资源块 (LTE下行链路)

资源块（LTE下行链路）是LTE下行链路分配给用户的最小单位。LTE下行链路能够分配给用户的资源包括频域资源、时域资源和空域资源，即既有频分复用，又有时分复用，还有空分复用。空域资源分配是通过MIMO实现的。资源块（resource block）是包含了12个子载波（频域）并且持续一个时隙slot（时域）的一个资源组合。一个时隙长0.5毫秒。

在0.5毫秒（一个时隙）时间内，LTE下行链路能够生成7个OFDM符号，每个符号占据12个子载波。不过资源块中OFDM符号的持续时间不完全相等，第一个OFDM符号的时间稍长（通过延长OFDM符号的循环前缀CP来实现）。资源块由资源片（resource element）组成，资源片是1个子载波（频域）并且持续一个时隙slot（时域）的资源组合。

两个时隙组成一个1毫秒的子帧（subframe），10个子帧(subframe)组成一个10毫秒的帧(frame)。帧（frame）是时域资源的最大单位。

假设某个用户的信息只占用一个资源块，LTE下行链路先将用户信息数据包串并转换成12路子数据流；每个子数据流用一个子载波进行调制，一共是12个子载波；调制过程重复7次，即产生7个OFDM符号。持续的时间是0.5毫秒；最后12路子载波承载的信息通过并串转换，在空口发送出去。

參見
 无线数据标准的对比
 eMBMS – LTE增强型广播多播服务。
 E-UTRA – LTE无线连接网络。
 Flat IP – 移动网络扁平IP架构。
 長期演進技術
 LTE Advanced – LTE的昇級版。
 系統架構演進 – 是3GPP對於LTE無線通信標準的核心網路架構的升級計劃。
 TD-LTE (LTE TDD) – 由中国所开发的一种可选的LTE标准。
 超行動寬頻 – LTE曾经的竞争对手，从未进行过商业化。
 WiMAX – 同屬4G的規格。
 HSPA+ - 3GPPHSPA标准的增强版本。
 Zadoff–Chu 公式
 下一代網路（NGN）

註釋

延伸阅读
 Erik Dahlman, Stefan Parkvall, Johan Sköld "4G – LTE/LTE-Advanced for Mobile Broadband", Academic Press, 2011, ISBN 978-0-12-385489-6
 Stefania Sesia, Issam Toufik, and Matthew Baker, "LTE – The UMTS Long Term Evolution – From Theory to Practice", Second Edition including Release 10 for LTE-Advanced, John Wiley & Sons, 2011, ISBN 978-0-470-66025-6
 Chris Johnson, "LTE in BULLETS ", CreateSpace, 2010, ISBN 978-1-4528-3464-1
 Erik Dahlman, Stefan Parkvall, Johan Sköld, Per Beming, "3G Evolution – HSPA and LTE for Mobile Broadband", 2nd edition, Academic Press, 2008,ISBN 978-0-12-374538-5
 Borko Furht, Syed A. Ahson, "Long Term Evolution: 3GPP LTE Radio And Cellular Technology", Crc Press, 2009, ISBN 978-1-4200-7210-5
 F. Khan, "LTE for 4G Mobile Broadband – Air Interface Technologies and Performance", Cambridge University Press, 2009
 Mustafa Ergen, "Mobile Broadband – Including WiMAX and LTE", Springer, NY, 2009
 H. Ekström, A. Furuskär, J. Karlsson, M. Meyer, S. Parkvall, J. Torsner, and M. Wahlqvist, "Technical Solutions for the 3G Long-Term Evolution," IEEE Commun. Mag., vol. 44, no. 3, March 2006, pp. 38–45
 E. Dahlman, H. Ekström, A. Furuskär, Y. Jading, J. Karlsson, M. Lundevall, and S. Parkvall, "The 3G Long-Term Evolution – Radio Interface Concepts and Performance Evaluation," IEEE Vehicular Technology Conference (VTC) 2006 Spring, Melbourne, Australia, May 2006
 K. Fazel and S. Kaiser, Multi-Carrier and Spread Spectrum Systems: From OFDM and MC-CDMA to LTE and WiMAX, 2nd Edition, John Wiley & Sons, 2008, ISBN 978-0-470-99821-2
 Agilent Technologies, "LTE and the Evolution to 4G Wireless: Design and Measurement Challenges", John Wiley & Sons, 2009 ISBN 978-0-470-68261-6
 Sajal Kumar Das, John Wiley & Sons (April 2010): "Mobile Handset Design", ISBN 978-0-470-82467-2 .
 Beaver, Paul, "What is TD-LTE?", RF&Microwave Designline, September 2011.
 Samuel C. Yang, "OFDMA System Analysis and Design", Artech House, 2010, ISBN 978-1-60807-076-3

外部連結

 LTE homepage from the 3GPP website
 LTE A-Z Description  3GPP LTE Encyclopedia

白皮书及其他技术信息

 LTE Technology Overview and Tutorial Series including Webinars and Video presentations
 "The Long Term Evolution of 3G" on Ericsson Review, no. 2, 2005 
 LTE technology introduction
 "3G Long-Term Evolution" by Dr. Erik Dahlman at Ericsson Research 
 "Long-Term 3G Evolution – Radio Access" by Dr. Stefan Parkvall at Ericsson Research 
 "3GPP Long-Term Evolution / System Architecture Evolution: Overview" by Ulrich Barth at Alcatel
 The 3G Long-Term Evolution – Radio Interface Concepts and Performance Evaluation
 LTE and the Evolution to 4G Wireless Design and Measurement Challenges – "LTE Security" 
 Role of Crypto in Mobile Communications "LTE Security"

 LTE Uplink Interference Modeling 

協作項目