the remote terminal, wherein the fourth instruction is used for carrying out radio bearer transmission by the remote terminal.

In a fourth aspect, an embodiment of the present disclosure proposes a connection establishment method, the method including:

the first relay terminal determines connection failure;

In a fifth aspect, embodiments of the present disclosure provide a remote terminal that may include at least one of a transceiver module, a processing module; wherein the remote terminal may be adapted to perform the alternative implementation of the first aspect.

In a sixth aspect, embodiments of the present disclosure propose 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 adapted to perform the alternative implementation manner of the second aspect.

In a seventh aspect, embodiments of the present disclosure provide a network device that may include a transceiver module; wherein the network device may be adapted to perform the optional implementation of the third aspect.

In an eighth aspect, embodiments of the present disclosure provide a remote terminal, which may include: one or more processors; wherein the remote terminal may be adapted to perform the alternative implementation of the first aspect.

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 adapted to perform the alternative implementation manner of the second aspect.

In a tenth aspect, embodiments of the present disclosure provide a network device, which may include: one or more processors; wherein the network device may be adapted to perform the optional implementation of the third aspect.

In an eleventh aspect, embodiments of the present disclosure provide a communication system, which may include: the system comprises a remote terminal, a first relay terminal and network equipment; wherein the remote terminal is configured to perform the method as described in the alternative implementation of the first aspect, the first relay terminal is configured to perform the method as described in the alternative implementation of the second aspect, and the network device is configured to perform the method as described in the alternative implementation of the third aspect.

In a twelfth aspect, embodiments of the present disclosure provide a storage medium storing instructions that, when executed on a communication device, cause the communication device to perform a method as described in the alternative implementation of the first aspect or the second aspect or the third aspect.

In a thirteenth aspect, embodiments of the present disclosure propose a program product which, when executed by a communication device, causes the communication device to perform a method as described in the alternative implementation of the first aspect or the second aspect or the third aspect.

In a fourteenth aspect, embodiments of the present disclosure propose a computer program which, when run on a computer, causes the computer to carry out the method as described in the alternative implementation of the first aspect or the second aspect or the third aspect.

In a fifteenth aspect, embodiments of the present disclosure provide a chip or chip system. The chip or chip system comprises processing circuitry configured to perform a method as described in an alternative implementation of the first aspect or the second aspect or the third aspect.

It will be appreciated that the above-described remote terminal, first relay terminal, network device, communication system, storage medium, program product, computer program, chip or chip system may be used to perform the methods set forth in the embodiments of the present disclosure. Therefore, the advantages achieved by the method can be referred to as the advantages of the corresponding method, and will not be described herein.

The embodiment of the disclosure provides a connection establishment method, device and storage medium. In some embodiments, the terms of connection establishment method and information processing method, communication method, etc. may be interchanged; the terms of connection establishment means and information processing means, communication devices, etc. may be interchanged; the terms information handling system, communication system, etc. may be interchangeable.

The embodiments of the present disclosure are not intended to be exhaustive, but rather are exemplary of some embodiments and are not intended to limit the scope of the disclosure. In the case of no contradiction, each step in a certain embodiment may be implemented as an independent embodiment, and the steps may be arbitrarily combined, for example, a scheme in which part of the steps are removed in a certain embodiment may also be implemented as an independent embodiment, the order of the steps in a certain embodiment may be arbitrarily exchanged, and further, alternative implementations in a certain embodiment may be arbitrarily combined; furthermore, various embodiments may be arbitrarily combined, for example, some or all steps of different embodiments may be arbitrarily combined, and an embodiment may be arbitrarily combined with alternative implementations of other embodiments.

In the various embodiments of the disclosure, terms and/or descriptions of the various embodiments are consistent throughout the various embodiments and may be referenced to each other in the absence of any particular explanation or logic conflict, and features from different embodiments may be combined to form new embodiments in accordance with their inherent logic relationships.

The terminology used in the embodiments of the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure.

In the presently disclosed embodiments, elements that are referred to in the singular, such as "a," "an," "the," "said," etc., may mean "one and only one," or "one or more," "at least one," etc., unless otherwise indicated. For example, where an article (article) is used in translation, such as "a," "an," "the," etc., in english, a noun following the article may be understood as a singular expression or as a plural expression.

In the presently disclosed embodiments, "plurality" refers to two or more.

In some embodiments, terms such as "multiple of," at least one of, and one or more of may be interchanged.

In some embodiments, "A, B at least one of", "a and/or B", "in one case a, in another case B", "in response to one case a", "in response to another case B", and the like, may include the following technical solutions according to circumstances: in some embodiments a (a is performed independently of B); b (B is performed independently of a) in some embodiments; in some embodiments, execution is selected from a and B (a and B are selectively executed); in some embodiments a and B (both a and B are performed). Similar to that described above when there are more branches such as A, B, C.

In some embodiments, the description modes such as "a or B" may include the following technical schemes according to circumstances: in some embodiments a (a is performed independently of B); b (B is performed independently of a) in some embodiments; in some embodiments execution is selected from a and B (a and B are selectively executed). Similar to that described above when there are more branches such as A, B, C.

The prefix words "first", "second", etc. in the embodiments of the present disclosure are only for distinguishing different description objects, and do not limit the location, order, priority, number, content, etc. of the description objects, and the statement of the description object refers to the claims or the description of the embodiment context, and should not constitute unnecessary limitations due to the use of the prefix words. For example, if the description object is a "field", the ordinal words before the "field" in the "first field" and the "second field" do not limit the position or the order between the "fields", and the "first" and the "second" do not limit whether the "fields" modified by the "first" and the "second" are in the same message or not. For another example, describing an object as "level", ordinal words preceding "level" in "first level" and "second level" do not limit priority between "levels". As another example, the number of descriptive objects is not limited by ordinal words, and may be one or more, taking "first device" as an example, where the number of "devices" may be one or more. Furthermore, objects modified by different prefix words may be the same or different, e.g., the description object is "a device", then "a first device" and "a second device" may be the same device or different devices, and the types may be the same or different; for another example, the description object is "information", and the "first information" and the "second information" may be the same information or different information, and the contents thereof may be the same or different.

In some embodiments, "comprising a", "containing a", "for indicating a", "carrying a", may be interpreted as carrying a directly, or as indicating a indirectly.

In some embodiments, terms "responsive to … …", "responsive to determination … …", "in the case of … …", "at … …", "when … …", "if … …", "if … …", and the like may be interchanged.

In some embodiments, terms "greater than", "greater than or equal to", "not less than", "more than or equal to", "not less than", "above" and the like may be interchanged, and terms "less than", "less than or equal to", "not greater than", "less than or equal to", "not more than", "below", "lower than or equal to", "no higher than", "below" and the like may be interchanged.

In some embodiments, the apparatuses and devices may be interpreted as entities, or may be interpreted as virtual, and the names thereof are not limited to those described in the embodiments, and may also be interpreted as "device (apparatus)", "device)", "circuit", "network element", "node", "function", "unit", "component (section)", "system", "network", "chip system", "entity", "body", and the like in some cases.

In some embodiments, a "network" may be interpreted as an apparatus comprised in the network, e.g. an access network device, a core network device, etc.

In some embodiments, the "Access network Device (Access Network Device, AN Device)" may also be referred to as a "radio Access network Device (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 referred to as a "Node)", "Access Point (Access Point)", "Transmission Point (Transmission Point, TP)", "Reception Point (RP)", "Transmission and/or Reception Point (Transmission/Reception Point), TRP)", "Panel", "Antenna Array", "Cell", "Macro Cell", "Small Cell", "Femto Cell", "Pico Cell", "Sector", "Cell Group", "serving Cell", "Carrier", "component Carrier (Component Carrier)", bandwidth Part (BWP) ", etc.

In some embodiments, a "Terminal" or "Terminal Device" may be referred to as a "User Equipment" (UE), a "User Terminal" (UE), a "Mobile Station (MS), a" Mobile Terminal (MT), a Subscriber Station (Subscriber Station), a Mobile Unit (Mobile Unit), a Subscriber Unit (subscore Unit), a Wireless Unit (Wireless Unit), a Remote Unit (Remote Unit), a Mobile Device (Mobile Device), a Wireless Device (Wireless Device), a Wireless communication Device (Wireless Communication Device), a Remote Device (Remote Device), a Mobile Subscriber Station (Mobile Subscriber Station), an Access Terminal (Access Terminal), a Mobile Terminal (Mobile Terminal), a Wireless Terminal (Wireless Terminal), a Remote Terminal (Remote Terminal), a handheld Device (Handset), a User Agent (User Agent), a Client (Client), and the like.

In some embodiments, the acquisition of data, information, etc. may comply with laws and regulations of the country of locale.

In some embodiments, data, information, etc. may be obtained after user consent is obtained.

Furthermore, each element, each row, or each column in the tables of the embodiments of the present disclosure may be implemented as a separate embodiment, and any combination of elements, any rows, or any columns may also be implemented as a separate embodiment.

Fig. 1A is a schematic architecture diagram of a communication system shown in accordance with an embodiment of the present disclosure. As shown in fig. 1A, the communication system 100 includes a Terminal Device 150 and a network Device 160.

In some embodiments, the terminal device 150 includes at least one of a mobile phone (mobile phone), a wearable device, an internet of things device, a communication enabled car, a smart car, a tablet (Pad), a wireless transceiver enabled computer, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal device in industrial control (industrial control), a wireless terminal device in unmanned (self-driving), a wireless terminal device in teleoperation (remote medical surgery), a wireless terminal device in smart grid (smart grid), a wireless terminal device in transportation security (transportation safety), a wireless terminal device in smart city (smart city), a wireless terminal device in smart home (smart home), for example, but is not limited thereto.

In some embodiments, the network device 160 may comprise at least one of an access network device, a core network device.

In some embodiments, the access network device may be a node or device that accesses a terminal to a wireless network, and the access network device may include at least one of an evolved NodeB (eNB), a next generation evolved NodeB (next generation eNB, ng-eNB), a next generation NodeB (next generation NodeB, gNB), a NodeB (node B, NB), a Home NodeB (HNB), a home NodeB (home evolved nodeB, heNB), a wireless backhaul device, a radio network controller (radio network controller, RNC), a base station controller (base station controller, BSC), a base transceiver station (base transceiver station, BTS), a baseband 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, an access node in a Wi-Fi system, but is not limited thereto.

