System information transmission method and base station, and system information reception method and user equipment
A core network to which a cell of a base station can be connected may not be specified to be one. For example, a cell may be connected to an EPC, may be connected to a next-generation core network, or may be connected to both an EPC and a next-generation core network. The base station may transmit core network information relating to a core network to which the cell is connected, on the cell. A user equipment may determine whether to camp on the cell on the basis of the core network information.
1. A method of receiving system information by a user equipment (UE) from a base station, the method comprising:
performing a cell search;
receiving the system information on a found cell based on the cell search,
wherein the found cell is a long term evolution (LTE) cell connected to an evolved packet core (EPC), and
wherein the system information includes core network information regarding whether the found cell is connected to a next generation core network (NCN) or not; and
based on the core network information informing that the found cell is connected to the NCN:
selecting a core network type among the EPC and the NCN; and
performing an access attempt on the found cell according to the core network type,
wherein the core network type is selected by a non-access stratum (NAS) layer of the UE.
2. The method of claim 1 ,
wherein the base station is a base station of evolved universal terrestrial radio access network (E-UTRAN).
3. The method of claim 1 , further comprising:
based on the UE supporting the core network type to which the found cell is connected and having uplink data to transmit, establishing a radio resource control (RRC) connection with the base station; and
transmitting the uplink data on the found cell.
4. The method of claim 1 ,
wherein the core network information is forwarded from a radio resource control (RRC) layer of the UE to the NAS layer of the UE.
5. A user equipment (UE) for receiving system information from a base station, the UE comprising:
a transceiver, and
a processor configured to control the transceiver, the processor configured to:
perform a cell search;
control the transceiver to receive the system information on a found cell based on the cell search,
wherein the found cell is a long term evolution (LTE) cell connected to an evolved packet core (EPC), and
wherein the system information includes core network information regarding whether the found cell is connected to a next generation core network (NCN) or not; and
based on the core network information informing that the found cell is connected to the NCN:
select a core network type among the EPC and the NCN; and
perform an access attempt on the found cell according to the core network type,
wherein the core network type is selected by a non-access stratum (NAS) layer of the UE.
6. The UE of claim 5 ,
wherein the base station is a base station of evolved universal terrestrial radio access network (E-UTRAN).
7. The UE user equipment of claim 5 ,
wherein the processor is further configured to:
based on the UE supporting the core network to which the found cell is connected and having uplink data to transmit, establish a radio resource control (RRC) connection with the base station and control the transceiver to transmit the uplink data on the found cell.
8. The UE of claim 5 ,
wherein the core network information is forwarded from a radio resource control (RRC) layer of the UE to the NAS layer of the UE.