Simplified Frame Header Using Association Identifiers for Sensor Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 802.11ah sensor network scenarios, the existing WiFi data transmission efficiency is low due to the large size of MAC frames, which exceeds the small data amounts and low data transmission rates, failing to meet application requirements.
Innovation Solution
A simplified frame format is introduced for data frames, where the frame header includes a source address shorter than the MAC address, incorporating an association identifier, multicast unicast indicator, or data type, reducing the overall frame length and improving transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the existing MAC frame format is used, then the frame structure is standardized and compatible, but the frame header length reaches 24 bytes which exceeds the small data amounts in sensor networks, reducing transmission efficiency
Solution Approach 1:
The address field in the frame header is segmented into two parts: a short address (association identifier) for identifying the station within the basic service set, and a multicast unicast indicator. This segmentation reduces the address field length from 6 bytes to 2 bytes, directly resolving the contradiction between standardized frame structure and reduced frame header length for small data transmissions in sensor networks
Solution Approach 2:
The invention changes the parameter of address representation by using association identifiers (short addresses) instead of full MAC addresses. The association identifier is a 2-byte field that uniquely identifies stations within a basic service set, and combined with a 1-byte multicast unicast indicator, replaces the traditional 6-byte address field, reducing overhead while maintaining identification functionality
2Quantity of substance
If the MAC frame with 24-byte header is used, then complete addressing information is provided, but the overhead exceeds the transmitted data amount, causing low transmission efficiency in sensor networks
Solution Approach 1:
The invention extracts only the essential addressing information needed for sensor network operations - the association identifier (2 bytes) and multicast unicast indicator (1 byte) - and removes the redundant parts of the MAC address. This extraction reduces the address field from 6 bytes to 3 bytes, making the frame overhead appropriate for small data量 transmissions where the overhead should not exceed the actual data
Solution Approach 2:
The invention introduces dynamic address field length based on the communication scenario. By using the multicast unicast indicator to differentiate between unicast (using short address) and multicast (using full address) scenarios, the frame structure dynamically adapts its address field length to match the actual communication needs, optimizing the balance between addressing completeness and overhead reduction
Data Source
AI summary
A data communications method, apparatus, and system are provided. The method includes: sending an association request message to an access point; receiving an association response message sent by the access point, where the association response message includes an association identifier; generating a data frame, where a format of the data frame is a simplified frame format, and a frame header of the data frame includes a source address and a destination address, where the length of the source address is shorter than the length of a Media Access Control (MAC) address, and the source address includes the association identifier, the association identifier and a multicast unicast indicator, the association identifier and a data type, or the association identifier, the data type, and the multicast unicast indicator; and sending the data frame to the access point.