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In this paper, we present a performance evaluation for six scheduling algorithms over a MIMO-OFDM based cellular system. We have selected a set of scheduling algorithms that may use information about the instantaneous channel conditions, status of transmission queues, QoS requirements or pending HARQ retransmissions. Performance evaluation is focused on average delay under different cell load conditions,...
In a downlink orthogonal frequency division multiple access (OFDMA) system, allocating sub-channels and power across multi-user can require excessive feedback of channel state information. An efficient proportional fair scheduling algorithm based on cluster feedback scheme is proposed in the paper. Simulation results show that the scheme needs only little feedback information while maintaining guaranteed...
The IEEE 802.16 standard, defining the Worldwide Interoperability for Microwave Access (WiMAX) for Metropolitan Area Network (MAN). The IEEE 802.16 standard, includes specification for the Medium Access Control (MAC) and Physical (PHY) layers, is designed to serve all kinds of traffic. The standard is equipped with signaling and bandwidth allocation algorithms that can accommodate many connections...
A QoS aware multi-traffic scheduling scheme is proposed for multiple traffics to exploit the mutltiuser diversity of NRT users with reduced CQI feedback. In the proposed scheme, the urgent RT users are scheduled first, and then both the remaining RT users and the NRT users are scheduled on the remaining resources at the same time. Based on the proposed scheduling scheme, a reduced feedback strategy...
Scheduling algorithms are very important in WiMAX allowing an efficient radio resources distribution to the uplink and downlink connections. However, the IEEE 802.16 standard does not specify which scheduling algorithm(s) should be used. In this paper, we propose a review of scheduling algorithms proposed for WiMAX / IEEE 802.16 system. We also propose some considerations for the spectrum efficiency...
The radio resource management functionality plays an important role in new OFDMA based networks. The control of the network resource division among the users is performed by packet scheduling functionality based on maximizing cell coverage and capacity while satisfying certain quality of service constrains. In order to mitigate inter-cell and co-channel interference problems in OFDMA cellular networks,...
For the downlink of MIMO-OFDM system, a novel proportional fairness with joint space-time-frequency scheduling is proposed in this paper. On one hand, by space-time-frequency scheduling one can gain multiuser spatial multiplexing on the same subcarrier in one timeslot. On the other hand, with modified traditional proportional fairness, the system can provide QoS guarantee for various service types...
MaxSNR scheduling is acknowledged as the reference resource allocation for multiuser OFDM wireless networks. Well adapted to the wireless environment, MaxSNR opportunistically considers the channel state and fights the multipath fading negative effects. Taking advantage of multiuser diversity, MaxSNR scheduling is well-known for maximizing the global cell throughput. However, throughput maximization...
This paper proposes a channel-adapted and buffer-aware scheduling algorithm in LTE wireless communication system. The scheme allocates system resource jointly PHY-MAC layer according to CQI feed back with the uplink, considers UE buffer status to avoid buffer overflow, and guarantees certain fairness among users. Comparing with traditional scheduling algorithms such as RR, PO and PF, the simulation...
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