METHOD AND APPARATUS FOR RANDOM ACCESS CHANNEL PROBE INITIALIZATION USING TRANSMIT DIVERSITY
First Claim
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1. A method of initiating communication between a first communication device and a second communication device comprising:
- transmitting from the first communication device a first probe signal on a random access channel using at least two antennas, wherein transmissions of the first probe signal on the two antennas differ by a first value of a transmit diversity parameter; and
if acknowledgement is not received from the second communication device, then transmitting from the first communication device a second probe signal on a random access channel using at least two antennas, wherein transmissions of the second probe signal on the two antennas differ by a second value of the transmit diversity parameter.
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Abstract
Embodiments of the present invention extend the benefits of mobile transmit diversity to the initialization phase of communication with a base station over a random access channel. According to a method of the invention, the transmitter may attempt to initiate communication with a receiver by varying a transmit diversity parameter, for example, phase difference, in addition to or instead of varying power settings.
37 Citations
20 Claims
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1. A method of initiating communication between a first communication device and a second communication device comprising:
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transmitting from the first communication device a first probe signal on a random access channel using at least two antennas, wherein transmissions of the first probe signal on the two antennas differ by a first value of a transmit diversity parameter; and if acknowledgement is not received from the second communication device, then transmitting from the first communication device a second probe signal on a random access channel using at least two antennas, wherein transmissions of the second probe signal on the two antennas differ by a second value of the transmit diversity parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A mobile communication device comprising:
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first and second antennas; and a processor to; transmit on the first and second antennas a first probe signal on a random access channel, wherein transmissions of the first probe signal on the first and second antennas differ by a first value of a transmit diversity parameter, and if acknowledgement is not received from a second communication device, transmit on the first and second antennas a second probe signal on a random access channel, wherein transmissions of the second probe signal on the first and second antennas differ by a second value of the transmit diversity parameter. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification