A Two-Stage QoS Aware Scheduler for Wireless LANs Based on MIMO-OFDMA-SDMA Transmission
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 hardwareindependent 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.
scheduling MIMO quality-of-service multiple access
Andreas K(o)nsgen Waldemar Herdt Hongyu Wang Andreas Timm-Giel Ronald B(o)hnke Carmelita G(o)rg
Communication Networks Center for Computing Technologies (TZI) University of Bremen Germany
国际会议
首届无线通信跨层设计国际学术研讨会(1st International Workshop on Cross Layer Design)
济南
英文
1-5
2007-09-20（万方平台首次上网日期，不代表论文的发表时间）