Reference Signal Density Adaptation for LTE Channel Estimation
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Solution Overview
Problem
Current LTE systems face challenges in tailoring channel estimation performance to the specific needs of User Equipment (UE) due to statically configured reference signals, which can result in inadequate channel quality and increased overhead when dealing with varying radio conditions and interference.
Innovation Solution
Dynamic configuration of reference signal resources by radio network nodes to adjust the density and periodicity of CSI-RS transmissions based on UE-specific needs, using feedback and RSRP reports to optimize channel estimation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are transmitted with fixed pattern and high density, then channel estimation accuracy is improved, but overhead and interference increase
Solution Approach 1:
The patent implements dynamic reference signal configuration where the density, periodicity, and resources of reference signals are adapted based on UE-specific channel conditions, mobility state, and service requirements. This allows the system to transmit reference signals only when and where needed, improving channel estimation accuracy for UEs requiring it while reducing overhead for UEs with good channel conditions.
Solution Approach 2:
The patent applies different reference signal configurations to different UEs based on their specific needs. Each UE can be configured with appropriate reference signal density and periodicity tailored to its channel conditions, mobility state, and service type, rather than using a uniform configuration for all UEs.
2Measurement precision
If reference signal density is increased for all UEs, then channel estimation performance is improved, but system overhead increases
Solution Approach 1:
The patent changes the parameters of reference signal configuration (density, periodicity, resources) dynamically based on UE-specific conditions such as channel quality, mobility state, and service requirements. This allows optimization of channel estimation performance while controlling system overhead by adjusting parameters rather than uniformly increasing density.
Solution Approach 2:
The patent applies reference signal transmission selectively - not all UEs receive high-density reference signals at all times. Only UEs with specific needs (poor channel conditions, high mobility, certain service types) receive increased reference signal density, while other UEs use standard or reduced density configurations.
3Device complexity
If statically configured reference signals are used, then system complexity is reduced, but adaptability to varying radio conditions deteriorates
Solution Approach 1:
The patent transitions from static to dynamic reference signal configuration. The network configures reference signal parameters dynamically based on UE feedback, channel conditions, and service requirements, enabling the system to adapt to varying radio conditions while maintaining manageable complexity through standardized configuration procedures.
Solution Approach 2:
The patent utilizes UE feedback (such as CQI reports, mobility measurements) to dynamically adjust reference signal configurations. This feedback mechanism enables the system to adapt to changing radio conditions without requiring complex real-time reconfiguration, as the adjustments are based on standardized feedback information already available in the system.
Data Source
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AI summary
According to some embodiments, a method of adapting reference signals of a wireless network comprises establishing a first wireless connection with a first user equipment. The first wireless connection is associated with one or more references signals and each of the one or more reference signals is associated with one or more antenna ports. The method further comprises mapping one of the one or more reference signals associated with one or more antenna ports to at least two antenna port reference signal resources (APRSR) for the first user equipment, wherein the APRSR comprises a pair of consecutive time-frequency resource elements of a radio subframe of the first wireless connection.