Semi-Persistent SRS Path Loss Reference Configuration
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately determining the path loss for semi-persistent sounding reference signals, which affects the efficiency and accuracy of positioning in 5G networks, particularly in scenarios where rapid beam switching is required without adequate power adjustments.
Innovation Solution
The method involves a user equipment (UE) receiving a medium access control control element from a serving base station, determining a spatial relation reference for a sounding reference signal resource, and setting a path loss reference based on this reference, either from a downlink reference signal or a synchronization signal block, to adjust the transmit power for the sounding reference signal resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If semi-persistent sounding reference signals are transmitted without dynamic power adjustment, then beam switching speed is improved, but positioning accuracy deteriorates due to inadequate path loss compensation
Solution Approach 1:
The patent applies preliminary action by pre-configuring path loss reference values and spatial relation information in MAC CE messages before beam switching occurs. The UE receives and stores these parameters in advance, enabling rapid beam switching without real-time power calculation delays, while maintaining positioning accuracy through pre-determined path loss compensation values.
Solution Approach 2:
The patent implements dynamics by enabling conditional power adjustment mechanisms. The UE dynamically selects between different path loss reference values based on spatial relation configurations, allowing power levels to adapt to different beam directions and propagation conditions while maintaining the semi-persistent transmission framework that enables fast switching.
2Stability of the object's composition
If path loss reference is set to uplink reference signal, then power control consistency is improved, but positioning accuracy deteriorates due to incorrect spatial relation assumptions
Solution Approach 1:
The patent applies local quality by introducing spatial relation-specific path loss reference values. Different path loss references are assigned to different spatial relations (beam directions), allowing power control to be consistent within each spatial relation while accounting for the specific propagation characteristics of each direction, thereby maintaining both power control consistency and positioning accuracy.
Solution Approach 2:
The patent implements parameter changes by allowing the path loss reference parameter to vary based on spatial relation configurations. The network can configure different path loss reference values for different spatial relations, enabling the UE to adjust transmit power appropriately for each beam direction while maintaining consistent power control within each configured spatial relation.
3Measurement precision
If transmit power is increased for all sounding reference signal resources, then positioning accuracy is improved, but energy consumption and interference increase
Solution Approach 1:
The patent applies local quality by enabling spatially selective power adjustment. The UE determines transmit power based on spatial relation configurations and associated path loss references, allowing higher power to be used only in specific directions where needed for positioning accuracy, while maintaining lower power in other directions, thus reducing overall energy consumption and interference.
Solution Approach 2:
The patent implements partial action by applying power adjustment only to the extent necessary for each spatial relation. Instead of uniformly increasing power for all SRS resources, the UE adjusts power selectively based on the specific path loss conditions and spatial relation requirements of each beam direction, achieving sufficient positioning accuracy without excessive energy consumption.
Data Source
AI summary
Techniques are provided for determining a path loss for semi-persistent SRS-for-positioning if the path loss resource set is not updatable through a MAC CE. An example method according to the disclosure includes receiving, from a serving base station, a medium access control control element, determining a spatial relation reference of a first sounding reference signal resource, setting a path loss reference for a sounding reference signal for positioning resource set to the spatial relation reference if the spatial relation reference is not an uplink reference signal, setting the path loss reference equal to a reference system resource from a synchronization signal block the user equipment utilizes to obtain a master information block if the spatial relation reference is an uplink reference signal, and transmitting the resources of the sounding reference signal for positioning resource set based at least in part on the path loss reference.