Coexistence Mode Handover for In-Device Interference
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Solution Overview
Problem
Current communication systems face significant challenges in managing coexistence interference between different radio technologies, such as LTE, ISM, and GNSS, deployed on the same device, leading to performance degradation and unacceptable disruption in services like voice communications due to lack of effective Radio Resource Management mechanisms.
Innovation Solution
The implementation of a method and system that uses signaling and information elements to establish coexistence mode handover procedures, including a 'keeping time' parameter, to prevent handovers to interfering network nodes and separate LTE and non-LTE signaling in time, thereby avoiding interference and ping-pong effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radio technologies (LTE, ISM, GNSS) are deployed on the same device to support smart connected devices, then device functionality and versatility are improved, but in-device coexistence interference occurs causing performance degradation
Solution Approach 1:
The patent segments the operation of multiple radio technologies by introducing a coexistence mode that divides time resources into separate intervals for LTE and non-LTE components. This temporal segmentation prevents simultaneous operation that causes interference, allowing each radio technology to operate in dedicated time slots while maintaining overall device functionality.
2Adaptability or versatility
If LTE and non-LTE components operate concurrently to support various services, then service coverage and adaptability are improved, but coexistence interference arises between adjacent frequency bands
Solution Approach 1:
The patent implements periodic action by establishing a coexistence mode with periodic time intervals where LTE and non-LTE components alternately operate. The network node configures periodic patterns that switch between LTE-only intervals and non-LTE-only intervals, ensuring that interfering components are never active simultaneously while maintaining continuous service coverage through the periodic cycle.
3Reliability
If handover procedures are used to avoid interfering network nodes, then interference avoidance is improved, but ping-pong effects occur causing frequent handovers between nodes
Solution Approach 1:
The patent applies preliminary action by having the network node proactively configure a coexistence mode indication and keeping time parameter before handover decisions are made. This preliminary configuration prevents ping-pong effects by establishing predetermined rules that restrict handovers during keeping time intervals, so the user equipment does not need to repeatedly switch between interfering network nodes.
4Object-affected harmful factors
If filter technology is used to address coexistence interference, then interference reduction is improved, but terminal filters do not provide sufficient rejection on adjacent channel interference
Solution Approach 1:
The patent introduces an intermediary approach by using network-level coordination and time-division multiplexing as a mediator between interfering radio components. Instead of relying solely on terminal filters, the network node acts as an intermediary that configures coexistence modes and schedules radio operations to avoid interference, providing additional layers of protection beyond what terminal filters can achieve alone.
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 deployed in adjacent bands on the same device by providing coexistence mode handover procedures which establish an updateable "keeping time" parameter to prevent premature switch back or handover to an interfering network node after handoff.