WO2007085193A1

WO2007085193A1 - Method and system for releasing handover resources

Info

Publication number: WO2007085193A1
Application number: PCT/CN2007/000274
Authority: WO
Inventors: Li Jiang; Pin Chen; Xuehai Qiu; Zhidong Yang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-01-25
Filing date: 2007-01-25
Publication date: 2007-08-02
Also published as: CN1878346A; CN100446584C

Abstract

A method and system for releasing handover resources are disclosed, the method includes the following steps: the first mobile switching device initiates the resources checking to the second switching device, releasing the correlate resources on the first mobile switching device if the first switching device determines the checking is failed. The releasing method and system disclosed in the present invention enables the normal releasing of the correlate resources on the mobile switching device by the checking of the resources inter-offices when the handover is performed inter-offices, and the resources utility rate is also improved.

Description

Method and system for releasing switching resources This application claims to be filed on January 25, 2006 with the Chinese Patent Office, application number 200610033397.x, and the invention titled "Release Method and System of Mobile Switching Center Resources", Priority of Chinese Patent Application The entire contents of which are incorporated herein by reference.

Technical field

The present invention relates to the field of communications, and in particular to a method and system for releasing a handover resource. Background technique

The mobile subscriber (hereinafter referred to as the mobile station) may initiate an inter-office handover due to a change in location during the data service process. The handover is as shown in FIG. 1. The specific handover and disconnection procedure is as follows: The first mobile service switching center (Mobile) The Service Switching Center (MSC) initiates a handover request message to the second MSC when the mobile station needs to switch to the second MSC during the data service for the mobile station (FACDIR2, after the second MSC receives the handover request message, allocates the mobile station Related resources, the related resources include a wireless channel, a terrestrial circuit, etc., and return a handover response message (facdir2) to the first MSC after the assignment is successful. After the handover succeeds, the second MSC sends a handover complete message (MSONCH) to the first MSC. After the mobile station completes the handover, if the mobile station disconnects the line at the handover party, the second MSC sends a disconnection request message (DROPSERV) to the first MSC, and the first MSC releases the relevant resource after receiving the disconnection request message. And sending a disconnection response message (dropserv) to the second MSC, and the second MSC releases the relevant resource after receiving the disconnection response message. Source.

However, in some cases (such as inter-office link flashing, etc.), the inter-office disconnect request message is lost, so that the first MSC retains the established resources because it has not received the disconnect request message. For the first MSC, since the disconnection request message is not received, it is considered that the mobile user's call is still continuing, and the currently established resources are not released. Since the mobile subscriber status in the visitor location register (VLR) is always in a call state, the call cannot be initiated again, which inevitably affects the mobile subscriber's bill, and will also cause the first MSC's resources to be permanently occupied.

In TIA/EIA-41-D, there has been a corresponding deal with the loss of inter-office disconnection messages for TDM voice switching. If the MSC initiates the disconnection (FACREL) and does not receive the disconnection response message (facrel), the disconnection message will be resent, and if the disconnection response message is not received after a certain number of retransmissions, the reset circuit will be operated. For details, please refer to section 5.2.5.1 of TIA/EIA-41-D ». However, the above file does not fundamentally solve the problem of lost message disconnection, because the MSC that receives the disconnection message can release the resource only after receiving the disconnection message of the game, which completely depends on the message of the game. If you have been unable to receive the disconnect message from the retransmission, the resource cannot be released.

Summary of the invention

The technical problem to be solved by the embodiment of the present invention is to provide a method and system for releasing a handover resource, which is a defect that the resource cannot be released due to the loss of the inter-office disconnection message during the inter-office handover in the prior art.

The technical solution adopted by the embodiment of the present invention to solve the technical problem is: a method for switching resources, including the following steps: The first mobile switch initiates resource verification to the second mobile switch, if

L0, the first mobile switch determines that the resource check fails, and releases related resources on the first mobile switch.

An embodiment of the present invention provides a device for releasing a handover resource, including a verification unit and a handover unit, where the verification unit is configured to initiate a resource check to a peer mobile switch, and if the resource check fails, notify the handover unit to Related resources.

An embodiment of the present invention further provides a handover resource release system, including a first mobility switch and a second mobility switch, where the first mobility switch is configured to initiate resource verification to the second mobility switch, and according to After the response of the second mobile switch determines that the resource check fails, the related resources on the first mobile switch are released; and the second mobile switch is configured to respond to the resource check of the first mobile switch.

The method and system for switching resources of the embodiment of the present invention, through inter-office resource verification, enable normal release of related resources on the mobile switch during inter-office handover, thereby improving resource utilization. DRAWINGS

1 is a schematic diagram of an inter-office handover of an existing mobile station;

2 is a schematic diagram of handover resource release of an MSC according to an embodiment of the present invention;

FIG. 3 is a structural block diagram of an MSC according to an embodiment of the present invention; FIG.

