CN101170319A - A method for filtering interference signals and base station - Google Patents
A method for filtering interference signals and base station Download PDFInfo
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- CN101170319A CN101170319A CNA2007101781728A CN200710178172A CN101170319A CN 101170319 A CN101170319 A CN 101170319A CN A2007101781728 A CNA2007101781728 A CN A2007101781728A CN 200710178172 A CN200710178172 A CN 200710178172A CN 101170319 A CN101170319 A CN 101170319A
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Abstract
The invention discloses a method and a base station for filtering jamming signals. The base station includes: a channel processor for receiving channel access request information; a frame unit controller for recording and sending channel request information to a base station controller when the times of channel access request information recording is smaller than a first preset value; when the times of channel access request information recording is bigger than or equal to the first preset value, the frame unit controller filters the channel access request information according to filtering conditions, and sends incorrect report information. The invention provides users with a simple and efficient solution to filter jamming signals, particularly jamming signals of common frequency. In addition, the invention also avoids the increase of invalid signal load on the interface between the base station and the base station controllers through the complete filtering of jamming signals.
Description
Technical field
The present invention relates generally to field of mobile communication, relates in particular to a kind of method, base station and system of filtering interference signals.
Background technology
Global system for mobile communications (GSM, Global System for Mobile Communication) as second generation mobile cellular communication system, has worldwide obtained extensive use.But along with the continuous increase of network capacity, channeling is more and more tightr, and 3G (Third Generation) Moblie (3G, 3
RdGeneration) the progressively deployment of various standard networks in, wireless environment becomes and becomes increasingly complex, meanwhile, various electronic equipments, air communications, a large amount of uses of medical microwave apparatus, the continuous increase that causes various wireless networks to disturb.
Interference is the key factor that influences network indexes such as gsm system speech quality and cutting off rate, call completing rate.The interference that gsm system is subjected to comprises multiple, and as up interference, descending interference, co-channel interference, adjacent interference frequently etc., but generally speaking, the interference of gsm system is divided into three major types, i.e. external disturbance, internal interference and Intermodulation Interference.
It is intricate to disturb, often flickering, and eliminating is got up very loaded down with trivial details, wherein comparatively is typically co-channel interference.As everyone knows, in the wave point of gsm system, insert at random and switch access signaling and often use identical coding and pulse mode, promptly adopting 8 information codes to add 6 bit parity check positions encodes, and 6 bit parity check positions wherein need with base station identity code (BSIC, Base StationIdentity Code) the phase XOR of Target cell.When base station (BTS, Base Transceiver Station) receives the access request message,,, then carry out next step decoding if identical with the BSIC comparison of the BSIC in this information and this sub-district.At this moment, if there is the identical Broadcast Control Channel (BCCH of having of close together, Broadcast Control Channel) and two base stations of BSIC, so when the sub-district that portable terminal covers simultaneously in these two base stations makes a call, the access request of portable terminal all will be received in two base stations, and all think it oneself is the object that mobile terminal request inserts, therefore, SDCCH Stand-alone Dedicated Control Channel (SDCCH all will be distributed for this portable terminal in two base stations, Stand-alone Dedicated Control Channel), and can only accept the SDCCH of one of them base station as the portable terminal that inserts the requesting party, the SDCCH of another base station then can be because of not received overtime overflowing by this portable terminal, and this base station corresponding district network system will be according to SDCCH call drop of this situation record.In addition, in having a plurality of sub-districts that a plurality of base station covered of identical BCCH and BSIC, also cause the handoff failure of portable terminal easily.Fig. 1 is the co-channel interference schematic diagram between the sub-district that two base stations cover in the prior art.Among Fig. 1, comprise first base station 101, second base station 102 and be in a portable terminal 103 in the network cell.When portable terminal 103 makes a call, first base station 101 and the second base station 102 access request that all can receive portable terminal probably, and all will think it oneself is the object that mobile terminal request inserts.
