Fast cell setup for dual connectivity
Provided are a method for fast cell setup. According to an embodiment of the present disclosure, the method includes receiving a secondary cell group (SCG) configuration from a first network node, wherein the SCG configuration includes information on secondary cells related to a second network node, identifying at least one valid cells among the secondary cells, and selecting a primary secondary cell (PSCell) among the valid cells.
1. A method performed by a wireless device adapted to operate in a wireless communication system, the method comprising:
receiving a secondary cell group (SCG) configuration from a first network node,
wherein the SCG configuration includes information on secondary cells related to a second network node;
receiving a radio resource control (RRC) release message from a first network node,
wherein the RRC release message includes a suspend configuration;
entering an RRC_INACTIVE state based on the suspend configuration included in the RRC release message;
storing the SCG configuration in the RRC_INACTIVE state;
identifying at least one valid cell from among the cells based on validity criteria,
wherein the RRC release message includes the validity criteria;
determining a primary secondary cell (PSCell) from among the at least one valid cell;
transmitting an RRC resume complete message including information about the at least one valid cell to the first network node; and
performing a PSCell addition with the PSCell based on the stored SCG configuration.
2. The method of claim 1 , wherein the validity criteria includes at least one of a channel quality, a predefined validity area, a timing advance (TA), or a validity timer.
3. The method of claim 1 , wherein the SCG configuration includes information on candidate cells.
4. The method of claim 3 , further comprising:
measuring channel quality of the candidate cells.
5. The method of claim 1 , further comprising:
determining a secondary cell (SCell) related to the second network node; and
performing a SCell addition with the SCell.
6. The method of claim 1 , further comprising:
performing a random access channel (RACH) procedure with the PSCell.
7. The method of claim 6 , wherein the RACH procedure is performed when it is determined that a TA of the PSCell is not valid.
8. The method of claim 1 , wherein the wireless device communicates with at least one of a mobile terminal, a network or autonomous vehicles other than the wireless device.
9. A wireless device adapted to operate in a wireless communication system, the wireless device comprising:
a memory;
a transceiver; and
a processor, operably coupled to the memory and the transceiver, and configured to perform operations comprising:
receiving a secondary cell group (SCG) configuration from a first network node,
wherein the SCG configuration includes information about cells related to a second network node;
receiving a radio resource control (RRC) release message from a first network node,
wherein the RRC release message includes a suspend configuration;
entering an RRC_INACTIVE state based on the suspend configuration included in the RRC release message;
storing the SCG configuration in the RRC_INACTIVE state;
identifying at least one valid cell from among the cells based on validity criteria,
wherein the RRC release message includes the validity criteria;
determining a primary secondary cell (PSCell) from among the at least one valid cell;
transmitting an RRC resume complete message including information about the at least one valid cell to the first network node; and
performing a PSCell addition with the PSCell based on the stored SCG configuration.
10. The wireless device of claim 9 , wherein the validity criteria includes at least one of a channel quality, a predefined validity area, a timing advance (TA), or a validity timer.