4 is a schematic flow chart of switching resources after being released in an embodiment of the present invention;

FIG. 5 is a schematic flow chart of resource verification in an embodiment of the present invention.

detailed description

In the embodiment of the present invention, the inter-office resource check is initiated by the mobile switch, and it is determined according to the verification result. The related resources on the mobile switch are released, so that related resources on the mobile switch can be normally released during the inter-office handover. The first mobile switch and the second mobile switch according to the embodiment of the present invention respectively include a Mobile Services Switching Center (MSG) or a Mobile Services Switching Center emulation (MSCe). The MSC is used as an example to describe how the first MSC performs resource check on the second MSC to release the handover resources. The processing flow of the MSCe is the same as that of the MSC.

2 is a schematic diagram of handover resource release of an MSC. When a mobile station switches from a first MSC to a second MSC and is in a steady state of handover, timing is started. After the first MSC finds that it is in the steady state for a certain period of time, that is, after the switching steady state time reaches the first predetermined time, it initiates a resource check request message to the second MSC and starts a resource check timer. The resource verification request message includes a mobile station identifier (Mobile Station ID) or an inter-office switching circuit number (Inter MS C Circuit ID), where the first predetermined time is a preset first MSC reaching a switching steady state. The time gate P is depreciated.

After receiving the resource check request message from the first MSC, the second MSC determines whether the state between the mobile station and the second MSC is in a steady state according to the identifier of the mobile station or the inter-office switching circuit number, for example, determining the mobile station and the second Whether the circuit resources between the MSCs are in an occupied state, or whether the IP resources between the mobile station and the second MSC are in an occupied state or whether resources of each module in the MSC are in a stable state of switching, if between the mobile station and the second MSC If the circuit resource is in an occupied state, or the IP resource between the mobile station and the second MSC is in an occupied state, or the resources of each module in the MSC are in a stable state, determining that the switching state of the mobile station and the second MSC is in a steady state, then The second MSC returns a resource verification success response message to the first MSC, where the message includes a verification success flag; if the circuit resource between the mobile station and the second MSC is in an idle state, or an IP between the mobile station and the second MSC If the resource is in an idle state, or the resources of each module in the MSC are in an unstable state, MSC returns a resource verification failure response message, the message comprising the verification failure flag.

The first MSC receives the resource verification success response message of the second MSC, and determines that the resource verification is successful, and does not: perform any operation, or restarts the switching steady state timer, and waits for a certain time to re-check the resource; if the first MSC receives Returning the resource verification failure response message to the second MSC, determining that the resource verification fails, releasing the related resource; if the resource verification time exceeds the second predetermined time, and the first MSC has not received the resource verification response message from the second MSC, A MSC judges the resource core If the check fails, the related resources are released, where the second predetermined time is a preset time threshold of the resource check response message received by the first MSC.

In order to implement the release of the second MSC, the second MSC in the embodiment of the present invention also has the resource verification capability. When the mobile station reaches the switching steady state, the second MSC starts the switching 5 on the steady state. After the switching of the steady-state timer expires, the second MSC starts the resource check to achieve the purpose of the handover of the resource. The resource verification process is consistent with the resource verification process initiated by the first MSC, and details are not described herein.

In order to achieve the release of the second MSC, in the embodiment of the present invention, the following solution may also be implemented: After the handover of the first MSC to the second MSC is completed, the mobile station initiates a disconnection on the second MSC, 10 and passes The second MSC forwards the disconnection request message to the first MSC, or the second MSC initiates the disconnection, and sends the disconnection request message to the first MSC, and the second MSC starts the timing waiting for the disconnection response message, if the second After the MSC has not received the disconnection response message after the third predetermined time, the second

The MSC releases related resources thereon, wherein the third predetermined time is a time threshold of the preset second MSC receiving the disconnection response message.

L5 is a mobile service switching center according to an embodiment of the present invention.

A block diagram of a specific embodiment of the MSC, the MSC in this embodiment includes a switching module 34, a switching steady state timer 31, a resource checking module 32, and a resource checking timer 33, wherein the resource checking module 32 is respectively connected to the switching steady state. The timer 31 and the resource check timer 33 are connected to the switch steady state timer 31 and the resource check module 32.

The switching module 34 is similar to the switching module in the existing system, and is configured to send a handover request message to the mobile service switching center of the opposite end when the handover is performed, and return to the disconnection after receiving the disconnection request message of the opposite end or releasing the resource message. Respond to messages and release related resources.

