Power line communication apparatus, power line communication method and communication apparatus
First Claim
Patent Images
1. A power line communication apparatus for transmitting a packet to another power line communication apparatus through a power line, said power line communication apparatus comprising:
- a receiver for receiving the packet, which is transmitted using a first transmission mode, having a first address used for multicast as a destination address;
a packet converter for converting the first address of the packet received by the receiver into a second address used for unicast;
a modulation scheme setting unit for setting a modulation scheme of the packet, which corresponds to a second transmission mode which has a higher transmission rate than the first transmission mode, in accordance with a noise status of the power line between said power line communication apparatus and said other power line communication apparatus on the basis of the conversion;
a transmission rate measuring unit for measuring a transmission rate of the packet at a first time interval;
a transmission rate controller for controlling the transmission rate on the basis of the measured transmission rate; and
a packet transmitter for transmitting, to said other power line communication apparatus, the packet having the second address, based on the modulation scheme set by the modulation scheme setting unit,wherein the transmission rate measuring unit changes the first time interval into a second time interval which is shorter than the first time interval on the basis of the measured transmission rate.
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Abstract
PLC modems and a PLC communication system that includes the PLC modems receive a multicast packet from a video server of a multicast group. When a MAC address table is set therein, the PLC modems and the PLC communication system convert the multicast packet into a unicast packet and transmit the converted packet to a power line. When no MAC address is set, the PLC modems and the PLC communication system transmit the multicast packet to the power line.
34 Citations
15 Claims
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1. A power line communication apparatus for transmitting a packet to another power line communication apparatus through a power line, said power line communication apparatus comprising:
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a receiver for receiving the packet, which is transmitted using a first transmission mode, having a first address used for multicast as a destination address; a packet converter for converting the first address of the packet received by the receiver into a second address used for unicast; a modulation scheme setting unit for setting a modulation scheme of the packet, which corresponds to a second transmission mode which has a higher transmission rate than the first transmission mode, in accordance with a noise status of the power line between said power line communication apparatus and said other power line communication apparatus on the basis of the conversion; a transmission rate measuring unit for measuring a transmission rate of the packet at a first time interval; a transmission rate controller for controlling the transmission rate on the basis of the measured transmission rate; and a packet transmitter for transmitting, to said other power line communication apparatus, the packet having the second address, based on the modulation scheme set by the modulation scheme setting unit, wherein the transmission rate measuring unit changes the first time interval into a second time interval which is shorter than the first time interval on the basis of the measured transmission rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15)
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14. A power line communication method for communicating between a power line communication apparatus and another power line communication apparatus through a power line, said power line communication method comprising:
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receiving a packet, which is transmitted using a first transmission mode, having a first address used for multicast as a destination address; converting the first address of the received packet into a second address used for unicast; setting a modulating scheme of the packet, which corresponds to a second transmission mode which has a higher transmission rate than the first transmission mode, in accordance with a noise status of the power line between said power line communication apparatus and said other power line communication apparatus on the basis of the converting; measuring a transmission rate of the packet at first time intervals; controlling the transmission rate on the basis of the measured transmission rate; transmitting, to the other power line communication apparatus, the packet having the second address, based on the setting of the modulation scheme; and changing the first time interval into a second time interval which is shorter than the first time interval on the basis of the measured transmission rate.
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Specification