Station Sleep Mode During Wireless Back-Off Period
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Solution Overview
Problem
Contention-based multiple access protocols in wireless communication networks lead to energy wastage due to continuous channel monitoring during back-off periods, as devices wait for the channel to become idle before transmitting.
Innovation Solution
A method where a station determines a back-off period and enters a sleep mode for a calculated sleep period, based on the back-off period, delay, and idle duration, reducing energy consumption by minimizing awake time during channel access delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the station continuously monitors the channel status during the back-off period, then the station can detect channel availability in real time, but the energy consumption increases
Solution Approach 1:
The station performs preliminary channel monitoring before the back-off period to determine if the channel is occupied, then enters sleep mode during the back-off period. This preliminary action allows the station to avoid continuous monitoring while ensuring it wakes up at the correct time to access the channel when available.
Solution Approach 2:
Instead of continuous monitoring, the station employs periodic action by entering sleep mode during the back-off period and waking up at specific intervals or at the end of the back-off period to check channel availability. This periodic monitoring significantly reduces energy consumption while maintaining the ability to detect channel status when needed.
2Use of energy by moving object
If the station enters sleep mode during the back-off period, then the energy consumption is reduced, but the channel monitoring capability is temporarily lost
Solution Approach 1:
The station performs preliminary monitoring to determine channel occupancy status before entering sleep mode. It also sets the wake-up time based on the back-off period duration, ensuring that the station wakes up exactly when needed to access the channel, thus maintaining reliability while reducing energy consumption during the sleep period.
Solution Approach 2:
The station uses feedback from the initial channel assessment and back-off period calculation to determine the optimal sleep duration and wake-up time. This feedback mechanism ensures that the station wakes up at the precise moment when channel access is permitted, maintaining system reliability without requiring continuous monitoring.
3Loss of time
If the station wakes up early during the back-off period, then the channel can be accessed sooner if idle, but the energy savings from sleep mode are reduced
Solution Approach 1:
The station performs preliminary monitoring and calculates the exact back-off period duration before entering sleep mode. This preliminary action allows the station to determine the precise wake-up time when channel access is permitted, avoiding both premature wake-up (which would waste energy) and delayed wake-up (which would increase access delay).
Solution Approach 2:
The station dynamically adjusts its sleep duration based on the calculated back-off period and channel conditions. By making the sleep period dynamic rather than fixed, the station optimizes the balance between energy savings and channel access timing, waking up exactly when the back-off period expires and channel access is permitted.
Data Source
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AI summary
The present disclosure relates to a technique of supporting access to a wireless medium of a wireless communication network. A method embodiment comprises: when access of a station (100) to the wireless medium is delayed, determining (S202; S308), by the station, a back-off period indicating the period of time the access of the station to the wireless medium is delayed, and entering (S204; S312), by the station (100), into a sleep mode for a sleep period based on the determined back-off period.