Interference Cancellation Parameter Handling During Cell Handover
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Solution Overview
Problem
Current interference cancellation methods in LTE and LTE-A systems, particularly in heterogeneous and small-cell networks, suffer from poor interference cancellation effects due to limitations in handling interference cancellation parameters during cell reestablishment or handover, leading to reduced downlink throughput and inefficient spectrum resource utilization.
Innovation Solution
A user terminal and network-side device system that receives and applies interference cancellation parameters, with specific rules for continuing or releasing these parameters during cell reestablishment or handover, ensuring effective interference cancellation across various channels and configurations, including cell identity, pilot information, modulation mode, and TDD configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ABS (Almost Blank Subframe) manner is used to reduce downlink interference, then interference to neighboring cells is reduced, but utilization of downlink spectrum resources of the specified cell is reduced
Solution Approach 1:
The patent extracts the interference cancellation capability from the ABS mechanism by enabling user terminals to cancel interference from neighboring cells' CRS and PDSCH signals on their own, rather than requiring the serving cell to blank its transmissions. This allows the serving cell to maintain normal downlink transmission while users independently remove harmful interference components.
Solution Approach 2:
The user terminal performs self-service interference cancellation by receiving interference cancellation parameters (such as CRS-related parameters and PDSCH-related parameters of neighboring cells) and using these parameters to cancel interference from the received downlink data, eliminating the need for the network to sacrifice its own transmission resources.
2Adaptability or versatility
If interference cancellation parameters are transmitted to user terminal, then interference cancellation capability is provided, but interference cancellation effect is impaired during cell reestablishment or handover
Solution Approach 1:
The patent applies preliminary action by having the user terminal store interference cancellation parameters before cell reestablishment or handover occurs. When the radio link fails or handover is needed, the terminal retrieves and continues to use the previously stored parameters, ensuring uninterrupted interference cancellation functionality during the critical transition period.
Solution Approach 2:
The patent provides beforehand cushioning by maintaining interference cancellation parameters in the user terminal as a backup resource. When cell reestablishment or handover occurs, these pre-stored parameters serve as a cushion that prevents interruption of interference cancellation, ensuring continuous protection against neighboring cell interference during the vulnerable transition period.
Data Source
AI summary
An interference cancellation method and device are disclosed. In a process of performing cell reestablishment or cell handover, for any interference cancellation parameter previously received from a network-side device, a user terminal can continue to apply the interference cancellation parameter to perform an interference cancellation operation according to a specified first interference cancellation parameter application rule or first instruction information delivered by the network-side device, or release or no longer apply the interference cancellation parameter. In this way, a currently existing problem that a user terminal cannot know how to process a previously received interference cancellation parameter in a process of performing cell reestablishment or cell handover can be resolved, and further, an objective of improving an interference cancellation effect can be achieved.