LTE Uplink Coverage Enhancement Techniques Based on Enhanced TTI Bundling

Author

Yu Zhou ; Tiankui Zhang ; Zhimin Zeng ; Yiqun Li ; Yunan Han

Author_Institution

Beijing Key Lab. of Network Syst. Archit. & Convergence, Beijing Univ. of Posts & Telecommun., Beijing, China

fYear

2012

fDate

21-23 Sept. 2012

Firstpage

1

Lastpage

4

Abstract

In the Long Term Evolution (LTE) system, there is limited on uplink average data rate the cell edge users for the power limitation and the inherent short Transmission Time Interval (TTI) length of the cell edge users. TTI bundling scheme was presented for the VoIP service in the LTE Release 8 specifications to solve the cell coverage problem. But the R8 TTI bundling is restricted to bundles of 4 TTIs, QPSK modulation and allocations up to 3 PRBs, which impose restrictions on the support of the medium data rate service. In this paper, several TTI bundling enhancement schemes with different RTT, HARQ process number, TTI bundled size and the maximum number of HARQ retransmission are discussed in detail and evaluated by the link-level simulation. The simulation analysis proves that TTI bundling enhancement schemes can effectively improve uplink coverage performance in LTE system.

Keywords

Long Term Evolution; automatic repeat request; radio links; HARQ process number retransmission; LTE release 8 specification; LTE uplink coverage enhancement technique; Long Term Evolution; QPSK modulation; RTT; TTI bundling enhancement scheme; VoIP service; cell coverage problem; cell edge user; inherent short transmission time interval; link-level simulation; medium data rate service; power limitation; uplink average data rate; Data models; Delay; Long Term Evolution; Quality of service; Signal to noise ratio; Simulation; Uplink;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications, Networking and Mobile Computing (WiCOM), 2012 8th International Conference on

Conference_Location

Shanghai

ISSN

2161-9646

Print_ISBN

978-1-61284-684-2

Type

conf

DOI

10.1109/WiCOM.2012.6478568

Filename

6478568