A raptor enabled data carousel for enhanced file delivery and QoS in 802.11 multicast networks

An Adaptive Raptor Enabled Data Carousel for File Delivery in 802.11 Multicast Networks

“…This may not be the case in reality, for example, users can be static or spend long time at some locations. In that case the percentage of covered users can be much lower compared to a mobile scenario as seen in [7]. It can be seen from the figure below that the adaptive system minimises the average download time while it provides coverage for all users.…”

“…10 compares the percentage of satisfied users versus the download time for the adaptive FEC carousel and the conventional interleaved FEC carousel system where the MCS mode is fixed and SF does not affect the system performance (i.e. for the traditional interleaved Raptor AL-FEC carousel, the only parameter that can be configured is MCS mode [7]). The results indicate that lower MCS modes provide greater coverage (percentage of satisfied users) at the expense of longer download times.…”

“…The AP locations were optimised to provide higher coverage while using minimum number of APs. The detailed information can be found in our previous work [7].…”

“…This property makes Raptor codes desirable for carousel-based services since the probability of receiving duplicate symbols can be reduced significantly. Our previous works in [6], [7] proposed an AL-FEC (based on RaptorQ (RQ) codes [8]) enhanced data carousel for use in outdoor 802.11 multicast wireless LANs.…”