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In this paper, we compare the performance attained by several scheduling policies when the resource allocation is performed in a per-user or in a per-frequency resource ordering. We test the capability of both approaches to deal with the quality of service (QoS) provisioning in a multi-service scenario in a mobile OFDMA network. We probe that the comparative performance of these two approaches depends...
Most of the existing scheduling algorithms in OFDMA and TDMA systems assume the availability of perfect channel quality indicator (CQI) at the transmitter. Unfortunately, this is unrealistic since the receiver (e.g. mobile users) estimates the CQI at time t - ?? and feed back this CQI estimate to the transmitter (e.g. base station). The scheduler uses then this outdated CQI at time t to make the allocation...
Orthogonal frequency division multiple access (OFDMA), adopted in the IEEE 802.16e WiMax system, possesses many advantages in the physical layer, but also poses many challenges from the aspect of radio resource allocation. In the IEEE 802.16e WiMax system, a truncated binary backoff algorithm is adopted for resolving the contention in random access, while the time-division OFDMA is used for the connection-oriented...
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