CN101247255B - A method and system for handling faults - Google Patents

Abstract

The invention discloses a method for processing failures, the method is as follows: a first network node determines that a failure occurs in a second network node; the first network node performs a corresponding processing flow according to the wireless access system where the second network node is located , using this processing flow to separate the user terminal that has established a user plane context on the second network node from the second network node, or transfer the user terminal to another network node. In this way, when a network node fails, the communication context of the corresponding user terminal can be effectively transferred, so that other network nodes can automatically take over the user terminal, so that the user terminal can normally initiate a service process. The invention simultaneously discloses a communication device and a communication system.

Description

A method and system for handling faults

technical field

The present invention relates to the communication field, in particular to a method, device and system for handling faults in an evolutionary network.

Background technique

Multiple radio access systems (RAT systems) with different radio access technologies coexist in the existing evolved network architecture, as shown in FIG. ), the evolved packet core network (Evolved Packet Core, EPC) belonging to the System Architecture Evolution (SAE), and the legacy general wireless communication system/general packet GPRS core network (GPRS Core) of wireless service (UMTS/GPRS) network, GSM EDGE radio access network (GSM EDGE Radio Access Network, GERAN) and UMTS (terrestrial radio access network UMTS Terrestrial Radio Access Network, UTRAN).

As shown in Figure 1, the function of the mobility management entity (Mobility Management Entity, MME) in the EPC is to store the user plane context of the user equipment (UE), such as user identification, mobility management status, tracking area information, etc., and to UE Authentication; the function of the user plane entity (User Plane Entity, UPE) is to terminate the downlink data of the UE in the idle state, trigger paging at the same time, and save the user plane context of the UE, such as the IP address and routing information of the UE. The user plane anchor (InterAS Anchor is the user plane anchor for mobility between different access systems, IASA) is the user plane anchor point for users to access the packet data network. It has the functions of packet routing and forwarding, and completes the policy charging execution function ( Policy and Charging Enforcement Function, PCEF) and collect charging information, etc. Home Subscriber Server (HSS) is used to store user subscription information.

Based on the above evolved network architecture, when UE moves between different RAT systems (such as 2G/3G UTRAN/GERAN network and LTE/SAE evolved network), UE will cause frequent network registration process due to camping in different networks The ping-pong effect leads to a waste of air interface resources. For this phenomenon, refer to FIG. 2. Under the prior art, when the UE moves to RAT2 after registering in RAT1 and performs network registration again, a UE association will be established between the corresponding network nodes of the two RAT systems Context, the association context includes the UE's user ID, temporary user ID, UE registered location area and network node information, etc., so that the UE is in the registration area corresponding to the two network nodes (routing area RA or tracking area TA, etc.) There is no need to initiate any registration process when moving between.

In the above-mentioned evolved network system, when a network node fails, the adjacent network nodes pass heartbeat messages (such as the echo detection message in the user plane tunnel between the two network nodes, or the heart-beat heartbeat message in the SCTP connection, etc.) ) to discover the faulty network node; wherein, the adjacent network node and the faulty network node belong to the same RAT system, or belong to two different RAT systems.

When a faulty network node is found in the evolved network, the prior art follows two fault handling methods in the UMTS network to solve the problem.

The first method is: relocate or register the UE to another network node. Although this method can effectively transfer users, the relevant process can only be triggered by the UE actively sending a request message. If the UE actively sends a request message If the downlink data of the UE arrives before, the downlink data will be discarded, which will cause the UE to be unable to be paged normally, that is, unable to receive services.

The second method is: Divide N working network nodes into a backup group, and one (or several) backup devices for disaster recovery perform static backup of the group's data. When a network node fails, the backup The device loads the data of the failed network node and takes over the work of the network node; although this method does not affect the normal paging of the UE, it needs to reserve certain network resources due to the need for backup data, which will occupy a certain amount of network resources. equipment, resulting in a waste of resources.

It can be seen from the above that the fault handling method in the UMTS network is not suitable for the evolved network, therefore, proposing a fault handling method suitable for the evolved network has become a problem to be solved at present.

Contents of the invention

Embodiments of the present invention provide a method, device and system for handling faults, which are used to solve the problem in the prior art that there is no suitable method for handling faults in an evolved network.

A method of handling failures, comprising the steps of:

The first network node determines that the second network node has failed;

The first network node performs a corresponding processing flow according to the radio access system where the second network node is located, through which the user terminal that establishes the user plane context on the second network node Node logout; where,

When the first network node determines that the second network node with the user terminal association context with the current node fails, the first network node sends the user terminal corresponding to the user terminal according to the user terminal association context A message for deleting the information of the second network node; wherein the first network node and the second network node respectively belong to radio access systems of different radio access technologies.

A method of handling failures, comprising the steps of:

The first network node determines that the second network node has failed;

The first network node performs a corresponding processing flow according to the radio access system where the second network node is located, through which the user terminal that establishes the user plane context on the second network node node logout;

Wherein, if the first network node and the second network node respectively belong to wireless access systems of different wireless access technologies, the processing procedure includes steps:

The first network node sends information about the user terminal to a third network node, where the first network node and the second network node have an association context of the user terminal, and the third network node The network node and the second network node belong to the same radio access system;

The third network node performs network registration according to the received relevant information of the user terminal, and the user terminal records the information of the third network node and deletes the information of the second network node.

A method of handling failures, comprising the steps of:

The first network node determines that the second network node has failed;

The first network node performs a corresponding processing flow according to the radio access system where the second network node is located, through which the user terminal that establishes the user plane context on the second network node Node logout; where,

If the first network node and the second network node belong to the same wireless access system, the processing flow includes steps:

When the user plane anchor receives the downlink data, it sends a paging request message to the first network node, where the paging request message carries relevant information of the user terminal;

The first network node acquires the user terminal's own information from the user terminal according to the relevant information of the user terminal and performs network registration.

After completing the registration, the first network node instructs the user terminal to delete the information of the second network node locally, and record the information of the first network node.

A communication system comprising:

The user terminal is used to establish a connection with a corresponding communication device to complete data communication;

A plurality of communication devices are used to connect the user terminal to the network, wherein when the first communication device determines that the second communication device fails, the first communication device Entering the system to perform a corresponding processing flow, through which the user terminal that has established a user plane context on the second communication device is logged out from the second communication device;

Wherein, when the first communication device determines that the second communication device with the user terminal association context with the communication device fails, the first communication device sends a corresponding user terminal according to the user terminal association context A message for deleting the information of the second communication device; wherein, the first communication device and the second communication device respectively belong to wireless access systems of different wireless access technologies.

A communication system comprising:

The user terminal is used to establish a connection with a corresponding communication device to complete data communication;

A plurality of communication devices are used to connect the user terminal to the network, wherein when the first communication device determines that the second communication device fails, the first communication device Entering the system to perform a corresponding processing flow, through which the user terminal that has established a user plane context on the second communication device is logged out from the second communication device;

Wherein, if the first communication device and the second communication device respectively belong to wireless access systems of different wireless access technologies, the first communication device sends the relevant information of the user terminal to the third communication device, wherein , the first communication device and the second communication device have an association context of the user terminal, and the third communication device and the second communication device belong to the same wireless access system; and the second communication device The third communication device performs network registration according to the received relevant information of the user terminal, and the user terminal records the information of the third communication device and deletes the information of the second communication device.

A communication system comprising:

The user terminal is used to establish a connection with a corresponding communication device to complete data communication;

A plurality of communication devices are used to connect the user terminal to the network, wherein when the first communication device determines that the second communication device fails, the first communication device Entering the system to perform a corresponding processing flow, through which the user terminal that has established a user plane context on the second communication device is logged out from the second communication device;

Wherein, if the first communication device and the second communication device belong to the same wireless access system, when the user plane anchor receives downlink data, it sends a paging request message to the first communication device, and the paging request The message carries the relevant information of the user terminal; the first communication device obtains the user terminal's own information from the user terminal according to the relevant information of the user terminal and performs network registration; and the first communication device After the registration is completed, instruct the user terminal to locally delete the information of the second communication device, and record the information of the first communication device.

