Wireless Medium Reservation for Guaranteed Low-Latency Service Periods

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Solution Overview

Problem

Existing wireless communication networks face challenges in providing low latency and reliable services due to contention for accessing the wireless medium, which can disrupt the timely transmission of latency-sensitive traffic.

Innovation Solution

The introduction of a provision period prior to the start of a low latency service period, where the access point contends for and reserves the medium, ensuring that the service period is not subject to contention delays, allowing only low latency-capable stations to access during this period.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If stations contend for access to the wireless medium using traditional MAC protocols, then the medium is shared fairly among all stations, but low latency service periods cannot be guaranteed due to contention delays

Engineering Contradiction:

Improvelow latency service guaranteeVSAvoidmedium access efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The wireless medium access is segmented into two distinct phases: a provision period where the AP contends for and reserves the medium, and a service period where low latency traffic is transmitted without contention. This segmentation allows the system to guarantee low latency service while maintaining overall medium access efficiency through the structured separation of contention and service phases.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the AP reserves the medium for the entire transmission opportunity including before service period start, then low latency service is guaranteed, but other stations cannot access the medium during the provision period reducing overall network utilization

Engineering Contradiction:

Improveservice period timing guaranteeVSAvoidmedium access opportunity loss

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The AP performs preliminary action by contending for and reserving the medium during the provision period before the service period begins. This preliminary reservation ensures that when the service period starts, the medium is already secured and low latency traffic can be transmitted immediately without contention delays, while still allowing the AP to utilize the provision period for other transmissions.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If the AP allows stations to access the medium during the provision period, then overall network utilization improves, but the service period start time cannot be guaranteed due to potential contention conflicts

Engineering Contradiction:

Improvenetwork resource utilizationVSAvoidservice period start delay

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The provision period acts as an intermediary phase between general medium access and the guaranteed service period. During this intermediate period, the AP manages medium access and can allow other stations to transmit while preparing for the upcoming service period. The AP uses signaling to coordinate this transition, ensuring that the service period starts at the guaranteed time T2 while maximizing utilization of the provision period for other traffic.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12550193B2Provision period management for ensuring a low latency service in a BSS

Publication Date: 2026.02.10 CANON KK

AI summary

To make effective the usage of network resources and timely handling of low latency traffic, and in particular IEEE 802.11 networks, it is described according to an aspect of the invention a method of communication comprising, at an access-point, AP: contending for access to a wireless medium, a provision period prior a start of a low latency, LL, service period, SP, dedicated for transmitting LL traffic; and upon gaining access to the wireless medium, reserving an AP transmission opportunity encompassing the LL SP, thereby allowing transmission of LL traffic during the LL SP.