CN102612069B - Based on the method that in the mobile communication system of IP carrying and system small area switches - Google Patents
Based on the method that in the mobile communication system of IP carrying and system small area switches Download PDFInfo
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Abstract
The invention discloses a kind of method of mobile communication system based on IP carrying and the switching of system small area, described system comprises: base station and upper level network element; Described method comprises: in mobile terminal calling process, and serving BS utilizes the transmission quality of RTCP Real-time Transport Control Protocol to IP operation link to measure, and measurement result is reported upper level network element; Described upper level network element, when judging that the transmission quality of described IP operation link can not meet default requirement according to the measurement result received, triggers the cell merge flow process for described mobile terminal.Adopt after the present invention, poor and in the good situation of radio link quality, make system can attempt carrying out cell merge in IP operation link transmission quality, thus under certain condition, improve user's communication perceptibility, reduce cutting off rate, improve the overall performance of mobile network.
Description
Technical field
The present invention relates to mobile communications network, particularly relate to a kind of method of mobile communication system based on IP carrying and the switching of system small area.
Background technology
In mobile subscriber's communication process, in order to make call setup in the community that signal quality is best and in order to make calling be unlikely to call drop, introduce the concept of cell merge.In other words, converse when the object of cell merge ensures that mobile terminal moves to another community from a community exactly and can proceed, to meet the needs of network management.
In existing mobile communication process, the judgement switched is depended on that in communication process, mobile terminal is regularly to the report of measuring down wireless link that network sends, and the report that Current Serving BTS is measured uplink radio link, these two parts of measurement reports are adjudicated delivering in upper level network element simultaneously, as the initial conditions of switch decision.Mainly comprise in wireless measurement report: the measurement result parameters such as signal level, signal quality, Timing Advance.
As shown in Figure 1, existing cell merge flow process comprises:
Step 1, in mobile terminal calling process, mobile terminal and serving BS are measured current wireless quality respectively, mobile terminal can by result by wireless measurement report reporting to serving BS;
The mobile terminal received is reported to its wireless measurement sent and is measured the wireless measurement report obtained voluntarily and together sends to upper level network element by step 2, serving BS;
If step 3, upper level network element are according to the wireless measurement report received and switch decision condition, judge to need to carry out cell merge to this mobile terminal, then perform cell merge flow process; Otherwise, do not carry out handover operation.
For the mobile communications network carried based on IP, if consider that it is incomplete for whether carrying out cell merge from the incoming level, the quality of reception etc. of signal to wireless relevant angle merely.Such as, under severe IP network environment (such as under satellite transmission environment), because the indexs such as time delay, shake, packet loss worsen, often cannot ensure voice quality; But then, if the parameter such as shown Signal reception level or the quality of reception is all fine in the wireless measurement report reported at mobile terminal and base station, the condition of existing cell merge can not just be met.In such cases, along with the progressively deterioration of IP network environment, mobile terminal voice conversation quality (such as speech discontinuous, occur noise etc.) gently then can be reduced, heavy then there will be relevant IP link down, and then cause mobile terminal call drop.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method of mobile communication system based on IP carrying and the switching of system small area, existing based on poor and in the good situation of radio link quality, do not carry out the defect of cell merge in IP operation link transmission quality in the mobile communication system of IP carrying to overcome.
For solving the problem, the invention provides a kind of method switched based on the mobile communication system small area of IP carrying, comprising:
In mobile terminal calling process, serving BS utilizes the transmission quality of RTCP Real-time Transport Control Protocol to IP operation link to measure, and measurement result is reported upper level network element;
Described upper level network element, when judging that the transmission quality of described IP operation link can not meet default requirement according to the measurement result received, triggers the cell merge flow process for described mobile terminal.
Further,
Carry the one group parameter relevant with the transmission quality of current IP service link in described measurement result, often in group parameter, comprise any class in time delay, shake, packet loss or combination in any.
Further,
Measurement result is reported upper level network element, specifically comprises: described serving BS every a setting cycle to report to described upper level network element once the transmission quality of described IP operation link is measured after the measurement result that obtains;
According to the measurement result received, described upper level network element is when judging that the transmission quality of described IP operation link can not meet default requirement, specifically comprise: described upper level network element according to the P group parameter of carrying in P measurement result receiving, when judging that the transmission quality of described IP operation link can not meet default requirement; Wherein, P is positive integer.
