| 摘要: | 隨著無線寬頻技術的演進，目前的基地台已經無法滿足逐漸成長的頻寬需求，然而不論是語音或是資料服務，有超過60%的使用者都是在室內使用，所以設置可提供無線室內寬頻網路的設備將會是下一代網路的重要議題。而以目前的趨勢來看，Relay與Femtocell將會是兩個重要的提供室內覆蓋的重要技術。不論在IEEE或是3GPP的規格中，都已經有部分的規格，然而在實際的佈建上卻會遇到許多的問題，如時間同步、干擾管理等問題。我們在第一年先由Femtocell技術開始研究，由於Femtocell是使用者安裝之設備，所以對服務提供商來說，充滿了許多佈建上的挑戰。目前我們已經完成了時間同步的方法如IEEE 1588，接下來則是詳細設計Over-The-Air Time Synchronization的方法並且驗證其可行性。此外，我們也已經完成了部分干擾消除的研究，希望能夠再加上功率控制的方法來使受干擾的使用者最少。而第二年將會針對Relay的部分做研究，LTE-A規格目前剛開始Relay的討論，所以會跟隨規格制定的進度研讀與分析其造成的影響。除此之外，智慧型動態頻寬配置將會是我們第二年的研究重點，由於微型基地台的獨特性，若能夠有效的配置頻寬，不僅可以提高頻寬使用率，也可以滿足服務品質等要求。第三年則為Relay的服務品質保證（QoS）與流量控制設計出動態調適之機制，為了相容於既有規格的服務品質保證，所以Relay需要加入服務品質保證對應方式，才能以變動最少的前提下符合服務品質保證。除此之外，由於Machine to Machine Communication 概念的產生，流量控制將會是保護基地台或是核心網路不過載的重要機制，同時流量控制也必須盡可能確保傳輸之可靠性以及滿足服務品質保證。此計畫會以OPNET網路模擬器與數學分析來驗證所設計通訊協定之正確性，並且做系統整合之工作，最終的目標為改善室內傳輸技術遇到之瓶頸，並使其能動態調適得到最好之系統效能。 As the wireless broadband technology evaluates, the base station cannot satisfy the growing requests of bandwidth. However, more than 60% of users use either voice or data services in indoor environment. As a result, the indoor communication technology like Femtocell or Relay is the key issue for next generation communication technology. Both the Femtocell and the Relay are specified in the standards of IEEE 802.16 and 3GPP. However, indoor deployment suffers several challenges like time synchronization and interference management. In order to successfully carry out the project, we plan a 3-year project. In the first year, we focus on the Femtocell technology. Because the Femtocell is setup by users in their home or office, it is hard for service provider to manage them. We have already studied the IEEE 1588 protocol in the first year. Then, we will design a Over-The-Air Time Synchronization method to assist Femtocell to synchronize with Macrocell. Moreover, we complete the algorithm which can mitigate the interference problem without power control. However, there are still users suffering from interference. As a result, we will design a interference mitigation algorithm with power control to mitigate the interference problem as possible. Then, our research will focus on the other indoor technology, Relay. Because the 3GPP just starts discussing the design principle of Relay, we will discuss the impact of the LTE/LTE-A network with Relays. Meanwhile, we will design methods to alleviate the affection of interference caused by Femtocell and Relay to improve the system throughput. In this year, we will also design a bandwidth allocation algorithm to utilize the channel efficiency. In the third year, we will design the QoS and flow control mechanism. To adopt the existing architecture, the new QoS mapping is needed for Relay to guarantee the QoS requirement. As the “Machine to Machine Communication” is applied, the flow control mechanism is import to prevent the base stations and the core network from over loading. And the flow control mechanism is to improve the reliability and to achieve the QoS requirements. In this project, we will use the OPNET network simulator and mathematical analysis to verify our algorithm. Finally, we hope to design suitable protocol to solve the problem of indoor deployment and utilize the system efficiency. 研究期間：10008 ~ 10107 |
