Abstract
Abstract Multicast is an efficient way of transmitting the same set of data to multiple interested users. WLANs do not provide any standardized solution for reliable data multicast. Multicast packets are delivered to multiple users as a simple broadcast service without support for Automatic Repeat Request. Hence, multicast transmission results in higher packet error rates. In order to improve the reliability of multicast delivery, a fixed low speed (robust) transmission mode is generally required. However, this results in the inefficient use of scarce and valuable bandwidth. This paper presents a reliable and efficient Wi-Fi multicast delivery solution for challenging outdoor applications. An Application Layer Forward Error Correction enabled data carousel is proposed for reliable multicast transmission over standard IEEE 802.11 WLANs. Field trials have been conducted to demonstrate and quantify system performance. Results show that the proposed system enhances user quality of experience while time efficiently utilising available bandwidth. The proposed interleaved carousel that is Raptor code enabled, attains 74.5% less download time than the traditional carousel, because of randomisation of errors and the protection of Raptor AL-FEC. 90% of users are able to download successfully a video file of 2.8MB within 12 sec, with multicasting using the Modulation and Coding Scheme (MCS) at 26Mb/s. Higher MCS modes become viable by exploiting the rateless properties of RaptorQ codes to radically enhance the reliably of multicast transmissions.
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