In the embodiment of the present invention, after the user terminal is registered on the network, if an adjacent network node finds that the network node registered by the user fails, the adjacent network node will separate the user terminal from the failed network node, or separate the user terminal from the failed network node. The faulty network node is transferred to another network node, so that the communication context of the user terminal can be effectively transferred, and other network nodes can automatically take over the user terminal, so that the user terminal can normally initiate a service process, thus maintaining the user service Continuity, thereby improving the user experience.

Description of drawings

FIG. 1 is a diagram of an evolved network architecture in the prior art;

FIG. 2 is a schematic diagram of an evolved network architecture in the prior art;

FIG. 3A is a schematic diagram of an evolved network architecture in an embodiment of the present invention;

FIG. 3B is a functional structural diagram of a network node in an embodiment of the present invention;

FIG. 4 is a flow chart of separating user terminals in an embodiment of the present invention;

FIG. 5 is a flow chart of user terminal re-registration in an embodiment of the present invention;

FIG. 6 and FIG. 7 are flowcharts of transferring user terminals during the implementation of the present invention;

FIG. 8 is a flowchart of a user terminal triggered by a user plane anchor point transfer in an embodiment of the present invention;

FIG. 9 is a flow chart of an access node triggering transfer of a user terminal in an embodiment of the present invention.

Detailed ways

In the embodiment of the present invention, when the first network node in the evolved network determines that the second network node is faulty, the first network node performs a corresponding processing procedure according to the wireless access system where the second network node is located. Through the The processing flow causes the user terminal that has established the user plane context on the second network node to log out from the second network node, where the logout includes separating the user terminal from the second network node, or detaching the user terminal from the second network node The second network node transfers to other network nodes.

Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in FIG. 3A, in the embodiment of the present invention, the communication system includes two radio access technology (Radio Access Technology, RAT) systems of 2G/3G network and LTE/SAE network, which are called RAT A and RAT B respectively. The access network nodes in RATA A are called access node a1, access node a2..., the core network nodes in RATA are called network node A1, network node A2..., similarly , the access network nodes in RAT B are called access node b1, access node b2..., the core network nodes in RAT B are called network node B1, network node B2..., However, there is a common user plane anchor point in RAT A and RAT B, and the user plane anchor point may be the same physical entity as a certain network node, or an independent physical entity.

As shown in FIG. 3B , a network node (which may be a network node A1 or a network node B1 ) in a communication system includes a communication unit, a judging unit and a processing unit. The communication unit is used for information interaction with other network nodes or user terminals; the judging unit is used for determining that another network node fails according to the heartbeat detection message; The wireless access system performs a corresponding processing flow, through which the user terminal that establishes the user plane context on the faulty network node deletes the information of the network node, and removes the user terminal from the faulty network node Separate, or transfer the user terminal to another network node.

Based on the above network architecture, in this embodiment, an association context of a user terminal (UE) has been established between network node A1 and network node B1. When network node A1 detects that network node B1 fails through a heartbeat message, the network node A1 obtains the network address of the UE according to the UE's association context, and initiates a Detach process for the UE, forcing the UE to be separated from the radio access system RAT B where the network node B1 is located, that is, instructing the UE to locally delete all links with the network Information related to node B1.

Referring to Figure 4, the detailed process of the network node A1 initiating the detachment process for the UE is as follows:

Step 400: The network node A1 sends a detach request message to the UE, instructing the UE to detach from the RAT B.

