A two-stage QoS aware scheduler for wireless LANs based on MIMO-OFDMA-SDMA transmission

Start Page
5
End Page
9
Article Number
4379026
Citation
International Workshop on Cross Layer Design, IWCLD 2007: 4379026, 5-9 (2007)
Contribution to Conference
1st International Workshop on Cross Layer Design, IWCLD 2007  
Publisher DOI
10.1109/IWCLD.2007.4379026
Scopus ID
2-s2.0-49749115772
Publisher
IEEE
In this paper, a QoS-aware cross-layer scheduler for wireless LANs is introduced which can handle parallelised transmissions which are provided by OFDMA or SDMA. The scheduler includes two stages: In the hardware-independent stage, data flows are selected according to their QoS requirements such as throughput and delay. In the hardware-dependent stage, the channel resources are adaptively allocated to the flows according to the user priorities. All flows with a sufficiently high channel capacity are transmitted in parallel by assigning different OFDMA subcarriers or different spatial subchannels to the users. It is shown that the proposed QoS aware scheduler efficiently uses the channel resources in case of TDMA, OFDMA or SDMA and meets the quality-of-service requirements of time-critical flows under varying load and channel conditions.
Subjects
MIMO
Multiple access
Quality-of-service
Scheduling
DDC Class
004: Informatik