CN101784074A - Method for estimating distance between user equipment and base station - Google Patents
Method for estimating distance between user equipment and base station Download PDFInfo
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- CN101784074A CN101784074A CN200910076698A CN200910076698A CN101784074A CN 101784074 A CN101784074 A CN 101784074A CN 200910076698 A CN200910076698 A CN 200910076698A CN 200910076698 A CN200910076698 A CN 200910076698A CN 101784074 A CN101784074 A CN 101784074A
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Abstract
The method discloses a method for estimating the distance between user equipment (UE) and a base station, comprising the following steps: a radio network controller (RNC) determines the signal to interference ratio S1 and S2 when the distance between the UE and the base station is respectively d1 and d2; when the target value of the signal to interference ratio figured out by the RNC in a presupposed time t1 is always less than S1, determining the distance between the UE and the base station less than d1 by the RNC; and when the target value of the signal to interference ratio figured out by the RNC in a presupposed time t1 is always larger than S1, determining the distance between the UE and the base station larger than d2 by the RNC. In the invention, congruent relationship of the signal to interference ratio and the distance between the UE and the base station, the distance of the UE relative to the base station is estimated, thus improving the accuracy that a system utilizes the estimation result thereof to control strategic decision.
Description
Technical field
The present invention relates to estimate in the mobile communication system technology of subscriber equipment (UE) position, particularly relate to the method for distance between estimation UE and the base station.
Background technology
In existing mobile communication system, UE usually is the important evidence that system carries out the radio resourse management optimization decision-making with respect to the distance of base station.
For example, in soft frequency coverage handoff technique (TFFR), the central area of residential quarter and fringe region use respectively half to cover carrier wave and all standing carrier wave, and at central area and fringe region intersection, system need to consider to carry out the switching between above-mentioned two kinds of carrier waves.In theory, central area and fringe region can be divided by a line of demarcation, but in the practical application, because the complexity of application scenarios, system marks off one usually and switches band between central area and fringe region, in switching band, system will be thought of as the switching that UE carries out carrier wave.Whether for this reason, system need to determine earlier UE with respect to the distance of base station, and then determine UE based on this distance and be in and switch in the band, is in when switching band with convenient UE, according to the handover trigger mechanism of system, for this UE makes corresponding handover decisions.
Present TD-SCDMA system mainly is that received signal code power (RSCP) value of the Primary Common Pilot Channel (PCCPCH) by measuring main carrier is estimated the distance of UE with respect to the base station.
And the TD-SCDMA system is a multicarrier system, user's business may be carried on the auxilliary carrier wave, because wireless channel is for the selectivity of different frequency, main carrier can be different with auxilliary carrier wave RSCP value separately, the radio resourse management optimization decision-making that the estimation result who makes system obtain according to the RSCP value of the PCCPCH that utilizes main carrier has done (as the sub-district switch, the location of UE etc.), will have error inevitably.
This shows, because the difference of major-minor carrier wave utilizes the method for distance between existing estimation UE and the base station to carry out control decision, will cause the control decision result to have error.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of estimating distance between subscriber equipment and the base station, and this method can the raising system utilize its estimation result to carry out the accuracy that radio resourse management optimization is made a strategic decision.
In order to achieve the above object, the technical scheme of the present invention's proposition is:
A kind of method of estimating distance between subscriber equipment and the base station may further comprise the steps:
Radio network controller (RNC) determines that the distance of UE and base station is d
1The time signal interference ratio S
1, and the distance of UE and base station is d
2The time signal interference ratio S
2
The signal interference ratio desired value that calculates in time at default t1 as RNC is all the time less than S
1The time, then the distance between RNC judgement UE and the base station is less than d
1
The signal interference ratio desired value that calculates in time at default t2 as RNC is all the time greater than S
2The time, then the distance between RNC judgement UE and the base station is greater than d
2
Preferably, described d
1For switching the internal diameter of band, described d among the TFFR
2For switching the external diameter of band among the TFFR.
In sum, a kind of method of estimating distance between UE and the base station that the present invention proposes, by utilizing the corresponding relation of the distance between signal interference ratio and UE and the base station, the current distance with respect to the base station of UE is estimated, can the raising system utilize it to estimate the accuracy that the result carries out control decision.
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 the accompanying drawings and the specific embodiments.
Existing TD-SCDMA system has adopted exterior ring power control (OLPC) mechanism, as UE during gradually away from the base station, because path loss becomes big gradually, the interference level of its adjacent area raises gradually, in order to keep original signal quality, network side can increase signal interference ratio desired value (SIR TARGET) gradually, so that offset the rising of interference level.Therefore, the signal interference ratio desired value can reflect the distance relation between UE and the base station.
