MCCAOP Advertisement Splitting in Wireless Mesh Networks
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Solution Overview
Problem
The existing IEEE 802.11s Draft Standard for WLAN Mesh Networking limits the number of MCCAOP reservations that can be advertised to 62 due to the restricted size of the MCCAOP advertisements element, which is insufficient for scenarios requiring more reservations.
Innovation Solution
An enhanced MCCAOP advertisements element is introduced, allowing for a sequence of advertisement elements with a unique sequence number and additional fields to indicate the sequence and completeness, enabling the advertisement of more than 62 MCCAOP reservations by splitting them across multiple elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the MCCAOP advertisements element is restricted to 255 octets, then the frame size limitation is maintained, but the number of MCCA reservations that can be advertised is limited to 62
Solution Approach 1:
The patent divides the MCCAOP advertisement into multiple sequence of advertisement elements, each containing a subset of MCCA reservations. This segmentation allows the system to advertise more than 62 reservations by distributing them across multiple elements, while each individual element remains within the 255 octet frame size limitation.
Solution Approach 2:
The patent introduces a temporal dimension by sequencing multiple advertisement elements. Instead of trying to fit all reservations into a single advertisement element, the system uses multiple elements transmitted in sequence, effectively adding a time dimension to the advertisement structure to accommodate more reservations.
2Quantity of substance
If multiple advertisement elements are used to advertise more than 62 reservations, then the quantity of reservations can be increased, but the complexity of processing and managing advertisements increases
Solution Approach 1:
The patent incorporates a confirmation mechanism where the receiving node sends back confirmation information about which advertisement elements have been received and processed. This feedback loop allows the transmitting node to track which reservations have been successfully advertised and can adjust subsequent advertisements accordingly, simplifying the processing complexity.
Solution Approach 2:
The patent uses a sequence number field in each advertisement element to pre-identify the order and status of advertisements. This preliminary indexing allows receiving nodes to process advertisements in the correct sequence and understand which elements are new and which have been previously transmitted, streamlining the processing operation.
3Loss of information
If the advertisement includes all MCCA reservations known to the transmitting node, then complete information is provided, but the advertisement size may exceed the frame limitation
Solution Approach 1:
The patent segments the complete set of MCCA reservations into multiple advertisement elements, each containing a manageable subset. This segmentation ensures that all necessary reservation information can be transmitted while keeping each individual element within the 255 octet frame size limitation.
Solution Approach 2:
The patent introduces a dynamic advertisement structure where the transmitting node can adjust which reservations are included in each advertisement element based on current network conditions and what information is actually needed. This dynamic approach allows complete information to be provided across multiple elements while adapting to frame size constraints.
Data Source
AI summary
According to the known IEEE 802.11s Draft Standard for WLAN Mesh Networking, version D5.0, the size of an information element is restricted to a length of 255 octets. Due to the definition of an MCCAOP advertisements element as a general information element this restriction is a major drawback leading to a maximum of 62 MCCA reservations to be advertised by an MCCAOP advertisements element. Although this number of reservations might be sufficient in the majority of situations, it is easily imaginable that there are situations which could require an advertisement exceeding this limit of 62 MCCA reservations. According to the disclosure, an MCCAOP advertisement—which is a set of MCCAOP reservations that needs to be advertised—is split over multiple MCCAOP advertisements elements. This may advantageously allow advertising more than 62 MCCAOP reservations to neighboring mesh nodes in a wireless mesh network which is configured to use MCCA.