Radio Duplex Mode Switching for Intermodulation Mitigation
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Solution Overview
Problem
Intermodulation interference occurs between LTE and ISM band radios when both are active simultaneously, leading to suboptimal performance and throughput issues in LTE reception, as the frequency spacing between ISM and LTE uplink/downlink causes unwanted behavior in LTE receivers.
Innovation Solution
The terminal dynamically signals its duplex-status to the network, treating it as half-duplex when both radio technologies are active on problem-prone frequency bands, using a new signaling procedure to adjust resource allocation and avoid concurrent transmission and reception, allowing the network to manage resource allocation accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radio stacks operate simultaneously on different radio technologies, then service coverage and functionality are improved, but intermodulation interference occurs between LTE and ISM band radios
Solution Approach 1:
The patent implements dynamic switching between full-duplex and half-duplex modes based on real-time detection of radio operation states. When ISM band transmission and LTE reception are detected simultaneously, the system dynamically transitions to half-duplex mode to eliminate intermodulation interference, thereby maintaining service coverage while preventing harmful interference effects.
Solution Approach 2:
The system changes the operational parameter of duplex mode from static to dynamic by detecting frequency combinations and transmission/reception states. When problematic frequency spacing is detected between ISM and LTE bands, the parameter changes from full-duplex to half-duplex operation, effectively controlling interference while preserving multi-radio functionality.
2Productivity
If the terminal operates in full-duplex mode for LTE, then throughput and efficiency are improved, but intermodulation interference from concurrent ISM transmission disturbs LTE reception
Solution Approach 1:
The system dynamically adjusts duplex mode based on real-time detection of ISM transmission states. When ISM transmission is detected during LTE reception, the system transitions from full-duplex to half-duplex mode, temporarily reducing LTE throughput to eliminate intermodulation interference. This dynamic adjustment maintains optimal performance while preventing harmful interference.
Solution Approach 2:
The system performs preliminary detection of ISM transmission states before LTE reception is significantly degraded by intermodulation interference. By detecting the presence of ISM transmission in advance, the system can proactively switch to half-duplex mode, preventing the harmful interference effect before it degrades LTE throughput.
3Reliability
If the terminal switches to half-duplex mode to avoid interference, then LTE reception performance is improved, but time allocation efficiency decreases
Solution Approach 1:
The system dynamically switches between full-duplex and half-duplex modes based on real-time detection of interference conditions. Half-duplex mode is activated only when ISM transmission and LTE reception occur simultaneously, minimizing the time loss while ensuring LTE reception performance is maintained during critical interference periods.
Solution Approach 2:
The system implements periodic detection of radio operation states and dynamically adjusts duplex mode accordingly. This periodic monitoring ensures that half-duplex mode is activated only when necessary to prevent interference, minimizing time allocation efficiency loss while maintaining reliable LTE reception when needed.
Data Source
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AI summary
In accordance with an example embodiment of the present invention, an apparatus, comprising at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform at least the following: deciding to switch to a half-duplex mode of operations upon detecting a triggering condition including that multiple radio stacks are activated at the apparatus simultaneously; signaling an associated base station the decision of switching to the half-duplex mode; and entering the half-duplex mode of operation, is disclosed.