CN1856160B - Method for reducing re-inquiry rate of mobile linking in personal mobile telephone system - Google Patents
Method for reducing re-inquiry rate of mobile linking in personal mobile telephone system Download PDFInfo
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- CN1856160B CN1856160B CN2005100665010A CN200510066501A CN1856160B CN 1856160 B CN1856160 B CN 1856160B CN 2005100665010 A CN2005100665010 A CN 2005100665010A CN 200510066501 A CN200510066501 A CN 200510066501A CN 1856160 B CN1856160 B CN 1856160B
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Abstract
The invention is concerned with the method that reduces the occurrent rate of the handset establishing-link re-request in the personal handset system, including: 1) the base station intercepts the upward and downward RSSI value on the useable carrier frequency when the time-gap is free, and save the corresponding upward and downward RSSI value and the carrier frequency in the different table; 2) the base station lookup the carrier frequency that is lower than the threshold value in the upward RSSI value table after receiving the request of the handset establishing-link request; lookups the downward RSSI value of the carrier frequency and compares the corresponding threshold value if finds; assigns the channel of the carrier frequency to the handset if it is lower than the threshold value; estimates the RSSI value table whether or not finish if it is over the threshold value, assigns the smallest carrier frequency of the upward RSSI value to the handset if it is finish; returns to the step 2) and continues to lookup for the upward RSSI value of other carrier frequency if it is not finish; sends the refusing information of the establishing-link to the handset if not find the carrier frequency that the upward RSSI value is lower than the threshold value.
Description
Technical field
The present invention relates to dynamic channel assignment method among a kind of PHS (Personal Handyphone System, personal handyphone system), relate in particular to and reduce the method that the mobile phone link setup is asked incidence again in a kind of personal handyphone system.
Background technology
The PHS Personal Handyphone System adopts the microcellulor technology, and user side is inserted local network in the digital radio mode, and the local telephone network service that moves freely use in the area of coverage is provided.In its network service area, can get or answer city, domestic, overseas call easily, enjoy the convenience of city mobile phone with the price of landline telephone.The base station transmitting power of Personal Handyphone System only has 500 milliwatts, and the transmitting power of mobile phone has only 10 milliwatts, only is equivalent to a TV remote controller.Therefore, its growth momentum is quite swift and violent in recent years, is subjected to degree of concern more and more higher.
For the PHS network in the operation, the sustainable development of network is that the growth of customer volume sustainable growth and network user ARPU value is its task of top priority, and the good and difference of network quality is the key of supporting network sustainable development.The index of weighing a network quality is a lot, for the terminal use, nothing more than two indexs: the speech quality in time of call established (promptly working the connecting time of exhaling in the process) length and the communication process.For the latter, generally be because in the communication process customer location move or talk channel is interfered and causes speech quality to descend, can guarantee by certain handoff algorithms; For the former, the channel that the long reason of certain user's connecting time occurs and mainly be the base station original allocation is when carrying out channel synchronization with mobile phone, the mobile phone internal detection mechanism finds that current allocated channel is unavailable for mobile phone, this moment mobile phone can to initiate that link setup asks again to the base station be that (Link Channel Establishment Re-request) asked in the defined link establishment of PHS over-the-air protocol again, so just increased the call proceeding time, when disturbing comparatively seriously, it is obstructed to cause the user to dial continuously.Therefore in the network, it is an important means of improving network quality that the link setup that as far as possible reduces mobile phone is asked incidence again.
Ask incidence again for the link setup that reduces mobile phone, can networking plan in earlier stage with the later stage network optimization in by to the planning of site, base station with adjust the generation that reduces interference as far as possible, thereby the reduction link setup is asked incidence again; This method more depends on engineering staff's experience and to the field survey of network, wastes time and energy and need and adjust at set intervals again.This is the mode of seeing after a kind of.
More efficiently mode then is the mode by foreknowledge, promptly increases the channel transceiver testing mechanism of similar mobile phone when the base station assigns resource.
According to the regulation of RCR STD-28 agreement, the air interface communication between PCS (Personal Communication Services, Personal Communications Services) base station and the mobile phone adopts the TDMA/TDD mode to work.As shown in Figure 1, the cycle of signal frame is 5ms, and every frame divides 8 time slots, comprises 4 descending time slots and 4 ascending time slots, forms 4 channels, and one of them channel is control channel (CCH), and its excess-three is individual to be Traffic Channel (TCH).At present the general processing method that detects for carrier frequency is: the base station at one's leisure on the crack searching and detecting carrier frequency at the RSSI of receiving slot (Received Signal Strength Indicator, the indication of received signal intensity) value (general 10ms can finish the searching and detecting of a carrier frequency), arrange order assignment when resource allocation according to certain priority.The advantage of Chu Liing is the disturbed condition that is subjected to that detected value has embodied the base station side frequency like this, realizing comparatively simple and having certain testing mechanism, shortcoming is that simple the detection receives that then may to exist mobile phone and base station to detect effect inconsistent and cause the request again of link setup when system synchronization is bad.