Further,
Described upper level network element according to the P group parameter of carrying in P measurement result receiving, when judging that the transmission quality of described IP operation link can not meet default requirement, specifically comprises:
In described P group parameter, judge whether that the above parameter of N group does not meet first condition, if so, then think that the transmission quality of described IP operation link does not meet the requirement preset;
Wherein, N is the positive integer being less than or equal to P; Described first condition refers to: for each group parameter, wherein the value of partial parameters is less than or equal to threshold value corresponding to the parameter of respective classes; Or described first condition refers to: for each group parameter, wherein all the value of parameter is all less than or equal to threshold value corresponding to the parameter of respective classes.
Further,
Described upper level network element according to the P group parameter of carrying in P measurement result receiving, when judging that the transmission quality of described IP operation link can not meet default requirement, specifically comprises:
In described P group parameter, respectively mean value computation is carried out according to classification to the parameter of part or all of classification, if judge, part or all of average is all more than or equal to threshold value corresponding to the parameter of respective classes, then think that the transmission quality of described IP operation link does not meet the requirement preset.
Further,
Described measurement result is reported upper level network element, specifically comprises:
Described measurement result and wireless measurement are reported and together reports described upper level network element;
Described method also comprises:
Described upper level network element, when the described wireless measurement report judging to receive meets wireless switch decision condition, triggers the cell merge flow process for described mobile terminal.
Present invention also offers a kind of mobile communication system based on IP carrying, comprising: base station and upper level network element;
Measurement mechanism in described base station is used for, in the communication process of the mobile terminal in the service range of described base station, utilizing the transmission quality of RTCP Real-time Transport Control Protocol to IP operation link to measure, and measurement result being reported upper level network element;
Switch decision device in described upper level network element is used for, when judging that the transmission quality of described IP operation link can not meet default requirement according to the measurement result received, triggering the cell merge flow process for described mobile terminal.
Further,
Carry the one group parameter relevant with the transmission quality of current IP service link in described measurement result, often in group parameter, comprise any class in time delay, shake, packet loss or combination in any.
Further,
Described measurement mechanism is used for measurement result to report upper level network element, specifically comprises: described measurement mechanism be used for every a setting cycle to report to described upper level network element once the transmission quality of described IP operation link is measured after the measurement result that obtains;
Described switch decision device is used for when judging that the transmission quality of described IP operation link can not meet default requirement according to the measurement result received, specifically comprise: described switch decision device is used for the P group parameter of carrying in P the measurement result received in basis, when judging that the transmission quality of described IP operation link can not meet default requirement; Wherein, P is positive integer.
Further,
Described switch decision device is used for the P group parameter of carrying in P the measurement result received in basis, when judging that the transmission quality of described IP operation link can not meet default requirement, specifically comprises:
Described switch decision device is used for judging, in described P group parameter, whether have the above parameter of N group not meet first condition, if so, then thinks that the transmission quality of described IP operation link does not meet the requirement preset;
Wherein, N is the positive integer being less than or equal to P; Described first condition refers to: for each group parameter, wherein the value of partial parameters is less than or equal to threshold value corresponding to the parameter of respective classes; Or described first condition refers to: for each group parameter, wherein all the value of parameter is all less than or equal to threshold value corresponding to the parameter of respective classes.
Further,
Described switch decision device is used for the P group parameter of carrying in P the measurement result received in basis, when judging that the transmission quality of described IP operation link can not meet default requirement, specifically comprises:
Described switch decision device is used in described P group parameter, respectively mean value computation is carried out according to classification to the parameter of part or all of classification, if judge, part or all of average is all more than or equal to threshold value corresponding to the parameter of respective classes, then think that the transmission quality of described IP operation link does not meet the requirement preset.
Further,
Described measurement mechanism is used for measurement result to report upper level network element, specifically comprises:
Described measurement mechanism together reports described upper level network element for described measurement result and wireless measurement being reported;
When described switch decision device is also for meeting wireless switch decision condition in the described wireless measurement report judging to receive, trigger the cell merge flow process for described mobile terminal.
Adopt after the present invention, poor and in the good situation of radio link quality, make system can attempt carrying out cell merge in IP operation link transmission quality, thus under certain condition, improve user's communication perceptibility, reduce cutting off rate, improve the overall performance of mobile network.
