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Method and apparatus for co-channel interference measurements and base station color code decoding for drive tests in TDMA, cellular, and PCS networks
| Details |
Inventors: Kline, Paul A.; Dickey, Sergey L.;
Assignee: Dynamic Telecommunications, Inc. (Germantown, MD)
Primary Examiner: Nguyen; Lee
Assistant Examiner: Pan; Yuwen
Attorney, Agent or Firm: Roberts Abokhair & Mardula LLC
Co-channel interference in a wireless network is identified and quantified. Rather that using color code identification, a more reliable identification property of each co-channel component of the received composite signal is used, namely, the time of arrival of a known part of a signal. Detection and timing measurement is performed even in presence of stronger signals by focusing selectively on bursts having fixed contents (e.g., the FCCH burst used in GSM for frequency correction). The repetitive measurements of the time-of-arrival of each of the interfering components of the signal during a drive test enables determination of the geographical location of the interfering co-channel base stations. |
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DETAILED DESCRIPTION Co-channel interference in a wireless network is identified and quantified.
Rather that using color code identification, a more reliable identification property of each co-channel component of the received composite signal is used, namely, the time of arrival of a known part of a signal.
Detection and timing measurement is performed even in presence of stronger signals by focusing selectively on bursts having fixed contents (e.
g.
, the FCCH burst used in GSM for frequency correction).
The repetitive measurements of the time-of-arrival of each of the interfering components of the signal during a drive test enables determination of the geographical location of the interfering co-channel base stations.
It is an object of the present invention to provide the method and apparatus suitable for the measurement and unequivocal identification of several interfering co-channel signals with high reliability and completeness, and which would not require frequent use of processing-intensive and inefficient joint detection algorithms.
It is another object of the present invention to provide geographical locations of the identified sources of co-channel interference.
It is still another object of the present invention to provide a complete coverage of color-code information of the identified co-channel interfering signals without the need to carry out complex joint decoding of interference at every measurement point.
The present invention achieves the above objects by substituting for the color code a more reliable identification property of each co-channel "component" of the composite signal, namely, the time of arrival of a known part of a signal.
As an example, in the GSM signal, one of the TDMA bursts has fixed contents and normally is used for frequency correction ("FCCH" burst).
Since it consists of a long piece of a fixed signal (147-bit-long piece of a sine wave of fixed frequency), its detection provides a processing gain of more than 20 dB, and therefore the detection and timing measurement can be performed even in presence of stronger signals
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Ring Tones 
