Method for selecting PLMN of terminal in wireless communication system and apparatus for same
A method for a user equipment (UE) to perform public land mobile network (PLMN) selection in a wireless communication system, and which includes selecting, by the UE, a first PLMN; in response to the first PLMN not providing direct communication resources, selecting, by the UE, a second PLMN providing direct communication resources; performing, by the UE, a registration on the second PLMN; receiving, by the UE, a failed registration code of “PLMN not allowed” due to a failing of the registration on the second PLMN; and performing, by the UE, the direct communication on the second PLMN in a limited service state. Further, the UE remains on the first PLMN based on a normal service state and the UE does not perform an additional PLMN selection during a duration of the direct communication in the second PLMN based on the limited service state.
1. A method for a user equipment (UE) to perform public land mobile network (PLMN) selection in a wireless communication system, the method comprising:
selecting, by the UE, a first PLMN;
in response to the first PLMN not providing direct communication resources, selecting, by the UE, a second PLMN providing direct communication resources;
performing, by the UE, a registration on the second PLMN;
receiving, by the UE, a failed registration code of “PLMN not allowed” due to a failing of the registration on the second PLMN; and
performing, by the UE, the direct communication on the second PLMN in a limited service state,
wherein the UE remains on the first PLMN based on a normal service state and the UE does not perform an additional PLMN selection during a duration of the direct communication in the second PLMN based on the limited service state.
2. The method according to claim 1 , wherein a cause of the failing of the registration on the second PLMN is received as a response to a location registration request sent to a cell to which the second PLMN belongs.
3. The method according to claim 1 , wherein a cause of the failing of the registration on the second PLMN is that the UE has not discovered a suitable cell in the second PLMN.
4. The method according to claim 1 , wherein the second PLMN is not included in a list of “forbidden PLMNs”.
5. The method according to claim 4 , wherein the second PLMN is not included in a list of “PLMNs with E-UTRAN not allowed”.
6. The method according to claim 4 , wherein the second PLMN is included in a list of “authorized PLMNs for direct communication”.
7. A user equipment (UE) for performing public land mobile network (PLMN) selection in a wireless communication system, the UE comprising:
a memory; and
a processor coupled to the memory,
wherein the processor is configured to:
select a first PLMN,
select a second PLMN providing direct communication resources in response to the first PLMN not providing direct communication resources,
perform a registration on the second PLMN,
receive a failed registration code of “PLMN not allowed” due to a failing of the registration on the second PLMN, and
perform the direct communication on the second PLMN in a limited service state, and
wherein the UE remains on the first PLMN based on a normal service state and the UE does not perform an additional PLMN selection during a duration of the direct communication in the second PLMN based on the limited service state.