Switching the steady state timer 31 and the resource check timer 33 for timing, respectively, by the switching module

34 and the resource verification module 32 triggers to time the switching steady state time and the resource verification time respectively. 5 The above two logical timers can be implemented by two physical timers. In addition, the switching steady state timer

The resource check timer 33 and the resource check timer 33 can also be implemented by a physical timer, which is triggered by the switch module 34 and the resource check module 32 at different stages, thereby implementing different timing strategies. That is, it is controlled by the switching module 34 before the resource check to switch the steady state timing; and in the resource verification phase, the resource check module 32 controls the resource check timing. The resource check module 32 is configured to perform resource check, and send a resource check request message to the peer mobile service switching center after the handover steady state timer 31 exceeds the first predetermined time, and start the resource check timer 33. The resource verification module 32 is further configured to receive a resource verification response message from the peer mobile service switching center, and determine, according to the resource verification response message, whether the resource verification is successful. If the resource check fails, that is, the resource check failure response message is received or the resource check timer 33 exceeds the second predetermined time, the resource check module 32 sends a signal to the switch module 34 to cause the switch module 34 to release the relevant resources.

The mobile switch provided by the embodiment of the present invention includes a first timer, a second timer, a checking unit, and a switching unit, where the first timer is used to achieve the switching steady state, and the timing is sent to the checking unit. Taking the MSC shown in FIG. 3 as an example, the first timer is a switching steady state timer 31; the second timer is used to time the resource verification when it is initiated, and the timing result is sent to the verification unit, The MSC is shown as an example. The second timer is the resource check timer 33. After the first timer reaches the first predetermined time, the check unit initiates a resource check to the peer mobile switch. If the check succeeds, the control unit If the resource check fails (ie, the resource check failure response message is received or the second timer expires for a second predetermined time), the switching unit is notified to release the related resources, for example, the MSC shown in FIG. The verification unit is the resource verification module 32; the switching unit is the switching module 34 shown in FIG.

Further, the mobile switch in the embodiment of the present invention may further include a third timer, where the third timer is used to start timing after the handover between the first mobile switch and the second mobile switch is completed, and the timing result is sent to the switching unit. Then, the switching unit is further configured to receive the response message of the disconnection request, and the corresponding resource is released after the response message is not received within the third predetermined time counted by the third timer.

The system for releasing a switching resource provided by the embodiment of the present invention includes a first mobile switch and a second mobile switch, where

After the first mobile switch reaches the first predetermined time, sending a resource check request to the second mobile switch, and determining, according to the resource check response message returned by the second mobile switch, whether the resource check is successful, and if the resource check is successful, re-time; If the resource verification fails, then # put the relevant resources on the first mobile switch;

The second mobility switch generates a resource check response message according to the resource check request and sends a resource check response message to the first mobile switch.

FIG. 4 is a flowchart of a method for dry-moving a mobile service switching center resource according to an embodiment of the present invention. In this reality In the embodiment, it is assumed that the mobile station switches from the first MSC to the second MSC, and the steps are as follows:

S41: The mobile station switches from the first MSC to the second MSC, the first MSC starts to switch the steady state timer 31, and the switching steady state timer 31 is started when the mobile station is in the switching steady state;

S42: If the first MSC does not receive the disconnection request message from the second MSC within a predetermined time (for example, the handover steady-state timer 31 times out), the first MSC starts a resource check to check the first MSC and the second. Whether there is a problem with the connection between the MSCs (such as inter-office link flashing, etc.);

The first MSC determines whether the resource check fails (step S43). If the resource check fails, the related resources on the first MSC are released (step S44); if the resource check is successful, the process returns to step S41.

FIG. 5 is a flow chart of resource verification for releasing a mobile service switching center resource according to an embodiment of the present invention, and the steps are as follows:

S51: In the case that the handover steady-state timer 31 times out, the first MSC sends a resource verification request message to the second MSC to check whether there is a problem in the connection between the first MSC and the second MSC (for example, the inter-office link flashes. Wait);

S52: Start the resource check timer 33 to start timing. The resource check request message includes the identifier (MSID) of the mobile station or the inter-office handover circuit number for performing inter-office handover, where the inter-office handover is performed for the data service. The circuit number is an invalid value, and the verification message may not be based on the interoffice switching circuit number;

S53: The first MSC determines whether a resource verification success response message from the second MSC is received, that is, whether the resource verification response message from the second MSC carries a success flag.

If the first MSC receives the resource check success response message from the second MSC (ie, after the second MSC receives the resource check request message, if the mobile station is in the steady state of the handover state of the second MSC at this time, then An MSC returns a resource verification success response message, which carries a verification success flag, and returns to step S41.

If the first MSC receives the resource check failure response message from the second MSC (ie, after the second MSC receives the resource check request message, if the mobile station is not in the steady state of the handover state of the second MSC at this time, The first MSC returns a resource check failure response message, where the message carries a check failure flag, and then releases related resources on the first MSC (step S56).

If the first MSC does not receive the resource check response message from the second MSC, it checks if the resource check timer 33 has timed out (step S55). If the resource check timer 33 times out, step S56 is executed to release the related resources on the first MSC; if the resource check timer 33 has not timed out, the process returns to step S53.

