CN100512499C - Method for preventing ping-pong switch and device with ping-pong switch filtering function - Google Patents
Method for preventing ping-pong switch and device with ping-pong switch filtering function Download PDFInfo
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- CN100512499C CN100512499C CNB2006101099310A CN200610109931A CN100512499C CN 100512499 C CN100512499 C CN 100512499C CN B2006101099310 A CNB2006101099310 A CN B2006101099310A CN 200610109931 A CN200610109931 A CN 200610109931A CN 100512499 C CN100512499 C CN 100512499C
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Abstract
The invention relates to a method for avoiding ping-pang switch, which comprises: based on the signal quality of present network of user terminal and target switch network, fixing the maximum allowed switch frequency; judging if allowing said switch, the real switch frequency is in the maximum value, if it is in said maximum value, allowing this switch; or else, rejecting said switch. The invention also discloses a device with ping-pang switch filter function whose network switch alarm module has ping-pang switch filter function. The invention can effectively reduce the ping-pang switch frequency generated at the edge of dual-network cover, and release the impact on the network processing ability when leading in the region transfer calling function.
Description
Technical field
The present invention relates to the network handoff technique of wireless communication system, particularly a kind of prevent to rattle method of switching and device with table tennis switch filtering function.
Background technology
In the legacy cellular mobile communications network, there is one group of radio plot adjacent one another are on every side in user terminal (UE), at synchronization, a UE only carries out radio communication with one of them radio plot, when UE mobile causes UE to cross over border between two sub-districts, will switch between triggering cell.The switching of conventional cellular network mainly realizes in the bottom access network, generally, this switching between two inner sub-districts of same radio network controller (RNC) carried out, two related sub-districts can belong to different base stations (Node B), also can belong to identical Node B.
In same RNC inside, the trigger process that switch the minizone is:
UE measures its signal strength signal intensity and signal to noise ratio of the downstream signal of one group of radio plot emission on every side in communication process, and this signal measurement information is reported to current radio plot of communicating by letter with it;
RNC receives the signal measurement report that UE sends, and analyze, when the signal measurement report shows: UE weakens to some extent from the signal that the radio plot of communicating by letter with it receives, when for example level intensity, signal to noise ratio descend to some extent, if UE is moved further and away from current radio plot of communicating by letter with it, will cause the further decline of received signal intensity and signal to noise ratio;
When received signal intensity or signal to noise ratio drop to certain threshold values, will switch between triggering cell, at this moment, RNC will be according to certain inter-cell switch method, and UE is switched to another radio plot from the radio plot of current service.
Fig. 1 is that prior art is at the inner method flow diagram of realizing that the minizone is switched of same RNC.Referring to Fig. 1, Node B# 1 is the base station in the current service cell, and Node B# 2 is the base station of will take in the idle district of current area, and this inter-cell switch method may further comprise the steps:
Step 101:UE sends signal measurement report (Measurement Report) to RNC, and RNC selects an idle district that is fit to take over current wireless electricity sub-district according to this signal measurement report in one group of radio plot around the UE.
In this step, RNC selects the standard of sub-district to be: stronger or this idle district of the signal intensity ratio current area that UE receives from this idle district allows UE to communicate than current lower transmitted power level.
The base-station node of step 102:RNC in selected idle district, i.e. Node B# 2 sends and connects the request of setting up (Radio Link Setup Request), and to notify this idle district be that UE reserves radio channel resource.
Step 103:Node B# 2 finishes after the resource reservation, sends acknowledge message (RadioLink Setup Response) to RNC, and the reservation situation of feedback radio channel resource.
Step 104:RNC sends switching command (Active Set Update) according to the affirmation message that receives from Node B# 2 to UE, and the reservation situation of notice UE radio channel resource.
Step 105:UE sets up wireless connections with this idle district according to the switching command from the RNC reception on the wireless channel of reserving, and after connecting foundation, sends switching to RNC and finished message (Active Set Update Complete).
Step 106:RNC receives this switching finished message after, send to connect removal request (Radio Link Deletion Request) to Node B# 1, deletion is connected with cable between the Node B# 1.
After step 107:Node B# 1 deletion connects, return deletion connection response (RadioLink Deletion Response) to RNC.
So far, the minizone switching is finished.
Along with the continuous development of the current communication technology, present communication network is progressively being realized interconnecting of heterogeneous network, promptly realizes the seamless switching of speech business between the network of different structure.Therefore, in the communication process of UE, switch the minizone that not only can occur in the consolidated network, and the switching between the heterogeneous networks will occur.For example, UE shifts in the territory between universal mobile telecommunications system (UMTS) and wireless lan (wlan) (Domain Transfer) and switches, and is exactly a typical example.
UE shifts trigger process from the territory that the UMTS network switches to wlan network: when UE gradually away from the UMTS signal cover, when beginning to enter the WLAN signal cover, UE initiatively initiates the territory to wlan network and shifts handoff request according to the situation of UMTS and the variation of WLAN signal.
