CN102202359B - Control method and apparatus thereof for handover of 2G network, and base station controller - Google Patents

Abstract

The present invention provides a control method, device and base station controller for switching to a 2G network, wherein the method includes: when the base station controller receives the switching access information sent by the terminal before the switching request information sent by the switching control device , cache the handover access information; the base station controller receives the handover request information when the cached time is less than the first preset time threshold, and then performs a subsequent handover process. The present invention makes the success of handover no longer limited to the synchronization ability of the terminal, and improves the success rate of voice service handover in the scene of the same exchange control device.

Description

Control method and device for switching to 2G network, and base station controller

technical field

The invention relates to the field of wireless communication, in particular to a control method, device and base station controller for switching to a 2G network.

Background technique

At present, the 2G/3G core network has realized integrated networking, while the wireless network equipment is still an independent structure. For the problem that the success rate of handover between systems is not high at present, it can be found through analysis that the success rate is mainly limited by the length of handover preparation time. If the handover preparation time between systems can be shortened, it is possible to improve the handover success rate. However, the time for the terminal air interface synchronization process is usually about 600-700ms, and the preparation time for different terminals is different; the time for the core network preparation phase needs to be distinguished whether it is the same switching control device or cross-switching control devices, such as mobile switching center (mobile The switching center (MSC for short) is generally about 100-200ms, and when crossing MSCs, it is generally between 400-2000ms (the following uses the same MSC or cross-MSC scenarios as an example to explain). Therefore, even if the network control unit (including network control units in 3G, LTE, 2G and other networks) sends handover commands and relocation requests (ie Relocation required) to the terminal (ie UE) and the core network MSC respectively at the same time to shorten the handover The preparation time also has great risks in the cross-MSC scenario. That is to say, if the air interface synchronization is completed before the preparation of the core network, the base station controller (i.e. BSC, Base Station Controller) will discard the handover access (i.e. handover access) information sent by the terminal, and wait for the handover request sent by the core network MSC (i.e. The handover request) information arrives before identifying the handover access information, but the terminal will not repeatedly send the handover access information, so it will inevitably cause this handover call drop. After testing, it is found that this risk not only exists in the cross-MSC scenario, but also sometimes occurs under the same MSC, because the terminal synchronization is very fast.

The existing voice service switching control technology has the following deficiencies:

(1) Since the terminal synchronization is very fast, in the scenario of the same exchange control device, it may cause handover and call drop.

(2) Since the terminal synchronization is very fast and the core network preparation time is too long in the cross-exchange control device scenario, it will inevitably cause handover and call drop.

Contents of the invention

The first purpose of the present invention is to propose a control method for switching to a 2G network with a high switching success rate.

The second object of the present invention is to propose a control device for switching to a 2G network with a high switching success rate.

The third object of the present invention is to provide a base station controller with a high handover success rate.

In order to achieve the above-mentioned first object, the present invention provides a control method for switching to a 2G network, including: when the base station controller receives the switching access information sent by the terminal before the switching request information sent by the switch control device, cache switching access information; the base station controller receives the handover request information when the cache time is less than the first preset time threshold, and then performs a subsequent handover process.

In order to achieve the above second purpose, the present invention provides a control device for switching to a 2G network, including: a control module, used to control the base station controller to send the switching request information sent by the terminal before the switching control device in the core network When switching access information, the switching access information is cached until the switching request information is received within the first preset time threshold for subsequent switching procedures; the timing module is used to set the first preset time threshold.

In order to achieve the above third object, the present invention provides a base station controller, including: a timing module, used to set the first preset time threshold; a receiving control module, used to switch before the switching control device sent by the core network When the request information receives the handover access information sent by the terminal, the handover access information is cached until the handover request information is received within the first preset time threshold, and the subsequent handover process is performed.

