Telefonaktiebolaget Lm Ericsson (publ)

Ingela Ericsson

Dirk Gerstenberger

Joakim Bergström

Peter Hans Edlund

Peter Edlund

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.

MBMS acknowledgements on RACH

A method and user equipment in a mobile telecommunications system for conducting a multimedia broadcast/multicast service (MBMS) session. An MBMS-uplink channel is introduced for transmitting from the user equipment, MBMS participation requests prior to the session and acknowledgment messages when MBMS messages are received. Relevant charging information is collected from the user equipment using broadcast/multicast services when an acknowledgment message is received. The telecommunication system then sends a decoding key to the user equipment for decoding at least a part of the data that is broadcast by the MBMS service.

Method and arrangement in a telecommunication system

A method in a cellular telecommunications network in which at least one Localized Service Area, LSA, has been specified, each LSA comprising one or more cells, comprises the steps of determining if information regarding an LSA has been changed, identifying at least one subscriber belonging to this LSA, and transmitting change information to said at least one subscriber belonging to the LSA to upgrade information on a SIM card held by this subscriber. Preferably an indicator is set to indicate if the subscriber belonging to the LSA needs the update information for the type of change made and transmitting update information only if there is such a need. For example, the list of cells belonging to an LSA only needs to be updated if cell information is stored on the SIM card. A node for carrying out the method is also disclosed.

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Bromma, Sweden

Ingela Ericsson