LTE-ISM Interference Handling via Subframe Reservation
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Solution Overview
Problem
In-device co-existence interference occurs in wireless communication environments due to the close operating frequencies and limited isolation between LTE and ISM modules in user equipment, causing interference between LTE and ISM technologies such as Bluetooth, Wi-Fi, and GNSS, especially in small form factor devices.
Innovation Solution
A method and apparatus that detect in-device co-existence interference between LTE and ISM modules, identify affected subframes and HARQ processes, reserve these for LTE operation, and indicate to the base station to resolve interference, using techniques like DRX parameter determination and unified signaling to schedule interference-free time for both modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE and ISM modules operate simultaneously in adjacent bands, then user equipment can support multiple wireless technologies (Bluetooth, Wi-Fi, GNSS), but in-device co-existence interference occurs due to small frequency separation
Solution Approach 1:
The patent segments the time domain by identifying and reserving specific subframes for LTE operation when interference with ISM modules is detected. This temporal segmentation allows LTE and ISM technologies to operate in different time slots, eliminating simultaneous interference while maintaining support for both technologies.
Solution Approach 2:
The patent performs preliminary identification of subframes that will be affected by ISM module operation before actual interference occurs. By proactively reserving these subframes for LTE and notifying the base station in advance, the system prevents interference rather than reacting to it after occurrence.
2Reliability
If subframes are reserved for LTE operation to resolve interference, then LTE communication reliability improves, but scheduling flexibility and resource utilization may be reduced
Solution Approach 1:
The patent implements dynamic subframe reservation where the base station receives notifications about affected subframes and can adapt its scheduling patterns accordingly. This dynamic approach allows the system to maintain LTE reliability in protected subframes while preserving scheduling flexibility in non-reserved subframes, optimizing resource utilization based on real-time interference conditions.
Data Source
AI summary
The present disclosure provides a method and apparatus of handling in-device co-existence interference in a wireless communication environment. In one embodiment, a method includes detecting in-device co-existence interference between a LTE module and an ISM module in user equipment. The method further includes identifying subframes and corresponding HARQ processes in a set of subframes allocated to the LTE module which are affected by the ISM module operation. Additionally, the method includes reserving the remaining subframes and corresponding HARQ processes in the set of subframes for the LTE module operation. Furthermore, the method includes indicating to a base station that the remaining subframes and the corresponding HARQ processes are reserved for the LTE module operation to resolve the in-device co-existence interference. Moreover, the method includes receiving scheduling pattern indicating subframes and corresponding HARQ processes reserved for the LTE operation or derived DRX parameters from the base station based on the indication.