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US 2014/0233486 A1Published application
Method and apparatus for random access channel probe initialization using transmit diversity
AssigneeGoogle Inc.
InventorsKenneth KLUDT, Haim HAREL, Phil F. CHEN, Sherwin J. WANG
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Abstract
Embodiments of the present invention may separately utilize transmit paths of a mobile transmit diversity device to initialize communication with a base station over a random access channel, particularly where the transmit paths have power amplifiers with different characteristics, e.g., different power amplification.
Claims20
A method of initiating communication between a mobile communication device and a second communication device comprising:
- transmitting from the mobile communication device at least a first probe signal on a random access channel using only a first transmit path of the mobile communication device, said first transmit path including a low power amplifier;
- and
- if acknowledgement is not received from the second communication device in response to said first probe signal, then transmitting from the mobile communication device at least a second probe signal on a random access channel using only a second transmit path of the mobile communication device, said second transmit path including a high power amplifier.
A mobile communication device comprising:
- a first transmit path, said first transmit path including at least a first antenna, and a low power amplifier operable to amplify a transmit signal for transmission by the first antenna at a low power;
- a second transmit path, said second transmit path including at least a second antenna, and a high power amplifier operable to amplify a transmit signal for transmission by the second antenna at a high power;
- a processor to:
- transmit at least a first probe signal on a random access channel using only the first transmit path using the low power amplifier;
- and
- if acknowledgement is not received from a second communication device in response to said first probe signal, then transmit at least a second probe signal on a random access channel using only the second transmit path using the high power amplifier.
3 more elements
Dependencies are inferred from the claim text.