CN102137455B - Different-system switching method and terminal equipment - Google Patents
Different-system switching method and terminal equipment Download PDFInfo
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- CN102137455B CN102137455B CN201010101271.8A CN201010101271A CN102137455B CN 102137455 B CN102137455 B CN 102137455B CN 201010101271 A CN201010101271 A CN 201010101271A CN 102137455 B CN102137455 B CN 102137455B
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Abstract
The invention relates to the field of communication, and discloses a different-system switching method and terminal equipment. In the invention, when a terminal measures that signal strength of a current cell becomes weak, the terminal performs repeated measurement on the signal strength of the current cell at a preset time interval to obtain N measurement data of the signal strength of the current cell. If the N pieces of measurement data do not meet a logarithmic decrement relationship, the subsequent different-system switching process is forbidden. The ping-pong handover problem caused by the actual performance and the actual usage status of a terminal antenna, such as the change of the rotation angle of the terminal and the like can be effectively solved.
Description
Technical field
The present invention relates to the communications field, the different systematic evaluation technology particularly in the communications field.
Background technology
In third generation partner program (3rd Generation Partnership Project is called for short " 3GPP "), " pingpang handoff " this term refers to the cell merge of the cell merge frequently doing homologous ray that terminal is unnecessary or different system.For TD-SCDMA/GSM dual-mode terminal, pingpang handoff mainly refers to and frequently to switch between TD-SCDMA and GSM two systems.The appearance of pingpang handoff can increase the signaling processing load of system on the one hand, reduces power system capacity; The quality of service of terminal can be reduced on the other hand, increase the power consumption of terminal.
3GPP to the basic demand switched is, when terminal place cell signal is deteriorated, terminal needs to find the good homologous ray of signal or different system cell, and switches in the past, to ensure quality of service.Under normal circumstances, when TD-SCDMA/GSM dual-mode terminal moves, due to from current cell base station distance more and more away from, thus path loss increases, worse and worse, dual-mode terminal needs to measure different system cell signal cell signal, if find, different system cell signal is better, be then switched to different system.Such as, dual-mode terminal is current to be resided on TD-SCDMA community, when terminal moves to cell edge, finds that current TD-SCDMA cell signal is deteriorated, then starts to measure GSM cell signal, there is the good community of GSM signal be just switched to GSM if find.The switching of different system also can be the United States Patent (USP) of " 5737703 " see the patent No..
The basic process of current different systematic evaluation is, when finding that the signal of current system is weaker than certain threshold value and after continuing for some time, just starts to measure different system signal, if find, different system signal is better than certain threshold value, be then switched to different system.In theory, if terminal is motionless, then the distance between terminal and base station is constant, thus this cell signal that terminal receives is invariable, and terminal can not do different systematic evaluation forever.Only when fast mobile terminal, the distance of terminal and base station becomes large, and the cell signal that terminal receives is deteriorated, and terminal just can do different systematic evaluation.
But the present inventor finds, in practical situations both, because terminal antenna can not accomplish desirable omnidirectional, there is directivity, that is for different signal incident directions, the signal strength signal intensity that terminal receives is different.In actual use, due to the position of the hand held terminal of user and the angle difference of terminal rotating, even if all can cause when terminal is motionless, the signal that terminal receives is more big changes.And current different systematic evaluation scheme can not judge this situation.That is, when the anglec of rotation of terminal changes, Received signal strength dies down, and terminal is just likely switched to another system.When the anglec of rotation of terminal changes again, Received signal strength recovers, and terminal will be returned from another systematic evaluation.Thus create pingpang handoff.
Summary of the invention
The object of the present invention is to provide a kind of different-system switching method and terminal equipment, solve the pingpang handoff problem because terminal rotating Angulation changes etc. causes due to terminal antenna actual performance and actual service condition.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of different-system switching method, comprise following steps:
When the signal strength signal intensity that terminal measures current area dies down, according to the time interval of presetting the signal strength signal intensity of current area carried out to the duplicate measurements of at least 3 times, obtain the measurement data of N number of current cell signal strength;
If N number of measurement data does not meet logarithmic decrease relation, then terminal disables carries out follow-up different net system switching process.
