# US 2019/0246390 A1 · Device and Method of Handling Narrowband Internet of Things Communication

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- Number: US 2019/0246390 A1
- Document ID: US20190246390A1
- Status: Published application
- Kind: A1
- Application number: 16/384,955
- Filed: 2019-04-16
- Published: 2019-08-08
- Earliest claimed: 2016-08-09
- Assignees: HTC Corporation
- Applicants: HTC Corporation
- Inventors: Chih-Hsiang Wu
- Web page: https://patentgrep.com/patent/US20190246390A1

## CPC

- H04W 72/51: based on terminal or device properties
- H04L 67/12: specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
- H04W 48/10: using broadcasted information
- H04W 48/12: using downlink control channel
- H04W 76/19: Connection re-establishment
- H04W 36/142: {over the same radio air interface technology}
- H04W 56/001: {Synchronization between nodes}
- 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 communication device for handling a narrowband internet of things (NB-IoT) communication comprises a storage device for storing instructions and a processing circuit coupled to the storage device. The processing circuit is configured to execute the instructions stored in the storage device. The instructions comprise initiating a radio resource control (RRC) connection reestablishment procedure for a NB-IoT communication; selecting a NB-IoT cell, when initiating the RRC connection reestablishment procedure; receiving a SystemInformationBlockType2-NB message broadcasted by the NB-IoT cell; and using a timeAlignmentTimerCommon comprised in the SystemInformationBlockType2-NB for an uplink (UL) transmission.

## Claims

### Claim 1

A communication device for handling a narrowband internet of things (NB-IoT) communication, comprising:
a storage device, for storing instructions of:
initiating a radio resource control (RRC) connection reestablishment procedure for a NB-IoT communication;
selecting a NB-IoT cell, when initiating the RRC connection reestablishment procedure;
receiving a SystemInformationBlockType2-NB message broadcasted by the NB-IoT cell; and
using a timeAlignmentTimerCommon comprised in the SystemInformationBlockType2-NB for an uplink (UL) transmission; and
a processing circuit, coupled to the storage device, configured to execute the instructions stored in the storage device.

### Claim 2 (depends on 1)

The communication device of claim 1, wherein the instruction of using the timeAlignmentTimerCommon comprises:
starting a time alignment timer according to a value in the timeAlignmentTimerCommon, when applying a timing advance command received from the NB-IoT cell.

### Claim 3 (depends on 2)

The communication device of claim 2, wherein the storage device further stores the instructions of:
transmitting a random access preamble to the NB-IoT cell;
receiving a random access response comprising the timing advance command from the NB-IoT cell, in response to the transmission of the random access preamble; and
transmitting a RRCConnectionReestablishmentRequest-NB, after receiving the random access response.

### Claim 4 (depends on 2)

The communication device of claim 2, wherein the instruction of using the timeAlignmentTimerCommon comprises:
receiving a Medium Access Control (MAC) Protocol Data Unit (PDU) comprising the timing advance command from the NB-IoT cell, after performing the RRC connection reestablishment procedure with the NB-IoT cell.

### Claim 5

A method for a communication device for handling a narrowband internet of things (NB-IoT) communication, comprising:
initiating a radio resource control (RRC) connection reestablishment procedure for a NB-IoT communication;
selecting a NB-IoT cell, when initiating the RRC connection reestablishment procedure;
receiving a SystemInformationBlockType2-NB message broadcasted by the NB-IoT cell; and
using a timeAlignmentTimerCommon comprised in the SystemInformationBlockType2-NB for an uplink (UL) transmission.

### Claim 6 (depends on 5)

The method of claim 5, wherein the method further comprises:
starting a time alignment timer according to a value in the timeAlignmentTimerCommon, when applying a timing advance command received from the NB-IoT cell.

### Claim 7 (depends on 6)

The method of claim 6, wherein the method further comprises:
transmitting a random access preamble to the NB-IoT cell;
receiving a random access response comprising the timing advance command from the NB-IoT cell, in response to the transmission of the random access preamble; and
transmitting a RRCConnectionReestablishmentRequest-NB, after receiving the random access response.

### Claim 8 (depends on 6)

The method of claim 6, wherein the method further comprises:
receiving a Medium Access Control (MAC) Protocol Data Unit (PDU) comprising the timing advance command from the NB-IoT cell, after performing the RRC connection reestablishment procedure with the NB-IoT cell.