An adaptive radio link protocol with enhanced data rates for GSMevolution
van Nobelen, R.; Seshadri, N.; Whitehead, J.; Timiri, S.
Personal Communications, IEEE
Volume 6, Issue 1, Feb 1999 Page(s):54 - 64
Digital Object Identifier 10.1109/98.752788
Summary:In this article we address the problem of link adaptation in a
wireless data system. Link adaptation is necessary in order to match the
data rate to time-varying channel and interference conditions. We
present a robust radio link protocol (RLP) based on the concept of
incremental redundancy (IR). Here, redundant data, for the purpose of
error correction, is transmitted only when previously transmitted
packets of information are received and acknowledged to be in error. The
redundant packet is combined with the previously received (errored)
information packets in order to facilitate error correction decoding. If
there is a decoding failure, more redundancy is transmitted. It is shown
here that an RLP built using the IR concept is more robust and has
better throughput than link adaptation schemes using explicit channel
measurements such as instantaneous or average signal-to-noise or
signal-to-interference ratio. We study the performance of an
implementation of a IR-based RLP for EDGE (enhanced data services for
GSM evolution) data and demonstrate its superior throughput and
robustness properties. The penalty paid for increased robustness and
higher throughput is additional receiver memory and higher delay. IR
based RLP has already been standardized for IS-136+ packet data and is
being actively considered for EDGE standardization
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