Multi-cell Cooperative Scheduling and Power Control in SC-FDMA Systems
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摘要: 該文針對長期演進(LTE)上行單載波頻分多址(SC-FDMA)多小區(qū)系統的性能受限于小區(qū)間干擾的問題，提出一種綜合考慮協作調度和功率控制的方案。該方法分步執(zhí)行小區(qū)間的協作調度和功率控制，首先調度各小區(qū)中的用戶，在此基礎上優(yōu)化用戶的發(fā)射功率。調度時首先估計小區(qū)間的干擾信息并分配頻率資源塊給每個小區(qū)內的用戶，在優(yōu)化用戶的發(fā)射功率時，同時考慮由于用戶功率改變所造成的目標小區(qū)和其他干擾小區(qū)性能的變化。進一步提出一種低復雜度功率控制方案，在優(yōu)化目標小區(qū)用戶的功率時，只考慮受目標小區(qū)干擾影響最大的幾個小區(qū)性能的變化，其他干擾小區(qū)性能的變化則通過引入補償因子來估計。計算機仿真驗證了該文所提方法在系統吞吐量和小區(qū)邊緣吞吐量方面的性能優(yōu)勢顯著。Abstract: Inter-cell interference is a major factor that limits the performance of multi-cell systems. In this paper, a cooperative scheduling and power control algorithm for Single-Carrier Frequency-Division Multiple Access (SC-FDMA) multi-cell systems is proposed to deal with the inter-cell interference in Long Term Evolution (LTE) uplink. It performs scheduling and power control for each cell separately, which schedules users first and then configures the transmit power for each user. The proposed algorithm performs scheduling by first estimating the inter-cell interference and then assigning resources to users. When optimizing the users transmit power, the performance variation of both the objective cell and other interfering cells is considered. Furthermore, a power control algorithm with low-complexity is proposed, which only considers the performance change of several cells interfered most by the objective cell and estimates the performance change of all other cells by introducing a compensation factor, when optimizing the transmit power of each user. Simulation results demonstrate the effectiveness of the proposed algorithm in cell average and cell edge throughput.
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Key words:
- Wireless communication /
- Long Term Evolution (LTE) /
- Uplink /
- Multi-cell /
- Scheduling /
- Power control
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