CN113811021A

CN113811021A - Communication method and device

Info

Publication number: CN113811021A
Application number: CN202010549963.2A
Authority: CN
Inventors: 李永翠; 吴义壮; 倪慧
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2021-12-17
Also published as: WO2021254116A1

Abstract

The embodiment of the application provides a communication method and device, and relates to the field of communication. The method comprises the following steps: the terminal equipment receives indication information from the first network element; the indication information is used for indicating that the wireless access network resource meets the requirement of redundant transmission; the terminal equipment establishes a second session according to the indication information; the terminal equipment establishes a first session, and releases or fails to establish a third session which is redundant with the first session; the first session and the second session are redundant sessions of each other. Therefore, when detecting that the wireless access network resource meets the redundant transmission requirement, the network side can send the indication information to the terminal equipment to indicate that the wireless access network resource meets the redundant transmission requirement, and then the terminal equipment can establish the session, so that the condition that the terminal initiates an invalid session establishment request due to the fact that the wireless access network resource cannot meet the redundant transmission requirement can be avoided, and signaling resources are saved.

Description

Communication method and device

Technical Field

The present application relates to communications technologies, and in particular, to a communication method and apparatus.

Background

In a wireless communication system, for example: in a New Radio (NR) system, a User Equipment (UE) may establish a Protocol Data Unit (PDU) session with a Data Network (DN) network element through a User Plane Function (UPF) network element, where the PDU session provides a data transmission service between a terminal device and the DN network element.

In the scenario of ultra-reliable and low-latency communications (URLLC), the UE may establish redundant PDU sessions to transmit the same service stream, thereby achieving high-reliability transmission.

However, when the UE performs the redundant PDU session transmission, there may be a situation that the radio access network resources cannot meet the requirement of the redundant transmission, and the UE needs to try to initiate a new redundant session establishment again at intervals. If the network side determines that the radio access network resources still cannot meet the redundant transmission requirement, the network side will refuse the session establishment process, resulting in the waste of signaling resources.

Disclosure of Invention

The embodiment of the application provides a communication method and a communication device, when a network side detects that wireless access network resources meet redundant transmission requirements, the network side can send indication information to a terminal device to indicate the terminal device to establish a session, so that the situation that the terminal initiates an invalid session establishment request due to the fact that the wireless access network resources cannot meet the redundant transmission requirements can be avoided, and signaling resources are saved.

In a first aspect, an embodiment of the present application provides a communication method, including: the terminal equipment receives indication information from the first network element; the indication information is used for indicating that the wireless access network resource meets the requirement of redundant transmission; the terminal equipment establishes a second session according to the indication information; the terminal equipment establishes a first session, and releases or fails to establish a third session which is redundant with the first session; the first session and the second session are redundant sessions of each other. Therefore, when detecting that the wireless access network resource meets the redundant transmission requirement, the network side can send the indication information to the terminal equipment to indicate that the wireless access network resource meets the redundant transmission requirement, and then the terminal equipment can establish the session, so that the condition that the terminal initiates an invalid session establishment request due to the fact that the wireless access network resource cannot meet the redundant transmission requirement can be avoided, and signaling resources are saved.

In a possible implementation manner, the receiving, by the terminal device, the indication information from the first network element includes: the terminal equipment receives the indication information from the radio access network device. In this way, the terminal device may establish the second session according to the indication of the radio access network apparatus.

In a possible implementation manner, the receiving, by the terminal device, the indication information from the first network element includes: the terminal equipment receives the indication information from the session management network element. In this way, the terminal device may establish the second session according to the indication of the session management network element.

In a possible implementation manner, the establishing, by the terminal device, the second session according to the indication information includes: and the terminal equipment establishes a second session in the first time period according to the indication information. In this way, the terminal device may be instructed to establish a time-efficient second session.

In one possible implementation manner, the method further includes: the terminal equipment receives the identification information of the first session; the indication information is used for indicating the terminal equipment to establish the sessions of the first sessions which are mutually redundant. Therefore, the terminal equipment does not need to further determine the first session, and the steps of establishing the mutual redundant sessions of the first sessions by the terminal equipment are saved.

In a possible implementation manner, the establishing, by the terminal device, the second session according to the indication information includes: the terminal equipment determines attribute information of the second session according to the terminal strategy; wherein the attribute information of the second session is correlated with the attribute information of the first session; the terminal equipment sends a session establishment request to a session management network element; wherein the session establishment request comprises attribute information of the second session.

In a possible implementation manner, the determining, by the terminal device, the attribute information of the second session according to the terminal policy includes: the terminal equipment determines that the attribute information of the second session is the same as the attribute information of the third session; and the attribute information of the third session is determined by the terminal equipment according to the terminal policy.

In a second aspect, an embodiment of the present application provides a communication method, including: the wireless access network device detects that the wireless access network resource meets the redundant transmission requirement; the wireless access network device sends indication information to the terminal equipment, wherein the indication information is used for indicating that the wireless access network resource meets the requirement of redundant transmission; the terminal device establishes a first session, and releases or fails to establish a third session which is redundant with the first session.

In a possible implementation manner, the sending, by the radio access network apparatus, the indication information to the terminal device includes: the wireless access network device sends indication information to the terminal equipment through the session management network element; or, the wireless access network device sends the indication information to the terminal equipment through the access network layer signal; or, the radio access network device sends the indication information to the session management network element, and the session management network element is used for indicating the terminal equipment to establish the redundant session according to the indication information.

In a possible implementation manner, the indication information is used to instruct the terminal device to establish the second session within the first time period, and the first session and the second session are redundant sessions.

In a possible implementation manner, the indication information is used for indicating the terminal device to establish a second session that is redundant with the first session; the identification information of the first session is sent to the terminal device by the first network element.

In a third aspect, an embodiment of the present application provides a communication method, including: the session management network element receives indication information from the radio access network device, wherein the indication information is used for indicating that the radio access network resource meets the requirement of redundant transmission; the session management network element indicates the terminal equipment to establish a second session according to the indication information; the terminal equipment establishes a first session, and releases or fails to establish a third session which is redundant with the first session; the first session and the second session are redundant sessions of each other.

In one possible implementation manner, the method further includes: a session management network element receives a session establishment request from terminal equipment; the session establishing request comprises attribute information of the second session, and the attribute information of the second session is the same as the attribute information of the third session.

In a fourth aspect, an embodiment of the present application provides a communication method, including: a session management network element receives a session establishment request for establishing a first session from a terminal device; the session management network element determines that the first session is a redundant session; the session management network element determines a redundant sequence number for the first session according to the session establishment request; wherein, under the condition that the session establishment request includes identification information of a session, the redundant sequence number is a first value; under the condition that the session establishment request comprises the identification information of the first session and the identification information of the second session, the redundancy sequence number is a second value; the first value is different from the second value; the first session and the second session are redundant sessions; and the session management network element sends the redundant serial number to the wireless access network device.

In one possible implementation manner, the determining, by the session management network element, the redundant sequence number for the first session according to the session establishment request includes: and under the condition that the session establishment request comprises identification information of one session, the session management network element determines the redundant sequence number according to the identification information of the first session.

In one possible implementation, the session establishment request includes attribute information of the first session.

In one possible implementation manner, the determining, by the session management network element, that the first session is a redundant session includes: the session management network element determines that the first session is a redundant session based on one or more of the following data: the policy from the policy control network element, the local policy of the session management network element, the subscription data of the terminal device, and the attribute information of the first session carried by the session establishment request.

In a fifth aspect, an embodiment of the present application provides a communication apparatus, where the communication apparatus may be a terminal device, or may be a chip or a chip system in the terminal device. The communication device may include a processing unit and a communication unit. When the communication apparatus is a terminal device, the processing unit may be a processor, and the communication unit may be a communication interface or an interface circuit. The communication device may further comprise a storage unit, which may be a memory. The storage unit is configured to store instructions, and the processing unit executes the instructions stored by the storage unit to enable the terminal device to implement the first aspect or a communication method described in any one of the possible implementation manners of the first aspect. When the communication means is a chip or a system of chips within a terminal device, the processing unit may be a processor and the communication unit may be a communication interface. For example, the communication interface may be an input/output interface, a pin or a circuit, etc. The processing unit executes the instructions stored by the storage unit to cause the terminal device to implement the first aspect or one of the possible implementation manners of the first aspect. The storage unit may be a storage unit (e.g., a register, a buffer, etc.) within the chip, or may be a storage unit (e.g., a read-only memory, a random access memory, etc.) located outside the chip within the terminal device.

Exemplarily, the communication unit is configured to receive indication information from a first network element; the indication information is used for indicating that the wireless access network resource meets the requirement of redundant transmission; the processing unit is used for establishing a second session according to the indication information; the communication device establishes a first session, and releases or fails to establish a third session which is redundant with the first session; the first session and the second session are redundant sessions of each other.

In a possible implementation, the communication unit is specifically configured to receive indication information from the radio access network apparatus.

In a possible implementation, the communication unit is specifically configured to receive indication information from a session management network element.

In a possible implementation manner, the processing unit is specifically configured to establish the second session within the first time period according to the indication information.

In a possible implementation manner, the communication unit is further configured to receive identification information of the first session; the indication information is used for indicating the processing unit to establish the sessions in which the first sessions are mutually redundant.

In a possible implementation manner, the processing unit is specifically configured to determine attribute information of the second session according to a terminal policy; wherein the attribute information of the second session is correlated with the attribute information of the first session; the communication unit is also used for sending a session establishment request to the session management network element; wherein the session establishment request comprises attribute information of the second session.

