P-PERSISTENT CARRIER SENSE MULTIPLE ACCESS (CSMA) FOR NON-PACKETIZED WIRELESS DIGITAL VOICE NETWORKS
First Claim
Patent Images
1. A communications system, comprising:
- a plurality of radios that form a CSMA wireless communications network and communicate non-packetized digital voice with each other;
each radio being operative for dividing the period following the end of a received transmission into a sequence of time slots, and in each time slot, deciding randomly or pseudo-randomly with probability p whether to start transmitting on the channel in that slot, provided that a new transmission has not been detected on the channel prior to the start of the slot.
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Abstract
A communications system includes a plurality of radios that form a CSMA wireless communications network to communicate none-packetized digital voice with each other. Each radio is operative for dividing the period following the end of a received transmission into a sequence of time slots, each having a duration at least equal to an effective end-to-end traffic latency. In each time slot, the radio decides randomly with probability p whether to start transmitting on the channel in that slot, provided that a new transmission has not been detected on the channel prior to the start of the slot.
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Citations
29 Claims
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1. A communications system, comprising:
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a plurality of radios that form a CSMA wireless communications network and communicate non-packetized digital voice with each other; each radio being operative for dividing the period following the end of a received transmission into a sequence of time slots, and in each time slot, deciding randomly or pseudo-randomly with probability p whether to start transmitting on the channel in that slot, provided that a new transmission has not been detected on the channel prior to the start of the slot. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for communicating digital voice, which comprises:
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receiving within a radio a non-packetized digital voice communications signal over a CSMA wireless communications channel; dividing the period following the end of a received transmission into a sequence of time slots; and in each time slot, deciding randomly or pseudo-randomly with probability p whether to start transmitting on the channel in that slot, provided that a new transmission has not been detected on the channel prior to the start of the slot. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for communicating digital voice, which comprises:
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receiving within a radio a non-packetized digital voice communications over a CSMA wireless communications channel; determining at the radio the start time of a sequence of transmit time slots; determining which of the transmit time slots in the sequence of transmit time slots is a first slot in which the radio can transmit; and if a key switch at the radio is depressed before a start of a time slot in which the radio can transmit, playing an audible signal as a hold-off tone at the radio and informing an operator that the radio must wait before transmitting, and when a next time slot arrives in which the radio can transmit, the audible signal is removed and the radio starts to transmit, and if a key switch is depressed after a start of the time slot, then waiting for a start of a next time slot to transmit. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification