CN102111836B - DRD method - Google Patents

Abstract

The invention discloses a DRD (Directed Retry in Different-system) method, which comprises the following steps: an interaction between an RNC (Radio Network Controller) and a BSC (Base Station Controller) is realized via an IUR-G interface, user plane data of UE (User Equipment) is transferred to the 2G (Second Generation) side via the RNC to enable that the whole DRD process is transparent to a core network, so that the processing time delay for the core network can be omitted. Therefore, the processing time delay in the DRD process can be effectively reduced via adopting the method provided by the invention.

Description

A kind of different system directed retry method

Technical field

The present invention relates to moving communicating field, be particularly related to 3G (Third Generation) Moblie (The ThirdGeneration, 3G) system is to different system directed retry (DRD) technology of Generation Mobile Telecommunication System (The Second Generation, 2G) system.

Background technology

Along with the fast development of mobile communication technology, the 3G system that voice communication and multimedia communication can be combined has obtained applying in the world.Although in the long run, the 3G system replaces the 2G system and is inevitable, and the 2G system still has long life cycle.The 2G network is through long-term construction and optimization on the one hand, and it covers quite complete and perfect performance.On the other hand, due to the mutual maneuverability of height of 3G system and 2G system, the 2G system will create repayment in the market part that value voice for a long time.

At present, in order to utilize the generally covering of existing 2G network, when the 3G resource lacks, system will utilize different system directed retry process with subscriber equipment (UE) from the 3G system switches to the 2G system, in order to provide continuous network service for UE.

Fig. 1 is traditional different system DRD process schematic diagram.As shown in Figure 1, this process comprises the following steps:

Step 101, core net are that subscriber equipment (UE) is to radio network controller (RNC) issuing service assignment request (RAB ASSIGNMENT REQUEST) message.

Here, the entity of core-network side is mobile switching centre (MSC).

After step 102, RNC receive described issuing service assignment request message, judging needs to initiate different system DRD process, assign response message (RAB ASSIGNMENTRESPONSE) to core net reply business, this business is assigned and is carried the information that failure cause is " different system DRD " that is used to indicate in response message.

This step assigns its business of response message notice core net to assign unsuccessfully by business, and informs concrete failed reason.

Step 103, RNC send different system migration to core net and go out request (RELOCATIONREQUIRED) message.

Here, go out request message by sending different system migration to core net, making core net trigger target BS C is the UE Resources allocation.

Step 104, core net go out request message according to described different system migration, send different system to target BS C and switch into request (HANDOVER REQUEST) message.

Step 105, target BS C switch into request message according to different system, for the UE Resources allocation and reply different system to core net switch and be ready to complete (HANDOVERREQUEST ACKNOWLEDGE) message after described having assigned.

Step 106, core net are replied different system migration order (RELOCATIONCOMMAND) to RNC, wherein, carry space interface signaling in different system migration order.

By above-mentioned steps 103-106, under the triggering of RNC, target BS C completed to different system switch into preparation, i.e. the configuration of respective resources, in this process, transmitting by core net alternately between RNC and target BS C.

Step 107, RNC send different system to described UE to be switched and order (HANDOVER FROMUTRAN COMMAND), indicates described UE to switch to the 2G system side.

Step 108, described UE are switched order and synchronize with target BS C according to described different system, and send synchronous success message (HANDOVER ACCESS) to target BS C after synchronous success.

Step 109, target BS C reply change detection success (HANDOVER DETECT) message according to the synchronous success message that receives to core net, and core net is adjourned the 2G system side according to described change detection success message with the user face data of described UE.

Step 110, described UE reply to switch to target BS C and complete (HANDOVERCOMPLETE) message.

Step 111, target BS C reply different system to core net and switch into completing (HANDOVERCOMPLETE) message.

Step 112, core net issue IU mouth release command (IU RELEASECOMMAND) to RNC.

Step 113, RNC discharge the local resource of described UE according to described IU mouth release command, reply the release of IU mouth to core net and complete (IU RELEASECOMPLETE) message after described resource release is completed.

Can find out from said process, in traditional different system DRD process, when RNC judge UE need to be switched to the 2G system from the 3G system after, need to trigger target BS C by core net is the configuration that UE carries out resource, and after successfully synchronizeing, UE and target BS C by core net, the user face data of UE is moved to the 2G system side, therefore will comprise in above-mentioned DRD process between core net and RNC or BSC alternately, this will make above-mentioned traditional different system DRD process have the larger process time delay.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of different system directed retry method, and the method can effectively reduce the processing delay of different system DRD process.

In order to achieve the above object, the technical scheme of the present invention's proposition is:

A kind of different system directed retry (DRD) method, the method comprises the following steps:

Judge after radio network controller (RNC) is receiving the business assignment request message that core net issues and send the resource allocation request message that strengthens to target base station controller (BSC) by the IUR-G interface in the time of to trigger different system DRD process as subscriber equipment (UE);

Described target BS C is described UE Resources allocation according to the resource allocation request message of described enhancing, completes described distribution afterwards by the resource assignment response message of described IUR-G interface to described RNC transmission enhancing;

Described RNC is according to the resource assignment response message of the described enhancing that receives, and sends different system to described UE and switches and order;

Described UE switches order and carry out synchronously according to the described different system that receives, and described synchronous when successful to the synchronous success message of described BSC reply;

Described BSC replys the change detection success message that strengthens to described RNC by described IUR-G interface, described RNC transfers to the 2G system side according to the change detection success message of described enhancing with the user face data of described UE;

Described UE replys handoff completion message to described BSC;

Described BSC replys to described RNC the different system that strengthens by described IUR-G interface and switches into completing message according to described handoff completion message;

Described RNC switches into completing message according to the different system of described enhancing, replys successful business to core net and assigns response message.

