Deterministic multi-access method for a decentralized mobile radio system
First Claim
1. A method for accessing one of a first plurality of data channels of a decentralized radio system comprising a plurality of stations, wherein each station is predeterminately assigned to monitor one of a plurality of control channels and assigned a unique identification code, in order to perform a hand-shake routine over the control channel assigned to a called station, before establishing a communication link between a calling and said called station over said one of said plurality of data channels, comprising:
- (a) searching said data channels at said calling station until an idle one of said data channels is obtained;
(b) reserving said idle data channel;
(c) monitoring at said calling station the control channel assigned to said called station, after reserving said idle data channel;
(d) transmitting a control packet on the control channel being monitored by said calling station after the control channel has been determined to be idle for a predetermined interval; and
(e) monitoring the control channel after transmitting a control packet to determine if a response packet from the called station is received.
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Accused Products
Abstract
A mobile radio system uses a predetermined number of control channels over which a hand-shake routine is performed to determine called station availability, before one of a limited number of talk channels (local and repeater) is assigned for communication between a calling and the called station. After locating an idle talk channel (local channels are searched first), the control channel to which the called station is predeterminedly assigned is attempted to be accessed. Transmission times on the control channel are a function of the called station'"'"'s identification code, thus creating a logical ring. Provision is made for message based priorities, emergency numbers and high priority for stations having experienced a previous unsuccessful attempt to access a control channel.
111 Citations
12 Claims
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1. A method for accessing one of a first plurality of data channels of a decentralized radio system comprising a plurality of stations, wherein each station is predeterminately assigned to monitor one of a plurality of control channels and assigned a unique identification code, in order to perform a hand-shake routine over the control channel assigned to a called station, before establishing a communication link between a calling and said called station over said one of said plurality of data channels, comprising:
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(a) searching said data channels at said calling station until an idle one of said data channels is obtained; (b) reserving said idle data channel; (c) monitoring at said calling station the control channel assigned to said called station, after reserving said idle data channel; (d) transmitting a control packet on the control channel being monitored by said calling station after the control channel has been determined to be idle for a predetermined interval; and (e) monitoring the control channel after transmitting a control packet to determine if a response packet from the called station is received. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. In a decentralized radio system including a plurality of stations wherein a plurality of data channels are provided for communication between said stations, a method for establishing a communication link between a calling station and a called station comprising the steps of:
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providing a plurality of control channels for performing a handshake routine between said calling station and said called station before establishing communication over one of said plurality of data channels; monitoring at each station a predetermined one of said control channels; monitoring at said calling station the particular control channel being monitored by said called station until this channel is determined to be idle for a first predetermined time interval; transmitting a control packet from said calling station to said called station on said particular channel after said particular channel has been determined to be idle for said first time interval; and monitoring said particular control channel at said calling station after transmitting said control packet to determine if a response packet is received from said called station and, if so, establishing communication between said calling station and said called station over one of said plurality of data channels.
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Specification