Based on this, main thought of the present invention is: consider that the signal interference ratio desired value not only can reflect that the distance between UE and the base station is far and near, and it is irrelevant with the difference of main and auxiliary carrier wave, the present invention utilizes the signal interference ratio desired value that the distance between UE and the base station is estimated, when effectively avoiding utilizing RSCP to estimate, owing to be subjected to the differentia influence of main and auxiliary carrier wave, and cause estimating the inaccuracy of the control decision that the result makes based on this.Particularly, RNC by measuring, determines UE with respect to the distance of base station and the corresponding relation of signal interference ratio in advance, utilize then this corresponding relation and ought be for the previous period in the SIRTARGET value, estimate the distance between current UE and the base station.
Embodiments of the invention one mainly may further comprise the steps:
RNC determines that the distance of UE and base station is d
1The time signal interference ratio S
1, and the distance of UE and base station is d
2The time signal interference ratio S
2
The signal interference ratio desired value that calculates in time at default t1 as RNC is all the time less than S
1The time, then the distance between RNC judgement UE and the base station is less than d
1
Concrete, when RNC judges that the current signal interference ratio desired value of UE is less than S
1The time, then start timer, after this, if arrived t1 before the time in the value of timer, the signal interference ratio desired value is less than S
1, then stop timer, if arrived t1 before the time in the value of timer, the signal interference ratio desired value that calculates is all the time less than S
1, judge that then distance between UE and the base station is less than d
1
The signal interference ratio desired value that calculates in time at default t2 as RNC is all the time greater than S
2The time, then the distance between RNC judgement UE and the base station is greater than d
2
Concrete, when RNC judges that the current signal interference ratio desired value of UE is greater than S
2The time, then start timer, after this, if arrived t2 before the time in the value of timer, the signal interference ratio desired value is less than S
2, then stop timer, if arrived t2 before the time in the value of timer, the signal interference ratio desired value that calculates is all the time greater than S
2, judge that then distance between UE and the base station is greater than d
2
In actual applications, technique scheme can be applied to many needs to be determined in the scene of UE position, such as the location of UE, residential quarter switching etc.
In the time of in the present invention is applied to the handoff procedure of soft frequency coverage handoff technique, described d
1For switching the internal diameter of band, described d among the TFFR
2For switching the external diameter of band among the TFFR.Like this, RNC can determine the current location of UE, and then can be according to the handover trigger mechanism of current location according to the residential quarter, for this UE makes corresponding handover decisions.
This shows, the present invention is applied in the control decision of switching the residential quarter that can effectively avoid existing TFFR method to utilize RSCP to determine whether when switching, the difference of main and auxiliary carrier wave is to the impact of handover decisions, thus the accuracy that raising is switched.
The foregoing description one is an example with the application scenarios of handover decisions, the present invention is described in detail, but the invention is not restricted under this application scenarios, for example, the present invention can also combine with antenna technology in the location scene that is applied to UE, because concrete grammar is similar, does not repeat them here.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. a method of estimating distance between user equipment (UE) and the base station is characterized in that, this method may further comprise the steps:
Radio network controller (RNC) determines that the distance of UE and base station is d
1The time signal interference ratio S
1, and the distance of UE and base station is d
2The time signal interference ratio S
2
The signal interference ratio desired value that calculates in time at default t1 as RNC is all the time less than S
1The time, then the distance between RNC judgement UE and the base station is less than d
1
The signal interference ratio desired value that calculates in time at default t2 as RNC is all the time greater than S
2The time, then the distance between RNC judgement UE and the base station is greater than d
2
2. method according to claim 1 is characterized in that, described d
1For soft frequency covers the internal diameter that switches band among the changing method TFFR, described d
2For switching the external diameter of band among the TFFR.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910076698A CN101784074A (en) | 2009-01-15 | 2009-01-15 | Method for estimating distance between user equipment and base station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910076698A CN101784074A (en) | 2009-01-15 | 2009-01-15 | Method for estimating distance between user equipment and base station |
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|---|---|
| CN101784074A true CN101784074A (en) | 2010-07-21 |
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| CN200910076698A Pending CN101784074A (en) | 2009-01-15 | 2009-01-15 | Method for estimating distance between user equipment and base station |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102573048A (en) * | 2010-12-15 | 2012-07-11 | 中国移动通信集团设计院有限公司 | Method, system and device for locating mobile terminal |
| CN112929812A (en) * | 2021-01-23 | 2021-06-08 | 东莞理工学院 | Indoor positioning method considering Bluetooth co-frequency interference |
-
2009
- 2009-01-15 CN CN200910076698A patent/CN101784074A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102573048A (en) * | 2010-12-15 | 2012-07-11 | 中国移动通信集团设计院有限公司 | Method, system and device for locating mobile terminal |
| CN102573048B (en) * | 2010-12-15 | 2014-09-10 | 中国移动通信集团设计院有限公司 | Method, system and device for locating mobile terminal |
| CN112929812A (en) * | 2021-01-23 | 2021-06-08 | 东莞理工学院 | Indoor positioning method considering Bluetooth co-frequency interference |
| CN112929812B (en) * | 2021-01-23 | 2022-07-29 | 东莞理工学院 | Indoor positioning method considering Bluetooth co-frequency interference |
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Application publication date: 20100721 |