APPARATUS AND METHOD FOR CANCELLING INTER-CELL INTERFERENCE IN COMMUNICATION SYSTEM

• US 20150124691A1
• Filed: 10/31/2014
• Published: 05/07/2015
• Est. Priority Date: 11/01/2013
• Status: Active Grant

• Current Assignee: Ueran Technology LLC
• Original Assignee: Innovative Tech Lab Company Limited
• Inventors: LI, Jianjun
• Granted Patent: US 9,584,293 B2
• Time in Patent Office: Days
• US Class Current: 370/312
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/0854 using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/322 Power control of broadcast channels
• CPC Class Codes: H04W 72/30 Resource management for broadcast services

Abstract

The present disclosure relates to an apparatus and method for canceling and/or suppressing inter-cell interference in a wireless communication. The method includes: establishing a Radio Resource Control (RRC) connection with a base station through a first serving cell; receiving, at a User Equipment (UE), an RRC message through the first serving cell, the RRC message comprising cell-specific reference signal (CRS) information of a neighbor cell and Physical Downlink Shared Channel (PDSCH) information of the neighbor cell, and the PDSCH information of the neighbor cell comprising a parameter relating to a power ratio of a CRS of the neighbor cell and a PDSCH of the neighbor cell; receiving the PDSCH through the first serving cell; performing a channel estimation for retrieving data from a PDSCH of the first serving cell; and retrieving the data from the PDSCH of the first serving cell based on the second channel estimation.

Claims

1. A method of performing a wireless communication in an inter-cell interference environment, the method comprising:

establishing a Radio Resource Control (RRC) connection with a base station through a first serving cell;

receiving, at a User Equipment (UE), an RRC message through the first serving cell, the RRC message comprising cell-specific reference signal (CRS) information of a neighbor cell and Physical Downlink Shared Channel (PDSCH) information of the neighbor cell, and the PDSCH information of the neighbor cell comprising a parameter relating to a power ratio of a CRS of the neighbor cell and a PDSCH of the neighbor cell;

receiving the PDSCH through the first serving cell;

performing a channel estimation for retrieving data from a PDSCH of the first serving cell, the channel estimation comprising;

performing a first channel estimation for the PDSCH of the first serving cell based on a CRS of the first serving cell,

based on interference information of the CRS of the neighbor cell, canceling an interference of the CRS of the neighbor cell from the first channel estimation, and

based on the parameter relating to the power ratio of the CRS of the neighbor cell and the PDSCH of the neighbor cell, performing a second channel estimation for the PDSCH of the first serving cell by canceling an interference of the PDSCH of the neighbor cell; and

retrieving the data from the PDSCH of the first serving cell based on the second channel estimation.

2. The method of claim 1, further comprising:

transmitting first capability information to the base station through the first serving cell, the capability information indicating that the UE is capable of receiving network assisted interference cancelation and suppression (NAICS) information,

wherein the NAICS information is used by the UE to cancel and/or to suppress at least one of an intra-cell interference and an inter-cell interference.

3. The method of claim 2, wherein the first capability information is included in UE capability information of the UE.

4. The method of claim 1, wherein the CRS information of the neighbor cell comprises a scrambling code identification for the neighbor cell, the number of CRS ports of the neighbor cell, and a configuration of Multicast-Broadcast Single Frequency Network (MBSFN) subframe, and

the PDSCH information of the neighbor cell comprises a first power parameter (p-a) and a second power parameter (p-b).

5. The method of claim 4, wherein the RRC message comprises a NAICS_Config message, the NAICS_Config message comprising a CRS-AssistanecInfo field having the CRS information of the neighbor cell and a PDSCH-AssistanceInfo field having the PDSCH information of the neighbor cell,

wherein the PDSCH-AssistanceInfo field comprises a field for the first power parameter (p-a) and a field for the second power parameter (p-b), and

wherein the field for the second power parameter (p-b) comprises at least one of 0, 1, 2, and 3, and the field for the first power parameter (p-a) comprises at least one of dB-6, dB-4dot77, dB-3, dB-1dot77, dB0, dB1, dB2, and dB3.

6. The method of claim 1, wherein the PDSCH information of the neighbor cell comprises probability information of a modulation scheme for the PDSCH of the neighbor cell, and

the probability information comprises probability information for a first modulation scheme and probability information of a second modulation scheme.

7. The method of claim 1, wherein the RRC message comprises CRS information of the first serving cell and PDSCH information of the first serving cell, and

the PDSCH information of the first serving cell comprises a parameter relating to a power ratio of a CRS of the first serving cell and a PDSCH of the first serving cell.

8. The method of claim 7, wherein the CRS information of the first serving cell comprises a scrambling code identification of the first serving cell, the number of CRS ports for the first serving cell, and configuration of Multicast-Broadcast Single Frequency Network (MBSFN) subframe, and

wherein the PDSCH information of the first serving cell comprises a first power parameter (p-a) relating to the first serving cell and a second power parameter (p-b) relating to the first serving cell.

