SRS Comb Offset Randomization for Multi-TRP Interference Reduction
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Solution Overview
Problem
Interference between Sounding Reference Signal (SRS) transmissions from multiple user equipments (UEs) to multiple base stations or Transmission and Reception Points (TRPs) hinders accurate channel quality determination.
Innovation Solution
Implementing mechanisms for frequency domain interference randomization, code domain interference randomization, and power control by dynamically changing comb offsets and cyclic shifts for SRS transmissions, and configuring SRS power control parameters per TRP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UEs transmit SRS simultaneously to multiple base stations or TRPs, then channel quality determination can be performed for multiple connections, but persistent interference occurs between SRS transmissions from different UEs
Solution Approach 1:
The patent applies dynamics by making the comb offset configurable and changeable across different SRS transmission occasions. Instead of using a fixed comb offset, the system dynamically adjusts the comb offset value based on TRP identification and transmission occasion parameters, allowing the frequency domain resources to shift and avoid persistent interference patterns between multiple UEs transmitting to multiple TRPs.
Solution Approach 2:
The patent changes the comb offset parameter based on the TRP index and SRS transmission occasion. By modifying this key parameter dynamically, the system enables different UEs to use different frequency domain positions for their SRS transmissions when targeting different TRPs, thereby reducing interference while maintaining the ability to perform channel quality determination across multiple connections.
2Ease of operation
If comb offset is fixed for SRS transmissions, then transmission configuration is simple, but interference patterns become persistent and unchangeable
Solution Approach 1:
The patent transforms the static comb offset into a dynamic parameter that changes based on TRP identification and transmission occasion. This allows the system to maintain operational simplicity through automated configuration while achieving reliable interference avoidance through adaptive resource allocation across different TRPs and time occasions.
Solution Approach 2:
The system implements self-service by automatically determining the comb offset based on pre-configured parameters and current transmission context (TRP index, occasion number). The UE autonomously selects appropriate frequency domain resources without requiring complex manual configuration, achieving both ease of operation and reliable interference avoidance through rule-based dynamic adaptation.
3Quantity of substance
If SRS transmissions use the same frequency resources, then resource utilization is efficient, but interference prevents accurate channel quality assessment
Solution Approach 1:
The patent segments the frequency domain resources by applying different comb offsets for different TRPs and transmission occasions. This segmentation divides the available frequency resources into distinct sets for different transmission targets, allowing multiple UEs to transmit simultaneously without interference while maintaining efficient overall resource utilization through structured allocation.
Solution Approach 2:
The patent applies local quality by assigning specific comb offset values to specific TRPs and transmission occasions. Each TRP-getting UE receives locally optimized frequency domain resources tailored to its specific transmission context, ensuring accurate channel quality assessment for each connection while maintaining efficient global resource utilization through coordinated allocation.
Data Source
AI summary
Some aspects of this disclosure relate to apparatuses and methods for implementing mechanisms for reducing interferences for Sounding Reference Signal (SRS) by, for example, one or more of frequency domain interference randomization, code domain interference randomization, or power control. For example, a user equipment (UE) can be configured to determine a comb offset and/or a cyclic shift for each Sounding Reference Signal (SRS) transmission occasion for the UE. The comb offset and/or the cyclic shift change between different SRS transmission occasions of the UE. The UE is further configured to transmit an SRS to the base station using the determined comb offset and/or the determined cyclic shift during the SRS transmission occasion corresponding.