PRS Resource Mapping Rotation for Wireless Interference Reduction
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Solution Overview
Problem
The conventional PRS resource mapping mechanism in wireless communication networks leads to high interference, making it difficult for receivers to estimate channels effectively due to overlapping PRS resources.
Innovation Solution
Implement an enhanced PRS resource mapping mechanism that rotates the frequency offset based on the starting symbol of the PRS within a slot, using circular shifts to mitigate interference among PRS resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PRS resource mapping mechanism is used, then resource allocation is simple, but interference between PRS resources increases and channel estimation becomes difficult
Solution Approach 1:
The patent applies dynamics by making the frequency offset dynamic rather than static. The frequency offset is rotated based on the starting symbol position of the PRS resource within a slot, allowing the mapping pattern to adapt dynamically to different time positions. This dynamic adjustment reduces interference between PRS resources while maintaining manageable complexity through a systematic rotation approach.
Solution Approach 2:
The patent changes the frequency offset parameter dynamically based on the starting symbol position. By rotating the frequency offset according to the time-domain position of the PRS resource, the system modifies the mapping parameters adaptively. This parameter change approach resolves the contradiction by improving channel estimation accuracy through reduced interference while keeping the mapping mechanism systematic and controllable.
2Productivity
If PRS resources are densely packed to increase capacity, then network throughput improves, but interference and collisions between PRS resources increase
Solution Approach 1:
The patent applies local quality by making the frequency offset specific to each PRS resource's local time position. The frequency offset is rotated based on the starting symbol position, creating a localized mapping pattern for each PRS resource. This allows dense packing of PRS resources in the time domain while maintaining distinguishable frequency mappings locally, thus increasing network throughput without proportionally increasing interference.
Solution Approach 2:
The patent transitions from a static, one-dimensional frequency mapping to a two-dimensional mapping that incorporates both time (starting symbol position) and frequency (rotated offset) dimensions. By adding the time dimension to the frequency offset determination, the system can pack more PRS resources densely while using the frequency rotation to differentiate them, thereby increasing throughput while managing interference through dimensional separation.
3Measurement precision
If frequency offset is fixed for all PRS resources, then configuration is simple, but receivers cannot effectively distinguish overlapping PRS resources
Solution Approach 1:
The patent applies preliminary action by pre-defining a set of frequency offsets that can be rotated based on the starting symbol position. The rotation operation is predetermined and systematic, allowing receivers to anticipate and calculate the appropriate frequency offset for each PRS resource based on its time position. This preliminary setup enables effective distinction of overlapping PRS resources while keeping the frequency offset management systematic and computationally manageable.
Data Source
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AI summary
A system and method for interference management. The system and method include configuring, by a wireless communication node, a resource mapping pattern for a reference signal; and updating, by the wireless communication node based on a time-domain position of the reference signal, the resource mapping pattern by changing a sequence that represents a plurality of frequency-domain offsets of the reference signal relative to a frequency-domain position of the reference signal.