Dormant Secondary Cell Positioning Without PDCCH Monitoring
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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 need to monitor physical downlink control channels, which is not optimized for dormant secondary cells.
Innovation Solution
Implementing a dormant state for secondary cells by inhibiting the monitoring of physical downlink control channels and selectively processing positioning signals based on the presence or absence of measurement gaps, allowing for power-saving operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE monitors physical downlink control channels in dormant secondary cells, then positioning signal processing can be performed, but power consumption increases
Solution Approach 1:
The patent implements a dormant state for secondary cells that dynamically adjusts the monitoring behavior of physical downlink control channels. In this dormant state, the UE does not monitor PDCCH in dormant secondary cells, thereby reducing power consumption while still maintaining the capability to process positioning signals when needed. This dynamic state adjustment resolves the contradiction by allowing the system to switch between active monitoring and power-saving modes based on positioning requirements.
Solution Approach 2:
The patent applies different monitoring behaviors to different cells based on their state. Specifically, the UE monitors PDCCH in active secondary cells but not in dormant secondary cells. This local differentiation allows positioning signal processing to occur in dormant cells without the overhead of full PDCCH monitoring, thus reducing power consumption while maintaining positioning capability where needed.
2Measurement precision
If the UE processes all positioning signals in dormant secondary cells, then positioning accuracy is maintained, but latency increases
Solution Approach 1:
The patent implements partial processing of positioning signals in dormant secondary cells. Instead of processing all positioning signals, the UE selectively processes only those positioning signals that are necessary for maintaining positioning accuracy. This partial action approach reduces processing latency while still achieving the required positioning performance, resolving the contradiction between accuracy and latency.
3Reliability
If the UE monitors PDCCH in dormant secondary cells, then control channel functionality is maintained, but spectral efficiency decreases
Solution Approach 1:
The patent extracts the PDCCH monitoring function from dormant secondary cells while retaining it in active secondary cells. In the dormant state, the UE does not monitor PDCCH in dormant secondary cells, which eliminates unnecessary control channel processing and improves spectral efficiency. The control channel functionality is preserved in active cells where it is still needed, thus resolving the contradiction between reliability and spectral efficiency.
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.