中文摘要：

LTE TDD工作原理与LTE FDD类似,包括采用了相同的多址方案、信道编码技术等。这两种工作模式将向未来发展方向LTE-Advanced逐步演进,以满足ITU-R IMT-Advanced要求。本文分析了TDD系统的往返时间,描述了LTE TDD模式资源分配特点,介绍了采用不同功率控制设置的TDD系统上行链路频谱效率,给出了下行链路HARQ ACK/NACK集束处理方法,最后归纳了LTE TDD模式中的VoIP性能。

英文摘要：

The LTE TDD operation is very similar to LTE FDD, including exactly the same multiple access solutions, channel encoding, etc. Further development of LTE TDD mode proceeds together with the LTE FID mode towards the LTE-Advanced to meet the ITU-R IMT-Advanced requirements. This paper analyzes the Round Trip Time （RTT） for TDD systems, describes the features of TDD resource allocations in LTE, introduces the uplink spectral efficiency for LTE TDD systems with different power control settings, presents the processing means of downlink HARQ ACK/NACK bundling. In conclusion, we summarize the performance of VolP in LTE TDD mode.