Fig. 2 switches to the method flow diagram of wlan network from the UMTS network for prior art UE.Referring to Fig. 2, current UE 1 exists audio call to be connected (VCC) in UMTS circuit domain (CS territory) with UE2, and this territory is shifted changing method and be may further comprise the steps:
Step 201:UE1 sends invitation message (Invite) by wlan network to IP Multimedia System core net (IMS CN); This Invite message comprises called remote subscriber, be conversation initialized protocol (SIP) unified resource sign (URI) and Session Description Protocol (SDP) information of UE2, the called number of this message is a public service identity (PSI) of calling out connection control function (CCCF).
Step 202:IMS CN receives the Invite message that comes from UE1, this message is confirmed, and the Invite message that will confirm is transmitted to CCCF.
Step 203:CCCF acts on behalf of UE1 and makes a call to UE2 according to the called user information of carrying in the received Invite message, and generates a new Invite message and be sent to IMS CN.
Step 204:IMS CN receives the Invite message that comes from CCCF, and this message is sent to UE2.
Step 205:UE2 returns 200 OK response messages to IMS CN after receiving Invite message.
After step 206:IMS CN receives the 200 OK message that come from UE2, this 200 OK message is transmitted to CCCF.
Step 209 is returned ACK message after receiving the 200 OK message that come from CCCF to step 212:UE1, and the affirmation territory is shifted and finished; This message routes to CCCF through IMS CN, is transmitted to UE2 by CCCF again.
Wherein, step 213:CCCF sends the BYE order to IMS CN, initiates to discharge the process of CS territory traffic resource;
What step 214:IMS CN received transmits the BYE order to MGCF (MGCF); After MGCF received this BYE order, order media gateway (MGW) discharged traffic resource;
Step 215:MGCF sends to visited mobile switching center (VMSC) and discharges (Release) order, and order VMSC discharges traffic resource;
Step 216:VMSC sends the Release order to UE1, and order UE1 takes out stitches.
The Release order of step 217:UE1 response VMSC discharges CS territory traffic resource, and returns release to VMSC and finish (Release Complete) message.
After step 218:VMSC receives this Release complete, return release to MGCF and finish (Release Complete) message.
Step 219:MGCF returns 200 OK message to IMS CN, and notice IMS CN traffic resource discharges and finishes.
Step 220:IMS CN transmits to CCCF after receiving this 200 OK message.
So far, switch to the territory transfer handoff procedure end of wlan network from the UMTS network.
UE shifts trigger process from the territory that wlan network switches to the UMTS network: when UE gradually away from the WLAN signal cover, when beginning to enter the UMTS signal cover, UE initiatively initiates the territory to the UMTS network and shifts handoff request according to the situation of UMTS and the variation of WLAN signal.
Fig. 3 switches to the method flow diagram of UMTS network from wlan network for prior art UE.Referring to Fig. 3, UE1 inserts the IMS network by WLAN, and just carries out VoIP with UE2 in the IMS network and communicate by letter, and this territory transfer method may further comprise the steps:
Step 301:UE1 sends to the VMSC of UMTS network and sets up session (Setup) message, and voice conversation is set up in request; The called number form of this request message is the E.164 number of standard, and this number is used for call request is routed to CCCF.
Step 302:VMSC generates initial address message (IAMInitial Address Message) and sends to MGCF according to the Setup message that receives from UE1, and reserves corresponding network trunk circuit resource for calling out.
Step 303:MGCF becomes Invite message with received IAM message translation, and Call Forwarding is to IMS CN.
Step 304 is to step 320, and is similar to step 220 with step 202, do not repeat them here.
So far, switch to the territory transfer handoff procedure end of UMTS network from wlan network.
Switched and the trigger process switched is shifted in the territory as seen by above-mentioned minizone, UE is the promoter of handoff procedure.Before the territory transfer of carrying out between above-mentioned UMTS network and the wlan network, UE need be according to signal strength signal intensity and the signal strength signal intensity of signal quality and wlan network and the situation of change of signal quality of current UMTS network, initiatively send Invite message or the Setup message that connects, CCCF switches with request.
If UE is in the border district of UMTS network and wlan network covering, UMTS signal and WLAN quality of signals that UE receives are all poor; And, because UMTS signal and WLAN signal all might experience decline process at random, fluctuation up and down at random will appear in signal strength signal intensity, in this case, if UE only triggers the territory transfer according to the signal strength signal intensity and the signal quality of network, may cause UE frequently to switch between UMTS network and wlan network, promptly table tennis switches.
In addition, because shifting to switch, the territory between UMTS network and the wlan network realizes that on the core net plane change action each time of UE all is equivalent to initiate a new calling; From the angle of core net disposal ability, be to have increased once new calling to impact.If in the coverage of UMTS network, frequency is shifted in territory between UMTS network and the wlan network, the frequency that switches with present cell mobile communication systems network internal is suitable, so, from network-wide basis, it will be very surprising needing simultaneously treated territory to shift quantity, can't tackle the so numerous territory of quantity simultaneously with the engineering level of present core net and shift.