In some embodiments, the technical solutions of the present disclosure may be applied to an Open RAN architecture, where an access network device or an interface in an access network device according to the embodiments of the present disclosure may become an internal interface of the Open RAN, and flow and information interaction between these internal interfaces may be implemented by using software or a program.

In some embodiments, the access network device may be composed of a Central Unit (CU) and a Distributed Unit (DU), where the CU may also be referred to as a control unit (control unit), and the structure of the CU-DU may be used to split the protocol layers of the access network device, where functions of part of the protocol layers are centrally controlled by the CU, and functions of the rest of all the protocol layers are distributed in the DU, and the DU is centrally controlled by the CU, but is not limited thereto.

In some embodiments, the core network device may be one device, or may be multiple devices or groups of devices. The core network may include at least one of an evolved packet core (Evolved Packet Core, EPC), a 5G core network (5G Core Network,5GCN), a next generation core (Next Generation Core, NGC).

It may be understood that, the communication system described in the embodiments of the present disclosure is for more clearly describing the technical solutions of the embodiments of the present disclosure, and is not limited to the technical solutions provided in the embodiments of the present disclosure, and those skilled in the art can know that, with the evolution of the system architecture and the appearance of new service scenarios, the technical solutions provided in the embodiments of the present disclosure are applicable to similar technical problems.

The embodiments of the present disclosure described below may be applied to the communication system 100 shown in fig. 1A, or a part of the main body, but are not limited thereto. The respective bodies shown in fig. 1A are examples, and the communication system may include all or part of the bodies in fig. 1A, or may include other bodies than fig. 1A, and the number and form of the respective bodies may be arbitrary, and the respective bodies may be physical or virtual, and the connection relationship between the respective bodies is examples, and the respective bodies may not be connected or may be connected, and the connection may be arbitrary, direct connection or indirect connection, or wired connection or wireless connection.

The embodiments of the present disclosure may be applied to long term evolution (Long Term Evolution, LTE), LTE-Advanced (LTE-a), LTE-Beyond (LTE-B), upper 3G, IMT-Advanced, fourth generation mobile communication system (4th generation mobile communication system,4G)), fifth generation mobile communication system (5th generation mobile communication system,5G), 5G New air (New Radio, NR), future wireless access (Future Radio Access, FRA), new wireless access technology (New-Radio Access Technology, RAT), new wireless (New Radio, NR), new wireless access (New Radio access, NX), future generation wireless access (Future generation Radio access, FX), global System for Mobile communications (GSM (registered trademark)), CDMA2000, ultra mobile broadband (Ultra Mobile Broadband, UMB), IEEE 802.11 (registered trademark), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, ultra WideBand (Ultra-wide bandwidth, UWB), bluetooth (Bluetooth) mobile communication network (Public Land Mobile Network, PLMN, device-D-Device, device-M, device-M, internet of things system, internet of things (internet of things), machine-2, device-M, device-M, internet of things (internet of things), system (internet of things), internet of things 2, device (internet of things), machine (internet of things), etc. In addition, a plurality of system combinations (e.g., LTE or a combination of LTE-a and 5G, etc.) may be applied.

In some embodiments of the present disclosure, as shown in fig. 1A, the terminal device 150 may include a remote terminal 151 and a first relay terminal 153. Wherein: the first relay terminal 153 may be used to provide a relay function for a remote terminal to communicate with a network device, in which case the remote terminal 151 may be referred to as a remote UE (remote UE), and the first relay terminal 153 providing the relay function may be referred to as a relay UE (relay UE). The first relay terminal 153 and the network device 160 may communicate via a UU interface, the remote terminal 151 and the first relay terminal 153 may communicate via a direct link, and an interface where the remote terminal 151 and the first relay terminal 153 communicate may be referred to as a PC5 interface or a direct communication interface. The manner in which the direct link communication between the remote terminal 151 and the first relay terminal 153 is performed may include any one or more of unicast, multicast, or broadcast.

It should be noted that, in fig. 1A, the terminal device 150 may further include a second terminal, a third terminal, or more terminals; the remote terminal may be one or more, and the first relay terminal may be one or more, which is not limited in this disclosure.

Fig. 1B is a schematic diagram illustrating a traffic data transmission according to an embodiment of the present disclosure. As shown in fig. 1B, the network device 160 may transmit traffic data through a packet data convergence protocol (Packet Data Convergence Protocol, PDCP) entity and a radio link control (Radio Link Control, RLC) entity; the first relay terminal 153 receives the service data through the RLC entity and transmits the service data through the SL-RLC entity; the remote terminal 151 may receive the service data through a direct link radio link control (SL-RLC) entity and a PDCP entity. In this way, the first relay terminal 153 can implement forwarding of the service data through the RLC entity and the SL-RLC entity without the PDCP entity.

In some embodiments, the network device 160 may further include a medium access control MAC (Medium Access Control) entity and a Physical layer PHY (Physical) entity, the remote terminal 151 may further include a direct link medium access control SL-MAC entity and a direct link Physical layer SL-PHY entity, and similarly, the first relay terminal 153 may also include a MAC entity, a PHY entity, a SL-MAC entity, and a SL-PHY entity.

Note that, for the relevant descriptions of PDCP, RLC, MAC and PHY, reference may be made to descriptions in the 3GPP protocol, and details are not repeated here.

In some other embodiments, the UE initiates the RRC connection reestablishment procedure when a connection failure occurs in the UE in the connected state. Connection failures may include radio link failures, handover failures, and the like. If the UE selects a suitable cell or relays the UE, the UE sends an RRC reestablishment request message (rrcreestablischentrequest) and starts a T301 timer, and if an RRC reestablishment message (rrcreestablichent) is received, the T301 timer is stopped. If the T301 timer expires, it indicates that the RRC reestablishment fails.

In other embodiments, in order to support direct communication between UEs, a direct link (sidelink) communication mode is introduced, and an interface between UEs is PC-5. According to the corresponding relation between the sending UE and the receiving UE, three transmission modes are supported on the sidelink: unicast, multicast and broadcast. After the two UEs establish a unicast connection, one UE may send a PC5-RRC message to the other UE. One UE may not directly connect to the base station but communicate with the base station through a relay of another UE, where a UE that is not connected to the base station is called a remote UE (remote UE), a UE that provides a relay function is called a relay UE (relay UE), and the remote UE and the relay UE communicate through a 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, so that the coverage of the network can be enlarged.

In some other embodiments, when the relay UE fails to connect, a notification message (notification service message) is sent to the connected remote UE through the sidelink, and after the remote UE receives the notification message, the remote UE in a connected state may trigger RRC connection reestablishment, and the relay UE may trigger RRC connection reestablishment. In this way, both the remote UE and the relay UE send RRC connection reestablishment request messages to the network device, resulting in relatively large signaling overhead.

Fig. 2 is an interactive schematic diagram illustrating a connection establishment method according to an embodiment of the present disclosure. The method may be performed by the communication system described above. As shown in fig. 2, the method may include:

step S201, the network device sends first configuration information to the remote terminal.

The first configuration information may indicate whether the remote terminal maintains a connection with the first relay terminal when the connection of the first relay terminal fails.

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

In some embodiments, the name of the first configuration information is not limited, and may be, for example, "indication information to be connected to the first relay terminal is maintained", "indication information to be connected to the first relay terminal is not maintained", "indication information to be connected to the first relay terminal is released", or the like.

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.

In some embodiments, the network device determines that the remote terminal remains connected to the first relay terminal when the first relay terminal fails to connect, and sends the first configuration information to the remote terminal.

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

In some embodiments, the first configuration information sent by the network device to the remote terminal may be a first specific value, which may be used to indicate that the remote terminal maintains a connection with the first relay terminal when the first relay terminal fails.

In some embodiments, the first configuration information sent by the network device to the remote terminal may be a second specific value, which may be used to indicate that the remote terminal does not maintain a connection with the first relay terminal when the first relay terminal fails.

The first specific value is different from a second specific value, for example, the first specific value is 1 and the second specific value is 0; alternatively, the first specific value is 0 and the second specific value is 1.

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

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.

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

In some embodiments, after receiving the first configuration information sent by the network device, the remote terminal may parse the first configuration information, and store the parsing result of the first configuration information, where the parsing result may be to maintain a connection with the first relay terminal when the connection with the first relay terminal fails, or release a connection with the first relay terminal when the connection with the first relay terminal fails.

In some embodiments, the network device may send the first configuration information to the remote terminal through a downlink channel, which may include at least one of a physical downlink control channel (Physical Downlink Control Channel, PDCCH), a physical downlink shared channel (Physical Downlink Shared Channel, PDSCH), or other channels specified by the protocol.

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

In some embodiments, the seventh indication may be used to indicate that the first relay terminal remains connected to the remote terminal.

In some embodiments, the name of the seventh indication is not limited, and may be, for example, "keep far-end connection indication", "keep connection indication", "do not release far-end connection indication", or the like.

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

Step S202, the first relay terminal determines that the connection fails.

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

In other embodiments, the connection failure may be a radio link failure.

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

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

In some embodiments, the first relay terminal determines that the connection failed, indicating that the first relay terminal is unable to communicate with the network device.

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

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

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

Step S203, the first relay terminal sends a first indication to the remote terminal.

Wherein the first indication may be used for the remote terminal to determine whether to maintain a connection with the first relay terminal.

In some embodiments, the name of the first indication is not limited, and may be, for example, "connection failure indication", "connection status indication", or the like.

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

In some embodiments, the remote terminal comprises a terminal that remains connected to the first relay terminal.

In some embodiments, the first relay terminal determines that the connection failed, may determine a remote terminal currently maintaining the connection with the first relay terminal, and send the first indication to the remote terminal maintaining the connection.

In some embodiments, the remote terminal may comprise at least one terminal.

Step S204, the remote terminal determines whether to keep the connection with the first relay terminal according to the first configuration information, if so, steps S205-S215 are executed, and if not, step S216 is executed.

