Multi-Link WLAN Primary-Link Signaling for NSTR TID Mapping
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Solution Overview
Problem
Existing Non-Simultaneous Transmit and Receive (NSTR) mobile Access Point (AP) Multi-Link Device (MLD) operations face challenges in discovering and setting up multi-links, particularly in managing Traffic Identifier (TID) mapping and Beacon/Probe Response frames, due to optional support for Extremely High Throughput (EHT) features, Multi-User (MU) operation, and spatial streams, and varying MAC addresses.
Innovation Solution
A wireless communication method and device implementation that supports a Primary Link and Non-Primary Link (PLNPL) mode, enabling efficient TID mapping and Beacon/Probe Response frame management by designating one link as primary and another as non-primary, with specific frame structures and subfields to indicate link roles and capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If an NSTR mobile AP MLD designates one link as primary link for transmitting Beacon and Probe Response frames, then the device complexity is reduced and battery power consumption is lowered, but the STAtion (STA) cannot learn the full information of the other link and TID-to-link mapping negotiation becomes unclear
Solution Approach 1:
The patent introduces an intermediary mechanism where the primary link acts as a mediator to convey information about the nonprimary link. Beacon and Probe Response frames transmitted on the primary link contain embedded information that enables STAs to learn about the nonprimary link's capabilities and characteristics without requiring the nonprimary link to independently transmit these frames, thus saving battery power while preserving information availability
Solution Approach 2:
The primary link is designed to serve multiple functions simultaneously: it not only transmits regular Beacon and Probe Response frames for basic connectivity but also carries additional information about the nonprimary link. This multi-functionality allows the primary link to convey comprehensive network information including TID-to-link mapping for both links, eliminating the need for separate information transmission on the nonprimary link
2Device complexity
If only one AP of affiliated APs operating in an NSTR pair of links sends Beacon and Probe Response frames, then the device complexity and operation overhead are reduced, but the mechanism for multi-link setup and TID mapping negotiation becomes unclear
Solution Approach 1:
The patent applies preliminary action by pre-configuring and embedding TID-to-link mapping information and nonprimary link characteristics into Beacon and Probe Response frames that are transmitted on the primary link before actual data transmission begins. This allows STAs to perform multi-link setup and TID mapping negotiation based on this pre-provided information, simplifying the operational process while maintaining clear multi-link functionality
Solution Approach 2:
The primary link creates a copy or representation of the nonprimary link's essential information within its transmitted frames. By embedding the nonprimary link's capabilities, parameters, and TID mapping relationships into the primary link's Beacon and Probe Response frames, the system enables complete multi-link setup procedures through a single transmission point, reducing operational complexity while preserving full functionality
Data Source
AI summary
The present disclosure provides a wireless communication method, applied in a first STAtion (STA) affiliated with a non-AP Multi-Link Device (MLD). The wireless communication method includes: receiving a first frame from a first Access Point (AP) affiliated with an AP Multi-Link Device (MLD), the first frame indicating that the AP MLD supports a mode, in which at least two links belonging to the AP MLD comprises a primary link and a nonprimary link, and the first frame further indicating a first link and a second link of the at least two links as the primary link for transmitting Beacon and Probe Response frames and the nonprimary link, respectively; transmitting a fourth frame to the first AP; and receiving a fifth frame from the first AP.