As seen from the above analysis, UE only triggers territory transfer switching according to the signal strength signal intensity and the signal quality of network in the prior art, to cause UE high-frequency table tennis to occur in the border district of UMTS network and wlan network covering switches, make after introducing the territory forwarding function between UMTS network and the wlan network, bring greater impact to network throughput.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of rattling and switching of preventing, to reduce the frequency that table tennis switches takes place.
Another object of the present invention is to provide a kind of terminal with table tennis switch filtering function, makes terminal can discern and filter table tennis and switches, and to reduce the frequency that table tennis switches takes place.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of method that prevents to rattle and switch is characterized in that this method may further comprise the steps:
According to the signal quality of user terminal UE current place network and target handover network, determine the maximum frequency that allows to switch;
If judge to allow this switching, whether the actual frequency that switches allows to switch within the frequency scope in maximum, if allow to switch in the frequency scope in maximum, then allows this switching; Otherwise, stop this switching.
Further, the network quality rank can be set according to the characteristic of network itself, described signal quality according to network determines that the maximum method that allows to switch frequency can may further comprise the steps:
Be respectively UE current place network and target handover network scoring according to described network quality rank;
According to current place network and target handover network must divide poor, determine the maximum frequency that allows to switch.
Wherein, described characteristic according to network itself be provided with other method of network quality level can for: several threshold values are set, for different threshold ranges are provided with different score values;
Described be the scoring of UE current place network and target handover network method can for: according to the corresponding relation of network signal quality and threshold range, be that network is marked.
Preferably, the described method that several threshold values are set can for: two thresholding T1 and T2 are set;
When the signal quality of described network was on T1, described network got 2 fens;
When the signal quality of described network was between T1 and T2, described network got 1 fen;
When the signal quality of described network was under T2, described network got 0 fen.
Wherein, described signal quality can be with the evaluation criterion that is combined as of signal strength signal intensity RSSI, signal interference ratio SIR or signal strength signal intensity and signal interference ratio;
Correspondingly, being provided with of described threshold value can be with the standard that is combined as of signal strength signal intensity, signal interference ratio or signal strength signal intensity and signal interference ratio;
Described threshold value can set in advance in described UE, also can notify UE with short message mode by short message servers.
Further, can be better than the quality of target handover network according to the quality of the current place of UE network more, the maximum of its correspondence allows to switch the low more principle of frequency, and difference and the maximum mapping table that allows to switch frequency that network must divide are set;
The difference that described network must divide can be provided with in described UE in advance with the maximum mapping table that allows to switch frequency, also can notify UE with short message mode by short message servers;
Described definite maximum method that allows to switch frequency can for: with current place network and target handover network must divide poor, search difference and the maximum mapping table that allows to switch frequency that described network must divide, determine the maximum switching frequency that allows.
Wherein, calculate the described actual method of switching frequency can for:
Time window T1 is set, and remembers that the switching times of having carried out is N in the time of time window T1 appointment, the then actual value of switching frequency F is: F=(N+1)/T1.
Wherein, described method can be used for the trigger network switching; The method that described trigger network switches can may further comprise the steps:
When radio signal quality satisfies the network switching condition, use the described method of switching that prevents to rattle that the switching of rattling is filtered;
When the described method switched of preventing to rattle allowed this to switch, trigger network switched.
Further, described trigger network can comprise before switching: the inquiry carrier policy, judge whether to allow to switch, and when allowing, trigger described network and switch.
Further, described trigger network can comprise before switching: the inquiring user preference, judge whether to allow to switch, and when allowing, trigger described network and switch.
Wherein, described network switches the territory transfer switching between switching, cellular mobile communication networks and the short distance access network that can comprise between any two cellular mobile communication networks;
Described cellular mobile communication networks can comprise: global system for mobile communications GSM, universal mobile telecommunications system UMTS, CDMA access system CDMA;
Described short distance access network can comprise: WLAN (wireless local area network) WLAN, blueteeth network or the WiMAX of World Interoperability for Microwave Access, WiMax system.
A kind of device with table tennis switch filtering function, described device comprises wireless quality and path loss evaluation module, described device also comprises network switching alarm module;
Described network switching alarm module receives the triggering signal come from wireless quality and path loss evaluation module, and according to the network quality of UE current place network and target handover network, determines the maximum switching frequency that allows; If judge to allow this switching, whether the actual frequency that switches allows to switch within the frequency scope in maximum, if allow to switch in the frequency scope in maximum then allow this switching otherwise stop this switching, filters to realize table tennis switched.
Further, described device can comprise the network handover module; Described network handover module can receive the triggering signal that comes from network switching alarm module, and carries out the network switching;
Described network switching alarm module after switching is filtered to table tennis, can be further used for sending triggering signal to described network handover module.
Further, described device can comprise user preference and carrier policy storehouse; Described user preference and carrier policy storehouse can be used for stored user profile information and operator policy information;
Described network switching alarm module before sending triggering signal to described network handover module, can be further used for inquiring user preference and carrier policy storehouse, judges whether user preference or carrier policy allow network to switch.
