Multi-Link Traffic Indication Element for TID-to-Link Mapping Overhead
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Solution Overview
Problem
The existing TID-to-link mapping systems face challenges in efficiently managing multi-link traffic information elements, leading to increased beacon size and overhead, particularly due to the need for bitmaps that indicate link usage for non-AP MLDs, which can be cumbersome and inefficient, especially in scenarios where all TIDs are mapped to a subset of links and some TIDs are mapped to an additional link.
Innovation Solution
The proposed solution modifies the Multi-Link Traffic Indication element to use a single-bit Per-Link Traffic Indication Bitmap, where a value of 1 indicates buffered data for all links, and 0 indicates buffered data only on links where all TIDs are mapped, reducing the overhead and simplifying the information needed for non-AP MLDs operating in enhanced TID-to-link mapping modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a bitmap is used to indicate link usage for each non-AP MLD in TID-to-link mapping, then link-specific traffic information can be provided, but the beacon size and overhead increase significantly
Solution Approach 1:
The patent extracts only the essential traffic information needed for non-AP MLDs operating in enhanced TID-to-link mapping modes. Instead of including complete per-link bitmaps for all scenarios, it selectively includes only the indication bit that specifies whether buffered data exists on links where all TIDs are mapped or on any link, thereby removing redundant information and reducing beacon size while maintaining necessary functionality
Solution Approach 2:
The patent changes the parameter representation from a multi-bit bitmap (where each bit represents a specific link) to a single-bit indication that changes the semantic meaning based on the enhanced TID-to-link mapping mode. This parameter transformation reduces the information element size from potentially multiple bits to just one bit, directly addressing the beacon overhead problem
2Measurement precision
If per-link bitmaps are included for all non-AP MLDs, then accurate link-specific buffered data indication is achieved, but the Multi-Link Traffic element becomes cumbersome and complex
Solution Approach 1:
The patent creates a universal indication mechanism that serves multiple functions: it indicates buffered data presence for links where all TIDs are mapped, indicates buffered data for the additional link, and works across different enhanced TID-to-link mapping configurations. This single-bit indication replaces multiple per-link bitmaps, reducing structural complexity while maintaining accurate buffered data indication for all relevant scenarios
Solution Approach 2:
Instead of the traditional approach of providing positive confirmation for each link that has buffered data (bitmap with multiple bits), the patent inverts the approach by providing a single indication that specifies the mapping relationship context. This inversion simplifies the element structure from a detailed per-link breakdown to a contextual indication that enables non-AP MLDs to determine link-specific information based on their configured TID-to-link mapping
Data Source
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AI summary
This disclosure describes systems, methods, and devices related to TID-to-link mapping. A device may generate a multi-link frame comprising a multi-link traffic indication element. The device may include an indication for bufferable units (BUs) using a per-link indication bitmap. The device may cause to send the multi-link frame to the one or more STAs.