In each embodiment of the present invention, the base station controller caches the handover access information when it first receives the handover access information until it receives the handover request information within the first preset time threshold to perform subsequent handover procedures, so that the success of the handover is closely related to No is no longer limited to the synchronization capability of the terminal, which improves the success rate of handover in the same MSC scenario.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, together with the embodiments of the present invention, are used to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

FIG. 1 is a flowchart of Embodiment 1 of a control method for switching to a 2G network according to the present invention;

FIG. 2 is a flow chart of Embodiment 2 of the control method for switching to a 2G network according to the present invention;

FIG. 3 is a structural diagram of an embodiment of a control device for switching to a 2G network according to the present invention;

FIG. 4 is a structural diagram of an embodiment of the base station controller of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

method embodiment

FIG. 1 is a flow chart of Embodiment 1 of a control method for switching to a 2G network according to the present invention. As shown in Figure 1, this embodiment includes:

Step S102: The base station controller buffers the handover access information when receiving the handover access information sent by the terminal before the handover request information sent by the switch control device; refer to the explanation of FIG. 2 for the specific operation process;

Step S104: The base station controller receives the handover request information when the cached time is less than the first preset time threshold, and performs a subsequent handover process; refer to the explanation of FIG. 2 for the specific operation process.

In this embodiment, the base station controller buffers the handover access information when it first receives the handover access information until it receives the handover request information within the first preset time threshold to perform subsequent handover procedures, so that the success of the handover is no longer limited Based on the synchronization capability of the terminal, the success rate of switching in the same switching control device scenario is improved.

FIG. 2 is a flow chart of Embodiment 2 of the control method for switching to a 2G network according to the present invention. As shown in Figure 2, this embodiment includes:

Step S202: When receiving the handover request from the terminal, the network control unit communicates with the base station controller, and when receiving the response from the base station controller, simultaneously sends the handover request to the terminal and the switching control device of the core network, such as 3G and The MSC in the 2G network and the Mobility Management Entity (MME) in the LTE send a relocation request; (in the following embodiments, the MSC in the switching control device is used as an example for explanation) wherein, the The network control unit includes network control units in 3G, LTE, 2G and other networks, such as the radio network controller (RNC, Radio Network Controller) in 3G, the BSC in 2G, and the eNodeB in LTE. Various embodiments of the invention are applicable to switching from any network to a 2G network;

For example, the radio network controller directly communicates with the base station controller through the Iur-g interface, wherein the Iur-g interface is a standard interface between the base station controller and the radio network controller, which realizes 2G/ For handover between 3G systems, the wireless network controller can directly send the handover request to the base station controller through the Iur-g interface, and the base station controller directly allocates corresponding wireless resources for it, and the base station controller responds after the allocation is completed; at this time, the wireless network The controller directly sends a handover request to the UE, and at the same time follows the existing protocol process, sends a relocation request to the MSC of the core network, and prepares resources such as the A interface and the Abis interface of the core network;

Step S204: the terminal sends handover access information to the base station controller after receiving the handover command; and the MSC sends handover request information to the base station controller after receiving the relocation request;

Step S206: The base station controller caches the handover access information when it first receives the handover access information, and performs the subsequent handover process when it receives the handover request information within the first preset time threshold, and within the first preset time threshold When the handover request information is not received, the handover access information is discarded, and the handover process is ended;

In specific operation, "performing the subsequent switching process when switching request information is received within the first preset time threshold" in step S206 may include: when the cache time reaches the first preset time threshold, judging whether switching request information is received , and perform a subsequent switching process when receiving the switching request information;

Step S208: After receiving the handover access information and the handover request information, the base station controller first sends handover request confirmation (ie handover request acknowledge) information to the core network MSC, and then sends handover detection (ie handover request acknowledge) after the second preset time threshold. handover detect) information;

