RF Coexistence Management in Dual-SIM Devices
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Solution Overview
Problem
Dual-SIM-dual-active mobile communication devices face interference issues due to receiver desensitization caused by the proximity of RF chains, leading to corrupted signals and reduced network performance.
Innovation Solution
Implementing robust Rx processing in dual-SIM-dual-active devices to detect and mitigate interference by determining the level of de-sense, creating an RF coexistence management strategy, and configuring operations to minimize impact on the aggressor while improving the victim's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two RF chains are positioned close together in a DSDA device, then the device can support dual-SIM-dual-active functionality with simultaneous transmit and receive capabilities, but receiver desensitization occurs due to noise interference from the nearby transmitter
Solution Approach 1:
The patent segments the RF signal processing into multiple stages: initial filtering, amplification, and secondary filtering. By dividing the signal path into distinct segments with specific functions, the system can apply targeted interference mitigation at each stage, reducing the overall impact of transmitter noise on the receiver while maintaining dual-SIM-dual-active capability
Solution Approach 2:
The patent introduces intermediate filtering stages and signal processing components that act as mediators between the transmitter and receiver RF chains. These intermediary elements selectively attenuate interfering frequencies while preserving desired signals, resolving the contradiction between close RF chain positioning and receiver sensitivity
2Object-affected harmful factors
If a transmit filter is positioned after signal amplification to effectively reduce interference, then filter performance improves, but the filter must handle high power levels which increases cost
Solution Approach 1:
The filtering function is segmented into multiple stages: a first filter before amplification handling initial interference, and a second filter after amplification providing final interference reduction. This segmentation allows each filter to operate at lower power levels appropriate to its position, reducing the cost and complexity of high-power filter requirements while maintaining effective interference reduction
Solution Approach 2:
The patent applies preliminary filtering before signal amplification to remove a portion of interfering signals in advance. This preliminary action reduces the burden on subsequent filtering stages, allowing them to operate at lower power levels and reducing overall system cost while maintaining effective interference reduction
3Reliability
If the victim RF chain implements robust Rx processing to mitigate de-sense effects, then receiver performance improves, but the aggressor's transmission may be impacted
Solution Approach 1:
The patent applies robust Rx processing selectively to the victim RF chain only when de-sense conditions are detected, rather than continuously on both chains. This localized application mitigates receiver performance issues while minimizing impact on aggressor transmission, as the processing is activated only when and where needed
Solution Approach 2:
The system monitors interference levels and dynamically activates robust Rx processing based on detected de-sense conditions. This feedback mechanism ensures that robust processing is applied only when necessary to maintain receiver performance, thereby minimizing impact on aggressor transmission quality while maintaining reliability when needed
Data Source
AI summary
The various embodiments include a dual-SIM-dual-active (DSDA) device and methods for implementing robust receive (Rx) processing to resolve radio frequency coexistence interference between two subscriptions operating on the DSDA device. The DSDA device may detect when a subscription (the “aggressor”) de-senses the other subscription (the “victim”) as a result of the aggressor's transmissions, and in response, implement robust Rx processing to mitigate the effects of de-sense on the victim while causing minimal impact to the aggressor.