CN105407541B

CN105407541B - Service recovery method, device and system for wireless communication network

Info

Publication number: CN105407541B
Application number: CN201510728771.7A
Authority: CN
Inventors: 黄英
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2009-04-27
Filing date: 2009-04-27
Publication date: 2020-02-21
Anticipated expiration: 2029-04-27
Also published as: CN105407541A

Abstract

A traffic recovery method of a wireless communication network comprises the following steps: receiving a Radio Resource Control (RRC) reestablishment request or a cell update message from user equipment; if the RRC reestablishment fails or the cell updating fails, carrying out the RRC establishment process triggered by the non-access stratum of the user equipment; and after the RRC establishment process is completed, sending an initial user equipment message to the core network equipment. The embodiment of the invention ensures the continuity of the user service in the activated state.

Description

Service recovery method, device and system for wireless communication network

Technical Field

The present invention relates to wireless communication technologies, and in particular, to a method, an apparatus, and a system for recovering a service in a wireless communication network.

Background

During the operation of the mobile network, a cell may be suddenly broken or suddenly powered off, and at this time, the cell may not work normally, and a service of a User Equipment (UE) in an active state may be interrupted. When a cell suddenly fails and cannot normally work, for the UE, a Radio Link Failure (RLF) is detected, the UE reselects a new cell, and then initiates a Link reestablishment process of a Radio Link.

In the process of implementing the present invention, the inventor finds that in the prior art, after a cell fails and a UE selects a new cell, a technical scheme how to establish connection between access network equipment of the new cell and a core network is not provided, and continuity of a UE service in an active state cannot be ensured.

Disclosure of Invention

The embodiment of the invention provides a service recovery method of a wireless communication network, which comprises the following steps: receiving a Radio Resource Control (RRC) reestablishment request or a cell update message from user equipment; if the RRC reestablishment fails or the cell updating fails, triggering an RRC establishment process by a non-access layer of the user equipment; and after the RRC establishment process is completed, sending an initial user equipment message to the core network equipment.

The embodiment of the invention also provides a service recovery method for a wireless communication network, which comprises the following steps: receiving a Radio Resource Control (RRC) reestablishment request or a cell update message from user equipment; if the context information of the user equipment cannot be known, a notification message is sent to the source base station to request the source base station to initiate a handover preparation procedure of the X2 and/or S1 interface.

The embodiment of the invention also provides a service recovery method for a wireless communication network, which comprises the following steps: receiving a Radio Resource Control (RRC) reestablishment request or a cell update message from user equipment; the method comprises the steps of obtaining context information of user equipment, sending a notification message to core network equipment, and requesting to establish connection with the core network equipment.

An embodiment of the present invention further provides a service recovery apparatus for a wireless communication network, including: a receiving unit, configured to receive a radio resource control RRC reestablishment request or a cell update message from a user equipment; an RRC establishing unit, configured to perform an RRC establishing process initiated by a non-access stratum of the ue when RRC reestablishment fails or cell update fails; and the processing unit is used for sending an initial user equipment message to the core network equipment after the RRC establishment process is completed.

An embodiment of the present invention further provides a service recovery apparatus for a wireless communication network, including: a receiving unit, configured to receive a radio resource control RRC reestablishment request or a cell update message from a user equipment; a notifying unit, configured to send a notification message to the source access network device to request the source access network device to initiate a handover preparation procedure of the X2 and/or S1 interface when the context information of the user equipment cannot be known.

An embodiment of the present invention further provides a service recovery apparatus for a wireless communication network, including: a receiving unit, configured to receive a radio resource control RRC reestablishment request or a cell update message from a user equipment, where the RRC reestablishment request or the cell update message carries context information and/or a user equipment identifier of the user equipment; an obtaining unit, configured to obtain context information of the user equipment; and a sending unit, configured to send a notification message to the core network device, requesting to establish a connection with the core network device.

The embodiment of the invention also provides service recovery of the wireless communication network, which comprises core network equipment and the service recovery device of the wireless communication network.

