Method for allocating pilots

• US 9,386,561 B2
• Filed: 05/16/2013
• Issued: 07/05/2016
• Est. Priority Date: 11/01/2006
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Noh, Min Seok, Han, Seung Hee, Kwon, Yeong Hyeon, Lee, Hyun Woo, Kim, Dong Cheol
• Primary Examiner(s): Phillips, Hassan
• Assistant Examiner(s): Wei, Siren
• Application Number:
  US13/896,196
• Publication Number:
  US 20130286969A1
• Time in Patent Office: 1,146 Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

This is provided a method for allocating pilots to a sub-frame. The sub-frame includes a plurality of blocks in time domain. The method includes allocating a data demodulation (DM) pilot used for demodulating data to two blocks spaced not contiguous with each other, and allocating a channel quality (CQ) pilot. System capacity can be increased, and degradation of performance incurred by a channel estimation error can be minimized.

Claims

1. A method for transmitting pilot signals in a wireless communication system supporting a single carrier frequency-division multiple access (SC-FDMA) scheme, the method performed by a user equipment (UE) and comprising:

transmitting, from the UE, a first pilot signal included in at least one first SC-FDMA symbol of a first subframe and at least one second SC-FDMA symbol of a second subframe following the first subframe, wherein each of the first subframe and the second subframe is transmitted within 0.5 ms, wherein a first frequency band used for the first pilot signal in the first subframe is different from a second frequency band used for the first pilot signal in the second subframe, wherein the first pilot signal is used for demodulating data; and

transmitting, from the UE, a second pilot signal used for measuring channel quality, wherein the second pilot signal is only included in the second subframe, and in a last SC-FDMA symbol of the second subframe, wherein a frequency band used for transmitting the second pilot signal is wider than a frequency band used for transmitting the first pilot signal in the first subframe or the second subframe.

2. The method of claim 1, wherein a width of the first frequency band is same as a width of the second frequency band.

3. A user equipment (UE) for transmitting pilot signals in a wireless communication system supporting a single carrier frequency-division multiple access (SC-FDMA) scheme, the UE comprising:

a memory coupled to a processor, the processor configured for;

transmitting, from the UE, a first pilot signal included in at least one first SC-FDMA symbol of a first subframe and at least one second SC-FDMA symbol of a second subframe following the first subframe, wherein each of the first subframe and the second subframe is transmitted within 0.5 ms, wherein a first frequency band used for the first pilot signal in the first subframe is different from a second frequency band used for the first pilot signal in the second subframe, wherein the first pilot signal is used for demodulating data; and

transmitting, from the UE, a second pilot signal used for measuring channel quality, wherein the second pilot signal is only included in the second subframe, and in a last SC-FDMA symbol of the second subframe, wherein a frequency band used for transmitting the second pilot signal is wider than a frequency band used for transmitting the first pilot signal in the first subframe or the second subframe.

4. The user equipment of claim 3, wherein a width of the first frequency band is same as a width of the second frequency band.