Medium Sync Delay Timer Logic for Fair Multi-Link Channel Access
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Solution Overview
Problem
In multi-link wireless communication devices, signal interference between frequency bands leads to packet loss and network allocation vector update misses, causing fairness issues and performance limitations due to stations participating in channel contention without proper medium synchronization.
Innovation Solution
A method and apparatus for setting the medium synchronization delay timer based on the link pair capabilities of the sending station, ensuring that the timer is not reset to zero when the station has lost synchronization, thereby reducing collisions and improving channel contention fairness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a station directly participates in channel contention after losing medium synchronization, then channel access speed is improved, but channel contention fairness deteriorates
Solution Approach 1:
The patent applies dynamics by making the MediumSyncDelay timer configurable and adjustable based on operational conditions. The timer value is set to 0 for STR link pairs (allowing immediate channel access) and set to a positive value for NSTR link pairs (delaying channel access), enabling the system to dynamically adapt its synchronization behavior to the specific link characteristics and interference conditions.
Solution Approach 2:
The patent applies local quality by differentiating the medium synchronization delay treatment for different link pairs. Specifically, STR link pairs receive one treatment (timer set to 0, no delay) while NSTR link pairs receive different treatment (timer set to positive value, delay applied). This localized differentiation ensures that each link pair's specific interference characteristics are addressed appropriately.
2Speed
If the medium synchronization delay timer is always reset to zero upon receiving RTS frame, then station responsiveness is improved, but collision probability increases
Solution Approach 1:
The patent applies local quality by differentiating the timer reset behavior based on the link pair type. For STR link pairs, the MediumSyncDelay timer is reset to zero upon receiving RTS frames, ensuring high responsiveness. For NSTR link pairs, the timer is not reset (or reset to a positive value), which prevents collisions by maintaining the delay. This localized differentiation resolves the contradiction by applying appropriate responses to different link characteristics.
Solution Approach 2:
The patent applies dynamics by making the timer reset behavior conditional rather than fixed. The decision to reset or not reset the MediumSyncDelay timer depends on the link pair type (STR vs NSTR) and the synchronization status, allowing the system to adapt its responsiveness to current operational conditions while avoiding collisions.
3Productivity
If multi-link device performs parallel communication on multiple frequency bands, then throughput is improved, but signal interference increases
Solution Approach 1:
The patent applies segmentation by dividing the multi-link device's communication into different categories based on link pair characteristics. Link pairs are segmented into STR (simultaneous transmitting and receiving) and NSTR (non-simultaneous) types. This segmentation allows the device to manage interference by applying different synchronization and channel access rules to different link pairs, enabling parallel communication while controlling harmful interference effects.
4Productivity
If station participates in channel contention without medium synchronization, then channel access efficiency is improved, but packet loss increases
Solution Approach 1:
The patent applies dynamics by making channel access conditional on medium synchronization status. The MediumSyncDelay timer creates a dynamic delay mechanism that allows stations to participate in channel contention only when properly synchronized. This dynamic control improves channel access efficiency for synchronized stations while preventing packet loss by blocking unsynchronized stations from contending.
Data Source
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AI summary
This application relates to the field of wireless communication, is applied to a wireless local area network supporting 802.11 series standards, and in particular relates to a medium synchronization delay timer setting method and a related apparatus. The method includes: When transmission of another station ends, a station on an NSTR link pair of an MLD starts a medium synchronization delay timer and sets an initial value (not 0). The station receives a PPDU carrying an MPDU, where the MPDU includes an RTS frame. If the RTS frame is sent by an access point associated with the station, and a link on which the access point is located is not a link in any NSTR link pair of an MLD with which the access point is affiliated, the station resets a count value of the medium synchronization delay timer to 0. According to embodiments of this application, impact of an unnecessary limitation on performance of a station that has lost medium synchronization can be reduced, and the performance of the station can be improved.