UE Downlink Sensitivity Relaxation for Carrier Aggregation Interference
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Solution Overview
Problem
The coexistence of multiple operating bands in User Equipment (UE) for Carrier Aggregation (CA) leads to reception performance issues due to interference, particularly in 3GPP LTE and NR systems, affecting the downlink signal reception sensitivity.
Innovation Solution
The UE is equipped with transceivers and processors that relax the reference sensitivity for downlink reception by implementing a Minimum Sensitivity Degradation (MSD) mechanism, allowing for improved coexistence of multiple bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple operating bands are aggregated for Carrier Aggregation, then system capacity and service availability are improved, but reception sensitivity deteriorates due to coexistence interference
Solution Approach 1:
The patent applies parameter changes by introducing MSD (Maximum Sensitivity Degradation) values that quantify and manage the sensitivity deterioration caused by band coexistence. Different MSD parameters are defined for different band combinations, allowing the system to adaptively adjust reception sensitivity requirements based on the specific band aggregation configuration, thus resolving the contradiction between maintaining high system capacity and ensuring adequate reception sensitivity
Solution Approach 2:
The patent implements partial action by selectively applying sensitivity relaxation only to specific band combinations that exhibit coexistence issues, rather than uniformly across all CA configurations. The network can choose to apply MSD-based sensitivity relaxation partially to affected UEs based on their specific band aggregation patterns, maintaining optimal performance for non-affected configurations while mitigating issues only where necessary
2Reliability
If reference sensitivity is relaxed by MSD for downlink reception, then coexistence issues between bands are mitigated, but measurement precision of reception sensitivity deteriorates
Solution Approach 1:
The patent introduces MSD (Maximum Sensitivity Degradation) as an intermediary parameter that mediates between the strict reference sensitivity requirements and the actual degraded sensitivity caused by band coexistence. Instead of directly relaxing reference sensitivity, the MSD acts as a compensatory mechanism that quantifies the degradation and allows the system to accommodate it, thus resolving the contradiction between improving coexistence compatibility and maintaining measurement precision
3Adaptability or versatility
If new operating band combinations are added for future compatibility, then adaptability is improved, but interference issues and reception performance problems increase
Solution Approach 1:
The patent applies preliminary action by pre-defining MSD values and sensitivity relaxation parameters for anticipated future band combinations before they are actually deployed. This allows the system to be forward-compatible with new bands while having predetermined interference management strategies in place, thus resolving the contradiction between improving adaptability and preventing interference issues
Data Source
AI summary
The present disclosure provides a UE. The UE includes at least one transceiver; at least one processor; and at least one memory that stores instructions and is operatively electrically connectable with the at least one processor. Operations performed based on the command being executed by the at least one processor may include: transmitting an uplink signal through the one or more transceivers; and receiving a downlink signal through the one or more transceivers, wherein a reference sensitivity set for the one or more transceivers for downlink reception is relaxed by the MSD.