초록 ▼

The present invention contemplates an improved dispatch trunked radio system which provides for individual subscriber to subscriber communication as well other enhanced trunking features. An expanded “dual-word”signalling protocol provides an improvement over prior “single word”signalling protocols

The present invention contemplates an improved dispatch trunked radio system which provides for individual subscriber to subscriber communication as well other enhanced trunking features. An expanded “dual-word”signalling protocol provides an improvement over prior “single word”signalling protocols by increasing the versatility of commands which may be communicated between the components of the trunked radio system. The “dual-word”signalling protocol of the present invention remains compatible with prior “single-word”subscriber units.

대표청구항 ▼

A method of transmitting and receiving messages between a transmitter and a receiver, comprising the steps of: in the transmitter: (a) transmitting a first data packet having at least one dedicated field contained therein, wherein said dedicated field is comprised of coded data that is first data pa

A method of transmitting and receiving messages between a transmitter and a receiver, comprising the steps of: in the transmitter: (a) transmitting a first data packet having at least one dedicated field contained therein, wherein said dedicated field is comprised of coded data that is first data packet information, and wherein said dedicated field can selectively be an indication that an associated second data packet will be transmitted following transmission of said first data packet; and (b) optionally transmitting a second data packet, wherein said second data packet includes at least one field that comprises coded data that is second data packet information, provided that said second data packet is only transmitted following transmission of a first data packet having said indication that an associated second data packet will be subsequently transmitted; and in the receiver: (c) decoding, if received by said receiver, said first data packet to determine its contents, such that: (1) if said first data packet does not include said indication that an associated second data packet will be transmitted, said receiver accepts information contained in said first data packet; (2) if said first data packet does include said indication that an associated second data packet will be transmitted, said receiver does not yet accept information contained in said first data packet; and (d) decoding, if transmitted by said transmitter and received by said receiver, said second data packet to determine its contents, such that; (1) if said second data packet was not preceded by reception, within a predetermined period of time, of a first data packet having an indication that an associated second data packet would be subsequently transmitted, said receiver will not accept information contained in said second data packet; and (2) if said second data packet was preceded by reception, within a predetermined period of time, of a first data packet having an indication that an associated second data packet would be subsequently transmitted, said receiver will accept information contained in both said second data packet and in said first data packet.