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

In some embodiments, the first configuration information sent by the network device indicates that the connection with the first relay terminal is maintained when the connection with the first relay terminal fails, and the remote terminal receives the first indication sent by the first relay terminal and determines to maintain the connection with the first relay terminal.

In some embodiments, in a case where the first configuration information sent by the network device indicates that the connection with the first relay terminal is not maintained when the connection with the first relay terminal fails, the remote terminal receives the first indication sent by the first relay terminal, and determines that the connection with the first relay terminal is not maintained.

In some embodiments, in a case where 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 that the connection with the first relay terminal is not maintained.

In some embodiments, in a case where 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 a connection with the first relay terminal.

In some embodiments, in a case where the first configuration information sent by the network device is a second specific value, 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.

In some embodiments, the connection with the first relay terminal is not maintained, and may also be referred to as releasing the connection with the first relay terminal.

Step S205, the remote terminal sends a second instruction to the first relay terminal.

Wherein the second indication may be used to indicate that the first relay terminal remains connected to the remote terminal.

In some embodiments, the name of the second indication is not limited, and may be, for example, "keep connection indication", "connect confirmation indication", "connect indication", or the like.

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

In some embodiments, the first relay terminal is a relay terminal that remains connected to the remote terminal.

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

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

In some embodiments, the second indication sent by the remote terminal to the first relay terminal may be a first specific value, which may be used to indicate that the first relay terminal remains connected to the remote terminal.

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

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

In some embodiments, the remote terminal determines to maintain a connection with the first relay terminal, a default configuration of radio signaling bearers (signalling radio bearer, SRBs) may be used.

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

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

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

In some embodiments, the duration of the first timer may be protocol specified.

In some embodiments, the duration of the first timer may be preconfigured by the network device.

Step S206, the first relay terminal keeps the connection with the remote terminal according to the second instruction.

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

In some embodiments, the first relay terminal receives the second indication sent by the remote terminal without disconnecting the connection with the remote terminal.

In some embodiments, the first relay terminal receives the second indication sent by the remote terminal without releasing the connection with the remote terminal.

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

In some embodiments, the second indication received by the first relay terminal is a first specific value, maintaining a connection with the remote terminal.

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

In some embodiments, the first relay terminal receives a seventh indication sent by the network device and remains connected to the remote terminal.

In some embodiments, the first relay terminal receives the seventh indication sent by the network device, determines that the first relay terminal fails to connect, and maintains a connection with the remote terminal.

In some embodiments, the seventh indication may comprise a terminal identification of the remote terminal.

For example, the first relay terminal may determine the remote terminal according to the terminal identification, and maintain connection with the determined remote terminal.

In step S207, the first relay terminal sends a sixth instruction to the network device through the second cell or the third relay terminal that satisfies the second preset channel quality condition according to the second instruction.

Wherein the sixth indication may be used to indicate reestablishment of the connection with the remote terminal.

In some embodiments, the network device may receive the sixth indication, reestablishing the connection between the network device and the remote terminal.

In some embodiments, the name of the sixth indication is not limited, and may be, for example, "connection request", "establish connection request", "reestablish connection request", etc.

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

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

In some embodiments, the sixth indication may include terminal identifications of a plurality of remote terminals.

For example, the sixth indication may include terminal identification a of remote terminal a and terminal identification B of remote terminal B.

For another example, the network device may determine the remote terminal based on the terminal identification and reestablish the connection of the determined remote terminal.

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.

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

In some embodiments, the cell that satisfies the second cell channel quality condition is a second cell.

In some embodiments, the relay terminal that satisfies the second terminal channel quality condition is a third relay terminal.

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.

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 both relay and direct links.

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.

In some embodiments, the cell channel quality may be a reference signal received power (Reference Signal Received Power, RSRP) of the cell.

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

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

In some embodiments, the first relay terminal determines to maintain the connection with the remote terminal according to the second indication, and may determine a second cell satisfying the second preset channel quality condition from the plurality of cells, and send the sixth indication to the network device through the second cell.

In some embodiments, the first relay terminal determines to maintain the connection with the remote terminal according to the second indication, and may determine a second cell that satisfies the second preset channel quality condition and supports the relay and direct link from the plurality of cells, and send the sixth indication to the network device through the second cell.

In some embodiments, the first relay terminal determines to maintain the connection with the remote terminal according to the second indication, and may determine a third relay terminal satisfying the second preset channel quality condition from the plurality of relay terminals, and send the sixth indication to the network device through the third relay terminal.

In some embodiments, the first relay terminal determines, according to the second indication, to maintain the connection with the remote terminal, and may determine a second cell or a third relay terminal that satisfies a second preset channel quality condition from the plurality of cells and the plurality of relay terminals, and if it is determined that the second cell satisfies the second preset channel quality condition, send the sixth indication to the network device through the second cell; and if the third relay terminal meets the second preset channel quality condition, sending the sixth indication to the network equipment through the third relay terminal.

In some embodiments, the first relay terminal determines to maintain the connection with the remote terminal according to the second indication, and may first determine whether a second cell satisfying the second preset channel quality condition exists from the plurality of cells, and if the second cell satisfying the second preset channel quality condition exists, send the sixth indication to the network device through the second cell; if the second cell meeting the second preset channel quality condition does not exist, determining whether a third relay terminal meeting the second preset channel quality condition exists from the plurality of relay terminals, and if the third relay terminal meeting the second preset channel quality condition exists, sending the sixth instruction to the network equipment through the third relay terminal; and if the third relay terminal meeting the second preset channel quality condition does not exist, taking the relay terminal with the best channel quality among the plurality of relay terminals as the third relay terminal, and sending the sixth instruction to the network equipment through the third relay terminal.

In other embodiments, the first relay terminal determines to maintain the connection with the remote terminal according to the second indication, and may first determine whether a third relay terminal satisfying the second preset channel quality condition exists from the plurality of relay terminals, and if the third relay terminal satisfying the second preset channel quality condition exists, send the sixth indication to the network device through the third relay terminal; if the third relay terminal meeting the second preset channel quality condition does not exist, determining whether a second cell meeting the second preset channel quality condition exists from the cells, and if the second cell meeting the second preset channel quality condition exists, sending the sixth indication to the network equipment through the second cell; and if the second cell meeting the second preset channel quality condition does not exist, taking the cell with the best channel quality in the cells as the second cell, and sending the sixth indication to the network equipment through the second cell.

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

It should be noted that, the implementation manner of the first relay terminal sending the sixth instruction to the network device according to the seventh instruction may refer to the implementation manner of the first relay terminal sending the sixth instruction to the network device according to the second instruction, which is not described herein.

And step S208, the network equipment reestablishes connection with the remote terminal according to the sixth instruction.

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.

It should be noted that, the manner of reestablishing the connection of the remote terminal may refer to the description related to the 3GPP protocol, which is not described herein.

In 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 satisfies the second preset channel quality condition.

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

In some embodiments, the name of the first connection reestablishment request is not limited, and may be, for example, "RRC connection reestablishment request", "RRC connection request", "connection request", and so on.

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

In some embodiments, the first relay terminal determines that the connection fails, determines a second cell or a third relay terminal that satisfies 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.

The method for determining the second cell or the third relay terminal satisfying the second preset channel quality condition in step S209 may refer to an alternative implementation manner of step S208, which is not described herein.

In some embodiments, the first relay terminal sends a first connection reestablishment request to the network device, starting a second timer.

In some embodiments, the duration of the second timer may be protocol specified.

In some embodiments, the duration of the second timer may be preconfigured by the network device.

Step S210, the network equipment sends a fourth indication to the far-end terminal.

Wherein the fourth indication may be for radio bearer transmission by the remote terminal.

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

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

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.

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

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.

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

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

Step S211, the remote terminal carries out radio bearer transmission according to the fourth instruction.

In some embodiments, a Radio Bearer (RB) transmission may be a channel for data transmission, e.g., the Radio Bearer transmission may include PDCP, RLC.

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.

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.

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

For example, the remote terminal may receive a fourth indication sent by the network device, update the key, and resume all radio bearer transmissions.

Step S212, the network equipment reestablishes the connection with the first relay terminal according to the first connection reestablishment request.

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

It should be noted that, the manner of reestablishing the connection of the first relay terminal may refer to the description related to the 3GPP protocol, which is not described herein again.

Step S213, the network equipment determines that the connection reestablishment between the first relay terminal and the remote terminal is successful, and sends an eighth instruction to the first relay terminal.

Wherein the eighth indication may be used to indicate that the first relay terminal remains connected to the remote terminal.

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

In some embodiments, the name of the eighth indication is not limited, and may be, for example, "reestablish complete message", "connect reestablish success indication", "connect success indication", or the like.

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

In some embodiments, the eighth indication may be carried in an RRC reestablishment message or an RRC reconfiguration message.

In some embodiments, the network device determines that the connection reestablishment with the first relay terminal was successful, and determines that the connection reestablishment with the remote terminal was successful, and sends the eighth indication to the first relay terminal.

In some embodiments, the network device determines that the connection reestablishment with the first relay terminal was successful, determines that the connection reestablishment with the remote terminal failed, and may not send the eighth indication to the first relay terminal.

In some embodiments, the network device determines that connection reestablishment with the first relay terminal failed and, with determining that the remote terminal failed, may not send the eighth indication to the first relay terminal.

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

In some embodiments, the ninth indication may be used to instruct the first relay terminal to send a fifth indication to the remote terminal, which may be used to instruct the remote terminal to perform connection re-establishment.

In some embodiments, the name of the ninth indication is not limited, and may be, for example, "connection failure indication", "connection reestablishment failure indication", "connection release indication", or the like.

In some embodiments, the ninth indication may carry a terminal identity of the remote terminal.

In some embodiments, the ninth indication may include a terminal identification of the remote terminal for which connection re-establishment was successful.

For example, taking the above sixth indication as an example, the terminal identifier a of the remote terminal a and the terminal identifier B of the remote terminal B, if the network device determines that the connection reestablishment of the remote terminal a fails, the ninth indication may include the terminal identifier a; if the network device determines that the remote terminal B connection reestablishment fails, the ninth indication may include a terminal identity B.

