Staggered SRS Waveform Design for Wireless Communications
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face inefficiencies due to the need for multiple Listen-Before-Talk (LBT) gaps, which reduce network efficiency and capacity, especially when multiple UEs need to transmit Sounding Reference Signals (SRS).
Innovation Solution
The proposed solution involves staggering SRS transmissions in frequency across multiple OFDM symbols and applying an orthogonal cover code (OCC) to allow multiple UEs to transmit SRS using a common LBT gap, thereby reducing the number of required LBT gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple UEs transmit SRS using separate LBT gaps, then each UE can successfully transmit its SRS, but the number of LBT gaps increases, reducing network efficiency and capacity
Solution Approach 1:
The patent combines multiple SRS transmissions from different UEs into a single common LBT gap by staggering their frequency resources across OFDM symbols. This merging approach allows multiple UEs to share the same LBT gap instead of requiring separate gaps for each UE, thereby improving network efficiency while maintaining reliable SRS transmission for all UEs.
Solution Approach 2:
The patent introduces frequency domain staggering across multiple OFDM symbols as an additional dimension for resource allocation. By distributing SRS transmissions across different frequency resources in different OFDM symbols within the same LBT gap, the system enables multiple UEs to coexist in time-frequency space without requiring multiple separate LBT gaps.
2Productivity
If SRS transmissions are staggered in frequency across multiple OFDM symbols, then multiple UEs can share a common LBT gap, but the SRS waveform design becomes more complex
Solution Approach 1:
The patent segments the SRS transmission resources across multiple OFDM symbols in the frequency domain, allocating different frequency subsets to different UEs within the same LBT gap. This segmentation approach systematically manages the complexity by dividing the overall SRS transmission into manageable frequency portions while enabling efficient resource sharing.
3Productivity
If a common LBT gap is used for multiple UEs, then the number of LBT gaps is reduced, but interference management between UEs becomes more challenging
Solution Approach 1:
The patent utilizes frequency domain separation across multiple OFDM symbols as an additional dimension to mitigate interference. By staggering SRS transmissions in the frequency domain across different OFDM symbols within the common LBT gap, the system reduces interference between UEs while maintaining the efficiency benefits of a shared LBT gap.
Data Source
AI summary
Techniques and devices for wireless communications are described that provide for staggering sounding reference signal (SRS) transmissions in frequency across multiple orthogonal frequency division multiplexing (OFDM) symbols, which may allow multiple UEs to transmit SRS using a common listen-before-talk (LBT) gap for a LBT procedure. The techniques also provide for transmitting an SRS across multiple OFDM symbols using same frequency resources, and an orthogonal cover code (OCC) may be applied to the SRS transmission of each OFDM symbol, which may allow multiple UEs to transmit concurrent SRS using a common LBT gap.