CN101056453A - Base station frequency point scanning and selection method of the radio city phone system - Google Patents
Base station frequency point scanning and selection method of the radio city phone system Download PDFInfo
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- CN101056453A CN101056453A CNA2006100667538A CN200610066753A CN101056453A CN 101056453 A CN101056453 A CN 101056453A CN A2006100667538 A CNA2006100667538 A CN A2006100667538A CN 200610066753 A CN200610066753 A CN 200610066753A CN 101056453 A CN101056453 A CN 101056453A
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Abstract
The invention discloses a method for scanning and selecting frequency points of a base staion in a wireless urban telephone system, solves a problem that a current technic can not simultaneously scan all frequency points and detect validity of the frequency points after spreading a PHS system spectrum, the method comprises that: the base station orderly scans the frequency points in a frequency point table, the base station detects whether the frequency point signal intensity satisfies a frequency point selection threshold during a receiving time slot, if it satisfies, the frequency points are validated. After spreading a wireless urban telephone system spectrum, all of the frequency points can be scanned, the validity of the frequency points can be judged, thereby frequency point resource is availably used.
Description
Technical field
The present invention relates to a kind of scan method, relate in particular to a kind of PHS system (Personal Handy Phone System personal hand held phone system, the domestic wireless local telephone system that claims again) base station frequency point scan method.
Background technology
PHS (Personal Handy Phone System, domestic title wireless local telephone system) can provide cheap wireless service business, has obtained to develop rapidly, and the user has broken through 5,000 ten thousand.With the PHS business development, constantly to expand with the closely-related frequency resource of power system capacity, RCR STD28 agreement has been released the V4.0 version, and frequency range expands to 1884 MHz-1920MHz, and the frequency number has reached 120.
The PHS system is as picocellular systems, and system's overlay model complexity is difficult to carry out frequency point allocation by frequency planning, adopts dynamic frequency point scanning mode to solve the frequency planning problem.According to handling through Interference Detection in the RCR STD-28 agreement frequency 2 seconds before use, in continuous 4 frames, satisfy the frequency point scanning threshold requirement, maximum scan frequency number is: 2 seconds/5 milliseconds/4=100, less than frequency range regulation frequency number.
Overcome the above problems existing dual mode: 1) restriction scanning band scope, some dynamic frequency point allocation algorithm is done conservative estimation (as shown in Figure 1), and the maximum scan time period is 800 milliseconds, and scanning frequency number is 40.2) some dynamic frequency point allocation algorithm is not limited in the prescribed limit interscan, does not do requirement for validity.
Networking initial stage frequency is limited, and above dual mode is not all done frequency planning, the dynamic scan frequency, but along with the expansion of frequency, can't satisfy the demands.For addressing this problem, we have proposed a kind of control channel process information sign frequency point scanning validity of utilizing, and according to control channel process information and Interference Detection information, judge the frequency availability, reduce phase mutual interference between the base station.
Summary of the invention
At defective and the deficiency that prior art exists, the invention provides a kind of wireless local telephone system spread spectrum after, can scan all frequencies, and the wireless local telephone system base station frequency point scanning system of selection that its validity is judged.
In order to reach the foregoing invention purpose, wireless local telephone system base station frequency point scanning of the present invention system of selection, comprise: the base station is scanned successively to each frequency in the frequency table, described base station is detected the frequency signal strength indication value at receiving slot and whether is satisfied frequency selection thresholding, if satisfy, this frequency is effective.
Above-mentioned wireless local telephone system base station frequency point scanning system of selection also comprises: whether judge frequency point scanning time of described frequency and frequency point allocation time value sum less than two seconds, if satisfy condition, give receiving slot with described frequency point allocation.
Above-mentioned wireless local telephone system base station frequency point scanning system of selection, wherein, described frequency selects thresholding that the two-stage thresholding is arranged: first order thresholding, frequency signal strength indication value be less than 26dBuV, second level thresholding, the frequency signal strength indication value is less than 44dBuV.
Above-mentioned wireless local telephone system base station frequency point scanning system of selection, wherein, the frequency that satisfies first order thresholding is preferred, and, just selects for use and satisfies second level thresholding frequency all greater than 26dBuV in all frequency signal strength indication value.