As seen from the above technical solution, the present invention prevents to rattle the method switched at first according to the signal quality of UE current place network and target handover network, determines the maximum frequency that allows to switch; If judge then to allow this switching, whether the actual frequency that switches allows to switch within the frequency scope in maximum, if allow to switch in the frequency scope in maximum, then allows this switching; Otherwise, stop this switching.Thereby reached the purpose that prevents to rattle and switch, can obviously be reduced in the border districts that two nets cover the frequency that table tennis switches takes place.
In addition, technical solution of the present invention can also be used for trigger network and switch: when radio signal quality satisfied the network switching condition, the method for using the present invention to prevent to rattle to switch was switched table tennis and is filtered; After the table tennis switch filtering successfully passed through, trigger network switched.So, can alleviate frequent network and switch the pressure that network throughput is brought, particularly can alleviate and introduce the impact that network throughput is caused after the field transition calling function.
Description of drawings
Fig. 1 is that prior art is at the inner method flow diagram of realizing that the minizone is switched of same RNC.
Fig. 2 switches to the method flow diagram of wlan network from the UMTS network for prior art UE.
Fig. 3 switches to the method flow diagram of UMTS network from wlan network for prior art UE.
Fig. 4 has the UE internal structure schematic diagram of table tennis switch filtering function for the present invention.
Fig. 5 is the method flow diagram of network switching alarm module trigger network handover module among the UE as shown in Figure 4.
Fig. 6 is the schematic flow sheet of the changing method that prevents from the method as shown in Figure 5 to rattle.
Fig. 7 be as shown in Figure 5 in the method territory shift the schematic flow sheet of changing method.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
Main thought of the present invention is: at first according to the signal quality of UE current place network and target handover network, determine the maximum frequency that allows to switch; If judge then to allow this switching, whether the actual frequency that switches allows to switch within the frequency scope in maximum, if allow to switch in the frequency scope in maximum, then allows this switching; Otherwise, stop this switching.
The present invention's method of switching that prevents to rattle can be used for the method that trigger network switches, and table tennis is switched before switching and filters to be implemented in trigger network.Here, network switches the switching that comprises between any two networks, and switching etc. is shifted in the territory between switching, cellular mobile communication networks and the short distance access network between for example any two cellular mobile networks.Here, described cellular mobile communication networks comprises: global system for mobile communications (GSM), UMTS network, CDMA access system (CDMA) etc.; Described short distance access network comprises: wlan network, blueteeth network, World Interoperability for Microwave Access, WiMax system (WiMAX) etc.
Below in conjunction with accompanying drawing, the enforcement technical solution of the present invention is that example is elaborated in the switching to shift in the territory.
Fig. 4 has the UE internal structure schematic diagram of table tennis switch filtering function for the present invention.Referring to Fig. 4, this UE is made up of communication processor 410, application processor 420 and user interface and loudspeaker module 430;
Wherein, communication processor 410 further comprises: cellular mobile communication protocol stack module 411 and short distance access protocol stack module 412;
Among the UE shown in Figure 4, only occur between two cellular mobile communication networks, in the communication processor 410 short distance access protocol stack module 412 can be set if network switches; In addition, in actual applications, can determine whether to be provided with user preference and carrier policy storehouse 421 in the application processor 420 as required.
Among the UE as shown in Figure 4, cellular mobile communication protocol stack module 411 is used to realize the basic agreement stack of second generation mobile communication (2G) network and 3G (Third Generation) Moblie (3G) network comprise GSM, UMTS, CDMA protocol stack etc.;
And the basic communication management function of UE, comprise call manager (CM), GPRS (GPRS) thread management (GSM), RRM (RR), mobile management functions such as (MM);
Short distance access protocol stack module 412 is used to realize the physical layer and medium access control (MAC) layer function of short distance access technology;
With WLAN is example, and this module is used to realize the physical layer of 802.11a/g/b and the function of MAC layer; Wherein, the function of WLAN physical layer mainly contains: the modulation and demodulation of baseband signal, the coding of signal and decoding; The function of WLAN MAC layer mainly contains: access control (CSMA/CD), and radio band is selected (RadioBand Selection), power control (Power Control) etc.;
User preference and carrier policy storehouse 421 (User Preference ﹠amp; Operator ' s Policy DB), be used for storage and interactive user preference and operator policy information;
Wireless quality and path loss evaluation module 422 (Radio Quality ﹠amp; Path Loss Evaluate), be used to receive and write down the Access Network signal measurement report that comes from cellular mobile communication protocol stack module 411 and the Access Network signal measurement report of short distance access protocol stack module 412, and estimate descending wireless path loss;
Network switching alarm module 423 (Alarm Domain Transfer), reception comes from the triggering signal of wireless quality and path loss evaluation module 422, and switch in analysis-by-synthesis user preference and carrier policy storehouse and to table tennis filter after, trigger network handover module 424;
Network handover module 424 (Domain Transfer Application), be responsible for the Signalling exchange that network switches and the software and hardware resources of control terminal and cooperate network to switch, for example control user interface and loudspeaker module 430 display reminding information, to user's playing alert tones etc.;
User interface and loudspeaker module (GUI ﹠amp; Speaker) 430, graphic user interface (GUI) is used for to user's display reminding information and data; Loud speaker is used for the playing alert tones to the user.
