Reducing Path Loss Reference Signal Application Time
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Solution Overview
Problem
Current wireless communication systems, such as 5G NR and LTE, face challenges in reducing the application time for path loss reference signals (PL RS) used for uplink power control, leading to delayed power control parameter application and potential communication failures due to outdated parameters.
Innovation Solution
The method involves reducing the application time for PL RS measurements by transmitting PL RS with shorter periodicity or using a smaller number of samples for uplink power control, allowing earlier application of power control parameters, which can be determined based on mobility and measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the application time for PL RS measurements is reduced, then the uplink power control parameters can be applied earlier improving communication efficiency, but the measurement accuracy may deteriorate due to fewer samples available for averaging
Solution Approach 1:
The system performs preliminary configuration of multiple PL RS resources and measurement parameters in advance. When early application is needed, the UE can immediately use the pre-configured resources without waiting for new configuration, thus reducing application time while maintaining measurement accuracy through pre-planned multiple sample points
Solution Approach 2:
The network can dynamically change measurement parameters such as the number of samples to average, the measurement bandwidth, and the PL RS resource selection based on UE mobility state and channel conditions. For stationary UEs, fewer samples may suffice, enabling reduced application time, while for mobile UEs, more samples are used to maintain accuracy
2Loss of time
If PL RS are transmitted with shorter periodicity to enable faster measurements, then the application time is reduced, but the signaling overhead and system resource consumption increase
Solution Approach 1:
The PL RS periodicity is made dynamic rather than fixed. The network configures different periodicities based on UE mobility state, channel conditions, and service requirements. For UEs that can tolerate longer application times or have stable channels, longer periodicity reduces resource consumption, while for UEs requiring fast adaptation, shorter periodicity is applied selectively
Solution Approach 2:
Different PL RS resources with different periodicities are allocated to different UEs or different time/frequency regions based on local requirements. This allows the system to optimize resource consumption by applying short periodicity only where fast power control is critical, while using longer periodicity elsewhere to conserve resources
3Productivity
If the number of PL RS samples used for power control is reduced, then the application time is reduced and latency is lowered, but the reliability of power control deteriorates due to increased measurement variance
Solution Approach 1:
The measurement process is segmented into multiple independent PL RS resource measurements that can be combined. Instead of requiring many samples from a single resource, the system uses measurements from multiple segmented resources, each contributing to the final power control parameter. This reduces the time needed while maintaining reliability through diversity
Solution Approach 2:
Filtering and interpolation functions act as intermediaries between raw PL RS measurements and the final power control parameters. These intermediaries process a smaller number of measurements to produce reliable power control values, reducing the need for extensive sampling while maintaining reliability
Data Source
AI summary
Aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for reducing path loss reference signal (PL RS) application time. An example method generally includes receiving signaling indicating activation of path loss (PL) reference signals (RSs), determining that the UE can reduce an application time for using the PL RS for uplink power control purposes, wherein the reduced application time is reduced relative to a non-reduced application time, and using PL RS measurements taken according to the reduced application time for uplink power control.