CN100441039C - Switching method of mobile communication network different system - Google Patents
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Abstract
The present invention discloses a switching method of mobile communication network different systems, which belongs to the field of communication. The switching method flexibly and effectively controls measurement of different systems in a compression mode and enhances measurement efficiency. The switching method of mobile communication network different systems can ensure correct switch from 3G to 2G and can also reduce the influence of the measurement in a compression mode on the systems to the largest extent. In the present invention, on one hand, a sequence in a compression mode is firstly started; the RSSI of a GSM is measured and judged; under the condition that the RSSI satisfies a switching threshold, other succeeding work is carried out; on the other hand, a target cell is determined whether or not the target cell can be determined by a unique factor by judging obtained frequency point information in the front measurement of the RSSI of the GSM; if the target cell can be uniquely determined, the switch of different systems is directly originated to the target cell; if the target cell can not be uniquely determined, other two sequences in a compression mode with measurement objects of GSM Initial BSIC identification and GSM BSIC re-confirmation are activated.
Description
Technical field
The present invention relates to the communications field, particularly the different system handoff technique from 3G (Third Generation) Moblie (TheThird Generation is called for short " 3G ") system to second generation mobile communication (The SecondGeneration, abbreviation " 2G ") in the mobile communication.
Background technology
Since at the end of last century, the communication technology has obtained fast development.Initial first generation mobile communication system by 1981, has been set up analog mobile communication system for the simulation standard, as Advanced Mobile Phone System (Advanced Mobile Phone System, be called for short " AMPS ") etc.Second generation mobile communication system (2nd Generation, be 2G) to transmit the digital communication system of voice-and-data, exemplary systems has employing time division multiple access (Time DivisionM ultiple Access, abbreviation " TDMA ") global system for mobile communications of mode (Global System for mobile Communication is called for short " GSM ").2G also can provide low-rate data service and Short Message Service except that voice communications services is provided.So-called 3-G (Generation Three mobile communication system) (3rd Generation, 3G), both be called as IMT-2000 (International Mobile Telecommunications in the year 2000), the universal mobile telecommunications system of being called (Universal Mobile Telecommunications System is also arranged, be called for short " UMTS "), it can combine voice communication and multimedia communication, and its possible value-added service will comprise image, music, web page browsing, video conference and some other information service.3G means the standard that the whole world is suitable for, novel business, bigger coverage rate and more frequency spectrum resource, to support more users.
Except multimedia communication, INTERNET insert, the another one attraction of 3G system is the mutual maneuverability of the height of itself and 2G system.Wherein, Wideband Code Division Multiple Access (WCDMA) (Wideband Code DivisionMultiple Access is called for short " WCDMA ") has extremely strong compatibility.3G can provide similar platform, makes operator only need to increase some software and hardwares on network and can make existing GSM upgrade to WCDMA, and therefore existing 2G user can carry out the transition to 3G naturally.
Though in the long run, the 3G system replaces the 2G system and is inevitable,, the 2G system still has very long life cycle.The 2G network is through long-term construction and optimization on the one hand, and it covers quite complete and perfect performance.On the other hand, because the mutual maneuverability of height of 3G system and 2G system, the 2G system will create repayment in the market part of valuing speech for a long time.
The purpose that the different system of WCDMA is switched is exactly to wish to utilize the generally covering of existing 2G network, switches to gsm system by the WCDMA system when being necessary, so that continuous network service to be provided.
At present, the mode that switches to gsm system from the WCDMA system roughly is divided into four steps: measure control, measurement report, switch decision and switch and carry out.
As seen, at first need the GSM signal is measured.Mainly comprise following steps:
1) carries out GSM carrier frequency received signal field intensity indication (Receiving Signal Strength Indicator is called for short " RSSI ") and measure (GSM carrier RSSI measurement), the i.e. measurement of GSM signal strength signal intensity;
2) carry out GSM initial base station identification code (Base Station Identify Code, be called for short " BSIC ") confirm that (GSM Initial BSIC identification) and GSM BSIC heavily confirm (GSM BSICre-confirmation), which sub-district clear and definite GSM signal belongs to.
In the isosystem measurement report,, then report RSSI value and sub-district ID if the BSIC of this GSM sub-district is successfully decoded; If BSIC does not have decoded, then report RSSI value and GSM frequency point number.