In a possible implementation manner, the processing unit is specifically configured to determine that the attribute information of the second session is the same as the attribute information of the third session; the attribute information of the third session is determined by the processing unit according to the terminal policy.

In a sixth aspect, an embodiment of the present application provides a communication apparatus. The communication device may be a radio access network device, or may be a chip or a system of chips within a radio access network device. The communication device may include a processing unit and a communication unit. When the communication device is a radio access network device, the processing unit may be a processor and the communication unit may be a communication interface or interface circuitry. The communication device may further comprise a storage unit, which may be a memory. The storage unit is configured to store instructions, and the processing unit executes the instructions stored by the storage unit to enable the radio access network apparatus to implement a communication method described in the second aspect or any one of the possible implementation manners of the second aspect. When the communication device is a chip or a system of chips within a radio access network device, the processing unit may be a processor and the communication unit may be a communication interface. For example, the communication interface may be an input/output interface, a pin or a circuit, etc. The processing unit executes the instructions stored by the storage unit to cause the radio access network apparatus to implement a communication method as described in the second aspect or any one of the possible implementations of the second aspect. The memory unit may be a memory unit (e.g., a register, a buffer, etc.) within the chip, or a memory unit (e.g., a read only memory, a random access memory, etc.) external to the chip within the radio access network device.

Exemplarily, the processing unit is configured to detect that the radio access network resource satisfies a redundant transmission requirement; the communication unit is used for sending indication information to the terminal equipment, and the indication information is used for indicating that the wireless access network resource meets the requirement of redundant transmission; the terminal device establishes a first session, and releases or fails to establish a third session which is redundant with the first session.

In a possible implementation manner, the communication unit is specifically configured to: sending indication information to the terminal equipment through the session management network element; or, sending indication information to the terminal equipment through the access network layer signal; or, sending indication information to a session management network element, where the session management network element is used to indicate to the terminal device to establish a redundant session according to the indication information.

In a seventh aspect, an embodiment of the present application provides a communication apparatus. The communication device may be a session management network element, or may be a chip or a system of chips in the session management network element. The communication device may include a processing unit and a communication unit. When the communication device is a session management network element, the processing unit may be a processor and the communication unit may be a communication interface or interface circuit. The communication device may further comprise a storage unit, which may be a memory. The storage unit is configured to store instructions, and the processing unit executes the instructions stored by the storage unit to enable the session management network element to implement a communication method described in the third aspect or any one of the possible implementation manners of the third aspect. When the communication means is a chip or a system of chips within a session management network element, the processing unit may be a processor and the communication unit may be a communication interface. For example, the communication interface may be an input/output interface, a pin or a circuit, etc. The processing unit executes the instructions stored by the storage unit to enable the session management network element to implement a communication method described in the third aspect or any one of the possible implementation manners of the third aspect. The memory unit may be a memory unit (e.g. register, cache, etc.) within the chip, or a memory unit (e.g. read only memory, random access memory, etc.) located outside the chip within the session management network element.

Illustratively, the communication unit is configured to receive indication information from the radio access network apparatus, where the indication information is used to indicate that the radio access network resource meets the redundant transmission requirement; the processing unit is used for indicating the terminal equipment to establish a second session according to the indication information; the terminal equipment establishes a first session, and releases or fails to establish a third session which is redundant with the first session; the first session and the second session are redundant sessions of each other.

In a possible implementation manner, the communication unit is further configured to receive a session establishment request from the terminal device; the session establishing request comprises attribute information of the second session, and the attribute information of the second session is the same as the attribute information of the third session.

In an eighth aspect, an embodiment of the present application provides a communication apparatus. The communication device may be a session management network element, or may be a chip or a system of chips in the session management network element. The communication device may include a processing unit and a communication unit. When the communication device is a session management network element, the processing unit may be a processor and the communication unit may be a communication interface or interface circuit. The communication device may further comprise a storage unit, which may be a memory. The storage unit is configured to store instructions, and the processing unit executes the instructions stored by the storage unit to enable the session management network element to implement a communication method described in the fourth aspect or any one of the possible implementation manners of the fourth aspect. When the communication means is a chip or a system of chips within a session management network element, the processing unit may be a processor and the communication unit may be a communication interface. For example, the communication interface may be an input/output interface, a pin or a circuit, etc. The processing unit executes the instructions stored by the storage unit to cause the session management network element to implement a communication method as described in the fourth aspect or any one of the possible implementations of the fourth aspect. The memory unit may be a memory unit (e.g. register, cache, etc.) within the chip, or a memory unit (e.g. read only memory, random access memory, etc.) located outside the chip within the session management network element.

Exemplarily, the communication unit is configured to receive a session establishment request for establishing the first session from the terminal device; a processing unit, configured to determine that the first session is a redundant session; the processing unit is also used for determining a redundant sequence number for the first session according to the session establishment request; wherein, under the condition that the session establishment request includes identification information of a session, the redundant sequence number is a first value; under the condition that the session establishment request comprises the identification information of the first session and the identification information of the second session, the redundancy sequence number is a second value; the first value is different from the second value; the first session and the second session are redundant sessions; and the communication unit is also used for sending the redundant serial number to the wireless access network device.

In a possible implementation manner, the processing unit is specifically configured to, in a case that the session establishment request includes identification information of one session, determine, by the session management network element, the redundant sequence number according to the identification information of the first session.

In a possible implementation, the processing unit is specifically configured to determine that the first session is a redundant session according to one or more of the following data: the policy from the policy control network element, the local policy of the session management network element, the subscription data of the terminal device, and the attribute information of the first session carried by the session establishment request.

In a ninth aspect, embodiments of the present application provide a computer-readable storage medium, in which a computer program or instructions are stored, and when the computer program or instructions are run on a computer, the computer is caused to execute the communication method described in any one of the implementation manners of the first aspect to the fourth aspect.

In a tenth aspect, embodiments of the present application provide a computer program product including instructions that, when executed on a computer, cause the computer to perform the communication method described in any one implementation manner of the first aspect to the fourth aspect.

In an eleventh aspect, an embodiment of the present application provides a communication system, where the communication system includes any one or more of the following: the communication device described in the fifth aspect and various possible implementations, the communication device described in the sixth aspect and various possible implementations, the communication device described in the seventh aspect and various possible implementations, and the communication device described in the eighth aspect and various possible implementations.

In a twelfth aspect, an embodiment of the present application provides a communication apparatus, which includes a processor and a storage medium, where the storage medium stores instructions, and the instructions, when executed by the processor, implement the communication method as described in any implementation manner of the first aspect to the fourth aspect.

In a thirteenth aspect, the present application provides a chip or a chip system, where the chip or the chip system includes at least one processor and a communication interface, the communication interface and the at least one processor are interconnected by a line, and the at least one processor is configured to execute a computer program or instructions to perform the communication method described in any of the implementation manners of the first aspect to the fourth aspect.

The communication interface in the chip may be an input/output interface, a pin, a circuit, or the like.

In one possible implementation, the chip or chip system described above in this application further comprises at least one memory having instructions stored therein. The memory may be a storage unit inside the chip, such as a register, a cache, etc., or may be a storage unit of the chip (e.g., a read-only memory, a random access memory, etc.).

It should be understood that the second aspect to the thirteenth aspect of the embodiments of the present application correspond to the technical solutions of the first aspect of the embodiments of the present application, and beneficial effects obtained by various aspects and corresponding possible implementations are similar and will not be described again.

Drawings

Fig. 1 is a schematic diagram of establishing redundant session transport service data according to an embodiment of the present application;

fig. 2 is a schematic diagram of a communication method provided in an embodiment of the present application;

fig. 3 is a schematic diagram of a network architecture according to an embodiment of the present application;

fig. 4 is a flowchart illustrating a communication method according to an embodiment of the present application;

fig. 5 is a flowchart illustrating a communication method according to an embodiment of the present application;

fig. 6 is a flowchart illustrating a communication method according to an embodiment of the present application;

fig. 7 is a flowchart illustrating a communication method according to an embodiment of the present application;

fig. 8 is a flowchart illustrating a communication method according to an embodiment of the present application;

fig. 9 is a flowchart illustrating a communication method according to an embodiment of the present application;

fig. 10 is a flowchart illustrating a communication method according to an embodiment of the present application;

fig. 11 is a flowchart illustrating a communication method according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of a chip according to an embodiment of the present application.

Detailed Description

In the embodiments of the present application, terms such as "first" and "second" are used to distinguish the same or similar items having substantially the same function and action. For example, the first network and the second network are only for distinguishing different networks, and the order of the first network and the second network is not limited. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.

It is noted that, in the present application, words such as "exemplary" or "for example" are used to mean exemplary, illustrative, or descriptive. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

In the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.

The 3rd Generation Partnership Project (3 GPP) organization defines three major scenarios of 5G, enhanced mobile broadband (eMBB), large-scale internet of things (mtc), low-latency and low-reliability connectivity (URLLC).

Among them, URLLC has the features of high reliability, low delay, and high availability. The method can be applied to the following various scenes and applications: industrial applications and controls, traffic safety and controls, remote manufacturing, remote training or remote surgery, etc.

