The invention provides a communication method, a
communication device and a communication
system, and relates to the technical field of communication. The communication method is applied to a control plane
network element, and comprises the following steps: receiving an IP type session establishment request message initiated by a terminal; obtaining subscription information of the VN group corresponding to the terminal and including the identifier of the VN group; creating a
group session corresponding to the VN group; sending a layer 2 forwarding identifier and an identifier of the VN group to the user plane
network element, wherein the layer 2 forwarding identifier is used for triggering the user plane
network element to perform layer 2 forwarding on the
Ethernet message received under the session; and sending a session establishment response message comprising a layer 2 forwarding identifier to the terminal, wherein the layer 2 forwarding identifier is used for triggering the terminal to process a message received through the session according to an
Ethernet message, or packaging data to be sent through the session into the
Ethernet message and then sending the Ethernet message. According to the embodiment of the invention, the terminal is helped to access the VN group in an IP type session mode and carry out layer-2 message transmission with other terminals in the VN group.