使用MC-CDMA/TDMA於無線ATM網路軟式移交之動態資源調整研究

STUDY ON DYNAMIC RESOURCE ALLOCATION FOR SOFT HANDOFF USING MC-CDMA/TDMA IN WIRELESS ATM NETWORKS

在無線通訊中，因有限的頻寬、相關應用及使用人數遞增的情況下，針對如聲音、視訊及資料等不同的服務類別與不同服務品質（quality of service；QoS）要求下，有效的頻寬管理與排程，將使人們對多媒體無線通訊的需求得到滿足。無線通訊的管理必須講求高系統使用率（utilizatioz）、高傳輸正確率（correctness）、及高服務品質。多重載送分碼多工（multi-carrier code division multiple access；MC-CDMA）可在同一時間內使用多個虛擬雜訊碼（pseudorandom noise code；PN-code）傳送資料，使得網路整體輸出率（throughput）有效提高並且能同時支援不同交通流量（traffic）。本文針對無線非同步傳輸模式網路在MC-CDMA環境下之交通管理以提升對不同使用者的異質服務，提出動態資源分配機制（dynamic resource allocation mechanism；DRAM），設計一有效資源分配管理演算法及補償方式，可降低移交連線斷訊率（handoff call dropping probability）以及新連線阻塞率（new call blocking probability），提升網路的整體服務效能。

In wireless communication, although the limited bandwidth, its related application and the number of users have been growing, the efficient bandwidth management and traffic scheduling make people satisfy the requirement of the multimedia wireless communication for different service types (e.g., voice, video, data etc.) and different quality of service (QoS) requests. In order to obtain high utilization, high correctness, and high QoS, network management for wireless communication must be considered. Multi-carrier code division multiple access (MC-CDMA) scheme can use several pseudo-noise (PN) codes to transmit in the same period to make higher throughput and support different traffic streams. This paper uses MC-CDMA to manage traffic and provide different services for wireless ATM network. We propose a dynamic resource allocation mechanism (DRAM), which designs an effective resource allocation management algorithm and compensate method, to reduce the dropping probability of handoff calls and blocking probability of new calls.