# US 10,772,038 B2 · Method whereby terminal selects PLMN in wireless communication system, and device for same

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- Number: US 10,772,038 B2
- Document ID: US10772038B2
- Status: Granted
- Kind: B2
- Application number: 16/570,650
- Filed: 2019-09-13
- Published: 2020-01-02
- Granted: 2020-09-08
- Earliest claimed: 2015-02-04
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Taehun Kim; Jaehyun Kim; Jinsook Ryu; Hyunsook Kim; Laeyoung Kim
- Web page: https://patentgrep.com/patent/US10772038B2

## CPC

- H04W 48/18: Selecting a network or a communication service
- H04L 67/51: Discovery or management thereof, e.g. service location protocol [SLP] or web services
- H04L 67/52: specially adapted for the location of the user terminal
- H04W 4/023: {using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds}
- H04W 60/00: Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
- H04W 60/001: {Registration rejection or failure}
- H04W 48/02: Access restriction performed under specific conditions
- H04W 84/042: {Public Land Mobile systems, e.g. cellular systems}
- H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A method for a User Equipment (UE) in a wireless communication system, the includes transmitting, by the UE which is outside of coverage, a first message for registration to a first cell on a selected first Public Land Mobile Network (PLMN), wherein the first PLMN which is not included in a list related to forbidden PLMNs; receiving, by the UE, a second message related to registration failure with the first PLMN; selecting, by the UE, a second PLMN; and transmitting, by the UE, a third message for registration to a second cell on the selected second PLMN, wherein zero or more PLMNs, which are included in the list related to forbidden PLMNs, are excluded in a selection of the second PLMN, and wherein the first PLMN with which the registration has failed is further excluded in the selection of the second PLMN, although the first PLMN is not included in the list related to forbidden PLMNs.

## Claims

### Claim 1

A method for a User Equipment (UE) in a wireless communication system, the method comprising:
transmitting, by the UE which is outside of coverage, a first message for registration to a first cell on a selected first Public Land Mobile Network (PLMN), wherein the first PLMN is not included in a list related to forbidden PLMNs;
receiving, by the UE, a second message related to registration failure with the first PLMN;
selecting, by the UE, a second PLMN; and
transmitting, by the UE, a third message for registration to a second cell on the selected second PLMN,
wherein zero or more PLMNs, which are included in the list related to forbidden PLMNs, are excluded in a selection of the second PLMN, and
wherein the first PLMN with which the registration has failed is further excluded in the selection of the second PLMN, although the first PLMN is not included in the list related to forbidden PLMNs.

### Claim 2 (depends on 1)

The method according to claim 1, wherein each of the first message and the third message is a location registration request.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the second message includes information about a cause of registration rejection.

### Claim 4 (depends on 3)

The method according to claim 3, wherein the information about the cause indicates ‘PLMN not allowed’.

### Claim 5

A User Equipment (UE) of outside of coverage in a wireless communication system, the UE comprising:
a memory; and
a processor coupled with the memory,
wherein the UE transmits a first message for registration to a first cell on a selected first Public Land Mobile Network (PLMN), the first PLMN being not included in a list related to forbidden PLMNs, receives a second message related to registration failure with the first PLMN, selects a second PLMN, and transmits a third message for registration to a second cell on the selected second PLMN,
wherein zero or more PLMNs, which are included in the list related to forbidden PLMNs, are excluded in a selection of the second PLMN, and
wherein the first PLMN with which the registration has failed is further excluded in the selection of the second PLMN, although the first PLMN is not included in the list related to forbidden PLMNs.

### Claim 6 (depends on 5)

The UE according to claim 5, wherein each of the first message and the third message is a location registration request.

### Claim 7 (depends on 5)

The UE according to claim 5, wherein the second message includes information about a cause of registration rejection.

### Claim 8 (depends on 7)

The UE according to claim 7, wherein the information about the cause indicates ‘PLMN not allowed’.