电信科学 ›› 2013, Vol. 29 ›› Issue (4): 74-77.doi: 10.3969/j.issn.1000-0801.2013.04.015

• 研究与开发 • 上一篇    下一篇

LTE TDD系统中下行HARQ机制的研究

陈发堂1,万翠1,樊玺2   

  1. 1 重庆邮电大学重庆市移动通信技术重点实验室 重庆 400065
    2 电子科技大学 成都 611731
  • 出版日期:2013-04-15 发布日期:2013-04-15
  • 基金资助:
    国家科技重大专项基金资助项目

Research of Downlink HARQ Mechanism in LTE TDD System

Fatang Chen1,Cui Wan1,Xi Fan2   

  1. 1 Chongqing Key Lab of Mobile Communications，Chongqing University of Posts and Telecommunications，Chongqing 400065，China
    2 University of Electronic Science and Technology of China，Chengdu 611731，China
  • Online:2013-04-15 Published:2013-04-15

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摘要：

在对长期演进（long term evolution，LTE）下行数据发送机制详细分析的基础上，针对下行数据发送过程的实现，提出一种混合自动重传请求（hybrid automatic repeat request，HARQ）选择方案，遵照协议给出的反馈时延的时隙关系，在设计中采用反馈判断和优先重传的方案，实现了HARQ反馈和重传时刻的正确映射，并研究了同步HARQ 和异步HARQ 的往返时间（round trip time，RTT），仿真分析了不同上下行配置对HARQ RTT的影响，提出了一种最小化RTT的方法，从而为网络侧提供业务不同时的配置选择提供了参考。

关键词: LTE, RTT, 上下行配置, HARQ过程

Abstract:

Based on a detailed research on the mechanism of downlink data transmission in LTE system，an errorfree HARQ solution to realize the downlink data transmission process was provided.According to the relations of the feedback delay，associated decision of feedback judgment and retransmission priority were adopted to complete the correspondence between them.A research on RTT of synchronous and asynchronous HARQ and the influence of different UL-DL configurations on HARQ RTT were also studied.Then a method to minimize RTT was put forward to provide reference for eNode B to choice configurations when providing different communication services.

Key words: LTE, round trip time, UL-DL configuration, HARQ

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