According to the technical scheme provided by the embodiment of the invention, when the cell suddenly fails and can not work normally and the UE reselects a new cell, the connection establishment process of the access network equipment and the core network equipment of the new cell is carried out when the service is recovered, so that the continuity of the UE service in an activated state is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

Fig. 1 is a schematic coverage diagram of a cell of a heterogeneous system;

fig. 2 is a schematic structural diagram of an LTE system;

FIG. 3 is a schematic diagram of the structure between the LTE system and the UMTS/GSM system;

fig. 4 is a schematic diagram of a service recovery flow in embodiment 1 of the present invention;

fig. 5 is a schematic diagram of a service recovery flow in embodiment 2 of the present invention;

fig. 6 is a second schematic view of a service recovery process in embodiment 2 of the present invention;

fig. 7 is a schematic diagram of a service recovery flow in embodiment 3 of the present invention;

fig. 8 is a schematic diagram of a service recovery flow in embodiment 4 of the present invention;

fig. 9 is a schematic diagram of a service recovery flow in embodiment 5 of the present invention;

fig. 10 is a schematic diagram of a service recovery flow in embodiment 6 of the present invention;

fig. 11 is a block diagram of a service recovery apparatus according to embodiment 7 of the present invention;

fig. 12 is a second block diagram of a service restoration apparatus according to embodiment 7 of the present invention;

fig. 13 is a block diagram of a service recovery apparatus according to embodiment 8 of the present invention;

fig. 14 is a second block diagram of a service recovery apparatus according to embodiment 8 of the present invention;

fig. 15 is a block diagram of a service restoration apparatus in embodiment 9 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In a mobile communication system, inter-system cells or inter-frequency cells may be arranged in the same coverage for the purpose of service continuity or coverage solution. As shown in fig. 1, a cell a in an LTE (Long Term Evolution) System and a cell a' in a UMTS (Universal Mobile Telecommunications System) System cover a same area.

As shown in fig. 2, an interface between a core network device MME (Mobility management entity) and an evolved NodeB (eNB) is an S1 interface, an interface between different MMEs is an S10 interface, an interface between different enbs is an X2 interface, an interface between an eNB and a UE is a Uu interface, and the Uu interface performs communication through an RRC (radio resource Control) message.

As shown in fig. 3, the connection between the LTE system and the UMTS/GSM is that an Iu/a interface is located between an access network device RNC/BSC (radio network Controller/Base Station Controller) and a core network device SGSN (Serving GPRS Support Node), and an S3 interface is located between the MME and the SGSN.

The following embodiments of the present invention will provide a connection establishment procedure between a new cell access network device and a core network device when a cell in an LTE system fails and a UE reselects to the new cell, where the new cell may be a cell of the LTE system or a cell of a different system, such as a UMTS cell or a GSM cell.

Example 1

The present embodiment provides a method for recovering a service in a wireless communication network, as shown in fig. 4, the method includes:

step 11, the new cell access network device receives an RRC reestablishment request or a cell update message from the UE.

When the UE finds the RLF, it reselects a new cell and sends an RRC reestablishment request to the base station of the new cell. The new cell may be an LTE cell, or may also be a UMTS cell or a GSM cell. The access network equipment of the LTE cell is eNB, and the access network equipment of the UMTS/GSM cell is RNC/BSC. When the new cell is an LTE cell, the message sent by the UE is an RRC reestablishment request message, and when the new cell is a UMTS/GSM cell, the message sent by the UE is an RRC reestablishment request or a cell update message.

Step 12, if the access network device of the new cell does not find the context information of the user equipment, sending a corresponding RRC reestablishment failure message or cell update failure message to the user equipment, or not sending any message.

Step 13, RRC establishment procedure triggered by NAS (Non-Access-Stratum) is performed. The RRC establishment procedure described above is triggered by the non-access stratum of the UE. And if the UE receives the failure message or does not receive any message within the set time, triggering the link establishment with the new cell by the non-access stratum. Optionally, in the RRC establishment procedure, an indication or cause value may be included in an RRC message from the UE to indicate that the RRC establishment procedure is a procedure of "recovering" a link triggered by a non-access stratum.

And step 14, after the RRC establishment process is completed, sending an initial UE message to the core network equipment. For an LTE cell, the core network device is an MME, and for a UMTS/GSM cell, the core network device is an SGSN.

In this embodiment, the connection between the new cell base station and the core network device is established through the initial UE message, so that the continuity of the UE service in the active state is ensured.

