Title of Invention

METHOD AND SYSTEM FOR LOCATING REVERSE LINK INTERFERENCE

Abstract

A method for locating reverse link interference includes: determining whether it is necessary to collect wireless signals according to a Received Signal Strength Indicator (RSSI) value, collecting wireless signal if it necessary to collect, converting the wireless signals collected into frequency-domain wireless signals, analyzing the frequency-domain wireless signals, and determining characteristics and class of an interfering source. A system and apparatus for locating reverse link interference are also provided. The method. s_\stem and apparatus of locating reverse link interference are able to implement automatic collection wireless signals and the automatic collection is not affected by circumstance and human factors, theorems' simplifying reverse link interference locating process and improving locating accuracy. Abstract A method for locating reverse link interference includes: determining whether it is necessary to collect wireless signals according to a Received Signal Strength Indicator (RSSI) value, collecting wireless signal if it necessary to collect, converting the wireless signals collected into frequency-domain wireless signals, analyzing the frequency-domain wireless signals, and determining characteristics and class of an interfering source. A system and apparatus for locating reverse link interference are also provided. The method. s_\stem and apparatus of locating reverse link interference are able to implement automatic collection wireless signals and the automatic collection is not affected by circumstance and human factors, theorems' simplifying reverse link interference locating process and improving locating accuracy.

