Apparatus and method for cancelling inter-cell interference in communication system

Patent metadata

Field	Value
Publication number	US-10158476-B2
Application number	US-201715714038-A
Country	US
Kind code	B2
Filing date	Sep 25, 2017
Priority date	Nov 1, 2013
Publication date	Dec 18, 2018
Grant date	Dec 18, 2018

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.

First claim

What is claimed is:

1. A method of performing a wireless communication in an inter-cell interference environment, the method comprising:
receiving, by a User Equipment (UE), a Radio Resource Control (RRC) message via a 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;
determining the parameter based on the RRC message;
receiving, by the UE, a PDSCH of the serving cell; and
determining, based on a CRS of the serving cell and based on the parameter, data from the PDSCH of the serving cell,
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.

2. The method of claim 1 , wherein the determining the data from the PDSCH of the serving cell comprises:
performing a first channel estimation for the PDSCH of the serving cell based on the CRS of the 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, performing a second channel estimation for the PDSCH of the serving cell by canceling an interference of the PDSCH of the neighbor cell.

3. The method of claim 1 , wherein
the PDSCH information of the neighbor cell comprises a first power parameter (p-a) and a second power parameter (p-b).

4. The method of claim 3 , wherein a 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.

5. 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.

6. The method of claim 1 , wherein the RRC message comprises CRS information of the serving cell and PDSCH information of the serving cell, and
the PDSCH information of the serving cell comprises a parameter relating to a power ratio of the CRS of the serving cell and the PDSCH of the serving cell.

7. The method of claim 6 , wherein the CRS information of the serving cell comprises a scrambling code identification of the serving cell, the number of CRS ports for the serving cell, and configuration of Multicast-Broadcast Single Frequency Network (MBSFN) subframe, and
wherein the PDSCH information of the serving cell comprises a first power parameter (p-a) relating to the serving cell and a second power parameter (p-b) relating to the serving cell.

8. The method of claim 7 , wherein a field for the second power parameter (p-b) relating to the 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 serving cell comprises at least one of dB-6, dB-4dot77, dB-3, dB-1dot77, dB0, dB1, dB2, and dB3.

9. A method of performing a wireless communication in an inter-cell interference environment, the method comprising:
determining, for a User Equipment (UE), a parameter relating to a power ratio of a cell-specific reference signal (CRS) of a neighbor cell and a Physical Downlink Shared Channel (PDSCH) of the neighbor cell;
transmitting, to the UE and via a serving cell, a Radio Resource Control (RRC) message, the RRC message comprising CRS information of the neighbor cell and PDSCH information of the neighbor cell, and the PDSCH information of the neighbor cell comprising the parameter; and
transmitting, to the UE, a CRS of the serving cell and a PDSCH of the serving cell,
wherein the CRS of the serving cell is configured for the UE to estimate a channel associated with the PDSCH of the 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 serving cell,
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.

10. The method of claim 9 , further comprising:
transmitting, to the UE and via the serving cell, a parameter relating to a power ratio of the CRS of the serving cell and the PDSCH of the serving cell.

11. The method of claim 9 ,
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).

12. The method of claim 11 , further comprising transmitting a NAICS_Config message comprising a PDSCH-AssistanceInfo field, 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.

13. 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.

14. The method of claim 9 , further comprising transmitting, to the UE and via the serving cell, CRS information of the serving cell and PDSCH information of the serving cell,
wherein the CRS information of the serving cell comprises a scrambling code identification of the serving cell, the number of CRS ports for the serving cell, and configuration of Multicast-Broadcast Single Frequency Network (MBSFN) subframe, and
wherein the PDSCH information of the serving cell comprises a first power parameter (p-a) relating to the serving cell and a second power parameter (p-b) relating to the serving cell.

15. The method of claim 14 , wherein a field for the second power parameter (p-b) relating to the 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 serving cell comprises at least one of dB-6, dB-4dot77, dB-3, dB-1dot77, dB0, dB1

Assignees

• Innovative Tech Lab Co Ltd
• Huawei Tech Co Ltd

Inventors

• Li Jianjun

Classifications

• H04W72/30

  Resource management for broadcast services · CPC title

• H04W52/243

  taking into account interferences · CPC title

• H04L5/0023

  Time-frequency-space · CPC title

• H04W52/322

  Power control of broadcast channels · CPC title

• H04L5/0035

  Resource allocation in a cooperative multipoint environment · CPC title