NAICS Assistance Information for Interference Cancellation
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Solution Overview
Problem
High-speed receivers in communication systems require knowledge of interference signals to mitigate interference, but this increases signaling overhead and computational load for base stations, especially when they have limited knowledge of interference signals.
Innovation Solution
A base station apparatus and method that transmits NAICS assistance information to terminal apparatus, including physical cell ID, number of antenna ports for cell-specific reference signals, MBSFN subframe, transmission mode, and power ratios of downlink shared channels, to help terminal apparatuses cancel or suppress interference from neighboring cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station apparatus transmits detailed interference signal information to the terminal apparatus, then interference cancellation performance is improved, but signaling overhead is increased
Solution Approach 1:
The patent extracts only the essential interference signal parameters (physical cell ID, antenna port configuration, power ratios) needed for interference cancellation, omitting unnecessary detailed information. This selective extraction achieves effective interference suppression while minimizing signaling overhead transmission from base station to terminal apparatus.
Solution Approach 2:
The patent applies partial action by providing only the necessary portion of interference signal information required for NAICS operation, rather than transmitting complete interference signal characteristics. This partial information approach is sufficient for effective interference cancellation while avoiding excessive signaling overhead.
2Loss of energy
If the base station apparatus has limited knowledge of interference signals, then signaling overhead is reduced, but the terminal apparatus requires increased computational estimation
Solution Approach 1:
The patent introduces NAICS assistance information as an intermediary mechanism that bridges the base station and terminal apparatus. This intermediary provides the terminal with essential interference parameters without requiring the base station to have complete interference knowledge, thereby reducing base station complexity while avoiding excessive terminal computational burden through structured information provision.
3Productivity
If high-speed receiver with interference cancellation is implemented, then frequency efficiency is improved, but device complexity is increased
Solution Approach 1:
The patent applies preliminary action by having the base station prepare and transmit NAICS assistance information containing interference signal parameters before the actual interference cancellation operation. This preliminary information provision enables the terminal apparatus to perform efficient interference cancellation without requiring complex real-time analysis, thus improving frequency efficiency while controlling receiver complexity.
Data Source
AI summary
A terminal apparatus is a terminal apparatus that communicates with a base station apparatus and includes a reception unit that receives NAICS assistance information from the base station apparatus. The NAICS assistance information includes assistance information used by the terminal apparatus in order to cancel or suppress interference of an neighbor cell and includes information related to power of a downlink shared channel used by the base station apparatus. The assistance information includes information related to a physical cell ID, information related to the number of antenna ports for a cell-specific reference signal, information related to an MBSFN subframe, a transmission mode, information related to a power ratio of the downlink shared channel between OFDM symbols, and information related to a power ratio of the cell-specific reference signal and the downlink shared channel.