# US 11,122,503 B2 · Method and apparatus for inter-RAT cell selection mechanism in NB-IOT

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- Number: US 11,122,503 B2
- Document ID: US11122503B2
- Status: Granted
- Kind: B2
- Application number: 16/790,606
- Filed: 2020-02-13
- Published: 2020-08-20
- Granted: 2021-09-14
- Earliest claimed: 2019-02-14
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Hyunjung Choe; Sunghoon Jung; Hongsuk Kim
- Web page: https://patentgrep.com/patent/US11122503B2

## CPC

- H04W 48/20: Selecting an access point
- H04W 4/80: Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
- H04W 48/16: Discovering, processing access restriction or access information
- H04W 48/18: Selecting a network or a communication service
- H04W 72/56: based on priority criteria
- H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W 4/46: for vehicle-to-vehicle communication [V2V]
- H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC]
- H04W 4/90: Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
- H04W 84/042: {Public Land Mobile systems, e.g. cellular systems}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method and apparatus for inter-RAT cell selection mechanism in NB-IOT in a wireless communication system is provided. A wireless device receives a configuration related to periodic uplink transmission. A wireless device performs the periodic uplink transmission on a suitable cell. A wireless device selects other suitable cell, based on a periodicity of the periodic uplink transmission. A wireless device performs the periodic uplink transmission on the selected suitable cell.

## Claims

### Claim 1

A method performed by a wireless device in a wireless communication system, the method comprising:
receiving a configuration related to periodic uplink transmission;
performing a cell selection procedure;
camping on a NarrowBand Internet of Things (NB-IoT) cell based on the cell selection procedure;
configuring a periodic search timer based on a periodicity of the periodic uplink transmission;
performing the periodic uplink transmission on the NB-IoT cell;
entering to an any cell selection state upon expiry of the periodic search timer;
performing a cell reselection procedure, while in the any cell selection state;
camping on another cell based on the cell reselection procedure; and
continuing the periodic uplink transmission on the another cell,
wherein (1) the periodic search timer has an interval time of N times of the periodic uplink transmission and (2) N is a natural number,
wherein the periodic search timer starts a duration for prohibiting cell selection before one transmission of the periodic uplink transmission is performed.

### Claim 2 (depends on 1)

The method of claim 1, wherein the another cell is selected based on priority of radio access technology (RAT) including the another cell.

### Claim 3 (depends on 1)

The method of claim 1, wherein the another cell is selected based on priority of frequency including the another cell.

### Claim 4 (depends on 1)

The method of claim 1, wherein the cell reselection procedure is triggered upon expiry of the periodic search timer.

### Claim 5 (depends on 1)

The method of claim 1, wherein the cell reselection procedure includes,
performing a public land mobile network (PLMN) selection.

### Claim 6 (depends on 1)

The method of claim 1, wherein the method further comprises,
receiving, from the NB-IoT cell, information of RAT and/or frequency priority,
wherein the cell reselection procedure is based on the received information.

### Claim 7 (depends on 1)

The method of claim 1, wherein the another cell is a cell with a RAT other than an NB-IoT.

### Claim 8 (depends on 1)

The method of claim 1, wherein the wireless device is in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.

### Claim 9

A wireless device in a wireless communication system comprising:
a transceiver;
a memory; and
at least one processor operatively coupled to the transceiver and the memory, and configured to:
control the transceiver to receive a configuration related to periodic uplink transmission;
perform a cell selection procedure;
camp on a NarrowBand Internet of Things (NB-IoT) cell based on the cell selection procedure;
configure a periodic search timer based on a periodicity of the periodic uplink transmission;
control the transceiver to perform the periodic uplink transmission on the NB-IoT cell;
enter to an any cell selection state upon expiry of the periodic search timer;
perform a cell reselection procedure, while in the any cell selection state;
camp on another cell based on the cell reselection procedure; and
control the transceiver to continue the periodic uplink transmission on the another cell,
wherein (1) the periodic search timer has an interval time of N times of the periodic uplink transmission and (2) N is a natural number,
wherein the periodic search timer starts a duration for prohibiting cell selection before one transmission of the periodic uplink transmission is performed.

### Claim 10

A non-transitory computer-readable medium having stored thereon a plurality of instructions, which, when executed by a processor of a wireless device, cause the wireless device to:
receive a configuration related to periodic uplink transmission;
perform a cell selection procedure;
camp on a NarrowBand Internet of Things (NB-IoT) cell based on the cell selection procedure;
configure a periodic search timer based on a periodicity of the periodic uplink transmission;
perform the periodic uplink transmission on the NB-IoT cell;
entering to an any cell selection state upon expiry of the periodic search timer;
performing a cell reselection procedure, while in the any cell selection state; transmission; and
camping on another cell based on the cell reselection procedure; and
continuing the periodic uplink transmission on the another cell,
wherein (1) the periodic search timer has an interval time of N times of the periodic uplink transmission and (2) N is a natural number,
wherein the periodic search timer starts a duration for prohibiting cell selection before one transmission of the periodic uplink transmission is performed.