For example, the delay and reliability metrics of URLLC may be defined as follows. For example, in the definition of latency: for URLLC, the user plane uplink delay is targeted to 0.5ms, the downlink delay target is 0.5 ms. In the definition of reliability: defined as the success rate of transmitting X bytes of data packets within a certain delay, e.g. reliability requirement of a single transmission of URLLC is: the reliability of transmitting 32 byte packets is 1 within 1ms of user plane time delay^～10^{^}(-5)。

In a possible implementation manner, the UE may transmit the same service data by establishing a redundant session, so as to achieve high reliability.

The user plane connections corresponding to redundant PDU sessions (hereinafter referred to as sessions) are independent of each other. For example, the user plane of the redundant session 1 corresponds to a UE, a main radio access network (M-RAN), a User Plane Function (UPF) network element UPF1 network element, and a UPF1 network element serves as an anchor UPF; the redundant session 2 user plane corresponds to a UE, a secondary radio access network (S-RAN), and a UPF2 network element, and the UPF2 network element serves as an anchor UPF. On the signaling connection, the UE and the network side AMF network element have an N1 connection; the signaling message is sent to a mobility management function (AMF) network element through the M-RAN.

In a possible implementation manner, the UE may use a user equipment routing selection policy (URSP) to implement the establishment of two redundant PDU sessions. For example, it may be implemented by two URSP rules. Wherein each URSP rule contains a flow description and a routing description. The flow descriptions in the two URSP rules are different. The stream description may contain a Data Network Name (DNN), an Internet Protocol (IP) description, or a non-IP description (such as a Media Access Control (MAC) address, a Virtual Local Area Network (VLAN) identifier). The routing description may include DNN, single network slice selection assistance information (S-NSSAI), and other information. Different flow descriptions correspond to different routing descriptions. Thus, when UE initiates URLLC service, the URLLC service is determined to correspond to two different URSP rules according to the URSP, and then two redundant PDU sessions are initiated.

Exemplarily, fig. 1 shows a schematic diagram of a possible UE to establish redundant session transmission service data.

The UE may decide to initiate a redundant PDU session setup according to the URSP or locally configured rules. Redundant PDU sessions correspond to different DNN, S-NSSAI combinations, e.g., redundant session 1 corresponds to (DNN, S-NSSAI) -a and redundant session 2 corresponds to (DNN, S-NSSA) -b. The UE sends a session establishment request carrying (DNN, S-NSSAI) -a to the SMF network element, for example, when the UE sends a session establishment request for redundant session 1 to the SMF net buddy, the UE carries (DNN, S-NSSAI) -a; when the UE sends a session establishment request of the redundant session 2 to the SMF net friend, the UE carries (DNN, S-NSSAI) -b and the like.

The SMF network element may determine whether the PDU session is redundantly processed according to at least one of DNN, S-NSSAI, local policy, charging and charging control rule (PCC), subscription data (e.g., whether the subscription allows the UE to establish a redundant PDU session). Whether the PDU session is redundantly processed means whether two sessions that are redundant to each other are established for the PDU session, or whether a redundant sequence number is allocated for the PDU session. If the PDU session needs redundancy processing, the SMF network element determines a Redundancy Sequence Number (RSN) which is used for indicating the NG-RAN that the PDU session needs redundancy processing. In a possible implementation, different RSN values are used to indicate different user plane connections.

And the SMF network element selects proper UPF network elements for the two redundant sessions respectively according to the UPF network element selection strategy configured by the operator so as to realize an independent user plane.

The SMF network element sends the RSN to the M-RAN.

And the M-RAN determines whether RAN resources can meet the user plane requirement of the PDU session according to local configuration. The M-RAN selects the S-RAN based on the RSN, and determines to establish Dual Connectivity (DC). And the M-RAN determines the corresponding user plane resource according to the RSN. For example, if the RSN of redundant session 1 is 1, the M-RAN returns M-RAN tunnel information, and a user plane connection between the M-RAN and the UPF1 network element may be established. If the M-RAN receives RSN of redundant session 2 equal to 2, the M-RAN returns S-RAN tunnel information, and a user plane connection between the S-RAN and the UPF2 network element may be established.

When the M-RAN decides that the RAN resources cannot meet high reliability, e.g. due to UE mobility, the M-RAN cannot maintain a DC connection, the RAN may send a notification to the SMF network element to let the SMF network element decide whether to release the session.

However, the first problem is: when the SMF network element or M-RAN decides to release one of the sessions, the UE cannot know when to initiate a new redundant session because the UE cannot perceive the M-RAN resource condition, i.e., cannot perceive whether the M-RAN can establish a DC. If the UE attempts to initiate a new redundant session establishment at intervals, possible resources on the network side may still be unsatisfied, thereby rejecting the session establishment and introducing unnecessary signaling interaction.

Based on this, the embodiment of the present application provides a communication method, when detecting that the radio access network resource meets the redundant transmission requirement, the network side may send indication information to the terminal device, and instruct the terminal device to establish a session, so that a situation that the terminal initiates an invalid session establishment request due to the fact that the radio access network resource cannot meet the redundant transmission requirement may be avoided, and signaling resources are saved.

For example, fig. 2 shows a schematic diagram of a communication manner according to an embodiment of the present application. As shown in fig. 2, an SMF network element or an M-RAN determines to release a redundant session corresponding to a UPF2 network element, and when the M-RAN detects that radio access network resources meet a redundant transmission requirement, the M-RAN may send indication information to a terminal device in a mode 1 or a mode 2 to indicate the terminal device to establish the session, in the mode 1, the M-RAN informs an SMF1 that the radio access network resources meet the redundant transmission requirement, and the SMF1 further indicates the terminal device to establish the session; in mode 2, the M-RAN may interact with the terminal device to instruct the terminal device to establish a session.

Specific implementation manners will be described in detail in subsequent embodiments (e.g., embodiments corresponding to fig. 4 to fig. 10), and are not described herein again.

The second problem is that: in the scheme, the user plane connections of the redundant session are guaranteed to be mutually independent through the RSN, but when the redundant session 1 corresponds to the SMF1 network element, the redundant session 2 corresponds to the SMF2 network element, and the SMF1 network element is different from the SMF2 network element, because the SMF1 network element and the SMF2 network element may not be able to communicate with each other, the SMF1 network element cannot sense how many RSN values are determined by the SMF2 network element, and it may happen that the RSN corresponding to the redundant session 1 is the same as the RSN corresponding to the redundant session 2, which results in that the user plane connections of the redundant session 1 and the redundant session 2 are no longer mutually independent, that is, the purpose of high reliability cannot be achieved.

Based on this, the communication method provided in the embodiments of the present application can carry different amounts of session identifier information in a session establishment request when the UE initiates the session establishment request, so that the network side can determine different redundant sequence numbers based on the number of session identifiers, thereby implementing independence of user plane connection between redundant sessions, and achieving a highly reliable effect. The specific implementation manner will be described in detail in the following embodiments (e.g., the embodiment corresponding to fig. 11), and will not be described herein again.

The method of the embodiment of the present application may be applied in Long Term Evolution (LTE), and may also be applied in a fifth Generation mobile communication (5Generation, 5G) system, or a future mobile communication system.

Fig. 3 is a schematic diagram of a network architecture provided in an embodiment of the present application. The architecture not only supports the access of the wireless technology (such as LTE, 5G Radio Access Network (RAN) and the like) defined by the third generation partnership project (3 GPP) standard group to the Core Network (CN), but also supports the access of the non-3GPP access technology to the core network through a non-3GPP switching function (N3 GPP interworking function, N3IWF) or a next generation access gateway (ngPDG).

The network architecture includes a terminal device, AN Access Network (AN), a core network, and a Data Network (DN). The terminal device can be a network terminal device, such as a mobile phone, an internet of things terminal device and the like; the access network device is mainly used for realizing functions of a wireless physical layer, resource scheduling, wireless resource management, wireless access control, mobility management and the like; the core network device may include a management device and a gateway device, the management device is mainly used for device registration, security authentication, mobility management, location management, and the like of the terminal device, the gateway device is mainly used for establishing a channel with the terminal device, and forwarding a data packet between the terminal device and an external data network on the channel; the data network may include network devices (e.g., servers, routers, etc.), and is mainly used for providing various data service services for the terminal devices. The description is given by taking an access network, a core network and a data network in 5G as examples.

The access network in the 5G may be a radio access network (R) AN, and the (R) AN device in the 5G system may be composed of a plurality of 5G- (R) AN nodes, and the 5G- (R) AN nodes may include: an access network of the 3GPP, an access network of the non-3GPP, such as an Access Point (AP) of a WiFi network, a next generation base station (which may be collectively referred to as a new generation radio access network node (NG-RAN node), where the next generation base station includes a new air interface base station (NR nodeB, gNB), a new generation evolved base station (NG-eNB), a Central Unit (CU), and a Distributed Unit (DU) in a separated form, such as a gNB, etc.), a Transmission Reception Point (TRP), a Transmission Point (TP), or other nodes.

The 5G core network (5G core/new generation core, 5GC/NGC) includes multiple functional units such as an access and mobility management function (AMF) network element, a Session Management Function (SMF) network element, a User Plane Function (UPF) network element, an authentication server function (AUSF) network element, a Policy Control Function (PCF) network element, an Application Function (AF) network element, a unified data management function (UDM) network element, a Network Slice Selection Function (NSSF) network element, a network function (network element) network element, and the like.

