在進階長程演進系統 (LTE-Advanced) 以及全球互通微波存取系統 (WiMAX) 中，設備對設備 (D2D) 通訊被視為一個潛在的無線電存取技術，提供了設備之間直接通訊的能力。由於設備之間不用透過基地台的連結直接通訊，使得在一個細胞中每個資源塊都可以被用戶端設備同時重覆使用。此種技術在高傳輸負載的環境下能有效減緩頻寬受限的問題。
在本篇論文中，我們提出一個能讓每個資源塊被重覆使用超過一次的方案。我們先比較分別於上行和下行頻段中之D2D連線建立被阻塞的機率。為了觀察額外的使用者所產生之干擾的影響，我們檢視一個細胞中不同的D2D使用者數量下的總吞吐量。在沒有資源塊可以被使用的情況之下，我們假設一個人對人 (H2H) 通訊使用者的通話可以搶走D2D連線正在使用的資源塊。基於上述假設，我們推導出 D2D 使用者的被強制終止率。模擬的結果顯示，在我們的方案中，一個資源塊可以同時至少使用三次，並且每個使用者可以維持近似的吞吐量。

Device-to-Device (D2D) communication is considered as an underlying radio access technology in Long Term Evolution-Advanced and WiMAX to provide direct communication capabilities between devices. Based on the direct communication between user equipments (UEs), each resource block (RB) may be reused for several times in one cell. In this case, the problem of limited spectrum can be relieved in high tra c load environment.
In this thesis, we propose a scheme to reuse each RB more than once. We first compare blocking probability of D2D session setup in uplink than that in downlink part. To observe the e ect of extra interference produced by additional users, we investigate the total throughput in one cell under various numbers of D2D users. Based
on the assumption that an human to human (H2H) call can preempt an existing D2D session when no RB is available, we derive the force-terminated probability of a D2D
user. Simulation results show that an RB can be used at least 3 times in our scheme while maintaining similar throughput of each user.

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