SRS Resource Expansion Beyond Four Layers for Non-Codebook Uplink
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Solution Overview
Problem
Current wireless communication systems are limited to supporting fewer than 4 layers for non-codebook based uplink transmission, which restricts the uplink data rate and fails to meet the increasing demand for higher data rates.
Innovation Solution
Configuring more than 4 SRS resources for non-codebook based uplink transmission, allowing each SRS resource to be configured with one port, and enabling the UE to transmit SRSs on these resources using different precoders, thereby supporting up to 8 layers of simultaneous data streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the system is configured to support non-codebook based uplink transmission with traditional SRS resource limits, then compatibility with existing standards is maintained, but the uplink data rate is restricted and cannot meet increasing demand for higher data rates
Solution Approach 1:
The patent changes the parameter of SRS resource configuration by introducing a new parameter 'nrofSRS-Resources' that can be set to values greater than 4, enabling support for more than 4 layers in non-codebook based uplink transmission. This parameter modification allows the system to achieve higher uplink data rates while maintaining compatibility with existing standards through proper configuration signaling.
2Productivity
If more than 4 SRS resources are configured for non-codebook based uplink transmission, then higher uplink data rates and more data streams are supported, but the complexity of resource configuration and management increases
Solution Approach 1:
The patent segments the SRS resource configuration into manageable components by introducing structured parameters including 'nrofSRS-Resources' to define the total number of resources, 'srs-ResourceIndicator' to identify specific resources, and associating each SRS resource with specific ports. This segmentation allows the system to handle complex configurations systematically while supporting more than 4 layers.
Solution Approach 2:
The patent implements dynamic SRS resource configuration where the number of SRS resources can be flexibly adjusted through RRC signaling parameters. The system can dynamically allocate and reconfigure SRS resources based on channel conditions and transmission requirements, allowing adaptive optimization of uplink performance without fixed constraints.
3Measurement precision
If each SRS resource is configured with one port for multi-layer transmission, then precise channel estimation and precoding are enabled, but the signaling overhead and configuration complexity increase
Solution Approach 1:
The patent makes the SRS resource configuration universal by designing a flexible parameter structure that can accommodate different numbers of layers and port configurations through the 'nrofSRS-Resources' parameter. The same configuration framework supports both traditional 4-layer and extended multi-layer scenarios, reducing the need for multiple specialized configuration sets and thereby reducing signaling overhead.
Data Source
AI summary
The present disclosure relates to SRS enhancement to support more than four layers non-codebook based uplink transmission. In an aspect, a wireless device may comprise at least one antenna; at least one radio coupled to the at least one antenna; and a processor coupled to the at least one radio; wherein the processor is configured to: receive, via the at least one radio, at least one Radio Resource Control (RRC) signaling from a cellular base station, wherein, the at least one RRC signaling configures at least one group of N Sounding Reference Signal (SRS) resources for non-codebook, N>4, and each SRS resource is configured with one port; and transmit, via the at least one radio, SRSs to the cellular base station on the configured group of SRS resources, wherein each SRS is transmitted on one SRS resource of the configured group of SRS resources.