Based on UE shown in Figure 4, shift with the territory between UMTS network and the wlan network below and switch to example, the method that trigger network of the present invention is switched is elaborated.
Fig. 5 is the method flow diagram of network switching alarm module trigger network handover module among the UE as shown in Figure 4.Referring to Fig. 5, the method that this trigger network switches may further comprise the steps:
Step 501: judge whether radio signal quality satisfies the territory and shift switching condition, when satisfying territory transfer switching condition, continue execution in step 502; Otherwise, the method ends flow process.
In this step, can judge from the signal measurement report that communication processor 410 receives whether radio signal quality satisfies switching condition according to it by wireless quality shown in Figure 4 and path loss evaluation module 422.Comprise signal strength signal intensity (RSSI) information and signal interference ratio (SIR) information in the signal measurement report, when measurement result showed that radio signal quality satisfies territory transfer switching condition, trigger network switching alarm module 423 promptly entered method flow shown in Figure 5.In addition, this measurement result can also be used for calculating the initial uplink transmitting power at cellular mobile communication networks or short distance access network.
Because it is same as the prior art to judge whether radio signal quality satisfies the method for switching condition, no longer repeat specification here.
Step 502:, use table tennis switch filtering method that table tennis is switched and filter according to the network quality of current network and target handover network.
The table tennis switch filtering method that adopts in this step as shown in Figure 6.Fig. 6 is the schematic flow sheet of the changing method that prevents from the method as shown in Figure 5 to rattle.Referring to Fig. 6, this method of switching that prevents to rattle may further comprise the steps:
Step 601: the network quality to UE current place network and target handover network is marked.
The present invention is the network quality deciding grade and level according to the signal quality of network in advance, and allows table tennis to switch frequency for the heterogeneous networks quality scale is provided with different maximums.Network quality is good more, and quality scale is high more, and the frequency that allows the generation network to switch is also high more; Other reduces along with the network quality level, and the frequency that allows the generation network to switch is also low more.
In the present embodiment, network quality is marked according to following standards of grading:
According to the characteristic of UMTS network and wlan network itself, respectively to two thresholding: TU1 of these two kinds of network settings, TU2, TW1 and TW2, and corresponding score scope is set respectively.For example, can be respectively UMTS network and wlan network scoring according to the standard shown in table 1 and the table 2.
| Signal quality〉TU1 | TU2＜signal quality＜TU1 | Signal quality＜TU2 | |
| |
2 | 1 | 0 |
Table 1
| Signal quality〉TW1 | TU2＜signal quality＜TW1 | Signal quality＜TW2 | |
| The |
2 | 1 | 0 |
Table 2
As shown in table 1, for the UMTS network,
When signal quality was on TU1, the UMTS network got 2 fens;
When signal quality was between TU1 and TU2, the UMTS network got 1 fen;
When signal quality was under TU2, the UMTS network got 0 fen.
Same reason can be marked for the quality of wlan network according to table 2.
Among the present invention, the threshold value of marking for network can set in advance in UE, also can notify UE with note or other modes by short message servers.
In the present embodiment, two thresholdings are set just illustrate, in actual applications, one, three or other number thresholdings can be set also; In the different threshold ranges score value also can not be in this example 0 minute, 1 minute and 2 minutes, but other values.
In above-mentioned methods of marking, can use signal strength signal intensity representation signal quality, also can use signal interference ratio representation signal quality, can also use the combination representation signal quality of signal strength signal intensity and signal interference ratio; Correspondingly, the setting of thresholding also can be respectively with the standard that is combined as of signal strength signal intensity, signal interference ratio or signal strength signal intensity and signal interference ratio.
In this step, be that network quality is marked according to the standard shown in table 1 and the table 2, and the score of current place network is designated as A, the score of target handover network is designated as B.
Step 602: calculate poor that current place network and target handover network must divide.
In this step, the difference that current place network and target handover network must be able to be divided is designated as C, that is:
C＝A-B。
Step 603: according to two net divide poor, determine the maximum frequency that allows to switch.
The present invention set in advance two net the difference and the maximum mapping table that allows to switch frequency of dividing, as shown in table 3.Table 3 is better than the quality of target handover network more according to the quality of the current place of UE network, and the maximum of its correspondence allows to switch the low more principle setting of frequency, thereby realizes the switching frequency control of classification.
| The C value | -2 | -1 | 0 | 1 | 2 |
| The maximum switching frequency that allows | X1 | X2 | X3 | X4 | X5 |
Table 3
In this step,, can determine the maximum frequency that allows to switch according to C value question blank 3.
