MAC Header Compression for Sub-1GHz WLANs

Solution Overview

Problem

Current IEEE 802.11 standards for wireless local area networks (WLANs) have inefficiencies in MAC header processing, particularly in sub-1GHz frequency operations, leading to increased overhead and power consumption due to unnecessary address fields and the lack of support for unassociated stations and multicast addresses.

Innovation Solution

The proposed solution involves modifying the MAC header structure by removing unnecessary address fields and using flag bits to indicate association status and packet type, allowing for reduced overhead and efficient processing, especially in scenarios where AIDs are not available or multicast addresses are required.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the standard MAC header structure with multiple address fields is used, then compatibility with existing IEEE 802.11 standards is maintained, but MAC header overhead increases and power consumption increases

Engineering Contradiction:

Improvestandard compatibilityVSAvoidMAC header overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent extracts and removes unnecessary address fields from the MAC header based on packet type and association status. Specifically, the third address field is omitted for unassociated stations, and the fourth address field is omitted for direct communications, thereby reducing MAC header overhead while maintaining necessary functionality through conditional field inclusion

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent implements dynamic MAC header structure where the presence and content of address fields change based on runtime conditions such as association status, packet direction, and communication mode. This dynamic adaptation allows the header to contain only necessary information for each specific transmission scenario, reducing overall overhead

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If the standard MAC header structure with full address fields is used, then all communication scenarios are supported, but power consumption increases due to processing unnecessary information

Engineering Contradiction:

Improvecommunication scenario supportVSAvoidpower consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent extracts and removes unnecessary address fields from the MAC header based on packet type and association status. Specifically, the third address field is omitted for unassociated stations, and the fourth address field is omitted for direct communications, thereby reducing MAC header overhead while maintaining necessary functionality through conditional field inclusion

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the parameters of the MAC header structure dynamically based on communication scenarios. By modifying which address fields are present and their content based on association status and packet direction, the system adapts the header to contain only necessary information, reducing processing power consumption

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If the third address field is always included in the MAC header, then multicast and unassociated station support is maintained, but MAC header overhead increases

Engineering Contradiction:

Improvemulticast and unassociated station supportVSAvoidMAC header overhead

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent implements dynamic MAC header structure where the presence and content of address fields change based on runtime conditions such as association status, packet direction, and communication mode. This dynamic adaptation allows the header to contain only necessary information for each specific transmission scenario, reducing overall overhead

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies different address field configurations to different packet types and communication scenarios. Specifically, unassociated stations receive packets with omitted third address fields, while multicast packets include appropriate address fields, thereby optimizing the header structure locally for each specific case rather than using a uniform structure

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP2810478B1Mac header compression in long-range wireless local area networks

Publication Date: 2016.11.16 MARVELL WORLD TRADE LTD

Figure 1
Figure 2
Figure 3

AI summary

A method includes receiving, at or from a station STA, a plurality of packets. Each packet includes a set of flag bits, and a MAC header containing at least a first address field specifying a receiver address and a second address field specifying a transmitter address. The method also includes determining whether each set of flag bits indicates that the STA was associated with an AP when the respective packet was generated, and processing the MAC header of each packet. Processing the MAC header of each packet includes processing a third address field in each packet for which it is determined that the respective set of flag bits indicates that the STA was not associated with an AP when the respective packet was generated. The third address field contains a MAC address of the STA.