Except some double-receiver, for most subscriber equipment (User Equipment, be called for short " UE "), 3 kinds of measurements carrying out said GSM carrier RSSI measurement, GSM Initial BSICidentification, GSM BSIC re-confirmation all need to start compact model.
Compact model is a kind of mechanism that produces certain idle periods (GAP) in the WCDMA radio frames, and UE can carry out between frequency or the measurement of intersystem cell by these idle periods.It is pointed out that a GAP phase, can only do a kind of measurement, therefore, the measurement of each purpose all needs a compressed mode pattern sequence, and the GAP between each sequence can not have overlapping.Measure for said GSM, carry out 3 kinds of measurements altogether of GSM carrier RSSI measurement, GSM Initial BSIC identification and GSM BSIC re-confirmation respectively with regard to needing 3 compressed mode pattern sequences.Above-mentioned 3 compressed mode pattern sequences must strengthen transmitting power transmission data at the non-GAP time slot of condensed frame in order to obtain to measure required GAP.Therefore along with the increase of GAP quantity, influence will become big to compact model to systematic function.
Existing different system compresses pattern method of measurement is a parallel starting GSM carrier RSSImeasurement, these 3 kinds compressed mode sequence of measuring purpose of GSM Initial BSIC identification and GSM BSIC re-confirmation, article 3, the GAP position of parallel sequence and the transmission space between them begin Connection Frame Number (Transmission Gap Connection Frame Number, abbreviation " TGCFN ") relativity shift is fixed, transmission space pattern length (Transmission Gap PatternLength, be called for short " TGPL ") equate, thus, can guarantee that the GAP of 3 parallel sequences can be not overlapping.
In actual applications, there is following problem in such scheme: at first, because 3 compressed mode sequence of measuring purpose need improve transmitting power greatly, cause systematic function to receive considerable influence.Need to improve transmitting power during the compact model, this may reduce power system capacity.If all need the isosystem measurement of pressing mold to start 3 parallelly compressed mode sequences at the very start, the GAP of 3 sequences power ascension that needs of adding up is bigger, and this certainly will cause bigger impact to systematic function.
Secondly, the startup that also needs that does not reach threshold requirement for RSSI is measured, and expense is big, causes efficiency of measurement low.In other words, be not that each isosystem measurement startup can both measure the GSM sub-district that satisfies condition, when RSSI did not meet the demands, the BSIC decoding was nonsensical.So, each isosystem measurement starts GSM carrier RSSI measurement, GSM Initial BSICidentification and these 3 kinds measurements of GSM BSIC re-confirmation and compact model thereof when not adding differentiation expense is very big, and its efficiency of measurement is obviously not high.
At last, also needs are finished 3 kinds of measurements under can be according to the situation of RSSI that reports and the unique definite Target cell of GSM frequency point number, cause flexibility not enough, waste system resource.This is because gsm system has certain frequency reuse distance, the only corresponding GSM sub-district of GSM adjacent area next frequency of most applications of WCDMA cell configuration, even therefore this moment, BSIC did not confirm, only reported RSSI and GSM frequency point number, RNC also can be according to the Target cell of the unique definite switching of Neighboring Cell List.So be not that the switching of each different system all needs 3 kinds of all measurements of GSM to finish, algorithm according to circumstances flexible configuration is measured.Existing scheme does not obviously possess this flexibility.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of switching method of mobile communication network different system, make the compact model of more flexibly, effectively controlling different system measure, improve efficiency of measurement, can guarantee the correct switching from 3G to 2G, compact model is measured system is caused the little influence of trying one's best.
For achieving the above object, the invention provides a kind of switching method of mobile communication network different system, when subscriber equipment from first mobile system when second mobile system switches, comprise following steps:
The described subscriber equipment of A network side elder generation startup is measured the compact model of described second mobile system received signal field intensity indication described received signal field intensity indication is measured, and judge that the received signal field intensity that records indicates whether to satisfy handoff threshold, if then enter step C, if do not satisfy handoff threshold then stop isosystem measurement, perhaps keep subscriber equipment to the measurement of described received signal field intensity indication up to satisfying handoff threshold;
C starts the initial base station identification code and confirms compact model and identification of base stations code weight affirmation compact model, and judges whether obtaining of described base station identity code be successful, switches if then initiate different system.
Wherein, described first mobile system is a broadband CDMA system, and described second mobile system is a global system for mobile communications.
