| Summary: | 碩士 === 國立交通大學 === 資訊科學與工程研究所 === 102 === LTE becomes one of the most important communication technologies in the next generation. With the increasing popularity of mobile devices, cellular networks suffer the dilemmas of mobile data traffic explosion. To resolve this problem, operators and standard development organizations have developed HetNet solutions, which offload traffic from cellular networks to other radio access technologies to reduce the overloading situation. To minimize the service blocking ratio and satisfy the service demand, HetNets need to design an efficient approach to allocate the channel resource. However, HetNets have to deal with the heterogeneous protocol problem. Thus, this work proposes the Combined UE and BS Information scheme (CUBI), which is based on the standard architecture which is proposed by 3GPP. First, we discuss the UE and BS information, respectively. We compare the impacts of using the two types of information to make the offloading decision. Afterwards, this work proposes the 2-round decision to obtain the advantage of UE and BS information. The decision with UE information is based on the channel qualities of all the available networks, hence, it can choose the target network which has the highest channel quality. The decision with BS information is based on the channel resource utilization of all the UEs to allocate the channel resource to multiple UEs at the same time. On the other hand, the main idea of the decision with combined UE and BS information is to obtain the advantage of these two type information and allocate the channel resource properly for UEs. The simulation results demonstrate that decision with combined UE and BS information can decrease the service blocking ratio down to 24.93% and 10.53% compared to the decision with UE and BS information schemes, respectively.
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