METHOD FOR RECEIVING SYSTEM INFORMATION IN WIRELESS COMMUNICATION SYSTEM THAT SUPPORTS NARROWBAND IOT AND APPARATUS FOR THE SAME

• US 20170251455A1
• Filed: 02/23/2017
• Published: 08/31/2017
• Est. Priority Date: 02/26/2016
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: SHIN, Seokmin, KO, Hyunsoo, YI, Yunjung
• Granted Patent: US 10,420,087 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 5/00 Arrangements affording multiple use of the transmission path
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: 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
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A method for receiving downlink data in a wireless communication system supporting a Narrow Band (NB)-Internet of Things (IoT), the method performed by a terminal comprising: receiving a narrowband synchronization signal (NBSS) on a first NB-IoT carrier from a base station; acquiring, based on the NBSS, time synchronization and frequency synchronization with the base station; receiving the system information related to the NB-IoT on the first NB-IoT carrier from the base station; being assigned a second NB-IoT carrier from the base station; and receiving the downlink data on at least one of the first NB-IoT carrier or the second NB-IoT carrier from the base station.

Claims

1. A method for receiving downlink data in a wireless communication system supporting a Narrow Band (NB)-Internet of Things (IoT), the method performed by a terminal comprising:

receiving a narrowband synchronization signal (NBSS) on a first NB-IoT carrier from a base station;

acquiring, based on the NBSS, time synchronization and frequency synchronization with the base station;

receiving the system information related to the NB-IoT on the first NB-IoT carrier from the base station;

being assigned a second NB-IoT carrier from the base station; and

receiving the downlink data on at least one of the first NB-IoT carrier or the second NB-IoT carrier from the base station.

2. The method of claim 1, wherein the being assigned the second NB-IoT carrier from the base station comprising:

receiving information for the second NB-IoT carrier through a high layer signaling from the base station.

3. The method of claim 2, wherein the information for the second NB-IoT carrier further includes control information related to a PRB (physical resource block) index of the second NB-IoT carrier.

4. The method of claim 3, wherein the control information is information indicating a frequency difference between a center frequency of the second NB-IoT carrier and a Direct Current (DC).

5. The method of claim 4, wherein the control information includes 100 state values.

6. The method of claim 4, wherein the information of the second NB-IoT carrier includes at least one of a first information indicating an operation mode of the second NB-IoT carrier or a second information indicating whether the second NB-IoT carrier has same Physical Cell ID (PCID) as a legacy carrier.

7. The method of claim 1, wherein the first NB-IoT carrier is an anchor PRB, and

wherein the second NB-IoT carrier is a configured PRB.

8. The method of claim 1, wherein the system information includes at least one of operation mode information that represents an operation mode of the NB-IoT system or a channel raster offset indicator that represents a channel raster offset.

9. The method of claim 1, wherein the narrowband synchronization signal includes a narrowband primary synchronization signal and a narrowband secondary synchronization signal.

10. The method of claim 1, wherein the narrowband is a system bandwidth that corresponds to 1 Physical Resource Block (PRB) of Long Term Evolution (LTE) system.

11. The method of claim 10, wherein the 1 PRB includes 12 subcarriers.

12. The method of claim 11, wherein the narrowband primary synchronization signal is received through 11 consecutive subcarriers among the 12 subcarriers.

13. The method of claim 12, wherein the 11 consecutive subcarriers are configured by excluding a specific subcarrier among the 12 subcarriers.

14. The method of claim 13, wherein the specific subcarrier is a subcarrier with the lowest subcarrier index or the highest subcarrier index.

15. A terminal for receiving downlink data in a wireless communication system supporting a Narrow Band (NB)-Internet of Things (IoT), comprising:

a Radio Frequency (RF) unit for transmitting and receiving a radio signal; and

a processor for controlling the RF unit,

wherein the processor is configured to perform;

receiving a narrowband synchronization signal (NBSS) on a first NB-IoT carrier from a base station;

acquiring, based on the NBSS, time synchronization and frequency synchronization with the base station;

receiving the system information related to the NB-IoT on the first NB-IoT carrier from the base station;

being assigned a second NB-IoT carrier from the base station; and

receiving the downlink data on at least one of the first NB-IoT carrier or the second NB-IoT carrier from the base station.