In addition, described method also comprises following steps B, wherein, and in the described steps A, when judging that the indication of received signal field intensity enters step B when satisfying handoff threshold;
The described network side of B obtains the frequency point information of the described second mobile system sub-district from the measurement result of the compact model of described measurement received signal field intensity indication, and judge whether can be according to this frequency point information and pre-configured network planning information, unique definite Target cell in the second mobile system sub-district adjacent with sub-district, described subscriber equipment place, switch if then initiate different system, otherwise enter described step C to this Target cell.
In addition, described method also comprised following steps before steps A:
Described network side judges whether that according to UE capability needs start compact model and measure, if then issue 3 compressed mode sequence parameters and enter steps A to subscriber equipment, otherwise directly issue the isosystem measurement control command, and whether carry out the switching of different system according to the measurement report decision of returning to described subscriber equipment.
In addition, described compressed mode sequence parameter issues by physical channel reconfigure command or radio bearer reconfigure command.
In addition, in the described method, when stopping isosystem measurement, needs comprise following steps:
D1 judges whether to have used compact model, if then carry out D2 and D3, otherwise directly discharges isosystem measurement;
D2 judges whether to be in received signal field intensity indication premeasuring state, if then sending measuring control discharges isosystem measurement, and the compressed mode sequence of deexcitation received signal field intensity indication measurement;
D3 judges whether to have started base station identity code and confirm to measure, if, the compressed mode sequence of global system for mobile communications that deexcitation is useful on measurement when discharging isosystem measurement then.
By relatively can finding, the main distinction of technical scheme of the present invention and prior art is, on the one hand, start a compressed mode sequence earlier, the RSSI of GSM is measured and judges, satisfy at RSSI under the situation of handoff threshold, carry out other follow-up works again; On the other hand, by the frequency point number information of judging that the front obtains in the rssi measurement to GSM, determining whether can unique thus definite Target cell, under can the situation of unique definite Target cell, directly initiating different system to Target cell switches, if not all right, then activating again and measuring purpose is the two other compressed mode sequence of GSM Initial BSIC identification and GSM BSICre-confirmation.
Difference on this technical scheme, brought comparatively significantly beneficial effect, by in advance RSSI being measured and judging, avoided under RSSI does not satisfy the situation of handoff threshold, starting simultaneously that 3 compact models carry out that GSM measures and the problem that causes systematic function is caused greater impact has improved efficiency of measurement simultaneously; In addition, whether can unique definite Target cell by judging the frequency point information that obtains in the rssi measurement to GSM, avoided under can the situation of unique definite Target cell by frequency point information, other 2 compact models of insignificant startup, more flexible.
Description of drawings
Fig. 1 is the different-system switching method schematic flow sheet according to first embodiment of the invention;
Fig. 2 is the different-system switching method schematic flow sheet according to second embodiment of the invention;
Fig. 3 is the schematic diagram that stops isosystem measurement among the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Generally speaking, the present invention has improved the different system compresses pattern (CompressedMode of prior art, be called for short " CM ", adopted different system to switch CM premeasuring method, specifically, at first only start a CM sequence during system implementation of the present invention the RSSI of GSM is carried out premeasuring, just judge whether when RSSI satisfies handoff threshold that up to measuring needs start the CM sequence that two other is used to confirm BSIC, promptly start GSM Initial BSIC identification (hereinafter being called " initial BSIC confirms ") and GSM BSIC re-confirmation (hereinafter being called " GSM BSIC heavily confirms ").If not needing to confirm BSIC can then directly initiate different system and switch according to the unique definite Target cell of frequency point number.
Below in conjunction with Fig. 1, the first embodiment of the present invention is described in detail.
As shown in Figure 1, the measurement of present embodiment, switch decision flow process are as follows:
At first in step 200, the isosystem measurement of this enforcement starts.Promptly start isosystem measurement when UE reports 2D incident or other reason, need to prove that the 2D incident is a report, the quality estimated value of the frequency of promptly having used is lower than a certain thresholding.
Next, in step 210, when UE from WCDMA when GSM switches, network side judges whether that according to the UE ability needs start CM and measure, if then turn to subsequent step 220, if do not need, then forwards step 211 to.Need to prove, here network side according to the UE ability judge whether to start CM, specifically, if UE is the double-receiver mobile phone, and the GSM frequency range that will measure is during for 1800M, just belonging to does not need to start compact model and just carries out the situation that GSM measures.If UE does not possess under the situation of double-receiver condition, must support CM, so that carry out measurement to another carrier frequency.