Example 2

In this embodiment, if a new cell reselected by a UE is a cell of an LTE system, an access network device of the new cell in this embodiment is an eNB of the new cell, that is, a new eNB. As shown in fig. 5, the method includes the following steps:

step 101, when the UE finds the RLF, it reselects a new cell and sends an RRC reestablishment request to an eNB of the new cell (new eNB).

Step 102, after receiving the RRC reestablishment request, the new eNB issues an RRC reestablishment failure message if the context (UEcontext) of the UE is not found.

Step 103, the non-access stratum of the UE triggers the RRC establishment procedure. And after the NAS is triggered, the new eNB and the UE perform an RRC establishment process. Optionally, in the RRC establishment procedure, an indication or cause value may be included in the RRC message from the UE to indicate that the RRC establishment procedure is a non-access stratum triggered procedure for "recovering" a link.

Step 104, after the RRC establishment is completed, the new eNB sends an initial UE message to the MME, triggering the establishment of the S1 interface. For example, after receiving the RRC setup complete Message from the UE, the new eNB sends an Initial UE Message (Initial UE Message) to the MME, triggering the setup of the S1 interface. In this step, connection between the eNB and the MME is achieved by the initial UE message.

Step 105, the new eNB receives an initial context setup request from the MME.

And step 106, performing a security authentication process between the UE and the new eNB. In this process, the new eNB may obtain context information of the UE. This step is optional.

Step 107, the new eNB and UE perform RRC reconfiguration.

Step 108, the new eNB sends an initial context setup response to the MME.

The steps 105-108 are the same as the existing normal business request process.

Optionally, step 108 is followed by step 109, in which the MME sends an S1 interface release command to the source eNB to notify the source eNB to release the S1 interface. There are many ways to release the S1 interface of the source eNB, and releasing the S1 interface according to the S1 interface release command is only one way, so the embodiment of the present invention is not limited thereto, and for example, the S1 interface between the MME and the source eNB may also be released periodically by triggering a timer.

As another embodiment of the present invention, if the MME to which the eNB of the new cell is connected changes, that is, the new MME to which the new eNB is connected and the source MME to which the source eNB is connected are not an entity, the two MMEs may transfer a message through the S10 interface, that is, the new MME sends a message to the source MME through the S10 interface to notify the source eNB to release the S1 interface, and then the source MME notifies the source eNB to release the S1 interface.

In the above embodiment, the new eNB completes the establishment of the S1 interface by initiating an originating service flow, such as an initial UE message.

As another embodiment of the present invention, if the new cell is a UMTS/GSM cell, the access network device RNC/BSC of the UMTS/GSM cell corresponds to the new eNB in the above embodiment, the Iu/a interface corresponds to the S1 interface in the above embodiment, and the new MME corresponds to the SGSN, in which case, the RNC/BSC sends an initial UE message of the Iu/a interface to establish the Iu/a interface. As shown in fig. 6, taking the new cell as a UMTS cell as an example, the service recovery method of this embodiment includes the following steps:

step 201, when the UE finds the RLF, reselects the new cell, and sends an RRC reestablishment request or a cell update (cell update) message to an RNC (new RNC) of the new cell. Alternatively, a timer may be started simultaneously.

Step 202, after receiving the RRC reestablishment request or the cell update message, the new RNC does not find the context (UE context) of the UE, and issues an RRC reestablishment failure or cell update failure message or does not send any message.

In step 203, the non-access stratum (NAS) of the UE triggers an RRC establishment procedure. And after the UE receives the failure message or the timer is overtime and does not receive any message, the NAS triggers the link establishment with the new cell, and the new RNC and the UE perform an RRC establishment process. Optionally, in the RRC establishment procedure, an indication or cause value may be included in the RRC message from the UE to indicate that the RRC establishment procedure is a procedure of "recovering" a link triggered by a non-access stratum.

Step 204, after the RRC establishment is completed, the new RNC sends an initial UE message to the new SGSN, triggering establishment of the Iu interface. For example, after receiving the RRC setup complete Message, the new RNC initiates an Initial direct transfer Message to perform a service request, and sends an Initial UE Message (Initial UE Message) to the new SGSN through the Iu interface to trigger the setup of the Iu interface.

Step 205, the new SGSN sends a downlink direct transfer message to the UE, and the new RNC transfers the message for a response of the service request.