In some embodiments, the first relay terminal may send the fifth indication to the remote terminal that the connection re-establishment failed.

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

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

For example, if the ninth indication includes the terminal identifier a, the first relay terminal may release the connection with the remote terminal a; if the ninth indication includes the terminal identification B, the first relay terminal may release the connection with the remote terminal B.

In step S214, the first relay terminal maintains connection with the remote terminal according to the eighth instruction.

In some embodiments, the first relay terminal may receive an eighth indication sent by the network device, maintaining a connection with the remote terminal.

In some embodiments, the first relay terminal may receive an eighth indication sent by the network device without disconnecting from the remote terminal.

In some embodiments, the first relay terminal may receive an eighth indication sent by the network device without releasing the connection with the remote terminal.

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

Wherein the tenth indication is used for indicating that the remote terminal remains connected with the first relay terminal.

In some embodiments, the name of the tenth indication is not limited, and may be, for example, "indication information to keep connection with the first relay terminal", "keep connection indication", or the like.

In some embodiments, the remote terminal may receive a tenth indication sent by the first relay terminal, and maintain a connection with the first relay terminal.

Step S215, the first relay terminal determines that connection reestablishment is successful, and sends a third indication to the remote terminal.

In some embodiments, the name of the third indication is not limited, and may be, for example, "connection success indication", "connection completion indication", "connection reestablishment completion indication", and the like.

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

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

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

In some embodiments, the remote terminal may receive the third indication, determining that the information can be sent to the network device through the first relay terminal.

In some embodiments, the remote terminal may receive the third indication, determining that information sent by the network device can be received by the first relay terminal.

In some embodiments, the first relay terminal determines that the connection re-establishment failed and sends a fifth indication to the remote terminal.

In some embodiments, the fifth indication may be used to instruct the remote terminal to perform connection re-establishment.

In some embodiments, the name of the fifth indication is not limited, and may be, for example, "connection failure indication", "connection reestablishment failure indication", "connection release indication", and the like.

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

In some embodiments, the first relay terminal determining that the connection re-establishment failed includes at least one of: 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 times out; a ninth indication sent by the network device is received.

In some embodiments, the second timer is started when the first connection re-establishment request is sent to the network device.

In some embodiments, after determining the second cell and sending the first connection reestablishment request to the second cell, the first relay terminal determines that the connection reestablishment of the first relay terminal fails if it is determined that the second cell does not support the relay operation.

In some embodiments, after determining the second cell and sending the first connection reestablishment request to the second cell, the first relay terminal determines that the connection reestablishment of the first relay terminal fails if it is determined that the second cell does not support the direct link.

In some embodiments, after the first relay terminal sends the 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 connection reestablishment of the first relay terminal fails.

In some embodiments, after the first relay terminal sends the 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 connection reestablishment of the first relay terminal fails.

In some embodiments, the fifth indication may include failure information when the first relay terminal determines that the connection re-establishment fails.

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

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

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

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

In some embodiments, the failure information may be a second timer timeout.

In some embodiments, the failure information may be a connection re-establishment failure of the remote terminal.

In some embodiments, the remote terminal receives the fifth indication and determines that the connection re-establishment of the first relay terminal fails.

In some embodiments, the remote terminal determines that the first timer has expired and determines that the connection re-establishment of the first relay terminal has failed.

In some embodiments, the first timer is started upon determining to maintain a connection with the first relay terminal.

In some embodiments, the remote terminal receives the fifth indication and determines that the first timer has expired, determining that the first relay terminal connection reestablishment failed.

In some embodiments, the remote terminal determines that connection reestablishment of the first relay terminal fails, and sends a second connection reestablishment request to the network device through the first cell or the second relay terminal satisfying the first preset channel quality condition.

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.

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

In some embodiments, the cell that satisfies the first cell channel quality condition is a first cell.

In some embodiments, the relay terminal that satisfies the first terminal channel quality condition is a second relay terminal.

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.

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 both relay and direct links.

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.

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

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

In some embodiments, the remote terminal determines that the connection reestablishment of the first relay terminal fails, and may determine a first cell that satisfies a first preset channel quality condition from a plurality of cells, and send the second connection reestablishment request to the network device through the first cell.

In some embodiments, the remote terminal determines that the connection reestablishment of the first relay terminal fails, and may determine, from a plurality of cells, a first cell that meets a first preset channel quality condition and supports the relay and the direct link, and send the second connection reestablishment request to the network device through the first cell.

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

In some embodiments, the remote terminal determines that connection reestablishment of the first relay terminal fails, may determine a first cell or a second relay terminal that satisfies a first preset channel quality condition from a plurality of cells and a plurality of relay terminals, and if it is determined that the first cell satisfies the first preset channel quality condition, send the second connection reestablishment request to the network device through the first cell; and if the condition that the first preset channel quality condition is met is determined to be the second relay terminal, sending the second connection reestablishment request to the network equipment through the second relay terminal.

In some embodiments, the remote terminal determines that the connection reestablishment of the first relay terminal fails, and may first determine whether a first cell satisfying a first preset channel quality condition exists from a plurality of cells, and if the first cell satisfying the first preset channel quality condition exists, send the second connection reestablishment request to the network device through the first cell; if the first cell meeting the first preset channel quality condition does not exist, determining whether a second relay terminal meeting the first preset channel quality condition exists from a plurality of relay terminals, and if the second relay terminal meeting the first preset channel quality condition exists, sending the second connection reestablishment request to the network equipment through the second relay terminal; and if the second relay terminal meeting the first preset channel quality condition does not exist, taking the relay terminal with the best channel quality of the plurality of relay terminals as the second relay terminal, and sending the second connection reestablishment request to the network equipment through the second relay terminal.

In other embodiments, the remote terminal determines that the connection reestablishment of the first relay terminal fails, may first determine whether a second relay terminal satisfying the first preset channel quality condition exists from the plurality of relay terminals, and if the second relay terminal satisfying the first preset channel quality condition exists, send the second connection reestablishment request to the network device through the second relay terminal; if the second relay terminal meeting the first preset channel quality condition does not exist, determining whether a first cell meeting the first preset channel quality condition exists in a plurality of cells, and if the first cell meeting the first preset channel quality condition exists, sending the second connection reestablishment request to the network equipment through the first cell; if the first cell meeting the first preset channel quality condition does not exist, taking the cell with the best channel quality in the cells as the first cell, and sending the second connection reestablishment request to the network equipment through the first cell.

S216, the remote terminal sends a second connection reestablishment request to the network equipment through the first cell or the second relay terminal meeting the first preset channel quality condition.

In some embodiments, the second connection reestablishment request is for instructing the network device to reestablish the connection with the remote terminal.

It should be noted that, in the implementation manner of sending the second connection reestablishment request to the network device in the step S216, reference may be made to the implementation manner 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 step S215, which is not described herein.

By adopting the method, when the first relay terminal determines that the connection fails, the remote terminal can select to keep the connection with the first relay terminal or release the connection with the first relay terminal, and when the remote terminal keeps the connection with the first relay terminal, the connection with the first relay terminal can be rebuilt together, so that signaling cost can be saved, and when the remote terminal releases the connection with the first relay terminal, the connection of the remote terminal can be rebuilt, and the flexibility of connection establishment is improved.

In some embodiments, the names of information and the like are not limited to the names described in the embodiments, and terms such as "information", "message", "signal", "signaling", "report", "configuration", "instruction", "command", "channel", "parameter", "field", "symbol", "codebook", "code word", "code point", "bit", "data", "program", "chip", and the like may be replaced with each other.

In some embodiments, terms of "physical downlink shared channel (physical downlink shared channel, PDSCH)", "DL data", etc. may be interchanged, and terms of "physical uplink shared channel (physical uplink shared channel, PUSCH)", "UL data", etc. may be interchanged.

In some embodiments, terms such as "time of day," "point of time," "time location," and the like may be interchanged, and terms such as "duration," "period," "time window," "time," and the like may be interchanged.

In some embodiments, "acquire," "obtain," "receive," "transmit," "bi-directional transmit," "send and/or receive" may be used interchangeably and may be interpreted as receiving from other principals, acquiring from protocols, acquiring from higher layers, processing itself, autonomous implementation, etc.

In some embodiments, terms such as "send," "transmit," "report," "send," "transmit," "bi-directional," "send and/or receive," and the like may be used interchangeably.

In some embodiments, terms such as "specific (specific)", "predetermined", "preset", "set", "indicated", "certain", "arbitrary", "first", and the like may be replaced with each other, and "specific a", "predetermined a", "preset a", "set a", "indicated a", "certain a", "arbitrary a", "first a" may be interpreted as a predetermined in a protocol or the like, may be interpreted as a obtained by setting, configuring, or indicating, or the like, may be interpreted as specific a, certain a, arbitrary a, or first a, or the like, but are not limited thereto.

In some embodiments, the determination or judgment may be performed by a value (0 or 1) expressed in 1 bit, may be performed by a true-false value (boolean) expressed in true (true) or false (false), or may be performed by a comparison of values (e.g., a comparison with a predetermined value), but is not limited thereto.

The method according to the embodiments of the present disclosure may include at least one of the above steps S201 to S216. For example, step S201 may be implemented as a separate embodiment, step s202+s203 may be implemented as a separate embodiment, step s205+s206 may be implemented as a separate embodiment, step s202+s203+s204+s205 may be implemented as a separate embodiment, and step s202+s203+s204+s215 may be implemented as a separate embodiment, but is not limited thereto.

In some embodiments, all of the steps S201 to S215 may be performed in an exchange order or simultaneously.

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

In fig. 2, all steps (steps S201 to S216) of maintaining connection with the first relay terminal and not maintaining connection with the first relay terminal are shown, and not all steps are executed in the embodiment, and some steps may be selected according to actual conditions.

In some embodiments, reference may be made to alternative implementations described before or after the description corresponding to fig. 2.

Fig. 3A is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure. As shown in fig. 3A, an embodiment of the present disclosure relates to a connection establishment method, which may be performed by a remote terminal, the method including:

step S3101, acquire first configuration information.