When in step 210, judge that not needing to start compact model measures, then in step 211, directly issue the isosystem measurement control command to UE, and BSIC acknowledgement indicator (BSICVerification) is set to essential (Required), just carry out the switch decision assessment then, promptly whether carry out different system and switch according to the measurement report decision of returning according to measurement report.
And when in step 210, judging needs to start CM, then carries out follow-up step 220, compresses pre-configuredly, promptly issues 3 CM sequential parameters and enters step 230 to subscriber equipment.Specifically, carry out the pre-configured physical channel that comprises of CM and reshuffle, or radio bearer (Radio Bearer, be called for short " RB ") reconfigure command all is handed down to UE with 3 CM sequential parameters that GSM measures, at this moment only issue parameter, do not activate CM.
And then step 240 judges whether RSSI satisfies handoff threshold, if then enter step 250, ends otherwise withdraw from switching flow.Whether this step is actually the pre-judgement that radio network controller (Radio NetworkController is called for short " RNC ") carries out according to the different system rssi measurement report of receiving, need BSIC to confirm with decision.In this step, if the rssi measurement value does not reach thresholding, then keep rssi measurement up to satisfying condition or isosystem measurement is stopped.Thus, when not having enough good GSM sub-district to be used to switch, can avoid two compressed mode sequence of free burial ground for the destitute startup BSIC affirmation unintentionally, avoid of influence and the impact of insignificant compact model neatly system.
When in step 240, when judging RSSI and reaching thresholding, then enter step 250, start initial BSIC and confirm that CM and BSIC heavily confirm CM.In other words, this step is that GSM measures latter two part in 3 parts, the initial BSIC of GSM confirms that (GSM Initial BSIC identification) and GSM BSIC heavily confirm (GSM BSIC re-confirmation), these two affirmations as the sub-district colour coding are with the cell id of determining to be surveyed.
Enter step 260 subsequently, carry out switch decision assessment, the switch decision condition that satisfies herein is specially measured value and reaches handoff threshold always, and surpasses the delay triggered time of appointment, then is initiated to this GSM sub-district and switches.If judgment condition does not satisfy, then stop isosystem measurement.What also want special summary description here is, this step satisfy different system switching judging condition, in fact following 3 kinds of measurement reports can both enter the switch decision assessment, comprise that isosystem measurement does not need the measurement report of CM; Cut the measurement report that does not need BSIC to confirm by the pre-judgement of RSSI, carried out the measurement report that BSIC confirms.RNC carries out handover evaluation according to the measurement report result that receives is parallel, if measured value reaches handoff threshold always, and surpasses delay triggered time of appointment, then initiates different system and switches.In this enforcement, the switch decision condition of step 260, if along step 211, its measurement report belongs to the measurement report that isosystem measurement does not need CM; If along step 250, then measurement report belongs to the measurement report that has carried out the BSIC affirmation.
At last, the switch decision condition satisfies in step 260, and then in step 270, system initiates different system to this Target cell to be switched.
Below in conjunction with Fig. 2, illustrate that different-system switching method according to a second embodiment of the present invention is described in detail.
As shown in Figure 2, the measurement of present embodiment, switch decision flow process are as follows:
At first in step 300, the isosystem measurement of this enforcement starts.
Next, in step 310, when UE from WCDMA when GSM switches, network side judges whether that according to the UE ability needs start CM and measure, if then turn to subsequent step 320, if do not need, then forwards step 311 to.
When in step 310, judge that not needing to start compact model measures, then in step 311, directly issue the isosystem measurement control command to UE, and BSIC acknowledgement indicator (BSICVerification) is set to essential (Required), just carry out the switch decision assessment then, promptly whether carry out different system and switch according to the measurement report decision of returning according to measurement report.
And when in step 310, judging needs to start CM, then carries out follow-up step 320, compresses pre-configuredly, promptly issues 3 CM sequential parameters and enters step 330 to subscriber equipment.
Step 330 subsequently, network side starts the CM of UE measure GSM RSSI.Detailed content of this step and the step 230 of aforementioned first embodiment are in full accord.