Embodiments of the present invention additionally provide a kind of terminal equipment, comprise:
Measuring unit, for measuring the signal strength signal intensity of current area, measuring unit, when the signal strength signal intensity measuring current area dies down, to carry out the duplicate measurements of at least 3 times, obtains the measurement data of N number of current cell signal strength to the signal strength signal intensity of current area according to the time interval of presetting;
Judging unit, for the N number of measurement data obtained according to measuring unit, judges whether N number of measurement data meets logarithmic decrease relation;
Switch unit, for controlling different net system switching process;
Judging unit is when judging that N number of measurement data does not meet logarithmic decrease relation, and instruction switch unit is forbidden carrying out follow-up different net system switching process.
Compared with prior art, the main distinction and effect thereof are embodiment of the present invention:
When the signal strength signal intensity that terminal measures current area dies down, the time interval according to presetting carries out repeatedly duplicate measurements to the signal strength signal intensity of current area, obtains the measurement data of N number of current cell signal strength.If N number of measurement data does not meet logarithmic decrease relation, then forbid carrying out follow-up different net system switching process.Due to the increase along with transmission range, will meet logarithmic relationship between path loss and transmission range, for the measurement of terminal, path loss increases the cell signal that how much terminal will be made to measure and weakens how many.If the terminal received signals caused due to terminal antenna actual performance and actual service condition (as terminal rotating Angulation changes etc.) dies down, then the size that Received signal strength dies down obviously can not meet logarithmic relationship.Therefore, when judging that the multiple measurement data measured do not meet logarithmic decrease relation, forbid carrying out follow-up different net system switching process, effectively can solve the pingpang handoff problem because terminal rotating Angulation changes etc. causes due to terminal antenna actual performance and actual service condition, thus improve terminal capabilities, reduce power consumption of terminal.
Further, the value of N is set to 4, that is, needs the measurement data obtaining 4 current cell signal strength.Due to according to Statistics, need more than 3 sampled points could obtain the correct statistical conclusions whether meeting logarithmic decrease relation, too much sampling number then can cause terminal wait overlong time.Therefore, being 4 can while guarantee accuracy by value, avoiding the terminal that too much causes due to the sampling number problem of overlong time for measuring.
Further, the default time interval is set to 1 second.If due to measure interval too small, then former and later two measurement data may not have enough differences under normal circumstances, thus cause judge by accident possibility, and if measurement interval excessive, then can cause terminal wait overlong time, affect response speed.Therefore, when reaching 5km/h according to the speed of walking of normal condition servant, mobile phone signal namely during 1.4m/s, just can be caused to have comparatively high attenuation at short notice.So the default time interval is set to 1 second, namely now more than 1m can be differed between two sampled points under normal circumstances, decay difference now between two sampled points has enough differences, erroneous judgement can be avoided, be unlikely to again to make terminal wait overlong time, accuracy and efficiency reach good compromise.
Further, if N number of measurement data meets logarithmic decrease relation, then start to carry out different net system switching process.Due to measurement data meet logarithmic decrease relation time, illustrate that terminal is due to more and more far away from current cell base station distance, thus path loss increase, cause cell signal worse and worse.Therefore in this case, continue to use prior art, namely start to carry out different net system switching process.The present invention is made to be compatible with in prior art completely.
Accompanying drawing explanation
Fig. 1 is the different-system switching method flow chart according to first embodiment of the invention;
Fig. 2 is according to the relation schematic diagram between the free space path loss in first embodiment of the invention and transmission range;
Fig. 3 is the terminal equipment structural representation according to third embodiment of the invention.
Embodiment
In the following description, many ins and outs are proposed in order to make reader understand the application better.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on the many variations of following execution mode and amendment, also can realize each claim of the application technical scheme required for protection.
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.
First embodiment of the invention relates to a kind of different-system switching method.In the present embodiment, terminal is TD-SCDMA/GSM dual-mode terminal, and idiographic flow as shown in Figure 1.
In step 110, whether the signal strength signal intensity of community, place that terminal judges measures dies down.If died down, then enter step 120, otherwise direct process ends.Specifically, when terminal completes the measurement of current cell signal strength, by pre-test with it to signal strength signal intensity compare, draw the conclusion whether signal strength signal intensity dies down, if it is determined that signal strength signal intensity dies down, then enter step 120, otherwise direct process ends.
