IP Library › Granted Patent US 12,369,116
Granted Patent B2
US 12,369,116 · App. 18/738,185 · Granted Jul 22, 2025

Radio communication system, radio station, radio terminal, communication control method, and non-transitory computer readable medium

Inventors: Hisashi Futaki (Tokyo, JP); Hiroaki Aminaka (Tokyo, JP)
Assignee: NEC Corporation
H04W52/0216H04L1/0045H04L5/001H04L5/0035H04L5/0098H04W48/00H04W48/12H04W52/0229H04W72/23H04W76/28Y02D30/70
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Quick Facts
Patent No.
US 12,369,116
App. No.
18/738,185
Granted
Jul 22, 2025
Kind
B2
Abstract

A radio terminal ( 3 ) can perform carrier aggregation using a first cell ( 10 ) of a first radio station ( 1 ) and a second cell ( 20 ) of a second radio station ( 2 ). The first radio station ( 1 ) or the second radio station ( 2 ) transmits constraint information to the radio terminal ( 3 ). The constraint information contains an information element necessary to specify a reception constraint and/or transmission constraint related to the first cell ( 10 ) and/or the second cell ( 20 ) when the carrier aggregation is performed. The reception/transmission constraint is a constraint related to downlink signal reception/uplink signal transmission by the radio terminal over one or more subframe periods of the primary cell ( 10 ) and the secondary cell ( 20 ). It is thus, for example, possible to contribute to reduction in wasteful power consumption in the radio terminal in the carrier aggregation of a plurality of cells served by different radio stations.

Claims (18)

1. A radio terminal comprising:

a memory storing instructions; and

at least one processor configured to process the instructions to:

perform Dual Connectivity using a first cell of a first radio station as a primary cell and a second cell of a second radio station as a secondary cell; and

receive, from the second radio station, a Radio Resource Control (RRC) message generated by the second radio station and including information indicating a period related to the secondary cell by using a Signaling Radio Bearer established directly between the second radio station and the radio terminal.

2. The radio terminal according to claim 1 , wherein the period related to uplink.

3. A second radio station configured to serve a second cell, the second radio station comprising:

a processor configured to perform Dual Connectivity in which a radio terminal uses a first cell of a first radio station as a primary cell and the second cell as a secondary cell; and

a transceiver configured to send, to the radio terminal, a Radio Resource Control (RRC) message generated by the second radio station and including information indicating a period related to the secondary cell by using a Signaling Radio Bearer established directly between the second radio station and the radio terminal.

4. The second radio station according to claim 3 , wherein the period related to uplink.

5. A method for a radio terminal comprising:

performing Dual Connectivity using a first cell of a first radio station as a primary cell and a second cell of a second radio station as a secondary cell; and

receiving, from the second radio station, a Radio Resource Control (RRC) message generated by the second radio station and including information indicating a period related to the secondary cell by using a Signaling Radio Bearer established directly between the second radio station and the radio terminal.

6. The method according to claim 5 , wherein the period related to uplink.

7. A method for a second radio station configured to serve a second cell, the method comprising:

performing Dual Connectivity in which a radio terminal uses a first cell of a first radio station as a primary cell and the second cell as a secondary cell; and

sending, to the radio terminal, a Radio Resource Control (RRC) message generated by the second radio station and including information indicating a period related to the secondary cell by using a Signaling Radio Bearer established directly between the second radio station and the radio terminal.

8. The method according to claim 7 , wherein the period related to uplink.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 2, 2025
From: NEC CORPORATION
To: VTECT IP INC.
Reel/Frame 072995/0600 →
Priority Claims (1)
JP 2013-033703 · Feb 22, 2013 · national
Continuity (7)
Continuation 18083642 · Dec 19, 2022
Continuation 17153243 · Jan 20, 2021
Continuation 16798541 · Feb 24, 2020
Continuation 16682308 · Nov 13, 2019
Continuation 16193429 · Nov 16, 2018
Continuation 14768088
Related Publication 20240334327A1 · Oct 3, 2024
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