The AMF network element is mainly responsible for services such as mobility management, access management, and the like, such as user location update, user registration network, user handover, and the like. The SMF network element is mainly responsible for session management, dynamic host configuration protocol functions, selection and control of user plane functions, and the like, such as session establishment, modification and release. The specific functions include allocating an IP address to a user, selecting a UPF providing a message forwarding function, and the like. The UPF network element is mainly responsible for routing forwarding, message filtering, and performing quality of service (QoS) control related functions, such as forwarding and charging, of data packets externally connected to a Data Network (DN) and a user plane. The DN mainly provides services to the user equipment, such as providing mobile operator services, Internet services or third party services. The AUSF network element is mainly responsible for authentication functions of the terminal equipment and the like. The PCF network element is mainly responsible for providing a unified policy framework for network behavior management, providing policy rules for control plane functions, obtaining registration information related to policy decisions, and the like, such as QoS policies, slice selection policies, and the like. It should be noted that these functional units may work independently, or may be combined together to implement some control functions, such as access control and mobility management functions for access authentication, security encryption, location registration, etc. of the terminal device, and session management functions for establishment, release, and modification of a user plane transmission path, etc. The UDM network element is a unified user data management and is mainly used for storing user equipment subscription data, such as subscription information and authentication/authorization information; the AF network element is responsible for providing service-related information to the 3GPP network, such as for influencing service routing, interacting with PCF for policy control, and the like.

The functional units in the 5G system may communicate with each other through a next generation Network (NG) interface, for example: the terminal equipment can transmit control plane information with the AMF network element through AN NG interface 1 (N1 for short), the RAN equipment can establish a user plane communication connection with a UPF through AN NG interface 3 (N3 for short) to establish a channel, the AN/RAN equipment can establish a control plane signaling connection with the AMF network element through AN NG interface 2 (N2 for short), the UPF can perform information interaction with the SMF network element through AN NG interface 4 (N4 for short), the UPF can interact user plane data with a data network DN through AN NG interface 6 (N6 for short), the AMF network element can perform information interaction with the SMF network element through AN NG interface 11 (N11 for short), the SMF network element can perform information interaction with the PCF network element through AN NG interface 7 (N7 for short), and the AMF network element can perform information interaction with the AUSF through AN NG interface 12 (N12 for short).

Some words of the embodiments of the present application are described below.

The session management network element described in this embodiment may be an SMF network element or another network element that implements a session management function, the user plane network element may be an UPF network element or another network element that implements a user plane function, the policy control network element may be a PCF network element or another network element that implements a policy control function, the application network element may be an AF network element or another network element that implements an application function, the network open network element may be an NEF network element or another network element that implements a network open function, and the mobility management network element may be an AMF network element or another network element that implements a mobility management function.

For convenience of description, in the following description, the session management network element is an SMF network element, the user plane network element is an UPF network element, the policy control network element is a PCF network element, the application network element is an AF network element, the network open network element is an NEF network element, and the mobility management network element is an AMF network element, which is not limited to the embodiment of the present application.

The first network element described in the embodiment of the present application may be a network element on a network side, for example, a radio access network device or a session management network element.

The radio access network device described in the embodiments of the present application may also be an M-RAN, an S-RAN, or the like.

The terminal device described in the embodiment of the present application has already established the first session, and has released or failed to establish the third session that is redundant to the first session, which can be understood as follows: the terminal device may trigger the establishment of the first session and the third session that are redundant to each other in any possible manner, and in a possible implementation in the process of establishing the redundant session, the establishment of the first session is successful, and the establishment of the third session is failed. In another possible implementation manner, both the first session and the third session are successfully established, but in the subsequent process, because the RAN resource cannot meet the requirement of redundant transmission, etc., the third session cannot be continuously maintained, and the third session is released by the network side.

The indication information described in the embodiments of the present application may be in the form of characters, numerical values, and the like.

In one possible implementation, the indication information may be used to indicate that the radio access network resources (or RAN resources, etc.) meet the requirement of redundant transmission.

In a possible implementation manner, the indication information may be used to indicate the terminal device to establish a redundant session, and the terminal device may establish a second session that is redundant with the first session when receiving the indication information.

In a possible implementation manner, in a case that the terminal device further receives the identification information of the first session, the indication information may be used to indicate the terminal device to establish a session that is redundant to the first session. The identification information of the first session may be sent to the terminal device by the device such as the first network element.

In a possible implementation manner, the indication information may be used to instruct the terminal device to establish the second session in the first time period. The first time period may be explicitly indicated, for example, the indication information includes time period information; the first time period may be implicit, e.g., the first time period may be a default time period, indicating that no time period information is included in the information. In case the first period of time is short, it may also be understood that the indication information is used to instruct the terminal device to set up the second session immediately (or as immediately, horse, etc.).

It should be noted that the indication information described in the embodiment of the present application is mainly used to indicate the function of the indication information, and the specific form of the indication information is not limited, and in the subsequent embodiments, the specific content of the indication information sent between different network elements may be different or may be the same.

In the embodiment of the present application, the terminal device may establish, according to the indication information, a second session that is redundant with the first session in any possible form, and for example, the terminal device may send a session establishment request to the SMF network element through the AMF network element, thereby establishing the second session.

The SMF network element corresponding to the second session may be the same as or different from the SMF network element corresponding to the third session, and the UPF network element corresponding to the second session may be the same as or different from the UPF network element corresponding to the third session.

In one possible implementation, the terminal device may determine attribute information (e.g., DNN, S-NSSAI, or a combination of DNN and S-NSSAI, etc.) of the second session according to a terminal policy (e.g., URSP or local configuration information, etc.); wherein the attribute information of the second session is correlated with the attribute information of the first session; the terminal equipment sends a session establishment request to a session management network element; wherein the session establishment request comprises attribute information of the second session. The attribute information of the second session is correlated with the attribute information of the first session, and it can be understood that the second session transfers the same data as the first session.

In a possible implementation manner, the terminal device may determine that the attribute information of the second session is the same as the attribute information of the third session; the attribute information of the third session is determined by the terminal device according to the terminal policy (for example, may be determined when the third session is established, and is not limited herein), or is received by the terminal device from the attribute information of the third session sent by the SMF network element. In a possible understanding, the attribute information of the third session may be assigned to the second session, so as to establish the second session that is redundant with the first session. Or it can be understood that when the third session is released, the terminal device still needs to store the attribute information of the third session.

The data transmission according to the embodiments of the present application may include processes of data transmission, data reception, or data interaction. For example, the data transmission between the terminal device and the UPF network element may include that the terminal device sends data to the UPF network element, or the UPF network element sends data to the terminal device, or the terminal device sends data to the UPF network element and receives data from the UPF network element, or the UPF network element sends data to the terminal device and receives data from the terminal device.

The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following embodiments may be implemented independently or in combination, and details of the same or similar concepts or processes may not be repeated in some embodiments.

Fig. 4 is a flowchart of a communication method according to an embodiment of the present application, where the method includes the following steps:

s401: the terminal equipment receives indication information from a first network element, wherein the indication information is used for indicating that the wireless access network resource meets the requirement of redundant transmission; the terminal device establishes a first session, and releases or fails to establish a third session which is redundant with the first session.

In this embodiment of the present application, a first network element on a network side may monitor a condition of a RAN resource, and when the first network element learns that the RAN resource satisfies a redundant transmission request (in a possible understanding, it may be considered that a radio access network resource satisfies a redundant transmission request again), the first network element may send, to a terminal device, indication information for indicating that the radio access network resource satisfies the redundant transmission request. The terminal device can clearly reestablish the time of the second session which is redundant with the first session, so that the resource waste caused by continuously sending the request for establishing the redundant session due to the fact that the terminal device cannot acquire the RAN resource can be avoided.

S402: the terminal equipment establishes a second session according to the indication information; the first session and the second session are redundant sessions of each other.

In this embodiment of the present application, the terminal device may trigger to establish the second session that is redundant to the first session in any possible manner, which is not specifically limited in this embodiment of the present application.

In summary, when detecting that the radio access network resource meets the redundant transmission requirement, the network side may send indication information to the terminal device, indicating that the radio access network resource meets the redundant transmission requirement, and the terminal device may establish the redundant session according to the indication information, so that a situation that the terminal initiates an invalid session establishment request due to the fact that the radio access network resource cannot meet the redundant transmission requirement may be avoided, and signaling resources may be saved.

On the basis of the embodiment corresponding to fig. 4, in a possible implementation manner, the first network element is a radio access network device, and fig. 5 illustrates a specific communication diagram in which the first network element is a radio access network device.

For example, as shown in fig. 5, the terminal device may establish a first session based on the SMF1 network element and the UPF1 network element, establish a third session based on the SMF2 network element and the UPF2 network element, where the third session is redundant with the first session, and after the session is established, the radio access network device RAN (e.g., M-RAN) detects that the RAN resources cannot meet the requirement of redundant transmission (or it may be understood that the RAN resources cannot meet the requirement of RSN, or DC cannot be maintained), the RAN may notify the SMF2 network element to release the third session, for example, the RAN sends a notification to the SMF2 network element, and the SMF2 network element decides to release the third session according to the notification. The following steps may be included subsequently:

s501: the radio access network device determines that the RAN resources re-satisfy the redundant transmission requirements.

In a possible implementation, the M-RAN may detect the RAN resource in real time, or periodically or aperiodically, so as to detect that the RAN resource satisfies the redundant transmission requirement again, and then may execute S502.

For example, the RAN may determine that there is a RAN2 that may provide radio resources for the terminal device to act as an S-RAN, e.g., the RAN may consider RAN resources to re-satisfy redundant transmission requirements by obtaining the load of surrounding RANs, measurement reports of UEs, etc., and determining that there is a moderately loaded, moderately signaled RAN 2.