Usually, the network node A1 cannot know that the wireless access system where the UE is currently located is RATA A or RATB, so the network node A1 directly sends a separation request message to the UE in the RATA; at the same time, a network node B2 is selected in the RATB, and the The network node B2 forwards the detachment request message to the UE, and the detachment request message contains the UE's own information, including the UE's user identifier, temporary user identifier, other UE characteristic identifiers (such as IP address), and the location of the UE in the RAT B District information, etc. Of course, if the network node A1 can know in advance whether the radio access system of the UE is RATA or RATB, the network node A1 may choose one of the above two ways to send the detach request message.

If the user plane anchor receives the downlink data sent to the UE and sends a data notification request message to the network node A1 before the network node A1 sends the detach request message, then the network node A1 will also notify the UE that there is a downlink request message when sending the detach request message. Data arrives.

Step 401: the network node A1 initiates the user plane context update procedure of the UE to the user plane anchor.

In this process, the user plane anchor activates the user plane context of the UE that is locally related to the network node B1 and deletes the information about the UE and the network node B1 locally.

Step 402: the network node A1 sends a separation instruction message to the Home Subscriber server (HSS), the message carries the relevant information of RAT B, and the HSS server deletes the locally stored association information between the network node B1 and the UE .

On the other hand, the network node A1 also locally deletes the information of the network node B1.

Step 403: After the UE receives the detach request message sent by the network node A1, it detaches the UE from the network node B1, and at the same time, the UE deletes the relevant information of the network node B1 locally, and returns a detachment message to the network node A1 when the operation is completed. Accept message.

The UE may directly send the detachment acceptance message to the network node A1, or may send it to the network node B2 first, and then the network node B2 forwards it to the network node A1.

Step 404: If the wireless access system where the UE is currently located is RATA A, then the UE locally deletes the information of the network node B1 and updates its own communication context, and receives the downlink data when it finds that there is downlink data; The wireless access system is RAT B, then UE deletes the information of network node B1, and re-registers to a new network node in RAT B, and updates its own communication context, and if it finds downlink data, it receives the downlink data.

Different from the above-mentioned embodiments, when the network node A1 finds that the network node B1 fails, it can also initiate a re-registration (Re-RAU/TAU, Re-attach) process, requesting the UE to re-register with another network node in the RAT B. Referring to Fig. 5, the detailed flow of the network node A1 instructing the UE to re-register is as follows:

Step 500: Network node A1 sends a re-registration request message (Re-RAU/Re-TAU, Re-attach) to UE, requesting UE to re-register to another new network node in RAT B. Similarly, network node A1 directly sends a re-registration request message to UE, and at the same time forwards the re-registration request message through network node B2 in RAT B. The re-registration request message includes UE's user ID, temporary user ID and other UE characteristics An identifier (such as an IP address), and location area information registered by the UE in the RAT system, etc.

Step 501: If the UE is camping on RATA A, after receiving the re-registration request message, the UE first replies to the network node A1 with a re-registration response message, and then sends a registration request message to the corresponding network node B, the re-registration response The message contains relevant information about whether the UE is registered to the RATB (for example, re-registration will be initiated in the RAT B or will not be initiated temporarily, etc.).

If the UE is camping on RAT B, the UE directly initiates a registration request to the network. The network node that the UE registers with may be network node B2 or other network nodes, that is, the network node that forwards the re-registration response message and re-registers with the UE. The network nodes of can be the same network node or different network nodes. In this embodiment, the case where the UE registers with the network node B2 is taken as an example for illustration.

Step 502: Network node B2 acquires UE communication context (including one or more information in UE's mobility management context, user plane context and association context) from network node A1, and performs network registration with HSS; during the registration process , the HSS locally deletes the association information between the UE and the network node B1, and sends the user subscription information of the UE to the network node B2.

Step 503: the network node B2 replies to the UE with a registration reception message, which carries the temporary user identifier assigned by the network node B2.

Step 504: The UE replies a registration complete message to the network node B2.

