U.S. Philips Corporation

Marouane Berrada

Americo Brajal

Heba Koraitim

A communication protocol for use by stations in multiple access telecommunication network wherein communication between stations is via a master station. An upstream channel to the master station is shared by the other stations and has successive frames each consisting of K message slots, each message slot including a data part (DM) for the transmission of a message and M minislots for transmission of slot reservation signals. According to the invention, in case of unsuccessful message transmission and collision between transmission requests, reservation signals for retransmission of a message can be transmitted in any of the K.times.M minislots of each entire frame. The large number of minislots thereby made available reduces the danger of collision between retransmission requests.

Transmission control method between a plurality of stations

A communication protocol is disclosed where unsuccessful transmissions between stations are reduced. Each station includes a first queue for receiving newly generated messages and a second queue for receiving recycled messages which were not successfully transmitted. A detector in a reception sub-assembly of each station detects that the number of unsuccessful transmissions or collisions exceeds a predetermined threshold. Until the collisions are solved, a recycling circuit recycles the collided messages by providing them to the second queue and increasing their transmission priority over any newly generated messages contained in the first queue.

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Saint Maur des Fosses, France

Marouane Berrada