UE SRS Transmission Control via Radio Quality Thresholds
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Solution Overview
Problem
In wireless communication networks, especially in heterogeneous deployments with high-frequency and urban propagation challenges, the increased demand for SRS capacity leads to limitations and signaling overhead, particularly in dense networks with high-speed mobiles, where efficient SRS transmission is crucial for channel estimation and handover management.
Innovation Solution
A User Equipment (UE) method and system that dynamically receive transmissions from network nodes, measure radio quality indicators, and compare them to threshold values to autonomously decide when to transmit or refrain from transmitting SRSs, optimizing transmission patterns based on radio resource features and coordination needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If more network nodes are deployed to increase capacity and coverage, then coverage and capacity are improved, but network complexity and deployment difficulty increase
Solution Approach 1:
The patent segments the network into heterogeneous nodes with different power levels (macro RBS and low-power RBS) and assigns different roles to each. Macro RBS handles downlink transmission while low-power RBS handles uplink transmission, dividing the network function to manage complexity while maintaining capacity.
Solution Approach 2:
The patent makes the UE capable of performing multiple functions: measuring downlink signal strength from macro RBS, measuring uplink channel quality by transmitting SRS to low-power RBS, and autonomously deciding when SRS transmission is needed. This multi-functionality at the UE level simplifies network management.
2Measurement precision
If SRS transmission is increased to support more UEs and applications, then channel estimation and scheduling accuracy are improved, but SRS capacity is exceeded and signaling overhead increases
Solution Approach 1:
The patent introduces dynamic SRS transmission control where the UE autonomously decides whether to transmit SRS based on real-time measurement of downlink signal strength and uplink channel quality. The UE transmits SRS only when needed (e.g., when uplink channel quality is poor or changing), rather than continuously or according to fixed schedules, thereby adapting SRS usage to actual network conditions.
Solution Approach 2:
The UE performs self-assessment by measuring downlink signal strength from macro RBS and uplink channel quality through SRS transmission to low-power RBS. Based on these self-measured parameters, the UE autonomously determines whether to transmit SRS, eliminating the need for continuous network control and reducing overall SRS demand on the network.
3Measurement precision
If SRS transmission is frequent to ensure accurate channel estimation, then scheduling accuracy is improved, but signaling overhead and time delay increase
Solution Approach 1:
The patent makes SRS transmission frequency dynamic rather than fixed. The UE measures downlink signal strength and uplink channel quality in real-time, and only transmits SRS when conditions require it (e.g., when channel quality deteriorates or changes significantly). This dynamic approach ensures accurate channel estimation when needed while minimizing unnecessary measurements and reporting delays.
Data Source
AI summary
A User Equipment, UE, operable to be used in a wireless communication network and a method performed by the UE for transmitting Sounding Reference Signals, SRSs are provided. The method comprises receiving (110) at least one transmission from at least one network node, and measuring (120) at least one radio quality indicator based on the received at least one transmission. The method further comprises comparing (130) the at least one measured radio quality indicator to at least a first threshold value; and transmitting, or refraining from transmitting, (140) SRSs based on a result of the comparison.