System which routes radio transmissions to selected repeaters for retransmission
First Claim
1. A radio transmission system designed to operate on a single defined frequency channel, comprising:
- a central receiver;
at least one transmitter remote from the central receiver;
a plurality of repeaters each adapted to receive a message transmitted thereto and to retransmit said message for receipt ultimately by said central receiver, said plurality of repeaters being located between said central receiver and said transmitter, each repeater having a respective unique identification address and memory means for storing a list of identification addresses corresponding to others of said repeaters which are within range thereof; and
control means for causing at least one of said repeaters to retransmit said message to a repeater within range which corresponds to an identification address on said list and, in the event that said retransmitted message is not correctly received, for retransmitting said message again except to a further one of said repeaters corresponding to another identification address on said list.
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Accused Products
Abstract
A radio transmission system designed to operate on a single defined frequency channel. The system comprises a central receiver (12), at least one transmitter (14) remote from the receiver and a plurality of repeaters (13) arranged in zones (Z1 to Zn) arround the receiver. Each repeater can receive a signal from a transmitter and re-transmit the message so that it eventually reaches the receiver by way of one or more repeaters. The system includes protection means for protecting the message against loss or corruption, for example by using unique time delays before re-transmission or by addressing a certain sequence of repeaters with alternate paths being provided to guard against the message being lost.
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Citations
19 Claims
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1. A radio transmission system designed to operate on a single defined frequency channel, comprising:
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a central receiver; at least one transmitter remote from the central receiver; a plurality of repeaters each adapted to receive a message transmitted thereto and to retransmit said message for receipt ultimately by said central receiver, said plurality of repeaters being located between said central receiver and said transmitter, each repeater having a respective unique identification address and memory means for storing a list of identification addresses corresponding to others of said repeaters which are within range thereof; and control means for causing at least one of said repeaters to retransmit said message to a repeater within range which corresponds to an identification address on said list and, in the event that said retransmitted message is not correctly received, for retransmitting said message again except to a further one of said repeaters corresponding to another identification address on said list. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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- 11. A radio transmission system designed to operate on a single defined frequency channel, comprising a central receiver, at least one transmitter remote from the central receiver and, located between said receiver and transmitter, a plurality of repeaters each adapted to receive a message from a transmitter or from another repeater and to re-transmit said message to the receiver either directly or via at least one other repeater, in which each repeater has a unique identification address, memory means storing a list of identification addresses relating to said repeaters within its range, and control means operative for causing the repeater to re-transmit said message to a first other of said repeaters corresponding to a first identification address on said list and, in the event that said re-transmitted message is not received or is incorrectly received by the first addressed repeater, to re-transmit said message again, but to a second other of said repeaters corresponding to a second identification address on said list.
Specification