CN1307846C

CN1307846C - WCDMA to PHS system changing over executing method

Info

Publication number: CN1307846C
Application number: CNB2003101118515A
Authority: CN
Inventors: 孙东迅; 黄胜华
Original assignee: ZTE Corp
Current assignee: Jinjiang High And New Technology Development Office
Priority date: 2003-10-17
Filing date: 2003-10-17
Publication date: 2007-03-28
Anticipated expiration: 2023-10-17
Also published as: CN1529532A

Abstract

A method for executing handover between WCDMA and PHS systems, comprising: after the SRNC completes the handover decision, it determines that a certain user equipment needs to be handed over, and sends a handover request message to the CN; the CN sends the handover request message to the core switching network of the PHS system, and the PHS system The core switching network records and saves the message and returns a response message to the CN; the CN sends a relocation command message to the SRNC; the SRNC sends an "intersystem handover" command to the UE; the UE initiates a link channel establishment request to its base station controller; the PHS The base station controller of the UE sends a "handover request" message to the core switching network; after the CN judges that the handover is completed, the resource originally allocated for the UE is released. The invention can realize the handover flow processing from the WCDMA system to the PHS system, realize the UE with dual-mode capability of WCDMA and PHS, and can smoothly switch from the WCDMA system to the PHS system.

Description

WCDMA switches manner of execution between the PHS system

Technical field

The present invention relates to Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access) system (hereinafter to be referred as WCDMA) and PHS (Personal Handy phone System) inter-system switching method, particularly relate to WCDMA and between the PHS system, switch manner of execution.

Background technology

Extensive use and fast development along with mobile communcations system, a lot of key technologies in the mobile system also are gradually improved, when realizing user's proper communication, also must consider how to obtain best performance, obtain for system and subscriber equipment and can both obtain gratifying preferably effect.

In China, will be widely used very soon as one of the main standard of 3G (Third Generation) Moblie WCDMA, therefore the PHS system situation of WCDMA and PHS two net coexistences will occur in China also ubiquity at present simultaneously.In the case, realize that PHS is the common expectation of operator and communication user institute to the smooth excessiveness of WCDMA, the problem that solves a key of WCDMA and the real coexistence of PHS two nets is the switching between these two systems of realization.In the related protocol standard of 3GPP, stipulate the mutual switching between second-generation systems such as WCDMA system and GSM, but do not had the switching between regulation and PHS system.The same switching of in the relevant criterion of PHS system, also not considering between PHS system and WCDMA system.The user of PHS system if can realize switching between two systems in the zone that the WCDMA system covers, can guarantee PHS user's performance better, also simultaneously can produce more benefit for the operator.

The WCDMA system is relatively short at the development time of various countries, and the PHS system is not the unified standard in the whole world, its commercial countries and regions are less, and are therefore also less relatively for the research of switching between two systems, also do not having data to look into aspect the specific implementation of switching between these two systems at present.

From the handover mechanism of system itself, there are bigger difference in WCDMA system and PHS system.Realize that the switching of WCDMA to PHS is an essential link in the handoff procedure between WCDMA and PHS system, emphasis has been described the processing method that switches to the PHS system in the WCDMA system in this patent.

Summary of the invention

The problem to be solved in the present invention is the switching manner of execution that does not have in the prior art at WCDMA system and PHS system, and processing method is carried out in the switching that has proposed a kind of head it off, can realize effectively from the switching between WCDMA system to PHS system.

Technical scheme of the present invention comprises the steps:

1.1 SRNC (Serving Radio Network Controller, service wireless network controller) after finishing the judgement switching, determine certain subscriber equipment to switch to the PHS system, send to CN (Core Network, core net) and require to switch message from the WCDMA system;

1.2 CN sends the message that requires to switch to PHS to the core switching network of PHS system, the core switching network record of PHS system is also preserved this message;

1.3 the core switching network of PHS system returns response message to CN;

1.4 CN sends the reorientation command messages to SRNC;

1.5 SRNC sends " switching between system " order to UE (User Equipment, subscriber equipment);

1.6 UE initiates link channel to the base station controller of PHS and sets up request;

1.7 the base station controller of PHS sends " handoff request " message to the core switching network;

1.8 judging after switching is finished, CN discharges the resource of distributing for this UE originally.

SRNC in the such scheme comprises: type of message, reorientation type, reason, source ID and Target id to the message that CN sends.

In the such scheme, can replace step 1.3 and 1.4 in another way, promptly at SRNC when CN send to require switches message, a timer is set, in the time that timer is set, UE does not receive the handoff failure order, and then SRNC sends " switching between system " order to UE.

Method logic of the present invention is reasonable, efficient is higher, can realize that the WCDMA system handles to the switching flow of PHS system, and the UE that realization has WCDMA and PHS dual-mode capabilities can successfully switch to the PHS system from the WCDMA system.

Description of drawings

Fig. 1 is that the flow chart that embodiment carries out is switched in WCDMA system to PHS system;

Fig. 2 is the message interaction process figure of an embodiment carrying out of the switching of WCDMA system to PHS system.

Embodiment

Can implement the UE that the WCDMA system switches to the PHS system among the present invention must be bimodulus or the multimode terminal that can support WCDMA system and PHS system.

Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:

The method of the invention flow process as shown in Figure 1, as can be seen from Figure 1:

(1) message of switching to CN transmission requirement the back (as " re-positioning request " message) (i.e. 101 steps) is switched in the SRNC judgement.The transmission of this message be SRNC thinking be necessary UE switched to the PHS system after, carry out the first step of message flow.Triggering this judgement has multiple situation, as: A, measure the second-rate of current carrier frequency according to UE; B, user and operator are signatory preferentially in the PHS network; The quality of C, PHS system cell is better really; D, artificial requirement.The SRNC judgement is switched the back and is comprised following content to the message that the CN transmission requires to switch:

" type of message ": the message that is used to identify transmission;

" reorientation type ", its value is " relating to the SRNS reorientation (UE involved in relocation ofSRNS) of UE ";

" reason ": be used to show the reason that reorientation takes place;

" source ID ": the sign that is used for identifying the SRNC of WCDMA system before switching;

" Target id ": be used for identifying the affiliated base station controller of PHS system Target cell;

Some other condition cell carries the PHS system and finishes needed other parameters of switching.

(2) CN switches message (as " re-positioning request " message) afterwards in parsing by the requirement that SRNC sends, information according to the PHS system that is kept in the database, to the core switching network of the correspondence of PHS system, send and require to switch to PHS system message (as " switch and prepare " message).In message can with on the ongoing service related information of current UE, the sign of UE, the sign of SRNC etc.The core switching network of PHS with information wherein, is preserved after receiving message.The purpose that (promptly 102 step) preserved is to judge that whether " handoff request " message of offering from the base station controller of PHS be the switching from the WCDMA system in subsequent step.

(3) the core switching network of PHS sends response message (as " switch and prepare response " message) (i.e. 103 steps) to CN, after CN receives message, sends the order (as " reorientation order " message) (i.e. 104 steps) that can switch to SRNC.Design according to system also can be adopted other scheme, as at SRNC after CN sends " re-positioning request " message, a timer is set, if within this time, UE does not return the handoff failure order in the WCDMA system, then think and successfully cut the system to PHS.

(4) SRNC sends " switching between system " order (i.e. 105 steps) to UE, requires UE to carry out change action, may have the information such as frequency of PHS respective cell in the message.After UE received, promptly according to relevant information, beginning was got in touch with the respective cell of PHS system, and initiated link channel to UE to its base station controller and set up request (i.e. 106 steps).If in " switching between system " order, do not have the definite target cell information, then UE need initiatively seek suitable PHS sub-district.

(5) in the PHS system base station controller receive UE " after link channel set up request information, under situation about can admit, then the core switching network to PHS sent message (as " handoff request " message), and expression has the user to cut (promptly 107 going on foot).

(6) the core switching network of PHS to CN send message (as " and finish the signaling request information), show that the switching between system is finished substantially, CN judges to switch and finishes the back and discharge the resource (promptly 108 going on foot) of distributing for this UE originally.If do not send this message to CN, also can a timer be set by the CN end, after overtime, discharge the resource that former WCDMA side is distributed for this UE automatically.

Fig. 2 is that the embodiment that carries out is switched in WCDMA system to PHS system, for convenience Fig. 2 is done a complete explanation, and the several symbol descriptions shown in the figure are as follows:

PHS-IGW: be meant the core switching network in the PHS system.

