MAC-CE Transmission Across HARQ Modes for NTN Reliability
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Solution Overview
Problem
In non-terrestrial networks (NTN), the transmission of medium access control-control elements (MAC-CE) faces challenges in HARQ modes A and B, where incorrect decoding impacts system performance due to limited transmission opportunities or latency, especially for critical MAC-CEs.
Innovation Solution
A terminal device and network device configuration system that allows MAC-CE transmission with a configured number of attempts, ensuring successful decoding by canceling the trigger event upon successful acknowledgment or reaching the configured number, and using a timer for retransmission if acknowledgment is not received within the timer duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MAC-CE is multiplexed in HARQ mode A, then decoding reliability is improved, but transmission opportunity is limited causing latency
Solution Approach 1:
The patent applies dynamics by making the HARQ mode selection flexible rather than fixed. The terminal device can dynamically choose between HARQ mode A and mode B based on the specific MAC-CE type and transmission requirements, allowing the system to adapt transmission opportunities and reliability settings to actual needs rather than being constrained by a fixed mode.
Solution Approach 2:
The patent changes the parameter of HARQ mode selection from a fixed configuration to a configurable parameter that can be adjusted based on MAC-CE characteristics. By allowing selection between different HARQ modes (A for reliability, B for efficiency), the system optimizes the balance between decoding reliability and transmission latency for different scenarios.
2Productivity
If MAC-CE is multiplexed in HARQ mode B, then transmission opportunity is increased, but decoding reliability deteriorates
Solution Approach 1:
The system dynamically adapts the HARQ mode selection based on the specific MAC-CE type and transmission requirements. Rather than being forced into a single mode, the terminal can choose the most appropriate mode (A for critical MAC-CEs requiring reliability, B for non-critical MAC-CEs where transmission opportunity matters more), thereby optimizing the balance between productivity and reliability.
Solution Approach 2:
The patent introduces configurability in the HARQ mode parameter, allowing the system to change between mode A (reliability-oriented) and mode B (efficiency-oriented) based on the specific transmission needs. This parameter change enables the system to maximize transmission opportunities for non-critical MAC-CEs while maintaining reliability for critical ones.
3Reliability
If transmission number is increased, then decoding reliability is improved, but transmission latency increases
Solution Approach 1:
The patent applies dynamics by making the number of transmission attempts configurable rather than fixed. The system can dynamically adjust the transmission number parameter based on the criticality of the MAC-CE and network conditions, allowing fewer attempts for non-critical MAC-CEs (reducing latency) and more attempts for critical ones (improving reliability).
Solution Approach 2:
The patent introduces the transmission number as a configurable parameter that can be adjusted based on MAC-CE characteristics. By changing this parameter dynamically, the system optimizes the trade-off between reliability and latency - using fewer transmission attempts for non-critical MAC-CEs to reduce latency, and more attempts for critical MAC-CEs to ensure reliability.
Data Source
AI summary
Disclosed are devices, methods, apparatuses, and computer readable media for medium access control-control element transmission. An example terminal device may include at least one processor and at least one memory. The at least one memory may include computer program code, and the at least one memory and the computer program code may be configured to, with the at least one processor, cause the terminal device to perform: obtaining, a transmission number configured by a network device for sending an uplink medium access control-control element; and sending, to the network device, the uplink medium access control-control element in a hybrid automatic repeat request process if a number of transmission is less than the configured transmission number, in response to a trigger event for the uplink medium access control-control element.