| Summary: | 碩士 === 國立中央大學 === 通訊工程研究所 === 99 === As the development of network technology matures, getting information from network becomes the most important service in our daily life. With the increasing of related applications, most people are getting used to the omnipresent network day by day. How to resolve the bottleneck and the congestion problems of radio network with limited resource is one of the major issues in the next generation mobile networks.
Services of mobile communication have been extended from H2H (Human to Human) to M2M (Machine to Machine). The operators generally consider that M2M has the potential of being the fastest booming market in the worldwide digital communication network. The major mobile communication standard institutes (such as IEEE, 3GPP) are also involved in establishing standards of M2M communication system. The characteristics of broad bandwidth and low latency in the fourth generation mobile network (4G) are proper to be used in various real-time transmission services such as multimedia information service, security, remote health care, intelligent power network, and so on.
There are several unique characteristics in M2M applications, such as extensive application market, small data size, low cost, low power consumption and a huge amount of terminal equipments. All M2M devices may influence the usage of radio resources of the existing mobile communication systems. How to fulfill the access requirements of the huge amount of terminal equipments and reduce the impact of QoS of existing H2H devices will be the most important issue. Moreover, due to the deployment of M2M devices, the existing uplink contention scheme for the H2H devices could not handle the amount of traffic requests issued from M2M devices in a short term period. This thesis proposes two separated contention schemes, which take the advantages of the existing contention schemes, to solve the mentioned issue. The proposed schemes not only increase the access probability of M2M devices but also avoid the congestion problem on H2H devices because of M2M devices.
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