2D-AAS Reference Signal Feedback for Interference Management
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Solution Overview
Problem
In multi-antenna wireless communication systems, existing methods face challenges in efficiently feeding back reference signal information, particularly in systems with extended antenna configurations like LTE-A, which require accurate channel estimation and interference management across multiple antennas.
Innovation Solution
A method for a user equipment (UE) in a two-dimensional active antenna system (2D-AAS) that receives and measures reference signal configurations, including identifiers and precoded reference signals from both a base station and neighboring stations, and transmits feedback information on received power to determine precoding and interference, allowing for efficient channel estimation and interference management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple reference signals are transmitted from multiple antennas, then channel estimation accuracy is improved, but feedback overhead increases
Solution Approach 1:
The patent segments the feedback process into two distinct phases: first, the UE feeds back only the indices of selected reference signals from multiple candidate RSs; second, the eNB transmits only the corresponding precoding matrices for those selected RSs. This segmentation reduces feedback overhead by avoiding transmission of all possible RS information while maintaining channel estimation accuracy through selective measurement of multiple precoded RSs.
Solution Approach 2:
The patent applies local quality by having the UE select and measure only specific reference signals that are most relevant to the current channel conditions, rather than measuring all reference signals uniformly. The eNB then provides precoding matrices specifically tailored to those selected local reference signals, optimizing the quality of channel estimation where it matters most while reducing overall feedback requirements.
2Productivity
If extended antenna configuration is used, then data transmission rate is improved, but system complexity increases
Solution Approach 1:
The patent segments the large set of antenna ports into multiple groups, each with its own reference signals. The UE selects reference signals from different groups and provides feedback on a subset, which reduces the complexity of managing extended antenna configurations while maintaining high data transmission rates through selective precoding.
Solution Approach 2:
The patent changes the parameter of reference signal measurement by introducing the concept of selecting only certain reference signals based on UE feedback rather than measuring all reference signals from extended antenna configurations. This parameter change reduces system complexity while preserving the benefits of extended antennas for high data rates.
3Measurement precision
If separate reference signals are used for pre-coded and non-pre-coded channel information, then channel state information accuracy is improved, but reference signal overhead increases
Solution Approach 1:
The patent merges the functions of reference signals for pre-coded and non-pre-coded channel information by using the same selected reference signals for both purposes. The UE selects reference signals that provide accurate channel state information, and the eNB uses these same signals for both precoding and non-precoding operations, reducing reference signal overhead while maintaining CSI accuracy.
Solution Approach 2:
The patent makes reference signals universal by designing them to serve multiple functions simultaneously. The selected reference signals are used for both acquiring pre-coded channel information and non-pre-coded channel information, eliminating the need for separate dedicated reference signals and reducing overall reference signal overhead while maintaining accurate channel state information.
Data Source
AI summary
The present invention relates to a method and apparatus for feeding back, by a terminal, reference signal information in wireless communication using a two-dimensional active antenna system including a plurality of antennas. Particularly, the method for feeding back reference signal information comprises the steps of: receiving, from a base station, a reference signal configuration including identifiers of a plurality of reference signals having a first reference signal set and a second reference signal set; receiving the plurality of reference signals to which the precoding is applied; measuring reference signal received power (RSRP) for each of the plurality of reference signals; and transmitting, to the base station, information on at least a part of the first reference signal set and information on at least a part of the second reference signal set, on the basis of the measured RSRP. In addition, the precoding for the terminal is determined on the basis of the information on at least a part of the first reference signal set, and the interference information for the terminal can be determined on the basis of the information on at least a part of the second reference signal set.