Accompanying drawing explanation
Fig. 1 is existing cell switch determining method flow chart;
Fig. 2 is based on the method flow diagram that the mobile communication system small area of IP carrying switches in the embodiment of the present invention;
Fig. 3 is embodiment of the present invention small area switch determining method flow chart.
Embodiment
Hereinafter will be described in detail to embodiments of the invention by reference to the accompanying drawings.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.
In the present embodiment, the method that the mobile communication system small area based on IP carrying switches, as shown in Figure 2, comprising:
Step 10, in mobile terminal calling process, serving BS utilizes RTCP(Real-timeTransportControlProtocol, RTCP Real-time Transport Control Protocol) transmission quality of IP operation link is measured, and measurement result is reported upper level network element;
Wherein, the process that reports of measurement result can periodically be carried out, namely report the measurement result once carrying one group of parameter relevant with the transmission quality of above-mentioned IP service link every a setting cycle, often in group parameter, comprise any class in time delay, shake, packet loss or combination in any;
Step 20, upper level network element, when judging that the transmission quality of this IP operation link can not meet default requirement according to the measurement result received, trigger the cell merge flow process for above-mentioned mobile terminal.
In order to avoid frequent switching, in another embodiment, upper level network element can judge according to the P group parameter of carrying in P the measurement result received whether the transmission quality of this IP operation link meets the requirement preset, wherein, P is positive integer, and its value can be preconfigured in upper level network element by manual type.Deterministic process can adopt in following manner any one:
Mode one:
In the P group parameter received, judge whether that the above parameter of N group does not meet first condition, if so, then think that the transmission quality of this IP operation link does not meet the requirement preset; Otherwise, think that the transmission quality of this IP operation link meets default requirement.Wherein, N is the positive integer being less than or equal to P, and its value can also be preconfigured in upper level network element by manual type; First condition refers to: for each group parameter, wherein the value of partial parameters is less than or equal to threshold value corresponding to the parameter of respective classes; Or for each group parameter, wherein all the value of parameter is all less than or equal to threshold value corresponding to the parameter of respective classes.
Mode two:
In the P group parameter received, respectively mean value computation is carried out according to classification to the parameter of part or all of classification, if judge, part or all of average is all more than or equal to threshold value corresponding to the parameter of respective classes, then think that the transmission quality of this IP operation link does not meet the requirement preset; Otherwise, think that the transmission quality of this IP operation link meets default requirement.
In above-mentioned two kinds of modes, the thresholding that parameter of all categories is corresponding is respectively: thresholding corresponding to time delay is time delay thresholding, and its unit is millisecond; The thresholding of shake correspondence is shake thresholding, and unit is millisecond; The thresholding that packet loss is corresponding is packet loss thresholding, and unit is percentage.In addition, all kinds of parameter such as time delay, shake, packet loss comprises up, descending and two-way three direction of measurement.
In another embodiment of the invention, above-mentioned measurement result and wireless measurement report together can be reported upper level network element by serving BS; Upper level network element, when the wireless measurement report judging to receive meets the second switch decision condition, can also trigger the cell merge flow process for above-mentioned mobile terminal.Wherein, the second switch decision condition can adopt the switch decision condition used in existing cell merge flow process.
In the case, above-mentioned cell switching method can regard that existing the effective of cell switching method measured based on wireless quality supplements as, and both can join together to use together.One of specifically, both are coordination, as long as both namely meeting, can triggering cell switching flow.
Below in conjunction with accompanying drawing, technical solution of the present invention is further described in detail.
Based on the method that the mobile communication system small area of IP carrying switches, as shown in Figure 3, comprising:
Step 1: set by backstage, enables new cell switch determining method.Meanwhile, the relevant parameter such as RTCP every threshold value (comprising: any one or combination in any in time delay thresholding, shake thresholding, packet loss thresholding), IP operation link transmission quality value measuring period, P value, N value is configured;
Step 2: in the communication process of mobile terminal, serving BS uses the transmission quality of RTCP to IP operation link to measure, and according to IP operation link transmission quality value measuring period of above-mentioned configuration, measurement result is reported to upper level network element.Meanwhile, the wireless measurement report by obtaining wireless link measurement is also reported to upper level network element by this serving BS;
Step 3: upper level network element is after collecting the transmission quality measurement result of P IP operation link, judge wherein whether have the value of the part or all of parameter comprised in N number of above measurement result to exceed corresponding thresholding, if had, then trigger the cell merge flow process for this mobile terminal; If no, then carry out step 4.