At present, along with the continuous increase of existing network capacity, channeling is more and more tightr, and this co-channel interference phenomenon will be more and more general.The standard gsm protocol when interference phenomenon takes place, will cause a large amount of SDCCH to assign failure because interference signal filtering mechanism is not set.Traditional interference filtering method is to identify interference signal earlier, then by filtering with the interference signal filtering.But when having the co-channel interference signal, it is powerless that this method just seems.Because co-channel interference signal and actual signal are as broad as long on waveform, prior art has proposed a kind of assigning method and has come filtering co-channel interference signal, promptly only preserve the access request message of last time, and this method needs base station and base station controller (BSC, Base Station Controller) fellowship, could the complete filtering of signaling will be disturbed, in addition, because this method does not consider to insert Timing Advance (TA in the request message, Timing Advance) etc. therefore factor causes easily with real call signal filtering.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of method and base station of filtering interference signals.By this method and base station, be reached for the user provide a cover simply, filtering interference signals efficiently, the purpose of the solution of especially filtering co-channel interference signal.
The invention provides a kind of method of filtering interference signals, comprising:
Receive and record channel access request message;
When channel inserts request message record number of times more than or equal to first predetermined value, according to filtercondition channel is inserted request message and carry out filtering, and send error reporting message.
This method also comprises:
When channel inserted request message record number of times less than first predetermined value, transmitting channel required message.
The described channel of this method inserts request message and comprises that current channel inserts request message and the time is adjacent to the channel access request message that current channel inserts request message;
The channel access request message that described current channel access request message of this method and time are adjacent to current channel access request message comprises access delay, access value at random, frame number information and received signal strength indicator value.
The described filtercondition of this method comprises:
Whether the access delay of judging current channel access request message is less than or equal to scheduled time lead, if current channel is inserted request message and time is adjacent to first predetermined value channel access request message that current channel inserts request message and compares; Otherwise, current channel is inserted request message and time is adjacent to second predetermined value channel access request message that current channel inserts request message and compares.
The described filtercondition of this method also comprises:
Be adjacent on current channel inserts request message and time that channel that current channel inserts request message inserts that the access value at random of request message is identical, the difference between the frame number information is less than the difference of being scheduled to difference, access delay between frame number information during less than predetermined access delay difference, transmission error reporting message.
This method current channel insert request message and be adjacent on the time that channel that current channel inserts request message inserts that the access value at random of request message is inequality, difference between the frame number information is more than or equal to the difference of being scheduled to difference, access delay between frame number information during more than or equal to predetermined access delay difference, transmitting channel requirement message.
This method also comprises:
The quantity of the error reporting message that sends in the section surpasses when being scheduled to the error reporting message count at the fixed time, reduces up receiving sensitivity;
When the quantity of the error reporting message that sends in the section is less than predetermined error reporting message count at the fixed time, recovers up receiving sensitivity, and send recovery message.
The present invention also provides a kind of base station of filtering interference signals, comprising:
Channel processor is used for receive channel and inserts request message;
Frame Unit Controller is used for record and when channel inserted request message record number of times less than first predetermined value, transmitting channel required message; When channel inserts request message record number of times more than or equal to first predetermined value, according to filtercondition channel is inserted request message and carry out filtering, and send error reporting message.
The described Frame Unit Controller in this base station also is used for the control channel processor and reduces up receiving sensitivity, and transmitting channel requires message, recovers up receiving sensitivity and send to recover message.
The described Frame Unit Controller in this base station further comprises judge module and time block,
The described channel in this base station inserts request message and comprises that current channel inserts request message and the time is adjacent to the channel access request message that current channel inserts request message; The channel access request message that current channel access request message and time are adjacent to current channel access request message comprises access delay, access value at random, frame number information and received signal strength indicator value;
The described judge module in this base station is used to judge whether the access delay of current channel access request message is less than or equal to scheduled time lead; Judge current channel insert be adjacent on request message and time channel that current channel inserts request message inserts whether the access value at random of request message identical, the difference between the frame number information whether less than the difference of being scheduled to difference, access delay between frame number information whether less than predetermined access delay difference; Whether the quantity of judging the error reporting message that sends in the scheduled time surpasses predetermined error reporting message count;
The described time block in this base station is used for error reporting message is monitored in real time.
