Dedicated RACH Preambles for In-Device Coexistence Interference Avoidance
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Solution Overview
Problem
Current technologies fail to effectively manage coexistence interference between different radio technologies, such as LTE and ISM/GNSS, within a single device, leading to performance degradation due to mutual interference, which existing filter technologies cannot adequately address.
Innovation Solution
A method and system that utilize dedicated access preambles over a random access channel to send IDC indicators to the network, allowing for quick access and response to interference situations, with the network providing interference avoidance solutions like FDM or TDM through Random Access Response messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radio technologies (LTE, ISM, GNSS) are operated concurrently in the same device, then device functionality and versatility are improved, but coexistence interference between components increases
Solution Approach 1:
A coexistence manager acts as an intermediary component that receives interference indicators from affected radio components (e.g., LTE receiver), determines appropriate avoidance actions, and coordinates with other radio components (e.g., ISM transmitter, GNSS receiver) to resolve the interference. This mediator approach enables systematic management of multi-radio coexistence without requiring complex hardware modifications.
2Object-affected harmful factors
If filter technology is used to address coexistence interference, then interference rejection is attempted, but sufficient rejection on adjacent channel interference is not achieved
Solution Approach 1:
The system dynamically adjusts radio operation parameters based on real-time interference conditions. When interference is detected, the coexistence manager implements dynamic solutions such as timing adjustments, frequency shifts, or operational denials for specific radio components. This dynamic adaptation provides more effective interference mitigation than static filter technology alone.
3Speed
If dedicated access preambles and random access procedures are implemented for quick IDC indication, then access speed and response time are improved, but signaling complexity and procedure overhead increase
Solution Approach 1:
Dedicated access preambles are pre-configured and allocated for IDC indication purposes before interference occurs. The network pre-assigns specific preambles to UEs that may experience coexistence interference, allowing immediate transmission of interference indicators without complex signaling setup. This preliminary preparation reduces both response time and procedural complexity during actual interference events.
Data Source
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AI summary
A method, system and device are provided for avoiding in-device coexistence interference between different radio technologies by allocating random access channel preambles to include one or more dedicated access preambles to be sued for sending IDC interference indication messages over a random access channel (RACH) to a radio access network. In response, the radio network provides control parameters and/or instructions for avoiding interference in a random access response message corresponding to the IDC interference indication message using one or more fields in the MAC subheader and payload fields of a designated IDC MAC PDU message.