Interference-removed reception method and terminal

• US 9,729,264 B2
• Filed: 01/15/2014
• Issued: 08/08/2017
• Est. Priority Date: 01/18/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Jung, Manyoung, Lee, Sangwook, Hwang, Jinyup, Yang, Yoonoh, Lim, Suhwan
• Primary Examiner(s): Crutchfield, Christopher
• Application Number:
  US14/761,232
• Publication Number:
  US 20150358100A1
• Time in Patent Office: 1,301 Days
• CPC Class Codes: H04B 1/7107 Subtractive interference cancellation
• CPC Class Codes: H04J 11/005 of intercell interference
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/0048 in conjunction with detection of multiuser or interfering signals, e.g. iteration between CDMA or MIMO detector and FEC decoder for spatial equalizer H04L25/03286
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 27/2636 with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• 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 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

One embodiment of the present specification provides an interference-removed reception method. The interference-removed reception method may comprise the steps of: encoding, in a binary in a physical channel, stored information for an attacker cell which causes interference; performing a comparison between the encoded binary and a new binary in the physical channel received from the attacker cell; and if the binaries match, removing interference caused by the new binary in the physical channel received from the attacker cell by using the encoded binary, and thereby receiving a signal from a serving cell.

Claims

1. An interference-removed reception method performed by a terminal, the method comprising:

encoding previously stored information into a binary for a physical channel of an aggressor cell,

wherein the previously stored information was included in the physical channel previously received from the aggressor cell and which caused interference to signals from a serving cell,

wherein the encoding of the previously stored information comprises;

periodically updating a part included in the previously stored information, and

periodically encoding the information including the updated part into the first binary by using a tail-biting convolutional code (TBCC);

receiving a signal from the serving cell,

wherein the physical channel newly received from the aggressor cell interferes with the signal;

using the TBCC to generate a second binary for the physical channel newly received from the aggressor cell;

comparing the first binary and the second binary; and

if the first and second binaries match, removing interference from the signal of the serving cell caused by the physical channel newly received from the aggressor cell.

2. The method of claim 1,

wherein the previously stored information is system information of the aggressor cell, and

wherein the physical channel is a physical broadcast channel (PBCH).

3. The method of claim 2, wherein the system information is a master information block (MIB).

4. The method of claim 1, wherein the information is previously stored by:

acquiring the information by decoding the physical channel from the aggressor cell; and

storing the acquired information.

5. The method of claim 2,

wherein the part of information is a system frame number (SFN) in the system information of the aggressor cell, and

wherein the updating is performed in accordance with an operation in which the SFN is updated every 40 ms.

6. The method of claim 1, wherein the comparison between the first binary and the second binary comprises a comparison between a cyclic redundancy check (CRC) part of the first binary and a CRC part of the second binary.

7. The method of claim 1, further comprising:

if the first binary and the second binary do not match, decoding the second binary for the physical channel newly received from the aggressor cell;

determining whether a cyclic redundancy check (CRC) part of the first binary and a CRC part of the second binary match each other; and

if the CRC part of the first binary and the CRC part of the second binary match each other, the removing interference comprises removing interference corresponding to the second binary based on the first binary.

8. The method of claim 7, further comprising:

before determining whether the CRC part of the first binary and the CRC part of the second binary match, determining whether there is a CRC error as a result of the decoding.

9. The method of claim 7, further comprising:

if the CRC part of the first binary and the CRC part of the second binary do not match each other, storing information obtained from the decoding;

encoding the stored information obtained from the decoding into a third binary for the physical channel; and

removing the interference by removing interference corresponding to the second binary based on the first binary.

10. An interference-removed reception terminal comprising:

a radio frequency (RF) unit; and

a processor controlling the RF unit, the processor configured to;

encode previously stored information into a binary for a physical channel of an aggressor cell,

wherein the previously stored information was included in the physical channel previously received from the aggressor cell and which caused interference to signals from a serving cell,

wherein the processor encodes the previously stored information by;

periodically updating a part included in the previously stored information, and

periodically encoding the information including the updated part into the first binary by using a tail-biting convolutional code (TBCC);

receiving a signal from the serving cell,

wherein the physical channel newly received from the aggressor cell interferes with the signal;

use the TBCC to generate a second binary for the physical channel newly received from the aggressor cell;

compare the first binary and the second binary; and

if the first and second binaries match, remove interference from the signal of the serving cell caused by the physical channel newly received from the aggressor cell.

11. The terminal of claim 10,

wherein the previously stored information is system information of the aggressor cell, and

wherein the physical channel is a physical broadcast channel (PBCH).

12. The terminal of claim 11, wherein the system information is a master information block (MIB).

13. The terminal of claim 11,

wherein the part of information is a system frame number (SFN) in the system information of the aggressor cell, and

wherein the updating is performed in accordance with an operation in which the SFN is updated every 40 ms.