MSD Values for Power Class 2 UE Self-Interference
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Solution Overview
Problem
The impact of self-interference, such as harmonics and Intermodulation Distortion (IMD), and cross-band isolations on power class 2 User Equipment (UE) in certain E-UTRA NR Dual Connectivity (EN-DC) and inter-band Carrier Aggregation (CA) band combinations has not been adequately analyzed, leading to undefined Maximum Sensitivity Degradation (MSD) values.
Innovation Solution
The proposed solution involves analyzing and determining the MSD values for specific EN-DC and inter-band CA band combinations, particularly for power class 2 UE, to account for self-interference and cross-band isolations. This analysis allows for the relaxation of reference sensitivity requirements, enabling the UE to operate within acceptable performance standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power class 2 UE operates in EN-DC and inter-band CA band combinations, then system capacity and coverage are expanded, but self-interference (harmonics and IMD) and cross-band isolation cause sensitivity degradation
Solution Approach 1:
The patent introduces Maximum Sensitivity Degradation (MSD) values as new parameters to characterize and quantify the interference effects in specific band combinations. By defining these parameters, the system can adapt power class 2 UE operations to account for predicted interference levels, resolving the contradiction between band flexibility and interference susceptibility.
2Reliability
If reference sensitivity requirements are strictly enforced for power class 2 UE, then communication reliability is maintained, but the UE cannot operate in certain EN-DC and inter-band CA band combinations
Solution Approach 1:
The patent applies different sensitivity requirements to different band combinations based on their specific interference characteristics. Instead of a uniform sensitivity requirement, the system introduces band-specific MSD values that allow power class 2 UE to operate in previously restricted band combinations while maintaining acceptable reliability through localized interference characterization.
3Use of energy by moving object
If dual uplink transmission with 3 dB power boosting is implemented, then power class 2 UE can access higher frequency bands, but IMD source increases and affects reception sensitivity
Solution Approach 1:
The patent converts the harmful IMD and harmonic effects into a quantifiable parameter (MSD value) that can be used to predict and compensate for interference. By characterizing the interference generated by power boosting, the system enables power class 2 UE to achieve higher power output while managing the resulting harmful effects through defined performance criteria.
Data Source
AI summary
There is provided a UE in a wireless communication system, the UE comprising: at least one transceiver; at least one processor configured to use CA based on two NR operating bands; and at least one computer memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising: transmitting, via the at least one transceiver, an uplink signal via one NR operating band among the two NR operating bands; and receiving, via the at least one transceiver, a downlink signal on other NR operating band, different from the one NR operating band, among the two NR operating bands.