A wireless communication network serves a wireless User Equipment (UE) and comprises a wireless access node and a support access node. The wireless access node determines packet drop rate for the support access node. The wireless access node determines an add threshold for the support access node based on the packet drop rate for the support access node. The wireless access node determines an add value for the support access node and determines when the add value is greater than the add threshold. When the add value is greater than the add threshold, the wireless access node signals the support access node to serve the wireless UE and signals the wireless UE to attach to the support access node. In response, the support access node wirelessly transfers user data for a wireless communication service to the wireless UE.