Sounding Reference Signal Compatibility in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in ensuring compatibility and orthogonality between different user equipment (UE) devices using older and newer sounding reference signal (SRS) techniques, particularly when incorporating new SRS regions, which can lead to interference and inefficient resource utilization.
Innovation Solution
The implementation of frequency domain subband hopping, scrambling sequence identifiers, comb types, sequence and group hopping, and open loop power control techniques allows for compatible SRS transmissions across different SRS regions, enabling UEs with varying capabilities to use either or both existing and added SRS regions without interference, by configuring symbol counters, scrambling sequence IDs, comb types, and power control parameters accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If new SRS regions are added to improve system capacity and support more UEs, then the quantity of substance increases, but interference between different UE populations occurs and orthogonality is compromised
Solution Approach 1:
The patent segments the SRS transmission resources by introducing different symbol counter behaviors for different SRS regions. Legacy UEs use a first symbol counter that wraps at a first threshold, while new UEs use a second symbol counter that wraps at a second threshold. This segmentation allows each UE type to operate independently in its designated resource space, preventing interference while maintaining overall system capacity.
Solution Approach 2:
The patent applies local quality by configuring different wrapping thresholds for different UE types. Legacy UEs are configured with a first wrapping threshold appropriate for existing SRS regions, while new UEs are configured with a second wrapping threshold for extended SRS regions. This localized configuration ensures that each UE type maintains orthogonality within its specific operational context without affecting other UE types.
2Reliability
If different symbol counter wrapping thresholds are used to maintain orthogonality between legacy and new UEs, then reliability improves, but device complexity increases due to multiple counter configurations
Solution Approach 1:
The patent implements universality by designing a unified symbol counter mechanism that serves multiple UE types. The symbol counter is configured with a wrapping threshold parameter that can be set to different values depending on the UE type. This single counter structure performs the function of both legacy and new UE resource allocation, eliminating the need for separate counter implementations and reducing overall device complexity.
Solution Approach 2:
The patent uses parameter changes to resolve the contradiction by making the wrapping threshold a configurable parameter rather than a fixed value. The network can dynamically adjust the wrapping threshold parameter based on the UE type and SRS region configuration. This parameter-based approach allows the system to maintain reliability through appropriate threshold selection while keeping device complexity low through a unified counter implementation.
Data Source
AI summary
Techniques for compatibility between UEs that transmit SRS in only an existing SRS region and UEs that can transmit SRS using resources in an existing SRS region, an added SRS region, or both. Techniques for frequency domain subbband hopping using counters or subband hop shifts are disclosed. Techniques for compatibility for SRS transmissions that can use different scrambling sequence IDs, comb types, sequence/group hopping, and open loop power control are disclosed.