CSI-RS Based Positioning in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately performing positioning in congested areas and in-building environments due to resource shortages and increased data traffic, particularly with the explosive growth of data services, necessitating advanced technologies like dual connectivity, massive MIMO, and Non-Orthogonal Multiple Access. Additionally, there is a need to manage collisions between positioning reference signals and channel state information-reference signals (CSI-RS) transmissions.
Innovation Solution
A method for user equipment (UE) in a wireless communication system that receives assistance data including CSI-RS configuration information, measures reference signal time difference (RSTD) using CSI-RS from reference and neighbor cells, and reports it to the serving base station, while dropping transmissions to prevent collisions between CSI-RS and positioning reference signal (PRS) transmissions when they occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CSI-RS and PRS transmissions are performed simultaneously, then resource utilization is improved, but signal collision and measurement accuracy deteriorate
Solution Approach 1:
The patent implements periodic transmission of CSI-RS and PRS signals with configured periodicities and subframe offsets. By scheduling these reference signals in periodic intervals rather than continuous transmission, the system achieves resource utilization while avoiding simultaneous collisions that would degrade measurement accuracy.
Solution Approach 2:
The patent dynamically adjusts the transmission configuration of CSI-RS and PRS based on measured collision conditions and network requirements. The base station can modify periodicity, subframe offsets, and resource allocations in response to changing traffic conditions and positioning accuracy requirements, optimizing both resource utilization and measurement precision adaptively.
2Measurement precision
If positioning reference signal (PRS) transmission is performed, then positioning accuracy is improved, but collision with CSI-RS transmission increases
Solution Approach 1:
The patent introduces an intermediary scheduling mechanism at the base station that coordinates PRS and CSI-RS transmissions. This intermediary function examines the transmission schedules of both signal types and adjusts their timing relationships to prevent collisions, thereby maintaining positioning accuracy while avoiding harmful interference with CSI-RS measurements.
Solution Approach 2:
The patent performs preliminary scheduling and configuration of PRS and CSI-RS transmissions before actual signal transmission. By pre-configuring periodicities, subframe offsets, and resource allocations, the system proactively prevents signal collisions before they occur, ensuring positioning accuracy is maintained without harmful interference.
3Measurement precision
If CSI-RS transmission is performed for channel state information, then channel estimation accuracy is improved, but collision with PRS transmission occurs
Solution Approach 1:
The patent employs periodic transmission patterns for both CSI-RS and PRS with configurable periodicities and subframe offsets. This periodic structure ensures that channel state information measurements and positioning measurements are performed at regular intervals without simultaneous collisions, maintaining both channel estimation accuracy and transmission reliability.
Solution Approach 2:
The patent dynamically adjusts CSI-RS transmission parameters including periodicity, subframe offsets, and resource allocations based on observed collision conditions and network performance. This dynamic adaptation ensures that channel estimation accuracy is maintained while preventing collisions that would compromise transmission reliability.
Data Source
AI summary
Disclosed is a method for performing positioning by a user equipment (UE) in a wireless communication system, including: receiving assistance data including reference cell information and neighbor cell information from a serving base station (BS), the reference cell information and the neighbor cell information including channel state information-reference signal (CSI-RS) configuration information for measurement related to CSI-RS-based positioning; receiving a CSI-RS from each of a reference cell and at least one neighbor cell on the basis of the received assistance data; measuring a reference signal time difference (RSTD) regarding the reference cell of the at least one neighbor cell using the received CSI-RS; and reporting the measured RSTD to the serving BS.