Abstract
In this paper, we propose a flexible and fairness-oriented packet scheduling approach for 3GPP UTRAN long term evolution (LTE) type packet radio systems, building on the ordinary proportional fair (PF) scheduling principle and channel quality indicator (CQI) feedback. Special emphasis is also put on practical feedback reporting mechanisms, including the effects of mobile measurement and estimation errors, reporting delays, and CQI quantization and compression. The performance of the overall scheduling and feedback re-porting process is investigated in details, in terms of cell throughput, coverage and resource allocation fairness, by using extensive quasistatic cellular system simulations in practical OFDMA system environment with frequency reuse of 1. The performance simulations show that by using the proposed modified PF ap-proach, significant coverage improvements in the order of 50% can be obtained at the expense of only 10-15% throughput loss, for all reduced feedback reporting schemes. This reflects highly improved fairness in the radio resource management (RRM) compared to other existing schedulers, without essentially com-promising the cell capacity. Furthermore, we demonstrate the improved functionality increase in radio re-source management for UE’s utilizing multi-antenna diversity receivers.
Highlights
Development of new radio interface technologies for beyond 3G cellular radio systems with support to high data rates, low latency and packet-optimised radio access has led to the use of OFDM/OFDMA
We propose a flexible and fairness-oriented packet scheduling approach for 3GPP UTRAN long term evolution (LTE) type packet radio systems, building on the ordinary proportional fair (PF) scheduling principle and channel quality indicator (CQI) feedback
Compared to plain frequency domain scheduling, we extend the studies by deploying both time domain and frequency domain scheduling steps, together with proper metrics, that as a whole can more efficiently utilise the provided yet limited feedback information from all the user equipments (UEs)
Summary
Development of new radio interface technologies for beyond 3G cellular radio systems with support to high data rates, low latency and packet-optimised radio access has led to the use of OFDM/OFDMA. Each mobile station can measure the effective signal-to-interference-plus-noise-ratio (SINR), per active subcarrier or block of subcarriers, and send back the obtained channel state to the base station for downlink radio resource management. The amount of the feedback information needs to be limited and is subject to different errors and delays, affecting the overall system-level performance. Another important aspect in scheduling and resource allocation process is fairness, implying that users with less favourable channel conditions should anyway be given some reasonable access to the radio spectrum [4,5,6,13,14,15,16,17,18]. This is especially important in serving users at, e.g., cell edges in cellular networks
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