| 摘要 |
The present invention relates to a method in a cellular radio communications system of minimising the set-up delay for a mobile terminated message, which is divided into one or more data units (DU1 - DUi). The inventive method is carried out by multicasting the message (DU1 - DUi) to at least two selected base stations (BS1 - BS4) in the vicinity of the mobile station (MS). Thereafter, at least one first data unit (DU1) of the message (DU1 - DUi) is simultaneously transmitted in an initial signal (P(DU1)), which is sent out from the base stations (BS1 - BS4) and directed to the mobile station (MS). Any subsequent data units (DU2 - DUi) in the message (DU1 - DUi) are unicast (BS2; CHX(DU2) - CHX(DUi)) to the mobile station (MS), via one of the originally selected base stations (BS2). The mobile station (MS) returns a positive acknowledgement (ACK) after each correctly received data unit (DU1 - DUi).
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