JP2007258897A5

JP2007258897A5 -

Info

Publication number: JP2007258897A5
Application number: JP2006078659A
Authority: JP
Filing date: 2006-03-22
Publication date: 2008-11-27

Claims

In the power line carrier communication device connected to the power line,
Means for detecting periodically generated noise superimposed on the AC voltage in synchronization with the AC voltage of the power line;
A frame sequence is composed of one or a plurality of frames so as to avoid the periodic noise, and the sum of the lengths of all the frames constituting the frame sequence and the lengths between the frames is the period of the AC voltage of the power line. A power line carrier communication apparatus comprising: scheduling means for configuring a frame to be equal to 1/2 .

2. The power line carrier communication apparatus according to claim 1, wherein the scheduling unit configures a frame shorter than a value obtained by subtracting a detected noise width from ½ of the period of the AC voltage of the power line. .

The means for detecting the noise is:
The sum of the length of each frame and the length of the interval between frames is longer than ½ of the AC voltage cycle of the power line, and the frame transmission timing shift with respect to the AC voltage of the power line changes every frame cycle. Send a training signal consisting of a sequence of frames consisting of multiple frames,
The power line carrier communication apparatus according to claim 1, wherein a transmission path condition is detected by detecting a change in quality of a received training signal.

The means for detecting the noise detects a section in which the deterioration of the quality of the received training signal is maximized in a half of the period of the AC voltage. Power line carrier communication device.

The power line carrier communication apparatus according to claim 1, wherein the means for detecting the noise detects a section in which the deterioration of the quality of the received training signal exceeds a reference value.

The means for detecting the noise is:
The above transmission path status is detected for each time interval,
2. The power line carrier communication apparatus according to claim 1, wherein a section in which deterioration in signal quality is larger than a reference value is divided again into a plurality of smaller sections, and transmission path conditions are detected for each of the smaller sections. .

The means for detecting noise detects deterioration of a received training signal based on at least one of signal strength, subcarrier S / N ratio, number of error corrections, and CRC result. Item 4. The power line carrier communication device according to Item 1.

2. The scheduling unit according to claim 1, wherein at the timing of occurrence of the detected noise, a schedule is provided in which a section in which user data is not transmitted is provided in a channel for transmitting and receiving user data in a frame. The power line carrier communication apparatus described in 1.

The said scheduling means comprises a flame | frame so that the modulation system according to the detection result of the S / N ratio of the subcarrier of the received training signal may be allocated to a different time interval, respectively. Power line carrier communication device.

2. The power line carrier according to claim 1, wherein the scheduling means grasps time interval priority information of each slave based on a detection result of periodic noise of a connected slave in a time direction and performs scheduling. Communication device.

In the power line carrier communication device connected to the power line, the phase of the AC voltage of the power line is detected, and a frame sequence is configured with one or a plurality of frames so as to avoid a section where the AC voltage has the maximum amplitude, A power line carrier communication apparatus comprising schedule means for constituting a frame so that the sum of the lengths of all the frames constituting the frame train and the length between the frames is equal to ½ of the period of the AC voltage of the power line.

The power line carrier communication apparatus according to claim 1 or 11 , wherein time division multiple access is performed for data transmission.

The power line carrier communication apparatus according to claim 1 , wherein the power line carrier communication apparatus is controlled by polling for data transmission.

6. The power line carrier communication apparatus according to claim 5 , wherein the scheduling unit performs training only in a section in which it is determined that the quality deterioration exceeds a reference value by the noise detection unit.