A Wired Communication Method Supporting Multiple Users

Abstract

The invention discloses a wired communication method supporting multiple users. All users in each group of subnets are grouped. After grouping, all users in each group obtain a frequency band including the frequency points used by the group, priority, and maximum The channel competition configuration of contention window, maximum backoff window, and upper and lower limits of the time slots that can be accessed; the central node determines the channel competition configuration of the group according to the number of users in different groups and the success rate of transmission under the group, and uses the The success rate of PRS contention in a group determines the channel contention configuration of the group. The invention overcomes the situation that the speed of the existing power carrier equipment drops significantly when a large number of users exist, and designs a user access mechanism that can support a large number of users to access the power carrier device at the same time.

Description

technical field [0001] The invention belongs to the technical field of power line carrier communication, and in particular relates to a wired communication method supporting multiple users. Background technique [0002] Power line carrier communication supports contention access transmission mode, that is, at the same time, all users on the same power line first listen to whether there is someone transmitting data in the channel, if not, back off a transmission waiting delay, and a user competes to the channel sending opportunities such as figure 1 The sender starts to send data. If there is only one user sending in this time slot, the user succeeds in competing for the channel, and other users will hear the data sent by the user and enter the backoff phase, such as figure 1 Competing user 1 in , the backoff window is 6, which is less than the sender’s 4, so when the sender sends, it detects the sender’s sending and starts to back off. The transmission waiting delay can be...

AI Technical Summary

Problems solved by technology

[0004] Based on the current power carrier communication system, if the number of users increases, the probability of collision in the entire system will increase significantly, and the transmission efficiency is very low

On the other hand, since power carrier communication usually uses power lines as the transmission medium, and the power grid is usually a fully connected network architecture, all users connected to the power grid share the same medium and share the transmission bandwidth, so the large number of users At the same time, the transmission resources assigned to each user are more limited. In particular, for PRS resources, when there are many users with the same priority on the power carrier, for example, the number of transformers that need to send control signals becomes very large. When , the PRS between these users is also indistinguishable from each other, and it still cannot solve the competition conflict among users in the group

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