An Efficient Heterogeneous Wireless Access Based on Region and Time Partitioning in D-TDD OFDM Systems
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- 作者：Nak-Myeong Kim ; Hee-Jeong Chung ; Mee-Ran Kim ; Hye-In Yu
- 关键词：Orthogonal frequency division multiplexing ; dynamic time division duplexing ; time slot allocation ; cross time slot
- 刊名：Lecture Notes in Computer Science
- 出版年：2007
- 出版时间：2007
- 年：2007
- 卷：4517
- 期：1
- 页码：346-357
- 全文大小：2,808 KB
文摘
Under dynamic time division duplexing (D-TDD) architecture in OFDM cellular systems, the inter-BS and inter-MS interference is inevitable during the cross time slot (CTS) period, and this interference seriously degrades the wireless access system performance. To mitigate such interference, we propose a region and time partitioning D-TDD architecture for OFDM systems. Each time slot in the CTS period is split into several minislots, and then each cell is divided into as many regions as the number of minislots per time slot. We then assign each minislot only to the users in its corresponding region. On top of such architecture, which inherently separates interfering entities farther from each other, we design a robust time slot allocation scheme considering the channel status of each mobile station. By computer simulation, it has been verified that the proposed scheme outperforms conventional time slot allocation methods in both the outage probability and the bandwidth efficiency.