A novel queue-aware wireless link adaptation mechanism and its fixed-point analytical model

Date
2015
Authors
Ozturk, O.
Akar, N.
Advisor
Instructor
Source Title
Eurasip Journal on Wireless Communications and Networking
Print ISSN
1687-1472
Electronic ISSN
Publisher
SpringerOpen
Volume
2015
Issue
1
Pages
1 - 20
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
Abstract

A point-to-point (PTP) wireless link is studied that carries long-lived TCP flows and is controlled with active queue management (AQM). A cross-layer queue-aware adaptive modulation and coding (AMC)-based link adaptation (LA) mechanism is proposed for this wireless link to improve the TCP-level throughput relative to the case where AMC decisions are made based solely on the physical layer (PHY) parameters. The proposed simple-to-implement LA mechanism involves the use of an aggressive modulation and coding scheme (MCS) with high spectral efficiency and high block error rates when the queue occupancy exceeds a certain threshold, but otherwise a relatively conservative MCS with lower spectral efficiency and lower block error rates. A fixed-point analytical model is proposed to obtain the aggregate TCP throughput attained at this wireless link and the model is validated by ns-3 simulations. Numerical experimentation with the proposed analytical model applied to an IEEE 802.16-based wireless link demonstrates the effectiveness of the proposed queue-aware LA (QAWLA) mechanism in a wide variety of scenarios including cases where the channel information is imperfect. The impact of the choice of the queue occupancy threshold of QAWLA is extensively studied with respect to the choice of AQM parameters in order to provide engineering guidelines for the provisioning of the wireless link.

Course
Other identifiers
Book Title
Keywords
Fixed-point TCP model, IEEE 802.16, Queue-aware link adaptation, Analytical models, Efficiency, Local area networks, Modulation, Network layers, Queueing theory, Rayleigh fading, Transmission control protocol, Active queue management, Adaptive modulation and coding, High spectral efficiency, Link adaptation, Modulation and coding schemes, Numerical experimentations, TCP modeling, Queueing networks
Citation
Published Version (Please cite this version)