Communication system, a repeater terminal in a communication system and a communication method
First Claim
1. A communication system for transmitting packet data from a transmitter terminal to a destination terminal through at least one of a plurality of repeater terminals, comprising:
- a first transmitting means for transmitting the packet data from the transmitter terminal toward the destination terminal;
a receiving means for receiving a response signal that is for the packet data transmitted by the first transmitting means and is transmitted from the destination terminal; and
a second transmitting means for transmitting a control signal including information for the transmitter terminal and the destination terminal and information for the packet data depending on presence or absence and type of the response signal;
wherein the first transmitting means further includes a means for repeating the packet data after sending the control signal from the second transmitting means;
the destination terminal includes a third transmitting means for sending a response signal to the transmitter terminal in response to the packet data transmitted from the first transmitting means;
the plurality of repeater terminals each comprises;
a first repeating means for receiving the packet data and sending the packet data to the destination terminal or one or more of the plurality of repeater terminals, anda second repeating means for sending the response signal received by the receiving means to the transmitter terminal or one or more of the plurality of repeater terminals, anda determining means for determining its contribution numerically based on a number of repeating times of the packet data repeated by the respective first repeating means and number of repeating times of the response signal repeated by the respective second repeating means;
each of the plurality of repeater terminals enters into a repeating mode for continuously sending the packet data when the determining means determines that the respective contribution is high, or a numeric value for the contribution reaches a predetermined threshold or higher; and
each of the repeater terminals enters into a sleep mode for repeating no packet data when the determining means determines that the respective contribution is low, or the numeric value for the contribution does not reach a predetermined threshold or higher.
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Accused Products
Abstract
This invention provides a communication system, a repeater terminal in the communication system and a communication method for improving the characteristics in a multi-hop communication by a diversity gain and reduces the power consumption by wasteful retransmission in packet transmission at a wireless terminal. When a transmitter terminal S sends a packet first time, repeater terminals R1-R13 perform a data transmission by retransmission at all the terminals which received the packet. When a transmitter terminal S sends a packet second time, a repeater terminal determines its own contribution based on the hop numbers of the repeating in the packet transmission and the return ACK (or NACK) repeating. The repeater terminal with a high contribution autonomously determines to be in “repeater mode” and the repeater terminal with a low contribution autonomously determines to be in “sleep mode”.
8 Citations
7 Claims
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1. A communication system for transmitting packet data from a transmitter terminal to a destination terminal through at least one of a plurality of repeater terminals, comprising:
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a first transmitting means for transmitting the packet data from the transmitter terminal toward the destination terminal; a receiving means for receiving a response signal that is for the packet data transmitted by the first transmitting means and is transmitted from the destination terminal; and a second transmitting means for transmitting a control signal including information for the transmitter terminal and the destination terminal and information for the packet data depending on presence or absence and type of the response signal; wherein the first transmitting means further includes a means for repeating the packet data after sending the control signal from the second transmitting means; the destination terminal includes a third transmitting means for sending a response signal to the transmitter terminal in response to the packet data transmitted from the first transmitting means; the plurality of repeater terminals each comprises; a first repeating means for receiving the packet data and sending the packet data to the destination terminal or one or more of the plurality of repeater terminals, and a second repeating means for sending the response signal received by the receiving means to the transmitter terminal or one or more of the plurality of repeater terminals, and a determining means for determining its contribution numerically based on a number of repeating times of the packet data repeated by the respective first repeating means and number of repeating times of the response signal repeated by the respective second repeating means; each of the plurality of repeater terminals enters into a repeating mode for continuously sending the packet data when the determining means determines that the respective contribution is high, or a numeric value for the contribution reaches a predetermined threshold or higher; and each of the repeater terminals enters into a sleep mode for repeating no packet data when the determining means determines that the respective contribution is low, or the numeric value for the contribution does not reach a predetermined threshold or higher. - View Dependent Claims (2, 3, 4)
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5. A repeater terminal for repeating packet data which is sent from a transmitter terminal to a destination terminal, comprising:
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a first repeating means for receiving the packet data sent from the transmitter terminal and sending the packet data to the destination terminal or another repeater terminal of a plurality of repeater terminals; a second repeating means for receiving a response signal sent from the destination terminal and sending the response signal to the transmitter terminal or another repeater terminal; and a determining means for determining its contribution numerically based on a number times the packet data is repeated by the first repeating means and number of times the response signal is repeated by the second repeating means, wherein each of the repeater terminals enters into a repeating mode for continuously sending the packet data when the determining means determines that the contribution is high, or a numeric value for the contribution reaches a predetermined threshold or higher, and each of the plurality of repeater terminals enters into a sleep mode for repeating no packet data when the determining means determines that the contribution is low, or the numeric value for the contribution does not reach a predetermined threshold or higher. - View Dependent Claims (6)
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7. A communication method for transmitting packet data from a transmitter terminal to a destination terminal by repetition using a plurality of repeater terminals, comprising the steps of:
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transmitting the packet data from the transmitter terminal toward the destination terminal; receiving a response signal for the packet data transmitted at the transmitter terminal; transmitting a control signal including information for the transmitter terminal and the destination terminal and information for the packet data depending on presence or absence and type of the response signal; retransmitting the packet data which was sent after sending the control signal; sending a response signal for the sent packet data toward the transmitter terminal from the destination terminal; receiving the packet data at one of the plurality of repeater terminals and subsequently sending the packet data to one or more of the plurality of repeater terminals; receiving the response signal at one of the plurality of repeater terminals and subsequently sending the response signal to the transmitter terminal or one or more of the plurality of repeater terminals; determining a contribution of each respective repeater terminal numerically based on a number of repeating times of the packet data and number of repeating times of the response signal; entering the respective repeater terminal into a repeating mode for continuously sending the packet data when the determining means determines that the contribution is high, or a numeric value for the contribution reaches a predetermined threshold or higher; and entering the respective repeater terminal into a sleep mode for repeating no packet data when the determining means determines that the contribution is low, or the numeric value for the contribution does not reach the predetermined threshold or higher.
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Specification