US 12,256,271 B2
Radio communication system, radio station, radio terminal, communication control method, and computer-readable medium
Hisashi Futaki, Tokyo (JP); and Hiroaki Aminaka, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Filed by NEC Corporation, Tokyo (JP)
Filed on Jun. 27, 2022, as Appl. No. 17/849,806.
Application 17/849,806 is a continuation of application No. 16/730,074, filed on Dec. 30, 2019, granted, now 11,382,002.
Application 16/730,074 is a continuation of application No. 14/655,936, granted, now 10,548,051, issued on Jan. 28, 2020, previously published as PCT/JP2013/007044, filed on Dec. 2, 2013.
Claims priority of application No. 2012-288212 (JP), filed on Dec. 28, 2012.
Prior Publication US 2022/0330101 A1, Oct. 13, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 36/00 (2009.01); H04B 7/024 (2017.01); H04W 36/08 (2009.01); H04W 36/28 (2009.01); H04W 76/15 (2018.01); H04W 76/28 (2018.01); H04W 24/10 (2009.01); H04W 36/02 (2009.01); H04W 48/20 (2009.01); H04W 74/00 (2009.01); H04W 76/10 (2018.01); H04W 84/04 (2009.01); H04W 88/06 (2009.01); H04W 88/08 (2009.01)
CPC H04W 36/0016 (2013.01) [H04B 7/024 (2013.01); H04W 36/00692 (2023.05); H04W 36/087 (2023.05); H04W 36/28 (2013.01); H04W 76/15 (2018.02); H04W 76/28 (2018.02); H04W 24/10 (2013.01); H04W 36/00695 (2023.05); H04W 36/02 (2013.01); H04W 36/0235 (2023.05); H04W 48/20 (2013.01); H04W 74/004 (2013.01); H04W 76/10 (2018.02); H04W 84/045 (2013.01); H04W 88/06 (2013.01); H04W 88/08 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A radio terminal comprising:
a memory storing instructions; and
at least one processor configured to process the instructions to:
communicate with a radio station system comprising a first cell operated by a first radio station as a Primary Cell and either a second cell operated by a second radio station as a Secondary Cell or a third cell operated by a third radio station as the Secondary Cell, wherein
the at least one processor is configured to:
in a case where the second cell is operated as the Secondary Cell, and the radio terminal receives, from the first radio station, a Radio Resource Control (RRC) Connection Reconfiguration message indicating that the Secondary cell is to be changed from the second cell to the third cell while maintaining a RRC connection established between the radio terminal and the first radio station,
keep Data Radio Bearer information related to the second cell and release a configuration of the second cell, and
transmit, to the first radio station, a RRC Connection Reconfiguration complete message.