CN1964212A - A method to compensate estimated error of path loss in TD-SCDMA system - Google Patents
A method to compensate estimated error of path loss in TD-SCDMA system Download PDFInfo
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- CN1964212A CN1964212A CNA2006101617292A CN200610161729A CN1964212A CN 1964212 A CN1964212 A CN 1964212A CN A2006101617292 A CNA2006101617292 A CN A2006101617292A CN 200610161729 A CN200610161729 A CN 200610161729A CN 1964212 A CN1964212 A CN 1964212A
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Abstract
The disclosed error estimation method for compensation path loss in TD-SCDMA system comprises: A. BS calculated path loss estimation error according to received mobile terminal emission signal power and desired power, and sends error information to mobile terminal; and B. the terminal compensates current path loss according to received error. This invention can increase path loss estimation precision even for very weak signal.
Description
Technical field
The present invention relates to the technology of accurate path loss in time division multiplexing-S-CDMA (TD-SCDMA) system, particularly the method for compensating for path loss evaluated error in the TD-SCDMA system.
Background technology
In the TD-SCDMA system, path loss is a very important measured value, and it is used for the size of power control control mobile terminal emitting power, the places such as processing of portable terminal emission time initial lead in the uplink synchronous.Obviously, the precision of path loss estimation directly has influence on the performance of whole system.
In the prior art, the basic process that path loss is estimated is: the base station transmits with constant power in whole sub-district, and transmission power level is broadcasted in whole sub-district with the upper strata means of signaling simultaneously.Portable terminal is after receiving base station signal, at first estimate the signal strength signal intensity that the mobile terminal antenna mouth receives, solve top signaling then, obtain the transmission power level of base station this moment, deduct the signal strength signal intensity that antenna opening receives with the base station transmitting power value that solves, promptly obtain the path loss of space transmission between base station and portable terminal.
As seen, the estimation of path loss is that intensity by correct estimating received signal calculates in the TD-SCDMA system.The estimation of received signal intensity is by received signal being decomposed into in-phase component I signal and quadrature component Q signal, calculates that the quadratic sum of I signal and Q signal obtains.Under weak signal conditions, that is to say that when received signal intensity is near sensitivity-108dBm the signal to noise ratio of received signal is at 0dB or below the 0dB, promptly the signal intensity ratio noise intensity that receives of mobile terminal antenna mouth is little, is submerged under the noise fully.The received signal intensity reflects that calculate with said method this moment be the size of noise, rather than the size of the signal that receives of mobile terminal antenna mouth, thus cause the estimation of path loss error to occur.
Summary of the invention
In view of this, a main purpose of the present invention is to provide the method for compensating for path loss evaluated error in a kind of TD-SCDMA system, this method can improve the precision that path loss is estimated under the situation a little less than portable terminal receives signal strength signal intensity in the TD-SCDMA system.
Main thought of the present invention is to utilize the evaluated error of base station calculating path loss, passes to portable terminal with under the evaluated error then, and the evaluated error that used for mobile terminal is received compensates its error of under weak signal conditions path loss being estimated.Concrete steps of the present invention are as follows:
A, base station are according to the expectation power of base station sets and receive the evaluated error that received power that portable terminal sends signal calculates path loss, send to portable terminal;
B, portable terminal compensate the error of the path loss that self calculates according to the evaluated error that receives.
The upward signal that the described portable terminal of steps A transmits and sends by uplink pilot time slot UpPTS into portable terminal, the transmitted power of this upward signal are the path loss of portable terminal estimation and the expectation power sum of base station.
The described evaluated error of steps A is: the base station receives expectation power poor that portable terminal sends the received power of signal and base station.
The described process that evaluated error is sent to portable terminal of steps A is: the physical access channel FPACH signal that will carry evaluated error sends to portable terminal, wherein, and the reservation bit bit representation evaluated error in the burst structure of FPACH signal.
Described steps A is carried out with Fixed Time Interval;
The different evaluated error of the described evaluated error that receives of step B for receiving with Fixed Time Interval;
Further comprise before the current path loss that the described compensation of step B calculates self: the evaluated error that portable terminal is used to compensate with the condition selection of setting.
