NB-IoT Higher Layer Filter Coefficient for Path Loss Estimation
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Solution Overview
Problem
The 3GPP does not specify how to determine the higher layer filtered narrowband Reference Signal Received Power (NRSRP) for LTE NB-IoT user terminals, making it impossible to estimate the path loss between the user terminal and the base station.
Innovation Solution
Configuring and sending a higher layer filter coefficient value to the NB-IoT device through radio resource control (RRC) signaling, allowing the device to calculate the current higher layer filtered NRSRP based on this coefficient, a preset coefficient value, and previous measurements, and subsequently determining the path loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 3GPP does not specify how to determine higher layer filtered NRSRP, then the standard remains flexible and adaptable, but it is impossible to estimate the path loss between user terminal and base station
Solution Approach 1:
The patent introduces a higher layer filter coefficient as a new parameter to transform the raw NRSRP measurement into a filtered value. This parameter change enables the system to achieve both standard flexibility (by allowing configurable filtering) and measurement precision (by providing a deterministic method for path loss estimation). The filtered NRSRP is calculated using the coefficient to smooth measurements and reduce noise.
2Device complexity
If higher layer filtered NRSRP is not defined, then device implementation remains simple, but uplink power control cannot be performed accurately
Solution Approach 1:
The patent applies preliminary action by pre-configuring the higher layer filter coefficient through RRC signaling before the device performs power control. This allows the device to have the necessary filtering parameter ready in advance, enabling accurate path loss estimation without increasing runtime complexity. The coefficient is provided once during connection setup and reused for multiple measurements.
3Use of energy by moving object
If path loss estimation is not possible, then device power consumption remains low, but uplink transmission quality deteriorates
Solution Approach 1:
The patent enables self-service by allowing the NB-IoT device to autonomously calculate its own path loss using the higher layer filtered NRSRP and the provided filter coefficient. The device performs this calculation independently without requiring continuous network assistance or complex multi-point measurements, thereby maintaining low power consumption while achieving reliable uplink transmission quality through accurate power control.
Data Source
AI summary
The present disclosure relates to an information configuration method and an information configuration apparatus, a method and an apparatus for determining received power, a base station, a narrowband Internet of Things device, and a computer-readable storage medium. The information configuration method includes: configuring a higher layer filter coefficient value for a narrowband Internet of Things device accessing a current network; and sending the higher layer filter coefficient value to the narrowband Internet of Things device. In an example of the present disclosure, by configuring the higher layer filter coefficient value for the narrowband Internet of Things device accessing the current network, and sending the higher layer filter coefficient value to the narrowband Internet of Things device, the narrowband Internet of Things device can determine the current higher layer filtered narrowband Reference Signal Received Power based on the higher layer filter coefficient value.