Step 505: The UE initiates a user plane context update procedure between the network node A1, the network node B2 and the user plane anchor. During this process, UE, network node A1 and user plane anchor delete the association information of UE and network node B1 locally, and record the relevant information of network node B2 at the same time, and network node B2 records the relevant information of UE locally.

When the UE finds that there is downlink data, no matter the UE is in RAT A or RAT B, the downlink data can be received through the network node A1 or the network node B2.

In addition, when the network node A1 finds that the network node B1 fails, it can also transfer the UE to another network node in the RAT B. In this embodiment, the transfer of the UE by the network node A1 can be realized through two methods.

The first method is: the network node A1 selects another network node B2 in the RAT B, and the network node B2 initiates a temporary user identity reassignment process, and sends the new temporary user identity to the UE for UE transfer. Referring to Figure 6, the detailed process of the first method is as follows:

Step 600: Network node A1 selects another new network node B2 in RAT B, and sends a user transfer request message for transferring UE to network node B2, the user transfer request message includes the user identification (IMSI) and temporary User identification (P-TMSI, S-TMSI) and other information. The user transfer request message may be actively initiated by the network node A1, or may be initiated when the network A1 needs to forward the downlink data of the UE to the network node B1.

Step 601: Network node B1 obtains UE communication context from network node A1, then network node B1 and network node A1 establish UE association context, and network node B1 performs network registration with HSS, during the registration process, HSS Locally delete the association information between the UE and the network node B1, and send the user subscription information of the UE to the network node B1.

Step 602: the network node B2 returns a user transfer response message to the network node A1.

Step 603: the network node B2 initiates a temporary user identity reallocation process, and in this process, the network node B2 sends a new temporary user identity to the UE.

Step 604: An update process of the UE's user plane context is initiated among the UE, the network node A1, the network node B2 and the user anchor. In this update process, UE, network node A1 and user plane anchor delete the association information between UE and network node B1 locally, and record the relevant information of network node B2 at the same time, and network node B2 records the relevant information of UE locally.

When the UE finds that there is downlink data, no matter the UE is in RATA or RAT B, it can receive the downlink data through network node A1 or network node B2.

The second method is: the network node A1 analyzes the temporary mobile user identity of the UE, transfers the UE to a new network node B2, and the network node B2 assigns a new characteristic identifier to the UE, and notifies the corresponding location area (TA/ RA), the access node b1 establishes an association between the feature identifier allocated by the network node B1 and the feature identifier allocated by the network node B2, if the configuration capability of the access node b1 cannot be used between the two If an association is established between these feature identifiers, the access node b1 notifies the network node B2, and the network node B2 instructs the UE to re-register in the RAT B.

Referring to Figure 7, in this embodiment, the detailed process of the second method is as follows:

Step 700: the network node A1 sends the communication context of the UE to the network node B2.

In the process, the network node A1 first analyzes the temporary mobile user identity of the UE, then selects a new network node B2 in the RAT B, and sends the communication context of the UE to the network node B2.

Step 701: The network node B2 assigns a new feature identifier (called B2) to the UE, and notifies the access node b1 of the corresponding location area in the RATB; the feature identifier (called B1) allocated by the access node b1 on the network node B1 ) to establish an association with B2.

Step 702: the network node B2 notifies the network node A1 that the communication context of the UE has been received, and then the network node B2 and the network node A1 establish an association context of the UE.

Step 703: A UE user plane context update process is initiated among the network node B2, the network node A1 and the user plane anchor. In this update process, network node A1 and the user plane anchor delete the association information between UE and network node B1 locally, and record the relevant information of network node B2 at the same time, and network node B2 records the relevant information of UE locally.

Step 704: the network node B2 performs network registration with the HSS to obtain the user subscription information of the UE, and the HSS locally deletes the association information between the UE and the network node B1.

If the UE is currently in RAT A, the UE sends an access request message to network node A, and updates the local user plane context after network node A1 returns an access acceptance message. At this time, the UE can actively request business services or The corresponding downlink data is received.

