CN100413374C - Metering reporting method for loop time of radio link - Google Patents
Metering reporting method for loop time of radio link Download PDFInfo
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- CN100413374C CN100413374C CNB2005100710571A CN200510071057A CN100413374C CN 100413374 C CN100413374 C CN 100413374C CN B2005100710571 A CNB2005100710571 A CN B2005100710571A CN 200510071057 A CN200510071057 A CN 200510071057A CN 100413374 C CN100413374 C CN 100413374C
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Abstract
The invention relates to a metering reporting method for round trip time (RTT) of radio links, which has a step A that a wireless network controller sends RTT measurement information to a base station, a step B that the base station searches the current multi-path information to find out the minimum phase multi-path with the energy exceeding the set threshold value and then to calculate RTT value, a step C that the base station determines whether the RTT measurement period is completed or not, if not, the procedure transfers to the steps B, otherwise, a steps D is implemented. The step D is to calculate the average value of all calculated RTT values and the average value is used as the RTT measurement value of the RTT measurement period and reported to the report them to the wireless network controller. RTT measurement value obtained by the present invention is more close to actual wireless application environment, so that the positioning accuracy of the system is further raised.
Description
Technical field
The present invention relates to wireless communication field, the winding time that relates in particular to a kind of Radio Link, (Round TripTime RTT) measured report method.
Background technology
3GPP has mainly defined the location technology of three kinds of wireless terminals in network, wherein a kind of localization method that is based on CellId (cell ID), in order to improve locating accuracy, for FDD (FrequencyDivision Duplex, frequency division multiplexing) pattern also can be measured to the RTT that NodeB (base station) initiates Radio Link by radio network controller (RNC).
As shown in Figure 1, for adopting UE (User Equipment, subscriber equipment) location schematic diagram based on CellId+RTT.Wherein, elliptic region is the coverage of sub-district, and the black blockage is the position of NodeB, the UE position ring that dotted line is determined for RTT information.If only know CellId information, positioning UE is the coverage of sub-district, i.e. elliptic region so; If known RTT information, can positioning UE be that dotted line and elliptic region intersect a belt strip, i.e. arc between intersection point A and the B among Fig. 1 then.This shows, adopt RTT to measure, can orient the current location of UE more accurately, improve the positional accuracy of system.
3GPP is defined as RTT:
RTT＝T
RX-T
TX
Wherein, T
TXFinger sends to the beginning delivery time of descending DPCH (Dedicated Physical Channel, the DPCH) frame of UE, and reference point is the transmitting antenna mouth, T
RXRefer to corresponding up DPCCH/DPDCH (Dedicated Physical Control Channel from UE, Dedicated Physical Control Channel/Dedicated Physical Data Channel, Dedicated Physical Data Channel) frame the beginning time of reception, reference point is the reception antenna mouth.
In the actual environment, because the existence of factors such as reflection, diffraction, produced the communication effect of multipath, in the WCDMA system, adopt code word to carry out user's differentiation, so these multipath information can be used, with decline to antinoise signal, in actual process, effective multipath information of obtaining is many more, then can improve the anti fading ability.Therefore, when uplink demodulation was handled, the base station need be searched for, and obtained multipath information, in order to instruct demodulation.In search multipath method, a kind of method of guiding and supporting is arranged, its basic principle is exactly that when antenna diversity received, if on an antenna multipath information is arranged, thinking so also should have multipath information on the identical position of another antenna; The multipath that is each antenna can be guided and supported mutually, and like this, non-guide and support footpath of multipath information except receiving also comprises the footpath of guiding and supporting of guiding and supporting out mutually, might be empty footpath and guide and support the footpath, therefore, might comprise empty footpath information in the multipath information that the base station obtains.
According to the definition of agreement, what adopted when calculating RTT in the existing technology is the multipath of phase place minimum in the multipath information, and concrete computational methods comprise the steps: as shown in Figure 2
Step S11, RNC issue RTT to the base station and measure message;
Step S12, base station obtain the multipath information of a frame signal correspondence;
Step S13, calculate the RTT value of the minimum multipath of phase place;
Step S14, if RTT does not arrive the finish time measuring period, then go to step S12, continue the measurement of next frame signal; If arrive in measuring period, execution in step S15;
Step S15, ask for the mean value of a plurality of RTT values that calculate in this measuring period;
Step S16, the mean value of trying to achieve is reported RNC, be used for assist location;
Step S17, finish this RTT and measure flow process.
In above-mentioned RTT method of measurement, in the multipath information of a possible frame signal correspondence, the multipath of phase place minimum is empty footpath, and adopts the empty RTT that directly calculates inaccurate, when being used for assist location, can make the result of location bigger deviation occur.
Summary of the invention
The winding time (RTT) that the invention provides a kind of Radio Link is measured report method, calculates RTT in order to solve the empty footpath of the employing that exists in the prior art, influences the problem of accurate positioning.
