Abstract
Relay nodes (RN) have been suggested to be placed near the edge of a cellular network in order to improve link qualities of cell edge user equipments (UEs). Compared to conventional homogeneous networks, system performance for the relay-enhanced network can be significantly degraded if handovers between the RNs and evolved node base-station (eNB) are not correctly and immediately determined by the eNB. Therefore, the UEs may suffer from worse channel conditions which can result in increased energy consumption of entire network. In existing long term evolution advanced (LTEA) standard, fixed reporting time period from the UEs to eNB is considered inflexible which can be too long to provide immediate handover decisions. Hence, prediction-based handover (PH) process is proposed to allow eNBs to make potential handover decisions within the UE’s reporting period. The channel qualities for both the direct and relay-enhanced links during this period are predicted based on the partially observable Markov decision process (POMDP). Furthermore, this thesis also investigates the resource management problem in the relay-enhanced LTE-A systems. Existing research work does not fully consider all the influential factors to achieve energy efficiency for the LTE-A networks. In this thesis, a heuristic scheme named joint energy-efficient QoS-based resource management (J-EERM) is proposed to allocate multicast broadcast single frequency network (MBSFN) subframes, physical resource block (PRB) pairs, and transmission power with all combinations of transmission link. Moreover, some of the information needed in J-EERM scheme which can not be acquirable under conventional handover process can be obtained under proposed PH process. The proposed J-EERM scheme is targeting at energy efficiency with the consideration of both quality of service (QoS) requirements of UE and direct/two-hop communications. Moreover, the cascaded EERM (C-EERM) scheme is designed to reduce computational complexity compared to J-EERM scheme. Numerical results show that the proposed schemes can provide energy efficiency with consideration of UE’s QoS requirements for the LTE-A systems.
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