| Summary: | 碩士 === 國立臺灣大學 === 電信工程學研究所 === 98 === Browsing Internet, sending emails or other services traditionally via fixed DSL has currently been replaced by via USB device. In the aspect of 3G operators, the sale with a little laptop, smart phone triggers a positive response from consumers. However, the rapidly growing of wireless broadband users will lead to the congestion of the wireless broadband network in the future. The capacity of wireless broadband base stations is limited in two factors: one is the bandwidth of the back-end line entity, and the other is the bandwidth of the wireless air interface. In fact, the back-end network is not a technical problem, which can be increased by increasing the physical link bandwidth. However, the wireless spectrum resource cannot be increased by increasing the physical lines, so Internet traffic congestion occurs mainly in the wireless interface.
In this thesis, we focus on the wireless interface side to do in-depth discussion and improvement. It is the fact that the current 3.5G network cards choose which network can be use for users is based on the first priority to the fastest network, followed by the strongest signal, but lack of the overall use of resources situation. We thus propose a dynamic network resource allocation mechanism to improve the current problems faced by 3.5G networks. How to improve the overall spectrum utilization and reduce the system to block users are our goals. In our proposed system architecture, it includes HSPA and HSPA+ two different network systems, operating at 5MHz frequency band, respectively, to provide data transmission services. Through simulation analysis and comparison of the proposed strategy, it has a significant improvement than that of the current 3.5G network card.
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