CN100441049C - Method for improving 3G to 2G switching success ratio - Google Patents

Abstract

This invention discloses a method for enhancing the successive rate of switching 3G to 2G including: a, a system compares the signal quality of current frequency with the preset triggered switch prepared threshold value, b, if the signal quality of the current frequency is lower than the prepared threshold value, a RNC triggers the switch preparation in advance to reconfigure the service can't be switched to 2G directly to that switched to 2G directly.

Description

A kind of method that improves 3G to the 2G handover success rate

Technical field

The present invention relates to the mobile communication technology field, specifically, relate to the technology that UE (User Equipment user terminal) switches to the 2G network from 3G network.

Background technology

At the laying initial stage of 3G network, exist from the time of 2G network to the 3G network transition, therefore need the 2G network as a supplement, make that the coverage of whole network is wider, power system capacity is higher.

As shown in Figure 1, when 2G network and 3G network exist simultaneously, when UE (User Equipment user terminal) moves to the 2G zone from the 3G overlay area, need between 2G and 3G network, switch, in order to guarantee professional continuity, need to introduce the mechanism that 3G/2G switches.3G switches key control parameter to the 2G system and comprises the parameter that triggers the 3A incident.The 3A incident is a kind of in the isosystem measurement of event mode, RNC is handed down to UE with the standard that reports of 3A incident, and UE reports standard to measure according to this, after satisfying condition, report the 3A event report to RNC, referring to 3GPP TS 25.331 technical specification group wireless access networks; Radio Resource control (RRC); Protocol specification (Technical SpecificationGroup Radio Access Network; Radio Resource Control (RRC); Protocolspecification).

(1) has represented the process of switching to 2G from 3G among Fig. 1, and on behalf of UE, (2) move in 2G, and (3) have represented the process of switching to 3G from 2G.

The user exists current business 3G to support and the unsupported situation of 2G in moving process probably, if force this moment to switch to 2G from 3G, then switching can failure.At this problem following several solution is arranged at present:

1, RNC (Radio Network Controller radio network controller) judgement need be after 2G switches, initiate migration request to CN (Core Network core net), CN then initiates handover preparation request to MSC (Mobileservices Switching Center moves and serves switching center).After MSC received that BSC (Basic Station Controller base station controller) returns handoff request and replys, notice CN was ready to complete; CN is after receiving that response message is prepared in switching, and notice RNC initiates 3G and switches to 2G; Behind the handover success, CN release links with RNC's.

Wherein, when CN assigns RAB (Radio Access Bearer RAB), inform whether RNC should business can switch to 2G, if CN does not assign, then RNC determines according to the configuration information of this locality whether this business can be switched to 2G.

Though this scheme has been avoided the failure of switching, but since CN inform RNC can not to the 2G network switch or RNC determine according to the configuration information of this locality can not be when the 2G network switches, then do not carry out 3G and switch, probably cause call drop because UE has left the 3G overlay area to 2G.

When 2, CN assigns RAB professional,, also assigned the information of optional business except assigning this professional information.When needs take place 3G to the switching of 2G, optional business support 3G is to the switching of 2G if current business is not supported, then earlier with professional reprovision to optional business, RNC sends professional reconfiguration request to core net, after core net received request, the issuing service reconfiguration message was after RNC receives message, the current business reprovision is changed to the business that can carry out the 3G/2G switching, carries out the switching of 3G/2G again.

As current business is VP (Video Phone video telephone) business, the 2G network is not supported, then at first mutual by RNC and CN, revise current business, change the VP business AMR (the Adaptive Multi-Rate adaptive multi-rate) speech business of 2G network support into, and then switch to the 2G network from 3G network.

Though this scheme has been avoided the failure of switching, and also can carry out the switching of 3G to 2G, because the overlong time of the professional consumption of reprovision, so the also not just still very possible generation of call drop of reprovision success of business.

Summary of the invention

The object of the present invention is to provide the method for a kind of 3G of raising to the 2G handover success rate.

For achieving the above object, the present invention adopts following technical scheme:

A kind of method that improves 3G to the 2G handover success rate, described method comprises the steps:

A, system compare the signal quality of current frequency and pre-configured triggering switching preparation threshold value;

If the signal quality of the described current frequency of b is lower than described pre-configured triggering switching preparation threshold value, radio network controller (RNC) triggers in advance to switch and prepares, and the current professional reprovision that can not directly switch to 2G is changed to can be to the business of 2G switching.

Described method also comprises:

To the business configuration of can not be directly switching to 2G be higher than can be directly to the described triggering switching preparation threshold value of 2G service switchover.

Wherein step a specifically comprises:

A1, described system judge whether the signal quality of described current frequency is lower than pre-configured isosystem measurement enabling gate limit value;

Wherein step b specifically comprises:

If the described isosystem measurement enabling gate of b1 limit value is higher than the signal quality of described current frequency, RNC enters in advance to switch and prepares, and the described current professional reprovision that can not directly switch to 2G is changed to can be to the business of 2G switching.

Wherein also comprise before the step a1:

A0, to the business configuration of can not be directly switching to 2G be higher than can be directly to the described isosystem measurement enabling gate limit value of 2G service switchover.

Wherein step a0 also comprises:

To the described business that can not directly switch to 2G, configuration is lower than the described directly signal quality threshold value of frequency of utilization in the 3A of 2G service switchover incident.

Wherein step a0 also comprises:

To the described business of can not be directly switching to 2G, configuration is higher than described triggered time and the evaluation time of can be directly reporting to the 3A of 2G service switchover Event triggered time and cycle.

The present invention overcomes the deficiencies in the prior art, the threshold value that employing can not directly be prepared to the triggering switching of 2G service switchover is heightened so that RNC switches preparation in advance, thereby prolong professional technical scheme of reshuffling the time, making UE that adequate time be arranged is can be to the business of 2G switching with professional reprovision, thereby improved the success rate of 3G to 2G, solved in the prior art when taking place 3G to the switching of 2G, optional business support 3G is to the switching of 2G if current business is not supported, RNC is changed to the long business that causes of optional business hours with the current business reprovision and does not also reshuffle success with regard to the problem of call drop.

Description of drawings

The schematic diagram that Fig. 1 switches between 3G and 2G network for UE;

Fig. 2 is the flow chart that the described 3G of the embodiment of the invention switches to 2G.

Embodiment

Basic principle of the present invention is for the business that can not directly switch to 2G, the threshold value of preparing is switched in the triggering that its configuration is higher, make RNC initiation 3G more early switch set-up procedure to 2G, when taking place 3G to the switching of 2G, optional business support 3G is to the switching of 2G if current business is not supported, current business reshuffled to time of optional business to be increased, avoid professional also not the reprovision success with regard to the situation of call drop.

Be elaborated below in conjunction with the drawings and specific embodiments.

Usually, dispose isosystem measurement and start/stop thresholding in RNC, the isosystem measurement that the signal quality of current frequency is lower than the current business of configuration starts thresholding, and then RNC issues isosystem measurement control, prepares to initiate the switching of 3G to 2G.When signal quality is higher than the current thresholding that stops, then RNC discharges isosystem measurement control, stops the switching set-up procedure of 3G to 2G.

The present invention starts thresholding according to the business configuration isosystem measurement, for the business that can not directly switch to 2G, can the configuration of enabling gate limit value is higher, the then measurement of the different system of the easier initiation of RNC, initiate the set-up procedure of 3G in advance to the switching of 2G, after starting isosystem measurement, RNC need to judge whether reconfiguration traffic, if desired, RNC and CN are mutual, revise current business, with the current business reprovision to optional business, because business is reshuffled shifting to an earlier date of time, the time that business is reshuffled will increase, and avoid professional situation generation of also not reshuffling success with regard to call drop.

For example, startup thresholding for the AMR speech business isosystem measurement that can switch is configured to-95dBm, start thresholding for the professional isosystem measurement of VP that can not be directly switches to the 2G network and be configured to-85dBm, then when having only the AMR voice, when-95dBm, start isosystem measurement; For the VP business, then RNC has just started isosystem measurement when-85dBm.

As mentioned above and since to the business configuration can not be directly switched to 2G higher isosystem measurement start thresholding, if but the configuration of the thresholding of isosystem measurement is too high, signal quality may take place cause cutting situation to 2G better but because of short duration fluctuation is arranged by mistake.Because after finishing isosystem measurement, a condition of 3A reporting events is the signal quality threshold value that the signal quality of the frequency used when conversing of current UE is lower than pre-configured frequency of utilization, generation for fear of above-mentioned mistake switching, the signal quality threshold value of frequency of utilization can be turned down, the condition of 3A reporting events will satisfy than difficult, and the situation that above-mentioned mistake is switched just can not take place easily.Therefore, technical solution of the present invention, is turned down the signal quality threshold value of frequency of utilization for the business that can not directly switch to 2G according to the signal quality threshold value of business configuration frequency of utilization.

In addition, switch in order to prevent the mistake that the radio signal quality shake causes, can dispose the sluggish of bigger 3A incident/different system cycle report and triggered time of long 3A incident, guarantee that UE is in the poor signal quality quite a long time and just can initiates 3G and switch to 2G.

For example, the triggered time of AMR speech business is configured to 640ms, the professional triggered time of VP is configured to 1000ms, then when having only the AMR voice, when signal quality condition satisfies and keep 640ms, could initiate 3G/2G and switch,, then need keep 1000ms could initiate 3G/2G and switch for the VP business.

In addition, in the time, in all cycle reports that report, the signal quality of certain sub-district is all relatively good, then thinks to switch to this sub-district in the cycle report triggering.Therefore, switch in order to prevent the mistake that the radio signal quality shake causes, can also be at long report evaluation time in cycle and the triggered time of business configuration that can not directly switch to 2G.

Concrete flow process is as shown in Figure 2:

1, starts thresholding for the higher isosystem measurement of business configuration that can not be directly switches, the triggered time sluggish and long 3A incident of the signal quality threshold value of frequency of utilization and bigger 3A incident/different system cycle report and the triggered time and the report evaluation time of cycle report in the lower 3A incident of configuration simultaneously to 2G;

2, system judges whether the signal quality of current frequency is lower than the isosystem measurement startup thresholding of the current business of configuration, if change step 3, otherwise change step 6;

3, system judges that time that whether signal quality of current frequency is lower than the signal quality threshold value of 3A incident frequency of utilization of current business of configuration and maintenance surpasses the triggered time of configuration, if change step 4, otherwise change step 6;

4, system judges according to the cycle report whether the signal quality of different system is higher than the target gate of current business and the time of maintenance surpasses the triggered time, if, change step 5, otherwise, step 6 changeed;

5, initiate to switch;

6, finish.

Above embodiment only is used for illustrating and unrestricted technical scheme of the present invention; those of ordinary skill in the art makes amendment to the present invention or is equal to replacement; the any modification or the replacement that do not break away from spirit of the present invention and essence all should be encompassed in the middle of the claim protection range of the present invention.

Claims (5)

1, a kind of method that improves 3G to the 2G handover success rate is characterized in that, to the business configuration of can not be directly switching to 2G be higher than can be directly to the triggering switching preparation threshold value of 2G service switchover;

Described method comprises the steps:

A, system compare the signal quality and the described pre-configured triggering switching preparation threshold value of current frequency;

If the signal quality of the described current frequency of b is lower than described pre-configured triggering switching preparation threshold value, radio network controller (RNC) triggers in advance to switch and prepares, and the current professional reprovision that can not directly switch to 2G is changed to can be to the business of 2G switching.

2, method according to claim 1 is characterized in that, wherein step a specifically comprises:

A1, described system judge whether the signal quality of described current frequency is lower than pre-configured isosystem measurement enabling gate limit value;

Wherein step b specifically comprises:

If the described isosystem measurement enabling gate of b1 limit value is higher than the signal quality of described current frequency, RNC enters in advance to switch and prepares, and the described current professional reprovision that can not directly switch to 2G is changed to can be to the business of 2G switching.

3, method according to claim 2 is characterized in that, wherein also comprises before the step a1:

A0, to the business configuration of can not be directly switching to 2G be higher than can be directly to the described isosystem measurement enabling gate limit value of 2G service switchover.

4, method according to claim 3 is characterized in that, wherein step a0 also comprises:

To the described business that can not directly switch to 2G, configuration is lower than the described directly signal quality threshold value of frequency of utilization in the 3A of 2G service switchover incident.

5, method according to claim 3 is characterized in that, wherein step a0 also comprises:

To the described business of can not be directly switching to 2G, configuration is higher than described triggered time and the evaluation time of can be directly reporting to the 3A of 2G service switchover Event triggered time and cycle.

Images