Among the present invention, difference that network as shown in table 3 must divide and the maximum mapping table that allows to switch frequency can set in advance in UE, also can notify UE with note or other modes by short message servers.
Because in the step 601, to the network quality score of present embodiment be provided with 0 fen, 1 minute and 2 fens three ranks, therefore, two net to such an extent that only there are five kinds of probable values as shown in table 3 in the difference of dividing in this example.In actual applications, if network quality is provided with other ranks, implement to get final product with reference to this example.
Step 604: allow this to switch if calculate, switch the value of frequency.
In this step, the method for calculating the switching frequency is:
Time window T1 is set, and remembers that the switching times of having carried out is N in the time of time window T1 appointment, so, if allow this to switch, actual switching times will be N+1, and therefore, the value of switching frequency F is:
F＝(N+1)/T1
In the specific implementation, step 601 to step 603 is determined the maximum operation that allows to switch frequency, calculates the operation of switching the frequency value with step 604, can executed in parallel; Also can first execution in step 604, execution in step 601 is to step 603 again.
Step 605: whether the switching frequency F that determining step 604 calculates allows to switch in the frequency scope in maximum, if allow to switch in the frequency scope in maximum, then continues execution in step 606; Otherwise, the method ends flow process.
Step 606: this switching is not filtered, the table tennis switch filtering successfully passes through.
Through as shown in Figure 6 table tennis switch filtering method to table tennis switch filter after, judge that this switchings does not belong to the switching that is filtered, therefore, the table tennis switch filtering successfully passes through, and continues other steps of execution network switching alarm method shown in Figure 5.
Step 503: the inquiry operator policy information, judge whether to allow this switching, if allow, continue execution in step 504; Otherwise, the method ends flow process.
In this step, can be by the operator policy information in inquiry user preference shown in Figure 4 and the carrier policy storehouse 421, to determine whether to allow this switching.
User preference and operator policy information comprise respectively the user search net strategy and network switchover policy and operator search net strategy and network switchover policy; Wherein, user preference information is stored in the user and serves in the internal memory of identification module (USIM) card and terminal; Operator policy information writes usim card when user and operator's signing convention;
If network support and terminal are carried out strategy mutual (Policy Exchange), then terminal can by and CCCF between interface realize dynamically updating of operator policy information, in addition, also can present (Presence) contour level and should be used for realizing dynamically updating of operator policy information by equipment control (DM).
Step 504: the inquiring user preference information, judge whether to allow this switching, if allow, continue execution in step 505; Otherwise, the method ends flow process.
In this step, the method and the step 503 of inquiring user preference information are similar, do not repeat them here.
In the present embodiment, step 502 to step 504 has been carried out successively and has been filtered the operation that table tennis switches, inquires about operator policy information and inquiring user preference information.In actual applications, step 502 to three operations of step 504 also can be carried out according to other order, for example inquiry operator policy information, inquiring user preference information, the switching of filtration table tennis at last then earlier.
Step 505: trigger the territory and shift, carry out the territory and shift switching.
In this step, can carry out the territory by network handover module 424 shown in Figure 4 and shift the operation of switching.Fig. 7 be as shown in Figure 5 in the method territory shift the schematic flow sheet of changing method.Referring to Fig. 7, this territory is shifted changing method and be may further comprise the steps:
Step 701: judge whether UE makes a call from the IMS territory, if continue execution in step 702; Otherwise, continue execution in step 706.
In this step, the method for initiating field transition calling is identical with the method for initiation field transition calling in the prior art: if the target handover network of terminal is a wlan network, then its field transition calling is initiated from the IMS territory; Otherwise its field transition calling is initiated from the CS territory.Because the target handover network difference, to the message difference that network sends, its follow-up operation is also inequality, and therefore, whether the field transition calling that at first needs to judge UE initiates from the IMS territory.
In addition, because present embodiment is to switch to example with the transfer of the territory between UMTS network and the wlan network to describe,, its Rule of judgment is done corresponding conversion get final product for the switching between other networks.
In this step, after UE entered the bimodulus state, network handover module 424 can be controlled the information such as signal quality, network title and operator's sign of two networks of GUI demonstration of user interface and loudspeaker module 430.
Step 702:UE sends Invite message to IMS CN, and called number is the PSI of CCCF.
In this step, UE sends request message to network, when new communication port is set up in request, can play the switch prompting sound, alarm to the user to the user by user interface and loudspeaker module 430.
UE is after IMS CN sends Invite message, and the relevant network equipment will be handled accordingly according to step 202 to the operation of step 208 as shown in Figure 2, not repeat them here.
Step 703:UE receives the 200 OK message that CCCF returns.
Step 704:UE switches to vocoder (Voice Codec) on the passage of network-assigned.
In this step, network handover module 424 is outputted to the output of IMS territory with vocoder from the CS territory after receiving the 200 OK message that network returns.
Step 705: after the vocoder switching finished, UE returned response message (ACK) to network, and the expression terminal is connected speech channel.
