Multiband WLAN Data Path Transfer via FST Negotiation
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Solution Overview
Problem
Current multiband wireless communication systems face challenges in seamlessly transferring data streams between frequency bands, particularly from high-bandwidth but directional 60 GHz to omnidirectional bands like 5 GHz or 2.4 GHz, leading to potential disruptions in service due to differences in quality of service and data packet sizes.
Innovation Solution
The introduction of a 'Switching Streams Parameters' information element allows wireless devices to negotiate and modify existing data stream parameters when switching between frequency bands, ensuring a smooth transition by including details such as the number of streams, stream IDs, sequence numbers, and setup parameter updates, enabling the continuation of data exchanges without re-establishing traffic streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data streams are transferred from 60 GHz band to lower frequency bands (5 GHz or 2.4 GHz), then omnidirectional coverage and line-of-sight independence are improved, but available bandwidth and data transfer rates deteriorate
Solution Approach 1:
The system dynamically selects between 60 GHz and lower frequency bands based on real-time communication conditions. When line-of-sight is blocked or coverage is needed, the system switches to omnidirectional lower bands. When high data rates are required and conditions permit, it switches to 60 GHz band, creating a dynamic adaptation to environmental conditions.
Solution Approach 2:
The wireless communication system is designed to operate universally across multiple frequency bands (60 GHz, 5 GHz, and 2.4 GHz), allowing it to perform both high-speed directional communication and omnidirectional coverage functions within a single system architecture.
2Reliability
If Fast Session Transfer (FST) is implemented for seamless band switching, then service continuity is improved, but negotiation complexity and setup time worsen
Solution Approach 1:
The system performs preliminary negotiation of data stream parameters (number of streams, stream IDs, sequence numbers, setup parameters) before the actual band switching occurs. This advance preparation ensures that when the transfer happens, the parameters are already agreed upon, reducing complexity during the critical transfer moment.
Solution Approach 2:
The FST mechanism acts as an intermediary layer between the application layer and the physical radio interface. It manages the complex negotiation and transfer process transparently, shielding the application from the complexity while ensuring seamless service continuity.
3Adaptability or versatility
If data stream parameters are modified during band switching, then adaptability to new band conditions is improved, but data exchange continuity and quality of service worsen
Solution Approach 1:
The system incorporates feedback mechanisms where the receiving device responds to FST setup requests with confirmation of accepted parameters or alternative proposals. This bidirectional negotiation ensures that modified parameters still maintain quality of service requirements while adapting to the new band's capabilities.
Data Source
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AI summary
Data path transfer is set up between concurrently operating frequency bands of multiband WLAN devices. The Fast Session Transfer (FST) is enhanced by introducing a new Information Element (IE) in the FST frames to enable negotiating the parameters to be established as a result of switching of a portion of the existing data/traffic streams to another frequency band. The new IE includes the number of streams being switched and for each stream being switched the stream ID. The new IE enables wireless transmitting and receiving devices to negotiate connection setup parameters associated with a requested transfer of the operating frequency band. Transmitting device sends an FST Setup Request frame with the new IE that includes the requested number of streams being switched and for each requested stream being switched the ID. Receiving device replies with an FST Setup Response frame accepting the parameters or with an alternate number of streams.