On-Demand DL PRS Signaling for Low-Latency Wireless Positioning
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting and receiving signals, particularly in scenarios requiring high communication capacity, massive machine type communications, and supporting services sensitive to reliability and latency, with a need for improved positioning methods.
Innovation Solution
A method and apparatus for transmitting and receiving signals in a wireless communication system, involving the transmission of request information for downlink positioning reference signals (PRS) through predefined PRACH preambles or sequences, allowing for requests related to the number of transmission and reception points, PRS resources, bandwidth, and repetition, with support for beam directions and resource cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If downlink positioning reference signals (PRS) are transmitted continuously, then positioning accuracy is improved, but network resource consumption increases
Solution Approach 1:
The patent implements dynamic PRS transmission where the base station adjusts PRS transmission based on terminal requests and positioning requirements. The system transitions from static continuous transmission to dynamic on-demand transmission, allowing the network to allocate PRS resources flexibly according to actual positioning needs, thereby improving positioning accuracy when required while reducing unnecessary network resource consumption during normal operation
Solution Approach 2:
The terminal device autonomously determines positioning needs and sends requests to the base station for PRS transmission. This self-service mechanism allows the system to activate positioning functionality only when actually needed, avoiding continuous transmission and reducing network resource waste while maintaining positioning accuracy on demand
2Loss of time
If on-demand PRS requests are implemented, then positioning latency is reduced, but system complexity increases
Solution Approach 1:
The patent establishes pre-configured PRACH preambles and sequences that are associated with specific PRS request types before actual positioning operations begin. This preliminary configuration allows the terminal to directly use predefined resources for positioning requests without complex real-time resource allocation negotiations, reducing positioning latency while keeping the interaction protocol relatively simple
Solution Approach 2:
The base station acts as an intermediary that receives positioning requests from terminals, determines appropriate PRS transmission parameters, and coordinates the positioning process. This centralized mediation simplifies the overall system architecture by consolidating complex decision-making logic in the base station, reducing terminal complexity while enabling fast on-demand positioning responses
3Productivity
If multiple PRACH preambles are used for different requests, then resource allocation efficiency is improved, but device complexity increases
Solution Approach 1:
The patent divides the PRACH preamble resource pool into multiple groups, where each group is dedicated to specific types of positioning requests (e.g., DL PRS requests, UL RS requests, or combined requests). This segmentation allows terminals to quickly identify and use appropriate preambles for their specific needs without having to process or manage all possible preamble types, improving resource allocation efficiency while keeping terminal implementation relatively simple
Data Source
AI summary
On-demand downlink positioning (DL PRS) procedure in a wireless communication system, in which a terminal may transmit request information including information regarding a number of DL PRS resources, information regarding a DL PRS resource bandwidth, and information regarding a DL PRS resource repetition, receive DL PRS configuration information, and receive one or more DL PRSs based on the DL PRS configuration information.