UE Dormancy Signaling for Wireless Power and Sync
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, user equipment (UE) experiences unnecessary power consumption and potentially inaccurate measurements due to the difficulty in determining when base stations in dormant states are transmitting common signals, leading to inefficient energy savings and synchronization issues.
Innovation Solution
The introduction of an eNB dormant state where the transmission of common signals is suspended for a larger number of subframes, with UE provided with specific dormancy information including System Frame Number offset, DTX ON and OFF periods, and reference signal configurations to optimize cell search and radio resource management measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If UE continuously monitors common signals from base stations in dormant states, then synchronization and measurement accuracy are maintained, but power consumption increases
Solution Approach 1:
The base station enters dormant states with periodic activation intervals, transmitting common signals only at specific intervals rather than continuously. The UE is configured with dormancy information indicating when the base station will be active, allowing the UE to monitor only during these periodic active intervals rather than continuously, thereby reducing power consumption while maintaining measurement accuracy.
2Reliability
If base station transmits common signals continuously, then UE can always synchronize and measure accurately, but energy efficiency deteriorates
Solution Approach 1:
The base station provides dormancy information to the UE in advance, indicating when the base station will be in dormant state and when it will activate to transmit common signals. This preliminary information allows the UE to proactively adjust its monitoring schedule, ensuring synchronization is maintained during active periods without requiring continuous monitoring, thus improving energy efficiency while preserving synchronization reliability.
3Stability of the object's composition
If UE monitors all subframes for common signals, then no synchronization issues occur, but energy waste increases due to monitoring unnecessary subframes
Solution Approach 1:
The monitoring subframes are segmented into necessary and unnecessary portions based on the base station's dormant state pattern. The dormancy information divides the time domain into active intervals (where monitoring is necessary) and dormant intervals (where monitoring is unnecessary). The UE monitors only during segmented active intervals, maintaining synchronization stability while eliminating energy waste from monitoring unnecessary subframes.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A method comprising: receiving timing information associated with a transmission of reference information from a first cell or first network node when in a less active mode; and using said timing information to control when transmissions from said first cell or first network node are monitored for said reference information.