UE capability signaling to support 5G new radio (NR) in unlicensed spectrum (NR-U)
A method for UE capability signaling to support NR-U is proposed. A UE transfers UE capability information to a mobile communication network, and the UE capability information includes information regarding whether the UE supports system information acquisition on an unlicensed cell. The UE receives configuration from a serving cell of the mobile communication network, and the configuration includes information for system information acquisition of one or more unlicensed cells on a frequency. The UE acquires system information of the one or more unlicensed cells on the frequency and reports the acquired system information to the serving cell, or stores the acquired system information in the UE.
1. A method, comprising:
transferring User Equipment (UE) capability information to a mobile communication network by a UE, wherein the UE capability information comprises a first indicator indicates whether the UE supports acquiring Master Information Block (MIB) on an unlicensed cell, a second indicator indicates whether the UE supports acquiring System Information Block type 1 (SIB1) on the unlicensed cell, and a third indicator indicates whether the UE supports acquisition of Cell Global Identity (CGI) information from a neighboring unlicensed cell;
receiving configuration from a serving cell of the mobile communication network by the UE, wherein the configuration comprises information for system information acquisition of one or more unlicensed cells on a frequency, wherein the unlicensed cells are New Radio (NR)-based unlicensed neighboring cells, and the serving cell is an NR-based licensed cell;
acquiring system information of the one or more unlicensed cells on the frequency by the UE; and
reporting the acquired system information to the serving cell by the UE, or storing the acquired system information in the UE.
2. The method of claim 1 , wherein the UE capability information is set and reported per frequency band.
3. The method of claim 1 , wherein the system information comprises at least one of a Master Information Block (MIB) and a System Information Block type 1 (SIB1).
4. The method of claim 3 , wherein the SIB1 comprises a Cell Global Identity (CGI) comprising at least one of a Public Land Mobile Network Identity (PLMN ID) and a Physical Cell Identity (PCI).
5. The method of claim 1 , further comprising:
receiving a UE capability enquiry message from the mobile communication network by the UE; and
sending a UE capability information message to the mobile communication network by the UE in response to receiving the UE capability enquiry message;
wherein the UE capability information is transferred via the UE capability information message.
6. The method of claim 1 , wherein the reporting of the acquired system information to the serving cell is performed in response to the UE being requested by the serving cell for CGI reporting.
7. The method of claim 1 , wherein the storing of the acquired system information in the UE is performed in response to a handover of the UE from the serving cell to one of the unlicensed cells.
8. The method of claim 1 , wherein the storing of the acquired system information in the UE is performed in response to the UE receiving an indication that the system information of the one or more unlicensed cells on the frequency has changed.
9. A User Equipment (UE), comprising:
a transmitter that transfers UE capability information to a mobile communication network, wherein the UE capability information comprises a first indicator indicates whether the UE supports acquiring Master Information Block (MIB) on an unlicensed cell, a second indicator indicates whether the UE supports acquiring System Information Block type 1 (SIB1) on the unlicensed cell, and a third indicator indicates whether the UE supports acquisition of Cell Global Identity (CGI) information from a neighboring unlicensed cell;
a receiver that receives configuration from a serving cell of the mobile communication network, wherein the configuration comprises information for system information acquisition of one or more unlicensed cells on a frequency, and the receiver acquires system information of the one or more unlicensed cells on the frequency, wherein the unlicensed cells are New Radio (NR)-based unlicensed neighboring cells, and the serving cell is an NR-based licensed cell; and
a system information handling circuit that reports the acquired system information to the serving cell, or stores the acquired system information in the UE.
10. The UE of claim 9 , wherein the UE capability information is set and reported per frequency band or per frequency band combination.
11. The UE of claim 9 , wherein the system information comprises at least one of a Master Information Block (MIB) and a System Information Block type 1 (SIB1).
12. The UE of claim 11 , wherein the SIB1 comprises a Cell Global Identity (CGI) comprising at least one of a Public Land Mobile Network Identity (PLMN ID) and a Physical Cell Identity (PCI).
13. The UE of claim 9 , wherein the UE receives a UE capability enquiry message from the mobile communication network, and sends a UE capability information message to the mobile communication network in response to receiving the UE capability enquiry message; and wherein the UE capability information is transferred via the UE capability information message.
14. The UE of claim 9 , wherein the reporting of the acquired system information to the serving cell is performed in response to the UE being requested by the serving cell for CGI reporting.
15. The UE of claim 9 , wherein the storing of the acquired system information in the UE is performed in response to a handover of the UE from the serving cell to one of the unlicensed cells.
16. The UE of claim 9 , wherein the storing of the acquired system information in the UE is performed in response to the UE receiving an indication that the system information of the one or more unlicensed cells on the frequency has changed.