UE Power State Management via DL EOC Indication
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently managing power states and reducing latency during transitions, especially in scenarios with unbalanced traffic flows and urgent UL data.
Innovation Solution
The proposed solution involves a method where a UE receives a DL EOC indication to trigger a status indication, which includes the status of its buffer or delay, and an estimated time for the next UL packet. Based on this information, the network node sends a power state switching indication to the UE, allowing it to autonomously switch to different power modes and reduce unnecessary power consumption and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors downlink communications and maintains active power state, then communication reliability and response time are improved, but power consumption increases
Solution Approach 1:
The UE dynamically transitions between different power states (active, idle, sleep) based on downlink communication activity and buffer status. The network node receives buffer status reports from the UE and adjusts the UE's power state accordingly, enabling the system to adapt power consumption to actual communication needs while maintaining reliability when data is present
Solution Approach 2:
The system changes the operational parameters of the UE by transitioning between defined power states with different characteristics. The network node controls these parameter changes by receiving buffer status information and sending appropriate indications to switch the UE between power states that balance reliability and power consumption
2Use of energy by moving object
If the UE transitions to idle or sleep power states to reduce power consumption, then power efficiency is improved, but latency increases when urgent uplink data needs to be transmitted
Solution Approach 1:
The UE provides feedback to the network node about its buffer status and power state. This feedback mechanism allows the network node to make informed decisions about when to keep the UE in active state versus when to transition to idle or sleep states, optimizing the balance between power efficiency and latency based on actual data conditions
Solution Approach 2:
The system performs preliminary actions by having the UE report buffer status before transitioning to lower power states. This allows the network node to anticipate upcoming data transmission needs and prepare appropriate scheduling decisions, reducing the latency penalty when urgent uplink data arrives
3Productivity
If the UE reports detailed buffer status and traffic flow information, then network scheduling efficiency is improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent extracts only the essential information needed for power state management from the complete buffer status data. Instead of reporting all detailed buffer information, the UE reports specific elements (buffer status, traffic flow identification) that are sufficient for the network node to make power state decisions, reducing signaling overhead while maintaining scheduling efficiency
Solution Approach 2:
The buffer status report mechanism serves multiple functions: it provides information for power state transitions, enables network scheduling decisions, and supports traffic flow management. This multi-functionality reduces the need for separate signaling messages, thereby reducing overall signaling overhead while maintaining network scheduling efficiency
Data Source
AI summary
Apparatuses and methods for on power state transitions are described. An apparatus is configured to receive, from a network node, a DL EOC indication to trigger a status indication. The apparatus is configured to transmit, to the network node and based on the DL EOC indication, the status indication indicative of a status of a buffer or a delay of the UE and an estimated time at which the UE estimates an arrival of a next UL packet. Another apparatus is configured to transmit, to a UE, a DL EOC indication to trigger a status indication. The apparatus is configured to receive, from the UE and based on the DL EOC indication, the status indication indicative of a status of a buffer or a delay of the UE and an estimated time at which the UE estimates an arrival of a next UL packet.