METHOD AND USER EQUIPMENT FOR TRANSMITTING UPLINK SIGNAL

• US 20160057784A1
• Filed: 03/05/2014
• Published: 02/25/2016
• Est. Priority Date: 04/11/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: YOU, Hyangsun, YI, Yunjung, YANG, Suckchel
• Granted Patent: US 9,730,250 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The present invention provides a method and user equipment for transmitting an uplink signal capable of enhancing coverage while conserving energy by separating a cell for receiving a downlink from a cell for transmitting an uplink.

Claims

1. A method for transmitting an uplink signal by a user equipment, the method comprising:

receiving configuration information indicating a plurality of frequencies for uplink through a downlink operating frequency of a first cell;

performing a physical random access channel (PRACH) transmission on at least one frequency among the plurality of frequencies;

receiving frequency information indicating an uplink operating frequency for the uplink signal in response to the PRACH transmission; and

transmitting the uplink signal through the uplink operating frequency based on the frequency information.

2. The method according to claim 1,

wherein the uplink operating frequency is an uplink operating frequency of a second cell different from an uplink operating frequency of the first cell.

3. The method according to claim 2,

wherein the second cell is a small cell having coverage less than a predetermined reference value.

4. The method according to claim 2, further comprising:

receiving a timing advance (TA) value for the PRACH transmission through a downlink operating frequency of the second cell, wherein the TA value is ‘

0’

.

5. A user equipment for transmitting an uplink signal, the user equipment comprising:

a radio frequency (RF) unit and a processor configured to control the RF unit,

wherein the processor controls the RF unit to receive configuration information indicating a plurality of frequencies for uplink through a downlink operating frequency of a first cell;

controls the RF unit to perform a physical random access channel (PRACH) transmission on at least one frequency among the plurality of frequencies;

controls the RF unit to receive frequency information indicating an uplink operating frequency for the uplink signal in response to the PRACH transmission; and

controls the RF unit to transmit the uplink signal through the uplink operating frequency based on the frequency information.

6. The user equipment according to claim 5,

wherein the uplink operating frequency is an uplink operating frequency of a second cell different from an uplink operating frequency of the first cell.

7. The user equipment according to claim 6,

wherein the second cell is a small cell having coverage less than a predetermined reference value.

8. The user equipment according to claim 6,

wherein the processor controls the RF unit to further receive a timing advance (TA) value for the PRACH transmission through a downlink operating frequency of the second cell and wherein the TA value is ‘

0’

.