An Efficient and Fair Scheduling Scheme for Multiuser OFDM Wireless Networks
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An Efficient and Fair Scheduling Scheme for
Multiuser OFDM Wireless Networks



.pdf   OFDM Wireless Networks.pdf (Size: 522.21 KB / Downloads: 1)

Abstract

This paper proposes a new MAC scheduling scheme
for efficient support of multimedia services in multiuser OFDM
wireless networks, both in the uplink and in the downlink. This
scheme is based on a system of weights that dynamically accounts
for the experienced QoS and the transmission conditions in
an extended higher layers/MAC/PHY cross layer design.

INTRODUCTION

Orthogonal Frequency Division Multiplexing (OFDM) efficiently
reduces the disastrous effects of multipath fading
in wireless transmissions [1]. This modulation technique is
now acknowledged as the reference for next generation broadband
wireless networks (4G systems) and is already widely
implemented in most recent wireless systems like 802.11a/g
or 802.16. Recently, much research effort has focused on
multiple access schemes that operate on top of an OFDM
based physical layer. At the MAC level, making an efficient
use of the scarce bandwidth is challenging. The main design issues
are system throughput maximization and fairness. Jointly
providing both is a tough task no current work solves well yet.

SYSTEM DESCRIPTION

We focus on the proper allocation of radio resources among
the set of mobiles situated in the coverage zone of an access
point. We consider a centralized approach. The packets
originating from the backhaul network are buffered in the
access point which schedules the downlink transmissions. In
the uplink, the clients signal their traffic backlog to the access
point which builds the uplink resource mapping. We assume
that the physical layer is operated using the structure described
in Fig. 1 which ensures a good compatibility with the OFDM
based transmission mode of the IEEE 802.16-2004 [10], [11].

CONCLUSION

In this paper, we propose a new scheduling scheme for wireless
multimedia networks, called “Weighted Fair Opportunistic
(WFO)”. This scheme operates on top of an OFDM-based
physical layer and shows a good compatibility with the existing
802.16 standard. Based on a system of weights, the WFO
scheduling introduces dynamic priorities between the mobiles
according to their transmission conditions and the delay they
currently experience in a higher layers/MAC/PHY cross-layer
approach.
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