9. The method of claim 8, wherein a field for the second power parameter (p-b) relating to the first serving cell comprises at least one of 0, 1, 2, and 3, and a field for the first power parameter (p-a) relating to the first serving cell comprises at least one of dB-6, dB-4dot77, dB-3, dB-1dot77, dB0, dB1, dB2, and dB3.

10. The method of claim 1, wherein the RRC message further comprises interference information of an enhanced Physical Downlink Control Channel (ePDCCH) of the neighbor cell, and

wherein the interference information of the ePDCCH of the neighbor cell comprises an ePDCCH region of the neighbor cell, a parameter relating to a power ratio of the CRS of the neighbor cell and the ePDCCH of the neighbor cell, and probability information of quadrature phase shift keying (QPSK) used for the ePDCCH.

11. A method of performing a wireless communication in an inter-cell interference environment, the method comprising:

establishing a Radio Resource Control (RRC) connection with a User Equipment (UE) through a first serving cell;

transmitting, to the UE, an RRC message through the first serving cell, the RRC message comprising cell-specific reference signal (CRS) information of a neighbor cell and Physical Downlink Shared Channel (PDSCH) information of the neighbor cell, and the PDSCH information of the neighbor cell comprising a parameter relating to a power ratio of a CRS of the neighbor cell and a PDSCH of the neighbor cell; and

transmitting the PDSCH through the first serving cell,

wherein the parameter relating to the power ratio of the CRS of the neighbor cell and the PDSCH of the neighbor cell is configured for the UE to cancel an interference of the PDSCH of the neighbor cell in retrieving data from the PDSCH of the first serving cell.

12. The method of claim 11, further comprising:

receiving first capability information from the UE through the first serving cell, the capability information indicating that the UE is capable of receiving network assisted interference cancelation and suppression (NAICS) information; and

transmitting the NAICS information for the UE to cancel and/or to suppress at least one of an intra-cell interference and an inter-cell interference.

13. The method of claim 12, wherein the first capability information is included in UE capability information of the UE.

14. The method of claim 11, wherein the CRS information of the neighbor cell comprises a scrambling code identification for the neighbor cell, the number of CRS ports of the neighbor cell, and a configuration of Multicast-Broadcast Single Frequency Network (MBSFN) subframe, and

the PDSCH information of the neighbor cell comprises a first power parameter (p-a) and a second power parameter (p-b).

15. The method of claim 14, wherein the RRC message comprises a NAICS_Config message, the NAICS_Config message comprising a CRS-AssistanecInfo field having the CRS information of the neighbor cell and a PDSCH-AssistanceInfo field having the PDSCH information of the neighbor cell,

wherein the PDSCH-AssistanceInfo field comprises a field for the first power parameter (p-a) and a field for the second power parameter (p-b), and

wherein the field for the second power parameter (p-b) comprises at least one of 0, 1, 2, and 3, and the field for the first power parameter (p-a) comprises at least one of dB-6, dB-4dot77, dB-3, dB-1dot77, dB0, dB1, dB2, and dB3.

16. The method of claim 11, wherein the PDSCH information of the neighbor cell comprises probability information of a modulation scheme for the PDSCH of the neighbor cell, and

the probability information comprises probability information for a first modulation scheme and probability information of a second modulation scheme.

17. The method of claim 11, wherein the RRC message comprises CRS information of the first serving cell and PDSCH information of the first serving cell, and

the PDSCH information of the first serving cell comprises a parameter relating to a power ratio of a CRS of the first serving cell and a PDSCH of the first serving cell.

18. The method of claim 17, wherein the CRS information of the first serving cell comprises a scrambling code identification of the first serving cell, the number of CRS ports for the first serving cell, and configuration of Multicast-Broadcast Single Frequency Network (MBSFN) subframe, and

wherein the PDSCH information of the first serving cell comprises a first power parameter (p-a) relating to the first serving cell and a second power parameter (p-b) relating to the first serving cell.

19. The method of claim 18, wherein a field for the second power parameter (p-b) relating to the first serving cell comprises at least one of 0, 1, 2, and 3, and a field for the first power parameter (p-a) relating to the first serving cell comprises at least one of dB-6, dB-4dot77, dB-3, dB-1dot77, dB0, dB1, dB2, and dB3.

20. The method of claim 11, wherein the RRC message further comprises interference information of an enhanced Physical Downlink Control Channel (ePDCCH) of the neighbor cell, and

wherein the interference information of the ePDCCH of the neighbor cell comprises an ePDCCH region of the neighbor cell, a parameter relating to a power ratio of the CRS of the neighbor cell and the ePDCCH of the neighbor cell, and probability information of quadrature phase shift keying (QPSK) used for the ePDCCH.