Multi-TRP SRS Time Patterns for TDD Channel Estimation
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Solution Overview
Problem
Existing 5G New Radio (NR) systems face challenges in efficiently utilizing sounding reference signals (SRS) for channel estimation and precoding in time division duplex (TDD) scenarios, particularly in multiple transmission and reception point (mTRP) configurations, where optimal transmission timing and power control are not adequately addressed.
Innovation Solution
A wireless transmit/receive unit (WTRU) is configured to receive configuration information for SRS resource sets, time-based patterns, and pathloss reference signals (PL RS), allowing for dynamic transmission of SRS with varying cyclic shifts and power control based on activated time-based patterns, indicated through downlink control information or MAC control elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS transmission is performed in mTRP scenarios without time-based patterns, then transmission simplicity is maintained, but channel estimation accuracy and system performance deteriorate
Solution Approach 1:
The patent implements dynamic SRS transmission by introducing time-based patterns that can be activated or deactivated based on channel conditions and traffic requirements. The WTRU dynamically selects transmission timing and parameters according to activated patterns, making the system adaptable to varying channel states while maintaining manageable complexity through pattern-based control
Solution Approach 2:
The patent changes transmission parameters including cyclic shift values, time instances, and power levels based on activated time-based patterns. Different patterns correspond to different parameter sets, allowing the system to optimize channel estimation accuracy by selecting appropriate parameter combinations for different transmission scenarios without requiring complex real-time calculations
2Productivity
If multiple SRS resources are transmitted simultaneously without time-based patterns, then resource utilization increases, but interference between transmissions increases
Solution Approach 1:
The patent employs periodic time-based patterns that dictate when SRS transmissions occur. By activating specific patterns that space transmissions in time, the system allows multiple SRS resources to be utilized efficiently while preventing interference through temporal separation. The periodic nature of pattern activation ensures structured transmission timing
Solution Approach 2:
The patent segments the SRS transmission resources by associating different time-based patterns with different SRS resources and TRPs. Each activated pattern governs a specific subset of transmissions, dividing the overall transmission space into manageable segments that can be controlled independently, thereby reducing interference while maintaining high resource utilization
3Measurement precision
If power control is not optimized based on time-based patterns, then transmission power management is simplified, but channel estimation precision and link reliability deteriorate
Solution Approach 1:
The patent adjusts transmit power as a parameter controlled by activated time-based patterns. Different patterns associate with different power levels or power control configurations, allowing the system to optimize channel estimation precision by transmitting with appropriate power for each pattern scenario. The WTRU determines power based on the activated pattern without requiring complex real-time power optimization algorithms
Solution Approach 2:
The patent implements feedback mechanisms where the gNB provides indications to activate or deactivate specific time-based patterns based on observed channel conditions and performance. This feedback loop allows the system to adapt power control settings dynamically, improving channel estimation precision while keeping power control complexity manageable through network-directed pattern activation rather than autonomous complex power optimization
Data Source
AI summary
A method and a wireless transmit/receive unit (WTRU) for multiple transmission and reception point (mTRP) transmission may comprise a WTRU configured to receive configuration information indicating a sounding reference signal (SRS) resource set that includes at least one or more SRS resources, one or more SRS parameters, and one or more time-based patterns. The WTRU may be configured to receive an indication to activate a time-based pattern of the one or more time-based patterns. The WTRU may be configured to transmit a first SRS in a first time instance using a first SRS resource of the one or more SRS resources and a first SRS parameter of the one or more SRS parameters. The WTRU may be configured to transmit a second SRS in a second time instance that is different than the first time instance using the first SRS resource and a second SRS parameter.