Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1995-02-28
1998-04-07
Eisenzopf, Reinhard J.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455 62, 455 63, H04B 726, H04B 1702
Patent
active
057377057
ABSTRACT:
A method for improved frequency assignment includes recording communications events (130), for example handoff statistics, for subscriber units handing to and away from a base station (931). The handoff statistics include the IDs of the other base stations (932-937) involved in the handoff, preferably along with the date and time of the handoff. The statistics of the handoff count are applied based on the number of occurrences within a time period (140), and are used to accept or reject the potential frequency assignments obtained from an assignment process. In one embodiment of this process, using a Q estimate, obtained from residual powers recorded on each frequency (430-435), a candidate frequency is chosen based on the lowest Q value (440). This candidate is tested against the handoff statistics, and if rejected, a frequency with the next lowest Q level is tested (450-470). This process is repeated until a frequency is assigned.
REFERENCES:
patent: 5212831 (1993-05-01), Chuang et al.
patent: 5483666 (1996-01-01), Yamada et al.
patent: 5491837 (1996-02-01), Haartsen
J. C-I Chuang, "Autonomouds Adaptive Frequency Assignment for TDMA Portable Radio Systems", Fourth Nordic Seminar on Digital Mobile Radio Communications, Jun. 26-28, 1990, Oslo, Norway, Paper 9.2.
J. C-I Chuang, "Operation and Performance of a Self-Organizing Frequency Assignment Method for TDMA Portable Radio", IEEE Globecom '90, San Diego, CA, Dec. 2-5, 1990, pp. 1548-1552.
J. C-I Chuang, "Autonomous Frequency Assignment and Access for TDMA Personal Portable Radio Communications", IEEE VTC '91, St. Louis, MO, May 19-22, 1991.
Donald Cox and Douglas Reudink, "A Comparison of Some Channel Assignment Strategies in Large-Scale Mobile Communications Systems", IEEE Transactions on Communications, Apr. 1972, pp. 190-195.
"Appendix A--Automatic Port Frequency Assignment", JTC(AIR)/94.02.07-119R5, Aug. 25, 1994, pp. 209-211.
Reed John Douglas
Ruppel John Stephen
Eisenzopf Reinhard J.
Kincaid Lester G.
Motorola Inc.
Terry Bruce
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