METHOD AND APPARATUS FOR BIT MAPPING FOR DOWNLINK CONTROL CHANNEL IN WIRELESS COMMUNICATION SYSTEM

• US 20140161087A1
• Filed: 07/18/2012
• Published: 06/12/2014
• Est. Priority Date: 07/24/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Chun, Jin Young, Kim, Ki Tae, Kim, Su Nam, Kang, Ji Won, Ihm, Bin Chul, Park, Sung Ho
• Granted Patent: US 9,407,408 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 27/0006 Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio for spectrum sharing between different networks H04W16/14
• 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 5/0046 Determination of how many bits are transmitted on different sub-channels
• 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: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A method and an apparatus for mapping a bit of an enhanced physical downlink control channel (e-PDCCH) in a wireless communication system are provided. A base station maps an e-PDCCH bit on a first region to which the e-PDCCH is allocated from a data region within a subframe, and maps a redundant bit of the e-PDCCH bit on a second region, which is between a control region and the first region within the subframe, including at least one orthogonal frequency division multiplexing symbol (OFDM). The e-PDCCH bit is mapped from a k^th OFDM symbol within the subframe in the direction of an increasing OFDM symbol index, and the redundant bit is mapped from a (k−1)^th OFDM symbol in the direction of a decreasing OFDM symbol index.

Claims

1. A method for mapping, by a base station, a bit of an enhanced physical downlink control channel (e-PDCCH) in a wireless communication system, the method comprising:

mapping an e-PDCCH bit to a first region to which an e-PDCCH is allocated in a data region within a subframe;

mapping a redundant bit of the e-PDCCH bit to a second region including at least one orthogonal frequency division multiplexing (OFDM) symbol between a control region and the first region within the subframe; and

transmitting the mapped e-PDCCH bit and the redundant bit to a user equipment,

wherein the e-PDCCH bit is mapped from a k^th OFDM symbol within the subframe in the direction of an increasing OFDM symbol index, and

wherein the redundant bit is mapped from a (k−

1)^th OFDM symbol within the subframe in the direction of a decreasing OFDM symbol index.

2. The method of claim 1, wherein the redundant bit is a part or the whole part of the e-PDCCH bit.

3. The method of claim 1, wherein the control region occupies first one to three numbers of the OFDM symbols within the subframe.

4. The method of claim 1, wherein k=4.

5. The method of claim 1, wherein the mapping the e-PDCCH bit comprises:

adding a scrambling sequence to the e-PDCCH bit,

generating modulation symbols by performing quadrature phase shift keying (QPSK) modulation on the e-PDCCH bit to which the scrambling sequence is added,

performing a layer mapping and precoding on the generated modulation symbols, and

mapping the modulation symbols to resource elements.

6. The method of claim 1, wherein the mapping the redundant bit comprises:

adding a scrambling sequence to the redundant bit,

generating modulations symbol by performing quadrature phase shift keying (QPSK) modulation on the e-PDCCH bit to which the scrambling sequence is added,

performing a layer mapping and precoding on the generated modulation symbols, and

mapping the modulation symbols to resource elements.

7. A method for decoding, by a user equipment, an enhanced physical downlink control channel (e-PDCCH) in a wireless communication system, the method comprising:

searching a first region to which an e-PDCCH is allocated in a data region within a subframe, and a second region including at least one orthogonal frequency division multiplexing (OFDM) symbol between a control region and the first region within the subframe; and

decoding an e-PDCCH bit and a redundant bit received from the first region and the second region,

wherein the e-PDCCH bit is mapped from a k^th OFDM symbol within the subframe in the direction of an increasing OFDM symbol index, and

wherein the redundant bit is mapped from a (k−

1)^th OFDM symbol within the subframe in the direction of a decreasing OFDM symbol index.

8. The method of claim 7, wherein the redundant bit is a part or the whole part of the e-PDCCH bit.

9. The method of claim 7, wherein the control region occupies first one to three numbers of the OFDM symbols within the subframe.

10. The method of claim 7, wherein k=4.

11. A base station for mapping a bit of an enhanced physical downlink control channel (e-PDCCH) in a wireless communication system, the base station comprising:

a radio frequency (RF) unit for transmitting or receiving a radio signal, and

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

map an e-PDCCH bit to a first region to which an e-PDCCH is allocated in a data region within a subframe;

map a redundant bit of the e-PDCCH bit to a second region including at least one orthogonal frequency division multiplexing (OFDM) symbol between a control region and the first region within the subframe; and

transmit the mapped e-PDCCH bit and the redundant bit to a user equipment,

wherein the e-PDCCH bit is mapped from a k^th OFDM symbol within the subframe in the direction of an increasing OFDM symbol index, and

wherein the redundant bit is mapped from a (k−

1)^th OFDM symbol within the subframe in the direction of a decreasing OFDM symbol index.

12. The base station of claim 11, wherein the redundant bit is a part or the whole part of the e-PDCCH bit.

13. The base station of claim 11, wherein the control region occupies first one to three numbers of the OFDM symbols within the subframe.