It should be noted that, in the process gathering measurement result, upper level network element can use sliding window mechanism, P value is the size of sliding window, often collects 1 measurement result, window forward slip 1 unit, after often collecting P measurement result, above-mentioned deterministic process can be carried out once;
Step 4: upper level network element collects the report of existing wireless measurement, judges whether to meet switching condition by current mechanism.If met, then trigger the cell merge flow process for this mobile terminal, if do not met, then do not carry out the cell merge for this mobile terminal.
Note: in realization flow, step 3 and step 4 can be exchanged, and both are coordination.
In the present embodiment, the described mobile communication system based on IP carrying, comprising: base station and upper level network element;
Measurement mechanism in described base station is used for, in the communication process of the mobile terminal in the service range of described base station, utilizing the transmission quality of RTCP Real-time Transport Control Protocol to IP operation link to measure, and measurement result being reported upper level network element;
Switch decision device in described upper level network element is used for, when judging that the transmission quality of described IP operation link can not meet default requirement according to the measurement result received, triggering the cell merge flow process for described mobile terminal.
More preferably,
Carry the one group parameter relevant with the transmission quality of current IP service link in described measurement result, often in group parameter, comprise any class in time delay, shake, packet loss or combination in any.
More preferably,
Described measurement mechanism is used for measurement result to report upper level network element, specifically comprises: described measurement mechanism be used for every a setting cycle to report to described upper level network element once the transmission quality of described IP operation link is measured after the measurement result that obtains;
Described switch decision device is used for when judging that the transmission quality of described IP operation link can not meet default requirement according to the measurement result received, specifically comprise: described switch decision device is used for the P group parameter of carrying in P the measurement result received in basis, when judging that the transmission quality of described IP operation link can not meet default requirement; Wherein, P is positive integer.
More preferably,
Described switch decision device is used for the P group parameter of carrying in P the measurement result received in basis, when judging that the transmission quality of described IP operation link can not meet default requirement, specifically comprises:
Described switch decision device is used for judging, in described P group parameter, whether have the above parameter of N group not meet first condition, if so, then thinks that the transmission quality of described IP operation link does not meet the requirement preset;
Wherein, N is the positive integer being less than or equal to P; Described first condition refers to: for each group parameter, wherein the value of partial parameters is less than or equal to threshold value corresponding to the parameter of respective classes; Or described first condition refers to: for each group parameter, wherein all the value of parameter is all less than or equal to threshold value corresponding to the parameter of respective classes.
More preferably,
Described switch decision device is used for the P group parameter of carrying in P the measurement result received in basis, when judging that the transmission quality of described IP operation link can not meet default requirement, specifically comprises:
Described switch decision device is used in described P group parameter, respectively mean value computation is carried out according to classification to the parameter of part or all of classification, if judge, part or all of average is all more than or equal to threshold value corresponding to the parameter of respective classes, then think that the transmission quality of described IP operation link does not meet the requirement preset.
More preferably,
Described measurement mechanism is used for measurement result to report upper level network element, specifically comprises:
Described measurement mechanism together reports described upper level network element for described measurement result and wireless measurement being reported;
When described switch decision device is also for meeting wireless switch decision condition in the described wireless measurement report judging to receive, trigger the cell merge flow process for described mobile terminal.
Below with the GSM(GlobalSystemforMobileCommunications carried based on IP, global system for mobile telecommunications) system is that the present invention will be described for example.
Application example one
Step 1: the cell merge function of enabling based on RTCP measurement function is set from backstage; (two-way) time delay thresholding arranging RTCP is 600ms, and (descending) shake thresholding is 30ms, and (descending) packet loss thresholding is 3%; RTCP measurement result report cycle value T is 3 seconds; P value is 5, N value is 3;
Step 2: call starts, and the measurement result of RTCP can be reported to upper level network element BSC(BaseStationController, base station controller every 3 seconds by serving BS side), BSC collects front P(P=5) measurement result of individual RTCP is as shown in table 1.
