Method, apparatus, and system for handling co-channel cell interference

• US 10,523,401 B2
• Filed: 01/29/2016
• Issued: 12/31/2019
• Est. Priority Date: 07/30/2013
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Wu, Zuomin, Wu, Hai, Cheng, Xingqing, Zhang, Ningbo, Wang, Hao
• Primary Examiner(s): Mian, Omer S
• Application Number:
  US15/009,963
• Publication Number:
  US 20160150548A1
• Time in Patent Office: 1,432 Days
• CPC Class Codes: H04J 11/005 of intercell interference
• 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 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• 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: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

Embodiments provide a method, an apparatus, and a system for handling co-channel cell interference, a base station and a user terminal. The method includes obtaining interference information of a non-serving cell; and sending the obtained interference information of the non-serving cell to a user terminal UE. Co-channel interference caused in the non-serving cell to the UE can be well suppressed or cancelled, and performance of the UE in demodulating a PDSCH can be better improved.

Claims

1. A method, comprising:

receiving, by a user terminal, interference information of a non-serving cell, wherein the interference information comprises a generation parameter, physical resource block (PRB) bundling information of the non-serving cell, and pilot data power ratio information of the non-serving cell, and wherein the generation parameter is a physical cell identifier of the non-serving cell, the pilot data power ratio information of the non-serving cell comprises a public parameter (PB) of the non-serving cell and a number of antenna ports of cell-specific reference signals (CRSs) of the non-serving cell, and wherein the user terminal assumes, according to the PRB bundling information, PRBs that are applied with the same precoding;

and

suppressing, by the user terminal according to the received interference information, co-channel interference brought by a downlink transmission signal of the non-serving cell to a downlink transmission signal of a serving cell, wherein suppressing, by the user terminal, the co-channel interference brought by the downlink transmission signal of the non-serving cell to the downlink transmission signal of the serving cell comprises;

determining a user-terminal-specific reference signal sequence of the non-serving cell according to the received generation parameter;

performing channel estimation on a downlink transmission channel of the non-serving cell according to the determined user-terminal-specific reference signal sequence, wherein performing the channel estimation on the downlink transmission channel of the non-serving cell according to the determined user-terminal-specific reference signal sequence comprises;

obtaining a demodulation pilot sequence in a position of a currently scheduled time-frequency resource of the serving cell, wherein the demodulation pilot sequence is obtained based on the PRB bundling information, information about a PRB in which a transmission mode based on the user-terminal-specific reference signal sequence demodulation channel is used in the non-serving cell, and information about a first antenna port used in the non-serving cell to send the user-terminal-specific reference signal sequence, and wherein the demodulation pilot sequence is on the first antenna port and is used to demodulate a reference signal transmitted over the downlink transmission channel of the non-serving cell; and

performing channel estimation on the downlink transmission channel of the non-serving cell according to the obtained demodulation pilot sequence and based on the PRB bundling information; and

suppressing, according to an obtained channel estimation value and the pilot data power ratio information of the non-serving cell, the co-channel interference brought by the downlink transmission signal of the non-serving cell to the downlink transmission signal of the serving cell.

2. An apparatus, comprising:

one or more processors;

a non-transitory memory for storing computer instructions that, when executed by the one or more processors, are configured to cause the apparatus to;

receive interference information of a non-serving cell, wherein the interference information comprises a generation parameter, physical resource block (PRB) bundling information of the non-serving cell, and pilot data power ratio information of the non-serving cell, wherein the generation parameter is a physical cell identifier of the non-serving cell, and the pilot data power ratio information of the non-serving cell comprises a public parameter (PB) of the non-serving cell and a number of antenna ports of cell-specific reference signals (CRSs) of the non-serving cell, and wherein the apparatus is configured to assume, according to the PRB bundling information, PRBs that are applied with the same precoding; and

suppress, according to the received interference information, co-channel interference brought by a downlink transmission signal of the non-serving cell to a downlink transmission signal of a serving cell, wherein suppressing, according to the received interference information, the co-channel interference comprises;

determining a user-terminal-specific reference signal sequence of the non-serving cell according to the received generation parameter;

performing channel estimation on a downlink transmission channel of the non-serving cell according to the user-terminal-specific reference signal sequence, wherein performing channel estimation on the downlink transmission channel of the non-serving cell according to the user-terminal-specific reference signal sequence comprises;

obtaining a demodulation pilot sequence in a position of a currently scheduled time-frequency resource of the serving cell, wherein the demodulation pilot sequence is obtained based on the PRB bundling information, information about a PRB in which a transmission mode based on the user-terminal-specific reference signal sequence demodulation channel is used in the non-serving cell, and information about a first antenna port used in the non-serving cell to send the user-terminal-specific reference signal sequence, wherein the demodulation pilot sequence is on the first antenna port, and the demodulation pilot sequence is used to demodulate a reference signal transmitted over the downlink transmission channel; and

performing channel estimation on the downlink transmission channel of the non-serving cell according to the obtained demodulation pilot sequence and based on the PRB bundling information; and

suppressing, according to an obtained channel estimation value, the co-channel interference brought by the downlink transmission signal of the non-serving cell to the downlink transmission signal of the serving cell.