BSS Color Identification in Wireless LAN ESS Management
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Solution Overview
Problem
In wireless LAN systems, existing technologies face challenges in distinguishing signals from the same extended service set (ESS) from those of overlapping BSSs, leading to increased collisions and inefficient communication due to the inability to accurately identify BSS Color information without decoding all frames, and managing BSS identification information is difficult with changing ESSIDs.
Innovation Solution
The introduction of BSS Color information and ESS Color mask information, where the AP notifies STA with its own BSS Color information and ESS Color mask information, allowing STA to differentiate between signals from its own ESS and OBSS by decoding the physical header, and managing BSS Color information for other APs in the same ESS using a bit mask format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the STA decodes all frames to identify BSS Color information, then the identification accuracy is improved, but the communication efficiency deteriorates due to increased processing time and energy consumption
Solution Approach 1:
The patent extracts only the essential BSS Color information from the physical header of frames, allowing the STA to identify the BSS without decoding the entire frame. This selective extraction of critical information resolves the contradiction by enabling accurate BSS identification while avoiding the time and energy costs of full frame decoding.
Solution Approach 2:
The BSS Color information is placed in the physical header of frames, which is decoded before the main frame body. This preliminary placement allows the STA to identify the BSS early in the reception process, enabling efficient filtering and decision-making without waiting for complete frame decoding.
2Measurement precision
If the ESSID is changed to manage different BSSs, then the BSS identification is improved, but the system complexity deteriorates due to the need to reset parameters and reconfigure devices
Solution Approach 1:
The patent introduces BSS Color as an alternative parameter for BSS identification that can be changed independently of the ESSID. This allows different BSSs to be distinguished through BSS Color values while maintaining the same ESSID, eliminating the need to reset parameters and reconfigure devices when adding or modifying BSSs.
Solution Approach 2:
The patent separates the BSS identification function from the ESSID by introducing a dedicated BSS Color parameter. This segmentation allows the ESSID to remain constant for an ESS while BSS Color values differentiate individual BSSs, simplifying the management of multiple BSSs within the same ESS.
3Reliability
If the STA treats all received frames as OBSS, then the collision avoidance is improved, but the communication efficiency deteriorates due to unnecessary deferment of transmission
Solution Approach 1:
The patent applies different treatment to different types of received frames based on their BSS Color information. Frames with the same BSS Color as the transmitting STA are treated as intra-BSS frames and do not trigger deferment, while frames with different BSS Colors are treated as OBSS frames. This localized differentiation resolves the contradiction by avoiding unnecessary deferment of transmissions to same-BSS frames while still protecting against collisions with OBSS frames.
Data Source
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Figure 3(a)~3(f)
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AI summary
Provided are a communication device and a communication method which are capable of performing an operation suitably with a basic service set belonging to an extended service set. An AP notifies of BSS Color information of its own device together with information for specifying the BSS Color information to be managed. Upon receiving the notification, an STA identifies BSS Color information used in the same ESS and BSS Color information used in an OBSS not belonging to the ESS, and deals with signals from other BSSs in the same ESS, in accordance with signals from the BSS of its own device.