Proactive In-Device Coexistence Interference Detection and Mitigation
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Solution Overview
Problem
In-device coexistence interference occurs in cellular networks due to proximity of radio transceivers, causing interference between LTE and other radio access technologies (RATs) like WiFi, Bluetooth, and GNSS, leading to degraded signal quality and potential network disruption.
Innovation Solution
A terminal device proactively detects in-device coexistence interference and sends an indication to the network node, allowing for autonomous or network-assisted interference avoidance through frequency division multiplexing (FDM) or time division multiplexing (TDM), which configures the UE to minimize interference by adjusting LTE signal transmission and reception schedules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radio transceivers are packaged inside the same device, then device functionality and communication versatility are improved, but in-device coexistence interference occurs between transmitters and receivers
Solution Approach 1:
The terminal device proactively detects potential IDC interference before it actually occurs by monitoring configuration parameters of external wireless systems and comparing them with LTE frequency bands. This preliminary detection enables the device to send early warnings to the network node and receive preventive configuration instructions, avoiding interference before it degrades signal quality or causes network disruption.
Solution Approach 2:
The network node acts as an intermediary that receives proactive interference warnings from the terminal device and provides configuration instructions to resolve potential IDC issues. The network node mediates between the terminal's external wireless systems and cellular system by adjusting LTE parameters such as frequency bands, time resources, or power settings to prevent interference while maintaining both communication functionalities.
2Power
If transmit power of one transmitter is much higher than received power level of another receiver, then transmission coverage is improved, but interference on the radio receiver increases
Solution Approach 1:
The terminal device proactively detects potential IDC interference by comparing the transmit power configuration of external wireless systems with the received power level of cellular signals. When potential interference is detected before it occurs, the device sends a proactive indication to the network node, which then provides configuration instructions to adjust LTE parameters and prevent interference before it degrades receiver performance.
3Reliability
If reactive detection of IDC interference is used, then interference mitigation can be performed, but signal quality is already degraded by the time detection occurs
Solution Approach 1:
The terminal device monitors configuration parameters of external wireless systems (WiFi, Bluetooth, GNSS) and proactively compares them with LTE frequency bands before interference occurs. When potential IDC interference is detected in advance, the device sends a proactive indication to the network node, which provides configuration instructions to prevent interference before it degrades signal quality or causes information loss.
Solution Approach 2:
The terminal device provides feedback to the network node about potential IDC interference conditions by sending proactive indications based on monitored configuration parameters. The network node responds with configuration instructions that adjust LTE operation to prevent interference. This feedback loop enables continuous optimization of coexistence between external wireless systems and cellular communication.
Data Source
AI summary
A method in a terminal device for In-Device Coexistence, IDC, interference handling is provided, the terminal device being configured to be in a communications network. The terminal device proactively detects an IDC interference between an in-device external wireless system and a cellular system, wherein said proactive detection occurs prior to a start of said IDC interference. Then, the terminal device sends, to a network node, an indication of IDC interference based on the proactively detecting. A terminal device, a network node and a method therein for IDC interference handling are also provided.