The above step S208 mainly considers that under the cross-MSC scenario, the target MSC-B will request user information from the VLR-B. When the request arrives, MSC-B has not sent a MAP pre-handover (Mobile Application Part (MAP)-prepare-handover, MAP-Prep-Handover) response to MSC-A; the network control unit equivalent to the source side has not received a A location command (that is, Relocation Command) message; therefore, according to the existing handover process, the CN on the target side thinks that the UE cannot complete the handover, and therefore needs to perform the operation of step S208. In addition, the first timing threshold is set according to actual needs. For example, assuming that the time of the relocation request lags behind the time of the relocation command by 1400ms, and the average air interface delay is 600ms, the first timing threshold can be set to 1400- 600=800ms; if the relocation request>relocation command shortens the time, the first timing threshold is correspondingly reduced; the second timing threshold can be set to 30-50ms according to the core network processing delay.

In this embodiment, the base station controller caches the handover access information when it first receives the handover access information until it receives the handover request information within the first preset time threshold to perform subsequent handover procedures, and the first preset time threshold Discard the handover access information when the handover request information is not received, and end the handover process, so that the success of the handover is no longer limited to the synchronization capability of the terminal, and the success rate of voice service handover in the same exchange control device scenario is improved; in addition , by successively sending handover request confirmation information and handover detection information, the capabilities of the core network, manufacturer, and terminal are not limited, and the success rate of handover in the cross-switching control device scenario is improved.

Device embodiment

Fig. 3 is a structural diagram of an embodiment of a control device for switching to a 2G network according to the present invention. As shown in FIG. 3, this embodiment includes: a control module 34, which is used to control the base station controller 32 to buffer the handover access information when the handover request information sent by the switching control device in the core network receives the handover access information sent by the terminal. input information, until the switching request information is received within the first preset time threshold, the subsequent switching process is performed; the timing module 36 is used to set the first preset time threshold.

During specific operations, the device may also include a base station controller 32 for receiving the switching request information sent by the switching control device of the core network and the switching access information sent by the terminal, and performing the switching process; the control module 34 may include: receiving control Module 322, configured to control the base station controller 32 to cache the handover access information when receiving the handover access information prior to the handover request information, until the handover request information is received within the first preset time threshold to perform a subsequent handover process; The sending control module 324 is used to control the base station controller 32 to send the handover request confirmation information to the switching control device after receiving the handover access information and the handover request information, and then send the handover detection information after the second preset time threshold, Wherein the second preset time threshold is set by the timing module 36 .

Those skilled in the art can understand that the timing module 36 and the control module 34 can be set jointly or separately. In specific settings, one of the timing module 36 and the control module 34 can also be set in the base station controller 32 according to actual needs.

In this implementation, when the base station controller 32 first receives the handover access information, it buffers the handover access information until it receives the handover request information within the first preset time threshold set by the timing module 34, and then performs a subsequent handover process, so that the handover is successful. Whether or not is no longer limited to the synchronization capability of the terminal, which improves the success rate of voice service handover in the same exchange control device scenario; in addition, the handover request confirmation information and handover detection information are sent successively through the base station controller 32, which is not limited to the core network , manufacturers, and terminal capabilities, which improves the success rate of handover in cross-switching control device scenarios.

FIG. 4 is a structural diagram of an embodiment of the base station controller of the present invention. As shown in Figure 4, this embodiment includes a timing module 42, which is used to set the first preset time threshold; a receiving control module 44, which is used to receive the handover request information sent by the terminal before the switching control device of the core network. When switching the access information, the switching access information is buffered until the switching request information is received within the first preset time threshold to perform a subsequent switching process.

During specific operations, the base station controller may also include: a sending control module 46, configured to send a handover request acknowledgment message to the switching control device after receiving the handover access information and the handover request information, and then send the handover request confirmation information at the second preset time threshold Afterwards, the handover detection information is sent, wherein the second preset time threshold is set by the timing module 42 . The timing module 42 may include a first timer 422 for setting a first preset time threshold and a second timer 424 for setting a second preset time threshold.

