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For delay-constrained applications such as video telephony, packet losses may result in excessive artifacts or freeze in the decoded video. We propose a simple and yet effective mechanism to detect and reduce channel-caused packet losses by adjusting the retry limit parameter of the IEEE 802.11 protocol while taking into account the delay requirement of the traffic. Since the retry limit is left configurable in the IEEE 802.11 standard and does not require cross-layer coordination, our scheme can be easily implemented and incrementally deployed. Experimental results of applying the proposed scheme to a WebRTC-based real-time video communication prototype show significant performance gain compared to the case where the retry limit is configured statically.<\/jats:p>","DOI":"10.1145\/2983634","type":"journal-article","created":{"date-parts":[[2016,11,15]],"date-time":"2016-11-15T13:35:02Z","timestamp":1479216902000},"page":"1-24","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":3,"title":["Congestion-Aware MAC Layer Adaptation to Improve Video Telephony over Wi-Fi"],"prefix":"10.1145","volume":"12","author":[{"given":"Wei","family":"Chen","sequence":"first","affiliation":[{"name":"Inter Digital"}]},{"given":"Liangping","family":"Ma","sequence":"additional","affiliation":[{"name":"Inter Digital"}]},{"given":"Chien-Chung","family":"Shen","sequence":"additional","affiliation":[{"name":"University of Delaware"}]}],"member":"320","published-online":{"date-parts":[[2016,11,15]]},"reference":[{"volume-title":"Proceedings of IEEE SECON. 1--9.","author":"Acharya P. 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