Method for frequency sharing and frequency punchout in frequency hopping communications network

  • US 5,515,369 A
  • Filed: 06/24/1994
  • Issued: 05/07/1996
  • Est. Priority Date: 06/24/1994
  • Status: Expired due to Term
First Claim
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1. In a communications network having a plurality of channel-agile nodes each node capable of transmitting and receiving data over a plurality of shared channels, said shared channels having a first order, a method for enabling a first node and a second node to follow a shared randomized channel-hopping band plan for transmissions to said first node while avoiding channels containing interference, comprising the steps of:

  • a) assigning to each node a unique seed value that can be used by a pseudo-random number generator to generate a list of channels in pseudo-random order;

    b) determining a channel punchout mask for each node, said channel mask indicating in said first order those channels on which that node experiences interference;

    c) at said first node, applying said first node'"'"'s channel mask to a first ordered channel list to eliminate channels on which said first node experiences interference thereby deriving a masked channel list for said first node;

    d) at said first node, determining a channel-hopping band plan for receiving transmissions to said first node by ordering the channels in said first node'"'"'s channel list according to a sequence generated by a pseudo-random number generator seeded with said first node'"'"'s seed value;

    e) transmitting from said first node to said second node an acquisition packet, said acquisition packet including said first node'"'"'s seed value and said first node'"'"'s channel mask;

    f) at said second node, applying said transmitted channel mask from said first node to said first ordered channel list to eliminate channels on which said first node experiences interference to obtain a masked channel list for said first node at said second node;

    g) at said second node, determining a channel-hopping band plan for transmissions to said first node by ordering the channels in said first node'"'"'s channel list according to a sequence generated by a pseudo-random number generator seeded with said first node'"'"'s transmitted seed value; and

    h) thereafter transmitting data to said first node from said second node according to said first node'"'"'s channel-hopping band plan.

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