Full Text

Method, System and Apparatus for Locating Reverse Link Interference Field of the Invention This invention relates to wireless communication technology, and particularly to a method. system and apparatus for locating reverse link interference at a wireless access system. Background of the invention Generally, wireless access system employs a plurality of frequency bands. For example. Code Division Multiple Access (CDMA) system employs 13 frequency bands and more than 140 sub-bands distributed from 400 M to 2100 M. Abundance of frequency bands allow the wireless access system to be applied widely, but meanwhile bring some problems. Due to particularity of radio resources, different countries employ different frequency distribution modes. Especially for the widely used 450M band, a variety of complex freq. entry distribution modes are used. Typically application examples in the 450M band include wireless intercom, data radio, analog wireless access, etc. As known to those skilled in the art, complex frequency distribution mode brings serious interferences to the wireless access system, and greatly affects applications of the wireless access system. For a CDMA system, serious reverse link interference may result in poor system performance and may cause several problems: 1) Difficult accessing for a user terminal. An existence of reverse link interference lowers reverse sensitivity, and shortens reverse covered distance, thus leads to a difficult accessing for a user terminal. 2) Unbalance of forward and reverse links, in which case the user terminal displays good signaling but is unable to implement a call. 3) Higher transmitting power needed by the user terminal, which leads to a higher power consumption and lower system capacity. 4) Call drop during a call. Therefore, detection and localization of reverse link interference is an important issue of much concern from the industry for a long time. At present, a commonly used method for detecting and locating reverse link interference is determining reverse link interference conditions of a current sector according to a Received Signal Strength indicator (RSSI) value recorded by the wireless access system. If the RSSI value is at a high level, the system may encounter serious reverse link interference; otherwise, the reverse link interference in the When the RSSI value recorded by the wireless access system is used to determine whether the system encounters serious reverse link interference, a special interference detector such as a spectrum analyzer is needed to collect wireless signals around the system, analyze the wireless signals collected and locate an interfering source. This kind of method for detecting and locating reverse link interference needs person participation and has several shortcomings: A. A long time should be spent in continuously collecting the wireless signals if the wireless circumstance is complex. In this case, it is difficult for a person to complete this task especially in an atrocious area such as an alpine station or a desert. B. If the location of the spectrum analyzer is not consistent with the location of system antenna, especially in a hilly or mountainous area, collecting wireless signals by using the interference detector manually may lead to a detection error, thereby increasing locating difficulty. As described above, the method for detecting and locating reverse link interference described above is difficult to be implemented, is easily affected by the circumstance and human factors, and has poor accuracy in reverse link interference detection and localization. Summary of the Invention A method, system and apparatus for locating reverse link interference are provided, in order to implement automatic collection of wireless signals and reduce the influence of circumstance and human factors. A method for locating reverse link interference may include: determining whether it is necessary to collect wireless signals according to a Received Signal Strength Indicator (RSSI) value; collecting wireless signals if necessary to collect, and converting the wireless signals collected into frequency-domain wireless signals; and analyzing the frequency-domain wireless signals, and determining characteristics and class of an interfering source. A system for locating reverse link interference may include: a wireless signal collecting entity, adapted to acquire an RSSI value of a current sector, collect wireless signals if necessary to collect wireless signals, convert the wireless signal collected into frequency-domain wireless signals, and send the frequency-domain wireless signals: and an interfering source locating entity, adapted to receive the frequency-domain wireless signals from the wireless signal collecting entity, analyze the frequency-domain w ireless signals. and determine characteristics and class of an interfering source. A wireless signal collecting entity may include: a sending and receiving board, adapted to acquire an RSSl value of a current sector, send the RSSI value to a control clock board, receive a signal collection instruction from the control clock board, collect wireless signals according to the signal collection instruction, convert the wireless signals collected into frequency-domain wireless signals, and send the frequency-domain wireless signals to the control clock board, and the control clock board adapted to receive the RSSl value from the sending and receiving board, send the signal collection instruction to the sending and receiving board, receive the frequency-domain wireless signals from the sending and receiving board, and send the frequency-domain wireless signals. A sending and receiving board may include: an RSSl value acquiring unit, adapted to acquire an RSSl value of a current sector, and send the RSSl value acquired, and a signal collecting unit, adapted to receive a signal collection instruction from a control clock board, collecting wireless signals according to the signal collection instruction, convert the wireless signals collected into frequency-domain wireless signals, and send the frequency-domain wireless signals to the control clock board. A control clock board may include: an RSSl value receiving unit, adapted to receive an RSSl value from a sending and receiving board, and send the RSSI value received, and a signal collection control unit, adapted to receive the RSSI value from the RSSI value receiving unit, determine whether it is necessary to collect wireless signals according to the RSSl value, send a signal collection instruction to the sending and receiving board if necessary to collect wireless signals, receive frequency-domain wireless signals from the sending and receiving board, and send the frequency-domain wireless signals received to an interfering source locating entity. According to an embodiment of this invention, when the system determines that a current sector has a serious reverse link interference according to an RSSl value received, the system automatically collects