802.11az FTM Protocol Time Sync Overhead Reduction
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Solution Overview
Problem
The existing 802.11az FTM protocol lacks the capability to efficiently transport 802.1AS-based time synchronization information, which is essential for end-to-end link-independent timing across networks, leading to increased overhead and reduced air-time resources as the number of STAs in a BSS increases.
Innovation Solution
The enhanced FTM protocol system extends the 802.11az Location Measurement Report (LMR) frame to include the 802.1AS Vendor Specific Information Element, enabling the transfer of follow-up information and allowing the requester to indicate the purpose of the FTM Session establishment as TSN-based Time Synchronization, thereby supporting 802.1AS time synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing 802.11az FTM protocol is used without extension, then the protocol structure remains simple, but it lacks the capability to transport 802.1AS-based time synchronization information efficiently
Solution Approach 1:
The patent merges the 802.11az FTM protocol with 802.1AS time synchronization information by extending the LMR frame to include a Vendor Specific Information Element. This allows both location measurement and time synchronization functions to be transported through a single unified protocol structure, eliminating the need for separate message exchanges and reducing overall system complexity despite adding multi-functionality.
2Loss of information
If traditional time synchronization methods are used separately from FTM, then time synchronization information can be transmitted, but overhead increases and air-time resources are reduced
Solution Approach 1:
The patent combines time synchronization information transfer with the existing FTM location measurement process by embedding 802.1AS follow-up information within the LMR frame's Vendor Specific Information Element. This merging eliminates the need for separate synchronization message exchanges, thereby reducing protocol overhead and conserving air-time resources while ensuring complete time synchronization information is transmitted.
3Quantity of substance
If the number of STAs in a BSS increases, then network coverage and capacity improve, but overhead increases and air-time resources are reduced
Solution Approach 1:
The patent addresses scalability by merging multiple functions (location measurement, time synchronization, and follow-up information transfer) into a single LMR frame exchange. This consolidation means that as the number of STAs increases, each STA participates in the same efficient single-exchange protocol rather than multiple separate exchanges, thereby reducing per-STA overhead and preserving air-time resources even in large-scale deployments.
Data Source
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AI summary
This disclosure describes systems, methods, and devices related to enhanced FTM protocol. A device may establish a 802. IAS-based time synchronization. The device may enable a transfer of the 802.1AS follow up information within the 802.11az trigger-based FTM procedure.