Carrier Aggregation Sensitivity Degradation Management
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Solution Overview
Problem
In wireless communication systems, particularly in 3GPP LTE and NR, the occurrence of harmonics and intermodulation distortion (IMD) components can lead to unsatisfied reference sensitivity for downlink signals due to uplink signal transmission.
Innovation Solution
A device configured to operate in a wireless system with a transceiver capable of transmitting uplink signals via two E-UTRA operating bands for carrier aggregation and receiving downlink signals via one or more bands from three E-UTRA operating bands, with a pre-configured Maximum Sensitivity Degradation (MSD) value applied to the reference sensitivity of the third band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink signal transmission is performed via two bands for carrier aggregation, then communication capacity is improved, but harmonics and intermodulation distortion components occur causing reference sensitivity to deteriorate
Solution Approach 1:
The patent applies parameter changes by introducing a pre-configured Maximum Sensitivity Degradation (MSD) value that modifies the reference sensitivity parameter. This allows the system to adjust the reference sensitivity threshold based on the specific band combination being used for carrier aggregation, thereby accommodating the expected sensitivity degradation from harmonics and IMD while maintaining reliable communication.
Solution Approach 2:
The patent implements preliminary action by pre-configuring the MSD value before actual carrier aggregation operations begin. This pre-configuration allows the system to anticipate and prepare for the sensitivity degradation that will occur during uplink transmission, rather than attempting to correct it after the fact.
2Productivity
If downlink signal reception is performed via three bands for carrier aggregation, then system capacity is improved, but sensitivity degradation occurs in the reception band affected by own transmission signal
Solution Approach 1:
The patent changes the reference sensitivity parameter by applying a pre-configured MSD value specifically to the third downlink band that is affected by uplink transmission. This parameter adjustment allows the system to maintain accurate sensitivity measurements despite the presence of harmonics and intermodulation distortion from simultaneous uplink transmission.
Solution Approach 2:
The patent applies local quality by selectively applying the MSD value only to the specific downlink band (third band) that is affected by uplink transmission, rather than uniformly adjusting all bands. This targeted approach maintains high measurement precision in unaffected bands while accommodating degradation in the affected band.
Data Source
AI summary
One general aspect of the present disclosure includes a device configured to operate in a wireless system. The device including: a transceiver configured with a plurality of Evolved UMTS (Universal Mobile Telecommunications System) Terrestrial Radio Access (E-UTRA) operating bands; and a processor operably connectable to the transceiver, the processer is configured to: control the transceiver to transmit an uplink signal via two bands among the plurality of E-UTRA operating bands, wherein the two bands are configured for uplink carrier aggregation (CA), and consists of a first band and a second band; and control the transceiver to receive a downlink signal via one or more band from the three bands among the plurality of E-UTRA operating bands, wherein the three bands are configured for downlink CA, are consists of the first band, the second band, and a third band.