Inter-Packet Power Measurement for Wireless Interference Remediation
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Solution Overview
Problem
Wireless communication performance is degraded due to interference from 'hidden nodes' and overlapping channels in wireless local area networks, leading to increased packet error rates and latency.
Innovation Solution
A transmitting electronic device measures inter-packet received power and performs remedial actions such as selecting modulation techniques, antenna patterns, reducing transmit power, and determining cumulative distribution functions to maintain communication performance, even in the presence of interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmitting electronic devices continue transmission when interference is below threshold levels, then communication throughput is maintained, but packet error rate increases and communication reliability deteriorates
Solution Approach 1:
The system performs preliminary measurement of received power during inter-packet time intervals before actual data transmission. By measuring the received power level in advance and comparing it to threshold values, the system determines whether to proceed with transmission or wait, thereby preventing packet errors before they occur rather than dealing with them after transmission
Solution Approach 2:
The system continuously monitors received power levels and uses this feedback to dynamically adjust transmission decisions. The measured received power is compared to threshold values to determine whether to transmit, wait, or perform remedial actions, creating a closed-loop control system that adapts to changing interference conditions in real-time
2Reliability
If transmitting electronic devices perform remedial actions to reduce interference impact, then communication reliability improves, but transmission latency increases
Solution Approach 1:
The system dynamically adjusts its behavior based on measured interference conditions. When received power is below the first threshold, the system transmits immediately without remedial actions. When received power exceeds the threshold, the system dynamically switches to performing remedial actions such as waiting for a specified duration or selecting different modulation techniques, thereby adapting transmission strategy to current channel conditions
Solution Approach 2:
The system changes transmission parameters based on interference levels. When interference is detected (received power exceeds threshold), the system may change modulation techniques, adjust transmit power, or modify timing parameters. These parameter changes allow the system to maintain reliable communication under varying interference conditions while minimizing the impact on latency
3Measurement precision
If transmitting electronic devices measure received power during inter-packet intervals, then interference detection accuracy improves, but device complexity increases
Solution Approach 1:
The system uses the idle inter-packet time intervals that already exist in the communication protocol to perform measurements. Rather than requiring additional dedicated measurement time or resources, the system utilizes the natural gaps between packet transmissions to measure received power, thereby obtaining accurate interference information without adding extra overhead or complexity to the communication system
Data Source
AI summary
In order to maintain performance during wireless communication, a transmitting electronic device may selectively perform a remedial action based on a received power in a channel during time intervals between received packets (e.g., due to interference) and/or a metric associated with the measured received power. In particular, when the received power is less than a threshold value (e.g., when the interference is insufficient to stop transmission by the transmitting electronic device), the transmitting electronic device performs the remedial action based on the measured received power and/or the metric. For example, the remedial action may include: selecting a modulation technique; selecting the receiving electronic device; selecting an antenna pattern for the one or more antennas; reducing a transmit power; selecting a data rate; determining a cumulative distribution function; and/or estimating a channel capacity. Next, the transmitting electronic device transmits a packet in the channel to a receiving electronic device.