8-Port SRS Resource Configuration for Uplink Capacity

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Solution Overview

Problem

Current NR specifications only support uplink transmission for UEs with up to 4 transmit chains, limiting the capacity and performance of SRS for UEs with more transmit chains.

Innovation Solution

The proposed solution extends the SRS design to support UEs with up to 8 transmit chains by introducing a new mapping of SRS ports to comb offsets and cyclic shifts, allowing for more efficient transmission and increased capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If current NR specifications are used, then UEs with up to 4 transmit chains are supported, but the capacity and performance of SRS for UEs with more transmit chains is limited

Engineering Contradiction:

Improvesupport for UEs with more transmit chainsVSAvoidcapacity of SRS

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent segments the SRS transmission by dividing 6 or 8 SRS ports into multiple subsets, where each subset is mapped to different comb offsets and cyclic shifts. This allows the system to handle more transmit chains by breaking down the complex multi-port transmission into manageable segments that can be independently processed and transmitted.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces new dimensions for SRS port mapping by utilizing comb offsets and cyclic shifts as additional degrees of freedom. Instead of being limited to the traditional 4-port configuration, the system now maps SRS ports across multiple comb offsets (e.g., comb 2, comb 4) and cyclic shift values, effectively expanding the capacity from 4 transmit chains to support 6 or 8 transmit chains.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If SRS ports are mapped using traditional methods, then up to 4 transmit chains are supported, but transmission efficiency for 6 or 8 transmit chains is reduced

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidmapping complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent changes key parameters of the SRS mapping scheme by introducing new relationships between SRS ports, comb offsets, and cyclic shifts. Specifically, it defines new mapping rules where SRS ports are systematically assigned to different comb offsets and cyclic shift values, enabling 6 or 8-port configurations while maintaining orthogonality and transmission efficiency.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies different mapping characteristics to different subsets of SRS ports. Each subset is assigned specific comb offsets and cyclic shifts tailored to its requirements, allowing optimized transmission for each group while collectively supporting the full 6 or 8-port configuration. This localized optimization improves overall transmission efficiency.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20250125927A1Sounding reference signals for eight transmitter ue

Publication Date: 2025.04.17 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

According to some embodiments, a method performed by a wireless device comprises obtaining a sounding reference signal (SRS) resource configuration for 6 or 8 SRS ports and transmitting SRS according to the SRS resource configuration. In particular embodiments, the SRS resource configuration comprises an SRS resource for 6 or 8 SRS ports wherein the SRS resource is divided into at least two subsets, wherein each subset is associated with a different comb offset. In particular embodiments, the SRS resource configuration comprises two SRS resources. Each SRS resource supports up to 4 SRS ports. Transmitting SRS according to the SRS configuration comprises transmitting SRS using an 8 port codebook.