In step 206, the new RNC and the UE perform a security authentication procedure. This step is optional.

In step 207, the new SGSN sends a Radio Access Bearer (RAB) setup request (RAB assigned request) message to the new RNC.

In step 208, the new RNC and UE perform radio bearer establishment.

In step 209, the new RNC newly sends a RAB establishment response message to the SGSN.

The steps 204-209 are the same as the existing normal business request process.

Optionally, step 209 may be followed by:

in step 210, the new SGSN sends an S1 interface release command to the source MME over the S3 interface.

In step 211, the source MME sends S1 interface release command to the source eNB.

In this embodiment, the RNC of the new cell completes the establishment of the Iu interface with the core network device SGSN of the new cell through an initial UE message, thereby ensuring the continuity of the UE service in the active state.

In the GSM system, a similar BSC completes the establishment of the a interface with the SGSN through the first a interface message of normal service establishment.

Example 3

In this embodiment, if the new cell takes an LTE cell as an example, the access network device of the new cell in this embodiment is an eNB of the new cell, that is, a new eNB. As shown in fig. 7, the method includes:

step 301, the UE finds the RLF, reselects a new cell, and sends an RRC reestablishment request to the new eNB.

Step 302, after receiving the RRC reestablishment request, the new eNB issues an RRC reestablishment failure message to the UE if the UE context of the UE is not found.

Step 303, after receiving the RRC reestablishment failure message, the UE triggers an RRC establishment procedure with the new eNB. And after the NAS is triggered, the new eNB and the UE perform an RRC establishment process. Optionally, in the RRC establishment procedure, an indication or cause value may be included in an RRC message from the UE to indicate that the RRC establishment procedure is a procedure of "recovering" a link triggered by a non-access stratum.

In step 304, the new eNB sends a notification message to the source eNB requesting the source eNB to initiate a handover preparation procedure of the X2 interface and/or the S1 interface. The method for the new eNB to notify the source eNB of the message comprises the following steps: the notification message is sent to the source eNB directly through the X2 interface or sent to the MME through the S1 interface, and the MME forwards the notification message to the source eNB, i.e. to directly or indirectly notify the source base station to initiate the handover preparation procedure of the X2/S1 interface.

After receiving the notification message, the source eNB initiates a handover preparation procedure of the X2/S1 interface. That is, the source eNB performs the handover preparation procedure of the X2/S1 interface after receiving the notification message from the X2 interface of the new eNB or the notification message from the S1 interface of the MME, and establishes the connection between the eNB of the new cell and the S1 interface of the new MME after the handover preparation procedure. Since the handover preparation procedure of the X2/S1 interface is prior art, it is not described in detail herein. Optionally, before the source eNB initiates the handover preparation procedure of the X2/S1 interface, the source eNB may also send a response message to the eNB of the new cell.

In step 304 of this embodiment:

if the new eNB is not aware of the source eNB operational status at the time and there is an X2 interface between the new eNB and the source eNB, a notification message may first be sent to the source eNB over an X2 interface. A timer may be started at the same time. If the X2 interface of the new eNB does not receive the response message or receives the failure message within the specified time, the new eNB sends a notification message to the MME through the S1 interface, and the MME transmits the notification message to the source eNB through the S1 interface to request the source eNB to initiate the handover preparation process of the X2 and S1 interfaces.

If the eNB of the new cell is different from the MME connected with the source eNB, namely the new eNB is connected with the new MME and the source eNB is connected with the source MME, the new eNB sends a notification message to the new MME through an S1 interface, the new MME transmits the notification message to the source MME through an S10 interface, and the source MME forwards the notification message to the source eNB and requires the source eNB to initiate a handover preparation process of the S1 interface.

If the new cell is a UMTS/GSM cell, the access network equipment of the new cell is RNC/BSC, corresponding to the eNB of the new cell, the Iu/A interface corresponds to the S1 interface, and the core network equipment SGSN of the new cell corresponds to the new MME. The RNC/BSC of the new cell sends an Iu/a interface notification message to the source eNB via the SGSN and the source MME, and requests the source eNB to perform an S1 interface handover preparation procedure. The message sent to the new cell after the UE detects the RLF may be an RRC reestablishment or cell update (cell update) message. Specifically, the RNC/BSC sends a notification message to the SGSN through the Iu/a interface, the SGSN sends the notification message to the source MME through the S3 interface, and the source MME forwards the notification message to the source base station through the S1 interface, notifying the source base station to initiate a handover preparation procedure of the S1 interface. After receiving the notification message, the source eNB performs a handover preparation procedure of an interface S1, thereby establishing a connection between the RNC/BSC of the new cell and the Iu/a interface of the SGSN. Optionally, before the source eNB performs the handover preparation procedure of the S1 interface, the source eNB may also send a response message to the eNB of the new cell.

