新世代無線網路的行動多媒體支援; Mobile Multimedia Support for Next Generation Wireless Network

NCU Institutional Repository > 資訊電機學院 > 資訊工程研究所 > 博碩士論文 > Item 987654321/8431

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题名:	新世代無線網路的行動多媒體支援;Mobile Multimedia Support for Next Generation Wireless Network
作者:	廖明洸;Ming-Kuang Liao
贡献者:	資訊工程研究所
关键词:	連線允諾控制;功率控制;無線網路;個人通訊系統;power control;wireless network;PCS;CAC
日期:	2000-07-12
上传时间:	2009-09-22 11:26:48 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	未來個人通訊系統（PCS）預期可以提供使用者不受時間、地點、固定傳輸速率限制的多媒體服務。隨著個人通訊系統用戶的增加，訊號傳輸與資料庫存取量也隨之增加。為了能同時支援更多的使用者，適當的位置管理機制可以減輕大量的訊號傳輸負擔。另外，為了提供使用者更好的服務品質保證，對於個別連線所要求的頻寬、回應時間、傳輸可靠度都必須動態地調整。透過良好的系統資源管理機制可以最大化系統容量且可提高系統資源利用率。不同的多媒體服務型態會有不同的服務品質保證要求，語音通話及視訊會議等即時性服務對於延遲性的要求較高；但如電子郵件這樣的非即時性服務可以允許較大的延遲。在有限資源的環境下，利用如功率控制、連線允諾控制等資源管理機制確實可以最大化系統容量。下一代無線網路採用Code division multiple access（CDMA）系統，系統容量取決於干擾的情況，而傳輸功率在這樣的系統被視為可控制的系統資源。透過給定可以滿足個別的服務品質保證需求最小傳輸功率可使系統容量達到最大。在下一代無線網路中，合適的位置管理和如何最大化系統容量是主要的兩個關鍵議題。本篇論文主要含括兩個部分：（一）分散式架構位置資料庫的訊號傳輸代價分析；（二）CDMA系統中透過功率控制的連線允諾控制機制。 Future personal communication systems (PCS) are expected to provide multimedia services to human being without the limitations of fixed transmission rate, time, and location, etc. As the number of PCS subscribers keeps augmenting, the volume of signaling and database access traffic will increase in the same time. In order to afford huge amount of PCS subscribers, signaling load must be eased with proper location management mechanism. Furthermore, for providing better Quality of Service (QoS) for mobile users, the bandwidth, response time, and reliability of individual connections will require to be adjusted dynamically. A good resource management mechanism can maximize overall system capacity and resource utilization. Different multimedia traffic types have different QOS requirements. Real-time traffics, such as voice call and video conferencing, are delay sensitive, but non real-time traffics such as electronic mail aren’t. It is significant to maximize system capacity by proper resource management schemes such as power control and call admission control especially in the limited resource. The Code division multiple access (CDMA) system in new generation wireless network, system capacity is interference-limited, we consider the power of the users as controlled resources. Through assigning minimal sufficient power level for different traffic with individual QOS requirements, the system capacity becomes maximal. In new generation wireless network, location management and maximizing system capacity are two main important issues. This thesis mainly addresses two areas: (1) Signaling Cost Analysis For Distributed Location Database; (2) Call Admission Control (CAC) with Optimal Power Control in CDMA.
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