WO2011044832A1

WO2011044832A1 - Switching method, device and system

Info

Publication number: WO2011044832A1
Application number: PCT/CN2010/077664
Authority: WO
Inventors: 刘建军; 马新友; 王自强
Original assignee: 华为技术有限公司
Priority date: 2009-10-16
Filing date: 2010-10-12
Publication date: 2011-04-21
Also published as: CN102045799A; CN102045799B

Abstract

A switching method, device and system are disclosed in the embodiments of the present invention which refer to a field of mobile communication technology. The switching method provided by the embodiments of the present invention includes: when a user equipment is in the connection holding state after switching from a first network to a second network, via an interface between a source base station subsystem (BSS) and a target base station subsystem (BSS) in the second network, receiving a switching request sent by the source base station subsystem; switching the user equipment according to the switching request. With the present invention, re-switching flow can be optimized and re-switching time can be shortened.

Description

Switching method, device and system

The present application claims priority to Chinese Patent Application No. 200910206827.7, entitled "A Switching Method, Apparatus and System", filed on October 16, 2009, the entire contents of in. Technical field

The present invention relates to the field of mobile communication technologies, and in particular, to a handover technology between user equipments and base station subsystems. BACKGROUND OF THE INVENTION Currently, there are multiple standards in the network, such as: GSM (Global System for Mobile Communications) in 2G networks, and WCDMA (Wideband Code Division Multiple Access) in 3G networks. TD-SCDMA (Division-Synchronous Code Division Multiple Access), CDMA2000 (Code Division Multiple Access 2000), and the like. Therefore, there are various interoperable operations between the various systems described, such as: 2G to 3G CS (Circuit Switched Domain) switching, 3G to 2G CS switching, and the like. In order to better interoperate between 2G network and 3G network, in the process of cross-system handover, for example: handover between GSM and TD-SCDMA systems, BSS (Base Station Subsystem) and RNS (Radio Network) Subsystem, the wireless network subsystem) directly interacts with the Iur-g interface in the access network. However, when the user equipment switches from the 3G network to the 2G network and uses the Iur-g interface to perform the connection hold, if the user equipment re-crosses the BSS between the 2G networks, the RNS needs to complete the handover process across the BSS. . As shown in Figure 1, the specific process is as follows:

101. After the user equipment switches from the 3G network to the 2G network, the Iur-g connection is maintained. 102. The source base station subsystem S-BSS determines that the user equipment needs to be handed over to the target base station subsystem T-BSS, and then sends an enhanced Relocation Required message to the RNS, where the message carries the target cell CGI (Common Gateway Interface, public) Gateway interface), switch reason, etc. 103. If the RNS and the T-BSS have an Iur-g interface, the RNS sends an Enhanced Relocation Request message through the Iur-g interface to notify the T-BSS to perform handover resource allocation.

104. After completing the handover resource allocation, the T-BSS returns an enhanced Regency Response (Enhanced Relocation Response) message to the RNS. 105. RNS sends an enhanced migration command to S-BSS (Enhanced Relocation)

Command ) message, which contains the T-BSS switch command.

106. The S-BSS sends a Handover Command message to the user equipment.

107. The user equipment sends a Handover Access message to the T-BSS.

108. The T-BSS sends an enhanced Enhanced Relocation Detect message to the RNC. After receiving the message, the RNC switches the user plane to the T-BSS.

109. The user equipment reports a Handover Complete message to the T-BSS.

110. The T-BSS sends an Enhanced Migration Complete (Enhanced Relocation Complete) message to the RNC to notify the RNS that it has switched to the T-BSS.

