Trigger Frame Random Access Latency Reduction
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Solution Overview
Problem
Existing wireless network technologies, such as WLAN systems, face challenges in rapidly transmitting latency-sensitive data, which is critical for real-time services like augmented reality and robot control.
Innovation Solution
The proposed solution involves an apparatus and method that utilize a trigger frame to instruct devices to transmit latency-sensitive data through a random access frequency band at an intermediate transmission time within a PPDU transmission period, ensuring minimal latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If data is transmitted through traditional scheduled transmission methods in WLAN systems, then transmission reliability is maintained, but latency increases and real-time service requirements cannot be met
Solution Approach 1:
The frequency band is segmented into scheduled transmission bands and random access frequency bands. The random access frequency band is specifically allocated for latency-sensitive data transmission, allowing devices to transmit immediately when data arrives without waiting for scheduled transmission opportunities. This segmentation enables simultaneous operation of reliable scheduled transmission and low-latency random access transmission.
Solution Approach 2:
A trigger frame is introduced as an intermediary control mechanism. The access point sends trigger frames that contain random access resource allocation information, guiding stations on when and where to transmit latency-sensitive data. This intermediary coordination maintains system reliability while enabling rapid random access transmission.
2Productivity
If random access frequency bands are allocated for latency-sensitive data transmission, then transmission speed increases, but system complexity increases due to additional resource management requirements
Solution Approach 1:
The trigger frame serves multiple functions: it schedules regular data transmission, allocates random access resources, and provides uplink transmission timing information. By consolidating these control functions into a single universal message structure, the system achieves rapid random access transmission without proportionally increasing complexity.
Solution Approach 2:
The access point pre-allocates random access frequency bands and timing opportunities through trigger frames before latency-sensitive data needs to be transmitted. This preliminary resource preparation eliminates the need for complex real-time resource negotiation when urgent data arrives, reducing both latency and operational complexity.
Data Source
AI summary
An operating method of a first apparatus communicating with a second apparatus in a wireless network includes: receiving, from the second apparatus, a trigger frame including information about a random access frequency band and information about an intermediate transmission time, and transmitting a physical layer convergence procedure (PLCP) service data unit (PSDU) including a short training field (STF) and first data to the second apparatus through the random access frequency band at the intermediate transmission time, wherein the intermediate transmission time is in a physical layer protocol data unit (PPDU) transmission period.