RRC Inactive Mode Positioning via PDCCH Paging
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Solution Overview
Problem
Current wireless communication systems, particularly in the context of 5G New Radio (NR), face challenges in efficiently managing radio resource control (RRC) states, especially in the inactive mode, which hinders effective positioning and parameter updates for user equipment (UE) without transitioning to the connected state.
Innovation Solution
A method and apparatus for a user equipment (UE) to monitor physical downlink control channel (PDCCH) candidates in a search space while in the RRC inactive state, receive positioning paging messages, apply updates to ongoing positioning session parameters, and transmit acknowledgments, enabling positioning operations without the need to transition to the RRC connected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE transitions to RRC connected state to perform positioning operations, then positioning accuracy and parameter updates are improved, but power consumption increases and latency increases
Solution Approach 1:
The network performs preliminary action by transmitting positioning paging messages to the UE in RRC inactive state before the UE actually needs positioning services. The UE applies parameter updates in advance while remaining in inactive state, so when positioning is needed, the UE can quickly transition to connected state or even maintain positioning operations without full connection establishment, thereby reducing power consumption and latency while ensuring positioning accuracy.
2Measurement precision
If the UE transitions to RRC connected state to perform positioning operations, then positioning accuracy and parameter updates are improved, but transition latency increases
Solution Approach 1:
The network transmits positioning paging messages to the UE in RRC inactive state before the UE needs positioning services. The UE applies parameter updates in advance while remaining in inactive state. When positioning is actually needed, the UE has already prepared the necessary parameters and can quickly transition to connected state or proceed directly to positioning measurements, significantly reducing transition latency while maintaining positioning accuracy.
Solution Approach 2:
The patent segments the positioning operation into two phases: a preparation phase where the network transmits positioning paging messages and the UE applies parameter updates while in RRC inactive state, and an execution phase where the UE performs actual positioning measurements. This segmentation allows the UE to prepare positioning parameters without establishing full RRC connection, thereby reducing transition latency when moving to the execution phase.
3Use of energy by moving object
If the UE remains in RRC inactive state to reduce power consumption, then power consumption decreases, but positioning operations cannot be performed
Solution Approach 1:
The network performs preliminary action by transmitting positioning paging messages to the UE while it remains in RRC inactive state. The UE applies parameter updates in advance during this preliminary phase. When positioning operations are needed, the UE has already prepared all necessary parameters and can quickly transition to connected state or proceed directly to measurements, thereby maintaining positioning operation capability while minimizing the time spent in high-power connected state.
Solution Approach 2:
The RRC inactive state acts as an intermediary state between RRC idle and RRC connected states. In this intermediary state, the UE can receive positioning paging messages from the network and apply parameter updates without establishing a full RRC connection. This intermediary state allows the UE to prepare for positioning operations while maintaining low power consumption, and can quickly transition to connected state when actual positioning measurements are needed.
4Productivity
If the network transmits positioning paging messages in RRC inactive state, then parameter updates are applied without connection establishment, but message delivery reliability must be ensured
Solution Approach 1:
The patent employs feedback mechanisms where the UE transmits acknowledgment messages to the network entity after receiving and applying positioning paging messages in RRC inactive state. This feedback loop ensures message delivery reliability by confirming that the UE has successfully received and processed the parameter updates. The network can retransmit messages if acknowledgment is not received, thereby ensuring reliable parameter updates without requiring full RRC connection establishment.
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) monitors one or more physical downlink control channel (PDCCH) candidates in a search space while in a radio resource control (RRC) inactive state, receives, while in the RRC inactive state, a positioning paging message from a network entity on at least one PDCCH candidate of the one or more PDCCH candidates, the positioning paging message configured to trigger an update to one or more parameters associated with an ongoing positioning session involving the UE, applies, while in the RRC inactive state, the update to the one or more parameters, and transmits, while in the RRC inactive state, an acknowledgment to the network entity in response to reception of the positioning paging message.