LTE-U Termination for WLAN Coexistence on Unlicensed Bands
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Solution Overview
Problem
The coexistence of WLAN and LTE-U in the same device on the same unlicensed band leads to interference issues, causing performance degradation and unpredictable behavior due to overlapping frequencies, making simultaneous operation undesirable.
Innovation Solution
A method to detect WLAN activation and determine whether to terminate the ongoing LTE-U connection on the unlicensed band, allowing the network to move LTE-U services to a licensed band or another radio access technology, ensuring seamless coexistence by informing the eNB to terminate the LTE-U data connection and reconfigure the UE to support WLAN on non-overlapping bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If WLAN and LTE-U operate simultaneously on the same unlicensed band, then spectral resource utilization is improved, but interference and performance degradation occur
Solution Approach 1:
The patent implements dynamic band selection and connection management where the system continuously monitors WLAN activation status and automatically adjusts LTE-U operation accordingly. The eNB receives indication messages about WLAN activation and dynamically terminates or maintains LTE-U connections based on current spectral availability, enabling adaptive resource utilization without fixed allocation.
Solution Approach 2:
The system performs preliminary detection of WLAN activation status before establishing or maintaining LTE-U connections. The UE or eNB detects WLAN activation indications in advance and proactively manages LTE-U connections to prevent interference, rather than reacting after interference occurs. This preemptive approach ensures seamless coexistence by preparing the network state beforehand.
2Reliability
If LTE-U connection is terminated to allow WLAN activation, then interference is prevented, but network connectivity continuity may be affected
Solution Approach 1:
The patent implements a feedback mechanism where the UE sends indication messages to the eNB about WLAN activation status. The eNB uses this feedback information to make informed decisions about LTE-U connection management. This closed-loop feedback ensures that connection termination occurs only when necessary and allows for potential reactivation when WLAN is no longer active, maintaining overall connectivity continuity.
Solution Approach 2:
The system temporarily discards the LTE-U connection when WLAN activation is detected to prevent interference, but maintains the capability to recover and reestablish the LTE-U connection when WLAN is no longer active. This discard-and-recover approach allows the system to prioritize WLAN operation when needed while preserving LTE-U connectivity for future use, ensuring both interference prevention and connection continuity.
Data Source
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AI summary
In accordance with an example embodiment of the present invention, an apparatus comprising: at least one processor; and at least one memory including computer program code, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to perform at least the following: detect an indication for a local area network activation; and determine whether or not to terminate a wide area network connection on an unlicensed band in an instance in which the wide area network connection on the unlicensed band is active and the local area network operates on the same unlicensed band.