Symmetric Reference Signal Pattern for Wireless Channel Estimation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing reference signals across uplink and downlink channels, leading to increased complexity and interference, particularly in scenarios where the same reference signal design is not symmetric or optimized for both channels.
Innovation Solution
The proposed solution involves determining a common reference signal pattern for both uplink and downlink channels based on transmission factors, using the same pattern for both channels to reduce complexity and improve interference estimation and cancellation, while allowing for flexible waveform designs such as OFDM and SC-FDM to accommodate varying power requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different reference signal patterns are used for uplink and downlink channels, then channel-specific optimization is achieved, but system complexity increases and interference management becomes more difficult
Solution Approach 1:
The patent applies universality by designing a reference signal pattern that serves both uplink and downlink channels. The same pattern is used for allocating reference signals in both directions, allowing the system to maintain channel estimation accuracy while reducing the complexity of managing different patterns. This multi-functional approach eliminates the need for separate pattern sets for uplink and downlink.
Solution Approach 2:
The patent employs asymmetry in the sense that while the reference signal pattern is symmetric (same for uplink and downlink), the transmission factors and power requirements remain asymmetric between the two channels. The system handles this by applying the same pattern framework while allowing different transmission parameters to be optimized for each channel's specific needs.
2Device complexity
If a common reference signal pattern is used for both uplink and downlink, then design simplicity and interference cancellation improve, but channel-specific optimization may be compromised
Solution Approach 1:
The patent applies segmentation by dividing the reference signal allocation into two independent parts: the common pattern framework and the channel-specific transmission factors. The pattern itself remains unified and simple, while the transmission characteristics (power, timing, frequency) can be separately optimized for each channel. This segmentation allows simplicity in pattern design while maintaining adaptability through independent parameter adjustment.
Solution Approach 2:
The patent implements local quality by allowing different transmission factors to be applied to the same reference signal pattern for uplink and downlink channels. While the overall pattern structure is uniform, the local transmission characteristics can be optimized for each channel's specific requirements, such as power levels and timing, thereby maintaining channel-specific optimization capability.
3Reliability
If reference signals are allocated with high precision for channel estimation, then communication reliability improves, but time and frequency resources are consumed
Solution Approach 1:
The patent applies merging by combining the reference signal allocation strategies for uplink and downlink channels into a single unified pattern. This consolidation allows the system to achieve reliable channel estimation for both directions using the same time and frequency resources, effectively doubling the utility of each allocated resource slot without requiring separate dedicated resources for each channel type.
Data Source
AI summary
Various additional and alternative aspects are described herein. In some aspects, the present disclosure provides a method for wireless communication. The method includes determining at least one RS pattern for allocating a reference signal on an uplink channel and a downlink channel based on one or more transmission factors for transmitting the reference signal, wherein at least a portion of the at least one RS pattern is the same for the uplink channel and the downlink channel. The method further includes transmitting the reference signal using the determined RS pattern.