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LTE evolved Multimedia Broadcast/Multicast Service (eMBMS) is an attractivesolution for video delivery to very large groups in crowded venues. However,deployment and management of eMBMS systems is challenging, due to the lack ofrealtime feedback from the User Equipment (UEs). Therefore, we present theDynamic Monitoring (DyMo) system for low-overhead feedback collection. DyMoleverages eMBMS for broadcasting Stochastic Group Instructions to all UEs.These instructions indicate the reporting rates as a function of the observedQuality of Service (QoS). This simple feedback mechanism collects very limitedQoS reports from the UEs. The reports are used for network optimization,thereby ensuring high QoS to the UEs. We present the design aspects of DyMo andevaluate its performance analytically and via extensive simulations.Specifically, we show that DyMo infers the optimal eMBMS settings withextremely low overhead, while meeting strict QoS requirements under differentUE mobility patterns and presence of network component failures. For instance,DyMo can detect the eMBMS Signal-to-Noise Ratio (SNR) experienced by the 0.1%percentile of the UEs with Root Mean Square Error (RMSE) of 0.05% with only 5to 10 reports per second regardless of the number of UEs.

DyMo: Dynamic Monitoring of Large Scale LTE-Multicast Systems