Method and apparatus for transmitting a random access preamble in a narrow band IoT system supporting time division duplexing

Patent metadata

Field	Value
Publication number	US-2019159248-A1
Application number	US-201816190952-A
Country	US
Kind code	A1
Filing date	Nov 14, 2018
Priority date	Nov 14, 2017
Publication date	May 23, 2019
Grant date	—

Abstract

Provided are a method for transmitting a random access preamble in a narrowband-IoT system supporting time division duplexing and an apparatus therefor.
Specifically, a method for transmitting a narrowband physical random access channel (NPRACH) preamble by a user equipment in a narrowband-Internet of things (NB-IoT) system supporting time division duplexing may include: receiving, from a base station, configuration information related to an uplink-downlink configuration; and transmitting, to the base station, the NPRACH preamble configured by considering the uplink-downlink configuration.

First claim

What is claimed is:

1 . A method for transmitting a narrowband physical random access channel (NPRACH) preamble by a user equipment in a narrowband-Internet of things (NB-IoT) system supporting time division duplexing, the method comprising:
receiving, from a base station, configuration information related to an uplink-downlink configuration; and transmitting, to the base station, the NPRACH preamble configured by considering the uplink-downlink configuration, wherein the NPRACH preamble includes two symbol group sets and the symbol group set includes three contiguous symbol groups, and wherein a length of the symbol group set is configured be shorter than a transmission time unit in the NB-IoT system.

2 . The method of claim 1 , wherein the symbol group includes one cyclic prefix and one symbol.

3 . The method of claim 2 , wherein the uplink-downlink configuration is configured based on frame structure type 2 related to the time division duplexing.

4 . The method of claim 3 , wherein the transmission time unit is a subframe based on the frame structure type 2.

5 . The method of claim 1 , wherein the three contiguous symbol groups are transmitted through first frequency hopping and second frequency hopping.

6 . The method of claim 5 , wherein a value of the second frequency hopping is six times the value of the first frequency hopping.

7 . The method of claim 2 , wherein the number of symbol group sets included in the NPRACH preamble, the number of symbol groups included in the symbol group set, and the number of symbols included in the symbol group are configured differently according to the uplink-downlink configuration supported by the base station.

8 . A method for receiving a narrowband physical random access channel (NPRACH) preamble by a base station in a narrowband-Internet of things (NB-IoT) system supporting time division duplexing, the method comprising:
transmitting, to a base station, configuration information related to an uplink-downlink configuration; and receiving, from the user equipment, the NPRACH preamble configured by considering the uplink-downlink configuration, wherein the NPRACH preamble includes two symbol group sets and the symbol group set includes three contiguous symbol groups, and wherein a length of the symbol group set is configured be shorter than a transmission time unit in the NB-IoT system.

9 . The method of claim 8 , wherein the symbol group includes one cyclic prefix and one symbol.

10 . The method of claim 9 , wherein the uplink-downlink configuration is configured based on frame structure type 2 related to the time division duplexing.

11 . The method of claim 10 , wherein the transmission time unit is a subframe based on the frame structure type 2.

12 . A user equipment transmitting a narrowband physical random access channel (NPRACH) preamble in a narrowband-Internet of things (NB-IoT) system supporting time division duplexing, the user equipment comprising:
a radio frequency (RF) module transmitting and receiving a radio signal; and a processor controlling the RF module, wherein the processor receives, from a base station, configuration information related to an uplink-downlink configuration, and transmits, to the base station, the NPRACH preamble configured by considering the uplink-downlink configuration, wherein the NPRACH preamble includes two symbol group sets and the symbol group set includes three contiguous symbol groups, and wherein a length of the symbol group set is configured be shorter than a transmission time unit in the NB-IoT system.

13 . The user equipment of claim 12 , wherein the symbol group includes one cyclic prefix and one symbol.

14 . The user equipment of claim 13 , wherein the uplink-downlink configuration is configured based on frame structure type 2 related to the time division duplexing.

15 . The user equipment of claim 14 , wherein the transmission time unit is a subframe based on the frame structure type 2.

Assignees

• Lg Electronics Inc

Inventors

• Shin Seokmin
• Park Changhwan
• Kim Seonwook
• Ahn Joonkui
• Yang Suckchel
• Hwang Seunggye

Classifications

• H04L27/2607

  Cyclic extensions · CPC title

• H04L27/2678

  using cyclostationarities, e.g. cyclic prefix or postfix · CPC title

• H04L2027/0095

  in a preamble or similar structure · CPC title

• H04L5/0012

  Hopping in multicarrier systems · CPC title

• H04L27/0014

  Carrier regulation (of chaotic carriers H04L27/001; for multicarrier receivers H04L27/2657) · CPC title