And then step 340 judges whether RSSI satisfies handoff threshold, if then enter step 350, ends otherwise withdraw from switching flow.Whether this step is actually the pre-judgement that radio network controller (Radio NetworkController is called for short " RNC ") carries out according to the different system rssi measurement report of receiving, need BSIC to confirm with decision.In this step, if the rssi measurement value does not reach thresholding, then keep rssi measurement up to satisfying condition or isosystem measurement is stopped.Thus, when not having enough good GSM sub-district to be used to switch, present embodiment can be avoided two compressed mode sequence of free burial ground for the destitute startup BSIC affirmation unintentionally equally, has avoided influence and the impact of insignificant compact model to system neatly.
When judging that in step 340 RSSI satisfies handoff threshold, then be determined further, in step 350, need to judge whether BISC to confirm.Specifically, network side obtains the frequency point information of GSM sub-district from the measurement result of the CM of measure R SSI, and judge whether can be according to this frequency point information and pre-configured network planning information, unique definite Target cell in the GSM sub-district adjacent with sub-district, subscriber equipment place, if, directly forward step 370 to, otherwise forward step 360 to.In this step, by judging that the frequency point information that obtains in the rssi measurement to GSM whether can unique definite Target cell, avoided under promptly can the situation of unique definite Target cell by frequency point information, other 2 compact models of insignificant startup, as seen this step makes handoff procedure more flexible.
When in step 350, judging needs BISC to confirm, then carry out step 360, starts initial BSIC and confirms that compact model and BSIC heavily confirm compact model.In other words, if in step 350, according to the adjacent sub-district of can not the be unique definite GSM of GSM frequency point information, issue again then that BSIC Verification Requried is set to Required in the isosystem measurement control cell interRAT Measurement Quantity; And activating and measuring purpose is the two other CM sequence of GSM Initial BSIC identification, GSM BSICre-confirmation.
In step 370 subsequently, carry out switch decision assessment, the switch decision condition that satisfies herein is specially measured value and reaches handoff threshold always, and surpasses the delay triggered time of appointment, then is initiated to this GSM sub-district and switches.Here need to prove, if along the flow process of step 360, herein satisfy the whether success of obtaining that the switch decision condition is specially BSIC, be then to initiate different system to switch, otherwise end to switch.If the flow process along step 350 directly enters the switch decision assessment, the switch decision condition that satisfies herein was specially in the delay triggered time, and RSSI remains on more than the handoff threshold always, then is initiated to this GSM sub-district and switches.If the judgment condition of coming along two steps does not satisfy, then stop isosystem measurement.What also want special summary description here is, this step satisfy different system switching judging condition, in fact following 3 kinds of measurement reports can both enter the switch decision assessment, comprise that isosystem measurement does not need the measurement report of CM; Cut the measurement report that does not need BSIC to confirm by the pre-judgement of RSSI; Carried out the measurement report that BSIC confirms.RNC carries out handover evaluation according to the measurement report result that receives is parallel, if measured value reaches handoff threshold always, and surpasses delay triggered time of appointment, then initiates different system and switches.In this enforcement, the switch decision condition of step 370, if along step 311, its measurement report belongs to the measurement report that isosystem measurement does not need CM; If along step 350, then measurement report belongs to by the pre-judgement of RSSI and cuts the measurement report that does not need BSIC to confirm.If along step 360, then measurement report belongs to the measurement report of adjudicating and having carried out the BSIC affirmation by RSSI in advance.
At last, in step 380, system initiates different system to this Target cell to be switched.
In addition, in the present embodiment, when receiving the 2F incident, when perhaps other reason need stop isosystem measurement, carry out to carry out different processing to being in different phase, the situation of ending is analyzed, need to prove here below in conjunction with Fig. 3,2F is just report also, and the quality estimated value of the frequency of promptly having used is higher than a certain thresholding.
As shown in Figure 3, Fig. 3 is actually on the basis of Fig. 2, and expression stops the simplification schematic flow sheet of isosystem measurement, and the dotted line among the figure between step has represented to skip a lot of less important relatively steps.
At first,, judge whether to have used CM,, otherwise enter step 401, directly discharge isosystem measurement if then enter step 410 in step 400;
Next, in step 410, if stop when judging whether to be in the rssi measurement state, if then enter step 411, sending measuring control discharges isosystem measurement, and the CM sequence of deexcitation rssi measurement, otherwise enters step 420;
At last, in step 420, judge whether to have started BSIC and confirm to measure, if then enter the step 421 CM sequence that GSM that deexcitation is useful on measures when discharging isosystem measurement.Otherwise just finish.