The inventive method comprises the following steps:
A, radio network controller issue RTT to the base station and measure message;
The multipath information of B, base station search present frame finds out energy greater than the minimum multipath of the phase place of setting the energy threshold value, and calculates its RTT value;
C, base station judge that whether RTT arrives measuring period, if not, goes to step B; Otherwise, execution in step D;
The mean value of the whole RTT values that calculate is asked in D, base station, reports radio network controller as the RTT measured value of this RTT measuring period.
According to said method of the present invention, also include the base station and count RTT comprises the signal frame number of described multipath in measuring period step, if the signal frame number that comprises described multipath is greater than the signal frame threshold value of setting, then the base station thinks that the RTT measured value that reports is effective, otherwise the RTT measured value of this measuring period is invalid.
The described RTT of counting comprises described multipath in measuring period signal frame number adopts counter to realize.
Described base station adopts counters count to go out described signal frame number, and concrete grammar is:
Starting RTT moment measuring period, described counter is put 0;
If comprise described multipath in the multipath information of present frame, then make described counter add 1;
When RTT arrived measuring period, the currency of described counter was this RTT comprises described multipath in measuring period signal frame number.
Described counter is arranged in the base station.
A kind of winding time RTT of Radio Link measures report method, comprises the following steps:
A, radio network controller issue RTT to the base station and measure message;
The multipath information of B, base station search present frame finds out energy greater than the minimum multipath of the phase place of setting the energy threshold value, and calculates its RTT value;
C, base station go to step B if judge also no show RTT measuring period; The base station is if judge that RTT arrives measuring period, judge further that then whether RTT comprises the signal frame number of described multipath greater than the signal frame threshold value of setting in measuring period, if greater than then carrying out step D, otherwise, abandon the whole RTT values that calculate in this cycle, reporting to radio network controller temporarily to provide effective measured value information;
The mean value of the whole RTT values that calculate is asked in D, base station, reports radio network controller as the RTT measured value of this RTT measuring period.
Beneficial effect of the present invention is as follows:
1, the inventive method is from the multipath information that search is come out, calculate the RTT value with energy greater than the minimum multipath of the phase place of setting the energy threshold value, the RTT value is calculated in the empty footpath of having avoided existing in the prior art of employing, therefore, adopts result of calculation of the present invention to make the location more accurate;
2, the multipath information that can come out according to search of the energy threshold value in the inventive method and the size of correlation energy are set or are adjusted, and are used for the multipath that RTT calculates to optimize;
3, the present invention carries out the validity judgement for the RTT value that calculates, do not reach certain quantity if comprise energy in the measuring period greater than the signal frame number of setting the threshold value multipath, then do not adopt the measured value in this measuring period, the accuracy of the RTT value that further assurance is used to locate.
Description of drawings
Fig. 1 carries out UE location schematic diagram for adopting cell ID and RTT measurement;
Fig. 2 measures flow chart for prior art RTT;
Fig. 3 measures flow chart for RTT of the present invention.
Embodiment
When the minimum multipath of the present invention's phase place in available technology adopting multipath information carries out RTT calculating, might adopt empty footpath to calculate, thereby cause the inaccurate problem of result of calculation, in the multipath information that search is come out, only select for use energy to carry out RTT and calculate greater than the minimum multipath of the phase place of setting the energy threshold value.Concrete grammar is: calculate the energy of every the multipath that searches, and respectively with the energy threshold value of a setting relatively, filter out energy greater than the multipath of setting thresholding; The phase place of the whole multipaths that relatively filter out again, the multipath of choosing the phase place minimum carries out RTT and calculates.In order further to guarantee the validity of RTT measured value, can set the signal frame threshold value that comprises described multipath in the measuring period, will not adopt less than the RTT measured value that reports the measuring period of threshold value for frame number, have only frame number just to be used for the location greater than the RTT measured value that reports the measuring period of threshold value.
As shown in Figure 3, be the flow chart of the specific embodiment of the invention, in this embodiment, adopt a counter that is arranged on the base station to come the signal frame number that comprises described multipath is added up, concrete steps are as follows:
Step S21, RNC issue RTT to the base station and measure message;
Step S22, make the counter reset;
Step S23, base station obtain the multipath information of a frame signal correspondence;
Step S24, base station judge whether energy greater than the multipath of setting the energy threshold value, if, execution in step S25; Otherwise, go to step S27;
Step S25, calculate the RTT value of the minimum multipath of phase place, continuation the following step;
Step S26, make counter add " 1 ", continue the following step;
Step S27, base station judge whether RTT arrives the finish time measuring period, if not, then goes to step S23, continue the measurement of next frame signal; If arrive in measuring period, continue step S28;
Step S28, judge counter value whether greater than the signal frame threshold value of setting, if not, execution in step S29; If, execution in step S30;
Step S29, abandon all RTT values that calculate in this measuring period, reporting to radio network controller temporarily to provide effective measured value information; Execution in step S31;
Step S30, ask for the mean value of the whole RTT values that calculate, report radio network controller as the RTT measured value of this measuring period; Execution in step S31;
Step S31, finish this RTT and measure flow process.
