Method of optimizing neighbor set during soft handoff of a mobil

Details Method of optimizing neighbor set during soft handoff of a mobil Method of optimizing neighbor set during soft handoff of a mobil

1996-10-28

1999-08-31

Dollnar, Andrew M.

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

455442, 370332, H04Q 722

Patent

active

059466219

ABSTRACT:
System and method for optimally updating a neighbor set for use by a mobile unit during soft handoff of the mobile unit in a CDMA cellular telephone environment is disclosed. A two-step process is used to ensure that the individual neighbor sets of active set members are combined in a manner such that only pilots representing the more important sectors are included in the updated neighbor set and pilots representing the less important sectors are excluded therefrom. In the first step, active set members whose RTD is more than twice as great as an OWD threshold are eliminated from consideration. In the second step, the neighbor set of the mobile unit is updated using the sectors included in the individual neighbor sets of the active set members that were not excluded by the first step, wherein those sectors are included in the updated neighbor set according to the number of individual sets in which they are found and their priority within those sets. In an alternative embodiment, a combined carrier-to-interference ratio for each of the individual neighbor set members is also used in updating the neighbor set. In an alternative embodiment, the individual neighbor set of the active set member having the shortest RTD is used as the updated neighbor set.

REFERENCES:
patent: 5390339 (1995-02-01), Bruckert et al.
patent: 5577022 (1996-11-01), Padovani et al.

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