Method of the present invention and base station, by the channel processor (CHP in the base station, ChannelProcessor) burst inserts (AB in the access request message that portable terminal is sent, Access Burst) access delay of pulse (Access Delay) value and access (Random Access) value at random, and channel inserts the frame number information (T1 in the request message, T2, T3) and received signal intensity indication (RSSI, Received Signal Strength Indication) value sends to Frame Unit Controller, compare and discriminatory analysis according to these parameters by Frame Unit Controller, detect interference signal also with this interference signal filtering, being reached for the user provides a cover simple, detect efficiently and filtering interference signals, especially the beneficial effect of the solution of detection and filtering co-channel interference signal.In addition, the present invention passes through the fully filtration of base station self realization to the interference signaling, thereby has avoided the increase of inactive signaling load on the interface between base station and the base station controller.
Description of drawings
Fig. 1 is the co-channel interference schematic diagram between the sub-district that two base stations cover in the prior art;
Fig. 2 is the signaling process figure of adaptive disturbance filtering in the specific embodiment of the invention;
Fig. 3 is the structured flowchart of adaptive disturbance filtering appts in the specific embodiment of the invention;
Fig. 4 is the method flow diagram of adaptive disturbance filtering in the present invention's first specific embodiment;
Fig. 5 is the method flow diagram of adaptive disturbance filtering in the present invention's second specific embodiment.
Embodiment
Describe specific embodiments of the invention in detail below in conjunction with accompanying drawing.
In the specific embodiment of the invention, described base station is after receiving the channel access request message that travelling carriage sends, the decode results that channel processor in the base station not only inserts channel the burst access pulse in the request message sends to Frame Unit Controller, the access delay value of access pulse and the frame number information (T1 in access value at random and the channel access request message also will happen suddenly, T2, T3) and received signal strength indicator value send to Frame Unit Controller, Frame Unit Controller adopts a plurality of judgment mechanisms to realize filtering to interference signal according to these parameters.
Fig. 2 is the signaling process figure of adaptive disturbance filtering in the specific embodiment of the invention, and concrete implementation step is as follows:
In this step, base station 301 receives a secondary channel insert request message after, will carry out once record, and will write down number of times and add 1.
In this step, the record number of times of channel access request message is judged more than or equal to first predetermined value in base station 301 whether, if, check that then the channel that has write down inserts the content of request message,
Checking process is as described below:
If the access delay that current channel inserts in the request message is less than or equal to the preset time lead, then check with the time on be adjacent to first predetermined value channel access request message that current channel inserts request message and whether satisfy filtercondition; If current channel inserts access delay in the request message greater than the preset time lead, then check with the time on be adjacent to second predetermined value channel access request message that current channel inserts the request message record and whether satisfy filtercondition.
Wherein, the general value of preset time lead is that the general value of 35, the first predetermined values is that the general value of 5, the second predetermined values is 3, but also can choose other numerical value according to actual conditions.
Filtercondition is as described below:
If current channel inserts and is adjacent to channel that current channel inserts request message on access value at random that burst in the request message inserts pulse and time to insert the access value at random of burst access pulse in the request message identical; And the frame number information T2 that current channel inserts request message be adjacent to current channel on the time and insert the difference of frame number information T2 of channel access request message of request message less than predetermined frame number information gap value; And current channel inserts access delay value that burst in the request message inserts pulse and is adjacent to the channel that current channel inserts request message on the time and inserts the difference of the access delay value of burst access pulse in the request message less than predetermined access delay difference, then satisfy filtercondition, give filtering.
In this step, described predetermined frame number information gap value value is 2, and described predetermined access delay difference value is 2, but also can choose other numerical value according to actual conditions.
Step 205, the Frame Unit Controller of 301 inside, base station send the message CHP DECREASE RX SENSITIVITY of the sensitivity that reduces up reception to channel processor.
Fig. 3 is the structured flowchart of adaptive disturbance filtering appts in the specific embodiment of the invention, comprises base station 301, base station controller 302 and operation maintenance center's wireless portion (OMC-R, OperationMaintenance Center-Radio) 304 among the figure, wherein,
Channel processor 3011 is used for receive channel and inserts request message, and is transmitted to Frame Unit Controller 3012.Wherein, this access request message comprises that burst inserts the access delay of pulse and access value at random and channel and inserts frame number information in the request message (T1, T2 is T3) with received signal strength indicator value.
