Paper Info
Title
LTE Coverage Improvement by TTI Bundling
Abstract
Compared to WCDMA, the LTE radio access has a significantly shorter Transmission Time Interval (TTI) in order to reduce end-to-end delays. However, if a User Equipment (UE) at the cell edge is limited by its available transmission power, it may not be able to transmit an entire VoIP packet during one TTI, since the instantaneous source data rate is too high. Thus TTI bundling has been recently introduced as a feature of LTE Rel. 8 to improve the uplink coverage. In TTI bundling, a VoIP packet is transmitted as a single PDU during a bundle of subsequent TTIs without waiting for the HARQ feedback. HARQ feedback is only expected for the last transmission of the bundle. This paper studies TTI bundling and compares it to the conventional RLC segmentation. The simulation results indicate that TTI bundling provides a gain of more than 4 dB in terms of the sustainable path loss.
Year
DOI
Venue
2009
10.1109/VETECS.2009.5073660
VTC Spring
Keywords
Field
DocType
Internet telephony,automatic repeat request,radio access networks,HARQ feedback,LTE coverage improvement,TTI bundling,VoIP packet,transmission time interval
Hybrid automatic repeat request,Computer science,Network packet,Transmission Time Interval,Computer network,Quality of service,Real-time computing,Path loss,Automatic repeat request,User equipment,Telecommunications link
Conference
ISSN
ISBN
Citations 
1550-2252 E-ISBN : 978-1-4244-2517-4
978-1-4244-2517-4
18
PageRank 
References 
Authors
1.65
1
2
Name
Order
Citations
PageRank
Riikka Susitaival1181.99
Michael Meyer29512.55