Consecutive PDCCH Slot Scheduling for UE Micro-Sleep Power Saving
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Solution Overview
Problem
Existing communication technologies face challenges in meeting the requirements of low complexity, low cost, and power saving for certain types of user equipment (UE) while ensuring adequate coverage enhancement.
Innovation Solution
The proposed solution involves transmitting Physical Downlink Control Channels (PDCCHs) in multiple consecutive slots, allowing the UE to wake up once and enter a micro-sleep state after receiving consecutive PDCCHs, thereby reducing power consumption and improving coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If PDCCH is transmitted in non-consecutive slots, then UE can enter micro-sleep state between transmissions, but power consumption increases due to frequent wake-up operations
Solution Approach 1:
The patent implements periodic PDCCH transmission at fixed slot intervals, allowing the UE to enter micro-sleep states between periodic transmissions. This periodic pattern reduces power consumption by minimizing wake-up frequency while maintaining reliable communication through predictable transmission timing.
Solution Approach 2:
The patent dynamically adjusts the micro-sleep duration and PDCCH transmission timing based on channel conditions and UE state. By making the transmission pattern adaptive rather than static, the system optimizes the balance between power saving and coverage enhancement in real-time.
2Use of energy by moving object
If PDCCH transmission interval is extended, then power consumption decreases, but transmission reliability and coverage are degraded
Solution Approach 1:
The patent performs preliminary actions by transmitting PDCCH in advance with sufficient timing margin, allowing the UE to complete processing before entering micro-sleep state. This ensures that control information is delivered reliably before power-saving mode activates, maintaining transmission efficiency while enabling power consumption reduction.
Solution Approach 2:
The patent maintains continuity of useful action by ensuring PDCCH transmissions occur at optimal intervals that keep the UE in active state just long enough to receive necessary control information, then immediately transition to micro-sleep. This continuous optimization balances power saving with transmission efficiency.
3Reliability
If UE remains in active state continuously, then transmission reliability is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic monitoring of PDCCH transmissions rather than continuous monitoring, allowing the UE to enter micro-sleep states between periodic check points. This periodic approach maintains communication reliability by checking for transmissions at regular intervals while dramatically reducing power consumption compared to continuous active state.
Solution Approach 2:
The patent enables the UE to self-manage its power state by autonomously entering and exiting micro-sleep states based on detection of PDCCH transmission patterns. The UE serves itself by making intelligent decisions about when to remain active and when to power down, reducing the need for continuous network control while maintaining reliability.
Data Source
AI summary
A physical downlink control channel (PDCCH) transmission method, applicable to a base station, includes: transmitting, in multiple slots, PDCCHs to a UE; wherein the PDCCHs in at least two slots of the multiple slots are consecutive in time domain.