In sum, the different system directed retry method that the present invention proposes, by utilizing mutual between IUR-G Interface realization RNC and BSC, and by RNC, the user face data of UE is transferred to the 2G system side, making whole different system DRD process is transparent for core net, thereby can save the processing delay of core net, therefore, can effectively reduce the processing delay of different system DRD process.

Description of drawings

Fig. 1 is the flow chart of traditional different system DRD process;

Fig. 2 is the flow chart of the embodiment of the present invention one;

Fig. 3 is that the data before and after the different system DRD of the present invention are moved towards schematic diagram.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.

In present TD-SCDMA systems technology standard, in order to reduce different system handover delay, and improve to a certain extent handover success rate, having increased a kind of new interface is the IUR-G interface, this interface namely can carrier signaling face data, also can carry user face data.

Based on this, core concept of the present invention is: utilize the IUR-G interface between RNC and BSC, existing different system DRD process is improved, make different system DRD process of the present invention transparent to core net, to reduce the interaction time delay of RNC or BSC and core net, improve the time delay index of different system DRD, promote user's impression.

Fig. 2 is the flow chart of the embodiment of the present invention one, and as shown in Figure 1, the embodiment of the present invention one comprises the following steps:

Step 201～202, judge after RNC is receiving business assignment request (RABASSIGNMENT REQUEST) message that core net issues in the time of to trigger different system DRD process as UE, send the resource allocation request message (ENHANCEDRELOCATION RESOURCE REQUEST) that strengthens by the IUR-G interface to target BS C.

Here, carry the information such as Speech version that business information, UE are supported in the resource allocation request message of described enhancing, specifying information is the same with the definition in existing CCSA (CCSA) standard, does not repeat them here.

Describedly judge and to be grasped by those skilled in the art as the concrete grammar that UE triggers different system DRD process, do not repeat them here.

It is the UE Resources allocation that the resource allocation request message of described enhancing be used for to trigger target BS C, with complete different system switch into preparation.

In this step, RNC directly sends to target BS C the resource allocation request message that strengthens by the IUR-G interface, and does not need the forwarding through core-network side, therefore, will obviously reduce the processing delay of different system DRD process.

Step 203, described target BS C are described UE Resources allocation according to the resource allocation request message of described enhancing, complete described distribution afterwards by resource assignment response (the ENHANCED RELOCATION RESOURCE RESPONSE) message of IUR-G interface to described RNC transmission enhancing.

In this step, the distribution of described resource comprises user's face resource and signaling plane resource.

Step 204, described RNC be according to the resource assignment response message of the described enhancing that receives, and sends different system to described UE and switch and order (HANDOVER FROM UTRANCOMMAND).

In this step, described different system switches order and be used to indicate UE and switch to gsm system.

Step 205, described UE are switched order and carry out synchronously according to the described different system that receives, and synchronously reply synchronously successfully (HANDOVER ACCESS) message to described BSC when successful described.

Step 206, described BSC reply change detection success (the ENHANCEDRELOCATION RESOURCE DETECT) message that strengthens to described RNC, described RNC transfers to the 2G system side according to the change detection success message of described enhancing with the user face data of described UE.

In this step, according to the change detection success message that strengthens, the user face data of described UE is transferred to the 2G system side by RNC.The concrete grammar of the user face data of described UE being transferred to the 2G system side is known for those skilled in the art, does not repeat them here.

Step 207, described UE reply to switch to described BSC and complete (HANDOVERCOMPLETE) message.

Step 208, described target BS C switch into completing (ENHANCED RELOCATIONRESOURCE COMPLETE) message to replying to described RNC the different system that strengthens by the IUR-G interface according to described handoff completion message.

Here, after described target BS C receives described handoff completion message, switch into completing message to the different system that RNC replys enhancing directly sending out by the IUR-G interface, completed the process that migrates into of different system with notice RNC.

Step 209, described RNC switch into completing message according to the different system of described enhancing, reply successful business to core net and assign response (RAB ASSIGNMENT RESPONSE) message.

By above-described embodiment one, can find out that the present invention is by the Iur-g interface between RNC and BSC, making different system DRD process is transparent for core net, thereby can reduce the interaction time delay of RNC or BSC and core net, improves the time delay index of different system DRD.

After above-mentioned steps is carried out, will be by all data (shown in Figure 3) between the IUR-G interface described UE of transmission and core net between RNC and BSC.

In sum, these are only preferred embodiment of the present invention, is not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (1)

1. a different system directed retry method, is characterized in that, the method comprises the following steps:

Judge after radio network controller (RNC) is receiving the business assignment request message that core net issues in the time of to trigger the different directed retry DRD of system process as user equipment (UE), send the resource allocation request message that strengthens by the IUR-G interface to target base station controller BSC;

Described target BS C is described UE Resources allocation according to the resource allocation request message of described enhancing, completes described distribution afterwards by the resource assignment response message of described IUR-G interface to described RNC transmission enhancing;

Described RNC is according to the resource assignment response message of the described enhancing that receives, and sends different system to described UE and switches and order;

Described UE switches order and carry out synchronously according to the described different system that receives, and described synchronous when successful to the synchronous success message of described BSC reply;

Described BSC replys the change detection success message that strengthens to described RNC by described IUR-G interface, described RNC transfers to the 2G system side according to the change detection success message of described enhancing with the user face data of described UE;

Described UE replys handoff completion message to described BSC;

Described BSC replys to described RNC the different system that strengthens by described IUR-G interface and switches into completing message according to described handoff completion message;

Described RNC switches into completing message according to the different system of described enhancing, replys successful business to core net and assigns response message.

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