教師資料查詢 | 類別: 會議論文 | 教師: 趙志民 CHAO, CHIH-MIN (瀏覽個人網頁)

標題:Code placement and replacement strategies for wideband CDMA OVSF code tree management
學年90
學期1
發表日期2001/11/01
作品名稱Code placement and replacement strategies for wideband CDMA OVSF code tree management
作品名稱(其他語言)
著者Tseng, Y. C.; Chao, C. M.; Wu, S. L.
作品所屬單位淡江大學電機工程學系;San Antonio, MEXICO
出版者IEEE
會議名稱IEEE Global Telecommunications Conference
會議地點
摘要The use of OVSF codes in WCDMA systems has offered opportunities to provide variable data rates to flexibly support applications with different bandwidth requirements. Two important issues in such an environment are the code placement problem and code replacement problem. The former may have significant impact on code utilization and, thus, code blocking probability, while the latter may affect the code reassignment cost if dynamic code assignment is to be conducted. The general objective is to make the OVSF code tree as compact as possible so as to support more new calls by incurring less blocking probability and less reassignment costs. Earlier studies about these two problems either do not consider the structure of the OVSF code tree or cannot utilize the OVSF codes efficiently. To reduce the call blocking probability and the code reassignment cost, we propose two simple yet efficient strategies that can be adopted by both code placement and code replacement: leftmost and crowded-first. Numerical analyses on call blocking probability and bandwidth utilization of OVSF code trees when code reassignment is supported are provided. Our simulation results show that the crowded-first strategy can significantly reduce, for example, the code blocking probability by 77 percent and the number of reassignments by 81 percent, as opposed to the random strategy when the system is 80 percent fully loaded and the max SF = 256.
關鍵字
語言英文
收錄於
會議性質國內
校內研討會地點
研討會時間
通訊作者
國別墨西哥
公開徵稿Y
出版型式紙本
出處IEEE Global Telecommunications Conference, v.1,pp.293 - 302
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