In the embodiment of the invention, the access network equipment of the new cell establishes the connection with the S1 interface of the core network equipment MME of the new cell or establishes the connection with the Iu/A interface of the SGSN by utilizing the switching preparation process, thereby ensuring the continuity of the UE service in the activated state.

Example 4

In this embodiment, if the new cell takes an LTE cell as an example, the access network device of the new cell in this embodiment is an eNB of the new cell, that is, a new eNB. As shown in fig. 8, the method includes:

step 501, the UE finds the RLF, reselects to a new cell, and sends an RRC reestablishment request to the new eNB.

Step 502, the new eNB receives the reestablishment request, and does not find the UE context of the UE, and sends a notification message to the source eNB/MME, requesting the source eNB to initiate a handover preparation procedure of the X2 and/or S1 interface. In this step, sending the notification message to the source eNB/MME includes: and directly sending a notification message to the source eNB through an X2 interface or sending the notification message to the MME through an S1 interface, and forwarding the notification message to the source eNB by the MME so as to directly or indirectly inform the source base station to initiate a handover preparation process of the X2/S1 interface.

After receiving the notification message, the source eNB initiates a handover preparation procedure of the X2/S1 interface, and may also send a response message to the eNB of the new cell.

If the eNB of the new cell (new eNB) does not know the operational status of the eNB of the source cell (source eNB) and there is an X2 interface between the eNB and the source eNB, a notification message is preferably sent over the X2 interface as shown in fig. 8, and a timer may be started. If the X2 interface does not receive the response message or receives the failure message within the specified time, the new eNB sends a notification message to the MME through the S1 interface, and the MME transfers the notification message to the source eNB through the S1 interface, and the source eNB is required to initiate the handover preparation process of the X2 and S1 interfaces.

If the eNB of the new cell is different from the MME connected with the source eNB, namely the new MME connected with the new eNB is not an entity with the source MME connected with the source eNB, the new eNB sends a notification message to the new MME through an S1 interface, the new MME transmits the notification message to the source MME through an S10 interface, and the source MME forwards the notification message to the source eNB to request the source eNB to initiate a handover preparation process of the S1 interface.

If the new cell is a UMTS/GSM cell, the access network equipment RNC/BSC of the new cell corresponds to the eNB of the new cell, the Iu/A interface corresponds to the S1 interface, the RNC/BSC sends a notification message to the SGSN through the Iu/A interface, the SGSN sends the notification message to the MME through the S3 interface message, and the MME forwards the notification message to the source eNB through the S1 interface, and requests the source eNB to perform S1 handover preparation process. Before the source eNB and the MME switch the S1 interface, a notification response message can be sent to the RNC/BSC through the SGSN. The message sent by the UE to the new cell after detecting the RLF may be an RRC reestablishment or a cell update message.

In the embodiment of the invention, the new cell access network equipment (eNB or RNC/BSC) triggers the connection with the new cell core network equipment MME/SGSN by sending the notification message to the source eNB or the source MME, thereby ensuring the continuity of the UE service in the activated state.

Example 5

In this embodiment, if the new cell takes an LTE cell as an example, the access network device of the new cell in this embodiment is an eNB of the new cell, that is, a new eNB. As shown in fig. 9, the method includes:

in step 701, the UE finds the RLF, reselects a new cell, and sends an RRC reestablishment request to an eNB of the new cell (new eNB). The RRC reestablishment request includes UE context, and the new eNB may obtain the context of the UE from the RRC reestablishment request. Optionally, the RRC reestablishment request may also carry a UE identity (S1AP ID), which may be, for example, an S-TMSI (SAE temporary mobile station identity) or an IMSI (international mobile subscriber identity), and/or an S1 interface application identity of the source MME and the UE.

