WLAN Channel Time Reservation for Real-Time Packet Latency
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Solution Overview
Problem
Current wireless communication systems using CSMA/CA fail to distinguish between real-time and non-real-time packets, leading to significant latency issues in transmitting time-sensitive real-time application packets due to random channel access and collision avoidance mechanisms.
Innovation Solution
The technology allows stations to identify and separate real-time packets from non-real-time packets, reserving future channel time for real-time packets, enabling scheduled transmission and minimizing latency by using a dedicated channel access scheme that prioritizes real-time traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CSMA/CA random channel access is used for all packets, then overall network throughput is improved, but latency for real-time packets increases significantly
Solution Approach 1:
The patent segments channel access into two distinct mechanisms: random channel access for non-real-time packets and scheduled channel access for real-time packets. This segmentation allows each packet type to use the access method best suited to its requirements, resolving the contradiction between overall throughput and real-time latency.
Solution Approach 2:
The patent implements preliminary channel time reservation for real-time packets before actual transmission. By scheduling future channel time in advance and allowing early channel occupation, the system prepares the channel for real-time traffic ahead of time, eliminating the need for random contention and reducing latency while preserving overall network efficiency.
2Speed
If channel contention period is shortened to accelerate access, then channel access speed is improved, but packet collision probability increases
Solution Approach 1:
The patent allows stations to occupy the channel before the scheduled channel time for real-time packet transmission. This preliminary channel occupation eliminates the need for short contention periods and reduces collision probability by reserving the channel in advance for guaranteed low-latency transmission.
3Reliability
If channel contention period is lengthened to avoid collisions, then packet delivery success rate is improved, but latency for real-time packets increases
Solution Approach 1:
The patent implements future channel time reservation that allows stations to secure channel access in advance of actual transmission needs. This preliminary reservation ensures high delivery success rates for real-time packets without requiring long contention periods, as the channel is pre-allocated and ready for immediate transmission when needed.
Solution Approach 2:
The patent creates a dynamic channel access system where real-time packets use scheduled access with pre-reserved time slots while non-real-time packets continue using random access. This dynamic differentiation allows real-time packets to achieve both high delivery success rates and low latency simultaneously.
Data Source
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AI summary
A wireless communication circuit configured for communicating over a wireless local area network (WLAN) in its reception area to communicate real-time application (RTA) packets as well as non-real time (non-RTA) packets while utilizing carrier sense multiple access/collision avoidance (CSMA / CA). An RTA scheduling table is utilized for tracking active RTA sessions and managing transmission times for RTA traffic. Scheduling of channel time based on the expected RTA packet arrival time, and rejecting other packet transmissions during the scheduled channel time for RTA packet.