EIRP Declaration for Base Station Wide Bands
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Solution Overview
Problem
Current EIRP declaration methods in TS 38.104 are inadequate for carrier aggregation (CA) support and conformance testing, particularly for wide operating bands with fractional bandwidths greater than 6%, as they fail to accurately reflect the directivity variations across the frequency range, leading to misalignment between RF core specifications and conformance test requirements.
Innovation Solution
The proposed solution involves declaring EIRP for multiple frequencies within an operating frequency band, including a first, second, and third frequency, with specific EIRP values for frequency ranges between them, and calculating EIRP using the equation EIRP=TRP+D, where TRP is the total radiated power and D is the directivity, to account for directivity changes across the band, thereby providing a more accurate representation of radiated transmit power characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If EIRP is declared only for lowest and highest frequencies, then the declaration process is simple, but the accuracy of EIRP representation across the entire frequency band deteriorates
Solution Approach 1:
The frequency band is segmented into multiple sub-bands, with EIRP declared for each sub-band's center frequency. This divides the continuous frequency range into discrete segments, allowing accurate representation of EIRP variations across the entire band while maintaining a structured, manageable declaration process.
Solution Approach 2:
Center frequencies of sub-bands serve as intermediary reference points between the lowest and highest frequencies. By declaring EIRP at these intermediate frequencies and using interpolation, the patent achieves accurate EIRP representation across the full band without requiring declarations at every possible frequency point.
2Measurement precision
If EIRP is declared for multiple frequencies including mid frequency, then the accuracy of EIRP representation improves, but the complexity of conformance testing increases
Solution Approach 1:
The testing process is segmented into two distinct phases: verification of declared EIRP values at specific center frequencies, and validation of interpolation accuracy between these points. This segmentation makes the complex testing process more manageable and systematic.
Solution Approach 2:
Instead of testing at every possible frequency point, the patent applies partial action by testing only at center frequencies and key interpolation points. This provides sufficient verification of EIRP accuracy without the excessive complexity of exhaustive testing across the entire frequency band.
3Adaptability or versatility
If fractional bandwidth is large (>6%), then the operating band supports more frequency diversity, but the variation in antenna directivity over frequency increases
Solution Approach 1:
The patent applies local quality by declaring EIRP at center frequencies of different sub-bands, allowing the directivity characteristics to be accurately captured at each local frequency region. This ensures that variations in antenna directivity are properly accounted for in different parts of the frequency band.
Solution Approach 2:
The patent introduces a new dimension to EIRP declaration by adding frequency as a varying parameter across multiple sub-bands. Instead of a single EIRP value, the system now declares EIRP as a function of frequency, with values at center frequencies and interpolated values between them, creating a two-dimensional representation (frequency vs. EIRP).
Data Source
AI summary
A method of declaring Equivalent Isotropically Radiated Power (EIRP) for an operating frequency band of a base station. The method includes: declaring a first EIRP for a first frequency of the operating frequency band, declaring a second EIRP for a second frequency of the operating frequency band, and declaring a third EIRP for a third frequency of the operating frequency band, wherein the third frequency is between the first frequency and the second frequency, and wherein the second frequency is higher than the first frequency.