Illustratively, the RAN may determine that the S-RAN resources are sufficient to meet the QoS requirements of URLLC traffic.

S502: and the wireless access network device sends indication information to the terminal equipment, and the indication information is used for indicating that the wireless access network resource meets the requirement of redundant transmission.

In this embodiment, the radio access network device may send the indication information to the terminal device through an access network layer signal. For example, the indication information is transmitted to the UE through AN AS layer (AN signaling).

S503: the terminal equipment establishes a second session according to the indication information; the first session and the second session are redundant sessions of each other.

In the embodiment of the application, when detecting that the wireless access network resources meet the redundant transmission requirement, the wireless access network device sends the indication information to the terminal equipment to indicate that the wireless access network resources meet the redundant transmission requirement, and the terminal equipment can establish the redundant session according to the indication information, so that the situation that the terminal initiates an invalid session establishment request due to the fact that the wireless access network resources cannot meet the redundant transmission requirement can be avoided, and signaling resources are saved.

On the basis of the embodiment corresponding to fig. 4, in a possible implementation manner, the first network element is an SMF network element, and fig. 6 illustrates a specific communication diagram in which the first network element is an SMF network element.

For example, as shown in fig. 6, the terminal device may establish a first session based on the SMF1 network element and the UPF1 network element, and establish a third session based on the SMF2 network element and the UPF2 network element, where the third session is redundant with the first session, and after the session is established, the radio access network apparatus RAN (e.g., M-RAN) detects that the RAN resources cannot meet the redundant transmission requirement (or may be understood that the RAN resources cannot meet the RSN requirement, or DC cannot be maintained), and the RAN may notify the SMF2 network element to release the third session. The following steps may be included subsequently:

s601: the radio access network device determines that the RAN resources re-satisfy the redundant transmission requirements.

Specifically, reference may be made to the description of S501, which is not described herein again.

S602: and the wireless access network device sends indication information to the AMF network element, and the indication information is used for indicating that the wireless access network resource meets the requirement of redundant transmission.

For example, the RAN may send an N2 message to the AMF network element, where the N2 message may carry N2SM info, and the N2 smiinfo carries indication information, and in a possible implementation, the N2 message may also carry identification information of the first session.

Alternatively, the indication information is illustratively carried in an N2 message.

S603: and the AMF network element sends indication information to the SMF network element, and the indication information is used for indicating that the radio access network resource meets the requirement of redundant transmission.

Illustratively, the AMF network element may call the service Nsmf _ pdusesion _ UpdateSMContextrequest of the SMF network element, carrying N2SM info.

In a possible implementation manner, the RAN may also send the indication information to the SMF network element by using other manners instead of sending the indication information to the SMF network element through the AMF network element, that is, S602 and S603 may be optional steps, which is not specifically limited in this embodiment of the present application.

S604: and the SMF network element sends indication information to the terminal equipment, and the indication information is used for indicating that the radio access network resource meets the requirement of redundant transmission.

In a possible implementation manner, the SMF network element may send a cause value (or may be understood as indicating information being a cause value) to the terminal device, so as to indicate that the radio access network resource meets the requirement of redundant transmission.

Illustratively, the SMF network element may send an Nsmf _ pdusesion _ UpdateSMContext response, carrying N1SM container, to the AMF network element. Where N1SM container carries the cause value. In a possible implementation, N1SM container may also carry identification information of the first session.

The AMF network element may forward the cause value to the terminal device. In a possible implementation, the AMF network element may forward the identification information of the first session to the terminal device.

It should be noted that, the indication information sent by the radio access network device to the AMF network element, the indication information sent by the AMF network element to the SMF network element, and the indication information sent by the AMF network element to the SMF network element may be in the same form or different forms, and this is not specifically limited in this embodiment of the present application.

S605: the terminal equipment establishes a second session according to the indication information; the first session and the second session are redundant sessions of each other.

In the embodiment of the application, when detecting that the radio access network resource meets the redundant transmission requirement, the radio access network device sends the indication information to the session management network element, and then the session management network element sends the indication information to the terminal device to indicate that the radio access network resource meets the redundant transmission requirement, and the terminal device can establish the redundant session according to the indication information, so that the situation that the terminal initiates an invalid session establishment request due to the fact that the radio access network resource cannot meet the redundant transmission requirement can be avoided, and signaling resources are saved.

On the basis of the embodiment corresponding to fig. 4, in a possible implementation manner, the first network element is an SMF network element, and fig. 7 illustrates a specific communication diagram in which the first network element is an SMF network element.

For example, as shown in fig. 7, the terminal device may establish a first session based on the SMF1 network element and the UPF1 network element, and establish a third session based on the SMF2 network element and the UPF2 network element, where the third session is redundant with the first session, and after the session is established, the radio access network apparatus RAN (e.g., M-RAN) detects that the RAN resources cannot meet the redundant transmission requirement (or may be understood that the RAN resources cannot meet the RSN requirement, or DC cannot be maintained), and the RAN may notify the SMF2 network element to release the third session. The following steps may be included subsequently:

s701: the radio access network device determines that the RAN resources re-satisfy the redundant transmission requirements.

S702: and the wireless access network device sends indication information to the AMF network element, and the indication information is used for indicating that the wireless access network resource meets the requirement of redundant transmission.

S703: and the AMF network element sends indication information to the SMF network element, and the indication information is used for indicating that the radio access network resource meets the requirement of redundant transmission.

S704: the SMF network element sends first indication information to the terminal equipment, and the first indication information is used for indicating that the redundant session is established.

S705: the terminal equipment establishes a second session according to the indication information; the first session and the second session are redundant sessions of each other.

S701, S702, S703, and S705 in the embodiment of the present application may correspond to the descriptions of S601, S602, S603, and S605 in fig. 6, and are not described again. Unlike the embodiment of fig. 6, in the embodiment corresponding to fig. 7, in S704, the indication information is used to instruct the terminal device to establish a redundant session.

In the embodiment of the application, when detecting that the radio access network resources meet the redundant transmission requirement, the radio access network device sends the indication information to the session management network element to indicate that the radio access network resources meet the redundant transmission requirement, and then the session management network element sends the indication information to the terminal equipment to indicate the terminal equipment to establish the session, so that the situation that the terminal initiates an invalid session establishment request due to the fact that the radio access network resources cannot meet the redundant transmission requirement can be avoided, and signaling resources are saved.

Fig. 8 is a flowchart of a communication method according to an embodiment of the present application, where the method includes the following steps:

s801: the terminal equipment receives indication information from the first network element, wherein the indication information is used for indicating the terminal equipment to establish a redundant session; the terminal device establishes a first session, and releases or fails to establish a third session which is redundant with the first session.

S802: the terminal equipment establishes a second session according to the indication information; the first session and the second session are redundant sessions of each other.

S802 in the embodiment of the present application may correspond to the record of S402 in fig. 4, and is not described again. Unlike the embodiment of fig. 4, in the embodiment corresponding to fig. 8, in S801, the indication information is used to instruct the terminal device to establish a redundant session.

In the embodiment of the application, when detecting that the wireless access network resources meet the redundant transmission requirement, the network side can send the indication information to the terminal equipment to indicate the terminal equipment to establish the session, so that the condition that the terminal initiates an invalid session establishment request due to the fact that the wireless access network resources cannot meet the redundant transmission requirement can be avoided, and signaling resources are saved.

On the basis of the embodiment corresponding to fig. 8, in a possible implementation manner, the first network element is a radio access network device, and fig. 9 illustrates a specific communication diagram in which the first network element is a radio access network device. The method comprises the following steps:

s901: the radio access network device determines that the RAN resources re-satisfy the redundant transmission requirements.

S902: and the wireless access network device sends indication information to the terminal equipment, and the indication information is used for indicating the terminal equipment to establish the redundant session.

S903: the terminal equipment establishes a second session according to the indication information; the first session and the second session are redundant sessions of each other.

S901 and S903 in the embodiment of the present application may correspond to the descriptions of S501 and S503 in fig. 5, and are not described again. Unlike the embodiment of fig. 5, in the embodiment corresponding to fig. 9, in S902, the indication information is used to instruct the terminal device to establish a redundant session.

In the embodiment of the application, when detecting that the wireless access network resources meet the redundant transmission requirement, the wireless access network device sends the indication information to the terminal equipment to indicate the terminal equipment to establish the session, so that the condition that the terminal initiates an invalid session establishment request due to the fact that the wireless access network resources cannot meet the redundant transmission requirement can be avoided, and signaling resources are saved.

On the basis of the embodiment corresponding to fig. 8, in a possible implementation manner, the first network element is an SMF network element, and fig. 10 illustrates a specific communication diagram in which the first network element is an SMF network element.

S1001: the radio access network device determines that the RAN resources re-satisfy the redundant transmission requirements.

S1002: and the wireless access network device sends indication information to the AMF network element for indicating the terminal equipment to establish the redundant session.

S1003: and the AMF network element sends indication information to the SMF network element, and the indication information is used for indicating the terminal equipment to establish the redundant session.

S1004: and the SMF network element sends indication information to the terminal equipment, and the indication information is used for indicating the terminal equipment to establish the redundant session.

S1005: the terminal equipment establishes a second session according to the indication information; the first session and the second session are redundant sessions of each other.

