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Through wireless multicast transmission various users can receive the same information which is transmitted at the same radio resource. A resource can be understood in various ways such as a time-slot, a particular frequency or a spatial location. This form of transmission is very useful, for example, in the digital TV application, where several users of a particular cell generate a demand for data on the same channel. In the case of UTRAN and its evolution, the multicast services are specified by the MBMS standard, which defines resource allocation and transmission procedures specific for multicasting. One particular bottleneck of wireless multicast services is the retransmission of erroneously received packets.
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