3GRadioAccessEvolution--HSPAandLTEforMobile创新.PDFVIP

IEICE TRANS. COMMUN., VOL.E92–B, NO.5 MAY 2009 1432 INVITED PAPER Special Section on Radio Access Techniques for 3G Evolution 3G Radio Access Evolution — HSPA and LTE for Mobile Broadband — †a) † † †† Erik DAHLMAN , Ylva JADING , Stefan PARKVALL , Nonmembers, and Hideshi MURAI , Member SUMMARY This paper provides an overview of the 3GPP radio-access to enhance the support for downlink packet access in terms technologies for mobile broadband — HSPA and its evolution, and LTE. of improved service quality and enhanced system perfor- The paper also discusses the current stage of the 3GPP activities on evolv- mance, including ing LTE towards LTE-Advanced and full IMT-Advanced compliance. key words: 3G evolution, HSPA, LTE, IMT-Advanced, LTE-Advanced, 4G - Support for higher-order modulation (16QAM). - Use of shared-channel transmission where a set of 1. Introduction channelization codes is a common resource dynami- cally shared between users. Roughly eight years have passed since the first commer- - Possibility for fast channel-dependent scheduling and cial deployment of 3G mobile communication based on link adaptation dynamically selecting the user to trans- the WCDMA radio-access technology developed by 3GPP∗ . mit to, as well as the data rate to use for the transmis- Since then, the 3GPP radio-acce