“…In this direction, many recent publications [11][12][13][14][15][16][17] analyze the suitability of IMS as the appropriate solution in an all-IP scenario paying special attention on how the IMS may help mobile operators to preserve the current status quo so that they maintain their central role in service provisioning without becoming mere bit carriers. In closer relation to this paper, we can find a number of works [18,19] concentrating on the problem of multimedia service provisioning, and more particularly on video streaming, over IMS infrastructures. Even closer to our objectives we can find some previous works dealing, directly or indirectly, with P2MP multimedia delivery both in mobile-to-mobile and mobile-to-Internet scenarios [20,21].…”