TDLS Discovery Timing for NSTR-Constrained Multi-Link Devices
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Solution Overview
Problem
Existing wireless communication technologies face challenges in facilitating peer-to-peer direct link discovery for non-simultaneous transmit/receive (NSTR) constrained multi-link devices (MLDs) due to interference issues, as current TDLS Discovery processes are broken for NSTR-constrained non-AP MLDs, preventing effective communication.
Innovation Solution
Implement methods and apparatuses that allow non-AP MLDs to generate messages identifying target links for P2P direct links, and wait for a predetermined period before performing uplink transmissions, ensuring compliance with NSTR constraints by aligning PPDU end times and using a TDLS Discovery Response Wait Time to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-AP MLD performs uplink transmissions on the second link simultaneously with TDLS discovery on the first link, then communication efficiency is improved, but NSTR constraints are violated causing interference
Solution Approach 1:
The non-AP MLD waits for a predetermined period after transmitting the TDLS discovery request before performing uplink transmissions on the second link. This preliminary waiting action ensures that the TDLS discovery response can be received without interference from simultaneous uplink transmissions, while still maintaining relatively high communication efficiency by resuming transmissions after the wait period rather than disabling them completely.
2Reliability
If non-AP MLD waits for predetermined period before uplink transmissions, then NSTR constraints are satisfied, but discovery response reception is improved
Solution Approach 1:
Instead of waiting for an excessively long period or disabling uplink transmissions entirely, the non-AP MLD waits for a predetermined period that is sufficient to receive the TDLS discovery response but not so long as to significantly impact communication efficiency. This partial waiting action balances reliability of discovery response reception with minimal time loss.
3Adaptability or versatility
If TDLS discovery request is transmitted on first link, then P2P direct link establishment is enabled, but simultaneous uplink on second link causes NSTR violation
Solution Approach 1:
The patent segments the communication process into distinct phases: (1) transmit TDLS discovery request on first link, (2) wait for predetermined period, (3) then perform uplink transmissions on second link. This temporal segmentation ensures that TDLS discovery and uplink transmissions do not occur simultaneously, preventing NSTR constraint violations while still enabling both functions to be performed.
Solution Approach 2:
The non-AP MLD performs the waiting action preliminarily after transmitting the TDLS discovery request and before performing uplink transmissions. This preliminary waiting ensures that the P2P direct link establishment process can complete without interference from simultaneous uplink transmissions on the second link.
Data Source
AI summary
Methods and apparatuses for facilitating discovery by a multi-link device (MLD) of peer-to-peer (P2P) direct links that overlap with non-simultaneous transmit/receive (NSTR) constrained links of the MLD without violating NSTR constraints. A first non-access point (AP) MLD comprises first stations (STAs), each comprising a transceiver configured to form a link with a corresponding AP of an AP MLD, and a processor. Two of the links form an NSTR link pair. The processor is configured to generate a first message identifying a first NSTR link for establishment of a P2P direct link with a peer STA. The transceiver corresponding to one of the NSTR links is configured to transmit the first message to the AP MLD. The transceiver corresponding to a second NSTR link is configured to wait a predetermined period of time after the first message is transmitted before performing uplink (UL) transmissions to the AP MLD.