In step 702, the new eNB sends an S1 interface message to the MME requesting to establish an S1 connection, such as a path switch (pathswitch) message or a HANDOVER notification (HANDOVER NOTIFY) or other S1 interface message.

In step 703, the new eNB receives an S1 interface response message from the MME.

Step 704, sending an RRC reestablishment success message to the UE.

If the S1 interface response message is not received from the MME within the set time in step 703, an RRC reestablishment failure message is sent to the UE in step 704.

Optionally, step 704 may be followed by:

step 705, the MME sends an S1 interface release command to the source eNB to notify the source eNB to release the S1 interface.

If the MME connected with the new eNB and the source eNB is different, namely the new eNB is connected with the new MME and the source eNB is connected with the source MME, the two MMEs can transfer messages through an S10 interface, the new eNB sends a message for informing the source eNB to release the S1 interface to the new MME through an S1 interface, then the new MME forwards the message to the source MME through the S10 interface, and then the source MME informs the source eNB to release the connection of the S1 interface.

If the new cell is a UMTS/GSM cell, the access network device RNC/BSC in the new cell corresponds to the eNB of the new cell, and the Iu/a interface corresponds to the S1 interface, then the RNC/BSC sends an Iu/a interface notification message, which may be a relocation complete message or other Iu/a interface message, to the core network device SGSN in the new cell. The SGSN sends an S3 interface message to the source MME requesting the source eNB to release the S1 interface. The message sent by the UE to the new cell after detecting the RLF may be an RRC reestablishment or a cell update message.

In this embodiment, the access network device eNB/RNC/BSC of the new cell establishes a connection with the MME/SGSN through an S1 interface message or an Iu/a interface message, thereby ensuring the continuity of the UE service in the active state.

Example 6

In this embodiment, if the new cell takes an LTE cell as an example, the access network device of the new cell in this embodiment is an eNB of the new cell, that is, a new eNB. As shown in fig. 10, the method includes:

in step 901, the UE finds the RLF, reselects to a new cell, and sends an RRC reestablishment request message to the eNB of the new cell (new eNB), where the message carries the UE identity, such as S-TMSI or IMSI.

Step 902 or 902', the new eNB sends an X2 interface message to the source eNB or an S1 interface message to the core network MME requesting UE context with the UE identity, e.g. S-TMSI or IMSI.

In step 903 or 903', after the source eNB/MME receives the X2 interface message or the S1 interface message, it transfers the UE context to the new eNB according to the UE identity, e.g., S-TMSI or IMSI.

In step 904, the new eNB sends an S1 interface message requesting to establish an S1 interface connection with the MME, where the S1 interface message may be a path switch message (e.g., a path switch message), a HANDOVER notification message (e.g., a HANDOVER NOTIFY message), or another S1 interface message.

In step 905, the new eNB receives an S1 interface response message from the MME.

Step 906, the new eNB sends RRC reestablishment success to the UE.

If the new eNB does not receive the S1 interface response message from the MME in step 905, an RRC reestablishment failure message is transmitted to the UE in step 906.

Optionally, step 906 may be followed by:

in step 907, the MME sends an S1 interface release command to the source eNB to notify the source eNB to release the S1 interface.

If the MME connected with the eNB of the new cell and the source eNB is different, the two MMEs can transfer messages through an S10 interface, and the source MME informs the source eNB to release the connection of the S1 interface.

In step 902:

if the eNB of the new cell does not know the eNB operation status of the source cell at the time, if there is an X2 interface, a request message for an X2 interface may be first sent to request the source eNB to deliver a UE context. A timer may be started at the same time. If the X2 interface does not receive the response message or receives the failure message within the specified time, the new eNB sends a request message of the S1 interface to the MME, and the MME is required to transfer the UE context, wherein the request message contains the UE identity such as S-TMSI or IMSI.

If the MME connected with the eNB of the new cell and the MME connected with the source eNB are different, namely the new eNB is connected with the new MME, the source eNB is connected with the source MME, the two MMEs can transmit messages through an S10 interface, and the new MME transmits a request message to the source MME through an S10 interface, wherein the request message contains a UE identifier, such as S-TMSI or IMSI, and requires the source MME to transmit UE context; or the source MME forwards this request message to the source eNB, asking the source eNB to deliver the UE context.

