Sounding Reference Signal Configurations for Transmit Chain Adaptability
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently configuring codebook-based sounding reference signals and precoding matrix indicators, particularly in supporting multiple transmit chains on a single or multiple component carriers, which affects performance, throughput, and thermal costs.
Innovation Solution
The system configures different sounding reference signal resources for varying numbers of transmit chains, using a precoding matrix indicator to determine the appropriate number of chains for transmission, allowing for flexible switching between two and three transmit chains on different carriers to optimize performance and reduce thermal costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the system configures different sounding reference signal resources for varying numbers of transmit chains, then the adaptability to different transmit chain configurations is improved, but the device complexity increases
Solution Approach 1:
The patent segments the sounding reference signal resources into different configurations (2-port SRS resources and 4-port SRS resources) that can be independently configured and activated. This allows the system to divide the overall SRS resource pool into manageable segments that correspond to different transmit chain scenarios, making the complex configuration more tractable while maintaining adaptability across different transmit chain numbers
Solution Approach 2:
The patent implements dynamic switching between different SRS resource configurations based on the actual number of transmit chains available. The system can dynamically select between 2-port and 4-port SRS resources depending on whether 2 or 3 transmit chains are being used, allowing the configuration to adapt in real-time to changing operational conditions without requiring static preconfiguration for all scenarios
2Productivity
If the base station configures codebook based SRS configurations for different numbers of transmit chains on different carriers, then the productivity and throughput are improved, but the loss of information increases due to more complex configuration signaling
Solution Approach 1:
The patent creates a universal SRS resource configuration framework where the same base station can manage multiple SRS resource types (2-port and 4-port) that serve multiple functions. The configuration signaling establishes a universal template that works across different carriers and transmit chain scenarios, reducing the need for separate specialized configurations and thereby minimizing information loss while maintaining high throughput capability
3Power
If the UE uses more transmit chains for transmission, then the power and throughput are improved, but the thermal cost increases
Solution Approach 1:
The patent changes the operational parameters by dynamically adjusting the number of active transmit chains based on channel conditions and traffic requirements. Instead of always using the maximum number of transmit chains (which would maximize power but also maximize thermal cost), the system selectively activates 2 or 3 transmit chains as needed, thereby optimizing the balance between transmission power and thermal generation. The SRS configuration supports this by providing appropriate reference signal resources for different transmit chain counts
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, a user equipment (UE) may communicate on first and second carriers, and may support either two transmit chains or three transmit chains on a second carrier. A base station may configure different sounding reference signal (SRS) resources for different numbers of transmit chains. SRS resources configured with two ports may indicate two transmit chains, and SRS resource configured with three ports may indicate three transmit chains. The base station may indicate an index associated with an SRS resource, and the UE may select (e.g., based on a mapping between the SRS Configuration Information resource index and a number of SRS ports and a number of transmit chains), a corresponding SRS resource, number of ports, number of transmit chains, or any combination thereof. The base station may indicate a number of transmit chains for a given SRS resource based on a PMI index.