Method and apparatus for controlling transmit diversity in a communication system
First Claim
1. A method of controlling transmit diversity in a communication system, the method comprising the steps of:
- transmitting common traffic channel information to a mobile station within a coverage area on a radio channel via spatially separated antennas;
receiving traffic channel information at the spatially separated antennas;
based upon measurements by a base station of signal characteristics of the mobile station, determining, at the base-station, whether a predetermined number of receiver RAKE fingers have been exceeded in the mobile station; and
enabling or disabling a transmission via at least one of the spatially separated antennas based on the receiver RAKE finger determination.
4 Assignments
0 Petitions
Accused Products
Abstract
Different orthogonal codes (Wx, Wy) are used to spread common pilot channels (PilotA) intended for transmission to a particular mobile station (106) within a coverage area (sector A) to implement forward link transmit diversity. The use of different orthogonal codes (Wx, Wy) for each pilot channel (PilotA) allows the mobile station (106) to discern which pilot channel spread with a different orthogonal code includes corresponding traffic channel (TCH) information. This allows forward link transmit diversity to be enable/disabled based on conditions associated with the environment, the communications channel, etc. without a complete loss of information as seen by the mobile station (106).
118 Citations
17 Claims
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1. A method of controlling transmit diversity in a communication system, the method comprising the steps of:
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transmitting common traffic channel information to a mobile station within a coverage area on a radio channel via spatially separated antennas; receiving traffic channel information at the spatially separated antennas; based upon measurements by a base station of signal characteristics of the mobile station, determining, at the base-station, whether a predetermined number of receiver RAKE fingers have been exceeded in the mobile station; and enabling or disabling a transmission via at least one of the spatially separated antennas based on the receiver RAKE finger determination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A base-station for controlling transmit diversity in a communication system, the base-station comprising:
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means for transmitting common traffic channel information to a mobile station within a coverage area on a radio channel via spatially separated antennas; means for receiving traffic channel information at the spatially separated antennas; based upon measurements by a base station of signal characteristics of the mobile station, means for determining, at the base-station, whether a predetermined number of receiver RAKE fingers have been exceeded in the mobile station; and
means for enabling or disabling a transmission via at least one of the spatially separated antennas based on the receiver RAKE finger determination . - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification