Carrier Aggregation Sensitivity Compensation via MSD Thresholds
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Solution Overview
Problem
In LTE/LTE-A systems, carrier aggregation leads to harmonic generation and intermodulation distortion that degrade the receiving sensitivity of downlink signals, particularly when three downlink carriers and two uplink carriers are aggregated, causing interference and reducing signal quality.
Innovation Solution
The method involves configuring three downlink carriers and two uplink carriers within specific E-UTRA operating bands and applying a predetermined maximum sensitivity degradation (MSD) to the receiving reference sensitivity, ensuring successful signal reception by mitigating harmonic and intermodulation distortion effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation of three downlink carriers and two uplink carriers is configured, then system capacity and data throughput are improved, but harmonic generation and intermodulation distortion increase causing receiving sensitivity degradation
Solution Approach 1:
The patent applies parameter changes by introducing MSD (Maximum Sensitivity Degradation) values specific to different band combinations. For example, when DL bands 1, 3, and 40 are aggregated with UL bands 1 and 3, an MSD of 8.0 dB is applied to DL band 40. This adjusts the receiving sensitivity threshold to account for harmonic and intermodulation distortion effects, resolving the contradiction between maintaining high data throughput through carrier aggregation and ensuring reliable signal reception despite sensitivity degradation.
2Productivity
If more uplink carriers are aggregated for higher uplink capacity, then uplink data transmission is improved, but interference to downlink band increases
Solution Approach 1:
The patent converts the harmful effect of uplink-generated harmonics and intermodulation distortion into a manageable parameter by calculating MSD values for each downlink band. These MSD values represent the quantified degradation caused by uplink carriers. By applying these predetermined MSD values as compensation thresholds, the system can maintain accurate receiving sensitivity judgments even in the presence of uplink interference, thus enabling higher uplink capacity without sacrificing downlink reception reliability.
3Adaptability or versatility
If carrier aggregation configurations like 3DL/2UL are used, then network resource utilization is improved, but signal quality degradation occurs due to harmonic and intermodulation distortion
Solution Approach 1:
The patent employs preliminary action by pre-calculating and storing MSD values for various downlink band combinations before actual signal reception. For instance, MSD values are predetermined for combinations such as DL bands 1, 3, 40 with UL bands 1, 3 (MSD=8.0 dB for band 40), DL bands 1, 5, 40 with UL bands 1, 5 (MSD=9.0 dB for band 40), and DL bands 2, 12, 30 with UL bands 2, 12 (MSD=12.0 dB for band 30). During operation, the appropriate MSD value is directly applied based on the active band combination, enabling rapid compensation for signal quality degradation without real-time calculation delays.
Data Source
AI summary
There is provided a method for transmitting/receiving a signal in carrier aggregation. The method may comprise: transmitting an uplink signal by using two uplink carriers when three downlink carriers and two uplink carriers are configured to be aggregated. The three downlink carriers include three operating bands among evolved universal terrestrial radio access (E-UTRA) operating bands 1, 2, 3, 5, 12, 30 and 40 and the two uplink carrier includes two operating bands thereamong. The method may comprise: receiving a downlink signal through all of three downlink carriers. Here, a predetermined maximum sensitivity degradation (MSD) is applied to receiving reference sensitivity of the downlink signal, thereby successfully receiving the signal.