SRS Resource Configuration for Multi-Antenna UE
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Solution Overview
Problem
User equipment (UE) with more antennas than transmit chains faces challenges in concurrently transmitting sounding reference signals (SRS) on multiple SRS resources due to the limited number of transmit chains, leading to unsupported combinations of SRS resources and inaccurate channel sounding.
Innovation Solution
The UE reports information to the base station about supported and unsupported SRS resource combinations, allowing the base station to configure SRS resources and select compatible SRS resources for the UE, enabling concurrent SRS transmission on supported resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE uses more antennas than transmit chains for SRS transmission, then the channel sounding accuracy is improved, but the UE cannot concurrently transmit SRS on multiple SRS resources due to limited transmit chains
Solution Approach 1:
The UE performs preliminary actions by reporting its antenna and transmit chain configuration to the base station before SRS transmission. The base station uses this information to pre-determine supported SRS resource combinations and configure appropriate SRS resources, avoiding runtime conflicts and enabling accurate channel sounding within hardware constraints.
Solution Approach 2:
The system dynamically adapts the SRS resource configuration based on the UE's reported capabilities. The base station selects SRS resource combinations that are supported by the UE's transmit chains, allowing flexible adjustment of the number of concurrent SRS transmissions to match the UE's dynamic hardware state.
2Productivity
If the base station configures SRS resources without considering UE transmit chain limitations, then the SRS resource utilization is improved, but the UE cannot transmit on unsupported combinations leading to scheduling failures
Solution Approach 1:
The UE provides feedback to the base station about its antenna and transmit chain configuration. The base station uses this feedback to determine which SRS resource combinations are supported and configures only those resources, ensuring both high utilization and reliable transmission by matching configuration to actual UE capabilities.
Solution Approach 2:
The base station changes the configuration parameters of SRS resources based on the UE's reported capabilities. By adjusting the number and combination of SRS resources to match the UE's transmit chain availability, the system achieves optimal resource utilization while maintaining transmission reliability.
3Adaptability or versatility
If the UE reports detailed antenna and transmit chain information to the base station, then the base station can optimize SRS resource configuration, but the signaling overhead increases
Solution Approach 1:
The reported antenna and transmit chain information serves multiple functions: it enables the base station to determine supported SRS resource combinations, assess concurrent transmission capabilities, and optimize resource configuration. This multi-functional use of the reported information maximizes the value of the signaling exchange while minimizing overhead.
Data Source
AI summary
A user equipment (UE) sends an indication supported combinations of sounding reference signal (SRS) resources, unsupported combinations of SRS resources, or compatible SRS resources to a base station. The base station selects one or more SRS resources for the UE from the SRS resources that are supported by the UE or are compatible for the UE. In some examples, the UE receives a configuration from the base station for multiple SRS resource sets. After configuring the UE with multiple SRS resource sets, the base station selects one of the SRS resources sets, and may indicate the selected SRS resource set to the UE. The UE transmits a physical uplink shared channel (PUSCH) to the base station using SRS resources from the selected SRS resource set.