NAICS Interference Cancellation in LTE-A Wireless Systems
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Solution Overview
Problem
In LTE/LTE-A wireless communication systems, interference signals significantly hinder downlink data reception performance, and existing methods like NAICS require improved interference detection and cancellation techniques to enhance reception quality.
Innovation Solution
A method and apparatus for a UE to check transmission parameters related to interfering cells, determine the presence/absence of interference signals, and decide on NAICS technology application for effective interference cancellation and suppression, optimizing decoding processes based on interference characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NAICS technology is applied to cancel interference signals, then downlink data reception performance is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent applies preliminary action by having the base station pre-configure interference signal parameters (modulation scheme, coding rate, resource allocation) before the UE performs interference cancellation. The UE receives and stores these parameters in advance, so when interference occurs, the UE can directly use the pre-configured parameters to cancel the interference signal without performing complex real-time detection and parameter estimation, thus improving reception performance while limiting complexity increase
Solution Approach 2:
The patent implements feedback by having the UE measure interference signal characteristics and feed back interference indication information to the base station. The base station then adjusts the interference cancellation parameters based on this feedback. This closed-loop approach allows the system to adapt to changing interference conditions while distributing the computational complexity between the base station and UE
2Reliability
If interference cancellation processing is performed, then reception quality is improved, but processing time and decoding delay increase
Solution Approach 1:
The patent reduces processing time by having the base station pre-configure interference signal parameters in advance. When the UE needs to cancel interference, it can directly use the pre-configured parameters rather than performing time-consuming real-time detection and parameter estimation, thus improving reception quality while minimizing additional decoding delay
Solution Approach 2:
The patent applies partial action by having the UE selectively perform interference cancellation only when interference is detected above a certain threshold. The UE determines whether to apply NAICS based on interference signal strength and characteristics, performing the complex cancellation processing only when necessary. This approach improves reception quality in interference scenarios while avoiding unnecessary processing time overhead in clean signal conditions
3Productivity
If the UE determines presence/absence of interference signals and applies NAICS selectively, then system capacity increases, but measurement and detection complexity increases
Solution Approach 1:
The patent uses the base station as an intermediary to simplify UE detection complexity. The base station performs or assists in measuring interference signal parameters (modulation scheme, coding rate, resource allocation) and provides this information to the UE. The UE then uses this intermediary-provided information to determine the presence of interference and apply NAICS, thereby increasing system capacity while the base station handles the complex measurement and detection tasks
Solution Approach 2:
The patent implements a feedback mechanism where the UE measures interference characteristics and feeds back interference indication information to the base station. The base station uses this feedback to determine whether interference is present and configures appropriate NAICS parameters. This distributes the detection complexity between UE and base station, enabling system capacity improvement while managing the difficulty of interference detection through collaborative processing
Data Source
AI summary
A method for receiving downlink data by a User Equipment (UE) in a wireless communication system is provided. The method includes checking a transmission parameter related to data transmitted from an interfering cell, determining presence/absence of an interference signal based on the transmission parameter, determining whether to apply Network Assisted Interference Cancellation and Suppression (NAICS) technology based on at least one of the transmission parameter or the presence/absence of the interference signal, and decoding the downlink data depending on whether to apply the NAICS technology.