In the said method, the condition of described setting is:
B1, judge whether portable terminal has preserved evaluated error, if the evaluated error that then will preserve selects to be used for compensation; Otherwise, execution in step B2;
B2, portable terminal judge whether the evaluated error that receives is 0: if then continue to receive evaluated error; Otherwise, the evaluated error that receives is kept in the portable terminal, select to be used for compensation.
Described Fixed Time Interval is 5ms.
The error of the current path loss that described compensation calculates self is: when each portable terminal detects received signal less than set point, read the evaluated error that portable terminal is preserved, be used for the error that the compensating for path loss is estimated.
The error that described compensating for path loss is estimated is: the current path loss that calculates with portable terminal deducts the evaluated error of its preservation.
As seen, the method of compensating for path loss evaluated error under the weak signal conditions in the TD-SCDMA provided by the invention system, solved in the TD-SCDMA system under the weak situation of portable terminal received signal, the accurate problem of estimating path loss has improved the estimated accuracy of path loss.
In addition, the present invention comes the evaluated error of transfer path loss by the bit that keeps among the FPACH, and the bit of this reservation generally all is not utilized in the prior art, has the waste of resource.The present invention has then not only effectively utilized signal transmission resource, and little to the TD-SCDMA protocol modification, implements more convenient.
Description of drawings
Fig. 1 is the method flow diagram of embodiment of the invention compensating for path loss evaluated error.
Embodiment
The present invention is further described in more detail below in conjunction with specific embodiments and the drawings.
The present invention proposes a kind of in the TD-SCDMA system method of compensating for path loss evaluated error, specific implementation is to utilize under the evaluated error of base station with the path loss that calculates to pass to portable terminal, the evaluated error that used for mobile terminal receives compensates its error of under weak signal conditions path loss being estimated, improves estimated accuracy.Evaluated error can transmit by the reservation bit position in the FPACH signal burst structure.Described FPACH signal burst structure comprises 32bit, and it is that reservation bit does not use that 9bit is wherein arranged.
The method of compensating for path loss evaluated error of the present invention as shown in Figure 1, wherein, the path loss that portable terminal is estimated is counted P1, actual path loss is counted P2, the expectation power of base station is counted P, the expectation power of base station is set up on their own by the base station, and the form with broadcasting is notified portable terminal in the sub-district.This method specifically may further comprise the steps:
Step 101: portable terminal sends upward signal by the UpPTS time slot of each TD-SCDMA subframe to the base station, and the transmitting power of this upward signal is that portable terminal utilizes the path loss of prior art estimation and the expectation power sum of base station, promptly
Transmitting power=the P1+P of UpPTS time slot upward signal.
Step 101 is prior aries, and this upward signal is that portable terminal sends, and the content of uncertain this upward signal of present embodiment is only determined its transmitted power.
Step 102: the evaluated error of portable terminal to path loss calculated in the base station, and evaluated error is the poor of the base station expectation power of receiving the received power of UpPTS time slot upward signal and base station, that is:
Path loss=the P1+P-P2 of the transmitting power-reality of the received power of UpPTS time slot upward signal=UpPTS time slot upward signal
Evaluated error=(P1+P-P2)-P=P1-P2
Because in the step 101, when portable terminal sends upward signal, might be in the situation of received signal greater than noise, the path loss that this moment, portable terminal was estimated is actual path loss, do not have evaluated error, so the evaluated error that step 102 calculates might be 0.
Step 103: the base station sends FPACH signal, the evaluated error that the reservation bit bit representation in this FPACH signal burst structure calculates to portable terminal.
Because in the prior art, the burst structure of FPACH signal has the reservation position of 9bit, and the present invention just can utilize the reservation position of this 9bit to carry the evaluated error that calculates.
Step 101～103 repeated at interval with regular time, and this time interval is the subframe lengths of TD-SCDMA, i.e. 5ms.
