PPDU Resource Indication for Preemptive Low-Latency Allocation
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Solution Overview
Problem
Existing wireless communication systems face challenges in reducing channel access delay for low-latency traffic, particularly in real-time applications, as they cannot transmit low-latency traffic until ongoing PPDU transmissions are completed, leading to inefficiencies due to high overhead of short PPDUs.
Innovation Solution
A first station receives a resource indication for low-latency traffic within a PPDU duration, monitors the indicated resources, and decodes the received signal carrying low-latency traffic, allowing preemptive resource allocation during ongoing transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the AP STA keeps all PPDUs transmissions short, then the AP STA can start transmitting LL traffic as soon as an ongoing PPDU ends, but this solution may be inefficient because of the high overhead of PHY/MAC headers of the short PPDUs
Solution Approach 1:
The patent applies preliminary action by notifying the LL STA about future resource allocations in advance through resource indication values (RIVs) embedded in ongoing PPDUs. This allows the LL STA to prepare for upcoming transmissions ahead of time, reducing channel access delay without requiring frequent short PPDUs. The resource indications are provided beforehand, enabling the LL STA to camp on indicated resources and decode allocations efficiently when they occur.
2Reliability
If the AP STA transmits a next PPDU including the LL traffic after the LL traffic expires, then the LL traffic can be transmitted, but the latency requirement may not be met
Solution Approach 1:
The patent applies preliminary action by providing resource indications to the LL STA in advance during ongoing PPDUs. This allows the LL STA to know beforehand when and where to expect LL traffic allocations, enabling it to prepare and decode the traffic immediately upon transmission without waiting for the next PPDU cycle, thus meeting latency requirements while ensuring reliable transmission.
Solution Approach 2:
The patent uses resource indication values (RIVs) as an intermediary mechanism embedded in ongoing PPDUs to convey resource allocation information to the LL STA. This intermediary allows the AP STA to communicate future resource allocations without interrupting the current PPDU transmission, enabling the LL STA to prepare for upcoming LL traffic and reduce latency while maintaining transmission reliability.
3Ease of operation
If the AP STA transmits a next PPDU including the LL traffic after the ongoing PPDU ends, then the transmission can proceed, but the channel access delay for low-latency traffic increases
Solution Approach 1:
The patent applies preliminary action by embedding resource indication values (RIVs) in ongoing PPDUs that notify the LL STA about future resource allocations. This allows the LL STA to prepare in advance for upcoming LL traffic transmissions, reducing channel access delay without disrupting the normal PPDU scheduling operation. The resource indications are provided beforehand, enabling faster response when allocations occur.
Data Source
AI summary
The first station receives a resource indication for a resource allocation information for low latency (LL) traffic from a second station. The resource indication indicates the set of resources within a duration of a physical layer (PHY) protocol data unit (PPDU). The first station monitors the set of resources for the duration of the PPDU to receive the resource allocation information from the second station through a resource of the set of resources. The first station receives a signal carrying LL traffic from the second station for the duration of the PPDU through a resource allocated by the resource allocation information, and decodes the received signal.