| Summary: | 碩士 === 國立交通大學 === 網路工程研究所 === 102 === Machine-to-Machine (M2M) communication, which is also known as Internet of Things (IoT) or Machine-Type communications as well, is expected to be a major trend in mobile communication such as LTE Advanced Networks. M2M communications enables devices to be controlled via internet. Currently, LTE networks are primarily designed and optimized for human-to-human (H2H) communications. Nevertheless, some designs such as paging for a device in Idle Mode are not suitable for M2M communications.
In this thesis, we first discover the paging issue for M2M communications. Furthermore, we investigate that there is trade-off between paging and Tracking Area Update (TAU). In addition, both paging and TAU are affected by the length of DRX cycle. The longer length of the DRX cycle is, the more paging cost will be. However, when the DRX cycle length becomes longer, the TAU cost will be smaller. Therefore, we discuss how DRX cycle length impacts the paging and TAU. Finally, we propose an easy and effective solution to minimize the signal resource consumption by adjusting the length of DRX cycle from the operators’ point of view. In performance evaluations, the optimal DRX cycle length we proposed can save more power and signal resources than the DRX cycle lengths defined in LTE specification (e.g., 32, 64, 128 or 256 millisecond).
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