Frame Unit Controller 3012 is used for record and when channel inserted request message record number of times less than first predetermined value, transmitting channel required message; When channel inserts request message record number of times more than or equal to first predetermined value, according to filtercondition channel is inserted request message and carry out filtering, and send error reporting message; Also being used to send the first message control channel processor 3011 reduces up receiving sensitivity, be about to current channel and insert RSSI value in the request message and bring up to more than the mean value of RSSI value that all channels in the historical record insert request messages, and the corresponding alarm of increase after the sensitivity of the up reception of each reduction.In addition, Frame Unit Controller 3012 also is used to send the second message control channel processor 3011 and recovers up receiving sensitivity, after the sensitivity of the up reception of each recovery, transmit the recovery message to operation maintenance center's wireless portion 304 by base station controller 302.
Judge module 30121 judges that whether current channel inserts the access delay of request message less than scheduled time lead; Judge current channel insert be adjacent on request message and time channel that current channel inserts request message inserts whether the access value at random of request message identical, the difference between the frame number information T2 whether less than the difference of being scheduled to difference, access delay between frame number information whether less than predetermined access delay difference; Whether the quantity of judging the error reporting message that sends in the scheduled time surpasses predetermined error reporting message count;
Time block 30122 is used for the error reporting message that sends to base station controller 302 is monitored in real time.
Above-mentioned first message is the message of the sensitivity of the up reception of reduction, and this first message is carried RSSI mean value; Above-mentioned second message is the message of the sensitivity of the up reception of recovery.
Fig. 4 is the method flow diagram of adaptive disturbance filtering in the base station system in the present invention's first specific embodiment, and concrete implementation step is as follows:
Step 402 judges that channel inserts the record number of times of request message whether less than first predetermined value, if enter step 403; Otherwise, enter step 405.
Step 405 is in 407, and the general value of preset time lead is that the general value of 35, the first predetermined values is that the general value of 5, the second predetermined values is 3, but also can choose other numerical value according to actual conditions.
In this step, described predetermined frame number information gap value value is 2, and described predetermined access delay difference value is 2, but also can choose other numerical value according to actual conditions.
On the basis of first specific embodiment, proposed interference signal to be carried out the second embodiment of the invention of filtering by reducing up receiving sensitivity.
Fig. 5 is the method flow diagram of adaptive disturbance filtering in the base station system in the present invention's second specific embodiment, and concrete implementation step is as follows:
In this step, channel processor inserts RSSI value in the request message with current channel and brings up to more than the mean value of RSSI value of all channels access request messages in the historical record.
In this step, the timing of timer is 15 minutes, certainly, also can choose other value according to actual conditions.
When step 504, Frame Unit Controller are finished at the timer timing, recover up receiving sensitivity by sending the message control channel processor that recovers up receiving sensitivity.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the method for a filtering interference signals is characterized in that, may further comprise the steps:
Receive and record channel access request message;
When channel inserts request message record number of times more than or equal to first predetermined value, according to filtercondition channel is inserted request message and carry out filtering, and send error reporting message.
2. method according to claim 1 is characterized in that, this method also comprises:
When channel inserted request message record number of times less than first predetermined value, transmitting channel required message.
3. method according to claim 1 is characterized in that,
Described channel inserts request message and comprises that current channel inserts request message and the time is adjacent to the channel access request message that current channel inserts request message;
The channel access request message that described current channel access request message and time are adjacent to current channel access request message comprises access delay, access value at random, frame number information and received signal strength indicator value.
4. method according to claim 3 is characterized in that, the described filtercondition of this method comprises:
Whether the access delay of judging current channel access request message is less than or equal to the preset time lead, if current channel is inserted request message and time is adjacent to first predetermined value channel access request message that current channel inserts request message and compares; Otherwise, current channel is inserted request message and time is adjacent to second predetermined value channel access request message that current channel inserts request message and compares.
