Mbms acknowledgements on rach
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Abstract
The present invention relates to multicast communication systems and in particular to the implementation of a random access uplink channel, which can be used, e.g., for transmission of acknowledgement messages for received data. In order to prevent frequent collisions on said channel, the transmission of acknowledgement messages is spread at least over time or, additionally, with regard to another distinguishing channel property, e.g. a RACH sub-channel or RACH-signature.
65 Citations
14 Claims
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1-7. -7. (canceled)
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8. 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:
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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;
forwarding said respective delay time periods to the user equipments; and
,transmitting one or more MBMS data portions on a downlink channel to the group of subscribing user equipments. - View Dependent Claims (9, 12, 13, 14)
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10. A method in a user equipment of a telecommunication system subscribing to a Multimedia Broadcast/Multicast Service (MBMS), said method comprising the steps of:
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determining a delay time period;
transmitting, after the lapse of said delay time period, feedback information on the random access channel for acknowledgement of successfully received MBMS-data portions. - View Dependent Claims (11)
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Specification