Random access in a mobile telecommunications system

Details Random access in a mobile telecommunications system Random access in a mobile telecommunications system

2006-01-10

2006-01-10

Nguyen, Brian (Department: 2661)

Multiplex communications

Communication over free space

Combining or distributing information via time channels

C370S337000, C370S344000, C455S522000

Reexamination Certificate

active

06985474

ABSTRACT:
A method for processing multiple random access requests is disclosed in which a base station transmits an acquisition indicator signal, which indicates that the base station has detected the presence of a random access transmission. The acquisition indicator can be generated based on the amount of energy received on the random access channel (e.g., as opposed to the correct/incorrect decoding of a random access message). Consequently, the delay between the beginning of the random access transmission and the beginning of the acquisition indicator transmission is significantly shorter than the delay to the beginning of an acknowledgment transmission based on the reception of a correctly decoded random access message. If a mobile station does not receive a positive acquisition indicator, it should interrupt the present transmission and start to re-transmit the random access burst in the next time slot, while modifying the transmission power level accordingly between the successive re-transmissions.

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Baier et al., “Design Study for a CDMA-Based Third-Generation Mobile Radio System”, May 1994, IEEE Journal on Selecetd Areas in Communications, pp. 733-743.

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