Feedback control for multicast or broadcast services

A mobile terminal receiving via an air interface of a mobile communication system a multicast or broadcast service transmitted or forwarded by a feedback control entity, the mobile terminal cooperating with the feedback control entity to reduce uplink traffic in the mobile communication system and comprising:

• a receiver configured to receive the multicast or broadcast service via a unidirectional downlink channel using an unreliable transport protocol and a Real Time Protocol (RTP), wherein the receiver is configured to further receive a parameter comprising a probability value based on which the mobile terminal decides whether to provide RTCP feedback to the feedback control entity,
• a processor configured to decide whether to provide the feedback for the multicast or broadcast service to the feedback control entity based on the received parameter and to establish a bearer for providing the feedback to the feedback control entity, only in case it is decided to provide the feedback, and
• a transmitter configured to transmit the feedback which indicates reception statistics of said multicast or broadcast service to the feedback control entity via said established bearer.

A feedback control entity for controlling transmission of feedback of a plurality of mobile terminals receiving a multicast or broadcast service transmitted or forwarded by the feedback control entity via an air interface of a mobile communication system, the feedback control entity operating to reduce uplink traffic in the mobile communication system and comprising:

• a transmitter configured to transmit or forward data of the multicast or broadcast service to at least one of the mobile terminals via a unidirectional downlink channel using an unreliable transport protocol and a Real Time Protocol (RTP),
• a processor configured to determine parameters comprising a probability value allowing a mobile terminal to decide whether to provide feedback to the feedback control entity, wherein the transmitter is configured to transmit said parameters to at least a subset of said plurality of mobile terminals receiving the multicast or broadcast service, and is further configured to establish, for each mobile terminal that decides to provide the feedback, a respective bearer for providing the feedback from a respective mobile terminal to the feedback control entity, and
• a receiver for receiving the feedback from another subset of said plurality of mobile terminals having received said parameters via the respective established bearers.