Soft AP Multi-Link Access Using Secondary Link TXOP Coordination
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Solution Overview
Problem
Existing IEEE 802.11 protocols for soft Access Point (AP) Multi-Link Devices (MLDs) impose limitations on network throughput by requiring simultaneous activity on both links, leading to underutilization of secondary links when the primary link is occupied.
Innovation Solution
Enhanced Multi-Link Operations (MLO) protocols allowing non-AP MLDs to access soft AP MLDs by aligning the end of transmissions on the secondary link with the primary link's activity, using additional frame exchanges and triggers to facilitate access when the primary link is occupied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a non-AP MLD is required to occupy both primary link and non-primary link simultaneously for access, then coordination between links is maintained, but network throughput is reduced and secondary links are underutilized
Solution Approach 1:
The access procedure is segmented into separate phases: first accessing the primary link to establish TXOP, then independently accessing the non-primary link using the TXOP information from the primary link. This allows each link to be accessed independently rather than requiring simultaneous occupation of both links, thereby improving throughput while maintaining coordination through the TXOP-based synchronization mechanism.
Solution Approach 2:
The STA performs preliminary action by first accessing the primary link and obtaining TXOP information before accessing the non-primary link. This preliminary action on the primary link enables the STA to schedule and coordinate subsequent transmissions on the non-primary link, ensuring proper timing and avoiding collisions without requiring simultaneous dual-link occupation.
2Adaptability or versatility
If the soft AP MLD requires simultaneous transmission on both links, then link coordination is ensured, but the secondary link remains unused when the primary link is occupied
Solution Approach 1:
The access mechanism is made dynamic by allowing the STA to flexibly access either the primary link or the non-primary link based on current channel conditions and TXOP availability. The STA can dynamically switch between links and use TXOP information from one link to coordinate access on the other link, enabling adaptive utilization of available resources rather than being constrained to simultaneous dual-link operation.
Solution Approach 2:
The useful action continues by maintaining TXOP-based coordination that enables continuous transmission opportunities on both links. The TXOP information obtained from the primary link ensures that transmissions on the non-primary link are properly timed and coordinated, allowing continuous useful action on both links without requiring simultaneous occupation, thus improving overall link utilization.
3Reliability
If additional frame exchanges are introduced for secondary link access, then access control is improved, but protocol complexity increases
Solution Approach 1:
The TXOP information mechanism serves multiple functions: it provides timing information for coordination, enables access control for both primary and non-primary links, and maintains reliability across different transmission scenarios. By making this single mechanism multi-functional, the protocol achieves improved access control reliability without proportionally increasing complexity, as one mechanism handles multiple purposes rather than requiring separate dedicated mechanisms for each function.
Data Source
AI summary
An IEEE 802.11 wireless protocol which allows a non-Access Point Multi-Link Device (non-AP MLD) to access a soft AP MLD (e.g., an MLD which is not configured for Simultaneous Transmit and Receive (STR)) over a conditional link (Link2) when the primary/basic link (Link1) is occupied by another STA/MLD. Additional frame exchanges are described between MLDs to facilitate the Non-AP MLD's ability to accessing the soft AP MLD. Utilizing the approach can increase overall network throughput in a single BSS or OBSS.