《动态切换点，调度方法On the Performance of Flexible UL-DL Switching》.pdf

The Second GlobeCom 2011 Workshop on Femtocell Networks On the Performance of Flexible UL-DL Switching Point in TDD Wireless Networks Pekka J¨anis and Visa Koivunen C´assio B. Ribeiro SMARAD CoE, Dept. of Signal Processing and Acoustics, Nokia Research Center School of Electrical Engineering, Aalto University P.O. Box 407, FI-00045 Nokia Group, Finland P.O. Box 13000, FI-00076 AALTO, Finland email: cassio.ribeiro@ email: {pekka.janis, visa.koivunen}@aalto.fi Abstract—An advantage of Time Division Duplex (TDD) wire- to interference between UL and DL transmissions [6]. Co- less networks over Frequency Division Duplex (FDD) is that the channel interference mitigation in flexible switching point UL-DL switching point may be flexibly adapted to asymmetric TDD networks has been studied in e.g. [7], [8], [9]. traffic loads. This enables more efficient spectrum use, but on the other hand may lead to harmful cross-link interference between Switching point adaptation to instantaneous traffic may be cells. As a result, the net gain (or loss) from flexible TDD depends more appropriate in local area networks with small cells. In on the traffic characteristics and network scenario. In this paper this paper we demonstrate the benefits from such adaptation we address the problem in local area packet data networks where by analyzing its performance in single and two interfering link high fluctuation in short term traffic loads is expected. We show cases, and also in system simulations of a larger scenario. through analysis and system level simulations that in such a