SPS DL-PRS Activation for Low-Overhead 5G Positioning
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Solution Overview
Problem
The periodic DL-PRS in 5G downlink positioning results in significant resource overhead and delay due to continuous transmission, even when positioning services are not needed.
Innovation Solution
Implementing Semi-Persistent Scheduling (SPS) for DL-PRS activation and deactivation based on UE and base station coordination, allowing dynamic control of DL-PRS transmission to match positioning needs, reducing unnecessary resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic DL-PRS is configured and continuously transmitted, then positioning service is always available, but resource overhead increases and spectrum efficiency decreases
Solution Approach 1:
The patent implements dynamic activation and deactivation of DL-PRS transmission based on UE positioning requirements. The base station receives activation indication information from the UE to start DL-PRS transmission, and receives deactivation indication information to stop transmission. This dynamic control mechanism allows the system to adapt transmission resources to actual positioning needs, resolving the contradiction between continuous availability and resource overhead.
Solution Approach 2:
The patent changes the operational state parameter of DL-PRS from fixed periodic transmission to dynamically controllable activation/deactivation states. By introducing activation indication information and deactivation indication information as control parameters, the system can switch between transmission and non-transmission states based on positioning service requirements, thereby optimizing resource overhead while maintaining service availability when needed.
2Measurement precision
If periodic DL-PRS is continuously transmitted, then positioning measurement can always be performed, but positioning delay increases
Solution Approach 1:
The patent enables the UE to proactively send activation indication information to the base station when positioning measurement is needed. This preliminary action allows the base station to activate DL-PRS transmission immediately upon receiving the activation indication, rather than waiting for the next periodic transmission opportunity, thereby reducing positioning delay while maintaining measurement capability.
Solution Approach 2:
The patent implements a feedback mechanism where the UE monitors positioning service requirements and provides feedback to the base station through activation and deactivation indication information. This feedback loop enables the base station to adjust DL-PRS transmission timing based on actual positioning needs, reducing unnecessary waiting time for periodic transmissions while ensuring measurement capability is available when required.
3Adaptability or versatility
If DL-PRS is transmitted for all base stations, then comprehensive positioning coverage is achieved, but system complexity increases
Solution Approach 1:
The patent applies local quality by enabling DL-PRS transmission only for base stations that are actually needed for positioning measurements. The UE can selectively activate DL-PRS for serving base stations and/or non-serving base stations based on positioning requirements. This selective activation approach maintains comprehensive positioning coverage when needed while reducing system complexity by avoiding unnecessary configuration and transmission for all base stations.
Data Source
AI summary
Disclosed are a downlink positioning reference signal receiving and transmitting method, and a terminal, a base station, a device and an apparatus. The method includes: in response to receiving SPS DL-PRS configuration information of a plurality of base stations configured by a LMF via SPS, receiving SPS DL-PRS activation information of the plurality of base stations; where the plurality of base stations comprise a serving base station and a non-serving base station; receiving and measuring an SPS DL-PRS according to a period and time-frequency resource information of the SPS DL-PRS determined from the SPS DL-PRS configuration information and according to a downlink slot of the SPS DL-PRS determined from the SPS DL-PRS activation information, and obtaining a positioning measurement; and sending the positioning measurement to the LMF or the serving base station of the UE.