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A power line carrier communication frame length adaptive adjustment method and device
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An adaptive adjustment, power line carrier technology, applied in distribution line transmission systems, electrical components, digital transmission systems, etc., to achieve the effect of low complexity
Active Publication Date: 2018-08-17
STATE GRID CORP OF CHINA +1
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[0007] In order to solve the technical problem that the IPv6 message frame length in the power line carrier communication network is usually larger than the MAC layer frame length of the PLC in the prior art, fragmentation transmission is required, the present invention proposes an adaptive adjustment of the power line carrier communication frame length method and device
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Embodiment 1
[0038] Such as figure 2 Shown is the algorithmflow chart of the aforementioned "rough adjustment" of the transmission frame length in this embodiment, that is, the preliminary adjustment process. Such as image 3 As shown, the power line carrier communication frame length adaptive adjustment method in the embodiment of the present invention includes:
[0039] Step S301: Initialize the sending frame length, using a default value or a priori value as the initial sending frame length L;
[0040] Before sending the IP data packet, the source node adopts a default value or a priori value method to confirm the length of the initial sending frame. The default value is the minimum frame length unit of the micro-protocol data unit MPDU, and the a priori value method is used to determine the initial frame length by listening to the frame length successfully sent by other nodes in the current channel or the frame length successfully sent by the node last time .
[0041] Step S302: ...
Embodiment 2
[0048] Figure 4 This embodiment is an algorithmflow chart of the aforementioned "fine adjustment" of the transmission frame length L, that is, the precise adjustment process. Such as Figure 5 As shown, the power line carrier communication frame length adaptive adjustment method in the embodiment of the present invention includes:
[0049] Step S501: Initialize the value range of the transmission frame length L, the frame length L at the time of initialization in this step is the value range of the frame length L after the "coarse adjustment" in the first method embodiment [L i , 2L i ].
[0050] Step S502: Set the value range of L to [L j , L k ], where j=0 when L j = L i , when k=0, L k = 2L i ; When j=0, k=0, the value range of L during initialization in step S501 is satisfied.
[0051] Step S503: Make the sending frame length L=L j +m×(L k - L j ), m is a preset division factor, and sends the IP data packet with the frame length L, and then resends with the ...
Embodiment 3
[0059] The process of "fine-tuning" in the second embodiment of the method is described in detail below with the third embodiment of the method. In this embodiment, it is assumed that the division coefficient m is the golden ratio coefficient of 0.618, such as Figure 6 As shown, the method includes:
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Abstract
The invention discloses a method and a device for adaptively adjusting a power line carrier communication frame length. The method comprises steps: A, a transmitting frame length is initialized, and a default value or a priori value is adopted as the initial transmitting frame length L; B, an IP data packet is transmitted at the frame length L, transmission again is carried out at the same transmitting frame length when the transmission succeeds, and retransmission is carried out at the same transmitting frame length when the transmission fails; C, when transmission at continuous two times succeeds, the transmitting frame length L is doubled, and the step B is carried out; and when transmission at continuous two times fails, the transmitting frame length L is halved, and the step B is carried out; and D, after i times of frame length doubling and halving, when transmission at continuous two times at a frame length Li succeed and transmission at continuous two times at a frame length 2Li fail, the value range of the frame length L is determined to be [Li, 2Li].
Description
technical field [0001] The present invention relates to the technical field of power communication, in particular to a method and device for adaptively adjusting the frame length of power line carrier communication. Background technique [0002] Power line communication technology (power line communication, PLC) is a special communication method that uses power lines as the information transmission medium for data or voice transmission. The power network is widely distributed, and the power line carrier communication system can reuse the existing power line network without additional network deployment overhead. But in general, the characteristics of the power line carrier channel are not ideal. The specific performance is that the noise is significant and the signal attenuation is very serious, which greatly reduces the communication reliability of PLC. Improving the reliability of power line carrier communication can be considered from the perspective of the physical laye...
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