SRS Resource Group Beam Configuration in NR Uplink
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Solution Overview
Problem
In new radio access technology (NR) systems, there is a lack of defined methods to inform user equipment (UE) transmission beams for uplink sounding reference signal (SRS) transmission in SRS resource groups containing multiple SRS resources, affecting efficient SRS transmission.
Innovation Solution
The method involves receiving SRS resource indicators, channel state information reference signals, synchronization signal blocks, and uplink transmission configuration indicators from a base station to determine whether to use the same or different transmission beams for SRS transmission in an SRS resource group, allowing the UE to transmit SRS based on indicated beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple SRS resources are configured in an SRS resource group, then SRS transmission flexibility and coverage are improved, but the complexity of beam management and resource configuration increases
Solution Approach 1:
The SRS resource group is segmented into multiple individual SRS resources, each associated with specific beam information. This segmentation allows the UE to selectively apply beam configurations to different resources, managing complexity through structured division while maintaining flexibility in resource utilization.
Solution Approach 2:
Beam information is pre-configured and associated with SRS resources before actual SRS transmission occurs. The UE receives and stores beam information in advance, which simplifies the transmission process by eliminating real-time beam selection complexity while maintaining adaptability across multiple resources.
2Reliability
If beam information is provided for each SRS resource, then SRS transmission precision and reliability are improved, but the signaling overhead and configuration complexity increase
Solution Approach 1:
The beam information configuration mechanism is designed to serve multiple functions: it provides precise beam direction for reliable SRS transmission, enables resource grouping management, and supports both individual and group-level beam applications. This multi-functionality reduces the need for separate signaling mechanisms, thereby reducing overall overhead while maintaining reliability.
Solution Approach 2:
Beam information can be copied and applied across multiple SRS resources within a group. Instead of transmitting unique beam information for each resource, the same beam information is referenced and applied to multiple resources, significantly reducing signaling overhead while maintaining transmission reliability through consistent beam usage.
3Productivity
If SRS resources are grouped together, then resource management efficiency is improved, but the difficulty of beam differentiation and resource allocation increases
Solution Approach 1:
Each SRS resource within the group is assigned specific local beam information characteristics, allowing differentiation at the resource level while maintaining group management efficiency. The UE can identify and apply appropriate beam information for each resource based on its specific configuration, enabling precise beam differentiation without compromising overall resource management efficiency.
Data Source
AI summary
A method for transmitting an SRS by a terminal may comprise the steps of: receiving, from a base station, one of an SRS resource indicator (SRI), a CSI-RS resource indicator (CRI), a synchronization signal block (SSB) identifier, and an uplink transmission configuration indicator (TCI); on the basis of whether the received indicator/identifier includes an indication that the corresponding indicator/identifier is commonly used for an SRS resource group or an indication that the corresponding indicator/identifier is used for a first SRS resource of the SRS resource group, determining whether to use the same transmission beam or use different transmission beams to transmit an SRS in the SRS resource group; on the basis of the determination, determining a transmission beam for the terminal, indicated by the received indicator/identifier; and transmitting the SRS in the first SRS resource on the basis of the transmission beam for the terminal, wherein the SRS resource group includes the first SRS resource and a second SRS resource. The UE is capable of communicating with at least one of another UE, a UE related to an autonomous driving vehicle, a base station or a network.