초록 ▼

An improved method and system for performing a pilot signal searching operation in anticipation of handoff in mobile station communication between base stations is disclosed herein. The searching operation is described herein as being implemented within a cellular communication system which uses cod

An improved method and system for performing a pilot signal searching operation in anticipation of handoff in mobile station communication between base stations is disclosed herein. The searching operation is described herein as being implemented within a cellular communication system which uses code division multiple access (CDMA) modulation techniques. The mobile station maintains a list of an Active Set of pilot signals transmitted from base stations with which the mobile station is to communicate through, and a Neighbor Set of pilots from base stations within a predetermined proximity of the mobile station. In addition to the Neighbor and Active Sets of pilots, the mobile station maintains a list of Candidate and Pre-Candidate Sets of pilots. Based on analysis of the signal strength of the pilot signals received at the mobile station, base station entries from the Neighbor Set may be assigned to the Pre-Candidate and Candidate Sets, and eventually to the Active set. The searching operation contemplates comparing pilot signal strength measurements corresponding to each base station entry within the Neighbor Set to a first predetermined level. One or more entries from the Neighbor Set having a base station signal strength measurement greater than the first predetermined level may be placed in the Pre-Candidate Set. The strength of the pilot signals associated with entries in the Pre-Candidate Set are then further evaluated to determine eligibility within the Candidate Set, from which are selected the entries comprising the Active Set.

대표청구항 ▼

In a cellular communication system in which a mobile user communicates through a mobile station with other users via at least one base station included in an active list of one or more base station entries, wherein each of a plurality of base stations within said system transmit a unique pilot signa

In a cellular communication system in which a mobile user communicates through a mobile station with other users via at least one base station included in an active list of one or more base station entries, wherein each of a plurality of base stations within said system transmit a unique pilot signal, a method for identifying ones of said base stations from which received signal strength is sufficient to establish communication with said mobile station, said method comprising the steps of: maintaining in said mobile station a candidate list of base station entries, wherein each entry in said candidate list corresponds to a base station capable of providing sufficient signal strength to establish communication with said mobile station wherein said active list of one or more base station entries is maintained within said mobile station and is derived from said candidate list of base station entries; maintaining in said mobile station a neighbor list of base station entries, wherein each entry in said neighbor list corresponds to a base station in a predetermined proximity of said mobile station; measuring at said mobile station signal strength of each said pilot signal transmitted by each of said base stations in said neighbor list; comparing at said mobile station said base station signal strength measurements of each of said neighbor list entries to a first predetermined level; and removing by said mobile station a particular entry from said neighbor list having said base station signal strength measurement greater than said first predetermined level and placing said particular entry in a pre-candidate list maintained in said mobile station, wherein said entries in said pre-candidate list correspond to a set of base stations from which are derived said candidate list of base station entries.