Default Spatial Filter Selection for 5G Uplink Beam Switching
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing beam operations and beam switching in multi-beam environments, particularly in 4G and 5G communication systems, leading to suboptimal performance and resource inefficiencies.
Innovation Solution
The implementation of a mechanism for determining a default spatial filter in wireless devices and base stations, which includes configuring and updating TCI states and pathloss reference signals (PL-RS) based on specific criteria, such as traffic load and device capabilities, to optimize beam management and switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-beam operation is implemented to improve system capacity and coverage, then network performance is enhanced, but beam management complexity and resource overhead increase
Solution Approach 1:
The patent applies universality by making the spatial filter determination mechanism applicable across multiple beam scenarios and network configurations. The default spatial filter is determined based on universal criteria that work across different beam management contexts, allowing the same mechanism to serve multiple functions in multi-beam operations.
Solution Approach 2:
The patent implements self-service by enabling the wireless device to autonomously determine its default spatial filter without requiring explicit network configuration or intervention. The device uses its own capabilities and local measurements to select the appropriate spatial filter, reducing the management overhead on the network side.
2Reliability
If beam switching is performed frequently to adapt to mobile devices, then communication quality is maintained, but latency and resource overhead increase
Solution Approach 1:
The patent applies preliminary action by pre-determining the default spatial filter before beam switching is needed. The device establishes a default spatial filter in advance based on its capabilities and initial measurements, so that when beam switching occurs, the device can quickly apply the pre-determined filter without extensive computation or network coordination, thereby reducing switching latency.
3Productivity
If spatial filter configuration is optimized for specific device capabilities, then beam management efficiency is improved, but system adaptability to different devices decreases
Solution Approach 1:
The patent applies parameter changes by adjusting the spatial filter determination based on device-specific parameters such as antenna configuration and capability indicators. The device uses its own capability parameters to determine the appropriate default spatial filter, allowing optimization for each device type while maintaining a unified determination mechanism that adapts to different capabilities.
Data Source
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Figure 3
AI summary
A wireless device may determine, after receiving an association between an uplink transmission configuration indicator (TCI) state and a pathloss reference signal (PL-RS) and before receiving an activation command for the uplink TCI state, to use a synchronization signal block (SSB) as a first PL-RS for transmission of an uplink signal. The wireless device may transmit the uplink signal with a transmit power determined based on the first PL-RS until receiving the activation command.