HARQ Process ID Determination for Discontinuous Transmission in 5G
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Solution Overview
Problem
In extended reality (XR) services over 5G mobile communication systems, excessive battery consumption and control channel usage occur due to frequent data transfers, necessitating a reduction in battery consumption and control channel usage to sustain XR services efficiently.
Innovation Solution
The method enhances discontinuous transmission (DTX) operations by determining HARQ process ID based on specific modes (HARQ_PID_Determination_mode_1 or HARQ_PID_Determination_mode_2) within RRC messages, optimizing uplink transmission periods to minimize power consumption while maintaining network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequent data transfer is performed to provide XR services, then service quality is improved, but battery consumption increases
Solution Approach 1:
The patent implements discontinuous transmission (DTX) where uplink transmissions are performed periodically rather than continuously. The terminal determines specific transmission periods based on HARQ process ID and transmission period parameters, enabling periodic data transfer that maintains XR service quality while reducing overall battery consumption by keeping the transmitter idle during non-transmission periods.
Solution Approach 2:
The patent dynamically adjusts transmission parameters including HARQ process ID selection and transmission period timing based on network conditions and service requirements. The terminal can adaptively determine when to transmit uplink data within configured grant opportunities, allowing flexible optimization between service quality and power consumption rather than following a fixed transmission schedule.
2Productivity
If frequent data transfer is performed to provide XR services, then service quality is improved, but control channel usage increases
Solution Approach 1:
By implementing periodic uplink transmissions instead of continuous transmission, the patent reduces the frequency of control channel interactions. The terminal only accesses control channels during configured grant transmission periods to send uplink data, thereby reducing overall control channel usage while maintaining adequate service quality through periodic updates.
3Use of energy by moving object
If discontinuous transmission is implemented to reduce power consumption, then battery consumption is reduced, but transmission reliability may deteriorate
Solution Approach 1:
The patent incorporates HARQ (Hybrid Automatic Repeat Request) mechanisms where the terminal determines HARQ process ID for each transmission. The network provides feedback on transmission success, and the terminal can retransmit failed data packets using configured grant resources. This feedback loop ensures transmission reliability is maintained even with discontinuous transmission patterns, as failed transmissions are automatically recovered through retransmission.
Data Source
AI summary
A method and apparatus for enhanced discontinuous transmission is provided. Method for discontinuous transmission includes receiving a RRC message from the base station and performing uplink transmission for configured grants during a first transmission period based on presence of a first information in the RRC message. The RRC message includes one or more configured grant parameters. To perform uplink transmission for configured grants, HARQ process ID is determined based on HARQ_PID_Determination_mode_1 if a second information is absent in the configured grant configuration and based on HARQ_PID_Determination_mode_2 if a second information is present in the configured grant configuration.