Describe as can be known according to said method of the present invention, the present invention is relative, and prior art has following advantages:
1, the inventive method is from the multipath information that search is come out, with energy greater than setting the energy threshold value The minimum multipath of phase place calculates the RTT value, and the RTT value is calculated in the empty footpath of employing of having avoided existing in the prior art, Make result of calculation have the problem of relatively large deviation;
2, the energy threshold value in the inventive method can be according to searching for multipath information and the correlation energy of coming out Size set or adjusted, to optimize the multipath that calculates for RTT;
3, the inventive method is carried out validity for the RTT value that calculates and is judged, if in measuring period Comprise energy and do not reach certain quantity greater than the signal frame number of setting the threshold value multipath, then do not adopt this Measured value in measuring period further guarantees the accuracy for the RTT value of location.
In sum, adopt RTT measured value that the inventive method obtains closer to the wireless application of reality Environment has further improved the positional accuracy of system.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from this Bright spirit and scope. Like this, if of the present invention these are revised and modification belongs to power of the present invention section and requires to reach The range of its equivalent technologies, then the present invention also be intended to comprise these change and modification interior.
Claims (6)
1. the winding time RTT of a Radio Link measures report method, comprises the following steps:
A, radio network controller issue RTT to the base station and measure message;
The multipath information of B, base station search present frame finds out energy greater than the minimum multipath of the phase place of setting the energy threshold value, and calculates its RTT value;
C, base station judge whether RTT arrives measuring period, if, then carry out step D, otherwise, go to step B;
The mean value of the whole RTT values that calculate is asked in D, base station, reports radio network controller as the RTT measured value of this RTT measuring period.
2. the method for claim 1, it is characterized in that, ask for the mean value of the whole RTT values that calculate in described base station, report before the radio network controller as the RTT measured value of this RTT measuring period, also include the base station and count RTT comprises the signal frame number of described multipath in measuring period step, if the signal frame number that comprises described multipath is greater than the signal frame threshold value of setting, then the base station thinks that the RTT measured value that reports is effective, otherwise the RTT measured value of this measuring period is invalid.
3. method as claimed in claim 2 is characterized in that, the base station adopts counters count to go out RTT comprises described multipath in measuring period signal frame number.
4. method as claimed in claim 3 is characterized in that, described base station adopts counters count to go out described signal frame number, and concrete grammar is:
Starting RTT moment measuring period, described counter is put 0;
If comprise described multipath in the multipath information of present frame, then make described counter add 1;
When RTT arrived measuring period, the currency of described counter was this RTT comprises described multipath in measuring period signal frame number.
5. method as claimed in claim 3 is characterized in that described counter is arranged in the base station.
6. the winding time RTT of a Radio Link measures report method, comprises the following steps:
A, radio network controller issue RTT to the base station and measure message;
The multipath information of B, base station search present frame finds out energy greater than the minimum multipath of the phase place of setting the energy threshold value, and calculates its RTT value;
C, base station go to step B if judge also no show RTT measuring period; The base station is if judge that RTT arrives measuring period, judge further that then whether RTT comprises the signal frame number of described multipath greater than the signal frame threshold value of setting in measuring period, if greater than then carrying out step D, otherwise, abandon the whole RTT values that calculate in this cycle, reporting to radio network controller temporarily to provide effective measured value information;
The mean value of the whole RTT values that calculate is asked in D, base station, reports radio network controller as the RTT measured value of this RTT measuring period.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100710571A CN100413374C (en) | 2005-05-23 | 2005-05-23 | Metering reporting method for loop time of radio link |
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| CNB2005100710571A CN100413374C (en) | 2005-05-23 | 2005-05-23 | Metering reporting method for loop time of radio link |
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| CN100413374C true CN100413374C (en) | 2008-08-20 |
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| CN102006136A (en) * | 2010-12-17 | 2011-04-06 | 武汉邮电科学研究院 | Method and device for improving clock synchronization precision in EPON |
| CN104348561B (en) * | 2013-08-07 | 2017-08-25 | 中国科学院声学研究所 | The synchronous method of subsurface communication net based on Centralized Topology |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001089254A1 (en) * | 2000-05-15 | 2001-11-22 | Nokia Corporation | Method to calculate true round trip propagation delay and user equipment location in wcdma/utran |
| CN1378392A (en) * | 2001-03-30 | 2002-11-06 | 华为技术有限公司 | identifying method and device for non-visual route in CDMA cellular mobile communication system |
| CN1536850A (en) * | 2003-04-09 | 2004-10-13 | 深圳市中兴通讯股份有限公司南京分公 | Moving location method based on residential quarter mark and loopback time |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001089254A1 (en) * | 2000-05-15 | 2001-11-22 | Nokia Corporation | Method to calculate true round trip propagation delay and user equipment location in wcdma/utran |
| CN1378392A (en) * | 2001-03-30 | 2002-11-06 | 华为技术有限公司 | identifying method and device for non-visual route in CDMA cellular mobile communication system |
| CN1536850A (en) * | 2003-04-09 | 2004-10-13 | 深圳市中兴通讯股份有限公司南京分公 | Moving location method based on residential quarter mark and loopback time |
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