Base Station Interference Information Configuration
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Solution Overview
Problem
In communication systems like WCDMA, LTE, and WiMAX, terminal apparatuses at cell or sector edges face interference from neighboring cells or sectors, leading to decreased frequency efficiency, and high-speed receivers require knowledge of interference signals to mitigate this, increasing signaling overhead and computational load.
Innovation Solution
A base station apparatus configures and transmits specific interference information to terminal apparatuses to mitigate interference from cell-specific reference signals, downlink shared channels, downlink control channels, and enhanced downlink shared channels, reducing the need for terminal apparatuses to estimate interference signals and thereby decreasing computational load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station apparatus transmits knowledge or information related to interference signals to the terminal apparatus, then interference mitigation capability is improved, but signaling overhead is increased
Solution Approach 1:
The interference information is segmented into four distinct types (first through fourth interference information) corresponding to different interference sources (cell-specific reference signal, downlink shared channel, downlink control channel, enhanced downlink shared channel). This segmentation allows the base station to selectively transmit only the relevant interference information types needed by the terminal apparatus, reducing overall signaling overhead while maintaining effective interference mitigation capability.
2Loss of information
If the terminal apparatus estimates information related to interference signals, then signaling overhead is reduced, but the amount of calculation of the terminal apparatus is increased
Solution Approach 1:
The base station apparatus acts as an intermediary by measuring and determining interference information from neighboring cells and then transmitting this pre-processed information to the terminal apparatus. This eliminates the need for the terminal apparatus to perform complex interference signal estimation calculations, as the base station has already performed the measurement and processing functions on behalf of the terminal.
3Productivity
If high speed receiver with interference mitigation is used, then frequency efficiency is improved, but device complexity is increased
Solution Approach 1:
The base station apparatus performs preliminary measurement and determination of interference information from neighboring cells before transmitting it to the terminal apparatus. By pre-processing the interference information at the base station, the terminal apparatus receives ready-to-use interference parameters that simplify its receiver processing, thereby achieving effective interference mitigation without requiring overly complex high-speed receiver structures at the terminal.
Data Source
AI summary
Technical ProblemTo mitigate interference by using effective knowledge or information as to an interference signal.Solution to ProblemThere is provided a base station apparatus including a higher layer which configures, in a terminal apparatus, first interference information used in the terminal apparatus in order to mitigate interference from a cell-specific reference signal and at least one of second interference information used in the terminal apparatus in order to mitigate interference from a downlink shared channel, third interference information used in the terminal apparatus in order to mitigate interference from a downlink control channel, and fourth interference information used in the terminal apparatus in order to mitigate interference from an enhanced downlink shared channel, in which each of the second interference information, the third interference information, and the fourth interference information is configured only in a case where the first interference information is being configured.