UWB Slot Synchronization for FiRa and Omlox Coexistence
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Solution Overview
Problem
Devices using different UWB-based protocols face interference issues when operating on the same frequency band, leading to inefficiencies and lack of interoperability.
Innovation Solution
A method and apparatus enabling a first-protocol device to obtain scheduling information from a second-protocol device, using fixed transmission slots synchronized with the second-protocol's synchronization frames, allowing the first-protocol device to manage communications within reserved transmission slots, thereby aligning the systems in time and avoiding interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple UWB-based protocols operate on the same frequency band independently, then each protocol can maintain its own specifications and requirements, but interference between devices operating different protocols occurs and coexistence is poor
Solution Approach 1:
The patent introduces a protocol translation layer as an intermediary between different UWB protocols. This translation layer receives messages from one protocol, translates them into the format required by another protocol, and forwards them accordingly. This mediator enables devices using different UWB protocols (such as Wi-Fi Direct and Bluetooth Low Energy) to communicate without direct interference, while maintaining the integrity and specific requirements of each protocol.
Solution Approach 2:
The patent creates a universal communication framework that can handle multiple UWB protocols simultaneously. The system design allows a single device to support multiple protocol stacks and switch between them based on the communication requirements. This multi-functional approach enables the system to adapt to different protocol requirements while operating on the same frequency band, improving versatility without causing interference.
2Adaptability or versatility
If devices use different UWB protocols without coordination, then device complexity remains low, but coexistence and interoperability are poor
Solution Approach 1:
The patent segments the communication system into distinct protocol layers and translation modules. Each protocol is handled by a separate module, and the translation function is divided into discrete steps: message reception, format parsing, translation, and message transmission. This segmentation allows the system to support multiple protocols without requiring complete redesign of the entire communication stack, thereby improving interoperability while managing complexity through modular architecture.
3Productivity
If protocols share the same frequency band without time coordination, then transmission efficiency is high for individual protocols, but interference and collision increase
Solution Approach 1:
The patent implements periodic time-division multiplexing where different UWB protocols are allocated specific time slots for transmission. The system periodically switches between protocols in a coordinated manner, ensuring that only one protocol transmits at any given time on the shared frequency band. This periodic action maintains high transmission efficiency for each protocol while eliminating interference through temporal separation.
Data Source
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AI summary
To provide coexistence between a FiRa system and an Omlox system, a FiRa device obtains scheduling information from an Omlox satellite, which information defines transmission slots reserved for the FiRa system. The slots may be allocated upon GTS request by the FiRa device over the OoB. The FiRa device configures its FiRa IB unit to receive and decode the Omlox synchronization frames, i.e., RCMs. It counts the slots from the RCMs to locate in time the transmission slots reserved for the FiRa system. Upon reaching those reserved slots, the FiRa device starts managing FiRa communications within the slots. The FiRa device, as FiRa Controller, may send a Control Message to prepare a ranging exchange.