Wireless Link Quality Measurement Using DRS Status Reasoning
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Solution Overview
Problem
In MulteFire systems, the assessed receiving signal quality is lower than the actual quality due to inaccurate in-sync and out-of-sync detection methods, leading to inaccurate results in wireless link measurements.
Innovation Solution
A method that determines the status generation reason for undetected Discovery Reference Signals (DRS) in wireless link measurement windows, allowing for more accurate detection of wireless link quality by distinguishing between LBT failure and poor channel quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the UE uses the LTE in-sync detection method to assess receiving signal quality in MulteFire system, then the detection process is simple, but the assessed RSRQ is lower than actual channel quality leading to inaccurate detection results
Solution Approach 1:
The patent changes the parameters used for quality assessment from RSRQ (which assumes DRS non-detection means poor quality) to RSRP (which can be reliably measured). This parameter substitution resolves the contradiction by maintaining detection simplicity while improving accuracy, as RSRP measurement is not affected by the same ambiguities as RSRQ in MulteFire systems where DRS transmission is conditional on LBT success
Solution Approach 2:
The patent segments the quality assessment process into two independent measurements: RSRP for signal strength and blockage detection for channel quality. This segmentation allows each measurement to be optimized independently - RSRP provides accurate signal level assessment while blockage detection separately identifies channel issues, together providing comprehensive quality assessment without the inaccuracies of RSRQ
2Loss of energy
If the BS transmits only CRS in subframes with DRS or PDSCH, then the transmission overhead is reduced, but the UE has insufficient subframes for wireless link detection
Solution Approach 1:
The patent makes the DRS serve multiple functions: it acts as both a reference signal for quality measurement and a blockage detection signal. By configuring the DRS with resource allocation type 1 and enabling the UE to detect its presence/absence, the same signal structure fulfills dual purposes, ensuring reliable link detection without requiring additional dedicated reference signals in every subframe
Solution Approach 2:
The patent implements feedback mechanisms where the UE reports RSRP measurements and blockage detection results to the BS. This feedback loop allows the BS to adjust transmissions and the UE to adapt its measurements, ensuring reliable wireless link detection even with reduced CRS transmission, as the system continuously optimizes based on measured conditions
Data Source
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AI summary
A method for measuring a quality of a wireless link and a user equipment are provided. The method includes obtaining a probability that a base station successfully transmits a DRS; detecting a CRS in each sub frame in a predetermined assessment period to obtain a subframe status of each subframe, the subframe status including a status that the CRS is detected and a status that the DRS is not detected in a wireless link measurement window; determining a status generation reason of a subframe having the status that the DRS is not detected in the wireless link measurement window, according to the probability; and performing a predetermined detection to the quality of the wireless link in the predetermined assessment period according to the status generation reason and the subframe status of the subframe, so as to determine a state of the wireless link.