SRS Configuration for Full Bandwidth Transmission in 5G
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Solution Overview
Problem
Current SRS configurations in NR do not support full bandwidth transmission and lack flexibility in comb size and cyclic shifts, which limits positioning accuracy and efficiency in 5G networks.
Innovation Solution
Configuring SRS resources with adjustable comb sizes (up to 12) and cyclic shifts to enable full bandwidth transmission within a single resource, allowing for staggered frequency shifts and increased orthogonal cyclic shifts, enhancing positioning capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS resources are configured with fixed comb size and cyclic shifts, then device complexity is reduced, but positioning accuracy and bandwidth support are limited
Solution Approach 1:
The patent implements dynamic SRS configuration by introducing configurable comb sizes (2, 4, 8, 12) and variable cyclic shift values that can be adjusted based on bandwidth requirements and positioning accuracy needs. The network can dynamically select appropriate comb sizes and cyclic shift patterns through RRC signaling, allowing the system to adapt to different deployment scenarios rather than using fixed parameters.
Solution Approach 2:
The patent changes key parameters including comb size (expanded from traditional values to include 2, 4, 8, 12), cyclic shift ranges (0 to 11 for comb-12), and bandwidth configurations. These parameter changes enable the SRS to support full bandwidth transmission while maintaining orthogonality and avoiding collisions, thereby improving positioning accuracy without requiring complex additional mechanisms.
2Measurement precision
If SRS uses limited bandwidth transmission, then device complexity is reduced, but positioning accuracy and location estimation quality deteriorate
Solution Approach 1:
The patent segments the frequency domain into multiple subcarriers with different comb offsets, allowing the SRS to be transmitted across the full bandwidth in a structured manner. By dividing the bandwidth into segments that can be addressed through different comb sizes and cyclic shifts, the system achieves full bandwidth coverage while maintaining manageable configuration complexity through systematic resource allocation.
3Adaptability or versatility
If SRS configuration supports multiple comb sizes and cyclic shifts, then adaptability and bandwidth support are improved, but configuration complexity increases
Solution Approach 1:
The patent creates a universal SRS configuration framework that can handle multiple comb sizes (2, 4, 8, 12) and cyclic shift values within a single resource configuration structure. This multi-functional design allows the same SRS resource to adapt to different bandwidth requirements and positioning accuracy needs without requiring separate configuration mechanisms for each scenario, thereby improving versatility while controlling complexity.
4Measurement precision
If SRS transmission uses larger bandwidth, then positioning accuracy is improved, but signal interference and collision probability increase
Solution Approach 1:
The patent introduces asymmetric comb offset patterns where different symbols within the same SRS resource can have different comb offsets (e.g., first symbol with comb offset 0, second symbol with comb offset 1). This asymmetric configuration across symbols provides frequency diversity and reduces collision probability with other signals while maintaining full bandwidth utilization, thereby improving positioning accuracy without proportionally increasing interference.
Data Source
AI summary
A method, wireless device and network node for sounding reference signal (SRS) configuration for full bandwidth transmission are disclosed. According to one aspect, a method includes determining a sounding reference signal, SRS, pattern within a resource, the SRS pattern being based at least in part on at least one of a comb size, at least one comb offset, at least one cyclic shift and a number of orthogonal frequency division multiplexing, OFDM, symbols within the resource; and optionally, sending a configuration specifying the SRS pattern.