Relay Control Field in Wireless Frame Structure for QoS
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Solution Overview
Problem
In wireless local area networks (WLANs), the throughput of data transmission can decrease due to channel competition and quality of service (QoS) issues, especially when using direct link setup (DLS) mode, and there is a need for a method to effectively relay frames using a relay device without changing the addressing framework.
Innovation Solution
A communication method that includes inserting a relay control field in frames to indicate relayed frames and using appropriate addressing methods for relay devices, allowing for resource reservation and allocation to enable efficient frame relaying between source, relay, and destination devices, while maintaining compatibility with existing WLAN addressing frameworks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct link setup (DLS) mode is used for peer-to-peer transmission, then channel usage efficiency is improved, but reliability deteriorates due to multiple paths, attenuation, and interference
Solution Approach 1:
The patent introduces a relay device as an intermediary between source and destination devices. The relay device receives frames from the source device and forwards them to the destination device, providing a stable transmission path when direct peer-to-peer links suffer from poor channel conditions, multiple paths, attenuation, or interference.
2Reliability
If reservation-based MAC scheme is used, then stable frame transmission is improved, but device complexity increases due to resource classification and allocation
Solution Approach 1:
The patent makes the relay device a universal participant in reservation resources. Instead of creating separate reservation resource types for direct and relayed communications, the same reservation resources are used for both purposes. The relay device requests and uses reservation resources in the same manner as other devices, simplifying the resource management framework.
3Reliability
If relay device is introduced for frame transmission, then transmission stability is improved, but addressing complexity increases
Solution Approach 1:
The patent applies different addressing interpretations to different fields in the frame based on local context. The source address and destination address fields are interpreted differently depending on whether the frame is transmitted directly or via a relay device. This allows the same frame format to support both direct and relayed transmissions without increasing overall addressing complexity.
4Reliability
If coordinator is used for frame transmission, then QoS support is improved, but channel competition increases leading to reduced throughput
Solution Approach 1:
The relay device acts as a mediator that enables direct peer-to-peer transmission between source and destination devices while maintaining QoS guarantees. This eliminates the need for frames to traverse through the coordinator, reducing channel competition and improving network throughput while still providing reliable transmission with QoS support.
Data Source
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AI summary
Provided is a communication method of a coordinator in a wireless networks system that uses a reservation-based media access control (MAC). The communication method includes receiving, from a source device, a frame that requests a reservation resource for a relay device, to enable a frame that the source device transmits to a destination device to be relayed via the relay device, and allocating the reservation resource for the relay device, in response to the request.