Nova Patents
GR3034578T3

Continuous synchronous encryption and decryption in a wireless communications system throughout handoffs.

Abstract

In a wireless communication system comprising a plurality of fixed communication units (FCUs) (102) and portable communication units (PCUs) (120), each comprising an encryption synchronization counter (ESC) (314, 414), the PCU and FCU having a digital transmission format (201), a method of maintaining encryption and decryption throughout a hand-off is shown, comprising the steps of: (a) loading (708) during a hand-off initiation a continuation value for a second FCU ESC; and (b) incrementing (709) synchronously the second FCU ESC and the PCU ESC, starting from the continuation value and beginning at the time of hand-off completion.

Term

Term ended

Projected expiry passed 9 October 2020, 6 years ago.

  1. Priority
  2. Filed
  3. Published
  4. Projected expiry
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20 members in 14 offices

This recordMember, by publication datePriority claim4 more offices are in the list below

Priority claims8

Priority claims
DocumentOfficeKindDate
88868592United States of AmericaA
88868592United States of AmericaA
9304420United States of AmericaW
9304420United States of AmericaW
9304420–––
88868592–––
US19920888685–––
WO1993US04420–––

Members20

Family members, oldest first
DocumentOfficeKind
US5243653AUnited States of AmericaA
CA2135913A1CanadaA1
WO9325021A1World Intellectual Property Organization (WIPO)A1
CN1082274AChinaA
TW223207BTaiwan Province of ChinaB
MX9302947AMexicoA
EP0641505A1European Patent Office (EPO)A1
CN1030879CChinaC
MY109185AMalaysiaA
EP0641505A4European Patent Office (EPO)A4
CA2135913CCanadaC
EP0641505B1European Patent Office (EPO)B1
AT195043TAustriaT
ATE195043T1AustriaT1
DE69329111D1GermanyD1
ES2149816T3SpainT3
DK0641505T3DenmarkT3
PT641505EPortugalE
GR3034578T3This recordGreeceT3
DE69329111T2GermanyT2