- 學位論文
階層式網路中可調適頻道對系統效能之影響
The Efficiency of Self-adaptive Subrating Channel Assignment for Hierarchical Cellular Network
摘要
階層式蜂巢網路(HCN)是目前最常見的通訊環境架構，大部分都是應用於電信系 統。而提高其系統性能的關鍵在於如何解決頻道分配問題。不同環境有著不同類型 的通訊，每種通訊都應可以找到最適當的頻道分配方法。目前已提出的常見相關技 術有Guard Channel、Overflow、Subrating 等。但是在真實環境當中，這些通訊類型 都是混合出現，而非在單一地區只有單一種類的通訊類型。Self-adaptive Subrating 提供了一種fuzzy model，可以觸發Subrating 和Overflow。在複雜的環境當中， Self-adaptive Subrating 可以提供較好的系統效能、頻道使用率，以及更低的阻塞率 和斷線率。
並列摘要
Hierarchical Cellular Network architecture (HCN) is the most common architecture that widely used in the mobile telecommunications operation. Channel assignment is the key issue to improve System performance. Different kind of traffic types is applicable to recent proposed methods such as guard channel, overflow and subrating. But in real world, these traffics are intermixture. A fuzzy model for Self-adaptive Subrating Channel Assignment could trigger subrating ratio and overflow method. In the complex traffic environment, this channel assignment strategy can provide better performance on block, handoff failure, and system channel utilization.