SRS Comb Offset Hopping for Multi-TRP Interference Randomization
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Solution Overview
Problem
Interference between Sounding Reference Signal (SRS) transmissions from multiple UEs to multiple base stations or TRPs hinders accurate channel quality determination, as existing systems fail to dynamically adjust transmission parameters.
Innovation Solution
Implementing frequency domain and code domain interference randomization through comb offset and cyclic shift hopping, along with power control mechanisms, to dynamically adjust SRS transmission parameters for each occasion, reducing persistent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple UEs transmit SRS simultaneously to base stations, then channel quality measurement capability is improved, but interference between SRS transmissions increases
Solution Approach 1:
The patent applies dynamics by making the comb offset configurable and changeable based on transmission occasion. The comb offset is determined dynamically using formulas that incorporate transmission occasion index, allowing the frequency domain resources to shift adaptively across different SRS transmissions, thereby reducing persistent interference patterns while maintaining measurement capability
Solution Approach 2:
The patent segments the frequency domain resources by introducing comb structures with different comb offsets. Instead of all UEs using the same frequency resources, the available bandwidth is divided into multiple comb patterns (e.g., comb-2, comb-4, comb-8) with different offsets, allowing multiple UEs to transmit SRS simultaneously on orthogonal frequency resources, thus reducing interference while maintaining measurement capability
2Object-affected harmful factors
If comb offset is changed for each SRS transmission occasion, then interference randomization is improved, but computational complexity increases
Solution Approach 1:
The patent applies self-service by enabling the UE to autonomously determine its own comb offset using predefined formulas and parameters provided by the base station. The UE independently calculates the comb offset based on transmission occasion index, RRC configured parameters, and cell ID, without requiring complex network coordination or additional signaling overhead, thus achieving interference randomization with minimal computational burden
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.