S1001 and S1005 in the embodiment of the present application may correspond to the descriptions of S601 and S6005 in fig. 6, and are not described again. Unlike the embodiment of fig. 6, in the embodiment corresponding to fig. 10, in S1002 to S1004, the indication information is used to instruct the terminal device to establish a redundant session.

In the embodiment of the application, when detecting that the radio access network resources meet the redundant transmission requirement, the radio access network device sends the indication information to the session management network element, and then the session management network element sends the indication information to the terminal equipment to indicate the terminal equipment to establish the session, so that the situation that the terminal initiates an invalid session establishment request due to the fact that the radio access network resources cannot meet the redundant transmission requirement can be avoided, and signaling resources are saved.

Fig. 11 is a flowchart of a communication method according to an embodiment of the present application, where the method includes the following steps:

s1101: the session management network element receives a session establishment request from the terminal device for establishing the first session.

For example, the UE may send a session establishment request to the SMF network element, where the session establishment request may carry identification information of the first session, attribute information of the first session (e.g., (DNN, S-NSSAI) -a), and the like.

Optionally, the session establishment request may also carry identification information of the second session.

S1102: the session management network element determines that the first session is a redundant session.

For example, the SMF network element may determine that the first session is a redundant session according to one or more of attribute information of the first session, a policy from the PCF network element, a local policy of the SMF network element, subscription data of the UE, and the like, which are carried in the session establishment request.

S1103: the session management network element determines a redundant sequence number for the first session according to the session establishment request; when the session establishment request includes identification information of a session, the session establishment request only includes identification information of a first session, and the redundant sequence number is a first value; under the condition that the session establishment request comprises the identification information of the first session and the identification information of the second session, the redundancy sequence number is a second value; the first value is different from the second value; the first session and the second session are redundant sessions with each other.

In the embodiment of the present application, the first value may be a character, a number, or the like, and the second value may be a character, a number, or the like. The second session may be a session redundant to the first session, and the second session may be established synchronously or asynchronously with the first session, which is not specifically limited in this embodiment of the present application.

In this embodiment of the application, the session establishment request includes identification information of one session, which may be understood as that, for the identification information of the session, the session establishment request includes identification information of only one session (for example, identification information of a first session), and in the case that the session establishment request includes identification information of one session, the redundant sequence number is a first value. Of course, the session establishment request may further include other information besides the identification information of the session, and the application is not limited thereto.

In a possible implementation, the first value may be associated with identification information of the first session.

In this embodiment of the application, the session establishment request includes identification information of the first session and identification information of the second session, and may be understood that the session establishment request of the first session includes not only an identification of the first session, but also identification information of the second session that is redundant with the first session (the identification information of the second session may also be understood as associated information), and when the session establishment request includes the identification information of the first session and the identification information of the second session, the redundant sequence number is a second value.

In a possible implementation, the second value may be associated with identification information of the first session and identification information of the second session.

In a possible implementation manner, when a first session and a second session that are redundant to each other are established in the embodiment of the present application, in a manner that a session establishment request of the first session carries identification information of one session and a session establishment request of the second session carries identification information of the first session and identification information of the second session, an SMF network element (an SMF network element corresponding to the first session and an SMF network element corresponding to the second session may be the same or different) may determine a redundant sequence number for the first session as a first value and determine a redundant sequence number for the second session as a second value for the first session and the second session, and because the first value and the second value are different, different UPF network elements may be subsequently accessed for the first session and the second session, so that an effect of high reliability of user plane path transmission may be achieved.

In a possible implementation manner, when a first session and a second session that are redundant to each other are established in the embodiment of the present application, in a manner that a session establishment request of the second session carries identification information of one session, and a session establishment request of the first session carries identification information of the first session and identification information of the second session, an SMF network element (an SMF network element corresponding to the first session and an SMF network element corresponding to the second session may be the same or different) may determine, for the second session, a redundant sequence number as a first value, and determine, for the first session, a redundant sequence number as a second value, and because the first value and the second value are different, different UPF network elements may be subsequently accessed for the first session and the second session, so that an effect of high reliability of user plane path transmission may be achieved.

S1104: and the session management network element sends the redundant serial number to the wireless access network device.

Illustratively, the SMF network element may send the redundant sequence number to the RAN through the AMF network element.

To sum up, in the embodiment of the present application, when a terminal device initiates a session establishment request, session identification information of different quantities may be carried in the session establishment request, so that a network side may determine different redundant sequence numbers based on the quantity of the session identifications, thereby implementing independence of user plane connection between redundant sessions, and achieving a highly reliable effect.

It should be noted that the embodiment corresponding to fig. 11 may be applied to the session establishment procedures in fig. 4 to fig. 10, and is not described herein again.

In a possible implementation manner, when the embodiment corresponding to fig. 11 may be applied to the session establishment processes in fig. 4 to fig. 10, the number of session identification information included in the session establishment request during second session establishment may be further determined in combination with the number of session identification information included in the session establishment request during first session establishment.

For example, in a case that it is determined that the number of session identification information included in the session establishment request at the time of establishing the first session is one (for example, identification information of the first session), identification information of two sessions (for example, identification information of the first session and identification information of the second session) may be included in the session establishment request at the time of establishing the second session, so that redundant sequence numbers of the first session and the second session may be different, and independence of user plane connection between redundant sessions may be achieved, thereby achieving a highly reliable effect.

For example, in a case that it is determined that the number of session identification information included in the session establishment request at the time of establishing the first session is two (for example, the identification information of the first session and the identification information of the third session), the session establishment request at the time of establishing the second session may include identification information of one session (for example, the identification information of the second session), so that the redundant sequence numbers of the first session and the second session may be different, and the user plane connection between the redundant sessions may be independent, thereby achieving a highly reliable effect.

The method of the embodiment of the present application is described above with reference to fig. 4 to 11, and a communication apparatus provided in the embodiment of the present application for performing the method is described below. Those skilled in the art will appreciate that the methods and apparatuses may be combined and referred to one another, and a communication apparatus provided in the embodiments of the present application may perform the steps performed by the radio access network apparatus in the above communication method. Another communication device may perform the steps performed by the session management network element in the communication method in the above embodiment. Still another communication apparatus may perform the steps performed by the terminal device in the communication method in the above embodiment.

The following description will be given by taking the division of each function module corresponding to each function as an example:

as shown in fig. 12, fig. 12 is a schematic structural diagram of a communication device provided in this embodiment of the present application, where the communication device may be a terminal device, a radio access network device, or a session management network element in this embodiment of the present application, and may also be a chip applied to the terminal device, the radio access network device, or the session management network element. The communication device includes: a processing unit 101 and a communication unit 102. The communication unit 102 is used to support the communication device to perform the steps of information transmission or reception. The processing unit 101 is used to support the communication device to perform the steps of information processing.

An example, taking the communication apparatus as a terminal device or a chip system applied in the terminal device as an example, the communication unit 102 is used to support the communication apparatus to execute S401 or S801 or the like in the above-mentioned embodiment, and the processing unit 101 is used to support the communication apparatus to execute S402 or S802 or the like in the above-mentioned embodiment.

For another example, taking the communication device as a radio access network device or a chip system applied in the radio access network device as an example, the communication unit 102 is configured to support the communication device to perform step S401 or S801 in the above embodiments. The processing unit 101 is configured to support the communication apparatus to execute S501, S601, S701, S901, S1001, and the like in the above-described embodiments.

As another example, taking the communication apparatus as a session management network element or a chip or chip system applied in the session management network element as an example, the communication unit 102 is configured to support the communication apparatus to perform S401 and S402, or S801 and S802, or S1101 and S1104, and the like in the foregoing embodiments. The processing unit 101 is configured to support the communication apparatus to execute S1102, S1103, and the like in the above-described embodiments.

In one possible embodiment, the communication device may further include: a memory cell 103. The processing unit 101, the communication unit 102, and the storage unit 103 are connected via a communication bus.

The storage unit 103 may include one or more memories, which may be devices in one or more devices or circuits for storing programs or data.

The storage unit 103 may be independent and connected to the processing unit 101 provided in the communication apparatus via a communication bus. The memory unit 103 may also be integrated with the processing unit.

The communication means may be used in a communication device, circuit, hardware component or chip.

Taking as an example that the communication device may be a chip or a chip system of a terminal device, a radio access network device, or a session management network element in the embodiments of the present application, the communication unit 102 may be an input or output interface, pin, or circuit. For example, the storage unit 103 may store computer-executable instructions of a method of a terminal device, a radio access network device, or a session management network element side, so that the processing unit 101 executes the method of the terminal device, the radio access network device, or the session management network element side in the foregoing embodiments. The storage unit 103 may be a register, a cache, a RAM, or the like, and the storage unit 103 may be integrated with the processing unit 101. The memory unit 103 may be a ROM or other type of static storage device that may store static information and instructions, and the memory unit 103 may be separate from the processing unit 101.

The present embodiment provides a communication apparatus, which includes one or more modules for implementing the method in the steps included in fig. 4 to 11, where the one or more modules may correspond to the steps of the method in the steps included in fig. 4 to 11. Specifically, in each step of the method executed by the session management network element in the embodiment of the present application, a unit or a module for executing each step of the method exists in the session management network element. Each step of the method is performed by a radio access network device in which there is an element or module that performs each step of the method. Each step of the method is performed by a terminal device in which there are units or modules performing each step of the method. For example, a module that controls or processes an operation of the communication apparatus may be referred to as a processing module. A module for performing a step of processing a message or data on the communication apparatus side may be referred to as a communication module.

