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    • 8. 发明公开
    • A LOCAL AREA COMMUNICATION NETWORK.
    • 本地网络连接受限。
    • EP0086223A4
    • 1984-03-01
    • EP82902850
    • 1982-08-17
    • TOBAGI FOUAD AFRATTA LUIGIBORGONOVO FLAMINIO
    • TOBAGI FOUAD A
    • H04Q11/04H04L12/417H04J6/00
    • H04L12/40156H04L12/4013H04L12/417H04L12/43
    • A local area communication network based upon a broadcast communication system comprising an inbound channel (20) and an outbound channel (21), a plurality of stations (S1-SN) connected to both the inbound and the outbound channels, transmitting on the outbound channel (21) which utilizes an access protocol where the access protocol used by the stations (S1-SN) connected to the bus is a distributed algorithm and is based upon a conflict-free round robin (RR) access scheme. The time required to switch from one active user to the next in a round is minimized (on the order of carrier detection time) and is independent of the end-to-end network propagation delay. This improvement is particularly significant when the channel data rate is so high, or the end-to-end propagation delay is so large, or the packet size is so small as to render the end-to-end propagation delay a significant fraction of, or larger than, the transmission time of a packet. Moreover, some features of the present invention make it particularly suitable for voice applications. In view of integrating voice and data, a voice/data protocol is described which allows it to meet the bandwidth requirement and maximum packet delay constraint for voice communication at all times, while guaranteeing a minimum bandwidth requirement for data traffic. The voice/data protocol constitutes a highly adaptive allocation scheme of channel bandwidth, which allows data users to steal the bandwidth unused by the voice application.