If the new cell is a UMTS/GSM cell, the access network equipment RNC/BSC of the new cell corresponds to the eNB of the new cell, the Iu/A interface corresponds to the S1 interface, the RNC/BSC sends a request message of the Iu/A interface to the core network equipment SGSN of the new cell, and the SGSN sends the request message to the MME through the S3 interface to request the MME to transfer the UE context; or after receiving the request message, the MME sends the request message to the eNB to request the eNB to send the UE context.

The new cell is a UMTS/GSM cell and the Iu/a interface message corresponds to the above-mentioned path switch message or handover notify message or other S1 interface message, such as relocation complete message or other Iu/a interface message. And the message sent by the UE to the new cell after detecting the RLF may be an RRC reestablishment or a cell update message.

In this embodiment, the access network device of the new cell establishes a connection with the MME/SGSN through an S1 interface message or an Iu/a interface message, thereby ensuring continuity of the UE service in the active state.

It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.

Example 7

An embodiment of the present invention provides a service recovery apparatus 200 of a wireless communication network, as shown in fig. 11, the apparatus includes: a receiving unit 210, an RRC establishing unit 230, and a processing unit 240. Wherein, the receiving unit 210 receives an RRC reestablishment request or a cell update message from the user equipment; the RRC establishing unit 230 performs an RRC establishing procedure initiated by the non-access stratum of the ue when RRC reestablishment fails or cell update fails; after the RRC establishment procedure is completed, the processing unit 240 sends an initial ue message to the core network device.

As another embodiment of the present invention, as shown in fig. 12, the apparatus 200 may further include: a context establishing unit 250, configured to receive an initial context establishing request from a core network device, and send a context establishing response to the core network device. Optionally, the apparatus may further include a failure response unit 220, configured to send an RRC reestablishment failure message or a cell update failure message to the ue when the RRC reestablishment request or the cell update does not carry the context information of the ue.

Example 8

An embodiment of the present invention provides a service recovery apparatus 300 of a wireless communication network, as shown in fig. 13, the apparatus includes: a receiving unit 310 and a transmitting unit 340. Wherein, the receiving unit 310 receives an RRC reestablishment request or a cell update message from the user equipment; when the context information of the user equipment cannot be known, the sending unit 340 sends a notification message to the source access network device to request the source access network device to initiate a handover procedure preparation procedure of the X2 and/or S1 interface.

As another embodiment of the present invention, as shown in fig. 14, the apparatus 300 may further include: a failure response unit 320 and an RRC establishment unit 330. When the context information of the ue cannot be obtained, the failure response unit 320 sends a corresponding RRC reestablishment failure message or a cell update failure message to the ue; the RRC establishing unit 330 performs the non-access stratum initiated RRC establishment procedure of the user equipment.

Further, the sending unit is further configured to send a notification message to the source access network device through an X2 interface; when a notification response message is not received or a failure message is received within a set time, the notification message is sent to a source core network device, and the source core network device forwards the notification message to the source access network device; or the sending unit is further configured to send the notification message to a source core network device, and the source core network device forwards the notification message to the source access network device.

Example 9

The present embodiment provides a service restoration apparatus 400 of a wireless communication network, as shown in fig. 15, including: a receiving unit 410, an obtaining unit 420 and a sending unit 430.

The receiving unit 410 receives an RRC reestablishment request or a cell update message from the ue, where the RRC reestablishment request or the cell update message carries context information and/or a ue identifier of the ue; the obtaining unit 420 obtains context information of the user equipment; the sending unit 430 sends a notification message to the core network device to request to establish a connection with the core network device.

Specifically, the obtaining unit 420 is further configured to obtain context information of the ue from the RRC reestablishment request or the cell update message when the RRC reestablishment request or the cell update message carries the context information of the ue; or, when the RRC reestablishment request or the cell update message does not carry the context information of the user equipment, sending a request message to the source access network device or the source core network device, where the request message carries the user equipment identifier.

More specifically, when the RRC reestablishment request or the cell update message does not carry context information of the user equipment, the obtaining unit 420 is further configured to send the request message to the source access network device through an X2 interface; and when the notification response message is not received or the failure message is received within the set time, the request message is sent to the source core network equipment.

