Priority Queue Transmission in Wi-Fi for Low-Latency Services
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Solution Overview
Problem
Existing Wi-Fi networks struggle to meet the higher-priority and low-latency service requirements of applications like AR/VR and industrial control due to the CSMA/CA mechanism, which often results in lower-priority services being transmitted before higher-priority services, leading to increased latency.
Innovation Solution
A method and apparatus that prioritize the transmission of highest-priority service queues by allowing them to preempt or interrupt lower-priority queues, ensuring that data of the highest-priority service queue is transmitted first by using mechanisms such as PPDU terminators and null frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the CSMA/CA mechanism is used for data transmission, then the system maintains basic wireless communication functionality, but higher-priority services experience increased latency and cannot be transmitted promptly
Solution Approach 1:
The patent changes the transmission parameters by introducing priority-based modulation and coding schemes. Higher-priority services use more robust modulation and coding to ensure reliable transmission, while lower-priority services use less robust schemes to maximize throughput. This allows the system to maintain overall reliability while reducing latency for critical services.
Solution Approach 2:
The patent segments the data transmission into priority-based queues and time slots. High-priority services are allocated specific time slots and queues that are transmitted first, while low-priority services use remaining resources. This segmentation resolves the contradiction by ensuring critical services meet latency requirements while maintaining system-wide reliability.
2Ease of operation
If lower-priority services are transmitted first according to CSMA/CA, then the system maintains fair resource allocation, but higher-priority services experience delayed transmission
Solution Approach 1:
The patent implements dynamic resource allocation where the system adapts to real-time traffic conditions and service priorities. The scheduler dynamically adjusts which services receive transmission opportunities based on current queue states, priority levels, and latency requirements. This dynamic approach maintains fairness for low-priority services while ensuring high-priority services are transmitted promptly when needed.
Solution Approach 2:
The patent performs preliminary classification and queuing of services by priority level before transmission. High-priority services are identified and placed in dedicated queues in advance, ensuring they are ready for immediate transmission when channel conditions permit. This preliminary action resolves the contradiction by preparing critical services for fast transmission while maintaining fair allocation for other services.
3Device complexity
If the basic CSMA/CA transmission mode is used, then the system maintains simplicity in transmission mechanism, but it cannot meet the low-latency requirements of applications like AR/VR and industrial control
Solution Approach 1:
The patent segments the transmission mechanism into priority-based queues, time slots, and differential coding schemes. While this increases functional complexity, each segment remains relatively simple and modular. The segmentation allows the system to meet low-latency requirements for critical services without overwhelming complexity, as each priority level can be handled independently with straightforward rules.
Solution Approach 2:
The patent changes key transmission parameters including modulation order, coding rate, and time slot duration based on service priority. These parameter changes enable low-latency transmission for high-priority services while keeping the underlying mechanism familiar and manageable. The parameter adaptation provides the necessary performance improvement without requiring a complete redesign of the transmission system.
Data Source
AI summary
This application provides a service transmission method and an apparatus. Service queues of a first communication apparatus contend for a channel. A service queue obtains the channel through contention to obtain a data transmission opportunity. The first communication apparatus transmits data of a highest-priority service queue of the first communication apparatus in a time window corresponding to the transmission opportunity. According to the technical solutions provided in this application, the data of the highest-priority service queue can be preferably transmitted, to reduce waiting time of the highest-priority service queue to and reduce service latency.