Multi-Link Uplink Aggregation With Synchronous PPDU Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication technologies face challenges in achieving efficient bandwidth and latency gains in multi-link operations due to in-device interference and the need for costly filters, particularly in asynchronous transmission modes.
Innovation Solution
Implementing synchronous PPDU transmission mode by reserving a TXOP on a first link while waiting for the second link's RBO to count down to zero, with mechanisms to adjust or wait for the second RBO based on channel availability and interference, minimizing inter-device interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If asynchronous transmission mode is used in multi-link operations, then device complexity is reduced, but bandwidth gain and latency performance deteriorate
Solution Approach 1:
The patent combines synchronous transmission modes across multiple links to achieve bandwidth aggregation gains. By coordinating transmissions on multiple links simultaneously, the system achieves improved productivity without requiring costly filters, as the synchronous mode allows for more efficient resource utilization across links.
Solution Approach 2:
The system dynamically selects between synchronous and asynchronous transmission modes based on channel conditions and interference levels. This dynamic adaptation allows the system to optimize bandwidth gain when synchronous mode is feasible while falling back to asynchronous mode when device complexity constraints arise, resolving the contradiction between performance and complexity.
2Productivity
If synchronous PPDU transmission mode is implemented across multiple links, then bandwidth gain and latency reduction are achieved, but device complexity increases due to interference management requirements
Solution Approach 1:
The system performs preliminary actions by reserving TXOPs (Transmission Opportunities) on multiple links before actual data transmission. This advance reservation allows the device to coordinate synchronous transmissions across links, managing interference proactively rather than reactively, thereby reducing the complexity burden during actual transmission.
Solution Approach 2:
The system implements feedback mechanisms to monitor channel conditions and interference levels across multiple links. Based on this feedback, the device dynamically adjusts its transmission strategy, selecting appropriate links for synchronous transmission and modifying transmission parameters to minimize interference, thus managing device complexity while maintaining bandwidth gains.
3Loss of time
If TXOP reservation is performed on the first link while waiting for the second RBO to count down, then latency is reduced, but fairness to other devices deteriorates
Solution Approach 1:
The system performs partial action by reserving TXOPs on the first link immediately while conditionally waiting for the second RBO to count down. This partial reservation approach reduces latency by securing the first link without completely blocking it, allowing other devices to access the channel if the reservation is not fully utilized, thereby maintaining fairness while achieving latency reduction.
Data Source
AI summary
This disclosure provides methods, devices and systems for transmitting and receiving physical protocol data units (PPDUs) over multiple links. In some aspects, a wireless communication device may advertise a first enhanced distributed channel access (EDCA) set including first EDCA parameters for a first link and advertise a second EDCA set including second EDCA parameters for a second link. The wireless communication device receives a first physical protocol data unit (PPDU) from a station on the first link during a transmission opportunity (TXOP) and receives a second PPDU from the station on the second link during the TXOP. A start time of the first PPDU and a start time of the second PPDU are aligned.