SRS Transmission Protocol for Multi-Antenna Channel Estimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems, particularly in 5G and NR technologies, face challenges in efficiently managing sounding reference signals (SRS) across multiple antennas and subcarriers, leading to suboptimal channel estimation and resource allocation, especially in scenarios with high inter-cell interference and varying UE capabilities.
Innovation Solution
The proposed solution involves transmitting SRSs via different antennas using multiple transmit chains, with specific protocols for single and dual transmitter UEs, allowing for simultaneous or staggered SRS transmission across multiple antennas within a slot, and employing power management techniques to account for antenna-specific losses, thereby enhancing channel estimation and resource allocation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS transmissions are performed across multiple antennas using multiple transmit chains, then channel estimation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the SRS transmission process by dividing it into multiple slots, where different antenna ports are activated in different slots. This allows the UE to sound multiple antennas over time rather than simultaneously, reducing the instantaneous complexity of the transmit chains while maintaining comprehensive channel estimation capability across all antennas.
2Productivity
If SRS transmissions are performed across multiple antennas within a slot, then resource allocation efficiency is improved, but interference from other signals increases
Solution Approach 1:
The patent implements periodic SRS transmissions where different antenna ports are activated in alternating slots. This periodic pattern allows the system to achieve comprehensive channel sounding across multiple antennas while distributing the transmission instances over time, thereby reducing peak interference levels and improving coexistence with other signals.
3Reliability
If power management techniques account for antenna-specific losses, then transmission reliability is improved, but control complexity increases
Solution Approach 1:
The patent introduces antenna-specific power management parameters that are configured by the network and applied by the UE. These parameters allow each antenna port to have customized power control settings that account for antenna-specific losses, thereby improving transmission reliability without requiring complex real-time calculations at the UE side, as the control logic is simplified through pre-configured parameters.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Certain aspects of the present disclosure relate to methods and apparatus for wireless communication. In certain aspects, the method generally includes determine a transmission power for each of at least one first sounding reference signal (SRS) to be transmitted using at least one first antenna, wherein the determination is based on whether the at least one first SRS is transmitted using an amplifier of a transmit chain configured for transmissions using a second antenna, and transmitting the at least one first SRS based on the determination.