WLAN Data Unit Format Overhead Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current IEEE 802.11 standards face inefficiencies in data transmission due to high overhead in low data rate wireless local area networks (WLANs) operating in sub-1 GHz frequencies, leading to increased power consumption and reduced transmission efficiency.
Innovation Solution
The proposed solution involves altering the MAC and PHY layer data unit formats to reduce overhead, including the use of shorter address fields, encapsulating global MAC addresses in the frame check sequence, and employing techniques like early receiver indication and non-data packet control data units to optimize transmission efficiency in long range communication protocols like IEEE 802.11ah.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional MAC and PHY layer data unit formats are used in sub-1 GHz WLANs, then address identification and protocol compatibility are ensured, but transmission overhead increases and power consumption rises
Solution Approach 1:
The patent extracts the global MAC address identification function from the traditional address fields and relocates it to the Frame Check Sequence (FCS) field. This separation allows the address fields to be shortened while maintaining the ability to identify destinations, thereby reducing overhead and power consumption without losing addressing capability
Solution Approach 2:
The patent changes the parameter of address field length from the traditional 6 bytes to shorter lengths (1-4 bytes), and modifies the FCS field to incorporate global MAC address bits. This parameter transformation reduces the overall data unit size while preserving addressing functionality through the modified FCS structure
2Productivity
If shorter address fields are used to reduce overhead, then transmission efficiency improves, but address identification accuracy may be compromised
Solution Approach 1:
The patent embeds global MAC address identification capability within the FCS field structure. The FCS field contains nested address information (global MAC address bits) that enables accurate identification despite shorter address fields in the main data unit structure
Solution Approach 2:
The FCS field acts as an intermediary that carries global MAC address information. This intermediary structure enables the shortened address fields to function accurately by providing additional identification data through the modified FCS without requiring full-length addresses in the primary address fields
3Loss of energy
If global MAC addresses are encapsulated in the FCS field, then address field length is reduced and overhead decreases, but FCS calculation and verification complexity increases
Solution Approach 1:
The patent segments the FCS field into multiple parts, with specific bits allocated for global MAC address information and other bits for traditional error checking. This segmentation allows the FCS to serve dual purposes: error detection and address identification, reducing overhead while managing complexity through structured organization
4Length of stationary object
If low data rate transmission is used for long range communication, then propagation range is extended, but transmission time increases and power consumption rises
Solution Approach 1:
The patent extracts unnecessary overhead elements from the data unit structure, removing redundant bytes and simplifying field formats. This extraction reduces the total transmission time required for each data unit, counteracting the increased transmission time inherent in low data rate long-range communication
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In a method for transmitting a data unit in a wireless communication network, a physical layer (PHY) preamble and a media access control layer (MAC) header are generated. In generating the MAC header, a first address field to include a first address and a second address field to include a second address are generated. The first, not globally unique, address indicates a communication device for which the data unit is intended or a communication device that is transmitting the data unit. The second address field indicates the other one of a communication device for which the data unit is intended or a communication device that is transmitting the data unit. The first address field and the second address field are included in the MAC header. The MAC header omits a globally unique address corresponding to the first address of the first address field.