There is also a resource verification capability on the second MSC. When the mobile station reaches the handover steady state at the second MSC, the second MSC initiates a second handover steady state timer thereon. After the second handover steady-state timer expires, the second MSC initiates a resource verification procedure with the first MSC (as shown in Figures 4 and 5).

In the inter-office handover, the resource allocated to the mobile station cannot be released due to the loss of the inter-office release message. The method of the resource verification is introduced in the embodiment of the present invention, and the mobile switch that is in the steady state for a certain period of time can actively contact the peer end. The mobile switch initiates resource check, and determines whether the resource check is successful by querying whether the mobile switch between the peer mobile switch and the mobile station is in a steady state, and releases the related resources allocated to the mobile station in the case that the resource check fails, thereby improving the resource. Utilization of resources.

The above is only a preferred embodiment, but the scope of protection of the embodiments of the present invention is not limited thereto, and any person skilled in the art can easily think of it within the technical scope disclosed by the embodiments of the present invention. Variations or substitutions are intended to be included within the scope of the embodiments of the invention. Therefore, the scope of protection of the embodiments of the present invention should be determined by the scope of protection of the claims.

Claims

Rights request

A method for releasing a handover resource, comprising:

The first mobile switch initiates a resource check to the second mobile switch, and if the first mobile switch determines that the resource check fails, releasing the related resources on the first mobile switch.

2. The method of claim 1, further comprising: reinitiating resource verification if the first mobile switch determines that the resource verification is successful.

3. The method of claim 2, wherein the first mobile switch initiates resource verification to the second mobile switch before:

The first mobile switch starts to count after the switching steady state is reached, and the resource check is performed when the time is longer than the first predetermined time, where the first predetermined time is a preset setting of the first mobile switch to achieve stable switching. State time threshold.

4. The method according to claim 3, wherein the re-initiating resource verification by the first mobile switch comprises:

The first mobile switch restarts timing until the timeout exceeds the first predetermined time, and the resource check is re-executed.

The release method according to claim 1, wherein the determining, by the first mobility switch, that the resource verification failure comprises:

The first mobile switch sends a resource check request to the second mobile switch, and if the handover state of the mobile station and the second mobile switch is non-steady, the second mobile switch returns resources to the first mobile switch. Checking the failure response message, the first mobile switch determines that the resource verification fails according to the resource verification failure response message;

Or

The first mobile switch sends a resource check request to the second mobile switch, and if the first mobile switch does not receive the response message of the resource check request within the second predetermined time, determining that the resource check fails, where The second predetermined time is a time threshold value of the resource check response message received by the first mobile switch that is preset.

6. The method according to claim 5, wherein the resource verification failure response message carries a verification failure flag.

7. The release method according to claim 6, wherein the first mobile switch Determining the resource verification failure according to the resource verification failure response message includes:

The first mobile switch receives the resource verification failure response message, reads a verification failure flag therein, and determines that the resource verification fails.

The release method according to claim 2, wherein the determining, by the first mobility switch 5, that the resource verification is successful comprises:

The first mobile switch sends a resource check request to the second mobile switch, and if the handover state of the mobile station and the second mobile switch is in a steady state, the second mobile switch returns a resource check to the first mobile switch. The success response message, the first mobile switch determines that the resource check is successful according to the resource check failure response message.

The release method according to claim 8, wherein the resource verification success response message carries a verification success flag.

The dry release method according to claim 9, wherein the determining, by the first mobility switch, that the resource verification succeeds according to the resource verification success response message comprises:

The first mobile switch receives the resource verification success response message, reads the verification L5 success flag therein, and determines that the resource verification is successful.

The method according to any one of claims 5 to 10, wherein the resource verification request carries an identifier of the mobile station that performs handover or an inter-office handover circuit number.

The #放放方法 according to claim 1, wherein the first mobile switch and the second mobile switch respectively comprise a mobile services switching center or a mobile service softswitching center.

A device for releasing a switching resource, comprising: a checking unit and a switching unit, wherein the checking unit is configured to initiate a resource check to the peer mobile switch, and if the resource check fails, notify the switching unit Release related resources.

The apparatus according to claim 13, further comprising a first timer, wherein the first timer is used to perform timing when the switching steady state is reached, and the timing result is sent to the checklist.

15 yuan; the verification unit determines that the first timer reaches a first predetermined time, and then initiates resource verification to the peer mobile switch.

A dry-discharge system for switching resources, comprising: a first mobile switch and a second mobile switch, wherein

The first mobile switch is configured to initiate resource verification to the second mobile switch, and After the response of the second mobile switch determines that the resource check fails, the related resources on the first mobile switch are released;

The second mobility switch is configured to respond to resource verification of the first mobility switch.