and Scheduling of IP Traffic over Fading Channels
Nilo Casimiro Ericsson
IEEE Vehicular Technology Conference - VTC'99-Fall
Amsterdam, The Netherlands, September 19-22 1999.
© 1999 IEEE
In future packet based wireless communication systems, transmission
in the downlink will often dominate the traffic load. High bit-rate
applications like WWW-browsing, file transfer, and full motion video
will impose strong requirements on the system capacity. An obstacle in
this context is the time-variability of the channel: For mobile users,
frequently occuring fading dips will cause unnecessary, and capacity
In this paper we investigate the effect of adaptive modulation,
along with time-slot scheduling of IP-like traffic in a scenario
involving several types of mobile hosts and one base station.
We extend a study of the impact of adaptive modulation
and scheduling on the bit-error rate, to include
models for packet length and packet inter-arrival, to find
the queueing delay imposed by our proposed scheduling algorithm.
Our scheduler keeps the bit error rate at attractively low, prespecified
levels, well suited for Forward Error Correction (FEC) codes.
Moreover, the scheduler splits the bandwidth between
different types of traffic in a desirable way, according to the
by Nilo Casimiro Ericsson, Oct. 2004.
Licenciate Thesis by Nilo C. Ericsson, June 2001.
paper on combining hybrid-II ARQ with predictive scheduling.
PCC Workshop conference paper
Globecom'99 conference paper
on adaptive modulation and predictive scheduling.
Postscript, 549K ;
Personal use of this material is permitted.
However, permission to reprint/republish this material for
advertising or promotional purposes or for creating new
collective works for resale or redistribution to servers or lists,
or to reuse any copyrighted component of this work in other works
must be obtained from the IEEE.