The wireless relay, thatis, the relay node plays a role of relaying in the wireless network, canrealize signal relay and amplification, thereby extending the coverage of thewireless network. In terms of the operation mechanism of the relay, the relaycan be divided into flood relay and directional relay.
Flooding relay refers to any data packet received by the relay device at anytime. It does not perform any filtering and parsing, and directly forwards it onthe current channel.
As shown in the figure below: purple is the relay node, green is the data node,red is the target node, the dotted circle indicates the effective radiocoverage of its node, and the data packet sent by the data node is received bythe relay node within its effective range, relaying The node immediatelyinitiates a packet forwarding on the data receiving channel, and finally thepacket is received by the target node within the effective range of the relaynode, and the relay transmission from the data node to the target node isimplemented. It can be seen that after the data node is forwarded through therelay device, its effective working range is logically expanded, so that thedata can be transmitted farther.

Relay application in wirelesscommunication
Although the flooding relay can expand the data transmission radius, itsforwarding action is unconditional, which means that all data in the effectiverange of the relay node will be forwarded, which may not be applicable in somecomplex network environments.
Directional trunking, similar to flooding trunking, the biggest difference isthat packet forwarding requires conditional filtering. Each data node sends adata packet containing the data source and destination address sent, and eachrelay node records one or more data routing and forwarding rules. When the datanode sends the data packet. After reaching the relay node, the relay node firstunpacks the data, extracts the data source and the destination address andcompares the local routing rule once, and performs directional forwarding ifthe comparison is successful.
As shown in the figure below, there are two relay nodes in the data node range.After the data sent by the data node, both the left and right relay nodes inthe figure can receive the data packet, and the left relay has the datarouting. Information, so the data is successfully forwarded once, and the rightrelay has no such data route, and packet filtering is discarded.

Relay applicationin wireless communication

Because the directional relay has the routing and forwarding information, itcan effectively avoid unnecessary data transmission and reception in the reviewenvironment with more nodes, thus increasing the efficiency of datatransmission.
Chengdu Ebyte Electronics E55-433MS wireless transparent transmission module, perfectfor flooding relay and directional routing relay function, while avoiding the"forwarding storm" effectively, realizing efficient data relaytransmission