Method and system for providing a handoff from a CDMA cellular telephone system
First Claim
1. A method for handoff of a mobile station from a code division multiple access (CDMA) portion of a cellular telecommunication system to a non-CDMA portion of the cellular telecommunication system, the method comprising the steps of:
- receiving, in the mobile station, a first CDMA pilot signal compatible with the CDMA portion of the cellular telecommunication system, the first CDMA pilot signal being transmitted from a CDMA transmitter in the non-CDMA portion of the cellular telecommunication system; and
directing a handoff of the mobile station from the CDMA portion of the cellular telecommunication system to the non-CDMA portion of the cellular telecommunication system as a function of the first CDMA pilot signal received by the mobile station.
2 Assignments
0 Petitions
Accused Products
Abstract
A mobile assisted handoff of a mobile station transitioning from a CDMA portion of a cellular telecommunication network to an analog portion of the network is provided as a function of a CDMA pilot signal transmitter located at each analog cell in the analog portion of the network. The mobile station monitors a CDMA pilot signal transmitted from each CDMA cell and each analog cell of the cellular telecommunication network, measures the signal strength of each received CDMA pilot signal and transmits the signal strength to the MTSO. The MTSO determines whether the pilot signal is associated with a CDMA base station or an analog base station. When the mobile station receives a pilot signal from an analog cell whose signal strength is above a first predetermined threshold and the received signal strengths of all pilot signals of the CDMA base stations with which the mobile station is currently in communication are below a second predetermined threshold, the MTSO directs a CDMA to analog handoff message to the mobile station.
83 Citations
13 Claims
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1. A method for handoff of a mobile station from a code division multiple access (CDMA) portion of a cellular telecommunication system to a non-CDMA portion of the cellular telecommunication system, the method comprising the steps of:
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receiving, in the mobile station, a first CDMA pilot signal compatible with the CDMA portion of the cellular telecommunication system, the first CDMA pilot signal being transmitted from a CDMA transmitter in the non-CDMA portion of the cellular telecommunication system; and directing a handoff of the mobile station from the CDMA portion of the cellular telecommunication system to the non-CDMA portion of the cellular telecommunication system as a function of the first CDMA pilot signal received by the mobile station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 13)
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9. A cellular telecommunication system providing cellular service to a mobile station, the cellular telecommunication system having a code division multiple access (CDMA) portion and a non-CDMA portion, comprising:
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a CDMA base station in the CDMA portion of the cellular telecommunication system; a first CDMA pilot signal transmitter associated with the CDMA base station for transmitting a unique first CDMA pilot signal, the first CDMA pilot signal transmitter being in the CDMA portion of the cellular telecommunication system; a non-CDMA base station in the non-CDMA portion of the cellular telecommunication system; a second CDMA pilot signal transmitter associated with the non-CDMA base station for transmitting a unique second CDMA pilot signal, the second CDMA pilot signal transmitter being in the non-CDMA portion of the cellular telecommunication system; and a controller in communication with the CDMA base station and the non-CDMA base station, wherein the controller provides for a handoff of the mobile station from the CDMA portion of the cellular telecommunication system to the non-CDMA portion of the cellular telecommunication system as a function of the unique first CDMA pilot signal and the unique second CDMA pilot signal. - View Dependent Claims (10, 11, 12)
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Specification