PRS Configuration for 5G Positioning Latency Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G wireless communication systems, User Equipments (UEs) with higher Sub Carrier Spacing (SCS) face delays in detecting Positioning Reference Signals (PRS) from neighboring cells with lower SCS, leading to increased latency and power consumption in positioning applications like E911 services, due to the need to read PRS patterns over multiple slots.
Innovation Solution
Configurable PRS patterns are introduced, allowing UEs to request and configure PRS to occupy a fraction of the slot duration based on the SCS ratio (μ) between cells, enabling faster detection and reducing latency and power consumption by adapting PRS sequence density, with control bits indicating the configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PRS patterns are configured for neighboring cells with lower SCS, then positioning coverage is improved, but detection latency increases for UEs with higher SCS
Solution Approach 1:
The patent introduces dynamic PRS configuration where the network can adaptively adjust PRS parameters (such as PRS occasion periodicity, duration, and bandwidth) based on the SCS of the serving cell and neighboring cells. This allows the system to optimize positioning performance for higher SCS UEs while maintaining compatibility with lower SCS cells, resolving the contradiction between coverage and latency.
Solution Approach 2:
The patent changes key PRS parameters including setting PRS occasion periodicity to values suitable for higher SCS (e.g., shorter periods), adjusting PRS duration to match the reduced slot length, and modifying PRS bandwidth allocation. These parameter adjustments enable higher SCS UEs to detect PRS within a single slot, reducing detection latency while maintaining positioning accuracy.
2Measurement precision
If PRS detection is performed over multiple slots to ensure reliable positioning, then positioning accuracy is improved, but power consumption increases
Solution Approach 1:
The patent configures PRS parameters in advance to match the SCS characteristics, so that higher SCS UEs can complete PRS detection within a single slot without needing to span multiple slots. This preliminary configuration ensures that positioning accuracy is maintained while eliminating the need for extended detection periods, thereby reducing power consumption.
3Adaptability or versatility
If PRS configuration follows standard slot duration, then compatibility with lower SCS cells is maintained, but detection efficiency decreases for higher SCS UEs
Solution Approach 1:
The patent applies different PRS configuration strategies for different SCS scenarios. For higher SCS cells, it uses shortened PRS durations and adjusted periodicity optimized for the faster timing, while maintaining standard configurations for lower SCS cells. This localized optimization improves detection efficiency for higher SCS UEs without compromising system-wide compatibility.
Data Source
AI summary
Disclosed is a method of configuring a Positioning Reference Signal, PRS, in each of a plurality of cells in a telecommunication network. The method of a serving base station (BS) may include transmitting a second positioning reference signal (PRS) to a user equipment (UE); receiving, from the UE, a request to request a neighbor BS to configure a first PRS to occupy (1/μ)th of slot duration of a Sub Carrier Spacing (SCS) of the neighbor BS; and transmitting the request to the neighbor BS, wherein the neighbor BS having a lower (SCS) than an SCS of the serving BS, and wherein μ is the ratio of the SCS of the serving BS to the SCS of the neighbor BS.