US 12,010,745 B2
Telecommunications apparatus and methods for handling split radio bearers
Vivek Sharma, Basingstoke (GB); Brian Alexander Martin, Basingstoke (GB); Yuxin Wei, Basingstoke (GB); Hideji Wakabayashi, Basingstoke (GB); and Shinichiro Tsuda, Basingstoke (GB)
Assigned to SONY CORPORATION, Tokyo (JP)
Filed by Sony Corporation, Tokyo (JP)
Filed on Nov. 9, 2020, as Appl. No. 17/092,592.
Application 17/092,592 is a continuation of application No. 16/334,766, granted, now 10,834,771, previously published as PCT/EP2017/071772, filed on Aug. 30, 2017.
Claims priority of application No. 16191055 (EP), filed on Sep. 28, 2016.
Prior Publication US 2021/0058995 A1, Feb. 25, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 76/15 (2018.01); H04W 12/03 (2021.01); H04W 12/037 (2021.01); H04W 12/04 (2021.01); H04W 12/041 (2021.01); H04W 12/0431 (2021.01); H04W 76/20 (2018.01); H04W 80/02 (2009.01); H04W 88/08 (2009.01)
CPC H04W 76/15 (2018.02) [H04W 12/037 (2021.01); H04W 12/041 (2021.01); H04W 12/0431 (2021.01); H04W 76/20 (2018.02); H04W 80/02 (2013.01); H04W 88/085 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for use in a wireless telecommunications network including a core network; base stations supported by the core network and each providing wireless connectivity within at least one base station cell where the cells are arranged into a master cell group under control of a master base station and a secondary cell group under control of a secondary base station; and a terminal device configured to communicate wirelessly with the base stations including by the use of a split radio bearer receivable at the secondary base station for splitting between the secondary base station and the master base station before delivery to the terminal device, the method comprising:
in a case that the secondary base station exhausts a supply of unique parameter sets used in security ciphering of received split radio bearers, the secondary base station sending a notification to the master base station of a requirement to alter data handling resources allocated for handling split radio bearers received from the secondary base station in one or both of the master base station and the terminal device; and
the master base station, in response to the notification, operating to effect an alteration in the said data handling resources by re-establishing its radio link control protocol layer and resetting its medium access control protocol layer and sending a reconfiguration message to the terminal device to effect re-establishment of its radio link control protocol layer and resetting of its medium access control protocol layer.