Repeat request signal transmission method for multi-station packet communication
First Claim
1. A repeat request signal transmitting method for use in a multi-station packet communication system, in which a same message is transmitted in packet form from a single transmitting station to each of a plurality of receive stations in a multi-access environment, said method comprising the steps of:
- at each receive station, checking received packets for errors and sending back to the transmitting station repeat request signals, each repeat request signal comprising a frequency component which is determined at the receive station in response to packets found to be erroneous, the frequency of said components being based on a predetermined rule followed in the receive station and recognized in a transmitting station; and
at a transmitting station, sensing said respective frequency component of the said repeat request signal that is sent back from the receive station, comparing the energy level of the repeat request signal that is sent back from the receive station with a predetermined energy value, each of said frequency components being sensed to require a packet to be retransmitted if the received energy level is greater than said predetermined value, and determining which packets are to be retransmitted in the response to the received frequency components based on the said predetermined rule.
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Abstract
In a network wherein all the receive stations connected to a radio link or a bus type wire link are capable of observing information which is being transmitted over the link, a method of allowing each receive station to send back a repeat request signal in multi-station packet communication in which a single transmit station transmits the same message to a plurality of receive stations. The same number of frequencies as packets are used so that a sinusoidal wave having a particular one of the frequencies which is associated with a packet with an error is sent. Alternatively, the same number of time slots as packets are set up so that a burst signal is sent as a repeat request signal in a particular one of the time sots which is associated with information on a packet with an error. Utilizing the fact that the signals to be sent are repeat request signals, the method insures accurate delivery of retransmit request information to the transmit station even if repeat request signals sent back at the same time are in a conflict.
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Citations
7 Claims
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1. A repeat request signal transmitting method for use in a multi-station packet communication system, in which a same message is transmitted in packet form from a single transmitting station to each of a plurality of receive stations in a multi-access environment, said method comprising the steps of:
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at each receive station, checking received packets for errors and sending back to the transmitting station repeat request signals, each repeat request signal comprising a frequency component which is determined at the receive station in response to packets found to be erroneous, the frequency of said components being based on a predetermined rule followed in the receive station and recognized in a transmitting station; and at a transmitting station, sensing said respective frequency component of the said repeat request signal that is sent back from the receive station, comparing the energy level of the repeat request signal that is sent back from the receive station with a predetermined energy value, each of said frequency components being sensed to require a packet to be retransmitted if the received energy level is greater than said predetermined value, and determining which packets are to be retransmitted in the response to the received frequency components based on the said predetermined rule. - View Dependent Claims (2, 3, 4, 5)
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6. A repeat request signal transmitting method for a multi-station packet communication system in which a single transmit station transmits a same message in a packet format to a plurality of receive stations in a multi-access environment, said method comprising the steps of:
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at each receive station, checking received packets for error and sending back to the transmitting station a repeat request signal identifying erroneous packets, said repeat request signal comprising signal bursts appearing in particular time slots which are determined from the erroneous packets based on a predetermined rule followed by said receive station and recognized in a transmitting station; and at a transmitting station, sensing respective ones of said signal bursts in each time slot of said repeat request signals sent back by said receive station by comparing the received energy level of said signals with a predetermined value, each time slot being sensed to be a received repeat request signal if the received energy level is greater than said predetermined value and determining which of the packets is to be retransmitted in reponse to the time slots of the received signal, based on said predetermined rule.
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7. A repeat request signal transmitting method for a multi-station packet communication system in which a signal transmit station transmits a same message in a packet form to a plurality of receive stations in a multi-access environment, said method comprising the steps of:
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at each receive station, checking received packets for errors and sending back to the transmitting station repeat request signals comprising signal bursts appearing in particular time slots which are determined by encoding the number of erroneous packets into a binary code, each digit of which binary code corresponds to a time slot; and packet communication system in which a single transmit station transmits a same message to a plurality of receive stations in a multi-access environment, said method comprising the steps of; at a transmitting station, sensing respective ones of the signal burst in each time slot of said repeat request signal by comparing the received energy level with a predetermined value, each time slot being sensed as having been received if its received energy level is greater than said predetermined value, and determining the number of correction packets which are to be retransmitted by decoding the digits obtained from the received time slots.
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Specification