wireless signals, c overt the time-domain wireless signals into frequency-domain wireless signals, and analyzes the frequency-domain wireless signals to determine characteristics and class of a reverse link interfering source, thereby implementing automatic collection of wireless signals. This automatic collection reduces the influence of the circumstance and human factors to the greatest extent. Furthermore, by converting the time-domain wireless signals into frequency-domain wireless signals, the characteristics and class of the reverse link interfering source can be determined. Brief Description of the Drawings Figure I is a flowchart illustrating a method for locating reverse link interference according to an embodiment of the present invention; Figure 2 is a schematic illustrating a system for locating reverse link interference according to an embodiment of the present invention; and Failure 3 is a flowchart illustrating an embodiment for locating reverse link interference using a system shown in Figure 2. Detailed Description of the Invention The description is given as follows in conjunction with embodiments and accompanying drawings. According to an embodiment of the present invention, when it is necessary to collect wireless signals according to an acquired RSSI value, wireless signals are collected automatically. The collected wireless signals are time-domain wireless signals, and the time-domain wireless signals are converted into frequency-domain wireless signals. The frequency-domain wireless saunas are analyzed to determine characteristics and class of an interfering source. Figure 1 shows a flowchart illustrating a method for locating reverse link interference in accordance with an embodiment of this invention. In Figure I, the process includes the followings: Block 101: Determine whether it is necessary to collect wireless signals according to an acquired RSSI value. If necessary to collect wireless signals, perform Block 102. In this block, determining whether it is necessary to collect the wireless signals mat include followings. If the acquired RSSI value is greater than a signal collection start threshold, it is necessary to collect wireless signals; otherwise, it is not necessary to collect wireless signals. The signal collection start threshold represents a minimum value of the RSSI value according to which it is able to determine that serious reverse link interference is in a current sector. Block 102: Collect the wireless signals in the current wireless circumstance, and convert the collected time-domain wireless signals into frequency-domain wireless signals. In this block. Fast Fourier Transform (FFT) may be used to convert the collected time-domain wireless signals into frequency-domain wireless signals. In other embodiments-other methods for converting the collected time-domain wireless signals into frequency-domain wireless signals ma)' also be used. Block 103: Amazes the frequency-domain wireless signals, and determine characteristics and class of an interferential source. If a signal collection stop threshold is reconfigured. before Block 103. determine whether the acquired RSSI value is less than the signal collection stop threshold. If the acquired RSSI value is less than the signal collection stop threshold, stop collecting wireless signals; otherwise, return to Block 102. Ha signal collection stop time is reconfigured, before block 103, determine whether the signal collection stop time is reached or exceeded in the process of wireless signal collection. If the signal collection stop time has been reached or exceeded, stop collecting the wireless signals: otherwise, return to block 102. Figure 2 is a flowchart illustrating a system for locating reverse link interference in accordance with an embodiment of this invention. The system includes a wireless signal collecting entity and an interfering source locating entity. The wireless signal collecting entity is adapted to acquire an RSSI value of a current sector, collect wireless signals when it is necessary to collect wireless signals, convert the collected time-domain wireless signals into frequency-domain wireless signals, and send the frequency-domain wireless signals to the interfering source locating entity. The interfering source locating entity is adapted to receive the frequency-domain wireless signals trom the wireless signal collecting entity, analyze the received frequency-domain wireless signals, and determine characteristics and class of an interfering source according to the frequency-domain wireless signals. The wireless signal collecting entity may be further adapted to store the obtained frequency-domain wireless signals, and send the stored frequency-domain wireless signals to the interfering source locating entity when it is necessary to stop collecting wireless signals. The wireless signal collecting entity may be located in a base station; the interfering source locating entity may be a server having a function of locating an interfering source according to the frequency-domain wireless signals. As shown in Figure 2. the wireless signal collecting entity in this embodiment includes a sentinel and receiving board and a control clock board. The sending and receiving board is adapted to acquire an RSSI value of a current sector. . send the RSSI value to the control clock board; receive a signal collection instruction from the control clock board, collect wireless signals according to the signal collection instruction. convert- the collected time-domain wireless signals into frequency-domain wireless signals, and send the obtained frequency-domain wireless signals to the control clock board. The control clock board is adapted to receive the RSSI value from the sending and receiving board, and send a signal collection instruction to the sending and receiving board when it is necessary to collect wireless signals. The control clock board is also adapted to receive the frequency-domain wireless signals from the sending and receiving board, send the received frequency-domain wireless signals to the interfering source locating entity. The control clock board may be further adapted to compare the RSSI value with a signal collection stop threshold reconfigured, and determine whether it is necessary to stop collecting the wireless signals. If necessary to stop collecting the wireless signals, send to the sending and receiving board a stop instruction to stop collecting the wireless signals collection. The control clock board may be further adapted to determine whether a signal collection stop time is reached or exceeded. If the signal collection stop time is reached or exceeded, the control clock board sends to the sending and receiving board a stop instruction to stop collecting the wireless signals. The sending and receiving board may be further adapted to receive the stop instruction from the control clock board, and stop collecting the wireless signals. The control clock board may be further adapted to store the frequency-domain wireless signals sent by the sending and receiving board, and send the stored frequency-domain wireless signals to the interfering source locating entity if necessary to stop collecting the wireless signals Also as shown in Figure2, the sending and receiving board includes an RSSI value acquiring unit and a signal collecting unit. The RSSI value acquiring unit is adapted to acquire an RSSI value of a current sector, and send the acquired RSSI value to the control clock board. The signal collecting unit is adapted to receive a signal collection instruction from the control clock board, collect wireless signals according to the signal collection instruction, convert the acquired time-domain wireless signals into frequency-domain wireless signals, and send the obtained frequency-domain wireless signals to the control clock board. The signal collecting unit may be further adapted to receive a stop instruction from the control clock board, and stop collecting wireless signals. The control clock board includes an RSSI value receiving unit and a signal collection control unit. The RSSI value receiving unit is adapted to receive the RSSI value from the sending and receiving board, and send the received RSSI value to the signal collection control unit. The signal collection control unit is adapted to receive the RSSI value from the RSSI value receiving unit, and send a signal collection instruction to the signal collecting unit in the sending and receiving unit if necessary to collect wireless signals. The signal collection control unit is also adapted to receive the frequency-domain wireless signals from the sending and receiving board, and send the received frequency-domain wireless signals to the interfering source locating entity. The signal collection control unit may be further adapted to compare the RSSI value from the RSSI value acquiring unit with a signal collection stop threshold precontlgured, and send a stop instruction to the signal collecting unit of the sending and receiving board if necessary to stop collecting the wireless signals. The signal collection control unit may be further adapted to send a stop instruction to the signal collecting unit of the sending and receiving board if a signal collection stop time reconfigured is reached or exceeded. The control clock board may also further include a storage unit adapted to store the frequency-domain wireless signals sent by the signal collection control unit. The signal collection control unit may be further adapted to send the frequency-domain wireless signals stored in the stories unit to the interfering source location entity if necessary to stop collecting the wireless signals. Figure 3 shows a flowchart illustrating an embodiment for locating reverse link interference using a system shown in Figure 2. This embodiment may include the followings: Block 301: A sending and receiving board sends an RSSI value of a current sector to a control clock board. In this block, the sending and receiving board may acquire RSSI values of the current sector potently, and send RSSI values acquired to the control clock board. The sending and receiving board may also acquire RSSI values of the current sector at intervals, and send the RSSI values to the control clock board. Block 302: The control clock board determines whether the sending and receiving board is collecting wireless signals. If the sending and receiving board is collecting wireless signals. block 303 is performed; otherwise, block 306 is performed. The control clock board may control the sending and receiving board to collect the wireless signals upon power-on. or control the sending and receiving board to collect the wireless signals when a serious interference exists in the current sector according to the RSSI value sent by the sending and receiving board. Block 303: The control clock board determines whether the currently received RSSI value is greater than a signal collection start threshold preconfigured. If the currently received RSSI value is greater than the signal collection start threshold preconfigured, block 304 is performed; otherwise, no special process is performed. Block 304: The control clock board controls the sending and receiving board to collect wireless signals. Block 305: After receiving a message from the control clock board for collecting wireless signals, the sending and receiving board collects in-band signals at a reverse frequency point, converts the collected time-domain wireless signals into frequency-domain wireless signals using FFT and sends the frequency-domain wireless signals to the control clock board. The control clock board stores the received frequency-domain wireless signals. Block 306: The control clock board determines whether the currently received RSSI value is less than a signal collection stop threshold preconfigured or whether a signal collection stop time preconfigured is reached or exceeded. If the currently received RSSI value is less than the preconfigured signal collection stop threshold or the signal collection stop time preconfigured is reached or exceeded, block 307 is performed; otherwise, block 305 is performed. Block 307: The control clock board controls the sending and receiving board to stop collecting wireless signals, and sends the stored frequency-domain wireless signals to the interfering source locating entity. In CDMA2000. the control clock board may send the stored frequency-domain wireless signals to the interfering source locating entity via an Axis link. Block 308: The interfering source locating entity analyzes the received frequency-domain wireless signals, and determines characteristics and class of the interfering source. According to embodiments of this invention, the wireless signal collecting entity may be located in a base station, and the interfering source locating entity may be a server having a function of locating an interfering source according to the frequency-domain wireless signals. The method and system for locating reverse link interference, and the entity and apparatus for collecting wireless signals are applicable to all wireless communication systems, such as CDMA system. CDMA2000 system. Wideband Code Division Multiple Access (WCDMA) system. Global System for Mobile Communications (GSM), Time Division-Synchronous CDMA (TD-SCDMA) system. The previous description of the disclosed embodiments is provided to enable those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art and generic principles defined herein may be applied to other embodiments without departing from the scope of the invention. Thus, the present invention is not limited to the embodiments shown herein but is to be accorded with the widest scope consistent with the principles and features disclosed herein. 