Downlink PRS Triggering for On-Demand Wireless Positioning
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Solution Overview
Problem
The existing method of periodically sending downlink positioning reference signals (PRS) leads to a waste of wireless resources since the terminal may not always need them, resulting in unnecessary transmission when there is no positioning demand.
Innovation Solution
A dynamic configuration mechanism where trigger information is used to indicate the wireless resource position for a specified number of downlink PRS transmissions, allowing on-demand transmission only when needed, reducing unnecessary periodic sending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If downlink PRS are sent periodically to facilitate terminal positioning at any time, then positioning availability is improved, but wireless resource waste increases due to unnecessary transmissions when positioning is not needed
Solution Approach 1:
The patent applies periodic action by configuring the terminal to monitor PDCCH for trigger information at regular intervals (e.g., every slot or every N slots). This periodic monitoring enables the terminal to be available for positioning when needed while avoiding continuous transmission of downlink PRS, thus resolving the contradiction between positioning availability and wireless resource waste.
Solution Approach 2:
The patent implements feedback mechanism where the network device sends trigger information via PDCCH to activate downlink PRS transmission only when positioning is required. The terminal monitors this feedback signal and adjusts its receiving behavior accordingly, enabling on-demand PRS transmission that eliminates unnecessary wireless resource consumption while maintaining positioning availability.
2Reliability
If downlink PRS are transmitted periodically based on pre-configured parameters, then positioning service is always available, but transmission resources are consumed even when positioning is not required
Solution Approach 1:
The patent applies dynamics by transitioning from static periodic transmission to dynamic on-demand transmission. The network device dynamically activates downlink PRS transmission only when positioning services are actually needed, as indicated by trigger information sent via PDCCH. This dynamic approach maintains positioning service reliability while optimizing transmission resource consumption.
Solution Approach 2:
The patent extracts the activation control mechanism from the periodic transmission framework. Instead of continuously transmitting downlink PRS based on pre-configured parameters, the system extracts the trigger condition and uses PDCCH to selectively activate transmission only when necessary, thereby reducing transmission resources while maintaining service availability.
3Productivity
If trigger information is configured to indicate wireless resource position for specified number of downlink PRS transmissions, then resource use efficiency is improved, but system complexity increases due to dynamic configuration mechanism
Solution Approach 1:
The patent applies universality by using PDCCH for multiple purposes: both downlink data transmission and trigger information for downlink PRS activation. This multi-functional use of existing control channel infrastructure improves resource use efficiency without significantly increasing system complexity, as the same physical channel and processing mechanisms are leveraged for dual purposes.
Data Source
AI summary
A method for transmitting a downlink positioning reference signal is performed by a terminal, and includes: receiving trigger information of the downlink positioning reference signal sent by a first network device, wherein the trigger information is configured to indicate a wireless resource position used by a specified number of transmissions of the downlink positioning reference signal; and receiving, at the wireless resource position indicated by the trigger information, the specified number of transmissions of the downlink positioning reference signal from a second network device.