CBQR Format with BSS Availability for Multi-AP Coordination
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Solution Overview
Problem
The existing bandwidth query report (BQR) format in IEEE 802.11 wireless networking standards only allows a station (STA) to provide BQR information for its associated basic service set (BSS) to the access point (AP), limiting the ability of the AP to coordinate subchannel allocation in multi-AP scenarios, where information about overlapping BSSs (OBSSs) is also necessary for efficient multi-user operations.
Innovation Solution
Introduce a coordinated bandwidth query report (CBQR) format that enables a STA to provide BQR information for multiple BSSs, including both its associated BSS and OBSSs, by transmitting multiple CBQR fields within an aggregated control field of a frame, each containing a BSS color field and an available channel bitmap field to indicate subchannel availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing BQR format is used, then the STA can provide subchannel availability information for its associated BSS to the AP, but the AP cannot obtain subchannel availability information for OBSSs, limiting multi-AP coordination capability
Solution Approach 1:
The BQR message is segmented into multiple BQR fields, where each BQR field contains a BSS color field and an available channel bitmap field. This segmentation allows the STA to report subchannel availability information for multiple different BSSs (including both associated BSS and OBSSs) within a single BQR message, enabling the AP to obtain comprehensive coordination information without losing data about OBSSs
Solution Approach 2:
The BQR message structure is enhanced to serve multiple functions: it can report subchannel availability for the STA's associated BSS, OBSSs, and potentially other BSSs of interest. By making the BQR message universal across different BSS contexts through the addition of BSS color identification in each BQR field, the system enables multi-AP coordination while maintaining backward compatibility with existing single-BSS reporting functionality
2Adaptability or versatility
If multiple BQR fields are transmitted to provide comprehensive subchannel information, then multi-AP coordination is enabled, but the frame structure complexity increases
Solution Approach 1:
The complex information requirement is segmented into multiple standardized BQR fields, each with a consistent internal structure (BSS color field + available channel bitmap field). This segmentation approach manages complexity by breaking down the multi-BSS reporting requirement into repeatable, modular units rather than creating a single complex structure
Solution Approach 2:
The frame structure uses parameter changes to control complexity: the number of BQR fields is dynamically adjustable based on coordination needs, and each field's BSS color parameter identifies which BSS the information pertains to. This parameter-based approach allows flexible adaptation to different multi-AP scenarios without requiring fundamentally different frame structures
Data Source
AI summary
An embodiment is a method performed by a station (STA) to provide a coordinated bandwidth query report (CBQR) to an access point (AP). The method includes generating a frame that includes an aggregated control (A-control) field, wherein the A-control field includes a CBQR field, wherein the CBQR field includes a basic service set (BSS) color field that carries a BSS color of a BSS and an available channel bitmap field that carries a bitmap indicating subchannel availability at the STA with respect to the BSS. The method further includes transmitting the frame to the AP.