So far, the territory is shifted to switch and is finished, and the flow process of follow-up release CS territory traffic resource is same as the prior art, no longer repeat specification here.
Step 706:UE sends Setup message to VMSC, and called number is the E.164 number of CCCF.
In this step, UE sends request message to network, when new communication port is set up in request, can play the switch prompting sound, alarm to the user to the user by user interface and loudspeaker module 430.
UE is after VMSC sends Setup message, and the relevant network equipment will be handled accordingly according to step 302 to the operation of step 311 as shown in Figure 3, not repeat them here.
Step 707:UE receives the 200 OK message that CCCF returns.
Step 708:UE switches to vocoder (Voice Codec) on the passage of network-assigned.
In this step, network handover module 424 is outputted to the output of CS territory with vocoder from the IMS territory after receiving the 200 OK message that network returns.
Step 709: after the vocoder switching finished, UE returned response message (ConnectACK) to network, and the expression terminal is connected speech channel.
So far, the territory is shifted to switch and is finished, and the flow process of follow-up release IMS territory traffic resource is same as the prior art, no longer repeat specification here.
So far, finish the method that trigger network of the present invention switches.
As seen from the above-described embodiment, the present invention prevents to rattle the method switched at first according to the signal quality of UE current place network and target handover network, determines the maximum frequency that allows to switch; If judge then to allow this switching, whether the actual frequency that switches allows to switch within the frequency scope in maximum, if allow to switch in the frequency scope in maximum, then allows this switching; Otherwise, stop this switching.Thereby reached the purpose that prevents to rattle and switch, can obviously be reduced in the border districts that two nets cover the frequency that table tennis switches takes place.
In addition, technical solution of the present invention can also be used for trigger network and switch: when radio signal quality satisfied the network switching condition, the method for using the present invention to prevent to rattle to switch was switched table tennis and is filtered; After the table tennis switch filtering successfully passed through, trigger network switched.So, can alleviate frequent network and switch the pressure that network throughput is brought, particularly can alleviate and introduce the impact that network throughput is caused after the field transition calling function.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1, a kind of method that prevents to rattle and switch is characterized in that this method may further comprise the steps:
According to the signal quality of user terminal UE current place network and target handover network, determine the maximum frequency that allows to switch;
If judge to allow this switching, whether the actual frequency that switches allows to switch within the frequency scope in maximum, if allow to switch in the frequency scope in maximum, then allows this switching; Otherwise, stop this switching.
2, method according to claim 1 is characterized in that, further the characteristic according to network itself is provided with the network quality rank, and described signal quality according to network determines that the maximum method that allows to switch frequency may further comprise the steps:
Be respectively UE current place network and target handover network scoring according to described network quality rank;
According to current place network and target handover network must divide poor, determine the maximum frequency that allows to switch.
3, method according to claim 2 is characterized in that, described characteristic according to network itself is provided with other method of network quality level and is: several threshold values are set, for different threshold ranges are provided with the different score values that get;
Described method for UE current place network and target handover network scoring is: according to the corresponding relation of network signal quality and threshold range, be the network scoring.
4, method according to claim 3 is characterized in that, the described method that several threshold values are set is: two thresholding T1 and T2 are set;
When the signal quality of described network was on T1, described network got 2 fens;
When the signal quality of described network was between T1 and T2, described network got 1 fen;
When the signal quality of described network was under T2, described network got 0 fen.
5, method according to claim 3 is characterized in that, described signal quality is with the evaluation criterion that is combined as of signal strength signal intensity RSSI, signal interference ratio SIR or signal strength signal intensity and signal interference ratio;
Correspondingly, the setting of described threshold value is with the standard that is combined as of signal strength signal intensity, signal interference ratio or signal strength signal intensity and signal interference ratio;
Described threshold value sets in advance in described UE or by short message servers and notifies UE with short message mode.
6, method according to claim 2, it is characterized in that, the quality that further is better than target handover network according to the quality of the current place of UE network more, the maximum of its correspondence allow to switch the low more principle of frequency, and difference and the maximum mapping table that allows to switch frequency that network must divide are set;
The difference that described network must divide allows the mapping table of switching frequency to be provided with in described UE in advance with maximum or notifies UE by short message servers with short message mode;
Described definite maximum method that allows to switch frequency is: with current place network and target handover network must divide poor, search difference and the maximum mapping table that allows to switch frequency that described network must divide, determine the maximum switching frequency that allows.
7, method according to claim 2 is characterized in that, calculates the described actual method of switching frequency to be:
Time window T1 is set, and remembers that the switching times of having carried out is N in the time of time window T1 appointment, the then actual value of switching frequency F is: F=(N+1)/T1.
8, method according to claim 1 is characterized in that, described method is used for trigger network and switches; The method that described trigger network switches may further comprise the steps:
When radio signal quality satisfies the network switching condition, use the described method of switching that prevents to rattle that the switching of rattling is filtered;
When the described method switched of preventing to rattle allowed this to switch, trigger network switched.
