Reduced Neighbor Report Element for Multi-Link Device Discovery
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Solution Overview
Problem
Non-AP STAs in multi-link device (MLD) networks face challenges in discovering APs with multiple Basic Service Set Identifiers (BSSIDs) due to the lack of information in beacon frame transmissions, which affects association and management frame handling.
Innovation Solution
The implementation of a Reduced Neighbor Report (RNR) system that encodes MLD information, including BSSID indices, DTIM periods, and TBTT offsets, within management frames like beacon, probe response, or reassociation response frames to facilitate the discovery of all APs within a multiple BSSID set, ensuring proper association and frame handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If APs in MLD do not provide multiple BSSIDs information in beacon frame transmissions, then beacon frame transmissions remain simple and unchanged, but non-AP STAs cannot discover APs with multiple BSSIDs
Solution Approach 1:
The patent introduces a Reduced Neighbor Report (RNR) element as an intermediary structure within the beacon frame to carry MLD-related information. This RNR element acts as a mediator between the AP and non-AP STAs, providing the necessary discovery capability without fundamentally redesigning the beacon frame protocol. The RNR element includes fields for MLD MAC address, BSSID indices, and operational parameters, enabling STAs to discover multiple BSSIDs while maintaining beacon frame simplicity.
2Adaptability or versatility
If multiple BSSIDs information is added to beacon frames, then non-AP STAs can discover all APs within MLD, but beacon frame transmissions become more complex
Solution Approach 1:
The patent segments the MLD information into a separate Reduced Neighbor Report element within the beacon frame, rather than integrating it throughout the entire frame structure. This segmentation approach allows the beacon frame to maintain its core functionality while adding discovery capabilities through a dedicated, self-contained RNR element. The RNR element is positioned as a distinct information carrier, separating MLD-specific data from standard beacon frame content.
Solution Approach 2:
The patent implements a partial information disclosure approach by including only the essential MLD-related fields in the RNR element (MLD MAC address, BSSID indices, DTIM period, TBTT offset) rather than transmitting complete information for all APs. This partial action provides sufficient discovery capability for STAs to identify and associate with appropriate APs without overwhelming the beacon frame with excessive information, balancing versatility with frame simplicity.
3Ease of operation
If non-AP STAs receive beacon frames without MLD information, then frame processing remains simple, but association and management frame handling become problematic
Solution Approach 1:
The patent performs preliminary action by embedding MLD information in the RNR element before the STA needs to make association decisions. The beacon frame proactively provides the necessary MLD MAC address, BSSID indices, and operational parameters, allowing the non-AP STA to pre-identify suitable APs within the MLD. This preliminary information delivery eliminates the need for complex post-receipt analysis and enables straightforward association and management frame handling while ensuring accurate STA-AP pairing.
Data Source
AI summary
An access point (AP) multi-link device (MLD) (AP MLD) comprises a plurality of affiliated access points (APs) including a first affiliated AP (AP1) and a second affiliated AP (AP2). When the first affiliated AP (AP1) is configured to operate as a reporting AP, the reporting AP may encode MLD information in a management frame for transmission to one or more STAs of a station MLD (STA MLD). The MLD information may include a basic service set (BSS) identifier (ID) (BSSID) of the AP1 and may include a BSSID index of at least the AP2 when the AP2 is in a multiple BSSID (MBSSID) set that does not include the BSSID of the AP1. The MLD information may further include at least one of a delivery traffic indication map (DTIM) period of the AP2. The AP1 may decode a frame from a non-AP STA of the STA MLD that includes a BSSID of the MBSSID set for association or reassociation.