111. The RNC sends an Iur-g Release Command message to the S-BSS.

112. After receiving the Iur-g Release Command message, the S-BSS releases the Iur-g signaling and the user plane connection, and returns an Iur-g Release complete message. In the process of implementing the present invention, the inventors have found that at least the following problems exist in the prior art: In the prior art, when the user equipment is switched from the 3G network to the 2G network and the Iur-g interface is used for connection maintenance, if the user equipment is If the inter-BSS handover occurs again in the 2G network, the RNS needs to complete the handover across the BSS, so that the signaling process between the RNS and the S-BSS and the T-BSS is complicated and the handover time is long. Summary of the invention

The embodiment of the invention provides a handover method, device and system, so as to achieve the purpose of optimizing the re-switching process and shortening the re-switching time.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

In an aspect, an embodiment of the present invention provides a method for switching a user equipment between base station subsystems, including: when the user equipment is in a connection hold state after being switched from a first network to a second network, by using the second An interface between the network internal source base station subsystem BSS and the target base station subsystem BSS receives the handover request sent by the source base station subsystem; and switches the user equipment according to the handover request.

In another aspect, an embodiment of the present invention provides a switching apparatus, including:

a handover request receiving unit, configured to receive, by the interface between the endogenous base station subsystem and the target base station subsystem of the second network, when the user equipment is in a connection hold state after switching from the first network to the second network Decoding a handover request sent by the source base station subsystem;

And a switching unit, configured to switch the user equipment according to the handover request.

In still another aspect, an embodiment of the present invention further provides a communication system, including the switching device as described above, and a source base station subsystem in communication with the switching device.

The handover method, device, and system provided by the embodiment of the present invention, when the user equipment is in the connection hold state after switching from the first network to the second network, through the second network internal source base station subsystem BSS and the target An interface between the base station subsystems BSS, the target base station subsystem receives a handover request sent by the source base station subsystem, and switches the user settings according to the handover request Preparing, thereby completing the handover process of the user equipment. With the needs mentioned in the prior art

Compared with the handover between the BSSs, the RNS can directly perform information exchange through the interface between the BSSs to complete the handover process, thereby optimizing the re-switching process and shortening the re-switching time. DRAWINGS

1 is a flowchart of a method for switching user equipment between base station subsystems in the prior art; FIG. 2 is a flowchart of a handover method according to an embodiment of the present invention;

Figure 3 is a schematic diagram of a reference architecture of the Iur-g interface;

FIG. 4 is a flowchart of a handover method according to an embodiment of the present invention;

FIG. 5 is a flowchart of a handover method according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a switching apparatus according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a communication system according to an embodiment of the present invention. detailed description

A switching method, device and system according to an embodiment of the present invention are described in detail below with reference to the accompanying drawings.

As shown in FIG. 2, a handover method is provided according to an embodiment of the present invention. The method includes: 201: When a user equipment is in a connection hold state after being switched from a first network to a second network, the second network internal source base station is used. An interface between the subsystem BSS and the target base station subsystem BSS, receiving a handover request sent by the source base station subsystem;

202: Switch the user equipment according to the handover request.

For a more detailed description of the method and apparatus for switching the user equipment between the base station subsystems, the reference architecture of the Iur-g interface mentioned in the embodiment of the present invention is first described.

As shown in FIG. 3, the reference architecture of the Iur-g interface includes: a radio network subsystem RNS, a first base station subsystem BSS1, a second base station subsystem BSS2, and user equipment; wherein, the RNS is 3G. Network equipment, BSS1 and BSS2 are 2G network devices; RNS and 3G core network can be connected through Iu interface. BSS1 and BSS2 in 2G core network can be connected to 2G core network through A interface respectively. RNS and BSS1 can pass Iur- The g interfaces are connected, and the user equipment and the base station subsystem can be connected through the air interface Um. In this way, when the user equipment switches from the RNS of the 3G network to the BSS1 of the 2G network, the Iur-g interface connection is maintained.

