IEEE Standard for Air Interface for Broadband Wireless Access Systems-- Amendment 3: Multi-tier Networks
MAC/PHY protocol enhancements for cooperation among base stations in multi-tier networks to enhance interference mitigation, mobility management, and base station power management are specified in this amendment. Enhanced base stations shall support legacy mobile stations. PHY changes to any mobile stations are out of scope. In addition, these protocol enhancements include management messaging between base stations, and between base stations and mobile stations.