PHS-CSC: the base station controller that is meant Target cell in the PHS system.

The message interaction process example that shown in Figure 2 is in the hand-off execution process specifies as follows:

(1) the SRNC judgement is switched the back to CN transmission " re-positioning request " message (i.e. 201 steps).

(2) CN " switches and prepares " message (i.e. 202 steps) to the core switching network transmission of PHS system after parsing.

(3) the core switching network of PHS sends " switch and prepare response " (i.e. 203 steps) to CN after preserving this message content.

(4) CN if not failure information, then sends " reorientation order " (i.e. 204 steps) to SRNC at once after " switch and prepare response " message that the core switching network of receiving the PHS system is sent; If failure, then flow process is ended.

(5) SRNC sends " switching between system " order (i.e. 205 steps) to UE.

(6) UE carries out synchronously etc. after the process with the base station in the PHS system, and corresponding base station controller sends " link channel is set up request " in the PHS system.(i.e. 206 steps)

(7) base station controller is under situation about can admit in the PHS system, and then the core switching network to PHS sends " handoff request " message (i.e. 207 steps).

(8) the core switching network of the PHS content that will be somebody's turn to do " handoff request " message compares with previous information of preserving, know that it is the switching from the WCDMA system, after can proper communication, send the message of " end signaling " to CN, show that switching finishes substantially.(i.e. 208 steps)

(9) CN is after receiving " end signaling " message, discharge all relevant resources, therefore need to the UE transmission of the SRNC in the WCDMA system originally " Iu release " message (i.e. 209 steps), SRNC will discharge all wireless and ground resources of original distribution immediately after receiving.

What need specified otherwise is, message shown in 203 steps, 204 steps, 208 steps, 209 steps all is optional message in the drawings, design conditions according to system, can use flexibly fully, even can not adopt, for example at SRNC after CN sends " re-positioning request " message, a timer is set, if within this time, UE does not return the handoff failure order in the WCDMA system, think that then successful switch can save (203) step, (204) step, (209) step like this to the PHS system.If CN sends " switch and prepare " message at the core switching network to the PHS system after, a timer is set, if in the time that timer is set, do not receive " reorientation cancellation " message that SRNC sends, think that then it is successful switching to the PHS system, discharge the information relevant of preserving among the CN simultaneously, can save the step of 208 among Fig. 2 like this with this UE.

Claims

1. A WCDMA handover execution method between PHS systems, comprising the steps of:

1.1 After the serving radio network controller completes the judgment handover, it decides that a user equipment is handed over from the WCDMA system to the PHS system, and sends a handover request message to the core network (101);

1.2 The core network sends a message requesting to switch to PHS to the core switching network of the PHS system, and the core switching network of the PHS system records and saves the message (102);

1.3 The core switching network of the PHS system returns a response message (103) to the core network;

1.4 The core network sends a relocation command message to the serving radio network controller (104);

1.5 The serving radio network controller sends an "inter-system handover" command to the user equipment (105);

1.6 The user equipment initiates a link channel establishment request to the base station controller of the PHS (106);

1.7 The base station controller of the PHS sends a "handover request" message (107) to the core switching network;

1.8 After the core network judges that the handover is completed, the resources originally allocated for the user equipment are released (108).

2. The WCDMA-to-PHS inter-system handover execution method according to claim 1, characterized in that: the message sent by the serving radio network controller to the core network includes: message type, relocation type, reason, source ID and target ID.

3. A WCDMA to handover execution method between PHS systems, comprising the steps of:

3.1 After the serving radio network controller completes the judgment handover, it decides that a user equipment is handed over from the WCDMA system to the PHS system, sends a handover request message to the core network, and sets a timer (101);

3.2 The core network sends a message requesting to switch to PHS to the core switching network of the PHS system, and the core switching network of the PHS system records and saves the message (102);

3.3 Within the time set by the timer in step 3.1, if the user equipment does not receive a handover failure command, the serving radio network controller sends an "inter-system handover" command to the user equipment (105);

3.4 The user equipment initiates a link channel establishment request to the base station controller of the PHS (106);

3.5 The base station controller of the PHS sends a "handover request" message to the core switching network (107);

3.6 After the core network judges that the handover is completed, the resources originally allocated for the user equipment are released (108).