Alternative implementations of step S3101 may refer to alternative implementations of step S201 in fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

In some embodiments, the remote terminal may receive the first configuration information transmitted by the network device, but is not limited thereto, and the remote terminal may also receive the first configuration information transmitted by other bodies.

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

In some embodiments, the remote terminal may process to obtain the first configuration information.

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-mentioned function may be a default or default.

Step S3102, a first instruction is acquired.

Alternative implementations of step S3102 may refer to alternative implementations of step S203 in fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

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

In some embodiments, the remote terminal may process to obtain the first indication.

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-mentioned function may be a default or default.

Step S3103, determining 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, executing steps S3104 to S3107, and if it is determined to not maintain the connection with the first relay terminal, executing step S3108.

Alternative implementations of step S3103 may refer to alternative implementations of step S204 of fig. 2, and other relevant parts of the embodiment related to fig. 2, which are not described herein.

Step S3104, a second instruction is transmitted to the first relay terminal.

Alternative implementations of step S3104 may refer to alternative implementations of step S205 in fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

In some embodiments, the remote terminal may send the second indication to the first relay terminal, but is not limited thereto, and the remote terminal may also send the second indication to other subjects.

Alternatively, the second indication may be for the first relay terminal to maintain a connection with the remote terminal, e.g., the first relay terminal may receive the second indication, and maintain a connection with the remote terminal based on the second indication. Alternative implementations of the method may refer to alternative implementations of steps S206 to S208 in fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

Step S3105, a fourth instruction is acquired.

Alternative implementations of step S3105 may refer to alternative implementations of step S210 of fig. 2, and other relevant parts of the embodiment related to fig. 2, which are not described herein.

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.

In some embodiments, the remote terminal may process to obtain a fourth indication.

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-described function may be a default or default.

Step S3106, radio bearer transmission is performed according to the fourth instruction.

Alternative implementations of step S3106 may refer to alternative implementations of step S211 of fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

Step S3107, a third instruction is acquired.

Alternative implementations of step S3107 may refer to alternative implementations of step S215 of fig. 2, and other relevant parts of the embodiment related to fig. 2, which are not described herein.

In some embodiments, after the first relay terminal determines that the connection reestablishment is successful, the remote terminal may receive a third indication sent by the first relay terminal.

In some embodiments, the remote terminal may process to obtain a third indication.

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-mentioned function may be a default or default.

Step S3108, a second connection reestablishment request is sent to the network device.

Alternative implementations of step S3108 may refer to alternative implementations of step S216 of fig. 2, and other relevant parts of the embodiment related to fig. 2, which are not described herein.

In some embodiments, the remote terminal may send the second connection reestablishment request to the network device, but is not limited thereto, and the remote terminal may also send the second connection reestablishment request to other bodies.

Alternatively, the second connection reestablishment request may be used for connection reestablishment by the network device, for example, the network device may receive the second connection reestablishment request, and reestablish a connection with the remote terminal according to the second connection reestablishment request.

Methods according to embodiments of the present disclosure may include at least one of the above-described steps S3101 to S3108. For example, step S3101 may be implemented as a separate embodiment, step S3108 may be implemented as a separate embodiment, step S3102+ S3103 may be implemented as a separate embodiment, step S3105+ S3106 may be implemented as a separate embodiment, step S3102+ S3103+ S3104 may be implemented as a separate embodiment, and step S3102+ S3103+ S3104+ S3105 may be implemented as a separate embodiment, but is not limited thereto.

In some embodiments, steps S3101 to S3108 may be performed in an exchange order or simultaneously. For example, steps S3101, S3102 may be performed in exchange for one another or simultaneously.

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

In some embodiments, reference may be made to alternative implementations described before or after the description corresponding to fig. 3A.

Fig. 3B is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure. As shown in fig. 3B, an embodiment of the present disclosure relates to a connection establishment method, which may be performed by a remote terminal, the method including:

step S3201, a first instruction is acquired.

The optional implementation of this step S3201 may refer to the optional implementation of step S203 in fig. 2, the optional implementation of step S3102 in fig. 3A, and other relevant parts in the embodiments related to fig. 2 and 3A, which are not described herein.

Step S3202, determining to maintain connection with the first relay terminal.

The optional implementation of this step S3202 may refer to the optional implementation of step S204 in fig. 2, the optional implementation of step S3103 in fig. 3A, and other relevant parts in the embodiments related to fig. 2 and 3A, which are not described herein.

Step S3203, a second instruction is sent to the first relay terminal.

The optional implementation of this step S3203 may refer to the optional implementation of step S205 in fig. 2, the optional implementation of step S3104 in fig. 3A, and other relevant parts in the embodiments related to fig. 2 and 3A, which are not described herein.

Step S3204, a fourth instruction is acquired.

The optional implementation of this step S3204 may refer to the optional implementation of step S210 in fig. 2, the optional implementation of step S3105 in fig. 3A, and other relevant parts in the embodiments related to fig. 2 and 3A, which are not described herein.

Step S3205, performing radio bearer transmission according to the fourth instruction.

The optional implementation of this step S3205 may refer to the optional implementation of step S211 in fig. 2, the optional implementation of step S3106 in fig. 3A, and other relevant parts in the embodiments related to fig. 2 and 3A, which are not described herein.

In some embodiments, the above steps are optional steps.

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.

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.

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.

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.

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.

Fig. 3C is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure. As shown in fig. 3C, an embodiment of the present disclosure relates to a connection establishment method, which may be performed by a remote terminal, the method including:

step S3301, obtain the first instruction.

The optional implementation of this step S3301 may refer to the optional implementation of step S203 in fig. 2, the optional implementation of step S3102 in fig. 3A, and other relevant parts in the embodiments related to fig. 2 and 3A, which are not described herein.

Step S3302, determining to maintain connection with the first relay terminal.

The optional implementation of this step S3302 may refer to the optional implementation of step S204 in fig. 2, the optional implementation of step S3103 in fig. 3A, and other relevant parts in the embodiments related to fig. 2 and 3A, which are not described herein.

Step S3303, a second instruction is sent to the first relay terminal.

The optional implementation of this step S3303 may refer to the optional implementation of step S205 in fig. 2, the optional implementation of step S3104 in fig. 3A, and other relevant parts in the embodiments related to fig. 2 and 3A, which are not described herein.

In some embodiments, the above steps are optional steps.

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.

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.

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.

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.

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 as a new embodiment.

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 as a new embodiment.

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.

Fig. 3D is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure. As shown in fig. 3D, an embodiment of the present disclosure relates to a connection establishment method, which may be performed by a remote terminal, the method including:

step S3401, a first instruction is acquired.

The optional implementation of this step S3401 may refer to the optional implementation of step S203 in fig. 2, the optional implementation of step S3102 in fig. 3A, and other relevant parts in the embodiments related to fig. 2 and 3A, which are not described herein.

Step S3402, determining whether to maintain connection with the first relay terminal.

The optional implementation of this step S3402 may refer to the optional implementation of step S204 in fig. 2, the optional implementation of step S3103 in fig. 3A, and other relevant parts in the embodiments related to fig. 2 and 3A, which are not described herein.

In some embodiments, the embodiment shown in fig. 3D may also be combined with at least one of step S3101, step S3104, step S3105, step S3106, step S3107, step S3108 in the embodiment shown in fig. 3A as a new embodiment.

In some embodiments, the first indication is an indication sent when the first relay terminal determines that the connection failed.

In some embodiments, the determining whether to maintain a connection with the first relay terminal comprises:

it is determined to maintain a connection with the first relay terminal.

In some embodiments, the method further comprises:

receiving a fourth indication, wherein the fourth indication is sent by the network equipment after receiving a second connection reestablishment request sent by the first relay terminal;

and carrying out radio bearer transmission according to the fourth indication.

In some embodiments, the method further comprises:

In some embodiments, the determining that the connection re-establishment of the first relay terminal fails includes at least one of:

determining that connection with the first relay terminal is not maintained;

the method further comprises the steps of:

In some embodiments, the method further comprises:

Fig. 4A is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure. As shown in fig. 4A, an embodiment of the present disclosure relates to a connection establishment method, which may be performed by a first relay terminal, the method including:

step S4101, determining connection failure.

Alternative implementations of step S4101 may refer to alternative implementations of step S202 in fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

Step S4102, transmitting a first indication to the remote terminal.

Alternative implementations of step S4102 may refer to alternative implementations of step S203 of fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

In some embodiments, the first relay terminal may send the first indication to the remote terminal, but is not limited thereto, and the first relay terminal may also send the first indication to other subjects.

Alternatively, the first indication may be used for the first relay terminal to determine whether to maintain a connection with the remote terminal, e.g., the remote terminal may receive the first indication, and determine to maintain a connection with the first relay terminal based on the first indication.

Step S4103, obtaining a second indication.

Alternative implementations of step S4103 may refer to alternative implementations of step S205 of fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

In some embodiments, the first relay terminal may receive the second indication sent by the remote terminal, but is not limited thereto, and the first relay terminal may also receive other subjects to send the second indication.

Alternatively, the second indication may be for the first relay terminal to maintain a connection with the remote terminal, e.g., the first relay terminal may receive the second indication, and maintain a connection with the remote terminal based on the second indication.

Step S4104, maintaining connection with the remote terminal according to the second indication.

Alternative implementations of step S4104 may refer to alternative implementations of step S206 of fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

Step S4105, transmitting a sixth indication to the network device.

Alternative implementations of step S4105 may refer to alternative implementations of step S203 of fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

In some embodiments, the first relay terminal may send the sixth indication to the network device, but is not limited thereto, and the network device may also send the sixth indication to other bodies.

Alternatively, the sixth indication may be used by the network device to reestablish a connection with the remote terminal, e.g., the network device may receive the sixth indication to reestablish a connection with the remote terminal. Alternative implementations of this may refer to alternative implementations of step S208 in fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

Step S4106, a first connection reestablishment request is sent to the network device.

Alternative implementations of step S4106 may refer to alternative implementations of step S209 of fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

In some embodiments, the first relay terminal may send the first connection reestablishment request to the network device, but not limited thereto, and the first relay terminal may also send the first connection reestablishment request to other bodies.