Though by with reference to some preferred embodiment of the present invention, the present invention is illustrated and describes, those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (6)
1. a switching method of mobile communication network different system is characterized in that, when subscriber equipment from first mobile system when second mobile system switches, comprise following steps:
The described subscriber equipment of A network side elder generation startup is measured the compact model of described second mobile system received signal field intensity indication described received signal field intensity indication is measured, and judge that the received signal field intensity that records indicates whether to satisfy handoff threshold, if then enter step C, if do not satisfy handoff threshold then stop isosystem measurement, perhaps keep subscriber equipment to the measurement of described received signal field intensity indication up to satisfying handoff threshold;
C starts the initial base station identification code and confirms compact model and identification of base stations code weight affirmation compact model, and judges whether obtaining of described base station identity code be successful, switches if then initiate different system.
2. switching method of mobile communication network different system according to claim 1 is characterized in that, described first mobile system is a broadband CDMA system, and described second mobile system is a global system for mobile communications.
3. switching method of mobile communication network different system according to claim 2 is characterized in that described method also comprises following steps B, wherein, and in the described steps A, when judging that the indication of received signal field intensity enters step B when satisfying handoff threshold;
The described network side of B obtains the frequency point information of the described second mobile system sub-district from the measurement result of the compact model of described measurement received signal field intensity indication, and judge whether can be according to this frequency point information and pre-configured network planning information, unique definite Target cell in the second mobile system sub-district adjacent with sub-district, described subscriber equipment place, switch if then initiate different system, otherwise enter described step C to this Target cell.
4. switching method of mobile communication network different system according to claim 2 is characterized in that, described method also comprised following steps before steps A:
Described network side judges whether that according to UE capability needs start compact model and measure, if then issue 3 compressed mode sequence parameters and enter steps A to subscriber equipment, otherwise directly issue the isosystem measurement control command, and whether carry out the switching of different system according to the measurement report decision of returning to described subscriber equipment.
5. switching method of mobile communication network different system according to claim 4 is characterized in that, described compressed mode sequence parameter issues by physical channel reconfigure command or radio bearer reconfigure command.
6. switching method of mobile communication network different system according to claim 2 is characterized in that, in the described method, comprises following steps when needs stop isosystem measurement:
D1 judges whether to have used compact model, if then carry out D2 and D3, otherwise directly discharges isosystem measurement;
D2 judges whether to be in received signal field intensity indication premeasuring state, if then sending measuring control discharges isosystem measurement, and the compressed mode sequence of deexcitation received signal field intensity indication measurement;
D3 judges whether to have started base station identity code and confirm to measure, if, the compressed mode sequence of global system for mobile communications that deexcitation is useful on measurement when discharging isosystem measurement then.
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| CN101267665B (en) * | 2007-03-12 | 2011-07-13 | 中兴通讯股份有限公司 | Method for basic switch from TDCDMA to other networks under HLR amalgamation mode |
| CN101370226B (en) * | 2007-08-17 | 2012-08-08 | 华为技术有限公司 | Method and customer equipment for measuring and reading control signal channel |
| US8892094B2 (en) * | 2010-06-15 | 2014-11-18 | Telefonaktiebolaget L M Ericsson (Publ) | Cell search and measurement in heterogeneous networks |
| WO2012022050A1 (en) * | 2010-08-20 | 2012-02-23 | 中兴通讯股份有限公司 | Method for controlling compressed mode and system thereof |
| EP2512195B1 (en) * | 2011-04-12 | 2014-07-16 | ST-Ericsson SA | Measurement gaps triggering for a multi SIM mobile device |
| CN103634825B (en) * | 2012-08-27 | 2016-12-07 | 中国移动通信集团四川有限公司 | A kind of cell telephone traffic equalization methods, determine the method and system of handoff threshold |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1104974A2 (en) * | 1999-11-13 | 2001-06-06 | Hyundai Electronics Industries Co., Ltd. | Mobile telecommunication system and method for performing handoff between asynchronous base station and synchronous base station |
| CN1394018A (en) * | 2001-06-27 | 2003-01-29 | 华为技术有限公司 | Method for controlling compression mode according to power of mobile station |
| CN1464664A (en) * | 2002-06-11 | 2003-12-31 | 华为技术有限公司 | Method for deciding starting time of compression mode in different system measurement of CDMA system |
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