Donor Selection via Reference Signal Boosting
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Solution Overview
Problem
Relay wireless devices face challenges in determining a preferred donor access node with limited resources or unclear quality characteristics, affecting their ability to provide high-quality service to end-user devices.
Innovation Solution
A method and system for donor selection in relay access nodes, which involves identifying candidate donor access nodes, evaluating their characteristics, and selecting a primary donor based on quality metrics, with enhanced reference signal power to improve channel estimation and connection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If relay wireless devices use limited resources from donor access nodes, then service coverage can be extended to edge areas, but service quality deteriorates due to resource constraints
Solution Approach 1:
The patent changes the transmission power parameter of reference signals to a higher level than downlink information. This allows relay devices to accurately evaluate channel quality and select optimal donor access nodes, thereby maintaining service quality while extending coverage to edge areas.
Solution Approach 2:
The patent implements a feedback mechanism where relay devices evaluate channel quality based on reference signal strength and report channel quality indicators back to donor access nodes. This enables dynamic resource allocation and donor selection, ensuring service quality is maintained across extended coverage areas.
2Productivity
If relay wireless devices operate in crowded areas with high device density, then available throughput can be increased for end-user devices, but interference from multiple access nodes makes it difficult to determine preferred donor nodes
Solution Approach 1:
The patent applies local quality by transmitting reference signals at a higher power level specifically for channel estimation purposes, while downlink information is transmitted at normal power. This localized power enhancement for reference signals enables relay devices to accurately measure and compare channel qualities from multiple access nodes in crowded areas, facilitating proper donor node selection.
Solution Approach 2:
The patent changes the power parameter of reference signals to be higher than downlink information transmission power. This parameter change enables reliable channel quality measurement and donor node selection in high-density scenarios where multiple access nodes are present.
3Measurement precision
If reference signals are transmitted at higher power than downlink information, then channel estimation accuracy is improved for donor selection, but average transmission power must be maintained by reducing downlink information power in symbols containing reference signals
Solution Approach 1:
The patent changes the transmission power parameter of reference signals to be higher than downlink information, while simultaneously adjusting the downlink information power in symbols containing reference signals to maintain average power balance. This parameter adjustment strategy enables accurate channel estimation for donor selection without excessive overall power consumption.
Solution Approach 2:
The patent dynamically adjusts transmission power based on whether reference signals are present in a symbol. In symbols containing reference signals, downlink information power is reduced to compensate for the higher reference signal power, while in symbols without reference signals, normal power levels are used. This dynamic power adjustment maintains measurement accuracy while managing overall power consumption.
Data Source
AI summary
A method for donor selection in a relay access node includes identifying a plurality of candidate donor access nodes and obtaining one or more characteristics associated with each of the plurality of candidate donor access nodes. The method further includes determining a primary donor access node based on a comparison of the one or more characteristics between each of the plurality of candidate donor access nodes, and receiving a reference signal transmitted by the primary donor access node at a transmission power higher than a transmission power of downlink information transmitted by the primary donor access node. One or more quality characteristics of the primary donor access node are evaluated, and based on the one or more quality characteristics meeting a predetermined threshold, a connection to the primary donor access node is requested. Devices and systems relate to donor selection.