Optimization of a QoS Aware Cross-Layer Scheduler by Packet Aggregation

  • Andreas Könsgen
  • Md. Shahidul Islam
  • Andreas Timm-Giel
  • Carmelita Görg
Part of the IFIP International Federation for Information Processing book series (IFIPAICT, volume 284)

In this paper, the performance of a QoS-aware two-stage cross-layer scheduler utilising a MIMO channel for transmission is considered along with TDMA, OFDMA and SDMA channel access methods which serves a number of users with QoS-constrained data flows. OFDMA and SDMA allow a parallel transmission of packets which can have different transmission durations due to varying physical bit rates and packet lengths. The data flow with the longest packet slows down the other flows because they have to wait until the transmission is complete. This paper proposes packet aggregation where waiting times are reduced by transmitting more than one packet per user if airtime is left. It is shown that this method significantly enhances the QoS parameters throughput and delay. For constant-size packets, shorter delays can be achieved than for variable-size packets. Aggregating non-consecutive packets further enhances the performance, however the packets have to be buffered at the receiver to put them into the correct order.


Mobile Station Mobile Networking Channel Capacity Packet Size Packet Length 
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Copyright information

© International Federation for Information Processing 2008

Authors and Affiliations

  • Andreas Könsgen
    • 1
  • Md. Shahidul Islam
    • 1
  • Andreas Timm-Giel
    • 1
  • Carmelita Görg
    • 1
  1. 1.Communication NetworksCenter for Computing Technologies (TZI) University of BremenGermany

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