Uplink Aggregation with Random Backoff Alignment in MLO
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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 filter feasibility limitations, particularly in synchronous PPDU transmission modes.
Innovation Solution
The proposed solution involves determining whether to wait for a second random backoff (RBO) before transmitting on a first link, allowing aligned transmission of PPDUs on multiple channels to minimize interference and maximize bandwidth, while adjusting RBO values based on channel availability and interference conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If synchronous PPDU transmission mode is used on multiple links, then bandwidth gain is improved, but in-device interference increases and filter feasibility becomes limited
Solution Approach 1:
The patent implements periodic transmission opportunities (TXOPs) on multiple links with structured timing patterns. By organizing transmissions into periodic intervals with defined start and end times, the system achieves synchronous multi-link operation while managing interference through predictable, periodic action rather than continuous transmission.
Solution Approach 2:
The patent segments the transmission medium into distinct links (first link, second link) with separate channel access mechanisms. Each link operates independently with its own random backoff counter, allowing the system to divide the overall transmission problem into manageable segments that can be controlled and optimized separately while contributing to aggregate bandwidth gain.
2Reliability
If random backoff counters are used for channel access on multiple links, then fairness to other devices is improved, but transmission latency increases due to waiting for backoff completion
Solution Approach 1:
The patent initiates random backoff counters for multiple links simultaneously in advance, before transmission is needed. By performing the backoff preparation action preliminarily and independently on each link, the system eliminates the need to wait for backoff completion on one link before starting another, thereby reducing overall transmission latency while maintaining fairness through proper backoff implementation.
Solution Approach 2:
The patent dynamically manages multiple random backoff counters that evolve independently on different links. The system adapts to channel conditions on each link separately, allowing the backoff process to proceed at different rates and complete at different times based on actual channel availability, thus optimizing both fairness and latency performance.
3Loss of time
If transmission starts when first RBO reaches zero without waiting for second RBO, then latency is reduced, but synchronized transmission alignment is lost
Solution Approach 1:
The patent performs preliminary setup of transmission parameters and timing information for multiple links before actual data transmission begins. By establishing the transmission opportunity structure and timing alignment in advance, the system can start transmissions at different times (when individual RBOs reach zero) while maintaining overall synchronization through pre-configured timing relationships.
Solution Approach 2:
The patent incorporates timing cushions and guard intervals in the transmission structure to accommodate variations in when different links become ready. By building in temporal flexibility and buffer periods beforehand, the system allows asynchronous start times without compromising the overall synchronized transmission framework, thus cushioning against misalignment while maintaining low latency.
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 determine that first random back off (RBO) for a first channel of a first link has counted down to zero. A wireless communication device may determine, when the first RBO has counted down to zero, that a second RBO for a second channel of a second link has a count down remaining. A wireless communication device may optionally transmit a medium reservation message on the first link reserving a transmission opportunity (TXOP). A wireless communication device may determine whether to wait for the second RBO before transmitting on the first link. A wireless communication device may transmit at least a first PPDU on the first link during the TXOP.