UWB Control Packet Reporting for Failed NB Ranging Cycles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Narrowband-Assisted Multi-Millisecond Ultra-Wide Band (NBA-UWB MMS) ranging systems face communication failures due to signal fading and coexistence with Wi-Fi, leading to discarded ranging cycles and power wastage when out-of-band radios are unavailable or busy.
Innovation Solution
Incorporating non-correlative assist symbols in control packets and appending report fragments with these symbols to facilitate report exchange in the control phase, reducing dependence on additional radios and improving carrier frequency offset estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If report phase is performed using NB radio, then power consumption is reduced, but communication reliability deteriorates due to signal fading and coexistence with Wi-Fi
Solution Approach 1:
The patent incorporates report fragments into control phase packets in advance, so that reporting is performed during the control phase rather than requiring a separate report phase. This preliminary integration of reporting functionality into the control phase allows the system to use the more reliable UWB radio for control communications while avoiding the need to switch to NB radio for reporting, thus maintaining both reliability and power efficiency.
Solution Approach 2:
The control phase packets are designed to carry both control information and report fragments, making them multi-functional. This allows the UWB radio to handle both control and reporting tasks, eliminating the need to use NB radio for reporting and thereby avoiding the reliability issues associated with NB radio while maintaining power efficiency.
2Reliability
If OOB radio technology is added to handle report phase failures, then communication reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes control phase packets multi-functional by incorporating report fragments into them. This allows the existing UWB radio to handle both control and reporting functions, eliminating the need to add OOB radio technology while maintaining communication reliability and avoiding increased device complexity.
Solution Approach 2:
The system uses its own UWB radio capability to handle reporting functions that would otherwise require additional OOB radio technology. By making the control phase packets carry report fragments, the system serves its own reporting needs using existing resources, avoiding the need to add complex OOB radio infrastructure.
3Reliability
If report phase is deferred to OOB radio, then communication reliability is improved, but power consumption increases due to additional radio operations
Solution Approach 1:
The patent incorporates report fragments into control phase packets in advance, so that reporting is performed during the control phase using the UWB radio. This preliminary integration eliminates the need for a separate report phase using OOB radio, thereby maintaining communication reliability while avoiding the additional power consumption that would result from activating and operating OOB radio technology.
Data Source
AI summary
A wireless device including a ranging radio and a communication radio. The ranging radio performs ranging operations for determining a relative distance measurement during a ranging phase of each of successive ranging cycles. The communication radio transmits a control packet with a payload during a control phase of a current ranging cycle, in which the payload includes multiple non-correlative assist symbols. When the report phase of the immediately prior ranging cycle is unsuccessful, the payload includes a report indicating a relative time measurement of an immediately prior ranging cycle combined with the assist symbols. The report is segmented into multiple report fragments interlaced with the assist symbols. The assist symbols are selected in a pseudo-random manner to improve a spectrum of the control packet when transmitted. The ranging radio is an ultra-wide band (UWB) radio and the communication radio is a narrowband (NB) radio.