CN101170319B - 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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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 to the field of mobile communications, and in particular, to a method, a base station, and a system for filtering interference signals.
Background
Global System for Mobile communications (GSM) has been widely used worldwide as a second generation Mobile cellular Communication System. But with the increasing capacity of networks, frequency reuse is becoming more and more compact, and third generation mobile communications (3G, 3)rdGeneration), the wireless environment becomes more and more complex, and meanwhile, the use of a large amount of various electronic devices, aviation communication and medical microwave instruments causes the continuous increase of various wireless network interferences.
The interference is an important factor influencing the call quality of the GSM system, the call drop rate, the call completing rate and other network indexes. The interference suffered by the GSM system includes various types, such as uplink interference, downlink interference, co-channel interference, adjacent channel interference, etc., but generally speaking, the interference of the GSM system is classified into three categories, namely external interference, internal interference and intermodulation interference.
The interference is complicated and complicated, is usually time-consuming, and is very complicated to remove, wherein the common-frequency interference is more typical. As is known, in the radio interface of the GSM system, the random access and handover access signaling are often coded in the same coding and pulse manner, i.e. 8-bit information Code plus 6-bit parity check bit is used for coding, and the 6-bit parity check bit needs to be xored with Base Station Identity Code (BSIC) of the target cell. When the Base Transceiver Station (BTS) receives the access request message, the BSIC in the message is compared with the BSIC of the cell, and if the BSIC is the same with the BSIC of the cell, the next decoding is carried out. At this time, if there are two base stations with the same Broadcast Control Channel (BCCH) and BSIC that are located closer to each other, when the mobile terminal initiates a call in a cell simultaneously covered by the two base stations, both base stations will receive an access request from the mobile terminal and both base stations consider themselves as an object to which the mobile terminal requests to access, therefore, both base stations will allocate a Stand-alone Dedicated Control Channel (SDCCH) to the mobile terminal, and the mobile terminal that is the access requester can only accept the SDCCH of one of the base stations, and the SDCCH of the other base station will overflow due to being not received by the mobile terminal, and the cell network system corresponding to the base station will record a SDCCH drop call according to the situation. In addition, handover failure of the mobile terminal is also easily caused in a plurality of cells covered by a plurality of base stations having the same BCCH and BSIC. Fig. 1 is a schematic diagram of co-channel interference between cells covered by two base stations in the prior art. In fig. 1, a first base station 101, a second base station 102 and a mobile terminal 103 in a network cell are included. When the mobile terminal 103 initiates a call, it is likely that both the first base station 101 and the second base station 102 will receive an access request from the mobile terminal and will consider themselves as the object of the access request from the mobile terminal.
At present, with the continuous increase of the capacity of the existing network, the frequency reuse is more and more compact, and the same frequency interference phenomenon is more and more common. The standard GSM protocol does not set an interference signal filtering mechanism, and when an interference phenomenon occurs, a large number of SDCCH assignment failures are caused. The conventional interference filtering method is to identify an interference signal and then filter the interference signal. However, this method is ineffective when there is an co-channel interference signal. Because the co-channel interference signal is not different from the real signal in waveform, the prior art proposes an assignment method to filter the co-channel interference signal, that is, only the last access request message is saved, and this method needs the joint participation of the Base Station and the Base Station Controller (BSC) to completely filter the interference signaling.
Disclosure of Invention
In view of the above, the present invention provides a method and a base station for filtering an interference signal. By the method and the base station, the aim of providing a set of simple and efficient solution for filtering interference signals, particularly co-channel interference signals, for a user is fulfilled.
The invention provides a method for filtering interference signals, which comprises the following steps:
receiving and recording a channel access request message;
and when the recording times of the channel access request message are greater than or equal to a first preset value, filtering the channel access request message according to the filtering condition, and sending an error report message.
The method further comprises the following steps:
and when the channel access request message recording times are less than a first preset value, sending a channel requirement message.
The method comprises the steps that the channel access request message comprises a current channel access request message and a channel access request message adjacent to the current channel access request message in time;
the method comprises the steps that the current channel access request message and the channel access request message which is adjacent to the current channel access request message in time comprise access delay, a random access value, frame number information and a received signal strength indication value.
The method comprises the following steps:
judging whether the access delay of the current channel access request message is less than or equal to the preset time lead, if so, comparing the current channel access request message with a first preset value of channel access request messages adjacent to the current channel access request message in time; otherwise, the current channel access request message is compared with a second predetermined number of channel access request messages adjacent in time to the current channel access request message.
The method further comprises the following steps:
and when the random access values of the current channel access request message and the channel access request message adjacent to the current channel access request message in time are the same, the difference value between the frame number information is smaller than the difference value between the preset frame number information, and the difference value of the access delay is smaller than the preset access delay difference value, sending an error report message.
The method sends the channel requirement information when the random access value of the current channel access request information is different from the random access value of the channel access request information adjacent to the current channel access request information in time, the difference value between the frame number information is larger than or equal to the difference value between the preset frame number information, and the difference value of the access delay is larger than or equal to the preset access delay difference value.
The method further comprises the following steps:
when the number of the error report messages sent in a preset time period exceeds the preset number of the error report messages, reducing the uplink receiving sensitivity;
and when the number of the error report messages sent in the preset time period is less than the preset number of the error report messages, recovering the uplink receiving sensitivity and sending a recovery message.
The invention also provides a base station for filtering interference signals, which comprises:
a channel processor for receiving a channel access request message;
the frame unit controller is used for recording and sending the channel request message when the recording times of the channel access request message is less than a first preset value; and when the recording times of the channel access request message are greater than or equal to a first preset value, filtering the channel access request message according to the filtering condition, and sending an error report message.
The frame unit controller of the base station is also used for controlling the channel processor to reduce the uplink receiving sensitivity, send channel request messages, recover the uplink receiving sensitivity and send recovery messages.
The frame unit controller of the base station further comprises a judging module and a timing module,
the channel access request message of the base station comprises a current channel access request message and a channel access request message adjacent to the current channel access request message in time; the current channel access request message and the channel access request message which is adjacent to the current channel access request message in time comprise access delay, a random access value, frame number information and a received signal strength indicating value;
the judging module of the base station is used for judging whether the access delay of the current channel access request message is less than or equal to the preset time lead; judging whether the random access values of the current channel access request message and the channel access request message adjacent to the current channel access request message in time are the same, whether the difference value between the frame number information is smaller than the difference value between the preset frame number information, and whether the difference value of the access delay is smaller than the preset access delay difference value; judging whether the number of the error report messages sent in the preset time exceeds the preset number of the error report messages;
the timing module of the base station is used for monitoring the error report message in real time.
The method and the base station of the invention send the Access Delay (Access Delay) value and the Random Access (Random Access) value of the Burst Access (AB, Access Burst) pulse in the Access request message sent by the mobile terminal, and the frame number information (T1, T2, T3) and the Received Signal Strength Indication (RSSI) value in the channel Access request message to the frame unit controller through the channel processor (CHP, Channelprocessor) in the base station, and the frame unit controller compares, judges and analyzes the parameters to detect the interference Signal and filter the interference Signal, thereby achieving the beneficial effect of providing a set of simple and efficient solution for detecting and filtering the interference Signal for users, especially for detecting and filtering the same-frequency interference Signal. In addition, the invention realizes the complete filtration of the interference signaling through the base station, thereby avoiding the increase of the invalid signaling load on the interface between the base station and the base station controller.
Drawings
Fig. 1 is a schematic diagram of co-channel interference between cells covered by two base stations in the prior art;
fig. 2 is a signaling flow diagram of adaptive interference filtering in an embodiment of the present invention;
FIG. 3 is a block diagram of an adaptive interference filtering system according to an embodiment of the present invention;
FIG. 4 is a flowchart of a method for adaptive interference filtering according to a first embodiment of the present invention;
fig. 5 is a flowchart of a method for adaptive interference filtering according to a second embodiment of the present invention.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the embodiment of the invention, after the base station receives the channel access request message sent by the mobile station, the channel processor in the base station not only sends the decoding result of the burst access pulse in the channel access request message to the frame unit controller, but also sends the access delay value and the random access value of the burst access pulse, the frame number information (T1, T2, T3) and the received signal strength indication value in the channel access request message to the frame unit controller, and the frame unit controller adopts a plurality of judgment mechanisms to filter the interference signals according to the parameters.
Fig. 2 is a signaling flow diagram of adaptive interference filtering in an embodiment of the present invention, which includes the following steps:
in step 201, the mobile station 303 transmits a channel access request message to the base station 301.
In step 202, the base station 301 receives and records a Channel Access request message on a Random Access Channel (RACH).
In this step, after receiving the channel access request message once, the base station 301 performs recording once, and adds 1 to the number of times of recording.
In step 203, the base station 301 filters the received access request message.
In this step, the base station 301 determines whether the number of times of recording of the channel access request message is greater than or equal to a first predetermined value, and if so, checks the content of the channel access request message that has been recorded,
the inspection process is as follows:
if the access delay in the current channel access request message is less than or equal to the preset time advance, checking whether a first preset value of channel access request messages adjacent to the current channel access request message in time meet a filtering condition; and if the access delay in the current channel access request message is greater than the preset time advance, checking whether a second preset value of channel access request messages which are recorded adjacent to the current channel access request message in time meet the filtering condition.
The predetermined time advance is generally 35, the first predetermined value is generally 5, and the second predetermined value is generally 3, but other values may be selected according to actual conditions.
The filtration conditions were as follows:
if the random access value of the burst access pulse in the current channel access request message is the same as the random access value of the burst access pulse in the channel access request message adjacent to the current channel access request message in terms of time; and the difference between the frame number information T2 of the current channel access request message and the frame number information T2 of the channel access request message adjacent to the current channel access request message in time is less than the predetermined frame number information difference; and the difference value between the access delay value of the burst access pulse in the current channel access request message and the access delay value of the burst access pulse in the channel access request message adjacent to the current channel access request message in terms of time is less than the preset access delay difference value, so that the filtering condition is met and the filtering is carried out.
In this step, the difference value of the predetermined frame number information is 2, and the difference value of the predetermined access delay is 2, but other values may be selected according to the actual situation.
In step 204, the base station 301 sends a Channel Required (Channel Required) message to the base station controller 302 according to the access request message that is not filtered because it does not meet the filtering condition. (ii) a The base station 301 filters out the access request message meeting the filtering condition and sends an Error Report (Error Report) message to the base station controller 302.
In step 205, the frame unit controller within the base station 301 sends a message CHP DECREASE RX SENSITIVITY to the channel processor to reduce the SENSITIVITY of upstream reception.
In step 206, the frame unit controller in the base station 301 sends a message CHP receiver RX SENSITIVITY to RECOVER the SENSITIVITY of uplink reception to the channel processor.
Fig. 3 is a block diagram of an adaptive interference filtering system according to an embodiment of the present invention, which includes a base station 301, a base station controller 302, and an operation and maintenance Center Radio (OMC-R) 304, wherein,
the base station 301 is configured to receive and record the current channel access request message, and add 1 to the recording times; when the recording times of the channel access request message is less than a first preset value, sending a channel request message to the base station controller 302, recording the current channel access request message, and adding 1 to the recording times; and when the recording times of the channel access request message is greater than or equal to a first preset value, filtering the channel access request message according to the filtering condition, and sending a channel requirement message to the base station controller 302.
The base station 301 includes a channel processor 3011 and a frame unit controller 3012, wherein
The channel processor 3011 is configured to receive a channel access request message and forward the channel access request message to the frame unit controller 3012. Wherein the access request message includes an access delay and a random access value of the burst access burst, and frame number information (T1, T2, T3) and a received signal strength indication value in the channel access request message.
A frame unit controller 3012, configured to record and send a channel request message when the number of times of recording the channel access request message is less than a first predetermined value; when the recording times of the channel access request message are greater than or equal to a first preset value, filtering the channel access request message according to the filtering condition, and sending an error report message; and is further configured to send a first message to control the channel processor 3011 to decrease the uplink reception sensitivity, that is, to increase the RSSI value in the current channel access request message to be higher than the average RSSI value of all channel access request messages in the history record, and to increase a corresponding alarm after decreasing the uplink reception sensitivity each time. In addition, the frame unit controller 3012 is also configured to send a second message to control the channel processor 3011 to restore the sensitivity of uplink reception, and after restoring the sensitivity of uplink reception each time, forward the restoration message to the operation and maintenance center wireless section 304 through the base station controller 302.
The determining module 30121 determines whether the access delay of the current channel access request message is less than the predetermined time advance; judging whether the random access values of the current channel access request message and the channel access request message adjacent to the current channel access request message in time are the same, whether the difference value between the frame number information T2 is smaller than the difference value between the preset frame number information, and whether the difference value of the access delay is smaller than the preset access delay difference value; judging whether the number of the error report messages sent in the preset time exceeds the preset number of the error report messages;
a timing module 30122, configured to perform real-time monitoring on the error report message sent to the base station controller 302.
The first message is a message for reducing the sensitivity of uplink reception, and the first message carries an RSSI average value; the second message is a message for recovering the sensitivity of uplink reception.
Fig. 4 is a flowchart of a method for adaptive interference filtering in a base station system according to a first embodiment of the present invention, which includes the following steps:
In step 403, the base station directly sends a channel request message to the base station controller.
In step 406, the base station compares the current channel access request message with a first predetermined number of channel access request messages in the history record, which are adjacent to the recording time of the current channel access request message, and then proceeds to step 408.
In step 407, the base station compares the current channel access request message with a second predetermined number of channel access request messages in the history record, which are adjacent to the recording time of the current channel access request message, and then proceeds to step 408.
In steps 405 to 407, the predetermined time advance is generally 35, the first predetermined value is generally 5, and the second predetermined value is generally 3, but other values may be selected according to actual situations.
In this step, the difference value of the predetermined frame number information is 2, and the difference value of the predetermined access delay is 2, but other values may be selected according to the actual situation.
On the basis of the first embodiment, a second embodiment of the present invention is proposed to filter the interference signal by reducing the uplink reception sensitivity.
Fig. 5 is a flowchart of a method for adaptive interference filtering in a base station system according to a second embodiment of the present invention, which includes the following steps:
in step 501, the frame unit controller controls the channel processor to decrease the uplink receiving sensitivity by sending a message to decrease the uplink receiving sensitivity, and then the process goes to step 502.
In this step, the channel processor increases the RSSI value in the current channel access request message to be above the average of the RSSI values of all channel access request messages in the history.
In this step, the timer is set to 15 minutes, but of course, other values may be selected according to actual situations.
And 505, after the uplink receiving sensitivity is recovered, the frame unit controller sends a recovery message to the wireless part of the operation and maintenance center.
In step 506, the frame unit controller terminates the timer that is counting, and returns to step 501.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A method for filtering an interference signal, comprising the steps of:
receiving and recording a channel access request message;
when the recording times of the channel access request message are greater than or equal to a first preset value, filtering the channel access request message according to the filtering condition, and sending an error report message; wherein,
the channel access request message comprises a current channel access request message and a channel access request message adjacent to the current channel access request message in time;
the current channel access request message and the channel access request message which is adjacent to the current channel access request message in time comprise access delay, a random access value, frame number information and a received signal strength indication value.
2. The method of claim 1, further comprising:
and when the channel access request message recording times are less than a first preset value, sending a channel requirement message.
3. The method of claim 1, wherein the filtering conditions comprise:
judging whether the access delay of the current channel access request message is less than or equal to a preset time advance, if so, comparing the current channel access request message with a first preset value of channel access request messages adjacent to the current channel access request message in time; otherwise, the current channel access request message is compared with a second predetermined number of channel access request messages adjacent in time to the current channel access request message.
4. A method according to claim 1 or 3, wherein the method further comprises:
and when the random access values of the current channel access request message and the channel access request message adjacent to the current channel access request message in time are the same, the difference value between the frame number information is smaller than the difference value between the preset frame number information, and the difference value of the access delay is smaller than the preset access delay difference value, sending an error report message.
5. The method of claim 1, wherein the channel request message is transmitted when the random access value of the current channel access request message is different from the random access value of the channel access request message temporally adjacent to the current channel access request message, the difference between the frame number information is greater than or equal to the difference between the predetermined frame number information, and the difference of the access delay is greater than or equal to the predetermined access delay difference.
6. The method of claim 1, further comprising:
when the number of the error report messages sent in a preset time period exceeds the preset number of the error report messages, reducing the uplink receiving sensitivity;
and when the number of the error report messages sent in the preset time period is less than the preset number of the error report messages, recovering the uplink receiving sensitivity and sending a recovery message.
7. A base station for filtering an interference signal, comprising:
a channel processor for receiving a channel access request message;
the frame unit controller is used for recording and sending the channel request message when the recording times of the channel access request message is less than a first preset value; when the recording times of the channel access request message are greater than or equal to a first preset value, filtering the channel access request message according to the filtering condition, and sending an error report message; wherein,
the channel access request message comprises a current channel access request message and a channel access request message adjacent to the current channel access request message in time; the current channel access request message and the channel access request message adjacent to the current channel access request message in time comprise access delay, a random access value, frame number information and a received signal strength indication value.
8. The base station of claim 7, wherein the frame unit controller is further configured to control the channel processor to reduce uplink receive sensitivity, transmit a channel request message, recover uplink receive sensitivity, and transmit a recovery message.
9. The base station according to claim 7 or 8,
the frame unit controller further comprises a judging module and a timing module,
the judging module is used for judging whether the access delay of the current channel access request message is less than or equal to the preset time lead; judging whether the random access values of the current channel access request message and the channel access request message adjacent to the current channel access request message in time are the same, whether the difference value between the frame number information is smaller than the difference value between the preset frame number information, and whether the difference value of the access delay is smaller than the preset access delay difference value; judging whether the number of the error report messages sent in the preset time exceeds the preset number of the error report messages;
the timing module is used for monitoring the error report message in real time.
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| 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 |
| 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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| 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 |
| CN1992558A (en) * | 2005-12-29 | 2007-07-04 | 株式会社Ntt都科摩 | Radio communication system and radio communication method |
| EP1845628A1 (en) * | 2005-01-18 | 2007-10-17 | NTT DoCoMo Inc. | Mobile communication terminal, and multipath interference eliminating method |
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| CN1296683A (en) * | 1999-03-06 | 2001-05-23 | 松下电器产业株式会社 | Interference signal eliminator |
| 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 |
| EP1845628A1 (en) * | 2005-01-18 | 2007-10-17 | NTT DoCoMo Inc. | Mobile communication terminal, and multipath interference eliminating method |
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