If the UE is currently in RAT B, the UE sends an access request message to the access node b1, and the access node b1 analyzes the temporary mobile user identity of the UE, and according to the association information between B1 and B2, sends the access request message to The incoming request message is forwarded to the network node B2. After receiving the access acceptance message returned by the network node B2, the UE updates the local user plane context. At this time, the UE can actively request business services or receive corresponding downlink data.

In the above several embodiments, the network node A1 and the network node B1 are respectively in different wireless access systems (RATA A and RAT B), and when another network node A2 in the same RAT A as the network node A1 occurs In the event of a failure, if there is currently a UE camping in the location area corresponding to network node A2 (that is, network node A2 has the user plane context of the UE), then network node A1 will transfer the UE to its own network node, replacing network node A2 as the UE Provide business services.

Referring to Figure 8, when downlink data arrives, the detailed process of network node A1 transferring UE is as follows:

Step 800: the user plane anchor receives the downlink data of the UE,

Step 801: The user plane anchor sends a data notification to the network node A2, and determines that the network node A2 cannot reply a response message.

Step 802: The user plane anchor sends a paging request message to the network node A1, and the paging request message includes UE's user identity (IMSI and/or P-TMSI, etc.) and location area information.

Step 803: The network node A1 sends a paging request message to the UE in the location area where the UE is located, and the message carries the user identifier (IMSI and/or P-TMSI, etc.) of the UE. area, the UE will be paged in all location areas corresponding to the network node pool where network node A2 is located or in all location areas under the jurisdiction of network node A2, with the UE's identity (IMSI) and the temporary user identity assigned by network node A1 wait.

Step 804: After receiving the paging request message, the UE updates the local temporary user identity, and replies a paging response message to the network node A1, the message carrying the UE's own information.

Step 805: the network node A1 initiates a security authentication process for the UE, that is, determines whether the UE has the right to use the corresponding business service.

Step 806: After receiving the paging response message, the network node A1 performs network registration with the HSS. When registering, the network node A1 sends a location update location request message to the HSS, which carries the identification information of the UE and the identification of the network node A1 information.

Step 807: The HSS replies to the network node A1 with an update location response message, which carries the user subscription information of the UE.

Step 808: Network node A1 initiates a UE user plane context update process between the UE, network node A1, and the user plane anchor. In this update process, the UE and the user plane anchor locally delete the association between the UE and the network node A2 The information records the relevant information of the network node A1, and the network node A1 records the relevant information of the UE locally.

Step 809: The user plane anchor forwards the received downlink data to the UE.

Referring to Figure 9, when the UE actively sends a service request message, the detailed process of network node A1 transferring the UE is as follows:

Step 900: UE sends a service request message to network device A2 via access node b1.

Step 901: the access node b1 cannot send the service request message to the network node A2, then the access node b1 forwards the service request message to the newly selected network node A1.

Step 902: the network node A1 acquires the UE's identity (IMSI, etc.) from the UE.

Step 903: the network node A1 initiates a security authentication procedure for the UE.

Step 904: Network node A1 performs network registration with the HSS. During registration, network node A1 sends an update location request message to the HSS, which carries the identification information of the UE and the identification information of the network node A1; and the HSS sends a request message to the network node A1 Reply with an update location response message, and send the user subscription information of the UE to the network node A1.

Step 905: After the network node A1 registers with the HSS, it replies a service acceptance message to the UE, and the message carries the temporary user identifier of the network node A1.

Step 906: The UE initiates a communication context update process. In this update process, the network node A1 obtains the UE's user plane context from the user plane anchor, and the UE, the access node b1, and the user plane anchor delete the connection between the UE and the network locally. The association information of the node A2 records the relevant information of the network node A1, and the network node A1 locally records the relevant information of the UE.

