Electronic Device Localization with Hybrid Uplink and Downlink TDoA
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Solution Overview
Problem
The uplink TDoA scheme in UWB localization is limited by the number of UEs it can accommodate due to increased collision occurrences, while the downlink TDoA scheme faces challenges with UE reception sensitivity, leading to decreased localization success rates.
Innovation Solution
A combined uplink and downlink TDoA scheme where the electronic device transmits an uplink frame with anchor and device information, and the anchor node receives timestamps from other nodes to calculate the device's location, enhancing both schemes' performance and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If uplink TDoA scheme is used for localization, then localization accuracy is improved, but the number of UEs accommodable in the network is limited due to increased collision occurrences
Solution Approach 1:
The patent combines uplink TDoA and downlink TDoA schemes into a hybrid localization approach. The electronic device transmits uplink frames to anchor nodes for TDoA-based localization while also receiving downlink frames from anchor nodes. This merging allows the system to maintain localization accuracy through uplink TDoA while utilizing downlink TDoA to accommodate more devices by having anchor nodes transmit signals that multiple UEs can receive simultaneously, thereby reducing collision issues.
2Quantity of substance
If downlink TDoA scheme is used for localization, then network capacity is improved, but UE reception sensitivity is insufficient leading to decreased localization success rate
Solution Approach 1:
The hybrid scheme merges the advantages of both uplink and downlink TDoA approaches. While downlink TDoA provides high network capacity by allowing multiple UEs to receive anchor node signals simultaneously, the system supplements this with uplink TDoA where selected UEs transmit frames to anchor nodes. This combination ensures that even when downlink reception sensitivity is insufficient, the uplink transmission path can compensate, thereby maintaining high localization success rates while preserving network capacity.
Solution Approach 2:
The patent introduces a hybrid TDoA mechanism that acts as an intermediary between pure uplink and pure downlink schemes. The system dynamically selects and combines uplink and downlink frame transmissions based on conditions such as UE reception capability, network load, and localization requirements. This intermediary approach allows the system to adaptively balance between network capacity and localization success rate by utilizing the strengths of both transmission directions.
Data Source
AI summary
An electronic device including a communication circuit and at least one processor is disclosed. The at least one processor is configured to receive at least one downlink frame to be used for localization of the electronic device in a downlink time period from at least one anchor node through the communication circuit, transmit an uplink frame including anchor information indicating the at least one anchor node and device identification information about the electronic device in an uplink time period through the communication circuit, and receive location information indicating a location of the electronic device calculated based on the uplink frame from the at least one anchor node through the communication circuit.