Step 104: the evaluated error of the path loss that portable terminal obtains carrying from the FPACH signal of receiving compensates in order to receive at portable terminal under the more weak situation of signal strength signal intensity.
Before the evaluated error compensation that obtains with portable terminal, the embodiment of the invention is also carried out following process:
At first judge whether preserved fixed error in the portable terminal, this fixed error can be kept in the fixed memory (NV) of portable terminal:
If then the fixed error of preserving is used to compensate receive under the more weak situation of signal strength signal intensity and carries out process ends at portable terminal;
If not, judge then whether the fixed error that obtains is 0, if then return step 104, continue to receive and to carry the FPACH signal of evaluated error, and then determine whether this evaluated error can be used for receiving under the more weak situation of signal strength signal intensity at portable terminal and compensate; Otherwise, the fixed error of receiving is kept in the portable terminal, among the NV as portable terminal, be used for receiving under the more weak situation of signal strength signal intensity and compensate at portable terminal.
The embodiment of the invention judge the fixed error obtain whether be 0 be because: if be 0, be in the situation of received signal with regard to portable terminal in the description of step 101 greater than noise, the path loss that this moment, portable terminal was estimated is actual path loss, and the evaluated error that step 102 obtains is 0; If be not 0, be in the situation of received signal with regard to portable terminal in the description of step 101 less than noise, the path loss that this moment, portable terminal was estimated is not actual path loss, evaluated error has appearred, so the evaluated error that calculates in step 102 is not 0, thereby just the embodiment of the invention will be for receiving the evaluated error that compensates under the more weak situation of signal strength signal intensity at portable terminal.
Receiving the process that compensates under the more weak situation of signal strength signal intensity at portable terminal and be specially in the step 104:
After portable terminal had been preserved evaluated error, portable terminal detected in real time to the signal that receives from the base station.When portable terminal detects the signal of reception less than set point, as less than-100dBm the time, the taking-up mobile terminal stores, evaluated error as the NV of portable terminal storage, the path loss of the signal of the reception of estimating with portable terminal deducts evaluated error, compensates the error that portable terminal is estimated path loss with this.That is:
P1-(P1-P2)＝P2
Path loss after the compensation is actual path loss, has so just improved the precision that portable terminal is estimated path loss.
Present embodiment adopts the reservation bit position of FPACH signal burst structure to carry evaluated error, needs to revise agreement, and original untapped 9bit reservation bit is used, and is used to represent the evaluated error of path loss.The present invention also can adopt other signals to represent evaluated error, passes to portable terminal down, reaches same goal of the invention.In the present embodiment, being used to judge that the set point whether portable terminal is in weak signal conditions is unfixed, is not one to be decided to be-100dBm.
As seen, the method for the present invention's compensating for path loss evaluated error under weak signal conditions can effectively improve in the TD-SCDMA system estimated accuracy of path loss under the weak signal conditions.
Claims (9)
1, the method for compensating for path loss evaluated error in a kind of time division multiplexing-S-CDMA TD-SCDMA system is characterized in that the concrete steps of this method are:
A, base station are according to the expectation power of base station sets and receive the evaluated error that received power that portable terminal sends signal calculates path loss, send to portable terminal;
B, portable terminal compensate the error of the path loss that self calculates according to the evaluated error that receives.
2, method according to claim 1, it is characterized in that, the upward signal that the described portable terminal of steps A transmits and sends by uplink pilot time slot UpPTS into portable terminal, the transmitted power of this upward signal are the path loss of portable terminal estimation and the expectation power sum of base station.
3, method according to claim 1 is characterized in that, the described evaluated error of steps A is: the base station receives expectation power poor that portable terminal sends the received power of signal and base station.
4, method according to claim 1, it is characterized in that, the described process that evaluated error is sent to portable terminal of steps A is: the physical access channel FPACH signal that will carry evaluated error sends to portable terminal, wherein, the reservation bit bit representation evaluated error in the burst structure of described FPACH signal.
