UWB Locating Circuit Timing for Frequency Band Utilization Limits
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Solution Overview
Problem
The increasing number of device units communicating with a vehicle's transceiver via ultra-wideband radio leads to overloading of the frequency band, exceeding permissible transmission limits and causing uncoordinated, pseudo-random transmission times, which violates regulatory constraints.
Innovation Solution
A circuit apparatus with a monitoring unit that controls the emission of locating signals within predetermined time blocks, checks for compliance with frequency band utilization conditions, and blocks transmissions if these conditions are not met, ensuring that the transmission criteria for maximum frequency band utilization are adhered to, including prioritization of signals based on importance and adjusting criteria according to the number of simultaneously running sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of device units communicating with the circuit apparatus increases, then the locating capability is improved, but the frequency band becomes overloaded and transmission time slice increases
Solution Approach 1:
The monitoring unit checks transmission conditions before actual transmission occurs. It predicts whether transmitting a locating signal would exceed the maximum degree of utilization, and only permits transmission if conditions are satisfied. This preliminary check prevents overloading before it happens.
Solution Approach 2:
The monitoring unit continuously monitors the frequency band utilization by tracking the number of transmitted locating signals in a time interval and the accumulated duration of their emission. This feedback mechanism dynamically adjusts transmission permissions to maintain compliance with maximum utilization limits.
2Ease of operation
If device units transmit locating signals with pseudo-random timing, then transmission coordination is simplified, but transmissions accumulate in an uncoordinated manner causing frequency band overloading
Solution Approach 1:
The monitoring unit acts as an intermediary between device units and the frequency band. It receives transmission requests from device units, checks them against utilization conditions, and either permits or blocks transmission. This intermediary function coordinates otherwise uncoordinated pseudo-random transmissions to prevent overloading.
3Quantity of substance
If the transmission time slice increases to accommodate more locating signals, then more device units can be serviced, but regulatory limits on frequency band utilization are exceeded
Solution Approach 1:
The system dynamically adjusts the effective transmission time slice based on real-time monitoring of frequency band utilization. When utilization approaches the maximum degree, the monitoring unit blocks additional transmissions, effectively reducing the transmission time slice. This dynamic adjustment maintains regulatory compliance while maximizing service capacity.
Data Source
AI summary
A circuit apparatus for locating a device unit in a respective locating session communicating bidirectionally with the device unit via ultra-wide-band radio in a predetermined common frequency band, comprises a control unit configured to control a transceiver unit of the circuit apparatus to emit a respective locating signal to the respective device unit in successive time blocks of a predetermined time grid of the locating session. The circuit apparatus comprises a monitoring unit configured to check, before the respective transmission of a locating signal to be transmitted, whether a predetermined transmission condition specifying a maximum permissible degree of utilization for the frequency band is fulfilled by the transmission of the locating signal to be transmitted, to enable the emission of the locating signal to be transmitted if the transmission condition is fulfilled, and otherwise to block the emission of the locating signal to be transmitted.