Fig. 13 is a schematic diagram illustrating a hardware structure of a communication device according to an embodiment of the present application. The hardware structure of the radio access network device or the session management network element in the embodiment of the present application may refer to the hardware structure diagram of the communication device shown in fig. 13. The communication device comprises a processor 41, a communication line 44 and at least one communication interface (illustrated exemplarily by the communication interface 43 in fig. 13).

Processor 41 may be a general-purpose Central Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more ics for controlling the execution of programs in accordance with the teachings of the present disclosure.

The communication link 44 may include a path for transmitting information between the aforementioned components.

The communication interface 43 may be any device, such as a transceiver, for communicating with other devices or communication networks, such as an ethernet, a Radio Access Network (RAN), a Wireless Local Area Network (WLAN), etc.

Possibly, the communication device may further comprise a memory 42.

The memory 42 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that may store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that may store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be separate and coupled to the processor via a communication line 44. The memory may also be integral to the processor.

The memory 42 is used for storing computer-executable instructions for executing the present application, and is controlled by the processor 41 to execute. The processor 41 is configured to execute computer-executable instructions stored in the memory 42, so as to implement the policy control method provided by the following embodiments of the present application.

Possibly, the computer executed instructions in the embodiments of the present application may also be referred to as application program codes, which are not specifically limited in the embodiments of the present application.

In particular implementations, processor 41 may include one or more CPUs such as CPU0 and CPU1 in fig. 13, for example, as one embodiment.

In particular implementations, the communication device may include multiple processors, such as processor 41 and processor 45 in fig. 13, as one embodiment. Each of these processors may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

Fig. 14 is a schematic structural diagram of a terminal device (hereinafter referred to as a terminal) according to an embodiment of the present application.

The terminal includes at least one processor 1211, at least one transceiver 1212. In one possible example, the terminal can also include and at least one memory 1213, an output device 1214, an input device 1215, and one or more antennas 1216. The processor 1211, the memory 1213 and the transceiver 1212 are coupled. An antenna 1216 is coupled to the transceiver 1212, and an output device 1214 and an input device 1215 are coupled to the processor 1211.

The memory in the embodiment of the present application, for example, the memory 1213, may include at least one of the following types: read-only memory (ROM) or other types of static memory devices that may store static information and instructions, Random Access Memory (RAM) or other types of dynamic memory devices that may store information and instructions, and Electrically erasable programmable read-only memory (EEPROM). In some scenarios, the memory may also be, but is not limited to, a compact disk-read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.

The memory 1213 may be separate and coupled to the processor 1211. In another example, the memory 1213 may also be integrated with the processor 1211, such as within a single chip. The memory 1213 can store program codes for executing the technical solutions of the embodiments of the present application, and is controlled by the processor 1211 to execute, and various executed computer program codes can also be regarded as drivers of the processor 1211. For example, the processor 1211 is configured to execute the computer program code stored in the memory 1213, so as to implement the technical solution in the embodiment of the present application.

The transceiver 1212 may be used to support the reception or transmission of radio frequency signals between the terminal and the terminal or between the terminal and the access device, and the transceiver 1212 may be connected to the antenna 1216. The transceiver 1212 includes a transmitter Tx and a receiver Rx. Specifically, one or more antennas 1216 may receive a radio frequency signal, and a receiver Rx of the transceiver 1212 is configured to receive the radio frequency signal from the antennas, convert the radio frequency signal into a digital baseband signal or a digital intermediate frequency signal, and provide the digital baseband signal or the digital intermediate frequency signal to the processor 1211, so that the processor 1211 performs further processing on the digital baseband signal or the digital intermediate frequency signal, such as demodulation processing and decoding processing. In addition, the transmitter Tx in the transceiver 1212 is also used to receive a modulated digital baseband signal or a digital intermediate frequency signal from the processor 1211, convert the modulated digital baseband signal or the digital intermediate frequency signal into a radio frequency signal, and transmit the radio frequency signal through the one or more antennas 1216. Specifically, the receiver Rx may selectively perform one or more stages of down-mixing and analog-to-digital conversion on the rf signal to obtain a digital baseband signal or a digital intermediate frequency signal, and the sequence of the down-mixing and analog-to-digital conversion is adjustable. The transmitter Tx may selectively perform one or more stages of up-mixing and digital-to-analog conversion on the modulated digital baseband signal or the modulated digital intermediate frequency signal to obtain the rf signal, and the sequence of the up-mixing and the digital-to-analog conversion is adjustable. The digital baseband signal and the digital intermediate frequency signal may be collectively referred to as a digital signal.

The processor 1211 may be a baseband processor or a CPU, and the baseband processor and the CPU may be integrated together or separated.

The processor 1211 may be used to implement various functions for the terminal, such as processing a communication protocol and communication data, or controlling the entire terminal device, executing a software program, processing data of the software program; or to assist in completing computational processing tasks, such as processing of graphical images or audio, etc.; or processor 1211 may be used to perform one or more of the functions described above

The output device 1214 is in communication with the processor 1211 and may display information in a variety of ways. For example, the output device 1214 may be a Liquid Crystal Display (LCD), a Light Emitting Diode (LED) Display device, a Cathode Ray Tube (CRT) Display device, a projector (projector), or the like. The input device 1215 is in communication with the processor 1211 and may accept user input in a variety of ways. For example, the input device 1215 can be a mouse, a keyboard, a touch screen device, or a sensing device, among others.

Specifically, the at least one processor 1211 is configured to perform S406. At least one transceiver 1212 is used to perform S401 and S405.

Fig. 15 is a schematic structural diagram of a chip 150 according to an embodiment of the present invention. Chip 150 includes one or more (including two) processors 1510 and a communication interface 1530.

In one possible embodiment, chip 150 as shown in FIG. 15 also includes memory 1540, which may include both read-only memory and random access memory, and provides operating instructions and data to processor 1510. A portion of memory 1540 may also include non-volatile random access memory (NVRAM).

In some embodiments, memory 1540 stores the following elements, executable modules or data structures, or a subset thereof, or an expanded set thereof:

in the embodiment of the present invention, by calling an operation instruction stored in the memory 1540 (the operation instruction may be stored in an operating system), a corresponding operation is performed.

One possible implementation is: the chips used by the terminal equipment, the radio access network device or the session management network element have similar structures, and different devices may use different chips to implement their respective functions.

The processor 1510 controls the operation of the terminal device, the radio access network apparatus, or the session management network element, and the processor 1510 may also be referred to as a Central Processing Unit (CPU). Memory 1540 can include both read-only memory and random-access memory, and provides instructions and data to processor 1510. A portion of memory 1540 may also include non-volatile random access memory (NVRAM). For example, in an application where memory 1540, communications interface 1530 and memory 1540 are coupled together by bus system 1520, where bus system 1520 may include a power bus, control bus, status signal bus, etc. in addition to a data bus. For clarity of illustration, however, the various buses are labeled in fig. 15 as bus system 1520.

The above communication unit may be an interface circuit or a communication interface of the apparatus for receiving signals from other apparatuses. For example, when the device is implemented in the form of a chip, the communication unit is an interface circuit or a communication interface for the chip to receive signals from or transmit signals to other chips or devices.

The method disclosed in the above embodiments of the present invention may be applied to the processor 1510 or implemented by the processor 1510. The processor 1510 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by instructions in the form of hardware, integrated logic circuits, or software in the processor 1510. The processor 1510 may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, or discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 1540, and the processor 1510 reads the information in the memory 1540, and performs the steps of the above method in combination with the hardware thereof.

In a possible implementation, communication interface 1530 is used to perform the steps of receiving and sending of terminal equipment, radio access network devices or session management network elements in the embodiments shown in fig. 4-11. The processor 1510 is configured to perform the steps of the processing of the terminal device, the radio access network apparatus or the session management network element in the embodiments shown in fig. 4-11.

In the above embodiments, the instructions stored by the memory for execution by the processor may be implemented in the form of a computer program product. The computer program product may be written in the memory in advance or may be downloaded in the form of software and installed in the memory.

The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the present application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, e.g., the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. A computer-readable storage medium may be any available medium that a computer can store or a data storage device including one or more available media integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The embodiment of the application also provides a computer readable storage medium. The methods described in the above embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media may include computer storage media and communication media, and may include any medium that can communicate a computer program from one place to another. A storage medium may be any target medium that can be accessed by a computer.

As one possible design, a computer-readable medium may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that is targeted for carriage or that stores desired program code in the form of instructions or data structures and that is accessible by a computer. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

The embodiment of the application also provides a computer program product. The methods described in the above embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. If implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions described in the above method embodiments are generated in whole or in part when the above computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a computer network, a base station, a terminal, or other programmable device.

The above embodiments are only for illustrating the embodiments of the present invention and are not to be construed as limiting the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the embodiments of the present invention shall be included in the scope of the present invention.

It should be noted that, in a specific application, each network element in this embodiment may also adopt other definitions or names, for example, an SMF network element may be referred to as a first core network element, a UPF network element may be referred to as a second core network element, a PCF network element may be referred to as a third core network element, and an AMF network element may be referred to as a fourth core network element. Alternatively, the network elements may also be collectively referred to as core network elements. Or, other names may be defined by the network elements according to actual functions, and this is not specifically limited in this embodiment of the application.

