Media access control utilizing synchronization signaling

Details Media access control utilizing synchronization signaling Media access control utilizing synchronization signaling

2005-05-03

2005-05-03

Pezzlo, John (Department: 2662)

Multiplex communications

Communication over free space

Combining or distributing information via time channels

C370S445000, C370S459000, C370S510000, C713S400000

Reexamination Certificate

active

06888819

ABSTRACT:
A novel media access control (MAC) mechanism utilizing synchronization signaling that enables nodes from different networks having different technologies and protocols to coexistence using the same shared media. The present invention is suitable for use with a wide range of different types of network and technologies and is particularly useful in providing coexistence capabilities to powerline based data communication systems. Specific time slots are assigned for the transmission of a frame occupation signal to indicate to all nodes that the channel is occupied. A synchronization signal is randomly transmitted during a preassigned time slot within the frame to provide accurate timing for the frame occupation signal. During times that a node does not transmit the synchronization signal, it listens to the channel. A timing signal is derived from the synchronization signals received from other nodes during this quiet period wherein the node is in a listening mode. The node then adjusts its internal clock in accordance with the derived timing signal.

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