Bandwidth Part Switching via Inactivity Timer for Retransmission
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Solution Overview
Problem
Current wireless data transmission systems face challenges in efficiently managing bandwidth parts (BWP) during re-transmissions, particularly in coordinating failure and recovery scenarios between different vendors' Central Unit (CU) and Distributed Unit (DU) in radio access networks, leading to inconsistent states and potential call failures.
Innovation Solution
The implementation of a method that allows user apparatuses to detect the need for re-transmissions on allocated bandwidth parts and reset a timer to automatically switch to a default BWP, thereby ensuring continuous data transmission without incurring additional energy consumption or network signaling, while accommodating various retransmission types and BWP sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic BWP switching is implemented during re-transmissions, then reliability of data transmission is improved, but device complexity increases due to timer management and state coordination
Solution Approach 1:
The system pre-configures default BWPs and inactivity timers before data transmission begins. When the timer expires, the system automatically switches to the default BWP, preventing inconsistent states between CU and DU without requiring complex real-time negotiation protocols.
Solution Approach 2:
The inactivity timer mechanism provides continuous feedback about the transmission state. When the timer expires, it triggers automatic BWP switching, creating a closed-loop control system that maintains reliability without requiring complex external coordination.
2Adaptability or versatility
If multiple BWPs are allocated for different transmission scenarios, then adaptability is improved, but loss of energy increases due to maintaining multiple active bandwidth parts
Solution Approach 1:
The system dynamically switches between multiple BWPs based on transmission needs. The inactivity timer controls transitions from active BWPs to default BWP, allowing the system to maintain adaptability for different transmission scenarios while reducing energy consumption by deactivating unnecessary bandwidth parts when not in use.
Data Source
AI summary
A method includes: detecting a need for a retransmission of a data transmission on one or more bandwidth parts (BWP) between a user apparatus and a radio access network; and in response to detecting the need for the retransmission, resetting a timer, wherein an expiration of the timer causes automatic switching from using the one or more BWPs for the data transmission to using a default BWP for the data transmission.