Abstract
The present disclosure in an aspect provides a method of managing mobility of a UE in a wireless communication system, including 1) determining in an RRC inactive state (an RRC inactive mode), whether to change a serving cell that is currently attached, 2) when determining to change the serving cell, receiving a system information from a target cell, and checking, based on the system information, whether a base station that controls the serving cell is identical to or different from a base station that controls the target cell, and 3) depending on identity or difference between the base station that controls the target cell and the base station that controls the serving cell, performing i) releasing an RRC-connection to thereby transition into an idle state, or ii) a cell change procedure to the target cell.
Technologies
Product
Use Cases
Services
Claim
1. A method for managing mobility of a mobile terminal in telecommunication network, the method comprising:
performing, by the mobile terminal in a Radio Resource Control (RRC)-INACTIVE state, measurements for a serving cell and at least one neighboring cell to enable a cell reselection process, wherein the mobile terminal in the RRC-INACTIVE state maintains a connection with an Access and Mobility Management Function (AMF) of a core network during the cell reselection process; and
choosing, by the mobile terminal in the RRC-INACTIVE state, a cell to camp from the serving cell and at least one neighboring cell according to the measurements and a cell reselection criteria; and
wherein a serving base station of the serving cell performs a paging of the mobile terminal in the RRC-INACTIVE state in response to the serving base station receiving downlink data associated with the mobile terminal in the RRC-INACTIVE state from a User Plane Function (UPF), of the core network.
2. The method of claim 1, further comprising:
monitoring, by the mobile terminal in the RRC-INACTIVE state, system information from the cell chosen in the cell reselection process.
3. The method of claim 1, further comprising:
by the serving base station, notifying the AMF of the core network that delivery of the downlink data has failed when the serving base station fails to contact the mobile terminal.
4. The method of claim 3, wherein, when delivery of the downlink data to the mobile terminal has failed and the cell chosen in the cell reselection process is controlled by another base station, the downlink data is forwarded to the other base station.
5. The method of claim 4, wherein the serving base station sends the downlink data to the AMF of the core network, when the serving base station fails to contact the mobile terminal when attempting delivery of the downlink data.
6. The method of claim 4, wherein the serving base station sends the downlink data to the UPF of the core network, when the serving base station fails to contact the mobile terminal when attempting delivery of the downlink data.
7. The method of claim 1, wherein the serving base station keeps context information of the mobile terminal in the RRC INACTIVE state.
8. The method of claim 1, further comprising:
by the mobile terminal, accessing to the serving base station in order to inform the serving base station of the cell chosen in the cell reselection process.
9. The method of claim 7, wherein the serving base station updates the context information of the mobile terminal in the RRC INACTIVE state in response to notification of the cell chosen in the cell reselection process.
10. The method of claim 1, wherein maintaining the connection between the mobile terminal in the RRC-INACTIVE state and the AMF of the core network during the cell reselection process includes:
maintaining a Non-Access Stratum (NAS) signaling connection between the mobile terminal and the AMF.
11. The method of claim 10, further comprising:
attempting, by the serving base station and based on receiving the downlink data, to activate the RRC-connected state with the mobile terminal.
12. A base station supporting mobility of a mobile terminal in telecommunication network, wherein the mobile terminal in a Radio Resource Control (RRC)-INACTIVE state is allowed to choose a suitable cell to camp from a serving cell and at least one neighboring cell according to a cell reselection criteria by performing measurements for the serving cell and the at least one neighboring cell to enable a cell reselection process, the base station comprising:
means for receiving downlink data associated with the mobile terminal in the RRC-INACTIVE state from User Plane Function (UPF), of the core network; and
means for performing a paging in order to reach the mobile terminal in the RRC-INACTIVE state in response to receiving the downlink data associated with the mobile terminal,
wherein the mobile terminal in the RRC-INACTIVE state maintains a connection with an Access and Mobility Management Function (AMF) of a core network during the cell reselection process.
13. The base station of claim 12, further comprising:
means for notifying the AMF of the core network when the base station fails to contact the mobile terminal when attempting delivery of the downlink data.
14. The base station of claim 13, wherein, when delivery of the downlink data has failed and another base station controls the cell chosen in the cell reselection process, the downlink data is forwarded to the other base station.
15. The base station of claim 13, further comprising:
means for sending the downlink data to the AMF of the core network, when the base station fails to contact the mobile terminal when attempting delivery of the downlink data.
16. The base station of claim 14, further comprising:
means for sending the downlink data to the UPF of the core network, when the first base station fails to contact the mobile terminal when attempting delivery of the downlink data.
17. The base station of claim 12, further comprising:
means for keeping context information of the mobile terminal in the RRC INACTIVE state.
18. The base station of claim 17, wherein further comprising:
means for updating the context information of the mobile terminal in the RRC INACTIVE state in response to notification of the cell chosen in the cell reselection process.
19. The base station of claim 12, wherein the mobile terminal in the RRC-INACTIVE state maintains a Non-Access Stratum (NAS) signaling connection between the mobile terminal and the AMF.
20. A system comprising:
user equipment (UE); and
a base station communicating with the UE;
wherein the UE is configured to:
enter a Radio Resource Control (RRC)-INACTIVE state such that a signaling connection is maintained between the UE and an Access and Mobility Management Function (AMF) of a core network,
perform, based on the signaling connection is maintained between the UE and the AMF, measurements for a serving cell associated with the base station and at least one neighboring cell, and
select one cell from the serving cell and at least one neighboring cell based on the measurements, and
wherein the base station is configured to:
page the UE based on receiving downlink data for the UE, and
forward the downlink data when the base station is unable to contact the UE.
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Note:
The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.