Claims

1. A method of communication, comprising:

the terminal equipment receives indication information from the first network element; the indication information is used for indicating that the wireless access network resource meets the requirement of redundant transmission;

the terminal equipment establishes a second session according to the indication information; the terminal equipment establishes a first session, and releases or fails to establish a third session which is redundant with the first session; the first session and the second session are redundant sessions of each other.

2. The method of claim 1, wherein the terminal device receives indication information from the first network element, and wherein the indication information comprises:

and the terminal equipment receives the indication information from the wireless access network device.

3. The method of claim 1, wherein the terminal device receives indication information from the first network element, and wherein the indication information comprises:

and the terminal equipment receives the indication information from the session management network element.

4. The method according to any one of claims 1-3, wherein the terminal device establishes the second session according to the indication information, including:

and the terminal equipment establishes the second session in a first time period according to the indication information.

5. The method according to any one of claims 1-3, further comprising:

the terminal equipment receives the identification information of the first session;

the indication information is used for indicating the terminal equipment to establish the session in which the first sessions are redundant with each other.

6. The method according to any one of claims 1 to 5, wherein the terminal device establishes the second session according to the indication information, including:

the terminal equipment determines attribute information of the second session according to a terminal strategy; wherein the attribute information of the second session is correlated with the attribute information of the first session;

the terminal equipment sends a session establishment request to a session management network element; wherein the session establishment request includes attribute information of the second session.

7. The method of claim 6, wherein the determining, by the terminal device, the attribute information of the second session according to the terminal policy comprises:

the terminal equipment determines that the attribute information of the second session is the same as the attribute information of the third session; and the attribute information of the third session is determined by the terminal equipment according to the terminal strategy.

8. A method of communication, comprising:

the wireless access network device detects that the wireless access network resource meets the redundant transmission requirement;

the wireless access network device sends indication information to terminal equipment, wherein the indication information is used for indicating that the wireless access network resource meets the requirement of redundant transmission; the terminal device establishes a first session, and releases or fails to establish a third session which is redundant with the first session.

9. The method of claim 8, wherein the radio access network apparatus sends the indication information to the terminal device, and wherein the sending comprises:

the wireless access network device sends the indication information to the terminal equipment through a session management network element;

or, the radio access network device sends the indication information to the terminal equipment through an access network layer signal;

or, the radio access network device sends the indication information to a session management network element, and the session management network element is configured to indicate to the terminal device to establish a redundant session according to the indication information.

10. The method according to claim 8 or 9, wherein the indication information is used to instruct the terminal device to establish a second session in a first time period, and the first session and the second session are redundant sessions.

11. The method according to any of claims 8-10, wherein the indication information is used to instruct the terminal device to establish a second session that is redundant to the first session; the identification information of the first session is sent to the terminal device by the first network element.

12. A method of communication, comprising:

a session management network element receives indication information from a wireless access network device, wherein the indication information is used for indicating that wireless access network resources meet the requirement of redundant transmission;

the session management network element instructs the terminal equipment to establish a second session according to the indication information; the terminal equipment establishes a first session, and releases or fails to establish a third session which is redundant with the first session; the first session and the second session are redundant sessions of each other.

13. The method of claim 12, further comprising:

the session management network element receives a session establishment request from the terminal equipment; wherein the session establishment request includes attribute information of the second session, and the attribute information of the second session is the same as the attribute information of the third session.

14. A method of communication, comprising:

a session management network element receives a session establishment request for establishing a first session from a terminal device;

the session management network element determines that the first session is a redundant session;

the session management network element determines a redundant sequence number for the first session according to the session establishment request; wherein, under the condition that the session establishment request includes identification information of a session, the redundancy sequence number is a first value; under the condition that the session establishment request comprises the identification information of the first session and the identification information of the second session, the redundancy sequence number is a second value; the first value is different from the second value; the first session and the second session are redundant sessions;

and the session management network element sends the redundant serial number to a wireless access network device.

15. The method of claim 14, wherein determining, by the session management network element, a redundant sequence number for the first session based on the session establishment request comprises:

and under the condition that the session establishment request comprises identification information of one session, the session management network element determines the redundant sequence number according to the identification information of the first session.

16. A communication apparatus, comprising a communication unit and a processing unit;

the communication unit is used for receiving indication information from a first network element; the indication information is used for indicating that the wireless access network resource meets the requirement of redundant transmission;

the processing unit is used for establishing a second session according to the indication information; wherein the communication device has established a first session and a third session that is redundant to the first session has been released or failed to be established; the first session and the second session are redundant sessions of each other.

17. The apparatus according to claim 16, wherein the communication unit is specifically configured to receive the indication information from a radio access network apparatus.

18. The apparatus according to claim 16, wherein the communication unit is specifically configured to receive the indication information from a session management network element.

19. The apparatus according to any of claims 16-18, wherein the processing unit is specifically configured to establish the second session within a first time period according to the indication information.

20. The apparatus according to any one of claims 16 to 18,

the communication unit is further used for receiving the identification information of the first session;

the indication information is used for indicating the processing unit to establish the sessions in which the first sessions are redundant with each other.

21. The apparatus according to any one of claims 16 to 20, wherein the processing unit is specifically configured to determine attribute information of the second session according to a terminal policy; wherein the attribute information of the second session is correlated with the attribute information of the first session;

the communication unit is further configured to send a session establishment request to a session management network element; wherein the session establishment request includes attribute information of the second session.

22. The apparatus according to claim 21, wherein the processing unit is specifically configured to determine that the attribute information of the second session is the same as the attribute information of the third session; the attribute information of the third session is determined by the processing unit according to the terminal policy.

23. A communication apparatus, comprising a processing unit and a communication unit;

the processing unit is used for detecting that the wireless access network resource meets the requirement of redundant transmission;

the communication unit is configured to send indication information to a terminal device, where the indication information is used to indicate that the radio access network resource meets a redundant transmission requirement; the terminal device establishes a first session, and releases or fails to establish a third session which is redundant with the first session.

24. The apparatus according to claim 23, wherein the communication unit is specifically configured to: sending the indication information to the terminal equipment through a session management network element;

or, the indication information is sent to the terminal equipment through an access network layer signal;

or, the indication information is sent to a session management network element, and the session management network element is configured to indicate to the terminal device to establish a redundant session according to the indication information.

25. The apparatus according to claim 23 or 24, wherein the indication information is used to instruct the terminal device to establish a second session in a first time period, and the first session and the second session are redundant sessions.

26. The apparatus according to any of claims 23-25, wherein the indication information is used to instruct the terminal device to establish a second session that is redundant to the first session; the identification information of the first session is sent to the terminal device by the first network element.

27. A communication apparatus, comprising a communication unit and a processing unit;

the communication unit is configured to receive indication information from a radio access network apparatus, where the indication information is used to indicate that radio access network resources meet a redundant transmission requirement;

the processing unit is used for indicating the terminal equipment to establish a second session according to the indication information; the terminal equipment establishes a first session, and releases or fails to establish a third session which is redundant with the first session; the first session and the second session are redundant sessions of each other.

28. The apparatus of claim 27,

the communication unit is further used for receiving a session establishment request from the terminal equipment; wherein the session establishment request includes attribute information of the second session, and the attribute information of the second session is the same as the attribute information of the third session.

29. A communication apparatus, comprising a communication unit and a processing unit;

the communication unit is used for receiving a session establishment request for establishing a first session from the terminal equipment;

the processing unit is configured to determine that the first session is a redundant session;

the processing unit is further configured to determine a redundant sequence number for the first session according to the session establishment request; wherein, under the condition that the session establishment request includes identification information of a session, the redundancy sequence number is a first value; under the condition that the session establishment request comprises the identification information of the first session and the identification information of the second session, the redundancy sequence number is a second value; the first value is different from the second value; the first session and the second session are redundant sessions;

the communication unit is further configured to send the redundant sequence number to a radio access network device.

30. The apparatus according to claim 29, wherein the processing unit is specifically configured to, when the session establishment request includes identification information of one session, determine, by the session management network element, the redundant sequence number according to the identification information of the first session.

31. A communications apparatus, comprising: a processor and a communication interface;

wherein the communication interface is configured to perform messaging in the communication method according to any one of claims 1 to 7, or to perform messaging in the communication method according to any one of claims 8 to 11, or to perform messaging in the communication method according to any one of claims 12 to 13, or to perform messaging in the communication method according to any one of claims 14 to 15; the processor executes instructions to perform operations for processing or control in a communication method according to any one of claims 1 to 7, or to perform operations for processing or control in a communication method according to any one of claims 8 to 11, or to perform operations for processing or control in a communication method according to any one of claims 12 to 13, or to perform operations for processing or control in a communication method according to any one of claims 14 to 15.

32. A chip comprising at least one processor and a communication interface, the communication interface being coupled to the at least one processor, the at least one processor being configured to execute a computer program or instructions to implement the communication method of any one of claims 1-7, or to implement the communication method of any one of claims 8-11, or to implement the communication method of any one of claims 12-13, or to implement the communication method of any one of claims 14-15; the communication interface is used for communicating with other modules except the chip.

33. A computer-readable storage medium, having stored therein instructions that, when executed, implement a communication method according to any one of claims 1-7, or implement a communication method according to any one of claims 8-11, or implement a communication method according to any one of claims 12-13, or implement a communication method according to any one of claims 14-15.

34. A communication system, characterized in that the communication system comprises at least one of a communication device according to any of claims 16-22, a communication device according to any of claims 23-26, a communication device according to any of claims 27-28 or a communication device according to any of claims 29-30.