Alternatively, the first connection reestablishment request may be used for 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. Alternative implementations of this may be referred to as an alternative implementation of step S212 in fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

Step S4107, obtaining an eighth indication.

Alternative implementations of step S4107 may refer to alternative implementations of step S213 of fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

In some embodiments, the first relay terminal may receive the eighth indication sent by the network device, but is not limited thereto, and the first relay terminal may also receive other agents to send the eighth indication.

Alternatively, the eighth indication may be for the first relay terminal to maintain a connection with the remote terminal, e.g., the first relay terminal may receive the eighth indication, according to which the connection with the remote terminal is maintained.

Step S4108, maintaining connection with the remote terminal according to the eighth instruction.

Alternative implementations of step S4108 may refer to alternative implementations of step S214 in fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

Step S4109, transmitting a third indication to the remote terminal.

Alternative implementations of step S4109 may refer to alternative implementations of step S215 of fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

In some embodiments, the first relay terminal may send the third indication to the remote terminal, but is not limited thereto, and the first relay terminal may also send the third indication to other subjects.

The method according to the embodiment of the present disclosure may include at least one of the above steps S4101 to S4109. For example, step S4102 may be implemented as a separate embodiment, step S4103 may be implemented as a separate embodiment, step S4101+s4102 may be implemented as a separate embodiment, step S4103+s4104 may be implemented as a separate embodiment, step S4101+s4106+ may be implemented as a separate embodiment, step S4103+s4104+s4105 may be implemented as a separate embodiment, and step S4106+s4107+s4108+s4109 may be implemented as a separate embodiment, but is not limited thereto.

In some embodiments, steps S4101 to S4109 may all be performed in the exchange order or simultaneously. For example, steps S4102, S4106 may be performed in exchange order or simultaneously.

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

In some embodiments, reference may be made to alternative implementations described before or after the description corresponding to fig. 4A.

Fig. 4B is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure. As shown in fig. 4B, an embodiment of the present disclosure relates to a connection establishment method, which may be performed by a first relay terminal, the method including:

Step S4201, determining connection failure.

An alternative implementation of this step S4201 may refer to an alternative implementation of step S202 of fig. 2, an alternative implementation of step S4101 of fig. 4A, and other relevant parts in the embodiments related to fig. 2 and 4A, which are not described here again.

Step S4202, a first indication is sent to the remote terminal.

An alternative implementation of this step S4202 may refer to an alternative implementation of step S203 of fig. 2, an alternative implementation of step S4102 of fig. 4A, and other relevant parts in the embodiments related to fig. 2 and 4A, which are not described here again.

Step S4203, acquiring a second instruction.

An alternative implementation of this step S4203 may refer to an alternative implementation of step S205 of fig. 2, an alternative implementation of step S4103 of fig. 4A, and other relevant parts in the embodiments related to fig. 2 and 4A, which are not described here again.

Step S4204, maintaining a connection with the remote terminal according to the second indication.

Alternative implementations of step S4204 may refer to alternative implementations of step S206 of fig. 2, alternative implementations of step S4104 of fig. 4A, and other relevant parts of the embodiments related to fig. 2 and 4A, which are not described here.

Step S4205, a sixth indication is sent to the network device.

An alternative implementation of this step S4205 may refer to an alternative implementation of step S203 of fig. 2, an alternative implementation of step S4105 of fig. 4A, and other relevant parts in the embodiments related to fig. 2 and 4A, which are not described here again.

Step S4206, a first connection reestablishment request is sent to the network device.

Alternative implementations of this step S406 may refer to alternative implementations of step S209 of fig. 2, alternative implementations of step S4106 of fig. 4A, and other relevant parts in the embodiments related to fig. 2 and 4A, which are not described herein.

In some embodiments, the above steps are optional steps.

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

Fig. 4C is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure. As shown in fig. 4C, an embodiment of the present disclosure relates to a connection establishment method, which may be performed by a first relay terminal, the method including:

Step S4301, determining that the connection has failed.

The optional implementation of step S4301 may refer to the optional implementation of step S202 in fig. 2, the optional implementation of step S4101 in fig. 4A, and other relevant parts in the embodiments related to fig. 2 and 4A, which are not described herein.

Step S4302, a first indication is sent to the remote terminal.

The optional implementation of step S4302 may refer to the optional implementation of step S203 in fig. 2, the optional implementation of step S4102 in fig. 4A, and other relevant parts in the embodiments related to fig. 2 and 4A, which are not described herein.

Step S4303, acquire a second instruction.

The optional implementation of step S4303 may refer to the optional implementation of step S205 in fig. 2, the optional implementation of step S4103 in fig. 4A, and other relevant parts in the embodiment related to fig. 4A 2, which are not described herein.

Step S4304, maintaining a connection with the remote terminal according to the second indication.

The optional implementation of step S4404 may refer to the optional implementation of step S206 in fig. 2, the optional implementation of step S4104 in fig. 4A, and other relevant parts in the embodiments related to fig. 2 and 4A, which are not described herein.

In some embodiments, the above steps are optional steps.

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

Fig. 4D is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure. As shown in fig. 4D, an embodiment of the present disclosure relates to a connection establishment method, which may be performed by a first relay terminal, the method including:

step S4401, determining a connection failure.

The optional implementation of step S4401 may refer to the optional implementation of step S202 in fig. 2, the optional implementation of step S4101 in fig. 4A, and other relevant parts in the embodiments related to fig. 2 and 4A, which are not described herein.

Step S4402, a first indication is sent to the remote terminal.

The optional implementation of step S4402 may refer to the optional implementation of step S203 in fig. 2, the optional implementation of step S4102 in fig. 4A, and other relevant parts in the embodiments related to fig. 2 and 4A, which are not described herein.

In some embodiments, the first indication is for the remote terminal to determine whether to maintain a connection with the first relay terminal.

In some embodiments, the method further comprises:

receiving a second indication sent by the remote terminal;

In some embodiments, the method further comprises:

receiving a seventh indication sent by the network equipment;

In some embodiments, the method further comprises:

and sending a third indication to the remote terminal.

In some embodiments, the method further comprises:

determining that the second cell does not support relay operation;

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

In some embodiments, the fifth indication includes failure information when the first relay terminal determines that connection re-establishment fails.

In some embodiments, the sixth indication comprises a terminal identification of the remote terminal.

In some embodiments, the seventh indication comprises a terminal identification of the remote terminal.

Fig. 5A is a flow diagram illustrating a connection establishment method according to an embodiment of the present disclosure. As shown in fig. 5A, an embodiment of the present disclosure relates to a connection establishment method, which may be performed by a network device, the method including:

step S5101, the first configuration information is transmitted.

Alternative implementations of the step S5101 may refer to alternative implementations of the step S201 in fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

In some embodiments, the network device may send the first configuration information to the remote terminal, but is not limited thereto, and the network device may also send the first configuration information to other bodies.

In some embodiments, the network device may transmit first configuration information specified by the protocol.

In some embodiments, the network device may process to obtain the first configuration information.

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-mentioned function may be default or default.

Step S5102, a sixth instruction is acquired.

Alternative implementations of step S5102 may refer to alternative implementations of step S203 in fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

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

Alternatively, the network device may reestablish a connection with the remote terminal according to the sixth indication, e.g., the network device may receive the sixth indication and reestablish a connection with the remote terminal. Alternative implementations of this may refer to alternative implementations of step S208 in fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

Step S5103, reestablishing connection with the remote terminal according to the sixth instruction.

Alternative implementations of the step S5103 may refer to alternative implementations of the step S208 in fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

Step S5104, a first connection reestablishment request is acquired.

Alternative implementations of the step S5104 may refer to alternative implementations of the step S209 of fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

In some embodiments, the network device may receive the first connection reestablishment request sent by the first relay terminal, but is not limited thereto, and the network device may also receive other bodies to send the first connection reestablishment request.

Alternatively, the network device may reconstruct 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 reconstruct the connection with the first relay terminal. Alternative implementations of this may be referred to as an alternative implementation of step S212 in fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

Step S5105, a fourth instruction is transmitted.

Alternative implementations of step S5105 may refer to alternative implementations of step S210 in fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

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

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-described function may be default or default.

Step S5106, reestablishes connection with the first relay terminal.

Alternative implementations of step S5106 may refer to alternative implementations of step S212 in fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

Step S5107, an eighth instruction is transmitted.

Alternative implementations of step S5107 may refer to alternative implementations of step S213 in fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

In some embodiments, the network device may send the eighth indication to the first relay terminal, but is not limited thereto, and the network device may also send the eighth indication to other principals.

Step S5108, a second connection reestablishment request is acquired.

Alternative implementations of step S5108 may refer to alternative implementations of step S216 in fig. 2, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

In some embodiments, the network device may receive the second connection reestablishment request sent by the remote terminal, but is not limited thereto, and the network device may also receive other agents to send the second connection reestablishment request.

Alternatively, 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 a connection with the remote terminal according to the second connection reestablishment request.

The method according to the embodiments of the present disclosure may include at least one of the above steps S5101 to S5108. For example, step S5101 may be implemented as a separate embodiment, step S5108 may be implemented as a separate embodiment, step S5102+s5103 may be implemented as a separate embodiment, step S5104+s5105 may be implemented as a separate embodiment, step S5104+s5106 may be implemented as a separate embodiment, and step S5104+s5106+s5107 may be implemented as a separate embodiment, but is not limited thereto.

In some embodiments, the steps S5101 to S5108 may be performed in sequence or simultaneously. For example, steps S5101, S5102 may be performed in exchange order or simultaneously.

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

In some embodiments, reference may be made to alternative implementations described before or after the description corresponding to fig. 5A.

Fig. 5B is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure. As shown in fig. 5B, an embodiment of the present disclosure relates to a connection establishment method, which may be performed by a network device, the method including:

step S5201, a sixth instruction is acquired.

The optional implementation of this step S5201 may refer to the optional implementation of step S203 in fig. 2, the optional implementation of step S5102 in fig. 5A, and other relevant parts in the embodiment related to fig. 2, which are not described herein.