To sum up, in the embodiment of the present invention, after the user terminal is registered on the network, if an adjacent network node finds that the network node registered by the user fails, the adjacent network node will separate the user terminal from the failed network node, Or transfer the user terminal from the failed network node to another network node, so that the communication context of the user terminal can be effectively transferred, so that other network nodes can automatically take over the user terminal, so that the user terminal can normally initiate a business process, In this way, the continuity of user services is maintained, and the user experience is further improved.

Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and variations in the embodiments of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the embodiments of the present invention are also intended to include these modifications and variations.

Claims (22)

1. A method of handling a fault, comprising the steps of:

the first network node determines that the second network node fails;

the first network node carries out corresponding processing flow according to a wireless access system where a second network node is located, and the user terminal establishing the user plane context on the second network node is logged off from the second network node through the processing flow; wherein,

when the first network node determines that a second network node with a user terminal association context between the first network node and the node has a fault, the first network node sends a message for deleting the second network node information to the corresponding user terminal according to the user terminal association context; wherein the first network node and the second network node belong to wireless access systems of different wireless access technologies, respectively.

2. The method according to claim 1, wherein the first network node sends the message for deleting the second network node information directly to the user terminal or/and to a third network node belonging to the same radio access system as the second network node, which forwards the message for deleting the second network node information to the user terminal.

3. The method according to any of claims 1 and 2, wherein if the ue is in the same radio access system as the first network node, the ue deletes the information of the second network node and updates its communication context, and receives downlink data when it is found that there is the downlink data;

if the user terminal and the second network node are in the same wireless access system at present, the user terminal deletes the information of the second network node, re-registers to a third network node which belongs to the same wireless access system with the second network node, updates the communication context of the user terminal, and receives downlink data if the user terminal finds the downlink data.

4. A method of handling a fault, comprising the steps of:

the first network node determines that the second network node fails;

the first network node carries out corresponding processing flow according to a wireless access system where a second network node is located, and the user terminal establishing the user plane context on the second network node is logged off from the second network node through the processing flow;

wherein, if the first network node and the second network node belong to wireless access systems of different wireless access technologies, the processing flow includes the steps of:

the first network node sends the related information of the user terminal to a third network node, wherein the first network node and the second network node have the associated context of the user terminal, and the third network node and the second network node belong to the same wireless access system;

and the third network node performs network registration according to the received related information of the user terminal, and the user terminal records the information of the third network node and deletes the information of the second network node.

5. The method according to claim 4, wherein the first network node sends a message for instructing the ue to re-register to the third network node, where the message carries information of the ue itself, the third network node obtains the communication context of the ue according to the information of the ue itself and performs network registration, and the third network node forwards the message for instructing the ue to re-register to the ue.

6. The method of claim 5, wherein the first network node further sends a message directly to the user terminal instructing the user terminal to re-register.

7. The method of claim 4, comprising the steps of: the first network node sends a message for indicating the transfer of the user terminal to the third network node, wherein the message carries the information of the user terminal, and the third network node acquires the communication context of the user terminal according to the information of the user terminal and performs network registration.

8. The method of claim 7, wherein the third network node returns a response message to the first network node after network registration with a home subscriber server and sends a temporary subscriber identity to the user terminal.

9. The method of claim 4, wherein the first network node sends the communication context of the user terminal to the third network node, and the third network node performs network registration according to the communication context of the user terminal.

10. The method of claim 9, wherein the third network node sends its own signature to the corresponding access node, which establishes association information between the signature of the third network node and the signature of the second network node.

11. The method of claim 10, wherein if the access node fails to establish the association information, the access node notifies the third network node that the user terminal is re-registered with the corresponding other network node.

12. The method according to any of claims 4-11, wherein during the handover of the user terminal, the user plane anchor point and the home subscriber server record information of the third network node and delete the association information of the user terminal with the second network node.

13. The method according to claim 12, wherein when the third network node performs network registration, the third network node and the first network node establish an association context of the user terminal, and the home subscriber server locally deletes association information of the second network node and the user terminal, and records related information of the third network node.

