Dual-Connectivity Terminal Carrier Frequency Offset
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Solution Overview
Problem
In 5G mobile communication, the aggregation of LTE and NR downlink carriers leads to harmonic components and intermodulation distortion (IMD) in the uplink signal, affecting the downlink band of terminals, which compromises the reference sensitivity and requires a maximum sensitivity degradation (MSD) value to mitigate these issues.
Innovation Solution
A method for dual-connectivity between E-UTRA and NR, where specific MSD values are applied to manage the interference by adjusting the center frequencies of carriers operating in different bands, such as E-UTRA bands 1, 3, 19, and 21 with NR bands n78 and n79, to prevent sensitivity degradation in the downlink signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LTE and NR downlink carriers are aggregated in dual-connectivity mode, then communication speed and capacity are improved, but harmonic components and intermodulation distortion affect the downlink band causing sensitivity degradation
Solution Approach 1:
The patent applies parameter changes by adjusting the center frequency offset between uplink and downlink carriers. Specifically, it sets the uplink center frequency to be offset from the downlink center frequency by a predetermined value, which prevents the uplink signal's harmonic components and intermodulation distortion from falling into the downlink reception band, thereby maintaining reference sensitivity while enabling carrier aggregation
Solution Approach 2:
The patent introduces a frequency offset as an intermediary parameter between the uplink and downlink carriers. This frequency offset acts as a mediator that separates the harmful spectral components from the reception band, allowing both carriers to operate simultaneously without mutual interference
2Quantity of substance
If uplink signal is transmitted using aggregated carriers, then data transmission capacity is improved, but harmonic components and IMD impact the downlink band of terminal
Solution Approach 1:
The patent changes the frequency parameter by setting a specific offset between uplink and downlink center frequencies. This frequency parameter adjustment ensures that when uplink signals are transmitted with high power, their harmonic components and intermodulation distortion products do not overlap with the downlink reception frequencies, thus maintaining high data transmission capacity without harmful interference
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 terminal is configured to aggregate at least two carriers and when the at least two carriers include one of E-UTRA operating bands 1, 3, 19, and 21 and at least one of NR operating bands n78 and n79, an uplink center frequency of a first carrier among the at least two carriers is a first value and a downlink center frequency of the first carrier is a second value, a predetermined maximum sensitivity degradation (MSD) is applied to a reference sensitivity used for reception of the downlink signal.