QoE Enhancement of Audio-Video Reliable Groupcast with IEEE 802.11aa

Toshiro NUNOME  Takuya KOMATSU  

IEICE TRANSACTIONS on Communications   Vol.E101-B   No.7   pp.1645-1652
Publication Date: 2018/07/01
Publicized: 2018/01/22
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2017CQP0002
Type of Manuscript: Special Section PAPER (Special Section on Communication Quality in Wireless Networks)
wireless LAN,  IEEE 802.11aa,  groupcast,  audio and video transmission,  QoE,  

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This paper enhances the QoE of audio and video multicast transmission over a wireless LAN by means of reliable groupcast schemes. We use GCR (GroupCast with Retries) Unsolicited Retry and GCR Block ACK as reliable groupcast schemes; they are standardized by IEEE 802.11aa. We assume that a wireless access point transmits audio and video streams to several terminals connected to the access point by groupcast. We compare three schemes: Groupcast with EDCA (Enhanced Distributed Channel Access), GCR Unsolicited Retry and GCR Block ACK. We perform computer simulations under various network conditions to assess application-level QoS and evaluate QoE by a subjective experiment. As a result, we find that the most effective scheme depends on network conditions.