# US 2018/0324866 A1 · Method and apparatus for performing access barring check

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- Number: US 2018/0324866 A1
- Document ID: US20180324866A1
- Status: Published application
- Kind: A1
- Application number: 15/971,565
- Filed: 2018-05-04
- Published: 2018-11-08
- Earliest claimed: 2017-05-05
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Youngdae LEE; Hyunjung CHOE
- Web page: https://patentgrep.com/patent/US20180324866A1

## CPC

- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 48/02: Access restriction performed under specific conditions
- H04W 76/18: Management of setup rejection or failure
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 88/02: Terminal devices
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Provided are a method for a user equipment (UE) to perform access barring check in a wireless communication system, and an apparatus supporting the same. The method may include: performing the access barring check for a cell; if access to the cell is barred, starting a barring timer; and if a coverage enhancement (CE) level of the UE is changed in the cell, stopping the started barring timer.

## Claims

### Claim 1

A method for performing, by a user equipment (UE), access barring check in a wireless communication system, the method comprising:
performing the access barring check for a cell;
if access to the cell is barred, starting a barring timer; and
if a coverage enhancement (CE) level of the UE is changed in the cell, stopping the started barring timer.

### Claim 2 (depends on 1)

The method of claim 1, wherein the CE level of the UE is changed in the cell while the started barring timer is running.

### Claim 3 (depends on 1)

The method of claim 1, wherein the CE level of the UE is a first CE level when the access barring check is performed for the cell, and
wherein after access to the cell is barred, the CE level of the UE is changed in the cell from the first CE level to a second CE level while the started barring timer is running.

### Claim 4 (depends on 1)

The method of claim 1, wherein a radio resource control (RRC) layer of the UE informs a non-access stratum (NAS) layer of the UE that barring is alleviated.

### Claim 5 (depends on 4)

The method of claim 4, wherein after stopping the started barring timer, the RRC layer of the UE informs the NAS layer of the UE that barring is alleviated.

### Claim 6 (depends on 4)

The method of claim 4, wherein the NAS layer of the UE triggers RRC connection establishment procedure for the changed CE level.

### Claim 7 (depends on 1)

The method of claim 1, wherein the CE level of the UE is changed in the cell after stopping the started barring timer.

### Claim 8 (depends on 1)

The method of claim 1, wherein the CE level of the UE is changed in the cell before stopping the started barring timer.

### Claim 9 (depends on 1)

The method of claim 1, further comprising:
receiving, from a network, a system information block (SIB) including barring information per the CE level.

### Claim 10 (depends on 9)

The method of claim 9, wherein the access barring check is performed for the cell, based on the CE level of the UE and the barring information corresponding to the CE level of the UE.

### Claim 11

A user equipment (UE) performing access barring check in a wireless communication system, the UE comprising:
a memory; a transceiver; and
a processor, connected to the memory and the transceiver, that:
performs the access barring check for a cell;
if access to the cell is barred, starts a barring timer; and
if a coverage enhancement (CE) level of the UE is changed in the cell, stops the started barring timer.

### Claim 12 (depends on 11)

The UE of claim 11, wherein the CE level of the UE is changed in the cell while the started barring timer is running.

### Claim 13 (depends on 11)

The UE of claim 11, wherein the CE level of the UE is a first CE level when the access barring check is performed for the cell, and
wherein after access to the cell is barred, the CE level of the UE is changed in the cell from the first CE level to a second CE level while the started barring timer is running.

### Claim 14 (depends on 11)

The UE of claim 11, wherein a radio resource control (RRC) layer of the UE informs a non-access stratum (NAS) layer of the UE that barring is alleviated.

### Claim 15 (depends on 14)

The UE of claim 14, wherein after stopping the started barring timer, the RRC layer of the UE informs the NAS layer of the UE that barring is alleviated.

### Claim 16 (depends on 14)

The UE of claim 14, wherein the NAS layer of the UE triggers RRC connection establishment procedure for the changed CE level.

### Claim 17 (depends on 11)

The UE of claim 11, wherein the CE level of the UE is changed in the cell after stopping the started barring timer.

### Claim 18 (depends on 11)

The UE of claim 11, wherein the CE level of the UE is changed in the cell before stopping the started barring timer.

### Claim 19 (depends on 11)

The UE of claim 11, wherein the processor that:
controls the transceiver to receive, from a network, a system information block (SIB) including barring information per the CE level.

### Claim 20 (depends on 19)

The UE of claim 19, wherein the access barring check is performed for the cell, based on the CE level of the UE and the barring information corresponding to the CE level of the UE.