Partial-Overlap Frequency Hopping for Spectral Efficiency
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Solution Overview
Problem
Existing wireless communication systems face challenges in optimizing spectral efficiency and reducing latency, particularly in 5G networks, due to limitations in frequency hopping schemes that do not effectively utilize partial inter-hop bandwidth overlap.
Innovation Solution
A frequency hopping scheme is implemented where a reference signal is measured and transmitted on overlapping sub-bands of an effective RS bandwidth at different hops, enabling efficient use of partial inter-hop bandwidth overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency hopping scheme uses non-overlapping sub-bands at different hops, then interference avoidance is improved, but spectral efficiency deteriorates
Solution Approach 1:
The patent applies partial overlap of sub-bands between frequency hops instead of complete non-overlapping or complete overlapping. Specifically, the second sub-band partially overlaps with the first sub-band in the frequency domain, allowing some frequency resources to be reused while maintaining diversity. This partial action resolves the contradiction by achieving both interference avoidance (through frequency diversity) and spectral efficiency (through resource reuse).
Solution Approach 2:
The patent changes the frequency domain parameters by introducing a configurable overlap factor between sub-bands at different hops. The second sub-band is shifted relative to the first sub-band by a controlled amount, creating partial overlap. This parameter change allows the system to balance between interference avoidance and spectral efficiency by adjusting the degree of overlap according to channel conditions and traffic requirements.
2Productivity
If frequency hopping scheme uses partial inter-hop bandwidth overlap, then spectral efficiency is improved, but measurement complexity increases
Solution Approach 1:
The patent segments the frequency domain into multiple sub-bands and applies different hopping patterns to different sub-band segments. The reference signal bandwidth is divided into first and second sub-bands, with the second sub-band partially overlapping the first. This segmentation allows the system to manage measurement complexity by processing different frequency segments separately while still achieving overall spectral efficiency improvement through the partial overlap design.
3Speed
If frequency hopping scheme uses partial inter-hop bandwidth overlap, then data transfer speed is improved, but latency may increase due to additional processing
Solution Approach 1:
The patent performs preliminary configuration of the frequency hopping pattern and sub-band overlap parameters in advance, before actual data transmission. The network configures the UE with the reference signal bandwidth, sub-band division, and overlap characteristics ahead of time. This preliminary action reduces processing latency during actual transmission, as the UE already has the necessary configuration information ready, while still achieving improved data transfer speeds through the optimized partial overlap frequency hopping scheme.
Data Source
AI summary
In an aspect, a wireless node (e.g., UE or BS) measures, at a first hop of a frequency hopping scheme, a reference signal (RS) on a first sub-band of an effective RS bandwidth, and measures, at a second hop of the frequency hopping scheme, the RS on a second sub-band of the effective RS bandwidth, the first and second sub-bands of the effective RS bandwidth overlapping in part. In another aspect, a UE transmits, at a first hop of a frequency hopping scheme, a reference signal (RS) on a first sub-band of an effective RS bandwidth, and transmits, at a second hop of the frequency hopping scheme, the RS on a second sub-band of the effective RS bandwidth, the first and second sub-bands of the effective RS bandwidth overlapping in part.