Then, in the step 120, terminal to carry out the duplicate measurements of at least 3 times according to the time interval of presetting to the signal strength signal intensity of current area, obtain the measurement data of N number of current cell signal strength.Such as, terminal carries out the duplicate measurements of 3 times according to the time interval of presetting (also can be described as and measure interval) to the signal strength signal intensity of current area, then comprise the measurement of the signal strength signal intensity in step 110,4 measurement results can be obtained altogether, the measurement data of 4 current cell signal strength can be obtained.Or the duplicate measurements that terminal to be carried out 4 times or more time the signal strength signal intensity of current area according to the time interval of presetting, obtains N measurement result, i.e. the measurement data of the signal strength signal intensity of N number of current area altogether.
Then, in step 130, whether the N number of measurement data of terminal judges meets logarithmic decrease relation.Specifically, owing to specifying according to 3GPP, for TD-SCDMA/GSM dual-mode terminal, during when current system signal weaker and lower than certain thresholding, terminal must measure another system signal intensity, if when another system signal intensity is better than certain threshold value, then terminal is switched to another system from current system.Ideally, when only having fast mobile terminal, the signal of the current area that terminal measures just can die down.And when fast mobile terminal, distance between terminal and base station becomes large, thus path loss strengthens, and the base station signal of incoming terminal just dies down, and the embodiment in terminal is exactly that the cell signal that measures of terminal dies down.For free space, the pass between path loss PL and transmission range is:
Wherein, d is the space propagation distance of signal between base station and terminal, and λ is the wavelength of space propagation signal, G
tand G
rthe gain of antenna for base station and terminal antenna respectively, λ, G
t, G
rall can think constant, thus the relation between path loss and transmission range can be expressed as:
Wherein
represent constant.For free space, constant C is generally-38.46.Be not difficult to find, the relation between free space path loss and transmission range as shown in Figure 2.Obviously along with the increase of transmission range, meet logarithmic relationship between path loss and transmission range, for the measurement of terminal, path loss increases the cell signal that how much terminal will be made to measure and weakens how many.
As can be seen here, die down for the terminal received signals caused due to terminal antenna actual performance and actual service condition by terminal rotating Angulation changes etc., the size that Received signal strength dies down obviously can not meet logarithmic relationship.Therefore, in this step, by judging whether N number of measurement data meets logarithmic decrease relation, can judge Received signal strength that present terminal is measured die down be due to terminal normally movement cause, or to cause due to other reasons (as terminal rotating Angulation changes).
If N number of measurement data does not meet logarithmic decrease relation, then illustrate it is that the terminal received signals caused due to terminal antenna actual performance and actual service condition (as terminal rotating Angulation changes) dies down, therefore enter step 140, forbid carrying out follow-up different net system switching process.
If N number of measurement data meets logarithmic decrease relation, then illustrate really due to terminal normally movement to cause and the terminal received signals caused dies down, therefore enter step 150, start to carry out follow-up different net system switching process, namely still continue to use existing technology to process, do not repeat them here.
Be not difficult to find, in the present embodiment, the terminal received signals caused due to terminal antenna actual performance and actual service condition because of terminal rotating Angulation changes etc. is utilized to die down, the size that Received signal strength dies down can not meet logarithmic relationship this point, by judging whether N number of measurement data meets logarithmic decrease relation, determine whether carry out follow-up different net system switching process, effectively can solve the pingpang handoff problem because terminal rotating Angulation changes etc. causes due to terminal antenna actual performance and actual service condition, thus improve terminal capabilities, reduce power consumption of terminal.
And, when N number of measurement data meets logarithmic decrease relation, continue to use prior art, namely start to carry out different net system switching process, the present invention can be made to be compatible with in prior art completely.
In addition, it is worth mentioning that, terminal is support the dual-mode terminal of TD SDMA TD-SCDMA and global system for mobile communications GSM two kinds of standards.But in actual applications, terminal in present embodiment also can be support bimodulus (or multimode) terminal of other any two kinds of (or multiple) standards, adopt similar method, judge Received signal strength that present terminal is measured die down be due to terminal normally movement cause, or to cause due to other reasons (as terminal rotating Angulation changes).This is no longer going to repeat them.
Second embodiment of the invention relates to a kind of different-system switching method.Second execution mode improves on the basis of the first execution mode, and main improvements are: the value of N is specially 4, namely needs the measurement data obtaining 4 current cell signal strength.And the default time interval is specifically set to 1s.That is, when terminal measure current cell signal die down time, then measure the signal strength signal intensity of current area every 1 second, measure 3 times altogether, comprise the measurement data that the measured value started most obtains 4 current cell signal strength altogether.
