UWB Ranging Termination Forwarding for Missed Frame Reliability
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Solution Overview
Problem
In UWB ranging systems, the lack of an ACK mechanism leads to failed data packet transmissions when receivers fail to receive critical information, causing subsequent ranging failures without retransmission, impacting positioning accuracy and reliability.
Innovation Solution
Implement a method where UWB apparatuses forward or retransmit ranging termination information frames in subsequent slots if not initially received, ensuring all apparatuses successfully receive this information, thereby improving ranging reliability without increasing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If no ACK mechanism is implemented in UWB ranging, then the system complexity is reduced, but the ranging reliability deteriorates when data packets are not received
Solution Approach 1:
The patent introduces an ACK mechanism where the responder sends an acknowledgment frame to confirm successful reception of the initiator's data packet. This feedback loop enables the initiator to detect transmission failures and trigger retransmission, thereby improving ranging reliability without significantly increasing system complexity
Solution Approach 2:
The patent introduces a forwarder node that acts as an intermediary to relay data packets and acknowledgment frames between the initiator and responder. This intermediary mechanism ensures reliable delivery even when direct communication fails, improving ranging reliability while maintaining manageable system complexity through distributed forwarding
2Reliability
If data packet retransmission is implemented when reception fails, then the ranging reliability is improved, but the ranging time increases
Solution Approach 1:
The patent implements a timeout mechanism that triggers retransmission after a predetermined time interval if an acknowledgment is not received. This preliminary action approach allows the system to proceed with timing assumptions while providing automatic retransmission capability, balancing reliability improvement with time efficiency
Solution Approach 2:
The patent implements a limited number of retransmission attempts rather than continuous retransmission. This partial action approach ensures that retransmission improves reliability while preventing excessive time consumption through a predefined maximum retry count
3Reliability
If multiple UWB apparatuses forward ranging termination information frames, then the reception reliability is improved, but the system complexity increases
Solution Approach 1:
The patent divides the task of forwarding ranging termination information frames among multiple UWB apparatuses in a distributed manner. Each apparatus independently forwards frames based on local conditions, segmenting the overall forwarding function across multiple nodes. This segmentation improves reception reliability through redundancy while managing system complexity by avoiding centralized control
Solution Approach 2:
The patent implements a mechanism where each UWB apparatus autonomously decides whether to forward ranging termination information frames based on its own reception status and timing. This self-service approach improves reliability through distributed redundancy while minimizing system complexity by eliminating the need for complex coordination protocols
Data Source
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AI summary
A UWB ranging method, apparatus and system. The UWB ranging method comprises: a UWB apparatus receiving a ranging termination information frame in a ranging report time slot, which is used for receiving the ranging termination information frame, within one ranging round ( 401); when it is determined that the ranging termination information frame has been received, the UWB apparatus forwarding the ranging termination information frame subsequent to the ranging report time slot (402); and when it is determined that the ranging termination information frame has not been received, the UWB apparatus receiving the ranging termination information frame subsequent to the ranging report time slot (403).