Non-AP MLD EMLSR Switching for Uplink Frame Exchange
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Solution Overview
Problem
Current specifications for enhanced multi-link single radio (EMLSR) operations in non-access point multi-link devices (non-AP MLDs) do not adequately address uplink transmission procedures, limiting data transmission throughput and increasing latency due to restricted simultaneous operations on multiple links.
Innovation Solution
Implementing a method for non-AP MLDs to initiate a switch procedure from a listening operation to a frame exchange operation on one link using multiple spatial streams, and for AP MLDs to determine a time point for initiating downlink transmission after a switch, along with error recovery mechanisms for failed transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a non-AP MLD performs listening operations on multiple links simultaneously in EMLSR mode, then link monitoring capability is improved, but data transmission throughput is limited because only one link can be used for data reception at a time
Solution Approach 1:
The patent implements dynamic switching between listening mode and frame exchange mode. The non-AP MLD can dynamically select which link to use for frame exchange based on real-time channel conditions and traffic requirements, while maintaining listening capability on other links. This dynamic adaptation resolves the contradiction by allowing the system to switch between monitoring-focused and transmission-focused states.
Solution Approach 2:
The patent segments the operation into distinct phases: listening phase where multiple links are monitored, and frame exchange phase where one link is used for high-speed data transmission. By dividing the operation into segmented phases with clear transitions, the system can achieve both comprehensive link monitoring and high throughput transmission without simultaneous interference.
2Productivity
If a non-AP MLD switches from listening operation to frame exchange operation with multiple spatial streams, then data transmission capability is improved, but switching complexity and latency increase
Solution Approach 1:
The patent performs preliminary actions by establishing listening operations on multiple links before initiating frame exchange. The non-AP MLD pre-identifies suitable links for potential frame exchange and prepares the necessary configurations in advance. This preliminary preparation reduces the actual switching complexity and latency when frame exchange needs to commence.
Solution Approach 2:
The listening operation serves as an intermediary state between complete idle mode and full frame exchange mode. This intermediate state allows the non-AP MLD to maintain partial radio activity and link awareness without committing to full frame exchange on all links, thereby reducing the abruptness and complexity of mode transitions.
3Device complexity
If current EMLSR specifications are maintained without enhancement, then device simplicity is preserved, but uplink transmission procedures are inadequate and latency increases
Solution Approach 1:
The patent introduces new parameters and procedures specifically for uplink transmission in EMLSR mode, such as uplink frame exchange procedures and associated timing parameters. By adding these targeted parameter enhancements rather than redesigning the entire specification, the patent improves uplink performance while maintaining backward compatibility and relative specification simplicity.
4Productivity
If frame exchange operation with multiple spatial streams is implemented, then data transmission throughput is improved, but error recovery requirements increase due to more complex transmission scenarios
Solution Approach 1:
The patent implements feedback mechanisms where the non-AP MLD monitors frame exchange outcomes and channel conditions, then adjusts transmission parameters accordingly. When errors occur in multi-spatial stream transmissions, the feedback loop enables rapid detection and recovery by switching to more robust transmission modes or retransmitting on different links, thereby maintaining high throughput while ensuring reliability.
Data Source
AI summary
A non-AP MLD includes: a memory configured to store a computer program; and a processor configured to invoke and execute the computer program stored in the memory. The processor is configured to perform: initiating a first switch procedure of a first link, in a case where a TXOP is initiated or successfully obtained by a first affiliated STA of the non-AP MLD on the first link of EMLSR links. The TXOP is used for the first affiliated STA of the non-AP MLD to transmit an uplink PPDU. A first switch refers to that the non-AP MLD operating in an EMLSR mode switches from a first operation mode to a second operation mode.