Title :
Influence of HARQ with Unreliable Feedback on the Throughput of UMTS LTE
Author :
Breddermann, Tobias ; Eschbach, Benedikt ; Vary, Peter
Author_Institution :
Inst. of Commun. Syst. & Data Process. (IND), RWTH Aachen Univ., Aachen, Germany
Abstract :
In this paper, the impact of HARQ signaling errors caused by unreliable feedback on the throughput of communication systems like UMTS LTE is investigated. We derive analytical expressions for the calculation of the average number of transmissions per data frame as well as the system throughput based on a general feedback channel model. In combination with the residual frame error rates (FERs) after channel decoding, measured for a system with error-free feedback, a semi-analytical evaluation of the influence of unreliable feedback information on the system throughput can be carried out for any feedback channel condition. Consequently, time-consuming simulations of the respective system with unreliable feedback can be avoided. The theoretical results are verified by extensive simulations of the UMTS LTE physical layer. They are also applicable to other communication systems.
Keywords :
3G mobile communication; Long Term Evolution; automatic repeat request; channel coding; error statistics; feedback; telecommunication signalling; FER; HARQ signaling errors; UMTS LTE physical layer; channel decoding; communication systems; error-free feedback; feedback channel condition; feedback channel model; residual frame error rates; semianalytical evaluation; system throughput; time-consuming simulations; transmissions per data frame; unreliable feedback information; 3G mobile communication; Analytical models; Automatic repeat request; Decoding; Error analysis; Error probability; Throughput;
Conference_Titel :
Vehicular Technology Conference (VTC Fall), 2012 IEEE
Conference_Location :
Quebec City, QC
Print_ISBN :
978-1-4673-1880-8
Electronic_ISBN :
1090-3038
DOI :
10.1109/VTCFall.2012.6398875
