Dormant Secondary Cell Positioning Processing to Reduce UE Power
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Solution Overview
Problem
The challenge in 5G wireless communication systems is the inefficient handling of positioning signals in secondary cells, leading to increased power consumption and latency due to the monitoring of physical downlink control channels, which is not optimized for dormant states.
Innovation Solution
A user equipment (UE) is configured to receive a dormant indication of a secondary cell's state and respond by inhibiting the monitoring of its physical downlink control channel, allowing for selective processing of positioning signals based on their bandwidth configuration and the presence or absence of measurement gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE monitors the physical downlink control channel of the secondary cell while in dormant state, then positioning signal processing can be performed, but power consumption increases
Solution Approach 1:
The patent implements dynamic state management for secondary cells, allowing the UE to switch between dormant and active states based on positioning requirements. The dormant state inhibits PDCCH monitoring to save power, while the active state enables full positioning signal processing. This dynamic transition resolves the contradiction by adapting the monitoring behavior to actual positioning needs rather than maintaining a fixed state.
Solution Approach 2:
The patent changes the operational parameters of the secondary cell by introducing a dormant state that modifies the monitoring behavior. Specifically, it alters the PDCCH monitoring configuration parameter to be inhibited during dormant state, while maintaining the capability to process positioning signals. This parameter change enables the system to achieve power savings without permanently losing positioning functionality.
2Measurement precision
If the UE processes all positioning signals in dormant secondary cells, then positioning accuracy is maintained, but processing time and latency increase
Solution Approach 1:
The patent applies partial action by selectively processing only the necessary portions of positioning signals based on the dormant state configuration. Instead of processing all positioning signals uniformly, the UE processes signals according to the specific dormant state parameters and measurement gap availability. This partial processing approach reduces latency while maintaining sufficient positioning accuracy for the given conditions.
3Reliability
If the UE activates full monitoring of secondary cells for positioning signals, then positioning reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the positioning signal processing into distinct operational modes based on the dormant state. The processing is divided into: (1) full processing mode when the secondary cell is active, (2) partial processing mode during dormant state with measurement gaps, and (3) minimal processing when dormant without measurement gaps. This segmentation allows the system to maintain reliability through appropriate mode selection while reducing complexity by avoiding unnecessary processing in dormant states.
Data Source
AI summary
A UE includes a processor configured to: receive, in a primary cell, a dormant indication of a dormant state of a secondary cell; and respond to receiving the dormant indication by implementing the dormant state of the secondary cell by inhibiting monitoring of a physical downlink control channel of the secondary cell; where the processor is configured to respond to a positioning signal including a first portion that is configured within a bandwidth of the secondary cell and that is received while the secondary cell is in the dormant state by: withholding processing of the positioning signal; or withholding processing of the first portion of the positioning signal and processing a second portion, if any, of the positioning signal that is configured outside the bandwidth of the secondary cell; or processing the positioning signal.