Patent ID: 7450943

Claim:
A method of switching a terminal from a first wireless cdma communication system to a second cdma wireless communication system, comprising: obtaining at least one measurement of at least one parameter for at least one base station in the first cdma communication system; deriving a metric based on the at least one measurement; determining whether or not the terminal is within coverage of the first cdma communication system based on the metric; and initiating a switch to the second cdma communication system if the terminal is deemed to be outside the coverage of the first cdma communication system, wherein said metric is derived using one of the following formulae: (a) metric=Sum of E C /I 0 of all pilots in the active and candidate sets and Max {E C /I 0 of pilots inthe neighbor sets}, wherein said E C represents energy-per-chip, and I 0 represents noise and interference, (b) metric=Sum of E C /I 0 of all pilots in the active set and Max {E C /I 0 of pilots in the candidate and neighbor sets}, wherein said E C represents energy-per-chip, and I 0 represents noise and interference, (c) metric=Max {sum of E C /I 0 of pilots in the active set, E C /I 0 of pilots in the candidate and neighbor sets}, wherein said E C represents energy-per-chip, and I 0 represents noise and interference, and (d) metric=Max {E C /I 0 of pilots in the active, candidate and neighbor sets}, wherein said E C represents energy-per-chip, and I 0 represents noise and interference.