The centralized architecture of IEEE 802.15.3 MAC results in several problems in ultra-wideband (UWB) applications
so the WiMedia alliance specifies a new MAC—ECMA-368 MAC. The paper concen- trates on the distributed architecture which makes the protocol well suited for low power
ad-hoc connec- tivity and P2P mobility in UWB high rate WPAN. This paper also discusses the problems of the MAC protocol and gives improvement suggestions in the end.