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QoE Enhancement of Audio-Video Reliable Groupcast with IEEE 802.11aa
Toshiro NUNOME Takuya KOMATSU
IEICE TRANSACTIONS on Communications
Publication Date: 2018/07/01
Online ISSN: 1745-1345
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.