Patent ID: 7453838

Claim:
A method of operating a mobile wireless network within which user data is transmitted between a mobile station and a first base station, the user data being combined into data units prior to a transmission of the data units, the method comprising: storing transmission-specific information related to an instantaneous state of the transmission of the data units in both the mobile station and in a first network unit, the first network unit being at a level that is higher than a level of the first base station; transmitting the transmission-specific information stored in the first network unit to a second network unit of a second base station when the mobile station relocates from the first base station to the second base station, the second network unit having a level that is higher than the level of the second base station to continue the transmission of the data units after the mobile station relocates from the first base station to the second base station; establishing a connection for the transmission of data units between the mobile station and the first base station; and transmitting first signaling information from the mobile station to the first network unit before or during the establishment of the connection to notify the first network unit whether the transmission-specific information will be transmitted to a new higher-level network unit when there is a relocation to a base station having a new higher-level network unit that is different from the first network unit.