Channel-Adaptive Random Access for TDD-Based Wireless Systems

In this paper, a channel-adaptive random access transmission scheme is presented for time-division-duplex (TDD)-based wireless systems. In a TDD-based wireless system, using the channel reciprocity, the channel gain of an uplink (UL) can be estimated from that of a downlink. The channel-adaptive ran...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2011-07, Vol.60 (6), p.2730-2741
Main Authors: MOON, Hichan, CHOI, Suhan
Format: Article
Language:English
Subjects:
Access methods and protocols, osi model
Adaptive systems
Applied sciences
Channel estimation
Channels
Coverage
Delay
detection
Electrical engineering. Electrical power engineering
Electrical machines
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Fading
Flexibility
Gain
Information, signal and communications theory
low-power communication
Multiplexing
power control
power limitation
Random access
Receivers
Reciprocity
Regulation and control
Resource management
Signal and communications theory
Synchronization
Systems design
Telecommunications
Telecommunications and information theory
Teleprocessing networks. Isdn
Thresholds
Wireless communication
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Summary:In this paper, a channel-adaptive random access transmission scheme is presented for time-division-duplex (TDD)-based wireless systems. In a TDD-based wireless system, using the channel reciprocity, the channel gain of an uplink (UL) can be estimated from that of a downlink. The channel-adaptive random access scheme allows the transmission of a random access packet only when the channel gain of the UL is higher than a predetermined threshold. With channel-adaptive random access, it is possible to reduce the power required for random access transmission drastically at the cost of slightly larger transmission delay. If the threshold is set to zero, the presented channel-adaptive scheme is exactly the same as the conventional random access scheme. Therefore, channel-adaptive random access provides system design flexibility with the tradeoff between transmission power and transmission delay.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2011.2153221