Due to according to Statistics, need more than 3 sampled points could obtain the correct statistical conclusions whether meeting logarithmic decrease relation, too much sampling number then can cause terminal wait overlong time.Therefore, being 4 can while guarantee accuracy by value, avoiding the terminal that too much causes due to the sampling number problem of overlong time for measuring.Similarly, if measure interval too small, then former and later two measurement data may not have enough differences under normal circumstances, thus cause judge by accident possibility, and if measurement interval excessive, then can cause terminal wait overlong time, affect response speed.Therefore, when reaching 5km/h according to the speed of walking of normal condition servant, mobile phone signal namely during 1.4m/s, just can be caused to have comparatively high attenuation at short notice.So the default time interval is set to 1 second, namely now more than 1m can be differed between two sampled points under normal circumstances, decay difference now between two sampled points has enough differences, erroneous judgement can be avoided, be unlikely to again to make terminal wait overlong time, accuracy and efficiency reach good compromise.
In addition, be appreciated that measuring intervals of TIME is set to 1s just to be considered for the compromise of accuracy and efficiency.In actual applications, also measuring intervals of TIME can be set to 1.5s, 2s etc.N also can be taken as other arbitrary values being greater than 4, such as according to the time interval of presetting the signal strength signal intensity of current area carried out to the duplicate measurements of 5 times, so comprise the measured value started most and obtain 6 measurement data altogether, now N is 6.
Each method execution mode of the present invention all can realize in modes such as software, hardware, firmwares.No matter the present invention realizes with software, hardware or firmware mode, instruction code can be stored in the addressable memory of computer of any type (such as permanent or revisable, volatibility or non-volatile, solid-state or non-solid, fixing or removable medium etc.).Equally, memory can be such as programmable logic array (Programmable Array Logic, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), read-only memory (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc, be called for short " DVD ") etc.
Third embodiment of the invention relates to a kind of terminal equipment.As shown in Figure 3, this terminal equipment comprises:
Measuring unit, for measuring the signal strength signal intensity of current area, measuring unit, when the signal strength signal intensity measuring current area dies down, to carry out the duplicate measurements of at least 3 times, obtains the measurement data of N number of current cell signal strength to the signal strength signal intensity of current area according to the time interval of presetting.
Judging unit, for the N number of measurement data obtained according to measuring unit, judges whether N number of measurement data meets logarithmic decrease relation.
Switch unit, for controlling different net system switching process.
Judging unit is when judging that N number of measurement data does not meet logarithmic decrease relation, and instruction switch unit is forbidden carrying out follow-up different net system switching process.
Judging unit is when judging that N number of measurement data meets logarithmic decrease relation, and instruction switch unit starts to carry out different net system switching process.
Terminal equipment in present embodiment can be the dual-mode terminal supporting TD SDMA TD-SCDMA and global system for mobile communications GSM two kinds of standards.
Be not difficult to find, the first execution mode is the method execution mode corresponding with present embodiment, and present embodiment can be worked in coordination with the first execution mode and be implemented.The relevant technical details mentioned in first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the first execution mode.
Four embodiment of the invention relates to a kind of terminal equipment.4th execution mode improves on the basis of the 3rd execution mode, and main improvements are: the value of N is specially 4, namely needs the measurement data obtaining 4 current cell signal strength.And the default time interval is specifically set to 1s.
Be not difficult to find, the second execution mode is the method execution mode corresponding with present embodiment, and present embodiment can be worked in coordination with the second execution mode and be implemented.The relevant technical details mentioned in second execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the second execution mode.
It should be noted that, the each unit mentioned in the present invention's each equipment execution mode is all logical block, physically, a logical block can be a physical location, also can be a part for a physical location, can also realize with the combination of multiple physical location, the Physical realization of these logical blocks itself is not most important, and the combination of the function that these logical blocks realize is the key just solving technical problem proposed by the invention.In addition, in order to outstanding innovative part of the present invention, the unit not too close with solving technical problem relation proposed by the invention is not introduced by the above-mentioned each equipment execution mode of the present invention, and this does not show that the said equipment execution mode does not exist other unit.