In the above embodiments of the present invention, the service recovery apparatus of the wireless communication network may be an eNB in an LTE system, or may be an RNC/BSC in UMTS/GSM.

An embodiment of the present invention further provides a service recovery system for a wireless communication network, where the system can implement the service recovery method for the wireless communication network in embodiments 1 to 6, and the system includes the service recovery device for the wireless communication network and the core network device provided in embodiments 7, 8, or 9.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A method for traffic restoration in a wireless communication network, comprising:

the target access network equipment receives a Radio Resource Control (RRC) reestablishment request sent by user equipment;

the target access network equipment sends a notification message to source access network equipment, wherein the notification message is used for triggering the source access network equipment to initiate a switching preparation process with the target access network equipment;

the target access network equipment sends an RRC reestablishment failure message to the user equipment, wherein the RRC reestablishment failure message is used for carrying out an RRC establishment process triggered by a non-access stratum of the user equipment;

wherein the RRC establishment procedure comprises a cause value indicated by the user equipment, the cause value indicating that the RRC establishment procedure is a non-access stratum triggered link recovery procedure of the user equipment.

2. The method of claim 1, further comprising:

and the target access network equipment acquires the context of the user equipment through the switching preparation process so as to ensure the service continuity of the user equipment in an activated state.

3. The method according to claim 1 or 2, wherein the sending, by the target access network device, the notification message to the source access network device specifically includes:

the target access network equipment sends a notification message to the source access network equipment, if a notification response message is not received or a failure message is received within a set time, the notification message is sent to the source core network equipment, and the source core network equipment forwards the notification message to the source access network equipment; or

And the target access network equipment sends the notification message to the source core network equipment, and the source core network equipment forwards the notification message to the source access network equipment.

4. A method for traffic restoration in a wireless communication network, comprising:

user equipment sends a Radio Resource Control (RRC) reestablishment request to target access network equipment, and the RRC reestablishment request is used for sending a notification message to source access network equipment by the target access network equipment, wherein the notification message is used for triggering the source access network equipment to initiate a handover preparation process with the target access network equipment;

the user equipment receives an RRC reestablishment failure message sent by the target access network equipment, wherein the RRC reestablishment failure message is used for carrying out an RRC establishment process triggered by a non-access stratum of the user equipment;

wherein the RRC establishment procedure comprises a cause value indicated by the user equipment, the cause value indicating that the RRC establishment procedure is a non-access stratum triggered link recovery procedure for the user equipment.

5. The method of claim 4, further comprising:

based on the context of the user equipment obtained by the handover preparation procedure, the user equipment maintains service continuity in an active state.

6. A traffic restoration apparatus for a wireless communication network, comprising:

a receiving unit, configured to receive a radio resource control RRC reestablishment request sent by a user equipment; and

a sending unit, configured to send a notification message to a source access network device, where the notification message is used to trigger the source access network device to initiate a handover preparation process with a target access network device;

the sending unit is further configured to send an RRC reestablishment failure message to the user equipment, where the RRC reestablishment failure message is used to perform an RRC establishment procedure triggered by a non-access stratum of the user equipment;

7. The apparatus of claim 6, further comprising:

an obtaining unit, configured to obtain, through the handover preparation procedure, a context of the ue, so as to ensure service continuity of the ue in an active state.

8. The apparatus of claim 6 or 7, wherein:

the sending unit is further configured to send the notification message to a source core network device if a notification response message is not received or a failure message is received within a set time, and the source core network device forwards the notification message to the source access network device; or

The sending unit is further configured to send the notification message to a source core network device, and the source core network device forwards the notification message to the source access network device.

9. A traffic restoration apparatus for a wireless communication network, comprising:

a unit configured to send a radio resource control RRC reestablishment request to a target access network device by a user equipment, where the RRC reestablishment request is used for the target access network device to send a notification message to a source access network device, and the notification message is used to trigger the source access network device to initiate a handover preparation process with the target access network device; and

means for receiving, by the user equipment, an RRC reestablishment failure message sent by the target access network equipment, where the RRC reestablishment failure message is used for performing an RRC establishment procedure triggered by a non-access stratum of the user equipment;

10. The apparatus of claim 9, further comprising:

means for maintaining service continuity in an active state by the user equipment based on the context of the user equipment obtained by the handover preparation procedure.