Patent Number: 6,434,396

Title: Method in a cellular radio communications system

Abstract: 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).

Inventors: Rune; Johan (Lindingo, SE)

Assignee: Telefonaktiebolaget L M Ericsson

International Classification: H04Q 7/38 (20060101); H04Q 7/22 (20060101); H04B 015/00 (); H04B 001/38 ()

Expiration Date: 08/13/2010