Dual Connectivity Terminal MSD Configuration for Interference Mitigation
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Solution Overview
Problem
Current 5G mobile communication systems face challenges in achieving high reliability and low latency, particularly in scenarios like automatic driving and factory automation, due to insufficient downlink transmission rates and interference from harmonic components and intermodulation distortion in dual-connectivity setups between LTE and NR.
Innovation Solution
A method and user equipment (UE) design that supports dual-connectivity between E-UTRA and NR, utilizing specific operating bands and configuring Maximum Sensitivity Degradation (MSD) values to mitigate interference and ensure reliable downlink signal reception by applying MSD to reference sensitivity, thereby correcting for harmonic and intermodulation distortion effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual-connectivity between LTE and NR is implemented to ensure communication stability, then communication reliability is improved, but harmonic components and intermodulation distortion affect the downlink band causing sensitivity degradation
Solution Approach 1:
The patent applies parameter changes by introducing MSD (Maximum Sensitivity Degradation) values that are specifically configured for different band combinations. These MSD parameters quantify the sensitivity degradation caused by harmonic and intermodulation distortion, allowing the system to adjust reference sensitivity levels accordingly. The base station configures MSD parameters to the UE based on the active band combination, enabling the UE to compensate for the predicted sensitivity degradation in each specific dual-connectivity scenario.
2Productivity
If uplink signal transmission is performed in dual-connectivity mode, then data throughput is improved, but interference is generated that affects the downlink reception band
Solution Approach 1:
The patent implements preliminary action by pre-calculating and configuring MSD values for various band combinations before actual dual-connectivity operation. The base station determines the appropriate MSD parameter based on the configured band combination and transmits this information to the UE in advance via RRC signaling. This allows the UE to have the correct sensitivity degradation compensation ready before interference occurs, rather than attempting to correct it after the fact.
3Measurement precision
If reference sensitivity is used for downlink signal reception without MSD adjustment, then reception sensitivity is maintained under ideal conditions, but actual sensitivity degrades due to self-interference from uplink transmission
Solution Approach 1:
The patent implements a feedback mechanism where the base station monitors the configured band combination and determines the appropriate MSD parameter, then feeds this information back to the UE through RRC signaling. The UE uses this feedback to adjust its reference sensitivity calculation by applying the configured MSD value, thereby compensating for the expected self-interference. This closed-loop approach ensures that the UE's sensitivity measurements accurately reflect real-world dual-connectivity conditions.
Data Source
AI summary
One disclosure of the present specification provides a terminal for transmitting and receiving a signal, the terminal supporting dual connectivity between E-UTRA and NR. The terminal comprises: a transceiver for transmitting an uplink signal and receiving a downlink signal by using the dual connectivity; and a processor for controlling the transceiver, wherein the transceiver is configured to use two of E-UTRA operating bands 1, 3, 18, 21, 28, 41, and 42 and NR operating band n79, and when an uplink center frequency of a first operating band among the E-UTRA operating bands and the NR operating band n79 is a first value and a downlink center frequency of the first operating band is a second value, an MSD is preset, and on the basis of a dual uplink operation, the MSD may be applied to reference sensitivity used for receiving the downlink signal.