Uplink Reference Signal Power Control for Interference Management
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Solution Overview
Problem
Massive MIMO systems face challenges in managing interference variations rapidly over time and frequency, leading to cumbersome channel estimation and feedback mechanisms, especially due to 'flashlight' interference which cannot be measured at network nodes, increasing overhead and affecting downlink performance.
Innovation Solution
A method where wireless devices determine interference level indications on multiple frequency resources and adjust uplink reference signal transmission powers based on these indications, allowing network nodes to schedule downlink transmissions efficiently without explicit CSI/CQI feedback, thereby reducing overhead and improving channel estimation for favorable resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback mechanisms are used to report interference levels at different subcarriers, then interference management is improved, but feedback load and overhead increase
Solution Approach 1:
The wireless device autonomously determines interference levels and adjusts its uplink reference signal transmission power accordingly, without requiring explicit feedback requests or reports to the network node. This self-service approach reduces feedback overhead while maintaining effective interference management
Solution Approach 2:
The wireless device changes the transmission power parameter of uplink reference signals based on determined interference levels. By modulating the reference signal power rather than reporting interference measurements, the system conveys interference information implicitly, reducing feedback load
2Productivity
If channel estimation and feedback mechanisms are performed at substantial time/frequency scales, then data rate adaptation is improved, but system complexity increases
Solution Approach 1:
The wireless device automatically adapts its reference signal transmission power based on locally determined interference conditions, eliminating the need for complex network-coordinated channel estimation and feedback procedures. This maintains data rate adaptation capability while reducing system complexity
Solution Approach 2:
The wireless device performs preliminary interference level determination and adjusts reference signal power before data transmission occurs. This preliminary action enables the network node to allocate resources efficiently without requiring complex real-time feedback mechanisms
Data Source
AI summary
A wireless device, a network node and respective methods performed thereby for communicating with each other are provided. The method performed by the wireless device comprises determining (120) a first interference level indication of a first frequency resource; and determining (125) a second interference level indication of a second frequency resource. The method (100) further comprises transmitting (130) a first uplink reference signal on the first frequency resource with a first transmission power, and transmitting (135) a second uplink reference signal on the second frequency resource with a second transmission power, wherein the first transmission power is based on the first- and second interference level indications.