Summary of the invention
Carry out the existing problem and shortage of method for channel allocation at base station in the above-mentioned existing PHS system to mobile phone, the purpose of this invention is to provide a kind of link setup of can effectively avoiding and ask again, realize to reduce the method that the mobile phone link setup is asked incidence again in the simple PHS system.
The present invention is achieved in that and reduces the method that the mobile phone link setup is asked incidence again in a kind of personal handyphone system, may further comprise the steps:
1) uplink and downlink received signal intensity indication (RSSI) value on all available carrier frequencies is intercepted in the base station when time slot is idle, and this carrier frequency and corresponding uplink and downlink received signal strength indicator value thereof are stored in respectively in the different tables;
2) receive the request of mobile phone link setup after, the carrier frequency that is lower than threshold value in the up received signal strength indicator value table is at first searched in described base station; If find, find this carrier frequency down receiving signal strength indicator value again, and compare with corresponding threshold value:
A, if be lower than this threshold value, this carrier frequency channel is distributed to mobile phone;
B, if exceeded this threshold value, judge then whether received signal strength indicator value table has been searched to finish, finish if search, then the carrier frequency channel of up received signal strength indicator value minimum is distributed to mobile phone; If search and do not finish, then return step 2) in table, continue to search the up received signal of other carrier frequency strength indicator value;
If do not find the carrier frequency that up received signal strength indicator value is lower than threshold value, then issue link setup refusal information to mobile phone.
Preferably, this method also comprises: if without any available carrier frequencies, promptly uplink and downlink received signal strength indicator value table then directly issues link setup refusal information to mobile phone for empty.
Preferably, described received signal strength indicator value table is the dynamic memory table, and the base station is carried out corresponding renewal by scanning result to it after carrying out carrier frequency scanning in the time slot free time.
Abide by RCR STD-28 agreement, described uplink and downlink received signal desirable one-level threshold value of strength indicator value's threshold value or twice gated service value, or get its combination simultaneously.One-level thresholding reference point is 44dbuv, and the twice gated service reference point is 26dbuv.
Before carrying out channel allocation, the present invention has increased the anticipation at mobile phone, promptly reception and the transmission RSSI to idle time slot carrier frequency judges when Resources allocation, thereby distribute one not only minimum but also also may minimum carrier frequency for mobile phone for base station interference, thereby reduce the link setup that the synchronization failure after the resource allocation causes asks as far as possible again, and then the link setup that reduces the PHS system mobile phone asks incidence again, and base station performance and network performance are very useful for improving.The present invention realizes that simply cost is lower.
Description of drawings
Below in conjunction with accompanying drawing the present invention is illustrated in further detail:
Fig. 1 is a TDMA/TDD frame structure schematic diagram in the PHS system;
Fig. 2 is a carrier frequency distribution process chart of the present invention.
Embodiment
The base station is when intercepting available carrier frequencies, and RCR STD-28 agreement has been stipulated two-stage thresholding: 26dbuv and 44dbuv.For the convenience of narrating, the present invention only gets the one-level judgement threshold, generally takes off limit 44dbuv.Suppose that R is a receiving slot RSSI judgement threshold, S is a sending time slots RSSI judgement threshold.And the incoming level judgement threshold of mobile phone is consistent with the base station, and promptly S, R are identical.
The transceiver of base station is stored all available carrier frequencies and the receiving slot RSSI value thereof that obtain respectively at time slot idle period of time scanning receiving slot, sending time slots, is designated as table 1; All available carrier frequencies and sending time slots RSSI value thereof are stored respectively, are designated as table 2.Table 1, table 2 upgrade with the continuous scanning of time slot free time.
