中国邮电高校学报(英文) ›› 2007, Vol. 14 ›› Issue (2): 45-50.doi: 1005-8885 (2007) 02-0045-06

• Network • 上一篇    下一篇

Resource allocation algorithm with cross-layer design for DiffServ-based OFDM systems

李晓辉;韩明;易克初;,田斌   

  1. Xidian University
  • 收稿日期:2006-11-22 修回日期:1900-01-01 出版日期:2007-06-30

Resource allocation algorithm with cross-layer design for DiffServ-based OFDM systems

LI Xiao-hui; HAN Ming;YI Ke-chu;TIAN Bin   

  1. Xidian University
  • Received:2006-11-22 Revised:1900-01-01 Online:2007-06-30

摘要:

According to the quality of service (QoS) requirements of differentiated service (DiffServ), a cross-layer resource allocation algorithm for multi-user orthogonal frequency division multiplexing(OFDM)systems is presented. The constant rate is maintained by adjusting the power dynamically for the voice traffics with high priority, whereas the fairness amongst the data traffics is guaranteed by weighted fairness queued (WFQ) algorithm. The two above-mentioned strategies are used for video traffics to realize variable data rate with the constraint of the minimum rate. Combing all these methods, both the throughput and the fairness are ensured when there are multiple users in the OFDM system. Simulation results indicate the validity of the proposed algorithm, which can work well even if the SNR is less than 0 dB.

关键词:

OFDM;cross-layer;QoS;DiffServ

Abstract:

According to the quality of service (QoS) requirements of differentiated service (DiffServ), a cross-layer resource allocation algorithm for multi-user orthogonal frequency division multiplexing(OFDM)systems is presented. The constant rate is maintained by adjusting the power dynamically for the voice traffics with high priority, whereas the fairness amongst the data traffics is guaranteed by weighted fairness queued (WFQ) algorithm. The two above-mentioned strategies are used for video traffics to realize variable data rate with the constraint of the minimum rate. Combing all these methods, both the throughput and the fairness are ensured when there are multiple users in the OFDM system. Simulation results indicate the validity of the proposed algorithm, which can work well even if the SNR is less than 0 dB.

Key words:

OFDM;cross-layer; QoS;DiffServ

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