In a wireless communication network, a pair of eNodeBs exchange X2 signaling over a primary X2 signaling link. The eNodeBs implement a secondary X2 signaling link when the primary X2 signaling link goes down. The eNodeBs serve multiple wireless communication device groups with a Device-to-Device (D2D) communication service. The eNodeBs detect a performance loss of the primary X2 link, and the eNodeB with the most device groups selects a group to implement the secondary X2 link. The eNodeBs establish the secondary X2 signaling link through the selected device group. The eNodeBs exchange X2 signaling over the secondary X2 signaling link through the selected wireless communication device group. The selected device group uses the D2D communication service to exchange the X2 signaling over the secondary X2 signaling link.