SRS Frequency-Domain Indexing for Lower NR Signaling Overhead

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Solution Overview

Problem

In multiple short sequence based SRS, the overhead for signaling CS index information is high, which affects the efficiency of orthogonalization and channel quality estimation in NR communication systems.

Innovation Solution

A terminal and base station configuration that specifies a frequency domain for transmitting reference signals with phase shift indexes, reducing the need for explicit CS index signaling by associating CS indexes with frequency resource units and using methods like random or patterned CS index calculations to minimize overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple short sequence based SRS is used to transmit SRS in discontinuous bands, then flexibility in performing SRS frequency scheduling is improved, but overhead for supplying CS index information increases

Engineering Contradiction:

Improveflexibility in performing SRS frequency schedulingVSAvoidoverhead for supplying CS index information

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The terminal autonomously determines the CS index by calculating it from the frequency domain information and sequence data, eliminating the need for the base station to explicitly signal the CS index. This self-determination mechanism reduces signaling overhead while maintaining the flexibility of multiple partial band transmission

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Frequency domain information serves as an intermediary that links the sequence data to the appropriate CS index. The terminal uses the frequency domain position to determine which CS index to apply, creating an indirect relationship that reduces explicit signaling requirements

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If CS index information is explicitly signaled for each partial band, then orthogonalization of SRSs from multiple terminals is improved, but signaling overhead increases

Engineering Contradiction:

Improveorthogonalization of SRSsVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The system changes the parameter determination method from explicit signaling to calculated determination. The CS index is derived from frequency domain parameters and sequence data through a deterministic relationship, ensuring orthogonalization is maintained while reducing signaling overhead

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The frequency domain information serves multiple functions: it identifies the partial band location and simultaneously determines the appropriate CS index. This multi-functionality eliminates the need for separate CS index signaling while maintaining orthogonalization

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP3567817B1Terminal, base station, and communication method

Publication Date: 2026.02.18 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

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AI summary

In the multiple short sequence based SRS, multiple items of sequence data having a short sequence length corresponding to a partial band are used for transmitting SRS in discontinuous bands. In the multiple short sequence based SRS, a terminal specifies a frequency domain to be used for transmitting a reference signal using predetermined sequence data, applies a phase shift index associated with the specified frequency domain to the reference signal, and transmits the reference signal to which the phase shift index is applied by using the specified frequency domain.