WLAN Station Group Management via TIM Mode 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), optimizing channel access, power saving, and sector allocation, particularly in supporting a larger number of STAs and diverse service types, while reducing collisions and enhancing transfer rates.
Innovation Solution
The method involves transmitting operating mode notification and request frames between stations (STAs) and access points (APs) to efficiently change operating modes, including TIM/non-TIM mode changes, service type changes, AID reallocation, STA group changes, and power save parameter adjustments, using frame structures and communication methods to facilitate these changes.
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 diverse STAs with various service types and power saving demands
Solution Approach 1:
The patent segments STAs into different groups based on their service types and characteristics. Each STA group is assigned a specific Group ID, allowing the AP to manage diverse STAs through organized groups rather than individually, thus supporting versatility while reducing management complexity.
Solution Approach 2:
The patent creates a universal STA group management mechanism that can handle multiple service types (sensor terminals, offloading terminals, etc.) and power saving demands through a single group-based framework. This multi-functional approach allows the system to accommodate diverse STA types without requiring separate management mechanisms for each type.
2Quantity of substance
If WLAN systems increase the number of supported STAs, then the coverage and capacity expand, but channel access collisions increase
Solution Approach 1:
The patent divides STAs into different groups with distinct Group IDs. This segmentation allows the AP to manage channel access more effectively by controlling transmissions from different groups, thereby reducing collisions that would occur with a large number of unorganized STAs accessing the channel simultaneously.
Solution Approach 2:
The patent applies different management qualities to different STA groups. Each group can have customized parameters such as power saving settings, channel access priorities, and transmission schedules tailored to their specific characteristics, which helps optimize channel access and reduce collisions for each group while supporting a large total number of STAs.
3Loss of energy
If WLAN systems implement efficient power saving for multiple STAs, then energy consumption is reduced, but the complexity of power save parameter management increases
Solution Approach 1:
The patent groups STAs with similar power saving requirements together. By assigning Group IDs to STAs with comparable characteristics, the AP can manage power save parameters at the group level rather than individually for each STA, thus reducing energy consumption across multiple STAs while simplifying the management complexity.
Solution Approach 2:
The patent implements a universal power save management mechanism that works across all STA groups. The AP can send power save parameters and control transmissions to multiple groups using a standardized approach, enabling efficient power saving for diverse STA types without requiring separate complex management procedures for each group.
4Reliability
If WLAN systems allocate AIDs to individual STAs, then each STA can be uniquely identified, but efficient STA group management becomes difficult
Solution Approach 1:
The patent introduces a two-level identification system: Group ID for group-level identification and AID for individual STA identification within the group. This segmentation allows the system to maintain unique identification for each STA while enabling efficient group management, as the AP can reference entire groups by Group ID when group-level control is sufficient.
Solution Approach 2:
The patent merges the identification functions by combining Group ID and AID into a unified identification framework. The Group ID provides coarse-grained identification for group management, while the AID provides fine-grained identification for individual STAs. This combination allows efficient group management while maintaining reliable individual STA identification when needed.
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.