And step S5202, reestablishing connection with the remote terminal according to the sixth instruction.

The optional implementation of this step S5202 may refer to the optional implementation of step S208 in fig. 2, the optional implementation of step S5103 in fig. 5A, and other relevant parts in the embodiments related to fig. 2 and 5A, which are not described herein.

Step S5203, acquiring a first connection reestablishment request.

The optional implementation of this step S5203 may refer to the optional implementation of step S209 in fig. 2, the optional implementation of step S5104 in fig. 5A, and other relevant parts in the embodiments related to fig. 2 and 5A, which are not described herein.

Step S5204, transmitting a fourth instruction.

The optional implementation of this step S5204 may refer to the optional implementation of step S210 in fig. 2, the optional implementation of step S5105 in fig. 5A, and other relevant parts in the embodiments related to fig. 2 and 5A, which are not described herein.

Step S5205, reestablishing the connection with the first relay terminal.

The optional implementation of step S5205 may refer to the optional implementation of step S212 in fig. 2, the optional implementation of step S5106 in fig. 5A, and other relevant parts in the embodiments related to fig. 2 and 5A, which are not described herein.

In some embodiments, the above steps are optional steps.

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

Fig. 5C is a flow chart illustrating a connection establishment method according to an embodiment of the present disclosure. As shown in fig. 5C, embodiments of the present disclosure relate to a connection establishment method, which may be performed by a network device, the method including:

Step S5301, transmitting the first configuration information.

The optional implementation manner of this step S5301 may refer to the optional implementation manner of step S201 in fig. 2, the optional implementation manner of step S5101 in fig. 5A, and other relevant parts in the embodiments related to fig. 2 and 5A, which are not described herein.

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

In some embodiments, the method further comprises:

receiving a sixth instruction sent by the first relay terminal;

In some embodiments, the method further comprises:

determining connection reestablishment failure of the remote terminal;

In some embodiments, the method further comprises:

Fig. 6 is an interactive schematic diagram illustrating a connection establishment method according to an embodiment of the present disclosure. As shown in fig. 6, embodiments of the present disclosure relate to a connection establishment method, which may be performed by a communication system, which may include:

step S601, the network device sends first configuration information to the remote terminal.

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

The optional implementation manner of this step S601 may refer to the optional implementation manner of step S201 in fig. 2, the optional implementation manner of step S5101 in fig. 5A, and other relevant parts in the embodiments related to fig. 2 and 5A, which are not described herein.

Step S602, the first relay terminal determines that the connection fails.

Alternative implementations of this step S602 may refer to alternative implementations of step S201 in fig. 2, alternative implementations of step S4101 in fig. 4A, and other relevant parts in the embodiments related to fig. 2 and 4A, which are not described herein.

Step S603, the first relay terminal sends a first indication to the remote terminal.

Wherein the first indication is for the remote terminal to determine whether to maintain a connection with the first relay terminal.

The optional implementation manner of this step S603 may refer to the optional implementation manner of step S201 in fig. 2, the optional implementation manner of step S4102 in fig. 4A, and other relevant parts in the embodiments related to fig. 2 and fig. 4A, which are not described herein.

Step S604, the remote terminal determines whether to maintain the connection with the first relay terminal.

Alternative implementations of step S605 may refer to alternative implementations of step S201 in fig. 2, alternative implementations of step S3103 in fig. 3A, and other relevant parts in the embodiments related to fig. 2 and 3A, which are not described herein.

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

in embodiment 1, the remote terminal receives the first failure indication sent by the relay terminal, determines whether to perform RRC reestablishment, and resumes connection with the network.

Embodiment 2, based on embodiment 1, the remote terminal determines to continue to maintain a connection with the relay terminal, suspends transmission of all radio bearers, and uses the default (default) configuration of the SRB.

Embodiment 3, based on embodiment 1, the remote terminal determines to release the connection with the relay terminal, selects an appropriate relay terminal or cell, and sends an RRC reestablishment request message to the network device.

Embodiment 4, based on embodiments 2 and 3, the remote terminal receives the first configuration sent by the network device, and indicates that when the relay terminal fails, the remote terminal maintains the connection with the relay terminal, and the remote terminal determines whether to continue to maintain the connection with the relay terminal based on the first configuration.

Embodiment 5, based on embodiment 2, starts a first timer, determines that the first timer expires, starts RRC reestablishment, releases connection with the relay terminal, selects an appropriate relay terminal or cell, and sends an RRC reestablishment request message to the network device.

Embodiment 6, based on embodiment 2, sends a first indication to the relay terminal indicating to remain connected to the relay terminal.

Embodiment 7, based on embodiments 1 and 2, receives the second failure indication sent by the relay terminal, starts RRC reestablishment, releases the connection with the relay terminal, selects an appropriate relay terminal or cell, and sends an RRC reestablishment request message to the network device.

Embodiment 8, based on embodiments 1 and 2, receives the RRC reestablishment message sent by the network device, updates the key, and resumes transmission of all radio bearers.

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

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

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

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

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

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

Embodiment 2, based on embodiment 1, receives a first indication sent by a remote terminal, and sends a second indication to a network device, indicating that the remote terminal remains connected for reestablishment.

In one implementation, the second indication may be carried in an RRC reestablishment request message or an RRC reestablishment complete message.

Embodiment 3, based on embodiment 2, the second indication may be an identification of the remote terminal.

In one implementation, the remote terminal is a remote terminal that reestablishes a connection for the hold.

Embodiment 4, based on embodiment 1, receives a third indication sent by the network device, indicating to keep the remote terminal connected.

In one implementation, the third indication may be carried in an RRC reestablishment message or an RRC reconfiguration message.

Embodiment 5, based on embodiment 4, the third indication may be an identification of the remote terminal.

Embodiment 6, based on embodiment 4, sends a re-establishment success indication to the remote terminal.

In one implementation, if the third indication is a remote terminal identification, a rebuild success indication is sent to the remote terminal determined by the remote terminal identification.

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

In one implementation, the relay terminal determines the reestablishment failure according to the timeout of the T311 timer, and the relay terminal determines the reestablishment failure according to the selected cell or the relay terminal not satisfying the preset channel condition.

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

Embodiment 9, based on embodiments 7 or 8, carries the reason for the failure in the second failure indication.

In one implementation, the failure cause may be any of the following: the timer is overtime, the selected cell or the relay terminal is unsuitable, the cell does not support relay, and the cell does not support sidelink.

In some embodiments of the present disclosure, a communication system may include a remote terminal, a first relay terminal, and a network device, wherein the remote terminal may perform the connection establishment method performed by the remote terminal in the foregoing embodiments of the present disclosure; the first relay terminal may perform the connection establishment method performed by the first relay terminal in the foregoing embodiments of the present disclosure; the network device may perform the connection establishment method performed by the network device in the foregoing embodiments of the present disclosure.

The embodiments of the present disclosure also propose an apparatus for implementing any of the above methods, for example, an apparatus is proposed, where the apparatus includes a unit or a module for implementing each step performed by the remote terminal in any of the above methods. For another example, an apparatus is also provided, where the apparatus includes a unit or a module configured to implement each step performed by the first relay terminal in any of the above methods. For another example, another apparatus is also proposed, which includes a unit or module configured to implement steps 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.

It should be understood that the division of each unit or module in the above apparatus is merely a division of a logic function, and may be fully or partially integrated into one physical entity or may be physically separated when actually implemented. Furthermore, units or modules in the apparatus may be implemented in the form of processor-invoked software: the device comprises, for example, a processor, the processor being connected to a memory, the memory having instructions stored therein, the processor invoking the instructions stored in the memory to perform any of the methods or to perform the functions of the units or modules of the device, wherein the processor is, for example, a general purpose processor, such as a central processing unit (Central Processing Unit, CPU) or microprocessor, and the memory is internal to the device or external to the device. Alternatively, the units or modules in the apparatus may be implemented in the form of hardware circuits, and part or all of the functions of the units or modules may be implemented by designing hardware circuits, which may be understood as one or more processors; for example, in one implementation, the hardware circuit is an Application-specific integrated circuit (ASIC), and the functions of some or all of the units or modules are implemented by designing a logic relationship of elements in the circuit; for another example, in another implementation, the above hardware circuit may be implemented by a programmable logic device (Programmable Logic Device, PLD), for example, a field programmable gate array (Field Programmable Gate Array, FPGA), which may include a large number of logic gates, and the connection relationship between the logic gates is configured by a configuration file, so as to implement the functions of some or all of the above units or modules. All units or modules of the above device may be realized in the form of invoking software by a processor, or in the form of hardware circuits, or in part in the form of invoking software by a processor, and in the rest in the form of hardware circuits.

In the disclosed embodiments, the processor is a circuit with signal processing capabilities, and in one implementation, the processor may be a circuit with instruction reading and running capabilities, such as a central processing unit (Central Processing Unit, CPU), microprocessor, graphics processor (Graphics Processing Unit, GPU) (which may be understood as a microprocessor), or digital signal processor (Digital Signal Processor, DSP), etc.; in another implementation, the processor may implement a function through a logic relationship of hardware circuitry that is fixed or reconfigurable, e.g., a hardware circuit implemented as an Application-specific integrated circuit (ASIC) or a programmable logic device (Programmable Logic Device, PLD), such as an FPGA. In the reconfigurable hardware circuit, the processor loads the configuration document, and the process of implementing the configuration of the hardware circuit may be understood as a process of loading instructions by the processor to implement the functions of some or all of the above units or modules. Furthermore, hardware circuits designed for artificial intelligence may be used, which may be understood as ASICs, such as neural network processing units (Neural Network Processing Unit, NPU), tensor processing units (Tensor Processing Unit, TPU), deep learning processing units (Deep learning Processing Unit, DPU), etc.

