On-Demand Reference Signal Retry for 5G Positioning Latency
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Solution Overview
Problem
Existing 5G wireless communication systems face challenges in efficiently managing on-demand reference signals (RS) for positioning, particularly in meeting latency constraints and accommodating varying priorities of positioning requests.
Innovation Solution
A user equipment (UE) is configured to send a first on-demand RS request for positioning, with a timer to manage latency, and a second request if the first request does not receive a response within a threshold time or if a higher-priority positioning request is triggered, ensuring timely and prioritized RS acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a timer mechanism is implemented to send a second on-demand RS request when the first request does not receive a response within a threshold time, then the reliability of positioning information acquisition is improved, but the device complexity increases due to additional timer management and request retry logic
Solution Approach 1:
The system pre-configures a timer mechanism with a threshold time value before the positioning request is sent. This preliminary setup allows the system to automatically trigger a second on-demand RS request if the first request does not receive a response within the threshold time, ensuring reliable positioning information acquisition without requiring complex real-time decision-making logic.
2Adaptability or versatility
If the system sends a second on-demand RS request when a higher-priority positioning request is triggered before the threshold time expires, then the adaptability to varying positioning priorities is improved, but the loss of time increases due to potential redundant requests
Solution Approach 1:
The system dynamically adjusts its behavior based on the priority of incoming positioning requests. When a higher-priority positioning request is triggered before the threshold time expires, the system sends a second on-demand RS request to accommodate the urgent positioning need. The timer mechanism is intelligently managed to avoid redundant requests by checking the current request state and priority level before triggering the second request.
3Speed
If on-demand reference signals are transmitted frequently to meet latency constraints, then the speed of positioning response is improved, but the use of energy increases due to repeated signal transmissions
Solution Approach 1:
The system uses a timer mechanism to control the periodic transmission of on-demand reference signals. Instead of continuous transmission, the system waits for the threshold time to expire or for a higher-priority request to be triggered before sending the second on-demand RS request. This periodic action approach ensures timely positioning responses while minimizing energy consumption by avoiding unnecessary repeated transmissions.
Data Source
AI summary
A method of requesting a reference signal includes sending, from a user equipment, a first on-demand reference signal (RS) request for an RS in response to a first positioning request; obtaining, at the user equipment, a first timer value indicative of a first threshold amount of time; sending, from the user equipment, a second on-demand RS request in response to either: the first threshold amount of time passing after sending the first on-demand RS request without at least one of receiving the RS at the user equipment or decoding an RS configuration message at the user equipment or receiving, at the user equipment, a second positioning request, having a higher priority than the first positioning request, before passage of the first threshold amount of time after sending the first on-demand RS request.