Timing of resource releasing for group mobility in LTE-Advanced network

Recently, LTE-Advanced is a mobile communication standard and high wireless bandwidth technology, formally submitted as a candidate 4G solution in the world. The major difference between 3GPP Release 10 (Rel-10) LTE-Advanced and the original LTE (Rel-8) is a new entity called relay node (RN) introduced in Rel-10. Since both backhaul link and access link of relay node are radio interface, the RN might be a portable device to move like a UE, and furthermore RN could move with its served UEs in some wireless network environments (e.g. both the RN and UEs inside the vehicle). When one RN handover to new DeNB as group mobility, it will cause a mount of UEs' handover simultaneously. How to manage huge handover signaling and radio resource in DeNB is an important issue in LTE-Advanced networks. In this paper, we try to design some possible solutions and analyze the performance of proposed schemes.