Mobile assisted handover using CDMA
First Claim
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1. A method of mobile-assisted handover in a wireless network comprising:
- communicating with a mobile station from a first base station;
receiving, at a network controller, one or more data messages sent from said mobile station to said first base station that indicate relative signal strengths of at least a second base station operating on a same frequency as said first base station;
determining, by said network controller, to handover said mobile station from said first base station to said second base station based on said signal strengths; and
handing over said mobile station from said first base station to said second base station based on said determination by said network controller;
wherein said mobile station communicates with said first base station using a first CDMA spreading code before and during handover, and wherein said mobile station communicates with said second base station using a second CDMA spreading code during and after handover; and
sending a control message from said first base station to said mobile station that identifies said second CDMA spreading code to support handover of said mobile station.
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Abstract
A method and system for facilitating handover in mobile radio communication systems are illustrated. The mobile unit assists in making handover decisions by monitoring the signal strength of control channels transmitted by base stations in neighboring cells. During the handover, the mobile station can receive the same information from and/or transmit the same information to a plurality of base stations to provide diversity combination and improve transmission quality.
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Citations
16 Claims
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1. A method of mobile-assisted handover in a wireless network comprising:
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communicating with a mobile station from a first base station; receiving, at a network controller, one or more data messages sent from said mobile station to said first base station that indicate relative signal strengths of at least a second base station operating on a same frequency as said first base station; determining, by said network controller, to handover said mobile station from said first base station to said second base station based on said signal strengths; and handing over said mobile station from said first base station to said second base station based on said determination by said network controller; wherein said mobile station communicates with said first base station using a first CDMA spreading code before and during handover, and wherein said mobile station communicates with said second base station using a second CDMA spreading code during and after handover; and sending a control message from said first base station to said mobile station that identifies said second CDMA spreading code to support handover of said mobile station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification