UWB Ranging Response Message Scheduling for Power Reduction
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Solution Overview
Problem
In wireless communication systems using ultra-wide band (UWB) technology, devices face inefficiencies in power consumption and lack of neighbor cell information for optimal ranging operations, leading to unnecessary current consumption and difficulty in determining suitable neighbor cells during movement.
Innovation Solution
An electronic device is equipped with a communication circuit and processor to receive and generate ranging response messages (RRMs) that include round indices and hop metrics, allowing it to select optimal ranging rounds and reduce power consumption by minimizing unnecessary ranging operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electronic device waits to receive UWB messages while the RX chain is continuously in the on-state, then the device can detect location accurately, but unnecessary current consumption increases and use time shortens
Solution Approach 1:
The patent implements periodic ranging operations where the RX chain is activated only during specific ranging rounds rather than continuously. The device determines which ranging rounds to participate in based on received RRM messages, enabling it to periodically wake up and perform location detection only when necessary, thus reducing overall power consumption while maintaining detection capability
Solution Approach 2:
The device uses information from overheard RRM messages to autonomously determine its own scheduling for ranging operations. By extracting round index and cost metric information from neighbor cell RRMs, the device self-configures its active ranging rounds without continuous network control, enabling energy-efficient autonomous operation
2Loss of information
If the device performs ranging operations in all neighbor cells, then complete location information is obtained, but device complexity and processing overhead increase
Solution Approach 1:
The patent extracts only the essential information from RRM messages - specifically the round index and cost metric - that is needed to determine optimal ranging participation. Rather than processing complete RRM contents or maintaining full neighbor cell state, the device extracts minimal necessary data to make scheduling decisions, reducing processing complexity while retaining decision-making capability
Solution Approach 2:
The patent introduces a cost metric parameter that quantifies the suitability of different neighbor cells for ranging operations. By converting complex neighbor cell evaluation into a simple cost metric comparison, the device can efficiently select optimal cells without complex analysis, transforming a complex multi-parameter evaluation into a straightforward parameter-based selection process
Data Source
AI summary
According to various embodiments, an electronic device may include a communication circuit; and at least one processor operatively connected to the communication circuit, wherein the at least one processor is configured to: receive, via the communication circuit from at least one external electronic device in a first active ranging round within a first ranging block, a ranging response message (RRM) including a first round index of a first ranging round in which the at least one external electronic device performs a first ranging operation as an initiator in a neighbor cell, and a number of hops between a reference cell in which a reference external electronic device exists and the neighbor cell, and select a second active ranging round in which the electronic device performs a second ranging operation in a second ranging block based on at least the RRM.