Scheduled Medium Access for Directional Multi-Gigabit Wireless
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Solution Overview
Problem
Contention-based medium access protocols in wireless communications systems, such as those following IEEE 802.11 standards, lead to inconsistent latency control, degrading performance for latency-sensitive applications like VoIP and video streaming, especially with increasing numbers of client devices.
Innovation Solution
Implementing a method in a wireless access point that transmits beacon frames defining a beacon header interval and data transmission interval divided into scheduled periods with uplink allocation request sub-periods, allowing for controlled medium access by assigning specific uplink allocation sub-periods to client devices, enabling deterministic latency management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If contention-based medium access protocol is used, then device complexity is reduced, but latency control consistency deteriorates
Solution Approach 1:
The data transmission interval is segmented into multiple scheduled periods, each containing multiple uplink allocation request sub-periods. This segmentation allows the access point to manage multiple client devices systematically while maintaining consistent latency control through structured time division.
Solution Approach 2:
The access point performs preliminary actions by assigning specific uplink allocation request sub-periods to client devices in advance through beacon frames. This preliminary assignment ensures that each client knows when to transmit, enabling deterministic latency control before actual data transmission occurs.
2Quantity of substance
If number of client devices increases, then network capacity increases, but latency control consistency deteriorates
Solution Approach 1:
The uplink allocation request sub-periods are segmented and assigned to specific client devices in a structured manner. This segmentation allows the system to accommodate multiple client devices while maintaining consistent latency control through systematic time division and assignment.
Solution Approach 2:
The access point uses feedback mechanisms through beacon frames to communicate scheduled period assignments to client devices. This feedback ensures that each client device understands its assigned timing, enabling the system to manage multiple devices with consistent latency control.
Data Source
AI summary
A method in a wireless access point (AP) for controlling medium access includes: transmitting a beacon frame defining (i) a beacon header interval (BHI), and (ii) a data transmission interval (DTI) divided into a predetermined number of scheduled periods, each scheduled period containing a set of uplink allocation request sub-periods; sending, to a client device, an uplink allocation request assignment indicating an assigned uplink allocation request sub-period from the set, that corresponds to the client device; during a current one of the scheduled periods, receiving an uplink allocation request from the client device during the assigned uplink allocation request sub-period; determining an uplink allocation sub-period for the client device based on the uplink allocation request; and during a next one of the scheduled periods, sending an indication of the uplink allocation sub-period to the client device.