Listen Interval Update for Wireless LAN Device Power Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In machine-to-machine (M2M) communication within IEEE 802.11 WLAN systems, the increasing number of devices leads to prolonged channel access times, deteriorating overall system performance and power consumption, as existing listen interval mechanisms are inadequate for managing large numbers of devices with occasional low-speed data transmissions.
Innovation Solution
A method and apparatus for updating the listen interval in wireless communication systems, specifically allowing stations (STAs) and access points (APs) to dynamically adjust and manage listen intervals, enabling efficient channel access and power management by grouping Association IDs (AIDs) and using Listen Interval Update frames to synchronize wake-up times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of devices increases in M2M communication, then the network coverage and device connectivity are improved, but the channel access time increases and system performance deteriorates
Solution Approach 1:
The patent segments the large number of devices into multiple groups based on their AIDs. Each group is assigned a specific listen interval, dividing the channel access into multiple segments rather than having all devices compete simultaneously. This segmentation reduces the contention overhead and channel access time for individual devices while supporting a larger total number of connected devices.
2Reliability
If devices perform frequent channel access to ensure data transmission, then the data reliability is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic listen interval adjustment where each device's listen interval is dynamically configured based on its AID group and communication requirements. Devices can adjust their wake-up frequency adaptively - devices with urgent data needs have shorter listen intervals for higher reliability, while devices with occasional transmissions use longer intervals to save power. This dynamic mechanism balances reliability and power consumption for different device types.
Solution Approach 2:
The patent changes the listen interval parameter based on device characteristics and communication patterns. By assigning different listen interval values to different AID groups, the system optimizes the balance between channel access frequency (affecting reliability) and power consumption. Devices transition between different listen interval states depending on their operational requirements.
3Device complexity
If devices use fixed listen interval mechanisms, then the implementation simplicity is maintained, but the adaptability to different device requirements decreases
Solution Approach 1:
The patent segments devices into multiple AID groups with different listen interval characteristics. This segmentation provides adaptability to different device requirements while maintaining relatively simple implementation - each group follows a predefined listen interval pattern rather than requiring complex individual negotiation. The segmentation approach balances simplicity and adaptability by categorizing devices into manageable groups.
Solution Approach 2:
Different AID groups are assigned different listen interval values tailored to their specific communication needs. This local quality approach allows the system to optimize for different device types (e.g., power-sensitive M2M devices vs. real-time communication devices) without requiring a completely complex negotiation mechanism for each device. Each group receives localized optimization appropriate to its requirements.
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
Disclosed are a method and an apparatus for updating a listen interval in a wireless communication system. To this end, a method for updating a listen interval by a station (STA) of a wireless communication system may comprise, if an operation mode of the station is changed, a request frame including information indicating that the operation mode of the station is changed, to an access point (AP); and receiving a response frame in response to the request frame from the AP. If a value of a listen interval of the station is changed as the operation mode of the station is changed, the request frame further include a value of a new listen interval of the station.