Conference Paper

Efficient Packet Scheduling Schemes for Multiantenna Packet Radio Downlink.

DOI: 10.1109/AICT.2009.73 Conference: The Fifth Advanced International Conference on Telecommunications, AICT 2009, 24-28 May 2009, Venice/Mestre, Italy
Source: DBLP

ABSTRACT In this paper, we propose fairness-oriented dual-stream multiple-input multiple-output (MIMO) packet scheduling schemes for future multi-antenna packet radio systems. In general, multi-user transmit-receive schemes allow users to be scheduled on different parallel streams on the same time-frequency resource. Based on that, implementations of more intelligent scheduling schemes that are aware of the instantaneous state of the radio channel require utilization of time, frequency and spatial domain resources in an efficient manner. Stemming from the earlier advanced proportional fair (PF) scheduler studies, we extend the developments to dual-stream MIMO packet radios. Furthermore, we investigate the resulting fairness distribution among users together with efficiency in increasing the system capacity in terms of throughput and coverage by simulating practical orthogonal frequency division multiple access (OFDMA) system environment with MIMO functionality in micro and macro cell scenarios. As a concrete example, we demonstrate that by using new multi-user scheduling schemes, significant coverage improvements in the order of 30% can be obtained at the expense of only 14% throughput loss. Furthermore, the user fairness is also greatly increased, by more than 18%, when measured using Jainpsilas fairness index.

0 Bookmarks
 · 
53 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, we study and analyze the performance of advanced OFDM packet scheduling techniques with given QoS requirements under the 3GPP UTRAN Long Term Evolution (LTE) framework. Stemming from our previous studies in scheduling algorithm developments, we show that the main radio resource management (RRM) performance measures such as fairness, throughput and coverage are efficiently controlled by proper scheduling priority metric calculations utilizing time-, frequency- and spatial domains. The proposed scheduling algorithms are able to meet the higher layer quality of service (QoS) targets, taking into account Constant Bit Rate (CBR) traffic scenarios with Guaranteed Bit Rate (GBR) constrains as well as instantaneous user channel conditions. Moreover, we demonstrate that by using such algorithms, significant coverage improvements in the order of 40% can be obtained at the expense of 8% total throughput loss compared to more traditional scheduling approaches. Furthermore, the user fairness is also greatly increased, by more than 15% when measured using Jain's fairness index.
    Broadband Network and Multimedia Technology (IC-BNMT), 2010 3rd IEEE International Conference on; 11/2010
  • [Show abstract] [Hide abstract]
    ABSTRACT: In this paper we analyze the performance of advanced OFDM packet scheduling techniques based on 3GPP UTRAN Long Term Evolution (LTE) framework for high velocity scenarios. Based on our previous investigations in system performance analysis, we demonstrate that packet scheduler being part of the whole radio resource management (RRM) process has a major impact on it. On the other hand high user velocities further imply additional system performance limitations due to the introduction of reporting overhead. Therefore, we investigate the resulting fairness distribution among users together with the achievable radio system performance in terms of throughput, coverage and fairness distribution, by simulating practical OFDMA cellular system environment with MIMO functionality in Macro cell Best effort traffic scenario. As a concrete example, we demonstrate that by using the advanced fairness-oriented multi-user scheduling schemes, significant coverage improvements in the order of 30% can be obtained by achieving the same cell throughput. Furthermore, the user fairness is also greatly increased, by more than 25%, when measured using Jain's fairness index.
    01/2011;
  • [Show abstract] [Hide abstract]
    ABSTRACT: 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, soft frequency reuse with different power mask patterns is used. Stemming from our previous studies in scheduling algorithm developments, we extend the usability of packet scheduling techniques with built in transmit power considerations in the overall priority metrics calculations and scheduling decisions. In this paper, we investigate the system performance of combined soft frequency reuse schemes with advanced power-aware packet scheduling algorithms for further optimization between user fairness and cell throughput. As a concrete example, we demonstrate that by using such technique significant coverage improvements in the order of 30% can be obtained at the expense of only 14% throughput loss. Furthermore, the user fairness is also greatly increased, by more than 18%, when measured using Jain's fairness index.
    Future Network and Mobile Summit, 2010; 07/2010