When the user equipment is in the Iur-g interface connection hold state, if the user equipment is in the 2G network, the handover between the base station subsystems between the BSS1 and the BSS2 occurs again, as shown in FIG. 4, which is provided by the embodiment of the present invention. A switching method, the method comprising:

401: When the user equipment is in the connection hold state after switching from the first network to the second network, the target base station subsystem T-BSS receives through the Iur-g interface between the source base station subsystem and the target base station subsystem of the second network. The handover request sent by the source base station subsystem S-BSS.

The first network is a 3G network, and the second network is a 2G network. After the user equipment of the Iur-g interface between the 3G network device and the 2G network device switches from the 3G network to the 2G network, the connection is maintained.

The handover request may be an enhanced migration request message; the message may include parameters such as a target cell identifier, a user equipment identifier, a voice version, and a user equipment capability.

402: Switch the user equipment according to the handover request.

In this step, the T-BSS allocates a radio resource and a corresponding channel to the user equipment according to the received handover request; and, the T-BSS establishes an A-interface connection with the core network CN, and sends a handover complete message to the core network. The core network completes the call migration and the core network instructs the wireless network subsystem to release the Iu resource, thereby completing the handover of the user equipment from the S-BSS to the T-BSS.

The switching method provided by the embodiment of the present invention, when the user equipment passes the Iur-g interface between the 3G network device RNS and the 2G network device BSS, and is in the connection hold state after switching from the 3G network to the 2G network, the second network is The Iur-g interface between the end-point base station subsystem and the target base station subsystem, the target base station subsystem receives the handover request sent by the source base station subsystem, and switches the user equipment according to the handover request, thereby completing the handover process of the user equipment. In the prior art Compared with the RNS to complete the handover between the BSSs, the embodiment of the present invention can directly perform information exchange through the Iur-g interface between the BSSs, and complete the handover process, thereby optimizing the re-switching process and shortening the re-switching process. Switch time.

As shown in FIG. 5, it is a handover method provided by an embodiment of the present invention, and the specific implementation process of the method is as follows:

When the user equipment is in the Iur-g connection hold state after switching from the 3G network to the 2G network, the S-BSS determines, according to the measurement report sent by the user equipment, that the user equipment needs to perform handover between the BSSs in the 2G network, that is, the S-BSS To switch to T-BSS, and the Iur-g interface exists between S-BSS and T-BSS, perform the following steps:

501. The T-BSS receives the Enhanced Relocation sent by the S-BSS through the Iur-g interface.

Request (Enhanced Migration Request) message.

502. The T-BSS allocates a radio resource and a corresponding channel to the user equipment, so as to prepare the user equipment to switch to the T-BSS.

503. After the T-BSS completes resource configuration for the user equipment, send an Enhanced Relocation Response message to the S-BSS through the Iur-g interface, to notify the S-BSS that the switch can be performed.

504. The S-BSS receives the Enhanced Relocation Response message from the T-BSS, and sends a Handover Command message to the user equipment to notify the user equipment to perform switching between the BSSs.

505. The user equipment sends a Handover Complete message to the T-BSS, and the T-BSS handover is notified.

506. After receiving the Handover Complete message of the user equipment, the T-BSS sends an Enhanced Handover Complete message to the CN, where the message is used by the T-BSS to request the core network to perform call migration and the A interface between the CN and the T-BSS.

The enhanced handover complete message may include a connection identifier, a current voice version, a transport layer address, a QOS, and the like. 507. After the CN call migration is completed, the Enhanced Handover Complete Ack message is replied to the T-BSS, and the T-BSS migration is notified.

The enhanced handover complete confirmation message may include a connection identifier, a transport layer address, a QOS, and the like.

