Method and apparatus for monitoring control channel

• US 9,609,675 B2
• Filed: 01/16/2013
• Issued: 03/28/2017
• Est. Priority Date: 01/16/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Hak Seong, Seo, Han Byul
• Primary Examiner(s): Rutkowski, Jeffrey M
• Assistant Examiner(s): Wood, Jonathan B
• Application Number:
  US14/372,315
• Publication Number:
  US 20140376395A1
• Time in Patent Office: 1,532 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2627 Modulators
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/1469 using time-sharing
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/11 Allocation or use of connection identifiers

Abstract

Provided are a method and an apparatus for monitoring a control channel in a sub-frame including a plurality of orthogonal frequency division multiplexings (OFDMs) in a time division duplex (TDD)-based wireless communication system. A wireless device monitors a downlink control channel in at least one OFDM symbol after an OFDM symbol receives a primary synchronization signal (PSS) in the sub-frame.

Claims

1. A method for monitoring an enhanced physical downlink control channel (EPDCCH) in a subframe including a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time division duplex (TDD)-based wireless communication system, the method comprising:

receiving a primary synchronization signal (PSS) in 6 resource blocks (RBs) and on a 3^rd OFDM symbol of the subframe;

monitoring, by a wireless device, the EPDCCH in the 6 RBs and on at least one OFDM symbol located after the 3^rd OFDM symbol where the PSS is received; and

receiving a demodulation reference signal (DMRS) to demodulate the EPDCCH,

wherein when the DMRS is received in the 6 RBs and on the subframe where the PSS is received and when the subframe corresponds to a TDD-based special subframe, a location of the DMRS is changed from a 3^rd to a 6^th symbol and from a 4^th to a 7^th symbol.

2. The method of claim 1, wherein the subframe is a 7^th subframe in a radio frame including 10 subframes.

3. A wireless device for monitoring an enhanced physical downlink control channel (EPDCCH) in a subframe including a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time division duplex (TDD)-based wireless communication system, the wireless device comprising:

a radio frequency (RF) unit configured to transmit and receive a radio signal;

and a processor operatively coupled to the RF unit and configured to;

receive a primary synchronization signal (PSS) in 6 resource blocks (RBs) and on a 3^rd OFDM symbol of the subframe;

monitor the EPDCCH in the 6 RBs and on at least one OFDM symbol located after the 3^rd OFDM symbol where the PSS is received, and

receive a demodulation reference signal (DMRS) to demodulate the EPDCCH,

wherein when the DMRS is received in the 6 RBs and on the subframe where the PSS is received and when the subframe corresponds to a TDD-based special subframe, a location of the DMRS is changed from a 3^rd to a 6^th symbol and from a 4^th to a 7^th symbol.