Above-mentioned wireless local telephone system base station frequency point scanning system of selection, wherein, the base station to the concrete steps that each frequency in the frequency table scans successively is:
5 milliseconds of execution of frequency point scanning are once carried out scan round to all frequencies in the frequency table, and 1 frequency of 20 milliseconds of scanning is handled as follows:
(1) frequency to be scanned is selected in the base station from scanning frequency class table;
(2) the frequency point scanning time of each frequency adds 5 milliseconds in the scanning frequency class table;
(3) whether channel distributes, and is to enter step (4), otherwise enters step (6);
(4) this frequency is scanned, judge whether this frequency to be carried out four scanning, be execution in step (5), otherwise return step (2);
(5) RSSI value is detected at receiving slot in the base station, and exports the RSSI mean value of 4 scannings, relatively draws this frequency RSSI threshold level by what select thresholding with frequency, and this frequency point scanning time of scanning frequency is initialized as 0;
(6) select next frequency execution in step (2).
Above-mentioned wireless local telephone system base station frequency point scanning system of selection, wherein, determine that the effective detailed process of frequency is:
[1] receives cellular link and set up request, obtain the distribution time according to the control link condition;
[2] judged whether idle time slot, if there is not execution in step [5], otherwise execution in step [3];
[3] whether the described frequency point scanning time less than subtracting this frequency point allocation time in 2 seconds, if, by link assignment distribution of messages frequency point of time slot, otherwise execution in step [4];
[4] the notice mobile phone frequency is busy;
[5] notice mobile phone time slot is busy.
Wireless local telephone system base station frequency point scanning of the present invention system of selection, the base station is scanned successively to each frequency in the frequency table, and described base station is detected the frequency signal strength indication value at receiving slot and whether is satisfied frequency selection thresholding, if satisfy, this frequency is effective.After having solved the PHS system spread-spectrum, prior art can't satisfy the whole frequencies of scanning simultaneously and detect the problem of frequency validity, has effectively utilized the frequency resource.
Description of drawings
Fig. 1 is a frequency point scanning time restriction schematic diagram;
Fig. 2 is a control channel logic superframe structure schematic diagram;
The ageing process chart of Fig. 3 frequency.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing:
Wireless local telephone system base station method for scanning frequency points of the present invention, comprise the ageing processing procedure of frequency point scanning processing procedure and frequency, in the frequency point scanning processing procedure, the validity of this frequency at each time slot is scanned, judged in the base station successively to all frequencies, and to this frequency point scanning time T 1 timing; In the ageing processing procedure of frequency, after mobile phone makes a call the request of setting up, 2 timing of frequency point allocation time T, the link assignment message that carries the frequency point information that meets the transmission condition sends to the user by control channel.
Frequency validity and frequency point scanning time T 1, frequency point allocation time T 2 are closely related.Frequency point scanning time T 1 is carved into when being meant frequency point scanning distributes the time difference constantly, and effective time after the T1 writing scan constantly, initial value is 0 millisecond, and is intact in each 5 milliseconds of scan process, adds 5 milliseconds.Distribute time T 2 to be meant that frequency point allocation arrives the mobile phone time, should be according to protocol requirement T1+T2 less than 2 seconds.
In the frequency point scanning processing procedure, the base station is carried out frequency point scanning according to the PHS frame structure to each time slot.Each time slot all detects business frequency in the whole frequency band scope, with all frequencies according to sequence arrangement from low to high, form scanning frequency class table, during scanning, according to scanning in proper order from low to high, the per 5 milliseconds of execution of frequency point scanning once, each frequency is in case detect effectively, with scanning frequency counting N writing scan number of times, same frequency is carried out 4 times continuously, and N gets 0,1,2,3, count N=0 after the N=3 next time, 20 milliseconds scan 1 frequency altogether, and the result gets the average of 4 scannings, to guarantee the accuracy of scanning result.Scanning result is exported with the form of RSSI (Received Signal Strength Indication, signal strength signal intensity indication) value, and selects the two-stage thresholding according to the frequency of RCR STD-28 agreement regulation:
First order thresholding RSSI value is less than 26dBuV,
Second level thresholding RSSI value is greater than 26dBuV, less than 44dBuV.
Determining to have only the frequency of RSSI value in first order thresholding and second level thresholding is effective frequency.
Wherein, first order thresholding is the preferential thresholding of selecting.
