LTE Power Control for In-Device Coexistence Interference
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Solution Overview
Problem
In-device coexistence (IDC) interference occurs due to overlapping or adjacent radio spectrums in wireless communication devices with multiple radio transceivers, leading to significant degradation in performance, as the transmission power of one radio transceiver interferes with the reception of another, necessitating effective interference mitigation solutions.
Innovation Solution
A power control method is implemented in wireless communication devices equipped with multiple radio modules, where the LTE radio module adjusts its transmission power or power parameters to mitigate IDC interference, either locally or by informing the serving eNB through existing reporting mechanisms, thereby reducing coexistence interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission power of one radio transceiver is increased to improve communication quality, then the signal strength is improved, but interference to other co-located radio transceivers increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transmission power level of the radio transceiver based on detected interference conditions. When IDC interference is detected affecting other radio transceivers (WiFi, Bluetooth, GNSS), the system modifies the power parameter to reduce interference while maintaining acceptable communication quality. This is implemented through power control mechanisms that change the transmission power parameter in response to interference measurements.
2Object-generated harmful factors
If power control is applied to reduce transmission power and mitigate interference, then IDC interference is reduced, but communication coverage and reliability may deteriorate
Solution Approach 1:
The patent implements dynamics by making the transmission power adaptive rather than static. The power control mechanism continuously monitors interference conditions and dynamically adjusts power levels in real-time. This allows the system to maintain high power when interference is not present (ensuring coverage and reliability) and reduce power when interference is detected (mitigating IDC issues), thus resolving the contradiction between interference reduction and communication reliability.
Solution Approach 2:
The system employs feedback mechanisms where the radio transceiver monitors interference levels caused by its own transmissions to other co-located radios. This feedback information is used to adjust transmission power parameters, creating a closed-loop control system that balances interference mitigation with maintaining adequate communication quality and coverage.
3Adaptability or versatility
If multiple radio transceivers operate simultaneously in overlapping spectrums to provide diverse network access, then network connectivity and service diversity are improved, but coexistence interference increases
Solution Approach 1:
The patent applies local quality by implementing interference mitigation specifically at the local device level through power control of individual radio transceivers. Rather than requiring network-wide coordination or spectral separation, the solution addresses interference locally by adjusting the transmission characteristics of each radio within the device, allowing multiple radios to coexist despite operating in overlapping spectrums.
Data Source
AI summary
A power control method to mitigate in-device coexistence (IDC) interference is provided. A wireless communication device (UE) is equipped with a first LTE radio module and a second co-located WiFi/BT/GSNN radio module. Upon detecting coexistence or IDC interference, the UE applies power control method to mitigate the interference. In a first embodiment, the LTE radio module adjusts its power parameters locally without informing the serving eNB. In a second embodiment, the LTE radio module adjusts its power parameters and implicit informs the eNB through existing PHR reporting. In a third embodiment, the LTE radio module changes its power or power class and explicitly informs the eNB through UE capability or new RRC message or MAC CE. Power control can be used as a low cost and lightweight solution before applying other heavyweight solutions that either require more resource or control overhead, or have higher impact on throughput.