Directional handover control in digital mobile radio systems emp

Details Directional handover control in digital mobile radio systems emp Directional handover control in digital mobile radio systems emp

1992-03-23

1994-07-05

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

455 331, 455 541, 455 561, 379 60, H04B 100, H04B 700, H04M 1100

Patent

active

053275756

ABSTRACT:
A method of selecting handover targets for a communication unit exchanging a communicated signal through a serving base site in a digital cellular system. The method uses timing advance to determine a relative distance of a communication unit to the serving base site. The method comprising the steps of comparing a timing advance value with a first threshold. The first threshold may be equal to a distance one and one-half times the radius of the serving cell. When the timing advance value exceeds the first threshold, a base site frequency list is modified to include base sites non-adjacent the serving base site. The identity of the non-adjacent base sites may be determined from the directionality of the communication unit. The method further includes the step of selecting a handover target providing a highest relative RSSI value to the communication unit from the modified base site frequency list.

REFERENCES:
patent: 5038399 (1991-08-01), Bruckert
patent: 5179559 (1993-01-01), Crisler et al.

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