CN102111836A - 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, particularly (The ThirdGeneration, 3G) system is to second generation mobile communication (The Second Generation, 2G) different system directed retry (DRD) technology of system for 3G (Third Generation) Moblie.

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.Though 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, because the mutual maneuverability of height of 3G system and 2G system, the 2G system will create repayment in the market part of valuing 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 that subscriber equipment (UE) is switched to the 2G system from the 3G system, so that provide continuous network service for UE.

Fig. 1 is traditional different system DRD process schematic diagram.As shown in Figure 1, this process may further comprise the 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, reply the professional response message (RAB ASSIGNMENTRESPONSE) of assigning to core net, this business is assigned and is carried in response message that to be used to indicate failure cause be the information of " different system DRD ".

This step is assigned failure by professional its business of response message notice core net of assigning, and informs the reason of concrete failure.

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

Here, go out request message by send 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, reply different system to core net and switch and be ready to complete (HANDOVERREQUEST ACKNOWLEDGE) message for the UE Resources allocation and in the described back that assigned.

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

By above-mentioned steps 103-106, under the triggering of RNC, target BS C finished to different system switch into preparation, i.e. the configuration of respective resources, in this process, transmitting by core net alternately between RNC and the 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 according to described different system and order and target BS C carries out synchronously, and are sending synchronous success message (HANDOVER ACCESS) in success back synchronously to target BS C.

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 finish (HANDOVERCOMPLETE) message.

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

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

Release command discharges the local resource of described UE according to described IU mouth for step 113, RNC, discharges in described resource and finishes the back and reply the release of IU mouth to core net and finish (IU RELEASECOMPLETE) message.

From said process as can be seen, in traditional different system DRD process, when RNC judge UE need be switched to the 2G system from the 3G system after, need trigger target BS C by core net is the configuration that UE carries out resource, and after UE and target BS C success synchronously, the user face data of UE is moved to the 2G system side by core net, therefore will comprise in the above-mentioned DRD process between core net and RNC or the 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 this 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, this method may further comprise the steps:

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

Described target BS C is described UE Resources allocation according to the resource allocation request message of described enhancing, finishes the described resource allocation response message that distributes the back to send enhancing to described RNC by described IUR-G interface;

Described RNC is according to the resource allocation 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 replys synchronous success message to described BSC when successful synchronously described;

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

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

In sum, the different system directed retry method that the present invention proposes, realize mutual between RNC and the BSC by utilizing the IUR-G interface, and the user face data of UE is transferred to the 2G system side by RNC, make that 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 invention one;

Fig. 3 moves towards schematic diagram for the data before and after the different system DRD of the present invention.

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 handover success rate to a certain extent, having increased a kind of new interface is the IUR-G interface, this interface promptly 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 the 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 invention one, and as shown in Figure 1, the embodiment of the invention one may further comprise the steps:

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

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.

Described judgement need be grasped by those skilled in the art for the concrete grammar that UE triggers different system DRD process, does not repeat them here.

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

In this step, RNC directly sends the resource allocation request message that strengthens to target BS C 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, finish described resource allocation response (ENHANCED RELOCATION RESOURCE RESPONSE) message of distributing the back to send enhancing to described RNC by the IUR-G interface.

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 allocation 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 to switch to gsm system.

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

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

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

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

By the foregoing description one, the present invention is by the Iur-g interface between RNC and the BSC as can be seen, make that different system DRD process is transparent for core net, thereby can reduce the interaction time delay of RNC or BSC and core net, improve the time delay index of different system DRD.

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

In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (1)

1. different system directed retry (DRD) method is characterized in that this method may further comprise the steps:

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

Described target BS C is described UE Resources allocation according to the resource allocation request message of described enhancing, finishes the described resource allocation response message that distributes the back to send enhancing to described RNC by described IUR-G interface;

Described RNC is according to the resource allocation 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 replys synchronous success message to described BSC when successful synchronously described;

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

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

Images