Random access in a mobile telecommunications system

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

1997-04-30

2000-12-19

O'Neill, Michael

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

370515, H04B 7216

Patent

active

061635332

ABSTRACT:
A method, system, and apparatus assigns each sector in a cell a unique preamble spreading code and a unique long-code which is concatenated with a signature-associated short code to spread the data in the data field. The period selected for the long-code can be relatively long in duration (e.g., up to hours or days in length). The widths of the transmission time slots are set equal to the length of the preambles. Subsequent to the preamble period, the matched filter is still enabled to receive the preambles of other random access requests. Therefore, the matched filter can be utilized continuously and more efficiently. Additionally, the length of the data field is not restricted. The method of concatenated spreading of the data field portion of the random access packet allows a user to generate a packet which is as long as desired. Moreover, there is very little danger that the resulting packet will collide with other random access request packets.

REFERENCES:
patent: 5621752 (1997-04-01), Antonio et al.
patent: 5673260 (1997-09-01), Umeda et al.
EPO Search Report; File No. RS 99454US; Search Completed Oct. 20, 1997.

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