US 9,814,029 B2
Radio communication system, radio station, radio terminal, network apparatus, bearer control method, and computer readable medium
Hisashi Futaki, Tokyo (JP); and Hiroaki Aminaka, Tokyo (JP)
Assigned to NEC Corporation, Tokyo (JP)
Appl. No. 14/430,969
Filed by NEC Corporation, Tokyo (JP)
PCT Filed Jun. 19, 2013, PCT No. PCT/JP2013/003805
§ 371(c)(1), (2) Date Mar. 25, 2015,
PCT Pub. No. WO2014/054202, PCT Pub. Date Apr. 10, 2014.
Claims priority of application No. 2012-223178 (JP), filed on Oct. 5, 2012.
Prior Publication US 2015/0245325 A1, Aug. 27, 2015
Int. Cl. H04W 84/12 (2009.01); H04W 72/04 (2009.01); H04L 5/00 (2006.01); H04W 76/02 (2009.01)
CPC H04W 72/042 (2013.01) [H04L 5/001 (2013.01); H04L 5/0032 (2013.01); H04W 72/04 (2013.01); H04W 72/0413 (2013.01); H04W 76/025 (2013.01)] 48 Claims
OG exemplary drawing
 
1. A radio communication system comprising:
a first radio station configured to operate a first cell;
a second radio station configured to operate a second cell;
a radio terminal configured to aggregate the first cell with the second cell; and
an upper network configured to perform signal transmission or reception to or from the radio terminal via the first and second radio stations, wherein
the upper network is configured to set up a control bearer for sending at least a control signal related to the radio terminal between the upper network and the first radio station, and is configured to set up a second bearer for transferring user data related to the radio terminal between the upper network and the second radio station, and
the first radio station is configured to trigger the second radio station to set up the second bearer by sending a request to the second radio station, and
the second radio station is configured to send, in response to the request from the first radio station, a setup request for the second bearer to the upper network.