The Wireless Hierarchical Token Bucket: A Channel Aware Scheduler for 802.11 Networks

The paper proposes an architecture for a scheduling algorithm, to be integrated in IEEE 802.11 Access Points (AP), able to take into account, besides the transport service class required by the destination user, the channel quality experimented by the destination mobile STAtion (STA). The relevance of this topic is due to the observation that when one or more STAs experiment poor radio channel conditions, they increase the time spent to transmit a single packet, due to the retransmission of corrupted frames and the adoption of a transmission techniques at lower bit rate, leading to an inefficient use of the shared medium. These phenomena have as a consequence the worsening of the performance of all the STAs sharing the wireless medium independently of their radio channel conditions. The adoption of a scheduling algorithm able to manage information on channel quality permits to reduce these effects, not penalizing the STAs experimenting good channel condition and, as a consequence, th...

• Type: Conference
• Year: 2005
• Where: WOWMOM
• Authors: Rosario Giuseppe Garroppo, Stefano Giordano, Stefano Lucetti, E. Valori
• Keywords: Channel Conditions, Channel Quality, Radio Channel Conditions, WOWMOM 2005