Those skilled in the art can understand that the two time thresholds required by the base station controller to receive signals and transmit signals in the handover operations of various embodiments of the present invention can be provided by a timing module 36 or provided by two timers respectively; in addition, the present invention Various embodiments can be used for switching of various services, such as voice services.

In this embodiment, the receiving control module 44 caches the switching access information when it first receives the switching access information until the buffering time is within the first preset time threshold set by the timing module 42. When the switching request information is received, the subsequent switching process is performed, and the improvement is improved. The success rate of voice service handover under the scenario of the same exchange control device; in addition, through the sending control module 46 successively sending handover request confirmation information and handover detection information, it is not limited to the capabilities of the core network, manufacturer, and terminal, and improves cross-exchange control The success rate of switching in the device scenario.

Finally, it should be noted that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still understand The technical solutions recorded in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. A control method for switching to a 2G network, comprising the following steps: The base station controller caches the handover access information when receiving the handover access information sent by the terminal before the handover request information sent by the switching control device; The base station controller receives the handover request information when the cache time is less than the first preset time threshold, and then performs a subsequent handover process; The subsequent switching process includes: After receiving the handover access information and handover request information, the base station controller first sends handover request confirmation information to the switching control device, and then sends handover detection information after a second preset time threshold. 2. The control method for switching to a 2G network according to claim 1, wherein, before the step of receiving the switching access information sent by the terminal before the switching request information sent by the switching control device, the base station controller Also includes: When receiving the response from the base station controller, the network control unit simultaneously sends a switching command to the terminal and a relocation request to the switching control device; After receiving the handover command, the terminal sends the handover access information to the base station controller; After receiving the relocation request, the switch control device sends the handover request information to the base station controller. 3. The control method for switching to 2G network according to claim 2, characterized in that, after the step of said cache switching access information, it also includes: The base station controller discards the handover access information when the handover request information is not received within the first preset time threshold, and ends the handover procedure. 4. The control method for switching to a 2G network according to claim 2, wherein the network control unit comprises: network control units in LTE, 3G and 2G networks; the switching control device comprises 3G and 2G network The mobile switching center in and the mobility management entity in LTE. 5. A control device for switching to a 2G network, characterized in that the device comprises: The control module is configured to control the base station controller to cache the handover access information sent by the terminal when it receives the handover access information sent by the terminal before the handover request information sent by the switching control device in the core network, until the first preset time threshold Performing a subsequent switching process when receiving the switching request information; a timing module, configured to set the first preset time threshold; The subsequent switching process includes: After receiving the handover access information and handover request information, the base station controller first sends handover request confirmation information to the switching control device, and then sends handover detection information after a second preset time threshold. 6. The control device for switching to a 2G network according to claim 5, wherein the control module comprises: A receiving control module, configured to control the base station controller to cache the handover access information when receiving the handover access information prior to the handover request information until the handover access information is received within a first preset time threshold Subsequent switching process is performed when the switching request information is described; A sending control module, configured to control the base station controller to first send handover request confirmation information to the switching control device after receiving the handover access information and handover request information, and then send the handover request confirmation information after a second preset time threshold Handover detection information, wherein the second preset time threshold is set by the timing module. 7. A base station controller, characterized in that, comprising: A timing module, configured to set a first preset time threshold; The receiving control module is configured to cache the switching access information sent by the terminal when the switching request information sent by the switching control device of the core network receives the switching access information until within the first preset time threshold Performing a subsequent switching process when the switching request information is received; The subsequent switching process includes: After receiving the handover access information and handover request information, firstly send handover request acknowledgment information to the switching control device, and then send handover detection information after a second preset time threshold. 8. The base station controller according to claim 7, further comprising: A sending control module, configured to first send handover request confirmation information to the switching control device after receiving the handover access information and handover request information, and then send handover detection information after a second preset time threshold, wherein the The second preset time threshold is set by the timing module. 9. The base station controller according to claim 8, wherein the timing module comprises a first timer for setting the first preset time threshold, and for setting the second preset time threshold Threshold of the second timer.