Apparatus and method related to dual connectivity

Patent metadata

Field	Value
Publication number	US-11310852-B2
Application number	US-201615747810-A
Country	US
Kind code	B2
Filing date	Aug 4, 2016
Priority date	Aug 11, 2015
Publication date	Apr 19, 2022
Grant date	Apr 19, 2022

Abstract

An apparatus and a method which make it possible to suppress occurrence of an unnecessary operation in a case of an SCG bearer. The apparatus includes: a communication processing unit configured to communicate with a terminal apparatus over a Master Cell Group (MCG) bearer for dual connectivity of the terminal apparatus; a request unit configured to request a secondary base station, which communicates with the terminal apparatus over a Secondary Cell Group (SCG) bearer for the dual connectivity, to report activity-related information related to an activity of the terminal apparatus in an SCG of the secondary base station; and an information acquisition unit configured to acquire the activity-related information reported by the secondary base station.

First claim

What is claimed is:

1. A base station which communicates with a terminal apparatus over a Master Cell Group (MCG) bearer for dual connectivity, the base station comprising:
a transmitter configured to transmit an Addition Request message to a secondary base station which communicates with the terminal apparatus over a Secondary Cell Group (SCG) bearer for the dual connectivity, the Addition Request message including a first information element, an Expected UE Behavior information element, and an inactivity timer, wherein the first information element indicates a request for the secondary base station to report information related to an activity of the terminal apparatus in a Secondary Cell Group (SCG) which is a group of serving cells associated with the secondary base station,
wherein the first information element is different from the inactivity timer, and
wherein the first information element does not include the inactivity timer; and
a receiver configured to receive the information transmitted by the secondary base station.

2. The base station according to claim 1 , wherein the information indicates whether the terminal apparatus is inactive or not.

3. The base station according to claim 1 ,
wherein the Addition Request message and a first message are transmitted on a first procedure, the first message being an acknowledge message which corresponds to the Addition Request message, and
wherein the information included in a second message is received on a second procedure, the second procedure being different from the first procedure.

4. The base station according to claim 3 ,
wherein the information is transmitted when the activity of the terminal apparatus is changed, if the acknowledge message is transmitted.

5. The base station according to claim 1 ,
wherein the information is transmitted when the activity of the terminal apparatus is changed.

6. The base station according to claim 1 ,
wherein the information is transmitted when the activity of the terminal apparatus is changed to be inactive.

7. The base station according to claim 1 , wherein the secondary base station sends the information in a case of changing activity state of the terminal apparatus, the information indicating the terminal apparatus is active.

8. A base station which communicates with a terminal apparatus over a Secondary Cell Group (SCG) bearer for dual connectivity, the base station comprising:
a receiver configured to receive an Addition Request message from a master base station which communicates with the terminal apparatus over a Master Cell Group (MCG) bearer for the dual connectivity, the Addition Request message including a first information element, an Expected UE Behavior information element, and an inactivity timer, wherein the first information element indicates a request to report information related to an activity of the terminal apparatus in a Secondary Cell Group (SCG) which is a group of serving cells associated with the base station, wherein the first information element is different from the inactivity timer, and wherein the first information element does not include the inactivity timer; and
a transmitter configured to transmit the information to the master base station.

9. The base station according to claim 8 , wherein the information indicates whether the terminal apparatus is inactive or not.

10. The base station according to claim 8 ,
wherein the Addition Request message and a first message are transmitted on a first procedure, the first message being an acknowledge message which corresponds to the Addition Request message, and
wherein the information included in a second message is received on a second procedure, the second procedure being different from the first procedure.

11. The base station according to claim 8 ,
wherein the information is transmitted when the activity of the terminal apparatus is changed.

12. The base station according to claim 8 ,
wherein the information is transmitted when the activity of the terminal apparatus is changed to be inactive.

13. The base station according to claim 8 , wherein the base secondary station sends the information in a case of changing activity state of the terminal apparatus, the information indicating the terminal apparatus is active.

14. A method for a base station, the method comprising:
communicating with a terminal apparatus over a Master Cell Group (MCG) bearer for dual connectivity;
transmitting an Addition Request message to a secondary base station which communicates with the terminal apparatus over a Secondary Cell Group (SCG) bearer for the dual connectivity, the Addition Request message separately including a first information element, an Expected UE Behavior information element, and an inactivity timer, wherein the first information element indicates a request for the secondary base station to report information related to an activity of the terminal apparatus in a Secondary Cell Group (SCG) which is a group of serving cells associated with the secondary base station, wherein the first information element is different from the inactivity timer, and wherein the first information element does not include the inactivity timer; and
receiving the information transmitted by the secondary base station.

15. The method according to claim 14 , wherein the information indicates whether the terminal apparatus is inactive or not.

16. The method according to claim 14 ,
wherein the Addition Request message and a first message are transmitted on a first procedure, the first message being an acknowledge message which corresponds to the Addition Request message, and
wherein the information included in a second message is received on a second procedure, the second procedure being different from the first procedure.

17. The method according to claim 16 ,
wherein the information is transmitted when the activity of the terminal apparatus is changed, if the acknowledge message is transmitted.

18. The method according to claim 14 ,
wherein the information is transmitted when the activity of the terminal apparatus is changed.

19. The method according to claim 14 ,
wherein the information is transmitted when the activity of the terminal apparatus is changed to be inactive.

20. The method according to claim 14 , transmitting, by the secondary base station, the information in a case of changing activity state of the terminal apparatus, the information indicating the terminal apparatus is active.

Assignees

• Nec Corp

Inventors

• Hayashi Sadafuku

Classifications

• H04W76/25 Primary

  Maintenance of established connections · CPC title

• H04W36/0027

  for a plurality of data sessions of end-to-end connections, e.g. multi-call or multi-bearer end-to-end data connections · CPC title

• H04W92/20

  between access points · CPC title

• H04W16/32

  Hierarchical cell structures · CPC title

• H04W76/30

  Connection release · CPC title