In-Device Coexistence Power Control for LTE-Wi-Fi Interference
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Solution Overview
Problem
In-device coexistence (IDC) interference between multiple wireless transceivers in mobile devices, such as LTE and WiFi, cannot be completely eliminated by filter technology, leading to significant interference and degraded downlink throughput, especially with the integration of unlicensed spectrum into LTE systems and the advent of 5G/NR technologies.
Innovation Solution
A method and apparatus for power control in user equipment (UE) that measures IDC interference using metrics like SINR, adjusts transmission power based on quality of service (QoS), and sends adjustment indications through a UART interface to co-located RAT units, allowing for soft decision-making to manage interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filter technology is used to eliminate IDC interference, then interference elimination is improved, but device complexity and cost increase
Solution Approach 1:
The patent changes the transmission power parameter dynamically based on measured IDC interference levels. The base station adjusts transmission power in response to interference measurements, converting a static filter-based approach into a dynamic parameter adjustment approach that reduces system complexity while maintaining interference mitigation effectiveness
Solution Approach 2:
The patent replaces the mechanical/filter-based interference elimination system with a power control-based soft decision system. Instead of using complex filter hardware to completely eliminate interference, the system uses power adjustment mechanisms to manage interference levels, achieving a more flexible and less complex solution
2Object-affected harmful factors
If frequency or time division multiplexing is used to manage IDC interference, then interference management is improved, but system complexity and cost increase
Solution Approach 1:
The patent implements dynamic power adjustment based on real-time interference measurements. The system continuously monitors IDC interference levels and adjusts transmission power accordingly, creating a dynamic response mechanism that replaces static frequency or time division multiplexing approaches with a more flexible power-based control system
Solution Approach 2:
The patent establishes a feedback loop where interference measurements are continuously monitored and used to adjust transmission power. This feedback mechanism allows the system to respond to actual interference conditions, replacing complex multiplexing solutions with a simpler power control system that adapts to changing conditions
3Reliability
If transmission power is increased to maintain reception quality, then reception quality is improved, but IDC interference increases
Solution Approach 1:
The patent dynamically adjusts transmission power parameter based on measured interference levels and reception quality conditions. The system changes power levels in response to feedback about interference and reception quality, creating a balanced approach that maintains reception quality while minimizing generated interference through adaptive power control
Solution Approach 2:
The patent implements dynamic power adjustment that responds to real-time conditions. Instead of using fixed high power levels that always generate maximum interference, the system dynamically adjusts power based on actual reception quality and interference measurements, creating a flexible balance between maintaining reception quality and minimizing harmful interference
Data Source
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AI summary
Methods and apparatuses for power control are disclosed for in-device coexistence (IDC). According to an embodiment, a first radio access technology (RAT) unit measures a metric indicating relative strength of traffic received by the first RAT unit with respect to IDC interference from a second RAT unit that is co-located with the first RAT unit on a user equipment (UE). The first RAT unit determines whether a condition to adjust transmission power of the second RAT unit is satisfied based at least on the measured metric. When the condition is satisfied, an adjustment indication related to a desired adjustment of the transmission power is generated based at least on the measured metric. The adjustment indication is sent to the second RAT unit.