LTE In-Device Coexistence Interference Avoidance via Time Division
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Solution Overview
Problem
Current communication systems face challenges in managing coexistence interference between different radio technologies, such as LTE and ISM/GNSS, due to insufficient rejection of adjacent channel interference, leading to performance degradation and quality of service issues.
Innovation Solution
A method and system that utilize buffer status reporting and time division multiplexing to efficiently allocate time patterns, allowing for the insertion of off-intervals into LTE on-intervals to separate and manage LTE and non-LTE signaling, thereby avoiding coexistence interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE and non-LTE radio components operate concurrently in adjacent bands, then device functionality and connectivity are improved, but coexistence interference degrades performance
Solution Approach 1:
The patent segments the radio resource allocation by introducing separate on-intervals and off-intervals for LTE and non-LTE components. The time pattern is divided into distinct periods where each radio technology operates independently, preventing simultaneous transmission and reception that causes interference. This segmentation allows both technologies to share the device while avoiding mutual interference.
Solution Approach 2:
The patent implements periodic time patterns with alternating on-intervals and off-intervals. The LTE component operates during its designated on-intervals and remains silent during off-intervals, while non-LTE components operate during off-intervals. This periodic switching creates a structured temporal separation that systematically prevents coexistence interference while maintaining both functionalities.
2Object-affected harmful factors
If time division multiplexing is used to separate LTE and non-LTE signaling, then coexistence interference is reduced, but time resource allocation complexity increases
Solution Approach 1:
The patent introduces dynamic adjustment mechanisms where the network can modify the time pattern parameters (on-interval duration, off-interval duration, periodicity) based on traffic conditions and interference levels. The buffer status reporting mechanism provides real-time feedback that enables dynamic optimization of the time division multiplexing parameters, allowing the system to adapt to changing conditions while managing complexity through standardized procedures.
3Reliability
If off-intervals are inserted into LTE on-intervals to accommodate non-LTE components, then quality of service for non-LTE is improved, but LTE transmission duration is reduced
Solution Approach 1:
The patent implements buffer status reporting as a feedback mechanism where the UE informs the network about its uplink buffer status. This feedback enables the network to make informed decisions about allocating off-intervals, balancing the QoS requirements of non-LTE components with the need to maintain adequate LTE transmission opportunities. The feedback loop allows dynamic adjustment to achieve optimal QoS for both radio technologies.
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AI summary
A method, system and device are provided for avoiding in-device coexistence interference between different radio technologies deployed in adjacent bands on the same device by reporting uplink buffer status information to the radio network and configuring LTE and non-LTE components to provide an in-device coexistence operation mode where non-LTE components use radio resources during the non-LTE on-intervals and during off-intervals inserted into the LTE on-intervals in response to predetermined trigger events.