Although by referring to some of the preferred embodiment of the invention, to invention has been diagram and describing, but those of ordinary skill in the art should be understood that and can do various change to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. a different-system switching method, is characterized in that, comprises following steps:
When the signal strength signal intensity that terminal measures current area dies down, according to the time interval of presetting the signal strength signal intensity of current area carried out to the duplicate measurements of at least 3 times, obtain the measurement data of N number of current cell signal strength, N is more than or equal to 4;
If described N number of measurement data does not meet logarithmic decrease relation, then described terminal disables carries out follow-up different net system switching process.
2. different-system switching method according to claim 1, is characterized in that, the value of described N is 4.
3. different-system switching method according to claim 1, is characterized in that, the described default time interval is 1 second.
4. different-system switching method according to claim 1, is characterized in that, after the measurement data obtaining described N number of current cell signal strength, also comprises following steps:
If described N number of measurement data meets logarithmic decrease relation, then start to carry out different net system switching process.
5. different-system switching method according to claim 1, is characterized in that, described terminal is support the dual-mode terminal of TD SDMA TD-SCDMA and global system for mobile communications GSM two kinds of standards.
6. a terminal equipment, is characterized in that, comprises:
Measuring unit, for measuring the signal strength signal intensity of current area, described measuring unit is when the signal strength signal intensity measuring current area dies down, according to the time interval of presetting the signal strength signal intensity of current area carried out to the duplicate measurements of at least 3 times, obtain the measurement data of N number of current cell signal strength, N is more than or equal to 4;
Judging unit, for the described N number of measurement data obtained according to described measuring unit, judges whether described N number of measurement data meets logarithmic decrease relation;
Switch unit, for controlling different net system switching process;
Described judging unit, when judging that described N number of measurement data does not meet logarithmic decrease relation, indicates described switch unit to forbid carrying out follow-up different net system switching process.
7. terminal equipment according to claim 6, is characterized in that, the value of described N is 4.
8. terminal equipment according to claim 6, is characterized in that, the described default time interval is 1 second.
9. terminal equipment according to claim 6, is characterized in that, described judging unit, when judging that described N number of measurement data meets logarithmic decrease relation, indicates described switch unit to start to carry out different net system switching process.
10. terminal equipment according to claim 6, is characterized in that, described terminal equipment is the dual-mode terminal supporting TD SDMA TD-SCDMA and global system for mobile communications GSM two kinds of standards.
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| CN103249102B (en) * | 2012-02-06 | 2016-08-10 | 中国移动通信集团广东有限公司 | A kind of different systems method for handover control and network equipment |
| CN103313335B (en) * | 2013-06-05 | 2015-11-18 | 天翼电信终端有限公司 | Double module terminal device network mode switching method and double module terminal device |
| CN106385698B (en) * | 2015-07-31 | 2020-01-10 | 展讯通信（上海）有限公司 | Mobile terminal cell switching control method and device |
| CN106412985B (en) * | 2015-07-31 | 2019-12-31 | 展讯通信（上海）有限公司 | Mobile terminal cell switching control method and device |
| CN105873143A (en) * | 2016-05-26 | 2016-08-17 | 努比亚技术有限公司 | Network switching device and method |
| WO2019095158A1 (en) * | 2017-11-15 | 2019-05-23 | Oppo广东移动通信有限公司 | Radio communication method and device |
| CN108834190B (en) * | 2018-09-26 | 2020-12-01 | 广东小天才科技有限公司 | Weak network power consumption optimization method and intelligent terminal |
| CN112218347B (en) * | 2020-09-27 | 2022-09-16 | Oppo广东移动通信有限公司 | Method and device for inhibiting inter-system ping-pong, terminal equipment and storage medium |
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| US20070115883A1 (en) * | 2003-07-14 | 2007-05-24 | Matsushita Electric Industrial Co., Ltd. | Method for reducing hand-off latency in mobile networks |
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| US5737703A (en) * | 1994-12-23 | 1998-04-07 | Nokia Mobile Phones Limited | Multi-mode radio telephone which executes handover between different system |
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Effective date of registration: 20161118 Address after: 361015 Xiamen Fujian torch hi tech Zone Pioneering Park Cheng Yip Building Room 201 Patentee after: Xiamen Ziguang exhibition Rui Technology Co. Ltd. Address before: 201203 Shanghai city Zuchongzhi road Pudong Zhangjiang hi tech park, Spreadtrum Center Building 1, Lane 2288 Patentee before: Zhanxun Communication (Shanghai) Co., Ltd. |