On-Demand PRS Session Scheduling for 5G Positioning
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently scheduling on-demand positioning reference signal (PRS) sessions at a future time, particularly due to indeterminable parameters associated with mobile sidelink anchors.
Innovation Solution
A method is introduced where a user equipment (UE) requests to schedule an on-demand PRS positioning session at a future time, specifying a set of parameters, and receives a PRS configuration based on the availability of these parameters at the future time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If on-demand PRS positioning session is scheduled at a future time, then positioning accuracy is improved, but parameter availability becomes indeterminable
Solution Approach 1:
The patent applies preliminary action by requesting and reserving positioning parameters in advance before the actual positioning session occurs. The UE sends a positioning session request message that includes parameter requests for future time slots, allowing the network to prepare and allocate resources beforehand. This resolves the contradiction by obtaining parameter information preliminarily, ensuring both positioning accuracy and parameter availability.
Solution Approach 2:
The patent implements feedback mechanisms where the network entity responds to positioning session requests with parameter availability information. The system exchanges messages between UE and network entity to confirm parameter allocation and session scheduling. This feedback loop ensures that parameter availability is communicated back to the requesting entity, resolving the indeterminability issue while maintaining positioning accuracy.
2Productivity
If PRS configuration is optimized in advance, then spectral efficiency is improved, but scheduling flexibility is reduced
Solution Approach 1:
The patent applies dynamics by making the PRS configuration adaptable and changeable based on actual conditions. The system allows parameter modifications and session rescheduling through feedback mechanisms. The configuration is not fixed but can be adjusted dynamically based on network conditions, UE mobility, and resource availability, thus maintaining both spectral efficiency and scheduling flexibility.
Solution Approach 2:
The patent utilizes parameter changes by allowing the PRS configuration parameters to be modified based on actual positioning needs and network conditions. The system supports parameter updates and reconfiguration messages that enable optimization of spectral efficiency while maintaining the ability to adapt to changing conditions, thus resolving the contradiction between optimization and flexibility.
3Loss of time
If positioning parameters are requested in advance, then latency is reduced, but signaling overhead is increased
Solution Approach 1:
The patent applies universality by designing a multi-functional positioning session request message that combines multiple operations in a single signaling exchange. The message simultaneously requests parameter allocation, schedules the positioning session, and initiates the configuration process. This reduces the number of separate signaling messages needed, thereby reducing overhead while maintaining low latency through advance parameter requests.
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a position determination entity (PDE) receives a request to schedule an on-demand PRS positioning session of a UE at a future time, wherein the request is configured to request a first set of parameters for the scheduled on-demand PRS positioning session, with an availability of one or more parameters of the first set of parameters at the future time being indeterminable when the request is received. PDE determines the availability of the one or more parameters at the future time. PDE determines a PRS configuration for the scheduled on-demand PRS positioning session in advance of the future time.