HARQ Group-Common Transmission Power Management
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently performing initial transmission and retransmission while minimizing terminal power consumption, particularly in HARQ-based transmission and reception for group common transmission, which affects energy efficiency and latency.
Innovation Solution
A method and device for HARQ-based transmission and reception in wireless communication systems that involve receiving group common data, transmitting ACK/NACK information, and performing retransmissions based on round trip times and new data indicators, optimizing terminal-specific and group common transmissions to reduce power consumption and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-based retransmission is performed for group common transmission, then transmission reliability is improved, but terminal power consumption increases due to continuous monitoring and processing
Solution Approach 1:
The terminal determines in advance whether to expect retransmission by checking if the first transmission is terminal-specific transmission associated with the same HARQ process and if the NDI value is not toggled. This preliminary determination allows the terminal to enter sleep mode when no retransmission is expected, reducing power consumption while maintaining reliability when retransmission is needed
Solution Approach 2:
The terminal monitors for retransmission periodically based on the round trip time (RTT) after transmitting HARQ ACK/NACK information. Instead of continuous monitoring, the terminal only wakes up at specific intervals to check for retransmission, significantly reducing power consumption while ensuring reliable reception when retransmission occurs
2Reliability
If the terminal continuously monitors for retransmission, then transmission reliability is improved, but latency increases due to extended active time
Solution Approach 1:
By determining in advance whether retransmission will occur based on the NDI value and HARQ process association, the terminal can avoid unnecessary active monitoring periods. This reduces the time the terminal spends in active state, thereby reducing latency while maintaining reliability through targeted monitoring only when needed
Solution Approach 2:
The terminal dynamically adjusts its monitoring behavior based on the characteristics of the first transmission. When the first transmission is terminal-specific with non-toggled NDI, the terminal activates monitoring for retransmission; otherwise, it enters sleep mode. This dynamic adaptation optimizes both reliability and latency by matching monitoring activity to actual transmission needs
Data Source
AI summary
A method performed by a terminal in a wireless communication system according to an embodiment of the present disclosure comprises the steps of: receiving a group-common transmission regarding a TB from a network; transmitting hybrid automatic repeat request (HARQ) acknowledgement (ACK) or non-acknowledgement (NACK) information regarding the group-common transmission to the network, on the basis of whether the TB is successfully decoded; and receiving first transmission from the network after a first round trip time (RTT) has lapsed since transmission of the HARQ ACK/NACK information regarding the group-common transmission. The first transmission corresponds to group-common transmission or terminal-specific transmission. The first transmission may correspond to retransmission of the TB on the basis that the first transmission is terminal-specific transmission associated with the same HARQ process as the group-common transmission, and that a new data indicator (NDI) value is not toggled.