508. The CN initiates an Iu release message to the RNS.

509. The T-BSS initiates an Iur-g release message to the S-BSS.

According to a handover method provided by the embodiment of the present invention, the source base station subsystem determines that the user equipment is in the Iur-g connection hold state after switching from the 3G network to the 2G network, and the Iur- exists between the current source base station subsystem and the handover target base station subsystem. The g interface, the source base station subsystem can directly perform the handover request with the target base station subsystem by using the Iur-g interface between the source base station subsystem and the handover target base station subsystem, thereby completing the handover process of the user equipment, and the prior art Compared with the RNS to complete the handover between the BSSs, the embodiment of the present invention can directly perform information exchange through the Iur-g interface between the BSSs, thereby completing the handover process, thereby optimizing the re-switching process and shortening the process. Switch the time again.

Further, the method for switching the user equipment between the base station subsystems in the embodiment of the present invention may also directly send the enhanced handover complete request message through the T-BSS to complete the call migration of the user equipment in the core network, and the core network and the T-BSS. The A interface is established between.

As shown in FIG. 6, a handover apparatus is provided in the embodiment of the present invention. The apparatus includes: a handover request receiving unit 601, configured to: when a user equipment is in a connection hold state after being switched from a first network to a second network, The interface between the source base station subsystem and the target base station subsystem of the second network receives the handover request sent by the source base station subsystem.

The switching unit 602 is configured to switch the user equipment according to the handover request received by the handover request receiving unit 601.

The first network is a 3G network, and the second network is a 2G network. The connection hold state is an Iur-g interface connection hold state after the user equipment switches from the 3G network to the 2G network, and correspondingly, the handover request receiving unit 601 is used. : After the user equipment switches from the 3G network to the 2G network When the Iur-g interface connection is maintained, the handover request sent by the source BSS is received through the lur-g interface between the source BSS and the target BSS of the 2G network.

The switching unit 602 may further include:

a resource allocation subunit, configured to allocate a radio resource and a corresponding channel to the user equipment according to the handover request received by the handover request receiving unit 601;

a response subunit, configured to send a handover response to the source base station subsystem by using the lur-g interface, so that the source base station subsystem notifies the user equipment to perform system handover;

The message receiving subunit is configured to receive a handover complete message sent by the user equipment.

In the process of implementing the handover between the S-BSS and the T-BSS, the apparatus may further include: a message sending unit, configured to send a handover complete message to the core network, so that the core network completes the call migration, and the core network indicates the wireless network subsystem. Release Iu resources;

The message receiving unit is configured to receive a handover completion acknowledgement message sent by the core network.

In the process of implementing the handover between the S-BSS and the T-BSS, the apparatus may further include: a resource release message sending unit, configured to send a release lur-g resource message to the source base station subsystem. As shown in FIG. 7, a communication system according to an embodiment of the present invention includes: a switching device 701 as described above, and a source base station subsystem 702 in communication with the switching device; wherein the source base station in communication with the switching device Subsystem 702 includes:

a judging unit, configured to determine a lur-g interface connection holding state that is in a user equipment after being switched from a 3G network to a 2G network;

a handover request sending unit, configured to send a handover request to a target base station subsystem T-BSS through a lur-g interface between the source base station subsystem S-BSS and the target base station subsystem T-BSS of the 2G network; and switch the response receiving unit, For receiving a target base station subsystem through the above lur-g interface

The handover response sent by the T-BSS;

And a switching unit, configured to switch the user equipment to the target base station subsystem T-BSS according to the received handover response.

In the process of implementing S-BSS and T-BSS to complete handover, the source base station subsystem 702 may also To include:

The handover command sending unit is configured to send a handover command to the user equipment.

In the process of implementing S-BSS and T-BSS to complete handover, the source base station subsystem 702 may further include:

The message receiving unit is configured to receive a release lur-g resource message sent by the target base station subsystem. The handover method, device and system provided by the embodiment of the present invention, the source base station subsystem S-BSS determines that the user equipment is in the lur-g interface connection hold state after switching from the 3G network to the 2G network, and the current source base station subsystem S- There is a lur-g interface between the BSS and the handover target base station subsystem T-BSS. Then, the source base station subsystem has a lur-g interface and a target base station through the source base station subsystem S-BSS and the handover target base station subsystem T-BSS. The system T-BSS directly performs the handover request, thereby completing the handover process of the user equipment. Compared with the handover between the BSSs required by the RNS in the prior art, the embodiment of the present invention can pass the lur between the BSSs. The g interface directly performs information exchange and completes the switching process, thereby optimizing the re-switching process and shortening the re-switching time.

