Reference Signal Grouping for Massive MIMO Overhead Reduction
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Solution Overview
Problem
In massive MIMO systems, the increasing number of antennas leads to a significant overhead in reference signal (RS) transmission, which hampers efficient data transmission and channel estimation, especially in 3GPP LTE and LTE-Advanced systems.
Innovation Solution
The proposed method involves grouping multiple resource blocks (RBs) into a resource block group and mapping reference signals from multiple antennas into a single RB within this group, allowing efficient transmission and reception of reference signals, thereby reducing RS overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antennas is increased in massive MIMO systems, then channel capacity and data transmission capability are improved, but reference signal overhead increases significantly
Solution Approach 1:
The patent combines reference signals from multiple antenna ports into a single resource block by mapping them to the same time-frequency resources. This merging approach allows the system to maintain support for a large number of antennas while significantly reducing the total number of reference signal resources required, thereby resolving the contradiction between data transmission capability and reference signal overhead.
Solution Approach 2:
The patent makes a single resource block serve multiple functions by having it carry reference signals for multiple antenna ports simultaneously. This multi-functionality allows the reference signal structure to scale with the number of antennas without proportionally increasing resource consumption, thus improving productivity while controlling the quantity of reference signals.
2Measurement precision
If reference signals are transmitted for each antenna port separately, then channel estimation accuracy is maintained, but resource consumption increases
Solution Approach 1:
The patent merges reference signals from multiple antenna ports into the same resource block, allowing channel estimation for multiple antennas using shared time-frequency resources. This approach maintains measurement precision through proper signal design while significantly reducing resource consumption compared to separate transmission for each antenna port.
3Reliability
If reference signals are mapped to every resource block for each antenna, then channel estimation reliability is improved, but system efficiency deteriorates due to high overhead
Solution Approach 1:
The patent combines reference signals from multiple antenna ports into shared resource blocks, maintaining channel estimation reliability through proper mapping and estimation algorithms while reducing overall overhead. This improves system efficiency by freeing up resources for data transmission while preserving the reliability needed for accurate channel state information.
Data Source
AI summary
Reference signals (RSs) transmission scheme for massive MIMO system is disclosed. For this, ‘M’ resource blocks (RBs) are grouped into a resource block group (M>1). One or more antenna ports are grouped into one antenna group, wherein each of the antenna ports corresponds to each of the multiple antennas. The reference signals of the one antenna group are mapped into only one RB within one resource block group.