WLAN Operating Mode Change via TIM and AID Reallocation
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Solution Overview
Problem
Wireless local area network (WLAN) systems face challenges in efficiently managing various types of stations (STAs), reducing channel access collisions, and achieving power saving, especially in supporting a larger number of STAs and diverse service types in wireless wide area networks (WWANs.
Innovation Solution
An operating mode change method is introduced, involving the transmission of operating mode notification and request frames between stations (STAs) and access points (APs) to reallocate association identification (AID), change traffic indication map (TIM) modes, and adjust power save parameters, enabling efficient STA group management, channel access, and sector allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If WLAN systems use conventional STA management methods, then the system can support basic operations, but it cannot efficiently manage a large number of STAs with diverse service types and cannot achieve effective power saving
Solution Approach 1:
The patent segments STAs into different categories (sensor terminals, offloading terminals, etc.) with distinct service types, and introduces separate TIM structures (first TIM for sensor terminals, second TIM for offloading terminals) to manage each category independently. This segmentation allows efficient management of diverse STAs without overwhelming system complexity.
Solution Approach 2:
The patent implements dynamic TIM mode switching capability where STAs can transition between TIM and non-TIM modes based on their current operational state and power saving requirements. This dynamic adaptation allows the system to optimize performance for different service types while maintaining manageable complexity through standardized switching procedures.
2Area of stationary object
If WLAN systems accommodate more STAs to expand coverage, then the network coverage increases, but channel access collisions increase and power saving becomes more difficult to achieve
Solution Approach 1:
The patent divides the STA population into multiple categories with different service types and introduces separate TIM structures for each category. By segmenting STAs into sensor terminals and offloading terminals with dedicated TIMs, the system reduces channel access collisions as each group can be managed independently with optimized access parameters.
Solution Approach 2:
The patent applies different TIM modes and power saving parameters to different STA categories based on their specific requirements. Sensor terminals receive one type of TIM management while offloading terminals receive another, allowing localized optimization for each group's characteristics and reducing overall collision rates.
3Loss of time
If WLAN systems reduce link setup time, then the connection establishment speed increases, but the complexity of managing operating mode changes increases
Solution Approach 1:
The patent performs operating mode changes, TIM mode transitions, and parameter adjustments as preliminary actions during the link setup phase. By completing these configurations before full data transmission begins, the system reduces overall link setup time while managing complexity through standardized procedures executed during the initial connection establishment.
Data Source
AI summary
An operating mode change method of a wireless local area network (WLAN) system according to an exemplary embodiment includes transmitting, by a station (STA) to an access point (AP), an operating mode change request frame comprising at least one of information on a change of a traffic indication map (TIM) mode, a request for a change of a power save parameter, and information on a change of a service type of the STA, receiving, from the AP, an operating mode change response frame comprising at least one of a TIM mode allowed by the AP, a reallocated association identification (AID), and information on a changed power save parameter, and performing at least one of the change of the TIM mode and the change of the power save parameter based on the information included in the operating mode change.