Method for operating a mobile radiotelephone network

Abstract

A method is proposed for operating a mobile radio network (1), which permits an error-free exchange of packet data units in the event of a connection change (700) between a mobile unit (10) and superordinate network units (50, 55). In this context, useful data is transmitted in the mobile radio network (1) between the mobile unit (10) and a first radio base station (25), the useful data being combined to form packet data units prior to its transmission. For the transmission of the packet data units, transmission-specific information describing an instantaneous state of the transmission is stored both in the mobile unit (10) and in a first network unit (50) superordinate to the first radio base station (25). In response to the connection change (700) of the mobile unit (10) from the first radio base station (25) to a second radio base station (30) having a second superordinate network unit (55), the transmission-specific information stored in the first superordinate network unit (50) is transmitted to the second superordinate network unit (55) in order to continue the transmission after the connection change essentially directly from its instantaneous state. Prior to the connection change (700), the transmission of the packet data units from the first radio base station (25) to the mobile unit (10) is halted by the first superordinate network unit (50). With the transmission-specific information from the first superordinate network unit (50), a first identifier of the packet-data unit expected as next from the mobile unit (10) in the first superordinate network unit (50) is transmitted to the second superordinate network unit (55). A first connection-change packet data unit which includes the first identifier is sent by the second superordinate network unit (55) to the mobile unit (10).

Dependencies are inferred from the claim text.