Method and apparatus for establishing communication in a multi-t

Details Method and apparatus for establishing communication in a multi-t Method and apparatus for establishing communication in a multi-t

1995-02-28

1996-09-17

Chin, Wellington

Multiplex communications

Wide area network

Packet switching

370124, H04J 102

Patent

active

055576125

ABSTRACT:
Apparatus and methods for informing the central unit of the transmission requirements of a remote unit in a bi-directional data transmission system that facilitates communications between a central unit and a plurality of remote units using a frame based discrete multi-tone (DMT) transmission scheme. The method includes the step of transmitting, using a fast access transmission mode, a communication access request from a selected first remote unit to the central unit during any symbol period. The communication access request includes a unique remote unit identifier associated with the selected first remote unit and is transmitted from the selected first remote unit on at least one unused sub-channel using a modulation scheme that does not require equalization to decode at the central unit. The method further includes the step of allocating at least one sub-channel to the selected first remote unit in response to the communication access request for facilitating upstream communications between the selected first remote unit and the central unit.

REFERENCES:
patent: 4314376 (1982-02-01), Williams
patent: 4601045 (1986-07-01), Lubarsky
patent: 4914651 (1990-04-01), Lusignan
patent: 5148272 (1992-09-01), Acampora et al.
patent: 5272700 (1993-12-01), Hansen et al.
patent: 5291289 (1994-03-01), Hulyalkar
patent: 5293633 (1994-03-01), Robbins
patent: 5471473 (1995-11-01), Tejima

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