隨著網際網路的快速發展與通訊技術的逐步成熟，自網路擷取資訊已成為當今最重要的服務元素與生活型態，大多數人已日漸習慣無所不在的寬頻存取，各種相關的應用也不斷推陳出新。多元的網路服務需要更大的傳輸頻寬與更便利的傳輸方式，如何解決網路瓶頸與壅塞問題，正是行動通訊技術不斷探討與改善的主要議題之一。 目前行動無線通訊產業服務已從 H2H (Human to Human) 延伸到 M2M (Machine to Machine)，電信業者普遍認為 M2M 有潛力成為全球數位行動通訊成長最快的領域，無線行動通訊標準組織 (如IEEE, 3GPP) 皆已投入 M2M 標準制定。第四代行動通訊網路 (4G) 的高頻寬與低延遲特性，非常適合各種即時傳輸服務的應用，如多媒體資訊服務、安全監控、遠距醫療及智慧型電力網路等。 M2M未來的應用場景有下列幾項特性：廣泛的市場應用、小量資料傳輸、低成本、低功耗以及大量的終端設備建置。M2M 裝置將對現有行動通訊系統的頻寬與資源造成影響，如何滿足大量的終端裝置連線需求並同時減低對原有H2H 裝置電話與數據服務品質的衝擊，將是未來重要的解決方向。若進行大量 M2M 設備的佈署，現有之 H2H 上行競爭機制勢必將無法負荷 M2M 需求。本論文提出兩種分離式競爭機制，經由結合現有機制之優點，不只增進 M2M 設備競爭成功機率也同時避免M2M 設備對 H2H 設備造成碰撞問題。 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.
