A radio communication scheme applicable to UMTS providing packet data
services, such as multimedia broadcast and multicast services (MBMS), to
one or more users by modifying (augmenting) certain existing radio
communication protocols while employing a new transport channel (a
point-to-multipoint DSCH), and/or by establishing new physical downlink
shared channels (C-PDSCH and D-PDSCH). An RLC layer is provided in a
single CRNC so that the same MBMS can be transmitted to a plurality of
terminals via a point-to-multipoint DSCH, without having to repetitively
provide many RLC layers in many SRNCs. Alternatively, a C-PDSCH (physical
downlink shared channel for control) and a D-PDSCH (physical downlink
shared channel for data) are established to allow periodic transmission
of MBMS, permitting users to simultaneously access one or more MBMS.