Telecommunications – Transmitter and receiver at separate stations
Patent
1996-01-18
1998-05-19
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
455 334, 455 561, 379 60, H04Q 738
Patent
active
057549451
ABSTRACT:
In a cellular radio communications system, handoff of a mobile terminal from a serving base station to an adjacent base station is performed using two separate fuzzy logic procedures for handoff triggering and handoff targeting. For triggering, inputs to the fuzzy logic procedure are the signal strength for communications with the serving base station, a time since a failure to complete execution of a handoff, and, for mobile-assisted handoff (MAHO), signal strengths of communications between the mobile terminal and each of the adjacent base stations. If handoff is triggered, then handoff targeting is performed at a central unit. For targeting, inputs to the fuzzy logic procedure are the monitored signal strengths between the mobile terminal and each of the adjacent base stations, supplied either from the mobile terminal using MAHO or from the base stations, and the current loads of the adjacent base stations. The targeting determines preferences for handoff of the mobile terminal to the different adjacent base stations, handoff then being executed in accordance with these preferences.
REFERENCES:
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patent: 5596625 (1997-01-01), LeBlanc
"A New Hand-Off Algorithm Using Fuzzy Logic", G. Edwards et al., IEEE Proceedings of Southeastcon '94, New York 1994, pp. 89-92.
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"Advanced Handoff Control Using Fuzzy Interference for Indoor Radio System", Y.Kinoshita et al., Proc.of 1993 IEEE Vehicular Technology Conference, New York 1993, pp. 649-653.
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Pattern Recognition Techniques in Handoff and Service Area Determination, H.Maturino-Lozoya et al., IEEE 1994, pp.96-100.
Lin Jing-Yue
Zhang Chang-Gang
Zhao Hong
Eisenzopf Reinhard J.
Haley R. John
Le Thanh
Northern Telecom Limited
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