The measurement result that step 3:BSC collects according to step 2, judges whether trigger the cell merge flow process for this mobile terminal, specifically comprise:
1), in measurement result 1, two-way time delay 620ms is more than 600ms thresholding;
2), in measurement result 2, descending shake 35ms is more than 30ms thresholding;
3), in measurement result 3, parameter is not had to exceed corresponding threshold value;
4), in measurement result 4, two-way time delay 650ms is more than 600ms thresholding, and descending shake 35ms is more than 30ms thresholding, and descending packet loss 4% is more than 3% thresholding;
5), in measurement result 5, descending packet loss 5% is more than 3% thresholding.
In sum, P(P=5) organize in measurement result, there are 4 to exceed RTCP and measure dependent threshold.And 4 are greater than N(N=3).Therefore, the cell merge flow process for above-mentioned mobile terminal is triggered.
Application example two
Step 1: the cell merge function of enabling based on RTCP measurement function is set from backstage; (descending) shake thresholding arranging RTCP is 30ms, and (descending) packet loss thresholding is 3%, does not arrange time delay dependent threshold; The report cycle T of RTCP measurement result is 4 seconds; P value is 4, N value is 3;
Step 2: call starts, and the measurement result of RTCP was reported to BSC every 4 seconds by serving BS side.A period of time after call starts, the P(P=4 that BSC is collected by sliding window mechanism) measurement result of individual RTCP is as shown in table 2.Meanwhile, serving BS side by wireless measurement report reporting to BSC.
The measurement result that step 3:BSC collects according to step 2, judges whether trigger the cell merge flow process for this mobile terminal, specifically comprise:
1), in measurement result 1, descending shake 35ms is more than 30ms thresholding;
2), in measurement result 2, parameter is not had to exceed corresponding thresholding;
3), in measurement result 3, parameter is not had to exceed corresponding thresholding;
4), in measurement result 4, parameter is not had to exceed corresponding thresholding;
In sum, P(P=4) organize in measurement result, there is 1 to exceed RTCP and measure dependent threshold.And 1 is less than N(N=3).Therefore, the cell merge flow process for above-mentioned mobile terminal is not triggered.
Step 4: follow and report according to existing wireless measurement, adjudicates the cell merge whether carried out for above-mentioned mobile terminal.
The all or part of step that one of ordinary skill in the art will appreciate that in said method is carried out instruction related hardware by program and is completed, and described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can use one or more integrated circuit to realize.Correspondingly, each module/unit in above-described embodiment can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
The foregoing is only the preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.According to summary of the invention of the present invention; also can there be other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention; within the spirit and principles in the present invention all; any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1., based on the method that the mobile communication system small area of IP carrying switches, comprising:
In mobile terminal calling process, serving BS utilizes the transmission quality of RTCP Real-time Transport Control Protocol to IP operation link to measure, and measurement result is reported upper level network element;
Described upper level network element, when judging that the transmission quality of described IP operation link can not meet default requirement according to the measurement result received, triggers the cell merge flow process for described mobile terminal.
2. the method for claim 1, is characterized in that:
Carry the one group parameter relevant with the transmission quality of current IP service link in described measurement result, often in group parameter, comprise any class in time delay, shake, packet loss or combination in any.
3. method as claimed in claim 2, is characterized in that:
Measurement result is reported upper level network element, specifically comprises: described serving BS every a setting cycle to report to described upper level network element once the transmission quality of described IP operation link is measured after the measurement result that obtains;
According to the measurement result received, described upper level network element is when judging that the transmission quality of described IP operation link can not meet default requirement, specifically comprise: described upper level network element according to the P group parameter of carrying in P measurement result receiving, when judging that the transmission quality of described IP operation link can not meet default requirement; Wherein, P is positive integer.
4. method as claimed in claim 3, is characterized in that:
Described upper level network element according to the P group parameter of carrying in P measurement result receiving, when judging that the transmission quality of described IP operation link can not meet default requirement, specifically comprises:
In described P group parameter, judge whether that the above parameter of N group does not meet first condition, if so, then think that the transmission quality of described IP operation link does not meet the requirement preset;
Wherein, N is the positive integer being less than or equal to P; Described first condition refers to: for each group parameter, wherein the value of partial parameters is less than or equal to threshold value corresponding to the parameter of respective classes; Or described first condition refers to: for each group parameter, wherein all the value of parameter is all less than or equal to threshold value corresponding to the parameter of respective classes.
