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Co-located subscriber unit to subscriber unit communication within a satellite communication system

  • US 5,737,685 A
  • Filed: 12/20/1995
  • Issued: 04/07/1998
  • Est. Priority Date: 02/25/1992
  • Status: Expired due to Term
First Claim
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1. In a satellite communication system having a predetermined number of communication satellites arranged in orbit around the earth such that a plurality of subscriber units and at least one earth based unit can communicate via the satellites,a geographically co-located user assignment system for facilitating a push-to-talk communication mode for communication among a designated group of subscriber units that are geographically co-located, the assignment system comprising:

  • an assignment unit for assignment of a same frequency and channel among a plurality of multiple-access channels to a group of subscriber unit users that are geographically co-located,a storage unit, responsive to the assignment unit, for storing a list of each of the subscriber unit users in the group, andan instruction unit, responsive to the assignment unit, for transmitting from at least a first satellite for instructing the subscriber unit users in the group to operate in a push-to-talk unit to unit mode on the assigned same frequency and channel such that, within each group of subscriber units users, a subscriber unit of the group can perform unit to unit communication with other subscriber units of the group utilizing the same frequency and channel assigned to that group by transmitting and receiving on a push-to-talk basis on the assigned same frequency and channel.

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