METHOD FOR CHANGING PATTERN OF REFERENCE SIGNALS ACCORDING TO MOVEMENT SPEED OF USER EQUIPMENT IN WIRELESS COMMUNICATION SYSTEM, AND AN APPARATUS THEREFOR

• US 20160205677A1
• Filed: 10/10/2013
• Published: 07/14/2016
• Est. Priority Date: 12/04/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Kitae, KIM, Jinmin, KO, Hyunsoo, CHUNG, Jaehoon
• Granted Patent: US 9,699,791 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0069 Allocation based on distance or geographical location allocation based on terminal or device properties in general, H04W72/51
• CPC Class Codes: H04W 72/51 based on terminal or device properties

Abstract

A method for transmitting a reference signal by a base station to a user equipment in a wireless communication system is disclosed. The method includes transmitting the reference signal to the user equipment according to a first pattern corresponding to a first speed section, and if movement speed of the user equipment is changed to a second speed section from the first speed section, transmitting the reference signal to the user equipment according to a second pattern corresponding to the second speed section, wherein, if the second speed section is a higher-speed section than the first speed section, the second pattern includes the first pattern.

Claims

1. A method for transmitting a reference signal to a user equipment at a base station in a wireless communication system, comprising:

transmitting the reference signal to the user equipment according to a first pattern corresponding to a first speed section; and

if movement speed of the user equipment is changed to a second speed section from the first speed section, transmitting the reference signal to the user equipment according to a second pattern corresponding to the second speed section,

wherein, if the second speed section is a higher-speed section than the first speed section, the second pattern includes the first pattern.

2. The method according to claim 1, further comprising receiving information about the movement speed of the user equipment from the user equipment.

3. The method according to claim 2, wherein the information about the movement speed of the user equipment includes at least one of a movement speed value, a quantized movement speed level, a Doppler frequency corresponding to the movement speed, and a value normalizing the Doppler frequency using a subcarrier spacing.

4. The method according to claim 1, further comprising receiving information about the second pattern from the user equipment, when the movement speed of the user equipment is changed to the second speed section from the first speed section.

5. The method according to claim 1, wherein the second pattern is defined as a hierarchical structure in which one or more reference signal symbols are added to the first pattern in a time domain direction.

6. The method according to claim 1, wherein time-domain reference signal density of the second pattern is higher than time-domain reference signal density of the first pattern.

7. A method for receiving a reference signal from a base station at a user equipment in a wireless communication system, comprising:

receiving the reference signal from the base station according to a first pattern corresponding to a first speed section; and

if movement speed of the user equipment is changed to a second speed section from the first speed section, receiving the reference signal from the base station according to a second pattern corresponding to the second speed section,

wherein, if the second speed section is a higher-speed section than the first speed section, the second pattern includes the first pattern.

8. The method according to claim 7, further comprising:

estimating movement speed of the user equipment; and

transmitting information about the movement speed to the base station.

9. The method according to claim 8, wherein the information about the movement speed includes at least one of a movement speed value, a quantized movement speed level, a Doppler frequency corresponding to the movement speed, and a value normalizing the Doppler frequency using a subcarrier spacing.

10. The method according to claim 7, further comprising:

estimating movement speed of the user equipment; and

transmitting information about the second pattern to the base station, if the movement speed is changed to the second speed section from the first speed section.

11. The method according to claim 7, wherein the second pattern is defined as a hierarchical structure in which one or more reference signal symbols are added to the first pattern in a time domain direction.

12. The method according to claim 7, wherein time-domain reference signal density of the second pattern is higher than time-domain reference signal density of the first pattern.

13. A base station in a wireless communication system, comprising:

a radio communication module for transmitting and receiving signals to and from a user equipment; and

a processor for processing the signals,

wherein, while transmitting a reference signal to the user equipment according to a first pattern corresponding to a first speed section, if movement speed of the user equipment is changed to a second speed section from the first speed section, the processor controls the radio communication module to transmit the reference signal to the user equipment according to a second pattern corresponding to the second speed section, and

wherein, if the second speed section is a higher-speed section than the first speed section, the second pattern includes the first pattern.

14. A user equipment in a wireless communication system, comprising:

a radio communication module for transmitting and receiving signals to and from a base station; and

a processor for processing the signals,

wherein, while receiving a reference signal from the base station according to a first pattern corresponding to a first speed section, if movement speed of the user equipment is changed to a second speed section from the first speed section, the processor controls the radio communication module to receive the reference signal from the base station according to a second pattern corresponding to the second speed section, and

wherein, if the second speed section is a higher-speed section than the first speed section, the second pattern includes the first pattern.