Repeater PRS Resource Allocation for Accurate 5G Positioning
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Solution Overview
Problem
The challenge in 5G wireless communication systems is the efficient allocation and processing of positioning reference signals (PRS) to support a large number of connections and reduce latency, particularly in scenarios where user equipment (UEs) may interfere with PRS resources.
Innovation Solution
A repeater is employed to receive and process PRS resources outside the allocated bandwidth, compressing, scrambling, and de-staggering them to prevent UEs from measuring, and then transmitting these resources on the allocated bandwidth in a decompressed and staggered manner to enable accurate UE measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PRS resources are transmitted on the allocated bandwidth directly, then UEs can measure positioning signals accurately, but spectral efficiency is reduced and interference occurs
Solution Approach 1:
The patent segments the PRS transmission process into two distinct phases: a first phase where PRS resources are transmitted on an unallocated bandwidth outside the PRS allocation, and a second phase where the same PRS resources are transmitted on the allocated bandwidth. This segmentation allows the system to first occupy bandwidth resources without causing interference to UEs, then later transmit the same resources on the designated bandwidth for accurate measurement, thereby resolving the contradiction between measurement accuracy and spectral efficiency.
Solution Approach 2:
The patent applies preliminary action by transmitting PRS resources on the unallocated bandwidth before transmitting them on the allocated bandwidth. The repeater receives PRS configuration information, transmits the PRS resources on the unallocated bandwidth first (where they do not interfere with UE operations), and then transmits the same resources on the allocated bandwidth for actual measurement. This preliminary transmission on a non-interfering bandwidth enables the system to optimize spectral efficiency while maintaining measurement accuracy.
2Measurement precision
If PRS resources are transmitted on the allocated bandwidth, then UEs can perform positioning measurements, but latency increases due to processing requirements
Solution Approach 1:
The patent segments the PRS transmission into multiple time-separated phases: first transmitting PRS resources on unallocated bandwidth, then transmitting the same resources on allocated bandwidth. This temporal segmentation allows the system to perform bandwidth optimization without requiring real-time processing, thereby reducing latency while maintaining positioning measurement capability.
Solution Approach 2:
The repeater performs preliminary processing and transmission of PRS resources on the unallocated bandwidth before the actual measurement phase on the allocated bandwidth. By pre-processing and transmitting the signals in advance on a non-critical bandwidth, the system reduces the processing burden and latency during the critical measurement period.
3Adaptability or versatility
If the repeater transmits PRS resources on the allocated bandwidth, then positioning functionality is enabled, but harmful factors increase due to potential UE interference
Solution Approach 1:
The patent segments the transmission process into two phases: first transmitting PRS resources on unallocated bandwidth where UEs are not expecting signals, then transmitting the same resources on the allocated bandwidth for positioning. This segmentation prevents interference during the first phase and enables accurate measurement during the second phase, resolving the contradiction between positioning functionality and interference prevention.
Solution Approach 2:
The unallocated bandwidth acts as an intermediary medium. The repeater uses this intermediate bandwidth to transmit PRS resources before the actual measurement phase, preventing direct interference with UEs during the transmission process. The intermediary bandwidth allows the system to prepare and transmit signals without creating harmful interference, then transfer the same signals to the allocated bandwidth for positioning functionality.
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a repeater receives, from a network entity, a positioning reference signal (PRS) configuration or an indicator of the PRS configuration, the PRS configuration specifying one or more PRS resources of one or more PRS resource sets, and transmits, to one or more user equipments (UEs), a PRS waveform representing the one or more PRS resources of the one or more PRS resource sets in accordance with the PRS configuration.