Dynamic EDCA Parameter Adjustment for M2M Power Reduction
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Solution Overview
Problem
In wireless communication systems, particularly in IEEE 802.11 WLANs, the increasing number of devices in M2M communication scenarios leads to inefficiencies in channel access mechanisms, resulting in increased power consumption and interference, necessitating a more efficient method to manage access and reduce unnecessary power usage.
Innovation Solution
A method where an access point (AP) in a wireless communication system determines whether to transmit information related to stopping Enhanced Distributed Channel Access (EDCA) to a Station (STA) based on various criteria, including uplink signal quality, transmission attempt counts, and data availability, allowing for dynamic adjustment of access methods to optimize channel usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of devices in M2M communication increases, then more devices can be connected to the network, but channel access efficiency deteriorates leading to increased power consumption and interference
Solution Approach 1:
The patent implements dynamic adjustment of EDCA parameters (transmission opportunity count, contention window size, backoff exponent) based on real-time channel conditions and device status. The AP monitors uplink signal quality, transmission attempt counts, and data availability to dynamically modify access parameters, enabling the system to adapt to varying network conditions and device densities, thereby reducing unnecessary transmissions and power consumption.
Solution Approach 2:
The patent changes key EDCA parameters including the number of transmission opportunities (TXOP), contention window (CW) size, and backoff exponent based on device performance metrics such as uplink signal quality (MCS level, RSSI), transmission attempt counts, and data discard reports. These parameter adjustments optimize channel access efficiency for different device conditions, reducing power consumption while maintaining connectivity for large numbers of devices.
2Quantity of substance
If the number of devices in M2M communication increases, then more devices can be connected to the network, but interference occurrence increases
Solution Approach 1:
The system dynamically adjusts EDCA parameters based on real-time channel conditions monitored by the AP. When interference levels increase due to higher device density, the system modifies transmission opportunity counts, contention window sizes, and backoff exponents to space out transmissions and reduce collision probability, thereby mitigating interference while maintaining device connectivity.
Solution Approach 2:
The patent implements feedback mechanisms where STAs report data discard status, transmission attempt counts, and channel conditions to the AP. The AP uses this feedback to adjust EDCA parameters for individual STAs or groups, optimizing channel access to reduce interference. The feedback loop enables continuous optimization of channel access efficiency as device density and interference conditions change.
3Productivity
If EDCA transmission opportunities are increased for better access efficiency, then channel utilization improves, but power consumption increases due to unnecessary transmissions
Solution Approach 1:
The patent adjusts the number of transmission opportunities (TXOP) parameter based on STA-specific conditions including uplink signal quality (MCS level, RSSI), transmission attempt counts, and data availability status. STAs with poor channel conditions or no data to transmit receive fewer TXOP allocations, reducing unnecessary transmissions and power consumption, while STAs with good conditions and data receive more opportunities to improve channel utilization efficiency.
Solution Approach 2:
The system applies partial transmission opportunities based on actual need rather than providing full TXOP to all STAs uniformly. By evaluating data discard reports and transmission attempt counts, the AP allocates TXOP partially to STAs that actually have data to transmit and good channel conditions, avoiding excessive transmissions from STAs with no data or poor conditions, thereby balancing channel efficiency with power consumption.
Data Source
AI summary
According to one embodiment of the present invention, a method by which an access point (AP) transmits and receives a frame in a wireless communication system comprises the steps of: receiving, from STA, an uplink signal including predetermined information; determining whether to transmit, to the STA, information related to the stopping an EDCA, on the basis of the predetermined information and/or the uplink signal; and transmitting, to the STA, the information related to the stopping of an EDCA when the information related to the stopping of an EDCA is determined to be transmitted to the STA.