Uplink Path-Loss Tracking for Timely 5G Power Compensation
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Solution Overview
Problem
Current methods for tracking reference signal path losses in uplink transmissions in 5G wireless communication networks experience significant mismatches between updated spatial relations and path-loss RS indications, leading to incorrect power compensation and degraded UL signal quality due to high-frequency propagation losses and limited UE capabilities in maintaining path-loss RSs.
Innovation Solution
Implement mechanisms for the UE to pre-track multiple path-loss RSs and apply priority rules for selecting RSs to be maintained, and for the BS to transmit reference signals for path-loss measurement with associated commands, ensuring timely and accurate power compensation during uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE waits for path-loss RS measurements to complete before applying updated spatial relation and path-loss RS, then the measurement accuracy is improved, but the timing mismatch between spatial relation update and path-loss RS update increases
Solution Approach 1:
The patent applies preliminary action by having the UE pre-track multiple path-loss reference signals before the actual update is needed. The UE maintains path-loss estimates for multiple RSs in advance, so when a spatial relation update occurs, the corresponding path-loss estimate is already ready or can be quickly retrieved, eliminating the need to wait for measurements to complete and reducing timing mismatch.
Solution Approach 2:
The patent segments the path-loss tracking process by allowing the UE to maintain separate path-loss estimates for multiple different reference signals simultaneously. This segmentation enables independent tracking of path-loss for different RSs, so that when one RS is selected for spatial relation update, its path-loss estimate is already prepared without blocking other measurements.
2Measurement precision
If the UE tracks multiple path-loss RSs, then the path-loss estimation accuracy is improved, but the UE complexity increases
Solution Approach 1:
The patent applies preliminary action by configuring the UE to pre-track multiple path-loss reference signals in advance based on downlink reference signal measurements. The UE maintains path-loss estimates for multiple RSs proactively, so when updates are needed, the data is already prepared. This preliminary tracking reduces the need for complex real-time decision-making during updates.
Solution Approach 2:
The patent implements feedback mechanisms where the UE reports measured path-loss values for multiple reference signals back to the network. The network uses this feedback information to make informed decisions about which RS to select for spatial relation updates, reducing the complexity of UE processing by providing clear guidance on expected behavior.
3Productivity
If the network updates spatial relation and path-loss RS through the same PDSCH, then the resource efficiency is improved, but the closed loop UL transmission accuracy is degraded
Solution Approach 1:
The patent segments the update process by allowing spatial relation updates and path-loss RS updates to be handled separately. The UE maintains separate processing paths for spatial relation information and path-loss estimates, enabling independent control and timing of each update type. This segmentation prevents the resource efficiency benefits of combined updates from compromising transmission accuracy.
Solution Approach 2:
The patent applies preliminary action by having the UE prepare and maintain path-loss estimates in advance, so that when spatial relation updates occur, the path-loss information is already ready. This eliminates the need for coordinated timing between spatial relation and path-loss updates, allowing them to be processed independently through the same PDSCH without affecting accuracy.
Data Source
AI summary
Methods and systems for controlling a transmit power of a wireless communication device are disclosed herein. In one embodiment, a method includes: determining one or more reference signals transmitted by a wireless communication node; maintaining one or more path loss estimates for the one or more reference signals; associating at least one path loss estimate with an uplink (UL) signal; calculating a transmission power of the UL signal according to the at least one path loss estimate; and transmitting the UL signal in accordance with the calculated transmission power.