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Patent

Communication system message authentication

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TLDR
In this paper, the authentication of system status OSWs in a trunked communication system is provided by first verifying (411) that a received system ID (313) matches a pre-programmed system ID before the information in the status OSW is programmed into a communication unit.
Abstract
Authentication of system status OSWs in a trunked communication system is provided by first verifying (411) that a received system ID (313) matches a pre-programmed system ID A system status OSW must then be matched twice before the information in the system status OSW is programmed into a communication unit (115), thus limiting the possibility of false decoding of system status OSWs

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References
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Mobile radio transmission system

TL;DR: In this article, the authors propose a registration procedure to prevent frequent re-registrations when the mobile station repeatedly crosses the boundary between two service areas, and when it registers with a new base station and hence a new service area it retains its registration with at least one service area with which it is already registered.
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TL;DR: In this article, a trunked communication signalling protocol is provided by a unifying signalling protocol in which subscribers request communication channels using only their individual IDs encoded into a single ISW, and the central decodes the call request, extracts the requesting subscriber's individual ID, which is cross referenced to determine the subscriber's talk-group affiliation(s).
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Method and apparatus for coordinating independent communications systems

TL;DR: In this paper, a method and apparatus for coordinating the transfer of communications control from one independent radio communications system to another is disclosed, where a remote unit which communicates data messages is associated with a home system which has a plurality of fixed sites and overlapping radio coverage areas.
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Dispatch trunked radio system.

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