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Inter-exchange soft handoff in a cellular telecommunications system

  • US 6,009,328 A
  • Filed: 05/21/1996
  • Issued: 12/28/1999
  • Est. Priority Date: 09/24/1993
  • Status: Expired due to Term
First Claim
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1. In a cellular telecommunications system in which a user mobile station relays user information radio signals via at least one of a plurality of base stations and in which said base stations further relay said user information signals via at least one of a plurality of mobile exchanges to and from another system user, the a method for inter-exchange soft handoff with diversity combining, comprising the steps of:

  • maintaining the relay of user information signals between a mobile station and a first mobile exchange via a first base station connected by a first connection to said first mobile exchange, said first mobile exchange further relaying the user information signals to and from another system user, said first mobile exchange controlling the user communications,establishing a further second connection for further second relay of said user information signals between said mobile station and said first mobile exchange via a further second base station connected to a further second mobile exchange, said second mobile exchange further relaying said user communications signals to said first mobile exchange,performing diversity combining at said first mobile exchange of said user information signals as relayed from said mobile station to said first mobile exchange via said first connection and said further second connection, said first mobile exchange offering the combined user information signal to said other system user,performing further diversity combining at said mobile station of said user information signals as relayed from said other system user to said first mobile exchange and relayed further via said first connection and said further second connection to said mobile station.

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