5. method as claimed in claim 3, is characterized in that:
Described upper level network element according to the P group parameter of carrying in P measurement result receiving, when judging that the transmission quality of described IP operation link can not meet default requirement, specifically comprises:
In described P group parameter, respectively mean value computation is carried out according to classification to the parameter of part or all of classification, if judge, part or all of average is all more than or equal to threshold value corresponding to the parameter of respective classes, then think that the transmission quality of described IP operation link does not meet the requirement preset.
6., based on a mobile communication system for IP carrying, comprising: base station and upper level network element;
Measurement mechanism in described base station is used for, in the communication process of the mobile terminal in the service range of described base station, utilizing the transmission quality of RTCP Real-time Transport Control Protocol to IP operation link to measure, and measurement result being reported upper level network element;
Switch decision device in described upper level network element is used for, when judging that the transmission quality of described IP operation link can not meet default requirement according to the measurement result received, triggering the cell merge flow process for described mobile terminal.
7. system as claimed in claim 6, is characterized in that:
Carry the one group parameter relevant with the transmission quality of current IP service link in described measurement result, often in group parameter, comprise any class in time delay, shake, packet loss or combination in any.
8. system as claimed in claim 7, is characterized in that:
Described measurement mechanism is used for measurement result to report upper level network element, specifically comprises: described measurement mechanism be used for every a setting cycle to report to described upper level network element once the transmission quality of described IP operation link is measured after the measurement result that obtains;
Described switch decision device is used for when judging that the transmission quality of described IP operation link can not meet default requirement according to the measurement result received, specifically comprise: described switch decision device is used for the P group parameter of carrying in P the measurement result received in basis, when judging that the transmission quality of described IP operation link can not meet default requirement; Wherein, P is positive integer.
9. system as claimed in claim 8, is characterized in that:
Described switch decision device is used for the P group parameter of carrying in P the measurement result received in basis, when judging that the transmission quality of described IP operation link can not meet default requirement, specifically comprises:
Described switch decision device is used for judging, in described P group parameter, whether have the above parameter of N group not meet first condition, if so, then thinks that the transmission quality of described IP operation link does not meet the requirement preset;
Wherein, N is the positive integer being less than or equal to P; Described first condition refers to: for each group parameter, wherein the value of partial parameters is less than or equal to threshold value corresponding to the parameter of respective classes; Or described first condition refers to: for each group parameter, wherein all the value of parameter is all less than or equal to threshold value corresponding to the parameter of respective classes.
10. system as claimed in claim 8, is characterized in that:
Described switch decision device is used for the P group parameter of carrying in P the measurement result received in basis, when judging that the transmission quality of described IP operation link can not meet default requirement, specifically comprises:
Described switch decision device is used in described P group parameter, respectively mean value computation is carried out according to classification to the parameter of part or all of classification, if judge, part or all of average is all more than or equal to threshold value corresponding to the parameter of respective classes, then think that the transmission quality of described IP operation link does not meet the requirement preset.
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| CN1750710A (en) * | 2004-08-27 | 2006-03-22 | 三星电子株式会社 | Be used to have the changing method of the next generation mobile communication system of overlapping region |
| CN1901742A (en) * | 2006-07-21 | 2007-01-24 | 华为技术有限公司 | Channel switching method |
| CN101365169A (en) * | 2007-08-09 | 2009-02-11 | 华为技术有限公司 | Routing control implementing method, system, media gateway and media gateway controller |
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| CN1460389A (en) * | 2000-03-31 | 2003-12-03 | 诺基亚公司 | Handover in wireless mobile-IP network |
| CN1750710A (en) * | 2004-08-27 | 2006-03-22 | 三星电子株式会社 | Be used to have the changing method of the next generation mobile communication system of overlapping region |
| CN1901742A (en) * | 2006-07-21 | 2007-01-24 | 华为技术有限公司 | Channel switching method |
| CN101365169A (en) * | 2007-08-09 | 2009-02-11 | 华为技术有限公司 | Routing control implementing method, system, media gateway and media gateway controller |
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