IDC Interference Indicator for Wireless Handover Robustness
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Solution Overview
Problem
Current wireless communication systems face challenges in detecting and mitigating radio link failures (RLF) due to in-device coexistence (IDC) interference, which can lead to connection failures, unnecessary handovers, and ping-pong issues during intra-LTE or inter-radio access technology mobility.
Innovation Solution
A method and apparatus for transmitting an indicator in a wireless communication system that initiates handovers and reestablishes connections, specifically indicating whether the handover is to avoid IDC interference, allowing the target eNodeB to take necessary measures to mitigate interference issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover is performed without IDC interference indicator, then mobility continuity is maintained, but radio link failure occurs due to undetected IDC interference
Solution Approach 1:
The source eNodeB transmits the IDC interference indicator to the target eNodeB before the handover is executed. This preliminary action allows the target eNodeB to prepare appropriate interference mitigation measures in advance, preventing radio link failure caused by IDC interference while maintaining seamless mobility continuity.
Solution Approach 2:
The IDC interference indicator acts as an intermediary information element that conveys interference status from the source eNodeB to the target eNodeB. This mediator enables the target eNodeB to make informed decisions about handover execution and interference mitigation without requiring complex direct interference detection mechanisms.
2Object-affected harmful factors
If handover is executed to avoid IDC interference, then interference mitigation is achieved, but unnecessary handovers may occur
Solution Approach 1:
The IDC interference indicator provides localized information about interference conditions at the source cell, enabling the target eNodeB to make precise decisions about handover necessity. This localized quality information allows differentiation between genuine interference problems requiring handover and normal conditions where handover would be unnecessary.
Solution Approach 2:
The handover decision process incorporates the IDC interference indicator as an additional parameter that modifies the handover threshold and criteria. When the indicator signals high IDC interference, the system adjusts handover parameters to facilitate interference avoidance; when interference is low, normal handover efficiency is maintained.
3Reliability
If IDC interference detection is implemented, then radio link failure is reduced, but signaling overhead increases
Solution Approach 1:
The IDC interference indicator is extracted as a separate, dedicated information element within the handover signaling framework. This extraction allows the interference status to be conveyed efficiently using a compact representation rather than requiring extensive detailed interference measurement reports, thereby reducing overall signaling overhead while maintaining reliable detection capability.
Data Source
AI summary
A method and apparatus for transmitting an indicator in a wireless communication system is provided. According to an embodiment of the present invention, when a source eNodeB (eNB) initiates handover for a user equipment (UE), it informs a target eNB about whether the handover is to avoid in-device coexistence (IDC) interference problems or not. Alternatively, according to another embodiment of the present invention, an eNB, which the UE reestablished, informs an eNB, which radio link failure (RLF) of the UE occurred, about that the cause of UE's RLF was IDC interference.