Described frequency point scanning processing procedure is divided into following steps as shown in Figure 3:
(1) base station receives the request for building link message that mobile phone sends;
(2) from scanning frequency class table, select frequency to be scanned;
(3) the frequency point scanning time of each frequency adds 5 milliseconds in the scanning frequency class table;
(4) whether channel distributes, and is to enter step (7), otherwise enters step (5);
(5) this frequency is scanned, and scanning frequency counting N is added 1, judge whether N equals 0, if equal 0, execution in step (6), otherwise return step (3);
(6) RSSI value is detected at receiving slot in the base station, and exports the RSSI mean value of 4 scannings, relatively draws this frequency RSSI threshold level by what select thresholding with frequency, and this frequency point scanning time of scanning frequency is initialized as 0, execution in step (7);
(7) select next frequency execution in step (3).
In the ageing processing procedure of frequency, frequency point allocation time T 2 has close ties with LCCH (Logical Control Channel logical control channel).100 milliseconds of appearance of control channel once, be divided into BCCH (Broadcast controlchannel broadcast channel), PCH (Paging channel paging channel) and SCCH (Signalling control channel signaling control channel) according to purposes, stipulate that according to agreement various channels send with some cycles, BCCH, PCH, SCCH in each cycle form a LCCH logic superframe of 1.2 seconds, as shown in Figure 2.
As shown in Figure 1, the link assignment message (LinkChannelAssignment) of carrying frequency point information can issue by SCCH, also can issue by idle PCH, frequency point allocation time T 2 can the LCCH disposition be determined when receiving request for building link (LinkChannelEstablishmentRequest) message: the base station is according to receiving LinkChannelEstablishmentRequest, inquiry is according to PCH message queue and SCCH message queue, obtain SCCH and send required time T2, according to frequency table intermediate-frequeney point scanning back time T 1, according to T1+T2 is effectively to stipulate less than 2 seconds, can determine whether frequency is effective.
The ageing processing procedure of frequency is as follows:
The first step receives cellular link and sets up when asking, and checks the LCCH treatment situation, according to SCCH formation and PCH formation situation, obtains the distribution time;
Second step judged whether idle time slot, if do not carry out for the 8th step, otherwise carried out for the 3rd step;
The 3rd step, judge whether idle time slot has RSSI to satisfy the frequency of first order thresholding, if the 4th step of execution is arranged, otherwise carried out for the 5th step;
The 4th step, satisfy from RSSI and to select a frequency the frequency of first order thresholding, judge the frequency point of time slot T1 counting that satisfies condition whether less than subtracting T2 in 2 seconds, if, by link assignment distribution of messages frequency point of time slot, otherwise reject this frequency, returned for the 3rd step;
The 5th step, judge whether idle time slot has RSSI to satisfy second level thresholding frequency, if the 6th step of execution is arranged, otherwise carried out for the 7th step;
The 6th step, satisfy from RSSI and to select a frequency the frequency of second level thresholding, judge the frequency point of time slot T1 counting that satisfies condition whether less than subtracting T2 in 2 seconds, if, by link assignment distribution of messages frequency point of time slot, otherwise reject this frequency, returned for the 5th step;
In the 7th step, the notice mobile phone frequency is busy;
In the 8th step, notice mobile phone time slot is busy.
Claims (6)
1, a kind of wireless local telephone system base station frequency point scanning system of selection is characterized in that comprising:
1) scan round is carried out successively to each frequency in the frequency table in the base station;
2) at receiving slot, the base station is detected the frequency signal strength indication value that is scanned and whether is satisfied frequency selection thresholding, if satisfy, this frequency is effective.
2, wireless local telephone system base station frequency point scanning according to claim 1 system of selection, it is characterized in that also comprising: judge that whether frequency point scanning time of described frequency and frequency point allocation time value sum are less than two seconds, if satisfy condition, give receiving slot with described frequency point allocation.
3, wireless local telephone system base station frequency point scanning according to claim 1 system of selection, it is characterized in that: described frequency selects thresholding that the two-stage thresholding is arranged: first order thresholding, the frequency signal strength indication value is less than 26dBuV, second level thresholding, and the frequency signal strength indication value is less than 44dBuV.
