由於實現物聯網之移動隨意網路(IoT-enabled Mobile Ad Hoc Networks, IoT-enabled MANET)的通訊基礎是透過無線傳輸的技術互相通訊，且系統會產生大量的資料，然而不可能每一個物聯網裝置都配置一個固定通道，因此讓物聯網裝置具備動態頻譜感測與取得將是唯一可行方案，而感知無線(Cognitive Radio，CR)技術即具備動態頻譜感測與取得的特性，因此感知無線將是實現物聯網移動隨意網路能否成功的關鍵因素。本兩年連續型計畫之第一年將在以感知無線為基礎實現物聯網多重通道多重跳躍之移動隨意網路的環境中設計一個免競爭MAC協定，藉由叢集方法將節點分為多個one-hop叢集，以降低無線感知網路節點的競爭，進而降低資料傳輸的延遲；藉由判斷PU 空閒通道的使用狀況來動態的選擇語音通道以增進系統效能。所提免競爭保留機制，以記號環為基礎以確保即時語音傳輸延遲時間的QoS。第二年計畫將延續第一年計畫將節點分為多個one-hop叢集及對PU的感知無線技術。再藉由混合式MAC協定的免競爭保留機制讓即時語音傳輸的QoS延遲時間能在允許範圍內；藉由改良式T-CSMA/CA(Modified T-CSMA/CA, MT-CSMA/CA)為基礎之競爭MAC協定達到資源利用最大化。並且克服多重通道SU及PU隱藏節點及SU暴露節點的問題，達到降低PU干擾及提升SU通道使用率以提升系統輸出量。在這兩年連續型計畫提出一個以感知無線為基礎實現物聯網之多重通道移動隨意網路媒介存取協定(CR-based multichannel MAC Protocol for IoT-enabled MANET)。接下來，透過模擬分析，將本研究方法與先前的方法比較，證明本計畫所提出來的方法，確實比先前的方法更能提升系統輸出量及降低封包傳遞延遲。 The communication structure of Internet-of-Things-enabled Mobile Ad Hoc Networks (IoT-enabled MANET) is achieved by wireless technology. A lot of data will be created in the communication process. However, each object in IoT-enabled MANET to set a fixed channel is impossible. Therefore, each object of IoT-enabled MANET must have the ability of dynamic sense and access to spectrum. And this is the only feasible method to solve this problem. Each node of Cognitive Radio Networks (CRNs) has dynamic sense and access capability to spectrum. So, the Cognitive Radio (CR) is the key factor for IoT-enabled MANET will be success or not.In first year of this two year continuous proposal, the contention-free MAC protocol is proposed for CR-based multichannel and multi-hop IoT-enabled MANET. The contention among nodes and the end-to-end delay will be reduced by the clustering to divide the nodes into some clusters. The system performance will be increased by dynamic voice channel assignment according to the idle status of PU. The QoS of real time voice transmission will be guaranteed by token-based MAC protocol.In second year, the clustering method and CR technology to PU will be continued by first year. The hybrid MAC protocol is proposed. The QoS of end-to-end delay for real time voice transmission by contention-free scheme will be guaranteed and the utilization of resource will be maximized by contention-based of Modified Truncated CSMA/CA (MT-CSMA/CA). The multichannel hidden and exposed terminal problems will be overcome to increase the system performance by reduce the interference to PUs and increase the channel utilization of SUs.In this two year continuous proposal, the CR-based multichannel MAC protocol for IoT-enabled MANET is proposed. We also compare our proposed scheme to the other MAC protocols in CR-based IoT-enabled MANET using ns2 simulation tool. We will show that the proposed scheme will improve the system performance and guarantee the QoS of end-to-end delay.
