Relay Access Point Identifier Management for WLAN Range Extension
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Solution Overview
Problem
Wireless local area networks (WLANs) operating in the sub-1 GHz band face challenges due to limited spectrum allocation, fragmented channels, and narrow bandwidths, which restrict data rates and support for high-density scenarios, necessitating innovative solutions for efficient data transmission and relay operations.
Innovation Solution
The implementation of a relay access point (R-AP) system that assigns new identifiers to end-stations, facilitates traffic indication map indications, and communicates with a root access point to manage information fields and acknowledgments, enabling efficient data transmission and relay operations in limited bandwidth conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If relay operations are implemented to extend coverage, then range is improved, but device complexity increases due to additional identifier management and traffic indication mechanisms
Solution Approach 1:
The patent segments the network into relay access points and root access points, with each segment managing its own identifiers and traffic indications independently. This segmentation allows range extension while containing complexity within manageable boundaries.
Solution Approach 2:
The relay access point acts as an intermediary between end-stations and root access points, managing traffic indication maps and identifiers to facilitate communication without requiring direct complex coordination between all nodes.
2Productivity
If traffic indication map indications are added for new end-stations, then data transmission efficiency is improved, but message size and processing complexity increase
Solution Approach 1:
The traffic indication map is updated in advance with indications for new end-stations before data transmission begins, allowing efficient data retrieval without requiring complex real-time processing during actual communication.
Solution Approach 2:
The system uses feedback mechanisms where the root access point receives information about new end-stations and adjusts traffic indication maps accordingly, enabling efficient data transmission through iterative refinement rather than complex one-time calculations.
3Reliability
If relay access points manage multiple end-stations with unique identifiers, then reliability is improved, but loss of information increases due to additional message fields
Solution Approach 1:
The patent implements nested identifier structures where end-station identifiers are contained within relay access point contexts, which are in turn contained within the overall network topology managed by root access points. This nesting allows reliable identification without proportionally increasing information overhead.
Solution Approach 2:
Each relay access point maintains local traffic indication maps with specific identifiers for its associated end-stations, allowing reliable local management without requiring all network nodes to process the same amount of information.
Data Source
AI summary
A method performed by STA may comprise receiving, from a first AP, a first beacon frame comprising a first relay information element including a first field that indicates whether a root AP BSSID field is included in the first relay information element, determining that a first root AP BSSID field is included in the first relay information element and determining that the first AP is a relay AP of a root AP identified by the first root AP BSSID field. The method may further comprise receiving, from a second AP, a second beacon frame comprising a second relay information element including a second field that indicates whether a root AP BSSID is included in the second relay information element and determining that a root AP BSSID field is not included in the second information element and determining that the second AP is a root AP.