Sync Beacon Frame Subtype for NAN Synchronization

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Solution Overview

Problem

Legacy devices in Neighbor Awareness Networking (NAN) confuse NAN devices with access points due to reused beacon formats, leading to synchronization issues, as they attempt to associate with NAN devices thinking they are access points, with no prior solution effectively addressing this problem.

Innovation Solution

NAN devices transmit Sync Beacons using either a Public Action frame with specific fields or a new frame subtype, defining a unique format to avoid confusion, including fields like Timestamp, NAN ID, Sync Beacon Interval, and Discovery Window Duration, ensuring proper synchronization without legacy device misinterpretation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If NAN devices use the existing beacon format for Sync Beacons, then the beacon transmission is simple and straightforward, but legacy devices confuse NAN devices with access points and attempt to associate with them, causing synchronization issues

Engineering Contradiction:

Improvebeacon transmission simplicityVSAvoidsynchronization reliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent segments the beacon transmission by creating two distinct beacon formats: one for legacy devices and one for NAN devices. The NAN Sync Beacon uses a new frame subtype (set to 6) and specific field structures that differ from traditional beacons, allowing NAN devices to transmit synchronization information without legacy devices misinterpreting them as access points. This segmentation resolves the contradiction by maintaining simplicity for NAN devices while ensuring reliability through format differentiation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by modifying specific fields within the beacon structure rather than changing the entire beacon format. The NAN Sync Beacon uses the same basic beacon structure but introduces specific local changes: setting frame subtype to 6, using Category 0x0A (Public Action), and including NAN-specific fields like NAN ID, Sync Beacon Interval, and Discovery Window. These localized modifications allow legacy devices to ignore NAN beacons while NAN devices can properly interpret them, resolving the association confusion issue.

Inventive Principle:

Principle #3Local quality

2Reliability

If a new frame subtype is defined for Sync Beacons, then legacy device misinterpretation is prevented, but the beacon format complexity increases

Engineering Contradiction:

Improvesynchronization reliabilityVSAvoidbeacon format complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements dynamics by making the beacon format adaptive based on the target device type. The NAN Sync Beacon uses a new frame subtype (6) and Public Action category (0x0A) that dynamically signals to receiving devices how to interpret the frame. Legacy devices encountering this new format will recognize it as unfamiliar and ignore it, while NAN devices will properly parse the NAN-specific fields. This dynamic approach prevents misassociation while managing complexity through conditional interpretation rather than multiple complete format definitions.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP3346790B1Systems, apparatus and methods using sync beacons in neighbor awareness networking (NAN)

Publication Date: 2020.09.02 INTEL IP CORP

Figure 1

AI summary

Techniques are disclosed using Sync Beacons in neighbor awareness networking (NAN) in wireless networks, wherein the Sync Beacon frames use Public Action frames for the Sync Beacon. Such networks include (but are not limited to) IEEE 802.11 networks.