LTE Downlink Power Control for WiFi Coexistence
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Solution Overview
Problem
LTE wireless communication systems operating in the same RF band as WiFi systems face interference due to their continuous downlink channel operation, which hinders coexistence with other radio access technologies like WiFi, as WiFi systems have limited chance to sense a clear channel for transmission.
Innovation Solution
The LTE system includes a processor that detects uplink communications from user equipment (UE), estimates the UE's location, determines communication capability, and downgrades downlink communications to minimize interference with WiFi systems by adjusting power levels, modulation schemes, and antenna radiation patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LTE downlink channels operate continuously at pre-defined power level, then coverage requirements are met, but interference with WiFi systems increases
Solution Approach 1:
The patent implements dynamic downlink power control where the base station continuously adjusts transmit power based on real-time channel conditions and UE locations. Instead of operating at a fixed pre-defined power level, the system dynamically modifies power levels to maintain coverage while reducing interference to WiFi systems in adjacent channels.
Solution Approach 2:
The system changes the power level parameter of downlink transmissions based on detected channel conditions. By monitoring WiFi interference levels and UE reception quality, the base station adjusts the transmit power parameter to optimize the trade-off between coverage reliability and interference mitigation.
2Adaptability or versatility
If LTE operates in unlicensed RF bands, then spectrum utilization improves, but coexistence with WiFi becomes challenging
Solution Approach 1:
The patent enables LTE to dynamically adapt its transmission characteristics when operating in unlicensed bands. The base station continuously monitors channel occupancy and WiFi activity, adjusting LTE transmission parameters in real-time to coexist with WiFi systems while utilizing the unlicensed spectrum resource.
Solution Approach 2:
The system implements periodic channel sensing and power adjustment cycles. The base station periodically detects channel conditions, assesses WiFi interference levels, and adjusts downlink power accordingly, creating a rhythmic pattern of transmission that respects WiFi coexistence requirements while maintaining LTE service.
3Object-affected harmful factors
If downlink power is reduced to mitigate WiFi interference, then coexistence improves, but data rate may be compromised
Solution Approach 1:
The system jointly optimizes multiple parameters including transmit power, modulation scheme, and coding rate. When power is reduced to mitigate WiFi interference, the system compensates by adjusting modulation and coding parameters to maintain data rate requirements, ensuring both coexistence and productivity are satisfied.
Solution Approach 2:
The patent implements a feedback mechanism where the base station monitors both WiFi interference levels and UE data rate requirements. Based on this feedback, the system adjusts power and other transmission parameters to maintain the required data rate while keeping interference to WiFi within acceptable limits.
Data Source
AI summary
Systems and methods presented herein provide for altering communications of a LTE wireless communication system operating in an RF band with a conflicting WiFi system. In one embodiment, an LTE system includes a wireless base station operable to transmit downlink communications to a UE in the RF band and to receive uplink communications from the UE in the RF band. The LTE system also includes a processor operable to detect the uplink communications from the UE, to estimate a location of the UE based on the detected uplink communications, to determine a communication capability between the UE and the wireless base station based on the location of the UE, and to downgrade the downlink communications from the wireless base station to the UE based on the determined communication capability to avoid interference with the WiFi communication system.