A novel queue-aware wireless link adaptation mechanism and its fixed-point analytical model
Date
2015Source Title
Eurasip Journal on Wireless Communications and Networking
Print ISSN
1687-1472
Publisher
SpringerOpen
Volume
2015
Issue
1
Pages
1 - 20
Language
English
Type
ArticleItem Usage Stats
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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.
Keywords
Fixed-point TCP modelIEEE 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
Permalink
http://hdl.handle.net/11693/25702Published Version (Please cite this version)
http://dx.doi.org/10.1186/s13638-015-0469-0Collections
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