Patent ID: 7876771

Claim:
A method for avoiding collisions on a random access channel of a telecommunication system providing Multimedia Broadcast/Multicast Services (MBMS) to a plurality of subscribing user equipments, said method comprising the steps of: dividing an MBMS session into a first period for transmission of MBMS data to user equipments and a subsequent second period for receiving feedback information, by determining a delay time period for each subscribing user equipment after the lapse of which said user equipment starts transmission of feedback information on the random access channel for acknowledgement of successfully received MBMS data portions; and selecting a preamble signature for use on a sub-channel of a random access channel for the subscribing user equipments; then, forwarding said respective delay time periods and preamble signature to the user equipments; then transmitting one or more MBMS data portions on a downlink channel to the group of subscribing user equipments; and receiving feedback information from the plurality of user equipments.