期刊刊名：Asian Journal of Arts and Sciences 　 卷期：1卷1期

篇名出版日期：2010年6月1日

作者：JUI-CHI CHEN

語言：English

關鍵字：WCDMA, Channelization, OVSF code, Code assignment, Single code, Multicode, BLRU, QBLRU

被點閱次數：0次

閱讀時間：0sec

摘要：
In WCDMA, channelization is achieved by assigning OVSF codes to different users. The codes in a Node-B are valuable and limited. Much research has been devoted to devising OVSF code-assignment strategies to support as many users as possible. A number of the strategies suffer from a “code-set fragmentation” problem, which increases the call blocking probability (CBP) on the Node-B. In order to resolve this issue some strategies have applied code-exchange and reassignment policies but increased the corresponding complexity. This paper proposes a Best-fit Least Recently Used (BLRU) code-assignment scheme without reassignment to approach an optimal method. Furthermore, we devise a revised version, Queue-assist BLRU (QBLRU), to improve system utilization and to obtain an even lower CBP than the optimal method does. Consequently, code-assignment simulation results present a QBLRU scheme that has a low CBP and the highest utilization, which is a high performance OVSF code-assignment scheme which should be useful for WCDMA networks.

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