As shown in Figure 2, handling process of the present invention is as follows:
1, the base station is at first inquired about idle time slot after receiving the up link setup request of mobile phone.If there is idle time slot, then from table 1, search the carrier frequency that whether exists the RSSI value to be lower than thresholding R:
1), if find such carrier frequency, from table 2, search again, check whether these frequencies satisfy RSSI value and be lower than S, if there is the carrier frequency that satisfies, then distributes and indicate to the mobile phone down distributing resource; If there is not satisfied carrier frequency, judge then whether all time slots have been searched to finish, finish if search, in order to reduce no frequency refusal, then from table 1, choose the carrier frequency that a RSSI value is lower than thresholding R and minimum; Do not finish if search, then return step 1 and continue to search.
2), if do not find such carrier frequency, then issue the refusal indication to mobile phone.
2,, then issue the refusal indication to mobile phone if there is not idle time slot.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those skilled in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (4)
1. reduce the method that the mobile phone link setup is asked incidence again in a personal handyphone system, it is characterized in that this method may further comprise the steps:
1) the uplink and downlink received signal strength indicator value on all available carrier frequencies is intercepted in the base station when time slot is idle, and this carrier frequency and corresponding uplink and downlink received signal strength indicator value thereof are stored in respectively in the different tables;
2) receive the request of mobile phone link setup after, the carrier frequency that is lower than up received signal strength threshold value in the up received signal strength indicator value table is at first searched in described base station; If find, find this carrier frequency down receiving signal strength indicator value again, and compare with corresponding downstream received signal strength threshold value:
A, if be lower than this down receiving signal strength threshold value, this carrier frequency channel is distributed to mobile phone;
B, if exceeded this down receiving signal strength threshold value, judge then whether received signal strength indicator value table has been searched to finish, finish if search, then the carrier frequency channel of up received signal strength indicator value minimum is distributed to mobile phone; Do not finish if search, then return step 2) continue to search;
If do not find the carrier frequency that up received signal strength indicator value is lower than up received signal strength threshold value, then issue link setup refusal information to mobile phone.
2. reduce the method that the mobile phone link setup is asked incidence again in the personal handyphone system according to claim 1, it is characterized in that, this method also comprises: if without any available carrier frequencies, promptly uplink and downlink received signal strength indicator value table then directly issues link setup refusal information to mobile phone for empty.
3. reduce the method that the mobile phone link setup is asked incidence again in the personal handyphone system according to claim 1 and 2, it is characterized in that, described received signal strength indicator value table is the dynamic memory table, and the base station is carried out corresponding renewal by scanning result to it after carrying out carrier frequency scanning in the time slot free time.
4. reduce the method that the mobile phone link setup is asked incidence again in the personal handyphone system according to claim 3, it is characterized in that, described uplink and downlink received signal strength threshold value is got first threshold value or second threshold value of RRC STD-28 agreement regulation, or gets first threshold value and the second threshold value combination simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100665010A CN1856160B (en) | 2005-04-27 | 2005-04-27 | Method for reducing re-inquiry rate of mobile linking in personal mobile telephone system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2005100665010A CN1856160B (en) | 2005-04-27 | 2005-04-27 | Method for reducing re-inquiry rate of mobile linking in personal mobile telephone system |
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| CN1856160A CN1856160A (en) | 2006-11-01 |
| CN1856160B true CN1856160B (en) | 2010-04-21 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101472001B (en) * | 2007-12-27 | 2011-08-17 | 上海粱江通信系统股份有限公司 | Telephone interception method with voice compression and voice circuit control |
| CN102256364A (en) * | 2010-05-18 | 2011-11-23 | 中兴通讯股份有限公司 | Channel distribution method, apparatus and system thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6006089A (en) * | 1996-03-06 | 1999-12-21 | Leader Electronics Corp. | System and method of measuring electric field strength |
| CN1391414A (en) * | 2001-06-11 | 2003-01-15 | 深圳市中兴通讯股份有限公司上海第二研究所 | Space channel selection method and device for base station system and distributed personal hand-held communication system |
| CN1489402A (en) * | 2002-10-11 | 2004-04-14 | 深圳市中兴通讯股份有限公司 | Base station control time-gap and business frequency allocation method for PHS system |
-
2005
- 2005-04-27 CN CN2005100665010A patent/CN1856160B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6006089A (en) * | 1996-03-06 | 1999-12-21 | Leader Electronics Corp. | System and method of measuring electric field strength |
| CN1391414A (en) * | 2001-06-11 | 2003-01-15 | 深圳市中兴通讯股份有限公司上海第二研究所 | Space channel selection method and device for base station system and distributed personal hand-held communication system |
| CN1489402A (en) * | 2002-10-11 | 2004-04-14 | 深圳市中兴通讯股份有限公司 | Base station control time-gap and business frequency allocation method for PHS system |
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