Interference Coordination And Resource Allocation In Hierarchical Macro/Femto Networks

The growing requirements in multimedia traffic and high speed data traffic demand the higher requirements. With the higher spectrum is assigned to the new mobile wireless communication system, the system will face stronger transmission loss and space loss and weaker penetrating power to building walls. And the signal strength attenuation in the in-buildings due to the building material is not good enough for providing high speed data traffic to indoor users.The current research shows that indoor, low mobility, hot spot are the main application scenarios in the future. If macro-cells are used to provide coverage for users, the extra 70% base stations need to be deployment. It's impossible for operators to accept it. So, the base station with low transmit power called femtocell is paid close attention by several organizations.However there are still many challenges for it, such as resource allocation, timing/synchronization and backhaul for broadband femtocells; interference management, access control, handover, mobility and emergency call for voice femtocells, securely bridging to the femtocells with operator network over IP for network infrastructure. All those technical challenges restrict the commercial application for femtocells.In the second chapter of this thesis, an overview of femtocells is introduced from organization, standard process, network architecture, interface, to strive to establish the concept of femtocell. In the third chapter the scenario is considered from universal communication network and train-ground communication network to build the system level simulation platform for performance evaluation. In the fourth chapter, the interference management and handover in hierarchical network are researched. FFR based interference management scheme, SNR based handover algorithm are proposed to solve the co-channel interference and handover. At the last chapter, the transmission link in the train-ground communication network with femtocells deployed in carriages is modeled, analyzed and evaluated, then the capacity gain for the use of MIMO in train-ground communication network is estimated as a preparation for the further research.