LTE In-Device Coexistence via Predictive CCA Scheduling
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Solution Overview
Problem
Existing LTE devices face challenges in efficiently operating on both licensed and unlicensed carrier spectrums due to interference and regulatory requirements, particularly when coexisting with Wi-Fi systems.
Innovation Solution
The implementation of a method that coordinates wireless transmissions on one carrier with clear channel assessments on another carrier, involving techniques such as muting transmissions during CCA periods, adjusting CCA thresholds based on in-device interference, and relying on indications from base stations to determine channel availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LTE devices perform clear channel assessment (CCA) on unlicensed carriers to check for Wi-Fi transmissions, then coexistence with Wi-Fi systems is improved, but transmission efficiency on licensed carriers deteriorates due to interference from simultaneous transmissions
Solution Approach 1:
The device performs CCA on the unlicensed carrier before initiating transmission on the licensed carrier. By checking the unlicensed channel status in advance and predicting potential interference, the device can proactively adjust its licensed carrier transmission strategy, preventing interference before it occurs and maintaining both Wi-Fi coexistence and transmission efficiency
2Object-affected harmful factors
If LTE devices mute transmissions on licensed carriers during CCA periods on unlicensed carriers, then interference with CCA is reduced, but transmission continuity on licensed carriers deteriorates
Solution Approach 1:
The device performs CCA on the unlicensed carrier in advance before licensed carrier transmission. By predicting the CCA outcome and potential interference timing, the device can schedule licensed carrier transmissions to avoid overlapping with CCA periods, eliminating the need for muting and maintaining transmission continuity
Solution Approach 2:
The device dynamically adjusts its transmission strategy based on real-time CCA results and predicted interference conditions. Instead of static muting during fixed CCA periods, the device flexibly schedules licensed carrier transmissions according to actual channel conditions, maintaining both interference avoidance and transmission continuity
3Productivity
If LTE devices perform both CCA on unlicensed carriers and transmissions on licensed carriers simultaneously, then spectrum utilization is improved, but in-device interference increases causing transmission failures
Solution Approach 1:
The device performs CCA on the unlicensed carrier and predicts potential interference before initiating licensed carrier transmission. By having the capability to predict interference in advance, the device can make informed decisions about simultaneous operations, maintaining high spectrum utilization while avoiding in-device interference through predictive scheduling
Solution Approach 2:
The device uses feedback from CCA results and interference predictions to dynamically adjust its transmission strategy. By continuously monitoring channel conditions and predicting interference, the device can optimize simultaneous operations on both carriers, maintaining high spectrum utilization while preventing in-device interference through adaptive control
Data Source
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Figure 3
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AI summary
Methods and structures are disclosed which facilitate co-existence of Long Term Evolution (LTE) type communication signal reception and transmission using one carrier, such as a licensed carrier, and another carrier, such as an unlicensed carrier, in the presence of other transmissions using the other carrier.