Multi-Link WLAN TID Mapping With Precise Switch-Time Synchronization
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Solution Overview
Problem
The existing 802.11be standard's TID-to-link mapping mechanism in multi-link communication systems fails to accurately indicate the effective start time of traffic identifier-to-link mapping across different links, leading to inconsistent understandings between access point multi-link devices (AP MLD) and non-access point multi-link devices (non-AP MLD), which hampers reliable communication.
Innovation Solution
The AP MLD generates frames indicating the effective start time of TID-to-link mapping, ensuring that links are enabled or disabled at appropriate times relative to a reference time (TBTT) to synchronize with non-AP MLDs, thereby aligning the understanding of mapping times across devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the mapping switch time field indicates a TBTT of any link, then the time precision is limited to TU level, but this causes inability to accurately indicate TU boundary of another link
Solution Approach 1:
The patent segments the time indication mechanism by introducing separate fields for different time granularities: a mapping switch time field for TU-level indication and a separate offset field for sub-TU precision adjustment. This allows the system to indicate both the coarse TBTT boundary and the precise sub-TU offset independently, resolving the contradiction between time precision and communication reliability.
Solution Approach 2:
The offset field acts as an intermediary that bridges the gap between the TU-level mapping switch time indication and the actual sub-TU precise timing requirement. By introducing this intermediate parameter, the system can indicate the TBTT of one link and calculate the corresponding TU boundary of another link with sub-TU precision, thereby improving both measurement precision and communication reliability.
2Adaptability or versatility
If different links use independently selected TSF timers, then each link operates autonomously, but this causes TU boundaries to misalign across links
Solution Approach 1:
The offset field serves as a mediator that translates between the independently selected TSF timers of different links. By indicating a TBTT of one link and providing an offset to its TU boundary, the system enables precise time alignment across links with independent timers, maintaining link independence while achieving synchronization precision.
Solution Approach 2:
The patent changes the time indication parameter from a single TU-level value to a two-parameter system: a mapping switch time field indicating TBTT and an offset field indicating sub-TU adjustment. This parameter transformation allows the system to accommodate independently selected TSF timers while achieving precise TU boundary alignment across links.
3Device complexity
If the mapping switch time field uses TU granularity, then the indication is simple, but this causes inability to indicate sub-TU precise timing
Solution Approach 1:
The time indication mechanism is segmented into two parts: a mapping switch time field for TU-level indication and an offset field for sub-TU precision. This segmentation maintains the simplicity of TU-level indication while adding precise sub-TU timing capability through the offset parameter, effectively resolving the contradiction between complexity and precision.
Solution Approach 2:
The patent adds a new dimension to the time indication by introducing an offset field that operates at a finer granularity (sub-TU level) than the original mapping switch time field. This dimensional extension allows the system to indicate both coarse TU boundaries and fine sub-TU offsets, achieving high precision without significantly increasing overall mechanism complexity.
Data Source
AI summary
A communication method and a related apparatus are disclosed, are applied to a wireless local area network system supporting 802.11 series protocols, and may be further applied to an ultra-bandwidth-based wireless personal local area network system and a sensing system. An access point multi-link device (AP MLD) sends at least one first frame on at least one first link. The first frame indicates an effective start time of traffic identifier-to-link mapping. When the traffic identifier-to-link (TID-to-link) mapping indicates a second link to be disabled, the AP MLD disables the second link not earlier than a time point Tb. When the TID-to-link mapping indicates a second link to be enabled, the AP MLD enables the second link not later than a time point Ta.