Terminal Dual-Connectivity Sensitivity Degradation Mitigation
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Solution Overview
Problem
In 5G mobile communication, the dual-connectivity between LTE and NR leads to harmonic components and intermodulation distortion (IMD) affecting the downlink band of terminals, which compromises the reference sensitivity and reception quality.
Innovation Solution
The method involves setting a predetermined maximum sensitivity degradation (MSD) value for specific frequency bands to correct the reference sensitivity, allowing for dual-connectivity between E-UTRA and NR operating bands, thereby mitigating the impact of harmonic components and IMD on downlink signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dual-connectivity between E-UTRA and NR is implemented, then communication stability and data transfer rate are improved, but harmonic components and intermodulation distortion affect downlink band reception sensitivity
Solution Approach 1:
The patent applies parameter changes by adjusting the reference sensitivity threshold based on the specific band combination being used. Different MSD values are assigned to different E-UTRA and NR band combinations (e.g., 31.5 dB for bands 1/3 with n77, 30.5 dB for bands 1/3 with n78, 31.0 dB for bands 1/3 with n79). This allows the system to maintain dual-connectivity while compensating for the specific harmonic and IMD characteristics of each band combination.
Solution Approach 2:
The patent implements preliminary action by pre-configuring MSD values for various band combinations before actual communication occurs. The terminal and base station exchange information about the configured band combinations and their corresponding MSD values in advance, allowing the reference sensitivity to be properly adjusted before downlink reception begins, thereby preventing sensitivity degradation from the outset.
2Adaptability or versatility
If uplink signal transmission is performed in aggregated bands, then communication capability is enhanced, but harmonic components and intermodulation distortion impact downlink band of terminal
Solution Approach 1:
The patent changes the reference sensitivity parameter based on the uplink band combination being used. Specific MSD values are defined for different scenarios: 31.5 dB when using bands 1 and 3 with n77, 30.5 dB when using bands 1 and 3 with n78, and 31.0 dB when using bands 1 and 3 with n79. This parameter adjustment compensates for the harmful harmonic and IMD effects generated during uplink transmission.
Solution Approach 2:
The patent converts the harmful effect of harmonic components and intermodulation distortion into a manageable parameter by establishing predetermined MSD values. Instead of trying to eliminate the harmonic and IMD components physically, the system acknowledges their presence and compensates for them through parameter adjustment, thereby maintaining communication capability while accounting for the degradation.
3Reliability
If reference sensitivity is adjusted for MSD, then downlink signal reception stability is improved, but device complexity increases due to multiple band configuration management
Solution Approach 1:
The patent reduces device complexity through preliminary action by pre-configuring and exchanging band combination information and corresponding MSD values between the base station and terminal before communication begins. This allows the terminal to automatically apply the correct reference sensitivity adjustment without requiring complex real-time calculations or user intervention, thereby maintaining reception stability while simplifying device operation.
Data Source
AI summary
Provided is a method for transmitting and receiving a signal by a terminal supporting dual-connectivity between evolved universal terrestrial radio access (E-UTRA) and new radio (NR). In the method, when the E-UTRA uses at least one of E-UTRA operating bands 1, 3, 5, and 7, when the NR uses one of NR operating bands n77, n78, and n79, when an uplink center frequency of a first operating band among the E-UTRA operating bands and the NR operating bands is a first value, and when a downlink center frequency of the first operating band is a second value, a predetermined maximum sensitivity degradation (MSD) is applied to reference sensitivity used for reception of the downlink signal.