9, method according to claim 8 is characterized in that, described trigger network further comprises before switching: the inquiry carrier policy, judge whether to allow to switch, and when allowing, trigger described network and switch.
10, method according to claim 8 is characterized in that, described trigger network further comprises before switching: the inquiring user preference, judge whether to allow to switch, and when allowing, trigger described network and switch.
11, method according to claim 8 is characterized in that, switching is shifted in the territory that described network switches between switching, cellular mobile communication networks and the short distance access network that comprises between any two cellular mobile communication networks;
Described cellular mobile communication networks comprises: global system for mobile communications GSM, universal mobile telecommunications system UMTS, CDMA access system CDMA;
Described short distance access network comprises: WLAN (wireless local area network) WLAN, blueteeth network or the WiMAX of World Interoperability for Microwave Access, WiMax system.
12, a kind of device with table tennis switch filtering function, described device comprises wireless quality and path loss evaluation module, it is characterized in that, described device comprises network switching alarm module;
Described network switching alarm module receives the triggering signal come from wireless quality and path loss evaluation module, and according to the network quality of UE current place network and target handover network, determines the maximum switching frequency that allows; If judge to allow this switching, whether the actual frequency that switches allows to switch within the frequency scope in maximum, if allow to switch in the frequency scope in maximum then allow this switching otherwise stop this switching, filters to realize table tennis switched.
13, device according to claim 12 is characterized in that, described device further comprises the network handover module;
Described network handover module receives the triggering signal that comes from network switching alarm module, and carries out the network switching;
Described network switching alarm module after switching is filtered to table tennis, is further used for sending triggering signal to described network handover module.
14, device according to claim 13 is characterized in that, described device further comprises user preference and carrier policy storehouse;
Described user preference and carrier policy storehouse are used for stored user profile information and operator policy information;
Described network switching alarm module before sending triggering signal to described network handover module, is further used for inquiring user preference and carrier policy storehouse, judges whether user preference or carrier policy allow network to switch.
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| CNB2006101099310A CN100512499C (en) | 2006-08-24 | 2006-08-24 | Method for preventing ping-pong switch and device with ping-pong switch filtering function |
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| CNB2006101099310A CN100512499C (en) | 2006-08-24 | 2006-08-24 | Method for preventing ping-pong switch and device with ping-pong switch filtering function |
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| CN100512499C true CN100512499C (en) | 2009-07-08 |
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| CN101945435A (en) * | 2010-09-29 | 2011-01-12 | 上海顶竹通讯技术有限公司 | Network with a plurality of access networks and access and switching method |
| CN102291746A (en) * | 2011-09-20 | 2011-12-21 | 海南大学 | Mobile management system and management method based on IPv6 heterogeneous convergence network |
| JP5916262B2 (en) * | 2012-03-05 | 2016-05-11 | ホアウェイ・テクノロジーズ・カンパニー・リミテッド | Handover method in cellular radio communication system |
| WO2014107881A1 (en) * | 2013-01-11 | 2014-07-17 | Qualcomm Incorporated | Method and apparatus for fast handover evaluation |
| CN104105154A (en) * | 2013-04-01 | 2014-10-15 | 电信科学技术研究院 | Network switching judgment method and device |
| WO2015066917A1 (en) * | 2013-11-11 | 2015-05-14 | 华为技术有限公司 | Method and device for enabling interoperability |
| CN105101329A (en) * | 2014-05-22 | 2015-11-25 | 宏达国际电子股份有限公司 | Mobile communication device and mobile communication method thereof |
| EP2996355A1 (en) * | 2014-09-15 | 2016-03-16 | Gemalto M2M GmbH | Method for downloading a subscription to an identification unit |
| CN104581855A (en) * | 2014-12-23 | 2015-04-29 | 大唐移动通信设备有限公司 | Method and system for optimizing inter-operation of 3G network and 4G network |
| CN104853389B (en) * | 2015-05-12 | 2018-09-25 | 大唐移动通信设备有限公司 | A kind of method and device of handover between cells |
| CN105554830B (en) * | 2015-09-25 | 2019-06-11 | 宇龙计算机通信科技(深圳)有限公司 | A kind of network mode switch protecting method and device |
| US10187841B1 (en) * | 2017-09-29 | 2019-01-22 | Wipro Limited | Method and system for switching data-paths in heterogeneous wireless communication networks |
| CN111567071B (en) * | 2018-07-02 | 2022-02-15 | 华为技术有限公司 | Interoperation management method, equipment and storage medium |
| CN111181896A (en) * | 2018-11-12 | 2020-05-19 | 中国移动通信集团重庆有限公司 | Voice call fallback control method, device, equipment and medium |
| SG10202104533XA (en) * | 2021-05-03 | 2021-11-29 | Garena Online Private Ltd | Method of switching between data connections for mobile communication devices |
| CN116684897B (en) * | 2022-02-23 | 2024-04-23 | 荣耀终端有限公司 | Communication method and communication device |
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