HARQ Buffer Flush for Wireless Carrier Reselection
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Solution Overview
Problem
In wireless communication systems, particularly in LTE-based V2X sidelink communication, carrier reselection can lead to initial transmission and re-transmission of data on different carriers, causing inefficiencies and resource wastage, as existing technologies do not effectively manage the hybrid automatic repeat request (HARQ) buffer during carrier reconfiguration.
Innovation Solution
A method and apparatus for a user equipment (UE) to receive information on multiple resource pools, select a first resource pool, store a MAC PDU in the HARQ buffer, reselect a second resource pool, and flush the HARQ buffer to prevent re-transmission on different carriers, thereby avoiding inefficiencies and resource wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If carrier reselection is performed to improve adaptability and resource utilization, then the system can select optimal carriers for transmission, but initial transmission and re-transmission of the same data may occur on different carriers causing resource wastage and reduced efficiency
Solution Approach 1:
The system performs preliminary actions by flushing the HARQ buffer upon detecting carrier reselection before actual data transmission occurs. This preliminary buffer clearing prevents the problematic scenario where initial transmission and re-transmission occur on different carriers, thereby avoiding resource wastage while maintaining the adaptability benefits of carrier reselection
Solution Approach 2:
The system implements a feedback mechanism where the HARQ buffer status is monitored in relation to carrier reselection events. When carrier reselection is detected, the system provides feedback by triggering a buffer flush operation, creating a closed-loop control that adapts the buffer management strategy to the current carrier configuration state
2Productivity
If carrier reselection is performed to optimize transmission resources, then the system can utilize different carriers for better resource allocation, but re-transmission on different carriers increases loss of time and reduces productivity
Solution Approach 1:
By flushing the HARQ buffer in advance upon carrier reselection detection, the system prevents the time-consuming scenario of re-transmitting data on different carriers. This preliminary action eliminates potential re-transmission delays while maintaining the ability to utilize optimal carriers for transmission
3Reliability
If HARQ buffer is maintained during carrier reselection to preserve transmission continuity, then data can be re-transmitted efficiently, but initial transmission and re-transmission on different carriers cause resource wastage
Solution Approach 1:
The system performs a preliminary buffer flush upon carrier reselection detection, which maintains transmission reliability by ensuring that subsequent transmissions occur on the new carrier without attempting to re-transmit data that was originally intended for the previous carrier, thereby avoiding resource wastage
Data Source
AI summary
A method and apparatus for flushing a hybrid automatic repeat request (HARQ) buffer in a wireless communication system is provided. A user equipment (UE) receives information on multiple resource pools from a network, selects a first resource pool among the multiple resource pools, and stores a media access control (MAC) protocol data unit (PDU) in the HARQ buffer for transmission via the first resource pool. When the UE reselects a second resource pool among the multiple resource pools, the UE flushes the HARQ buffer.