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US 8,046,017 B2Granted
Method and apparatus for random access channel probe initialization using transmit diversity
AssigneeMagnolia Broadband Inc.
InventorsKenneth Kludt, Sherwin J. Wang
Life of this patent
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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.
Claims20
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.
A mobile communication device comprising:
- 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.
2 more elements
Dependencies are inferred from the claim text.