Dynamic Uplink Positioning for Inactive UEs Across Cell Changes
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Solution Overview
Problem
Existing uplink positioning methods for inactive devices, such as RedCap devices, face challenges in maintaining positioning sessions efficiently while minimizing power consumption and signaling overhead, especially when UE mobility is involved.
Innovation Solution
A method for configuring inactive UEs with a positioning-specific association between sounding reference signal (SRS) indices and downlink resources, allowing for periodic updates and reporting behaviors using short data transmission (SDT) without transitioning to RRC connected state, thereby maintaining UL positioning sessions across cell changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inactive UEs transition to RRC connected state to maintain positioning sessions, then positioning reliability is improved, but power consumption increases
Solution Approach 1:
The network performs preliminary actions by pre-configuring positioning parameters and maintaining positioning session information in the inactive state. The gNB stores positioning-related configurations and anticipates the need for positioning by keeping relevant data ready, so when positioning is needed, the UE can resume without full state transition, thus maintaining reliability while reducing power consumption.
Solution Approach 2:
The patent introduces dynamic state management where the UE can remain in inactive state while the network dynamically adjusts positioning session parameters. The system allows flexible resumption from inactive state without requiring full RRC connection establishment, enabling the UE to adapt its state based on positioning needs while minimizing energy expenditure.
2Measurement precision
If full RRC connection is established for positioning, then positioning accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential positioning-related parameters and session information from the full RRC connection state. By separating positioning functionality from the complete connection state, the system can maintain positioning accuracy while using significantly reduced signaling overhead, as only critical positioning parameters need to be transmitted rather than the entire connection configuration.
Solution Approach 2:
The positioning session is segmented into independent parameters that can be maintained separately from the full RRC connection. The network manages positioning session information as distinct from general connection state, allowing selective resumption of only positioning-related functions when needed, thus reducing overall signaling overhead while preserving positioning accuracy.
3Use of energy by moving object
If positioning session is maintained in inactive state, then power saving is improved, but positioning reliability deteriorates due to UE mobility
Solution Approach 1:
The network implements feedback mechanisms to monitor UE location and positioning needs while in inactive state. The gNB receives and processes positioning reports from the UE and uses this feedback to dynamically adjust positioning session parameters, ensuring that positioning reliability is maintained even when the UE remains in power-saving inactive state despite mobility.
Solution Approach 2:
The network performs preliminary updates of positioning session information before the UE actually needs positioning services. By proactively maintaining and updating positioning parameters in advance, the system ensures that positioning reliability is preserved when the UE resumes from inactive state, avoiding the need for full re-establishment and thus maintaining power savings.
Data Source
AI summary
Systems, methods, apparatuses, and computer program TRP products for dynamic uplink optimization procedures for positioning of inactive devices, such as reduced capability devices and other user equipment are provided. For example, a method can include transmitting to a user equipment a positioning-specific association between a sounding reference signal index and an index of downlink resources. Also, the method can include configuring the user equipment with a reporting behavior for uplink positioning in radio resource control inactive mode. Receiving a parameter from the user equipment according to the configured reporting behavior can also be included in the method.