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the nodes will use the control plane,to pass signaling messages between each other. and the path of the signaling messages ,will be from the UE ,to the eNodeB, which provides the radio interface for the UE.
then from the e node B, to the MME, which performs authentication and security, and tracks the location, of the UE, and performs admission control. then from the MME ,to the HSS, that stores subscription information for every user, and the SGW, witch serves as mobility anchor point, for user plane data. and the SGW connects to the PGW, which connects between the EPC, and the PDN.
while the user plane, is used to pass user data, sent and received, between the UE and the PDN. the path of user plane data, will be as following, from the UE to the eNodeB, then from the e Node B to the SGW, and from the SGW to the PGW, then from the PGW, to the PDN.