14. The method of claim 13, wherein the ue updates its user plane context after transferring to the third network node, and receives downlink data when the ue finds the downlink data.

15. A method of handling a fault, comprising the steps of:

the first network node determines that the second network node fails;

the first network node carries out corresponding processing flow according to a wireless access system where a second network node is located, and the user terminal establishing the user plane context on the second network node is logged off from the second network node through the processing flow; wherein,

if the first network node and the second network node belong to the same wireless access system, the processing flow comprises the following steps:

when receiving downlink data, the user plane anchor point sends a paging request message to the first network node, wherein the paging request message carries relevant information of the user terminal;

the first network node acquires the information of the user terminal from the user terminal according to the relevant information of the user terminal and carries out network registration;

and after the first network node finishes the registration, the user terminal is instructed to delete the information of the second network node locally, and the information of the first network node is recorded.

16. The method of claim 15, wherein an access node forwards a service request message to the first network node when receiving the service request message sent by a user terminal, where the service request message carries relevant information of the user terminal, and the first network node obtains information of the user terminal from the user terminal according to the relevant information of the user terminal and performs network registration.

17. The method according to claim 15 or 16, wherein the updating of the communication context of the user terminal is performed between the first network node, the user terminal and a user plane anchor after the first network node has completed registration.

18. The method of claim 17, wherein during the handover of the user terminal, a user plane anchor and a home subscriber server record information of the first network node and delete association information of the user terminal with the second network node.

19. The method of claim 18, wherein the first network node sends a temporary subscriber identity to the user terminal during the handover of the user terminal.

20. A communication system, comprising:

the user terminal is used for establishing connection with the corresponding communication device so as to complete data communication;

the communication device comprises a plurality of communication devices and a control module, wherein when a first communication device determines that a second communication device has a fault, the first communication device carries out corresponding processing flow according to a wireless access system where the second communication device is located, and the user terminal establishing a user plane context on the second communication device is logged off from the second communication device through the processing flow;

when the first communication device determines that a second communication device with a user terminal association context between the first communication device and the second communication device has a fault, the first communication device sends a message for deleting information of the second communication device to a corresponding user terminal according to the association context of the user terminal; the first communication device and the second communication device belong to wireless access systems of different wireless access technologies respectively.

21. A communication system, comprising:

the user terminal is used for establishing connection with the corresponding communication device so as to complete data communication;

the communication device comprises a plurality of communication devices and a control module, wherein when a first communication device determines that a second communication device has a fault, the first communication device carries out corresponding processing flow according to a wireless access system where the second communication device is located, and the user terminal establishing a user plane context on the second communication device is logged off from the second communication device through the processing flow;

if the first communication device and the second communication device belong to wireless access systems of different wireless access technologies respectively, the first communication device sends related information of a user terminal to a third communication device, wherein the first communication device and the second communication device have an associated context of the user terminal, and the third communication device and the second communication device belong to the same wireless access system; and the third communication device performs network registration according to the received related information of the user terminal, and the user terminal records the information of the third communication device and deletes the information of the second communication device.

22. A communication system, comprising:

the user terminal is used for establishing connection with the corresponding communication device so as to complete data communication;

the communication device comprises a plurality of communication devices and a control module, wherein when a first communication device determines that a second communication device has a fault, the first communication device carries out corresponding processing flow according to a wireless access system where the second communication device is located, and the user terminal establishing a user plane context on the second communication device is logged off from the second communication device through the processing flow;

if the first communication device and the second communication device belong to the same wireless access system, the user plane anchor point sends a paging request message to the first communication device when receiving downlink data, wherein the paging request message carries relevant information of the user terminal; the first communication device acquires the information of the user terminal from the user terminal according to the relevant information of the user terminal and carries out network registration; and after the first communication device finishes the registration, the first communication device instructs the user terminal to delete the information of the second communication device locally, and records the information of the first communication device.

Images