5, method according to claim 1 is characterized in that, described steps A is carried out with Fixed Time Interval;
The different evaluated error of the described evaluated error that receives of step B for receiving with Fixed Time Interval;
Further comprise before the current path loss that the described compensation of step B calculates self: the evaluated error that portable terminal is used to compensate with the condition selection of setting.
6, method according to claim 5 is characterized in that, the condition of described setting is:
B1, judge whether portable terminal has preserved evaluated error, if the evaluated error that then will preserve selects to be used for compensation; Otherwise, execution in step B2;
B2, portable terminal judge whether the evaluated error that receives is 0: if then continue to receive evaluated error; Otherwise, the evaluated error that receives is kept in the portable terminal, select to be used for compensation.
7, method according to claim 5 is characterized in that, described Fixed Time Interval is 5ms.
8, according to claim 1,5 or 6 described methods, it is characterized in that, the error of the current path loss that described compensation calculates self is: when each portable terminal detects received signal less than set point, read the evaluated error that portable terminal is preserved, be used for the error that the compensating for path loss is estimated.
9, method according to claim 8 is characterized in that, the error that described compensating for path loss is estimated is: the current path loss that calculates with portable terminal deducts the evaluated error of its preservation.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006101617292A CN1964212A (en) | 2006-12-13 | 2006-12-13 | A method to compensate estimated error of path loss in TD-SCDMA system |
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| CNA2006101617292A CN1964212A (en) | 2006-12-13 | 2006-12-13 | A method to compensate estimated error of path loss in TD-SCDMA system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101778465A (en) * | 2010-03-09 | 2010-07-14 | 山东大学 | Error estimation based proportion power control method in CDMA (Code Division Multiple Access) cellular system |
| CN101340215B (en) * | 2007-07-04 | 2012-07-25 | 鼎桥通信技术有限公司 | Method and device for determining transmitting power of special burst sub-frame |
| WO2013104341A1 (en) * | 2012-01-13 | 2013-07-18 | 华为技术有限公司 | Method for locating mobile terminal, and location server and server base station therefor |
| US8843172B2 (en) | 2009-06-30 | 2014-09-23 | Zte Corporation | Method and base station for determining an initial transmission power |
| CN103345205B (en) * | 2013-05-21 | 2015-07-15 | 国家电网公司 | Data verification-based AGC load optimizing controlling method |
| CN105306149A (en) * | 2014-06-24 | 2016-02-03 | 中兴通讯股份有限公司 | Path loss calculating and compensating device and method |
| CN111490938A (en) * | 2018-02-05 | 2020-08-04 | 联发科技股份有限公司 | Communication link checking method |
-
2006
- 2006-12-13 CN CNA2006101617292A patent/CN1964212A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101340215B (en) * | 2007-07-04 | 2012-07-25 | 鼎桥通信技术有限公司 | Method and device for determining transmitting power of special burst sub-frame |
| US8843172B2 (en) | 2009-06-30 | 2014-09-23 | Zte Corporation | Method and base station for determining an initial transmission power |
| CN101938773B (en) * | 2009-06-30 | 2014-11-05 | 中兴通讯股份有限公司 | Initial transmitting power acquisition method and base station |
| CN101778465A (en) * | 2010-03-09 | 2010-07-14 | 山东大学 | Error estimation based proportion power control method in CDMA (Code Division Multiple Access) cellular system |
| CN101778465B (en) * | 2010-03-09 | 2012-07-11 | 山东大学 | Error estimation based proportion power control method in CDMA (Code Division Multiple Access) cellular system |
| WO2013104341A1 (en) * | 2012-01-13 | 2013-07-18 | 华为技术有限公司 | Method for locating mobile terminal, and location server and server base station therefor |
| CN103345205B (en) * | 2013-05-21 | 2015-07-15 | 国家电网公司 | Data verification-based AGC load optimizing controlling method |
| CN105306149A (en) * | 2014-06-24 | 2016-02-03 | 中兴通讯股份有限公司 | Path loss calculating and compensating device and method |
| CN111490938A (en) * | 2018-02-05 | 2020-08-04 | 联发科技股份有限公司 | Communication link checking method |
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Application publication date: 20070516 |