Cell ON-OFF Patterns With Short DRX Cycles for URLLC QoS
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Solution Overview
Problem
In 5G New Radio (NR) networks, long discontinuous transmission (DTX) cycles at network cells fail to meet the quality of service (QoS) requirements of high-priority traffic due to extended sleep modes, particularly for ultra-reliable low latency communications (URLLC).
Innovation Solution
Implementing short DTX/DRX cycles within the OFF duration of long DTX/DRX cycles to allow uplink and downlink transmissions for high-priority traffic, configured and activated based on priority and delay requirements, using system information blocks (SIB), radio resource control (RRC) signaling, and group common DCI/MAC-CE messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a long OFF duration is used in cell DRX/DTX cycle to conserve power, then energy efficiency is improved, but quality of service for high priority traffic deteriorates
Solution Approach 1:
The long OFF duration is segmented by inserting short ON durations at specific intervals. These short ON durations divide the continuous sleep period into manageable segments, allowing periodic communication opportunities for high priority traffic while maintaining the overall long cycle structure for power savings.
Solution Approach 2:
Short ON durations are inserted periodically within the long OFF duration at configured intervals. This periodic activation allows the cell to maintain sleep mode for power savings while providing regular communication windows for time-sensitive high priority traffic such as URLLC.
2Reliability
If short ON durations are inserted during OFF duration to support high priority traffic, then quality of service is improved, but power consumption increases
Solution Approach 1:
Different quality levels are applied to different time periods within the DRX/DTX cycle. During short ON durations, the cell provides high-quality service with full transmission capability for high priority traffic. During the remaining long OFF duration, the cell operates in low-power mode, accepting reduced service quality for non-critical traffic.
Solution Approach 2:
Instead of maintaining full transmission capability continuously, the cell applies partial action by activating transmission only during short ON durations. This partial activation is sufficient to meet the requirements of high priority traffic while avoiding the excessive power consumption of continuous operation.
3Adaptability or versatility
If multiple ON-OFF patterns are configured and activated dynamically, then adaptability to different traffic requirements is improved, but device complexity increases
Solution Approach 1:
The system transitions from static single-pattern DRX/DTX configuration to dynamic multi-pattern configuration. Multiple ON-OFF patterns are pre-configured with different characteristics, and the network can dynamically activate appropriate patterns based on current traffic conditions, particularly activating patterns with short ON durations when high priority traffic is detected.
Solution Approach 2:
Multiple ON-OFF patterns are pre-configured in advance with different parameters optimized for different traffic types. This preliminary preparation allows the network to quickly switch between patterns without complex real-time calculations, reducing the operational complexity while maintaining high adaptability.
Data Source
AI summary
A user equipment (UE) configured to decode, from signaling received from a serving cell, a configuration for a first cell ON-OFF pattern and a second cell ON-OFF pattern for the serving cell, wherein the second cell ON-OFF pattern comprises at least one ON duration during an OFF duration of the first cell ON-OFF pattern, decode, from signaling received from the serving cell, an activation for one or more ON durations of the second cell ON-OFF pattern and configure transceiver circuitry to perform an uplink (UL) transmission for cell reception or a downlink (DL) reception for cell transmission during the activated one or more ON durations of the second cell ON-OFF pattern, wherein the UL transmission or DL reception is performed only for traffic with an associated priority or delay requirement meeting a corresponding threshold or for random access (RACH) traffic.