MAC Frame Header Overhead Reduction via Dynamic Address Fields
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Solution Overview
Problem
Existing communication protocols have a large overhead in data frame headers, particularly in 802.11ah scenarios, which affects transmission efficiency and completeness of data frame forwarding.
Innovation Solution
A method and apparatus that determine and utilize data transmission direction information to reduce the MAC frame header overhead by selectively including destination and source addresses, using bits like ToDS and FromDS to indicate forwarding requirements, thereby optimizing the address field to carry only necessary address information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed MAC frame header structure is used with all address fields, then complete address information is available for all transmission scenarios, but the overhead becomes excessively large (28 bytes) for short data packets
Solution Approach 1:
The patent applies dynamics by making the address field configuration flexible rather than fixed. The MAC frame header dynamically adjusts the number and type of address fields (Address1-Address6) based on transmission direction indicators (ToDS, FromDS bits) and forwarding requirements. This allows the header to adapt its size and content to match the specific transmission scenario, reducing overhead while maintaining necessary address information.
Solution Approach 2:
The patent implements local quality by making different parts of the address field structure serve different functions based on transmission needs. Instead of uniformly including all address fields in every frame, the patent selectively includes only the necessary address fields (TA, RA, DA, SA) based on the specific transmission direction and forwarding requirements of each data frame, optimizing each local segment of the header structure.
2Productivity
If address fields are compressed to reduce overhead, then transmission efficiency improves, but the ability to support data frame forwarding is lost
Solution Approach 1:
The patent achieves universality by designing the address field structure to serve multiple functions through the ToDS and FromDS bits. These indicator bits enable the same address field configuration to support different transmission modes (direct transmission, forwarding to AP, forwarding from AP) without requiring separate header structures. The compressed address fields universally handle both direct and forwarded transmissions by interpreting the indicator bits appropriately.
Solution Approach 2:
The patent uses dynamics to enable forwarding capability in compressed headers through the ToDS and FromDS indicator bits. These bits dynamically indicate whether the transmitter or receiver is an AP, allowing the receiver to determine whether forwarding is needed based on the same compressed address field structure used for direct transmissions. This dynamic interpretation restores forwarding capability without increasing header size.
3Quantity of substance
If existing compression methods simplify RA to AID and use partial transmitting address, then header size is reduced, but forwarding cannot be completed because the receiver cannot determine if it is the destination or a forwarder
Solution Approach 1:
The patent introduces ToDS and FromDS indicator bits as intermediaries that carry forwarding decision information without significantly increasing header size. These indicator bits act as mediators between the compressed address fields and the forwarding logic, enabling the receiver to determine whether it should forward the frame or deliver it to the destination. This intermediary mechanism preserves forwarding capability while maintaining header compression.
Solution Approach 2:
The patent applies parameter changes by using the ToDS and FromDS bits to change the interpretation parameters of the address fields. Instead of changing the physical size of address fields, the patent changes how these fields are interpreted based on the indicator bit values. This allows the same compressed address field configuration to support both direct transmission and forwarding scenarios by altering the logical parameters of address interpretation rather than the physical structure.
Data Source
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AI summary
The embodiments of the present invention provide an encoding mode for a traffic indication map and a beacon frame, relating to communications, such that a user is aware of whether there is data cached in an access point or a user terminal is aware of whether to access a channel, thus number of bytes occupied by a traffic indication map in a beacon frame is reduced. The encoding mode for a traffic indication map provided by the present embodiment comprises: controlling whether to display a divided block bitmap display field in a sub-bitmap by marking at least one bit in a bitmap control field, wherein a divided block sub-bitmap in a sub-bitmap is used for enabling a user terminal to know whether there is data cached in an access point, or enabling a user terminal to know whether to access a channel.