A method, in a Global System for Mobile communications/Enhanced Data rates for GSM Evolution, further referred to as GSM/EDGE compliant mobile radio network, to allow to reduce latency of media or multimedia real-time transmissions of Radio Link control/Medium Access Control further referred to as RLC/MAC radio blocks delivered to a higher protocol layer, including the steps of: - setting, by the network, resources for establishing at least a unidirectional temporary flow of radio blocks defined at RLC/MAC protocol, called Temporary Block Flow further referred to as TBF, comprised of two peer entities comprising a transmitting entity and a receiving entity (MS, BSS) acting as RLC endpoints, each one having a receiver that receives RLC/MAC radio blocks and a transmitter that transmits RLC/MAC radio blocks; - transmitting RLC/MAC radio blocks, by the transmitting entity (MS, BSS), within a transmit window; - receiving RLC/MAC radio blocks, by the receiving entity (BSS, MS), within a receive window and, in case of not correctly received radio blocks, sending back Acknowledge/NotAcknowledge further referred to as ACK/NACK signalling messages to inform the transmitting entity of the status of the reception; - non-exhaustively retransmitting, by the transmitting entity (MS, BSS) upon reception of ACK/NACK signalling messages, the radio blocks not correctly received by the receiving entity; - re-assembling, by the receiving entity (BSS, MS), and in-sequence delivering to the higher protocol layer all correctly received RLC/MAC radio blocks, considering a radio block not yet correctly received as definitively lost when it falls outside of the receive window. characterized in that further includes the step of: - transmitting, by the network, a notification message to both said transmitting and receiving entities (MS, BSS) to address the size of the transmit/receive window inside a range of predetermined values including values lower than 64 RLC/MAC radio blocks. - setting, by the network, resources for establishing at least a unidirectional temporary flow of radio blocks defined at RLC/MAC protocol, called Temporary Block Flow further referred to as TBF, comprised of two peer entities comprising a transmitting entity and a receiving entity (MS, BSS) acting as RLC endpoints, each one having a receiver that receives RLC/MAC radio blocks and a transmitter that transmits RLC/MAC radio blocks; - transmitting RLC/MAC radio blocks, by the transmitting entity (MS, BSS), within a transmit window; - receiving RLC/MAC radio blocks, by the receiving entity (BSS, MS), within a receive window and, in case of not correctly received radio blocks, sending back Acknowledge/NotAcknowledge further referred to as ACK/NACK signalling messages to inform the transmitting entity of the status of the reception; - non-exhaustively retransmitting, by the transmitting entity (MS, BSS) upon reception of ACK/NACK signalling messages, the radio blocks not correctly received by the receiving entity; - re-assembling, by the receiving entity (BSS, MS), and in-sequence delivering to the higher protocol layer all correctly received RLC/MAC radio blocks, considering a radio block not yet correctly received as definitively lost when it falls outside of the receive window. - transmitting, by the network, a notification message to both said transmitting and receiving entities (MS, BSS) to address the size of the transmit/receive window inside a range of predetermined values including values lower than 64 RLC/MAC radio blocks.