Telefonaktiebolaget Lm Ericsson (Publ)

Ralf Tönjes

Ralf Keller

Thorsten Lohmar

Frank Hundscheidt

Jörg Huschke

Uwe Horn

To improve transmission of digital broadcast information, there is proposed a method of transmitting digital broadcast information from a main transmitter () to at least one repeater (). There is generated a composite digital broadcast signal carrying first digital broadcast information according to a first digital broadcast specification (DVB-T) and second digital broadcast information according to a second digital broadcast specification (DVB-H). The composite digital broadcast is then broadcasted such that the second digital broadcast information (DVB-H) is sent in a transmission mode used for transmission of the first digital broadcast information (DVB-T).

Transmission of composite digital broadcast information

The invention relates to a method for performing a flexible multicast of multicast data to a multicast group within a telecommunication system wherein the multicast data is provided by a broadcast/multicast server and transferred to the users registered to the multicast group by means of channels. In the invention multi-channel multicast groups (B,B, . . . ) are provided. Each multi-channel multicast group offers at least one channel wherein a channel transports content. The availability and configuration of the multi-channel multicast group is announced to the users by means of an announcement multicast group (A). The user either initiates the changing to an announced multi channel multicast group or the user is forced by the operator to change in case the operator wants to control the allocation of resources.

Growing community of inventors

Osnabrück, Germany

Ralf Tönjes