DRX Retransmission Timer Control for HARQ-Off NTN Terminals
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Solution Overview
Problem
In Non-Terrestrial Networks (NTN), the increased signal transmission latency between terminals and satellites in satellite communication systems complicates the management of Discontinuous Reception (DRX) retransmission timers for HARQ processes, especially when the HARQ feedback function is off, leading to unclear conditions for starting these timers.
Innovation Solution
A method and apparatus for flexibly enabling or disabling DRX retransmission timers based on indication information, allowing terminals to determine whether to start these timers for HARQ processes with HARQ functions off, thereby optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the DRX retransmission timer is always started for HARQ processes with HARQ function off, then retransmission reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the DRX retransmission timer configurable and controllable. The network device can dynamically adjust whether the timer is started based on service requirements, and the terminal can flexibly enable or disable the timer according to received indication information. This transforms a static timer behavior into a dynamic, adaptive mechanism that responds to changing conditions.
Solution Approach 2:
The patent changes the parameter state of the DRX retransmission timer from a fixed default state to a configurable state. By introducing indication information that can modify the timer's enabled/disabled state, the system allows parameter changes based on service types and network conditions, optimizing the balance between reliability and power consumption.
2Use of energy by moving object
If the DRX retransmission timer is never started for HARQ processes with HARQ function off, then power consumption is reduced, but retransmission reliability deteriorates
Solution Approach 1:
The patent enables parameter changes by allowing the DRX retransmission timer's state to be modified through indication information. The terminal can switch the timer between enabled and disabled states based on service requirements, achieving parameter optimization that balances power savings with reliability needs.
Solution Approach 2:
The patent introduces dynamic control over the DRX retransmission timer behavior. Instead of a fixed never-started state, the timer becomes dynamically controllable through network indication, allowing the system to adapt to different service scenarios and maintain reliability when needed while saving power when not needed.
3Adaptability or versatility
If flexible indication information is introduced to control DRX retransmission timer, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the control decision logic from the terminal and places it in the network device. The network device determines whether the DRX retransmission timer should be started and conveys this decision through indication information. This extraction simplifies the terminal's complexity while maintaining overall system adaptability.
Solution Approach 2:
The patent uses indication information as an intermediary to transmit the control decision from the network device to the terminal. This intermediary mechanism allows flexible control without requiring complex processing at the terminal, as the indication information simply carries the pre-determined control state.
Data Source
AI summary
Provided are methods and apparatuses for starting a discontinuous reception (DRX) retransmission timer, and devices and a medium, and relates to the technical field of communications. The method includes: receiving indication information; and determining whether to start a DRX retransmission timer corresponding to a hybrid automatic repeat request (HARQ) process based on the indication information. For the HARQ process with a HARQ function off, the terminal may flexibly start a DRX retransmission timer corresponding to a HARQ for transmitting data based on the indication information. When the DRX retransmission timer is not started, power can be saved for the terminal.