5. according to claim 3 or 4 described methods, it is characterized in that the described filtercondition of this method also comprises:
Be adjacent on current channel inserts request message and time that channel that current channel inserts request message inserts that the access value at random of request message is identical, the difference between the frame number information is less than the difference of being scheduled to difference, access delay between frame number information during less than predetermined access delay difference, transmission error reporting message.
6. method according to claim 3, it is characterized in that, current channel insert request message and be adjacent on the time that channel that current channel inserts request message inserts that the access value at random of request message is inequality, difference between the frame number information is more than or equal to the difference of being scheduled to difference, access delay between frame number information during more than or equal to predetermined access delay difference, transmitting channel requirement message.
7. method according to claim 1 is characterized in that, this method also comprises:
The quantity of the error reporting message that sends in the section surpasses when being scheduled to the error reporting message count at the fixed time, reduces up receiving sensitivity;
When the quantity of the error reporting message that sends in the section is less than predetermined error reporting message count at the fixed time, recovers up receiving sensitivity, and send recovery message.
8. the base station of a filtering interference signals is characterized in that, comprising:
Channel processor is used for receive channel and inserts request message;
Frame Unit Controller is used for record and when channel inserted request message record number of times less than first predetermined value, transmitting channel required message; When channel inserts request message record number of times more than or equal to first predetermined value, according to filtercondition channel is inserted request message and carry out filtering, and send error reporting message.
9. base station according to claim 8 is characterized in that, described Frame Unit Controller also is used for the control channel processor and reduces up receiving sensitivity, and transmitting channel requires message, recovers up receiving sensitivity and send to recover message.
10. according to Claim 8 or 9 described base stations, it is characterized in that,
Described Frame Unit Controller further comprises judge module and time block,
Described channel inserts request message and comprises that current channel inserts request message and the time is adjacent to the channel access request message that current channel inserts request message; The channel access request message that current channel access request message and time are adjacent to current channel access request message comprises access delay, access value at random, frame number information and received signal strength indicator value;
Described judge module is used to judge whether the access delay of current channel access request message is less than or equal to scheduled time lead; Judge current channel insert be adjacent on request message and time channel that current channel inserts request message inserts whether the access value at random of request message identical, the difference between the frame number information whether less than the difference of being scheduled to difference, access delay between frame number information whether less than predetermined access delay difference; Whether the quantity of judging the error reporting message that sends in the scheduled time surpasses predetermined error reporting message count;
Described time block is used for error reporting message is monitored in real time.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103813307A (en) * | 2012-11-13 | 2014-05-21 | 中兴通讯股份有限公司 | False channel request filtering method and device |
| CN101848495B (en) * | 2009-03-27 | 2016-08-31 | 南京中兴新软件有限责任公司 | Random access processing method and processing system |
| CN110868753A (en) * | 2018-08-27 | 2020-03-06 | 成都鼎桥通信技术有限公司 | Resource allocation method, device and system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000261412A (en) * | 1999-03-06 | 2000-09-22 | Matsushita Electric Ind Co Ltd | Interference signal eliminating device |
| US7151790B1 (en) * | 2001-09-28 | 2006-12-19 | Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Industry | Automatic signal extraction and analysis from time-frequency representation |
| WO2006077829A1 (en) * | 2005-01-18 | 2006-07-27 | Ntt Docomo, Inc. | Mobile communication terminal, and multipath interference eliminating method |
| CN1992558B (en) * | 2005-12-29 | 2011-01-12 | 株式会社Ntt都科摩 | Radio communication system and radio communication method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101848495B (en) * | 2009-03-27 | 2016-08-31 | 南京中兴新软件有限责任公司 | Random access processing method and processing system |
| CN103813307A (en) * | 2012-11-13 | 2014-05-21 | 中兴通讯股份有限公司 | False channel request filtering method and device |
| CN103813307B (en) * | 2012-11-13 | 2017-12-08 | 中兴通讯股份有限公司 | The method and apparatus for filtering wrong channel request |
| CN110868753A (en) * | 2018-08-27 | 2020-03-06 | 成都鼎桥通信技术有限公司 | Resource allocation method, device and system |
| CN110868753B (en) * | 2018-08-27 | 2022-08-12 | 成都鼎桥通信技术有限公司 | Resource allocation method, device and system |
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