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Physical layer interface system and method for a wireless communication system

  • US 7,209,455 B2
  • Filed: 11/29/2000
  • Issued: 04/24/2007
  • Est. Priority Date: 12/01/1999
  • Status: Expired due to Term
First Claim
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1. A physical layer interface system for a broadband wireless access communication network that establishes communication between a base station and a plurality of fixed subscriber stations over a radio link for multiplexing an upstream channel and a downstream channel, said downstream channel transporting downstream frames from the base station to the subscriber stations using a time division multiplexing (TDM) transmission protocol, and said upstream channel transporting upstream frames from the subscriber stations to the base station using a time division multiplexing access (TDMA) protocol, the physical layer interface system comprising:

  • a first physical layer interface at said base station for broadcasting over said downstream channel a continuous string of downlink frames to all subscriber stations, and for receiving from each currently active subscriber station a burst of uplink frames over said upstream channel; and

    a second physical layer interface at said subscriber station for transmitting a respective burst in an assigned time-slot allocated in said upstream channel and for extracting the downstream frames addressed to the respective subscriber station;

    wherein the downstream frames have a fixed length, including a synchronization byte and a configurable-length payload field; and

    wherein the upstream frames have a frame size programmable in predetermined time increments and the virtual frame boundaries are determined from a downstream frame start indicator.

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