Serving Cell Interference Cancellation via Traffic Load Assessment
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Solution Overview
Problem
In 3GPP LTE networks, interference from neighbor cells' CSI-RS and PDSCH signals can significantly degrade the reception performance of serving cell signals, particularly in heterogeneous networks with co-existing macro and small cells, where traditional interference cancellation methods increase complexity and do not effectively address inter-cell interference.
Innovation Solution
A method is proposed where the serving cell assesses traffic loads of itself and neighboring cells to determine the target for interference cancellation, transmitting network assistance information to user equipment (UE) to enable effective removal of interference from either neighbor cell's CSI-RS or PDSCH, by allocating zero power CSI-RS resources and providing configuration details such as antenna ports, resource configurations, and power ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional interference cancellation methods are used to remove interference from neighbor cell signals, then interference cancellation capability is improved, but device complexity increases
Solution Approach 1:
The serving cell base station performs preliminary actions by determining the traffic loads of both serving and neighbor cells, identifying the interference cancellation target in advance, and transmitting network assistance information to the user equipment before the UE needs to perform interference cancellation. This allows the UE to have prior knowledge of which signals to cancel, reducing the complexity of real-time interference cancellation operations.
Solution Approach 2:
The base station acts as an intermediary by transmitting network assistance information that identifies the interference cancellation target (either neighbor cell CSI-RS or PDSCH). This intermediary information guides the UE's interference cancellation process, reducing the computational burden on the UE while maintaining effective interference cancellation capability.
2Reliability
If network assistance information is transmitted to enable interference cancellation, then reception performance is improved, but information overhead increases
Solution Approach 1:
The base station transmits network assistance information selectively based on local conditions - specifically, only when the traffic load conditions indicate that interference cancellation is needed. The assistance information includes only the necessary elements (interference cancellation target identification, resource configuration parameters) relevant to the specific interference scenario, avoiding unnecessary information overhead while maintaining reception performance.
3Reliability
If interference cancellation target is determined based on traffic load assessment, then interference cancellation effectiveness is improved, but processing time increases
Solution Approach 1:
The base station performs traffic load assessment and determines the interference cancellation target in advance, before the UE needs to receive and process the data. By transmitting the determined target information through network assistance information, the base station eliminates the need for the UE to perform complex real-time traffic load analysis, significantly reducing processing time while maintaining interference cancellation effectiveness.
Data Source
AI summary
A method is provided for transmitting network assistance information in a serving cell in order to perform interference cancellation of a terminal. The serving cell checks whether a traffic load of the serving cell is greater than or less than a first value, and whether a traffic load of a neighbor cell is greater than or less than a second value. The serving cell determines a target for which the interference cancellation is to be performed by the terminal, based on a result of the checking the traffic load of the serving cell and a result of the checking the traffic load of the neighbor cell. The serving cell transmits to the terminal the network assistance information including information regarding the determined target for which the interference cancellation is to be performed.