4, wireless local telephone system base station frequency point scanning according to claim 3 system of selection, it is characterized in that: the frequency that satisfies first order thresholding is preferred,, just select for use and satisfy second level thresholding frequency during in all frequency signal strength indication value all greater than 26dBuV.
5, wireless local telephone system base station frequency point scanning according to claim 1 system of selection is characterized in that: the base station to the concrete steps that each frequency in the frequency table scans successively is:
5 milliseconds of execution of frequency point scanning are once carried out scan round to all frequencies in the frequency table, and 1 frequency of 20 milliseconds of scanning is handled as follows:
(1) frequency to be scanned is selected in the base station from scanning frequency class table;
(2) the frequency point scanning time of each frequency adds 5 milliseconds in the scanning frequency class table;
(3) whether channel distributes, and enters step (4) if distribute, otherwise enters step (6);
(4) this frequency is scanned, judge that this frequency whether by four scanning, is execution in step (5), otherwise returns step (2);
(5) RSSI value is detected at receiving slot in the base station, and exports the RSSI mean value of 4 scannings, relatively draws this frequency RSSI threshold level by what select thresholding with frequency, and this frequency point scanning time of scanning frequency is initialized as 0;
(6) select next frequency execution in step (2).
6, according to claim 2 or 4 described wireless local telephone system base station frequency point scanning systems of selection, it is characterized in that: determine that the effective detailed process of frequency is:
[1] receives cellular link and set up request, obtain the distribution time according to the control link condition;
[2] judged whether idle time slot, if there is not execution in step [5], otherwise execution in step [3];
[3] whether the described frequency point scanning time less than deducting this frequency point allocation time in 2 seconds, if, by link assignment distribution of messages frequency point of time slot, otherwise execution in step [4];
[4] the notice mobile phone frequency is busy;
[5] notice mobile phone time slot is busy.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101867961A (en) * | 2010-06-21 | 2010-10-20 | 中兴通讯股份有限公司 | Method, device and system for measuring antenna aperture background noise of base station |
| CN101977421A (en) * | 2010-09-08 | 2011-02-16 | 京信通信系统（中国）有限公司 | Multi-frequency point rapid scanning method |
| CN101296469B (en) * | 2008-06-02 | 2011-06-15 | 深圳国人射频通信有限公司 | GSM signal frequency point detection method and device thereof |
| CN101500247B (en) * | 2009-02-25 | 2011-06-29 | 珠海银邮光电技术发展股份有限公司 | Method for automatically tracing host base station carrier by GSM repeater |
| CN102118760A (en) * | 2009-12-30 | 2011-07-06 | 中兴通讯股份有限公司 | Method, device and system for realizing networking in wireless network |
| CN104796163A (en) * | 2015-03-12 | 2015-07-22 | 昆腾微电子股份有限公司 | Device and method for realizing automatic frequency correspondence in wireless receiving equipment |
-
2006
- 2006-04-11 CN CN200610066753A patent/CN100589635C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101296469B (en) * | 2008-06-02 | 2011-06-15 | 深圳国人射频通信有限公司 | GSM signal frequency point detection method and device thereof |
| CN101500247B (en) * | 2009-02-25 | 2011-06-29 | 珠海银邮光电技术发展股份有限公司 | Method for automatically tracing host base station carrier by GSM repeater |
| CN102118760A (en) * | 2009-12-30 | 2011-07-06 | 中兴通讯股份有限公司 | Method, device and system for realizing networking in wireless network |
| WO2011079558A1 (en) * | 2009-12-30 | 2011-07-07 | 中兴通讯股份有限公司 | Realization method, device and system for networking in wireless network |
| CN101867961A (en) * | 2010-06-21 | 2010-10-20 | 中兴通讯股份有限公司 | Method, device and system for measuring antenna aperture background noise of base station |
| CN101977421A (en) * | 2010-09-08 | 2011-02-16 | 京信通信系统（中国）有限公司 | Multi-frequency point rapid scanning method |
| CN101977421B (en) * | 2010-09-08 | 2013-10-02 | 京信通信系统（中国）有限公司 | Multi-frequency point rapid scanning method |
| CN104796163A (en) * | 2015-03-12 | 2015-07-22 | 昆腾微电子股份有限公司 | Device and method for realizing automatic frequency correspondence in wireless receiving equipment |
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| CN100589635C (en) | 2010-02-10 |
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