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    Preventing collisions in direct mode operation systems by informing other communication units that a resource is utilised
    2.
    发明专利
    Preventing collisions in direct mode operation systems by informing other communication units that a resource is utilised 未知

    公开(公告)号：GB2391756A

    公开(公告)日：2004-02-11

    申请号：GB0218644

    申请日：2002-08-10

    Applicant: MOTOROLA INC

    Inventor： SERFATY SALOMON ,  SHAHAF MARK ,  LEVY OFER

    IPC: H04W84/08 ,  H04Q7/32

    Abstract: A communication system comprising a plurality of mobile communication units that are operable to communicate with one another either directly or via an intermediary communicating unit, wherein the communication system includes a mobile communication unit capable of being configured as a primary communication unit for communications on a time divided communication resource with one or more secondary communication units, the communication system being characterised by one or more of the secondary communication units (300) being operable to transmit one or more beacon signals(440) during available time periods of the time divided communication resource whilst participating in a communication with one or more other mobile communication units, to inform other secondary communication units not participating in the call that the communication resource is being utilised. Advantageously the provision of beacon signals (440) in available time periods of the communication resource whilst a communication is on-going, ensures that hidden terminals outside of a coverage range of a master (primary) communication unit (300) do not attempt to access the communication resource and create signal collisions in so doing.

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