Reference Signal Occasion Selection for Power Saving
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Solution Overview
Problem
In wireless communications, particularly in systems like LTE and 5G, wireless devices face challenges in minimizing active time during inactive periods to conserve power while maintaining reliable connections, as existing methods often result in increased power consumption when returning to an active state during reference signal occasions close to the active period.
Innovation Solution
The solution involves selecting a reference signal occasion that is farther in time from the active period, allowing the device to transition back to an inactive state before the active period begins, by identifying a first and second reference signal occasion with durations that meet specific threshold criteria for transitioning between inactive and active states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference signal occasion close to the active period is selected, then time and frequency tracking accuracy is improved, but power consumption increases due to extended active time
Solution Approach 1:
The patent changes the timing parameter of the reference signal occasion selection by introducing a threshold duration based on transition time. Instead of always selecting the closest reference signal occasion, the system selects based on whether the duration meets the threshold criteria, thereby optimizing the balance between tracking accuracy and power consumption.
2Reliability
If the device transitions to active state frequently to receive reference signals, then connection reliability is maintained, but power consumption increases
Solution Approach 1:
The patent modifies the state transition parameter by establishing a threshold duration that incorporates the transition time from inactive to active state. This ensures that the device only transitions to active state when necessary and appropriate, maintaining connection reliability while minimizing unnecessary power consumption from frequent transitions.
3Use of energy by moving object
If a reference signal occasion farther from the active period is selected, then active time is minimized for power saving, but transition time constraints may not be met
Solution Approach 1:
The patent introduces a threshold duration parameter that is calculated based on the transition time from inactive to active state. This threshold serves as a constraint that ensures selected reference signal occasions are far enough to save power but close enough to meet transition reliability requirements, thus resolving the contradiction between power saving and transition reliability.
4Use of energy by moving object
If the device remains in inactive state longer, then power consumption is reduced, but time and frequency tracking accuracy deteriorates
Solution Approach 1:
The patent optimizes the timing parameter by selecting reference signal occasions that satisfy the threshold duration criterion. This ensures that the device wakes up at optimal moments that balance power consumption with maintaining sufficient time and frequency tracking accuracy, avoiding both excessive active time and insufficient tracking precision.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Multiple reference signal occasions may occur during an inactive period of a discontinuous reception cycle configured for a wireless device. An amount of time the UE will be awake during the discontinuous reception cycle if the UE wakes up during a reference signal occasion of the multiple reference signal occasions may be determined for each of the reference signal occasions. The UE may wake up during the reference signal occasion associated with the shortest amount of awake time relative to the other reference signal occasions.