Wireless Channel Access Method Using Competitive Index
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Solution Overview
Problem
In wireless local area network (WLAN) technologies, the increased number of terminals competing for channel access leads to intense competition, resulting in reduced connection speeds and increased power consumption due to high collision rates and retransmissions, especially in environments like smart grids and sensor networks.
Innovation Solution
A wireless channel access method that generates random values for access attempts based on competitive indices received from an access point, allowing terminals to determine whether to attempt access by comparing these values with channel competition metrics such as collision rates and request frequencies, and adjusting these values and time periods to alleviate competition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If terminals use CSMA/CA for wireless channel access, then basic wireless communication is enabled, but connection speed decreases and power consumption increases when thousands of terminals simultaneously attempt to connect
Solution Approach 1:
The access point performs preliminary actions by calculating and transmitting a competitive index before terminals attempt channel access. This allows terminals to make informed decisions about whether to attempt access, reducing unnecessary transmissions and improving overall connection efficiency while reducing power consumption.
Solution Approach 2:
The system implements feedback through the competitive index mechanism. The access point monitors channel conditions and provides feedback to terminals via the competitive index, which terminals use to adjust their access behavior. This feedback loop optimizes channel access efficiency and reduces power consumption by preventing futile access attempts.
2Reliability
If terminals wait for predetermined time periods before accessing the channel, then collision probability is reduced, but connection speed decreases due to increased waiting time
Solution Approach 1:
The waiting time is made dynamic through the competitive index mechanism. Instead of using fixed backoff times, terminals calculate their waiting period based on the competitive index received from the access point. This dynamic adjustment allows terminals to wait longer when channel conditions are poor and access more quickly when conditions are favorable, optimizing both collision reduction and connection speed.
3Reliability
If the contention window is increased to reduce collisions, then reliability improves, but the time required for successful data transmission increases
Solution Approach 1:
The system changes the parameter used for collision avoidance from fixed contention window sizes to a dynamic competitive index. The competitive index is calculated based on current channel conditions and terminal characteristics, allowing the system to adaptively adjust access parameters. This enables optimal balance between collision avoidance and transmission delay by tailoring the backoff behavior to specific channel conditions rather than using conservative fixed values.
Data Source
AI summary
The method performed in the terminal includes generating a random value for wireless channel access, receiving a competitive index indicating a channel competition state from an access point, and determining whether to attempt a wireless channel access based on a comparison result between the random value and the competitive index.Accordingly, in an environment in which a large number of wireless local area network (WLAN) terminals simultaneously attempt the wireless channel access, each terminal voluntarily restricts a wireless connection request in accordance with wireless channel environment information transmitted by an access point, that is, competitive indexes, and therefore wireless channel access competition may be alleviated, thereby improving a wireless connection speed of the terminal and reducing power consumption of the terminal.