WLAN ACK Power Adjustment for LTE Coexistence
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Solution Overview
Problem
Conventional LTE systems face coexistence issues due to interference between LTE uplink signals and Bluetooth or WLAN signals, leading to power imbalances and inefficient data rates, as existing interference estimation methods are inadequate and often result in 'ping-pong' handover effects and power loop malfunctions.
Innovation Solution
Transmitting WLAN acknowledgement (ACK) packets at a higher power level than data packets and selecting an independent ACK packet transmit rate to mitigate power imbalances, thereby reducing interference and improving data rate stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LTE uplink transmission power is increased to improve data rate, then data rate improves, but interference with Bluetooth/WLAN signals increases
Solution Approach 1:
The patent implements dynamic transmit power adjustment where the LTE uplink power is continuously adapted based on real-time detection of Bluetooth/WLAN signal interference. The system monitors interference levels and adjusts LTE power dynamically to maintain data rate while minimizing harmful interference to other radio technologies.
Solution Approach 2:
The patent changes the transmit power parameter of LTE uplink based on detected interference conditions. By monitoring Bluetooth/WLAN signal quality and adjusting LTE power accordingly, the system optimizes the balance between maintaining productive data transmission and reducing harmful interference effects on co-located radio technologies.
2Object-generated harmful factors
If interference estimation methods are used to reduce interference, then interference with other radios decreases, but power loop malfunctions and ping-pong handover effects occur
Solution Approach 1:
The patent implements a feedback mechanism where Bluetooth/WLAN signal quality is continuously monitored and this information feeds back to adjust LTE uplink power. The feedback loop includes hysteresis and threshold-based control to prevent oscillations and ping-pong effects, ensuring stable operation by maintaining interference reduction without causing system instability or unnecessary power adjustments.
3Adaptability or versatility
If LTE operates in ISM adjacent bands to provide cellular service, then cellular coverage is improved, but coexistence issues with Bluetooth and WLAN arise
Solution Approach 1:
The patent applies local quality by implementing interference management specifically in the ISM adjacent bands where coexistence issues occur. The system detects Bluetooth/WLAN signals locally and applies targeted power adjustment only in affected frequency regions and time periods, allowing LTE to maintain full cellular coverage capability while locally mitigating interference with Bluetooth/WLAN operations.
Data Source
AI summary
A method for mitigating the impact of a power imbalance on a remote data rate in a wireless local area network (WLAN) includes transmitting a wireless local area network (WLAN) acknowledgement (ACK) packet at a first transmit power level to a remote device. The method further includes transmitting, to the remote device, a WLAN data packet at a second transmit power level that is lower than the first transmit power level of the WLAN ACK packet. Another method for mitigating the impact of a power imbalance on a remote data rate in a wireless local area network (WLAN) may include selecting a wireless local area network (WLAN) acknowledgement (ACK) packet transmit rate independent from a rate at which a WLAN data packet is received. This method further includes transmitting, to a remote device, a WLAN ACK packet at the selected WLAN ACK packet transmit rate.