The method for switching the user equipment between the base station subsystems in the embodiment of the present invention can also directly send the enhanced handover complete request message through the T-BSS to complete the call migration of the user equipment in the core network and between the core network and the T-BSS. The A interface is established.

Through the description of the above embodiments, those skilled in the art can understand that all or part of the steps of the foregoing embodiment can be implemented by a program to instruct related hardware, and the program can be stored in a computer readable manner. In the storage medium, when the program is executed, the method includes the steps of the foregoing method embodiment, such as: ROM/RAM, magnetic disk, optical disk, and the like.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Rights request

A switching method, comprising:

Receiving the source base station subsystem through an interface between the second network end source base station subsystem BSS and the target base station subsystem BSS when the user equipment is in a connection hold state after switching from the first network to the second network The switching request sent;

Switching the user equipment according to the handover request.

The handover method according to claim 1, wherein the first network is a 3G network, the second network is a 2G network, and the connection holding state is that the user equipment switches from a 3G network to a 2G network. The Iur-g interface connection that is in the network is maintained.

Receiving, by the interface between the source base station subsystem and the target base station subsystem of the second network, the handover request sent by the source base station subsystem, including:

And receiving, by the Iur-g interface between the source BSS and the target BSS of the 2G network, a handover request sent by the source BSS.

The switching method according to claim 2, wherein the step of switching the user equipment according to the switching request comprises:

And allocating a radio resource and a corresponding channel to the user equipment according to the handover request; sending a handover response to the source base station subsystem by using an Iur-g interface between the source BSS and the target BSS of the 2G network, so that The source base station subsystem notifies the user equipment to perform system switching;

Receiving a handover complete message sent by the user equipment.

The handover method according to claim 3, further comprising: establishing a connection between the target base station subsystem and the core network, and sending a handover complete message to the core network, so that the core network Complete call migration and the core network instructs the wireless network subsystem to release Iu resources;

Receiving a handover complete confirmation message sent by the core network.

The method according to any one of claims 2 to 4, characterized in that In the process of completing the handover between the base station subsystems, the method further includes: sending a release Iur-g resource message to the source base station subsystem.

6. A switching device, comprising:

The switching device according to claim 6, wherein the first network is a 3G network, the second network is a 2G network, and the connection holding state is that the user equipment switches from a 3G network to a 2G network. The Iur-g interface connection that is in the network is maintained.

The handover request receiving unit is configured to: when the user equipment is in the Iur-g interface connection hold state after switching from the 3G network to the 2G network, pass the Iur-g interface between the source BSS and the target BSS of the 2G network Receiving a handover request sent by the source BSS.

The switching device according to claim 7, wherein the switching unit comprises:

a resource allocation subunit, configured to allocate a radio resource and a corresponding channel to the user equipment according to the handover request;

a response subunit, configured to send a handover response to the source base station subsystem by using an Iur-g interface between the source BSS and the target BSS of the 2G network, so that the source base station subsystem notifies the user equipment System switching

The switching device according to claim 8, wherein the device further comprises: a message sending unit, configured to send a handover complete message to the core network, so that the core network completes the call migration and the core network indicates the wireless network subsystem. Release Iu resources;

The message receiving unit is configured to receive a handover completion confirmation message sent by the core network.

The switching device according to any one of claims 7 to 9, characterized in that The device also includes:

And a resource release message sending unit, configured to send a release Iur-g resource message to the source base station subsystem.

A communication system, comprising: the switching device according to any one of claims 6 to 10, and a source base station subsystem in communication with the switching device.