Fig. 7A is a schematic structural diagram of a remote terminal according to an embodiment of the present disclosure. As shown in fig. 7A, the remote terminal 151 may include: at least one of the transceiver module 8101, the processing module 8102, and the like. In some embodiments, the transceiver module 8101 is configured to receive a first indication; the first indication is an indication sent when the first relay terminal determines that the connection fails; the processing module 8102 is configured to determine whether to maintain a connection with the first relay terminal. Optionally, the transceiver module 8101 may be configured to perform at least one of the communication steps (e.g., step S201, step S203, step S205, step S210, but not limited thereto) such as transmission and/or reception performed by the remote terminal 151 in any of the above methods, which is not described herein. Optionally, the processing module 8102 may be configured to perform at least one of the other steps (e.g., step S204, step S211, but not limited thereto) performed by the remote terminal 151 in any of the above methods, which is not described herein.

Fig. 7B is a schematic structural diagram of a first relay terminal according to an embodiment of the present disclosure. As shown in fig. 7B, the first relay terminal 153 may include: at least one of a processing module 8201, a transceiver module 8202, and the like. 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, the first indication being used by the remote terminal to determine whether to maintain a connection with the first relay terminal. Optionally, the processing module 8201 may be configured to perform at least one of the communication steps (e.g., step S206, step S214, but not limited thereto) such as transmission and/or reception performed by the first relay terminal 153 in any of the above methods, which is not described herein. Optionally, the transceiver 8202 may be used to perform at least one of the other steps (e.g., step S203, step S205, step S207, step S209, step S213, but not limited thereto) performed by the first relay terminal 153 in any of the above methods, which is not described herein.

Fig. 7C is a schematic structural diagram of a network device according to an embodiment of the present disclosure. As shown in fig. 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, where the first configuration information indicates whether the remote terminal maintains a connection with a first relay terminal when the first relay terminal fails. Optionally, the transceiver module 8301 may be configured to perform at least one of the communication steps (e.g., 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 is not described herein.

In some embodiments, the transceiver module may include a transmitting module and/or a receiving module, which may be separate or integrated. Alternatively, the transceiver module may be interchangeable with a transceiver.

In some embodiments, the processing module may be a single module or may include multiple sub-modules. Optionally, the plurality of sub-modules perform all or part of the steps required to be performed by the processing module, respectively. Alternatively, the processing module may be interchanged with the processor.

Fig. 8A is a schematic structural diagram of a communication device 9100 according to an embodiment of the present disclosure. The communication device 9100 may be a network device (e.g., an access network device, a core network device, etc.), a terminal device (e.g., a user device, etc.), a chip system, a processor, etc. that supports the network device to implement any of the above methods, or a chip, a chip system, a processor, etc. that supports the terminal device to implement any of the above methods. The communication device 9100 may be used to implement the methods described in the above method embodiments, and specific reference may be made to the description in the above method embodiments.

As shown in fig. 8A, the communication device 9100 includes one or more processors 9101. The processor 9101 may be a general-purpose processor or a special-purpose processor, and may be, 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 processor may be used to control communication devices (e.g., base stations, baseband chips, terminal devices, terminal device chips, DUs or CUs, etc.), execute programs, and process data for the programs. The communication device 9100 is configured to perform any of the above methods.

In some embodiments, communication device 9100 also includes one or more memories 9102 for storing instructions. Alternatively, all or part of the memory 9102 may be external to the communication device 9100.

In some embodiments, the communication device 9100 further comprises one or more transceivers 9103. When the communication device 9100 includes one or more transceivers 9103, the transceivers 9103 perform at least one of the communication steps (e.g., but not limited to, step S2101, step S2102, step S2104, step S2106) of the above-described method, and the transceiver 9101 performs at least one of the other steps (e.g., but not limited to, step S2103, step S2105, step S2107).

In some embodiments, the transceiver may include a receiver and/or a transmitter, which may be separate or integrated. Alternatively, terms such as transceiver, transceiver unit, transceiver circuit, etc. may be replaced with each other, terms such as transmitter, transmitter circuit, etc. may be replaced with each other, and terms such as receiver, receiving unit, receiver, receiving circuit, etc. may be replaced with each other.

In some embodiments, the communication device 9100 can include one or more interface circuits. Optionally, interface circuitry is coupled to memory 9102, which may be used to receive signals from memory 9102 or other devices, and may be used to transmit signals to memory 9102 or other devices. For example, the interface circuit may read instructions stored in the memory 9102 and send the instructions to the processor 9101.

The communication device 9100 in the above embodiment description 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 a stand-alone device or may be part of a larger device. For example, the communication device may be: 1) A stand-alone integrated circuit IC, or chip, or a system-on-a-chip or subsystem; (2) A set of one or more ICs, optionally including storage means for storing data, programs; (3) an ASIC, such as a Modem (Modem); (4) modules that may be embedded within other devices; (5) A receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handset, a mobile unit, a vehicle-mounted device, a network device, a cloud device, an artificial intelligent device, and the like; (6) others, and so on.

Fig. 8B is a schematic structural diagram of a chip 9200 according to an embodiment of the present disclosure. For the case where the communication device 9100 may be a chip or a chip system, a schematic structural diagram of the chip 9200 shown in fig. 8B may be referred to, but is not limited thereto.

The chip 9200 includes one or more processors 9201, the chip 9200 being configured to perform any of the methods described above.

In some embodiments, the chip 9200 further includes one or more interface circuits 9203. Optionally, an interface circuit 9203 is connected to the memory 9202, the interface circuit 9203 may be used to receive signals from the memory 9202 or other devices, and the interface circuit 9203 may be used to transmit signals to the memory 9202 or other devices. For example, the interface circuit 9203 may read an instruction stored in the memory 9202 and transmit the instruction to the processor 9201.

In some embodiments, the interface circuit 9203 performs at least one of the communication steps (e.g., but not limited to, step S2101, step S2102, step S2104, step S2106) of the above method, and the processor 9201 performs at least one of the other steps (e.g., but not limited to, step S2103, step S2105, step S2107).

In some embodiments, the terms interface circuit, interface, transceiver pin, transceiver, etc. may be interchanged.

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 external to the chip 9200.

The disclosed embodiments also provide a storage medium having instructions stored thereon that, when executed on the communication device 9100, cause the communication device 9100 to perform any of the above methods. Optionally, the storage medium is an electronic storage medium. Alternatively, the storage medium described above is a computer-readable storage medium, but is not limited thereto, and it may be a storage medium readable by other devices. Alternatively, the above-described storage medium may be a non-transitory (non-transitory) storage medium, but is not limited thereto, and it may also be a transitory storage medium.

The disclosed embodiments also propose a program product which, when executed by the communication device 9100, causes the communication device 9100 to perform any of the above methods. Alternatively, the program product may be a computer program product.

The disclosed embodiments also propose computer programs, which when run on a computer, cause the computer to carry out any of the above methods.

Claims

1. A method of connection establishment, the method comprising:

2. The method of claim 1, wherein the determining whether to maintain a connection with the first relay terminal comprises:

it is determined to maintain a connection with the first relay terminal.

3. The method according to claim 2, wherein the method further comprises:

4. A method according to claim 2 or 3, characterized in that the method further comprises:

5. A method according to claim 2 or 3, characterized in that the method further comprises:

and carrying out radio bearer transmission according to the fourth indication.

6. A method according to claim 2 or 3, characterized in that the method further comprises:

7. The method of claim 6, wherein the determining that the connection re-establishment of the first relay terminal failed comprises at least one of:

8. The method of claim 1, wherein the determining whether to maintain a connection with the first relay terminal comprises:

determining that connection with the first relay terminal is not maintained;

the method further comprises the steps of:

9. The method according to any one of claims 1-8, further comprising:

10. A method of connection establishment, the method comprising:

the first relay terminal determines connection failure;

11. The method according to claim 10, wherein the method further comprises:

receiving a second indication sent by the remote terminal;

12. The method of claim 11, wherein the method further comprises:

13. The method according to claim 10, wherein the method further comprises:

receiving a seventh indication sent by the network equipment;

14. The method of claim 13, wherein the method further comprises:

15. The method according to any one of claims 10-14, further comprising:

16. The method of claim 15, wherein the method further comprises:

17. The method according to claim 15 or 16, characterized in that the method further comprises:

and sending a third indication to the remote terminal.

18. The method of claim 15, wherein the method further comprises:

19. The method of claim 18, wherein the determining that the connection re-establishment of the first relay terminal failed comprises at least one of:

Determining that the second cell does not support relay operation;

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

determining that a second timer expires, the second timer being started when the first connection reestablishment request is sent to the network device;

20. The method according to claim 18 or 19, wherein the fifth indication comprises failure information when the first relay terminal determines that connection re-establishment fails.

21. The method according to claim 12 or 14, wherein the sixth indication comprises a terminal identification of the remote terminal.

22. The method according to claim 13 or 14, wherein the seventh indication comprises a terminal identification of the remote terminal.

23. A method of connection establishment, the method comprising:

24. The method of claim 23, wherein the method further comprises:

25. The method of claim 24, wherein the method further comprises:

receiving a sixth instruction sent by the first relay terminal;

26. The method according to any one of claims 23-25, further comprising:

27. The method of claim 26, wherein the method further comprises:

28. The method of claim 26, wherein the method further comprises:

Determining connection reestablishment failure of the remote terminal;

29. The method according to claim 26 or 27, characterized in that the method further comprises:

30. A method of connection establishment, the method comprising:

the first relay terminal determines connection failure;

31. A remote terminal, comprising:

32. A first relay terminal, comprising:

a processing module configured to determine a connection failure;

33. A network device, comprising:

34. A remote terminal, comprising:

one or more processors;

wherein the remote terminal is configured to perform the connection establishment method of any of claims 1-9.

35. A first relay terminal, comprising:

one or more processors;

wherein the relay terminal is configured to perform the connection establishment method of any one of claims 10-22.

36. A network device, comprising:

One or more processors;

wherein the network device is configured to perform the connection establishment method of any of claims 23-29.

37. A communication system comprising a remote terminal configured to implement the connection establishment method of any of claims 1-9, a first relay terminal configured to implement the connection establishment method of any of claims 10-22, and a network device configured to implement the connection establishment method of any of claims 23-29.

38. A storage medium storing instructions that, when executed on a communication device, cause the communication device to perform the connection establishment method of any one of claims 1-9 or claims 10-22 or claims 23-29.