Information capacity and power control for slotted Aloha random-access systems

Information-theoretic capacity notions for a slotted Aloha random-access system are considered in this paper, as well as joint power and retransmission controls for this protocol. The effect of the bursty nature of the arrival and transmission process on the information-carrying capability and spect...

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Bibliographic Details
Published in:IEEE transactions on information theory 2005-12, Vol.51 (12), p.4074-4090
Main Authors: del Angel, G., Fine, T.L.
Format: Article
Language:English
Subjects:
Access protocols
Applied sciences
Channels
Coding, codes
Communication system control
Communications networks
Control equipment
Control systems
Decoding
Dynamic control
Dynamical systems
Dynamics
Exact sciences and technology
Information analysis
Information rates
Information systems
Information technology
Information theory
Information, signal and communications theory
multiaccess communication
multiuser channels
Power control
Random access memory
Signal and communications theory
Spectra
Stability
Telecommunications and information theory
Throughput
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Summary:Information-theoretic capacity notions for a slotted Aloha random-access system are considered in this paper, as well as joint power and retransmission controls for this protocol. The effect of the bursty nature of the arrival and transmission process on the information-carrying capability and spectral efficiency of the system is studied. The nature of the random-access protocol used to resolve decoding failures determines the system stability and dynamics, and in consequence its capacity. System control is carried out by dynamic control of retransmission probability and by power control. It is shown that substantial performance improvements can be achieved under this control scheme in terms of throughput and spectral efficiency for a range of channel parameters. The tradeoffs involving coding rate, system throughput, and spectral efficiency are analyzed from an information-theoretic point of view.
ISSN:0018-9448
1557-9654
DOI:10.1109/TIT.2005.859292