HARQ Retransmission Offset Handling During Component Carrier Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems like 5G NR, hybrid automatic repeat request (HARQ) retransmissions can be complicated by component carrier (CC) switching, where different numerologies between CCs can lead to misalignment in slot formats, causing challenges in processing HARQ retransmission requests.
Innovation Solution
Mechanisms are introduced to handle CC switching during HARQ retransmissions by determining and coordinating the numerology used by the UE and base station, allowing accurate interpretation of HARQ retransmission offset values, thereby enabling proper retransmission handling and resource conservation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If component carrier switching is implemented to improve communication flexibility and resource utilization, then adaptability and resource efficiency are improved, but slot format misalignment occurs between different numerologies, causing HARQ retransmission processing complexity to increase
Solution Approach 1:
The base station determines the numerology for the retransmission slot before the HARQ retransmission occurs. By preliminarily establishing the numerology configuration based on the component carrier switching timing and the slot where the retransmission will occur, the system avoids slot format misalignment and simplifies the HARQ retransmission processing between UE and base station
2Productivity
If component carrier switching with different numerologies is used to optimize resource allocation, then resource utilization is improved, but slot format misalignment causes communication reliability to deteriorate
Solution Approach 1:
The base station preliminarily determines the numerology to be used in the retransmission slot by considering the component carrier switching timing and the specific slot where retransmission occurs. This advance determination ensures that both UE and base station use consistent numerology configurations, preventing slot format misalignment and maintaining communication reliability while allowing flexible resource allocation across different component carriers
Data Source
AI summary
Aspects described herein relate to receiving, from a base station, a hybrid automatic repeat request (HARQ) retransmission request including a HARQ retransmission offset value indicating a slot of an uplink transmission to be retransmitted, and transmitting, to the base station based on the HARQ retransmission offset value, a retransmission of the uplink transmission in the slot.