Multi-Link NSS Negotiation for Complete Stream Reception
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Solution Overview
Problem
In wireless local area networks (WLANs), multi-link devices (MLDs) face challenges in receiving all streams due to limitations in transmitting streams with at least the maximum number of spatial streams (NSS) capability on a specific link, leading to inefficiencies in stream allocation and communication.
Innovation Solution
A method where a non-AP station (STA) MLD transmits a negotiation frame with NSS information to an AP MLD through a first link, receiving a negotiation response frame to optimize stream allocation and ensure all streams are received effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stream allocation is limited on a specific link, then device complexity is reduced, but complete stream reception cannot be achieved
Solution Approach 1:
The patent segments the stream transmission across multiple links (first link and second link) rather than attempting to transmit all streams through a single link. The non-AP MLD divides the maximum NSS capability into portions that can be transmitted through each link, with the first link carrying up to its NSS capability and the second link carrying the remaining streams. This segmentation resolves the contradiction by enabling complete stream reception through distributed transmission while keeping each link's allocation manageable.
Solution Approach 2:
The patent introduces a multi-dimensional approach by utilizing multiple communication links (dimensions) instead of relying on a single link. By expanding from one-link to multi-link transmission, the system can achieve complete stream reception without overloading any single link. The negotiation mechanism operates across this expanded dimensional space, allowing the non-AP MLD to negotiate and allocate streams across multiple links to ensure all streams are received.
2Reliability
If maximum NSS capability is negotiated through multiple links, then complete stream reception is achieved, but communication overhead increases
Solution Approach 1:
The patent implements preliminary action by conducting stream capability negotiation before actual data transmission begins. The non-AP MLD sends a negotiation frame to the AP MLD indicating its maximum NSS capability on the first link, and the AP MLD responds with a negotiation response frame. This preliminary negotiation establishes the stream allocation parameters in advance, preventing the need for repeated negotiations during data transmission and reducing overall communication overhead while ensuring complete stream reception.
Solution Approach 2:
The patent employs feedback mechanisms where the AP MLD responds to the non-AP MLD's negotiation frame with a negotiation response frame that confirms or adjusts the stream allocation. This feedback loop ensures both parties agree on the maximum NSS capability before transmission begins, preventing information loss and ensuring complete stream reception without requiring excessive back-and-forth communication during the actual data transfer phase.
3Productivity
If stream allocation is optimized across multiple links, then communication efficiency is enhanced, but device complexity increases
Solution Approach 1:
The patent applies universality by creating a standardized negotiation mechanism that can be applied across multiple links with consistent rules and procedures. The same negotiation frame structure and capability indication methods are used on both the first and second links, allowing the system to optimize stream allocation across multiple links without requiring link-specific complex coordination logic. This universal approach enhances communication efficiency while keeping device complexity manageable through standardized procedures.
Data Source
AI summary
The present disclosure relates to a method performed by a non-access point (AP) station (STA) multi-link device (MLD) of a wireless LAN system, the method comprising the steps of: transmitting, through a first link, a negotiation frame including first maximum number of spatial stream (NSS) information to an AP MLD; and receiving a negotiation response frame from the AP MLD through the first link.