Enhanced access burst for random access channels in TDMA mobile

Details Enhanced access burst for random access channels in TDMA mobile Enhanced access burst for random access channels in TDMA mobile

1997-01-16

1999-02-23

Pham, Chi H.

Multiplex communications

Communication over free space

Repeater

370350, H04B 7212

Patent

active

058751823

ABSTRACT:
A spacecraft (12) cellular TDMA communications system (10) includes many user terminals (16), some of which may be movable. The spacecraft repeats transmissions by way of spot beams (20). A user initiates communication by synchronizing to the TDMA slots (210, 212), and transmits an access request signal. The access request signal is transmitted in at least two slots. The first slot contains time and frequency PN synch information, and the second slot contains one of (a) the user terminal's ID code and (b) a code representing the desired type of access. After this message is transmitted and received, the user terminal may transmit the PN synch information on a third slot, followed by the other one of the user terminal's ID code and the access-representative code.

REFERENCES:
patent: 4262356 (1981-04-01), Lautier et al.
patent: 5594780 (1997-01-01), Wiedeman et al.
patent: 5659545 (1997-08-01), Sowles et al.
patent: 5661724 (1997-08-01), Chennakeshu et al.
patent: 5663958 (1997-09-01), Ward
patent: 5717686 (1998-02-01), Schiavoni

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