1. A method for locating reverse link interference, comprising: determining whether it is necessary to collect wireless signals according to a Received Signal Strength Indicator (RSSI) value: collecting wireless signals if necessary to collect wireless signals, and converting the wireless signals collected into frequency-domain wireless signals; and analyzing the frequency-domain wireless signals, and determining characteristics and class of an interfering source, 2. The method of claim K wherein the determining: whether it is necessary to collect wireless signals according to the RSSI value comprises: if the RSSI value is greater than a signal collection start threshold, determining that it is necessary to collect wireless signals. 3. The method of claim I or 2. further comprising: determining whether the RSSI value is less than a signal collection stop threshold: and stopping collecting the wireless signals if the RSSI value is less than the signal collection stop threshold. 4. The method of Claim I or 2. further comprising: determining whether a sigma I collection stop time is reached or exceeded: and stopping collecting the wireless signals if the signal collection stop time is reached or exceeded. 5. The method of claim I or 2, wherein the converting the wireless signals collected into frequency-domain wireless signals comprises: converting the wireless signals collected into frequency-domain wireless signals using Fast Fourier Transform (FFT). 6. A system for locating reverse link interference, comprising: a wireless signal collecting entity, adapted to acquire a Received Signal Strength Indicator (RSSI) value of a current sector, collect wireless signals if necessary to collect wireless signals, convert the wireless signal collected into frequency-domain wireless signals, and send the frequency-domain wireless signals; and an interfering source locating entity, adapted to receive the frequency-domain wireless signals from the wireless signal collecting entity, analyze the frequency-domain wireless signals. and determine characteristics and class of an interfering source. 7. The system of claim 6, wherein the wireless signal collecting entity\' comprises a storage unit adapted to store the frequency-domain wireless signals and send the frequency-domain wireless signals to the interfering source locating entity if necessary to stop colleting wireless signals. 8. The system of claim 6 or 7. wherein the wireless signal collecting entity_\' is located in a base station and the interfering source locating entity comprises a function adapted to locale an interfering source according to the frequency-domain wireless signals. 9. A wireless signal collecting entity, comprising: a sending and receiving board, adapted to acquire a Received Signal Strength judicator (RSSI) value of a current sector, send the Russo value to a control clock board, receive a signal collection instruction from the control clock board, collect wireless signals accordions to the signal collection instruction, convert the wireless signals collected into frequency-domain wireless signals, and send the frequency-domain wireless signals to the control clock board; and the control clock board adapted to receive the RSSI value from the sending and receiving board, send the signal collection instruction to the sending and receiving board, receive the frequency-domain wireless signals from the sending and receiving board, and send the frequency-domain wireless signals. 10. The wireless signal collecting entity of claim 9, wherein the control clock board comprises a first unit adapted to compare the RSSI value sent by the sending and receiving board with a signal collection stop threshold and send a stop instruction to the sending and receiving board if the RSSI value is less than the signal collection stop threshold: and the sending and receiving board comprises a second unit adapted to receive the slop instruction from the control clock board and stop collecting wireless signals. 11. The wireless signal collecting entity of claim 9. wherein the control clock board comprises a third unit adapted to determine whether a signal collection stop time is reached or exceeded, and send a stop instruction to the sending and receiving board if the sigma I collection stop time is reached or exceeded; and the sending and receiving board comprises a fourth unit adapted to receive the stop instruction from the control clock board and stop collecting wireless signals., 12. The system of claim 10 or 11. wherein the wireless signal collecting entity further comprises a storage unit adapted to store the frequency-domain wireless signals sent the sending and receiving board and send the frequency-domain wireless signals when it is necessary to stop collecting wireless signals. 13. A sending and receiving board, comprising: a Received Signal Strength Indicator (RSSI) value acquiring unit, adapted to acquire an RSSI value of a current sector, and send the RSSI value; and a signal collecting unit, adapted to receive a signal collection instruction from a control clock board, collect wireless signals according to the signal collection instruction, convert the wireless signals collected into frequency-domain wireless signals, and send the frequency-domain wireless signals to the control clock board. 14. The sending and receiving board of claim 13, wherein the signal collecting unit is further adapted to receive a stop instruction from the control clock board and stop collecting wireless signals. 15. A control clock board, comprising: a Received Signal Strength Indicator (RSSI) value receiving unit, adapted to receive an RSSI value from a sending and receiving board and send the RSSI value; and a signal collection control unit, adapted to receive the RSSI value from the RSSI value receiving unit, determine whether it is necessary to collect wireless signals according to the RSSI value, send a signal collection instruction to the sending and receivers board if necessary to collect wireless signals, receive frequency-domain wireless signals from the sending and receiving board, and send the frequency-domain wireless signal received to an interfering source locating entity. 16. The control clock board of claim 15, wherein the signal collection control unit comprises a first unit adapted to compare the RSSI value sent by the sending and receiving board with a signal collection stop threshold and send a stop instruction to the sending and receiving board if the RSSI value is less than the signal collection stop threshold. 17. The control clock board of claim 15, wherein the signal collection control unit comprises a second unit adapted to determine whether a sigma collection stop time is reached or exceeded and s end a stop instruction to the sending and receiving board if the signal collection stop time is reached or exceeded. 18. The control clock board of claim 16 or 17, further comprising a storage unit adapted to store frequency-domain wireless signals sent by the signal collection control unit, and wherein the signal collection control unit further comprises a third unit adapted to obtain the frequency-domain wireless signals stored in the storage unit and send the frequency-domain wireless signals to the interfering source locating entity.

