Method for selecting PLMN of terminal in wireless communication system and apparatus for same

• US 10,616,829 B2
• Filed: 02/02/2016
• Issued: 04/07/2020
• Est. Priority Date: 02/02/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Taehun, Kim, Jaehyun, Ryu, Jinsook, Kim, Hyunsook, Kim, Laeyoung
• Primary Examiner(s): Young, Steve R
• Application Number:
  US15/545,464
• Publication Number:
  US 20180007621A1
• Time in Patent Office: 1,526 Days
• Field of Search: None
• CPC Class Codes: H04W 48/02 Access restriction performed under specific conditions
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 60/00 Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
• CPC Class Codes: H04W 60/005 Multiple registrations, e.g. multihoming
• CPC Class Codes: H04W 76/23 Manipulation of direct-mode connections
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A method for a UE to perform public land mobile network (PLMN) selection associated with ProSe direct communication in a wireless communication system according to an embodiment of the present invention includes: selecting a PLMN; and registering with the PLMN, wherein the UE performs ProSe direct communication in the selected PLMN without executing PLMN selection any more, even if the UE fails to register with the selected PLMN, wherein ProSe direct communication in the selected PLMN is performed in a limited service state, wherein the UE is in the limited service state when the UE has not discovered a suitable cell, when the UE receives “PLMN not allowed” or when the UE receives “GPRS not allowed”.

Claims

1. A method for a user equipment (UE) to perform public land mobile network (PLMN) selection associated with proximity services (ProSe) direct communication in a wireless communication system, the method comprising:

camping, by the UE, on a first PLMN in a normal service state;

in response to the first PLMN not providing ProSe direct communication resources, selecting, by the UE, a second PLMN providing ProSe 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 failing of the registration on the second PLMN; and

performing, by the UE, the ProSe direct communication on the registration-failed second PLMN in a limited service state,

wherein the UE remains camped on the first PLMN in the normal service state and does not perform an additional PLMN selection during a duration of the ProSe direct communication in the registration-failed second PLMN, after entering the limited service state.

2. The method according to claim 1, wherein a cause of registration failure 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 failed registration with 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 ProSe selection is performed during the ProSe direct communication.

5. The method according to claim 1, wherein the second PLMN is not included in a list of “

forbidden PLMNs”

.

6. The method according to claim 5, wherein the second PLMN is not included in a list of “

PLMNs with E-UTRAN not allowed”

.

7. The method according to claim 5, wherein the second PLMN is included in a list of “

authorized PLMNs for ProSe direct communication”

.

8. A user equipment (UE) for performing public land mobile network (PLMN) selection associated with proximity services (ProSe) direct communication in a wireless communication system, the UE comprising:

a transceiver; and

a processor,

wherein the processor is configured to;

camp on a first PLMN in a normal service state,

in response to the first PLMN not providing ProSe direct communication resources, select a second PLMN providing ProSe direct communication resources,

perform a registration on the second PLMN,

receive a failed registration code of “

PLMN not allowed”

due to failing of the registration on the second PLMN, and

perform the ProSe direct communication on the registration-failed second PLMN in a limited service state, and

wherein the UE remains camped on the first PLMN in the normal service state and does not perform an additional PLMN selection during a duration of the ProSe direct communication in the registration-failed second PLMN, after entering the limited service state.

9. The UE according to claim 8, wherein the second PLMN is not included in a list of “

forbidden PLMNs”

.

10. The UE according to claim 8, wherein the second PLMN is not included in a list of “

PLMNs with E-UTRAN not allowed”

.

11. The UE according to claim 8, wherein the second PLMN is included in a list of “

authorized PLMNs for ProSe direct communication”

.