Communication Apparatus Out-of-DW Notification for NAN Band Management
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Solution Overview
Problem
In Neighbor Awareness Networking (NAN) systems, devices with large service information may occupy the predetermined communication period, preventing other devices from communicating service information or maintaining synchronization, especially when information is communicated outside the Discovery Window (DW) period.
Innovation Solution
The communication apparatus notifies other devices that service information with a size larger than a predetermined value will be transmitted outside the DW period using an out-of-DW transmission notification frame, allowing devices to recognize and adjust their communication schedules, thereby reducing band occupation and failure to communicate service information within the DW period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If service information with large data size is communicated in the predetermined period, then the communication apparatus can transmit complete service information, but the communication band is occupied preventing other apparatuses from communicating service information or maintaining synchronization
Solution Approach 1:
The service information communication is segmented into two parts: notification of transmission intent sent within the predetermined DW period, and actual large data transmission performed outside the DW period. This segmentation allows the DW period to remain available for synchronization and other communications while enabling complete service information to be transmitted outside this constrained window.
Solution Approach 2:
The patent extends communication from a single time dimension (only within DW period) to two time dimensions (within DW period for notification, outside DW period for actual transmission). This dimensional expansion resolves the contradiction by separating the control plane (notification) from the data plane (actual service information), allowing both small control messages and large data to coexist without interference.
2Productivity
If service information is communicated outside the predetermined period, then the communication band is freed for other apparatuses, but other apparatuses may be in sleep state and communication cannot be performed
Solution Approach 1:
The transmitting apparatus performs preliminary action by sending a notification frame within the DW period that announces the intent and timing of subsequent service information transmission outside the DW period. This allows receiving apparatuses to wake up or prepare in advance, ensuring they are in a receptive state when the actual data transmission occurs, thus maintaining high communication success rate while enabling band availability during DW period.
3Quantity of substance
If partial apparatuses occupy the predetermined period for communication, then they can transmit large service information, but other apparatuses are prevented from communicating service information
Solution Approach 1:
The patent extracts the actual service information transmission from the DW period, removing the large data communication burden from this shared communication window. Only lightweight notification frames remain in the DW period, while bulk data transmission is extracted and performed outside this period. This extraction enables multiple apparatuses to use the DW period for various purposes without being blocked by single apparatus's large transmissions.
Data Source
AI summary
A communication apparatus notifies that service information is to be communicated outside a cyclically repeated period in which a plurality of apparatuses including the communication apparatus transmits or receives a beacon to another communication apparatus included in the plurality of apparatuses and being a destination of the service information.