Documents:

3022-CHE-2007 AMENDED CLAIMS 11-02-2013.pdf

3022-CHE-2007 AMENDED PAGES OF SPECIFICATION 11-02-2013.pdf

3022-CHE-2007 CORRESPONDENCE OTHERS 08-08-2013.pdf

3022-CHE-2007 EXAMINATION REPORT REPLY RECEIVED 11-02-2013.pdf

3022-CHE-2007 EXAMINATION REPORT REPLY RECEIVED 18-09-2013.pdf

3022-CHE-2007 FORM-1 11-02-2013.pdf

3022-CHE-2007 FORM-13 18-09-2013.pdf

3022-CHE-2007 FORM-3 08-08-2013.pdf

3022-CHE-2007 POWER OF ATTORNEY 11-02-2013.pdf

3022-CHE-2007 CORRESPONDENCE OTHERS 20-01-2012.pdf

3022-che-2007-abstract.pdf

3022-che-2007-claims.pdf

3022-che-2007-correspondnece-others.pdf

3022-che-2007-description(complete).pdf

3022-che-2007-drawings.pdf

3022-che-2007-form 1.pdf

3022-che-2007-form 18.pdf

3022-che-2007-form 26.pdf

3022-che-2007-form 3.pdf

3022-che-2007-form 5.pdf