Method and apparatus for transmitting and receiving signal in high speed train communication network

Patent metadata

Field	Value
Publication number	US-10349448-B2
Application number	US-201715609748-A
Country	US
Kind code	B2
Filing date	May 31, 2017
Priority date	Jun 1, 2016
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

A method for transmitting and receiving a signal using steps of transmitting an uplink signal to a base station in a duration of an uplink pilot time slot (UpPTS) of a special subframe, and waiting for a guard time (GT) before receiving a downlink signal from the base station after the transmission of the uplink signal, and a terminal transmitting and receiving a signal by using the method.

First claim

What is claimed is:

1. A terminal of a mobile communication system, comprising:
a processor;
a memory; and
a radio frequency unit,
wherein the processor executes a program stored in the memory to perform steps of:
receiving a first downlink signal from a base station in a duration of a downlink pilot time slot (DwPTS) of a special subframe;
transmitting an uplink signal to the base station in a duration of an uplink pilot time slot (UpPTS) of the special subframe without a waiting time after receiving the first downlink signal; and
waiting for a guard time (GT) before receiving a second downlink signal from the base station after the transmission of the uplink signal.

2. The terminal of claim 1 , wherein the transmission of the downlink signal from the base station is performed by the base station prior to a round-trip transmission delay from a reception of the uplink signal of the base station.

3. The terminal of claim 1 , wherein when performing the transmitting of the uplink signal, the processor further performs transmitting the uplink signal to the base station in a duration of an uplink subframe.

4. The terminal of claim 3 , wherein a sum of the duration of the DwPTS, the duration of the UpPTS, the duration of the uplink subframe, and the guard time is same as a duration of 2 subframes of an LTE system.

5. The terminal of claim 1 , wherein the processor executes the program to further perform receiving a downlink signal from the base station in a duration of a downlink subframe after the waiting for the guard time.

6. A method for transmitting and receiving a signal of a terminal in a mobile communication system, comprising:
receiving a first downlink signal from a base station in a duration of a downlink pilot time slot (DwPTS) of a special subframe;
transmitting an uplink signal to the base station in a duration of an uplink pilot time slot (UpPTS) of the special subframe without a waiting time after receiving the first downlink signal; and
waiting for a guard time (GT) before receiving a second downlink signal from the base station after the transmission of the uplink signal.

7. The method of claim 6 , wherein the transmission of the downlink signal from the base station is performed by the base station prior to a round-trip transmission delay from reception of the uplink signal of the base station.

8. The method of claim 6 , wherein the transmitting of the uplink signal includes transmitting the uplink signal to the base station in a duration of the UpPTS of the special subframe and a duration of an uplink subframe.

9. The method of claim 8 , wherein a sum of the duration of the DwPTS, the duration of the UpPTS, the duration of the uplink subframe, and the guard time is same as a duration of 2 subframes of an LTE system.

10. The method of claim 6 , further comprising receiving a downlink signal from the base station in a duration of a downlink subframe after the waiting for the guard time.

11. A base station of a mobile communication system, comprising:
a processor;
a memory; and
a radio frequency unit,
wherein the processor executes a program stored in the memory to perform steps of:
estimating a transmission delay based on a special symbol included in a random access channel received from a terminal;
transmitting a downlink signal to the terminal in a duration of a downlink pilot time slot (DwPTS) of a special subframe;
waiting for a round-trip transmission delay determined based on the transmission delay before the base station receives an uplink signal from the terminal in a duration of an uplink pilot time slot (UpPTS) of the special subframe;
receiving the uplink signal from the terminal in the duration of the UpPTS of the special subframe; and
waiting for a duration determined by substracting the round-trip transmission delay from the guard time.

12. The base station of claim 11 , wherein the special symbol is located at one or more special symbol locations among n special symbol locations included in the random access channel.

13. The base station of claim 12 , wherein when the special symbol is located at two or more special symbol locations among the n special symbol locations, the two or more special symbol locations are consecutively located in the random access channel.

14. The base station of claim 11 , wherein a number of the special symbol location, a length of the special symbol location, and a number of the special symbol which is transmitted by the terminal is determined adaptively based on a system parameter and an environment.

15. The base station of claim 11 , wherein the guard time is same with a maximum round-trip transmission delay.

16. The base station of claim 11 , wherein the special symbol includes connection request information for a network access.

Assignees

• Electronics & Telecommunications Res Inst

Inventors

• Hui Bing
• Kim Junhyeong
• Kim Yeong Jin
• Kim Il Gyu
• Chung Hee Sang

Classifications

• H04W74/0833 Primary

  Random access procedures, e.g. with 4-step access · CPC title

• H04W56/00

  Synchronisation arrangements · CPC title

• H04W74/0838

  using contention-free random access [CFRA] · CPC title