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Zoned microcell with sector scanning for cellular telephone system

  • US 5,193,109 A
  • Filed: 10/25/1991
  • Issued: 03/09/1993
  • Est. Priority Date: 02/06/1989
  • Status: Expired due to Term
First Claim
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1. In a cellular telephone system wherein a plurality of contiguous cells, each having an assigned set of communication channels, are arranged with handoff means for maintaining continuous communication with mobile telephones moving from cell to cell,a cell having a plurality of antenna sets, each set being positioned and having transmitting and receiving means directionally configured to limit propagation and reception of signals substantially to a zone within the boundaries of said cell,each of said plurality of antenna sets being divided into a plurality of sub-sets, each sub-set being positioned and having transmitting and receiving means directionally configured to limit propagation and reception of signals substantially to a sector within the boundaries of the zone served by the associated antenna set,control means including means for monitoring the strength of the signal associated with each one of the communication channels assigned to said cell and received by each of said sub-sets of each of said antenna sets,and means for switching to a selected antenna sub-set in said cell having the strongest received signal associated with a selected one of the communication channels such that communication using said selected communication channel is maintained and is limited to the sector associated with the selected antenna sub-set.

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