Communication Device HARQ Gap Detection and Retransmission Control
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Solution Overview
Problem
The introduction of Data versus Paging (DVP) transmission gaps in communication systems, while allowing multiple subscriber identity module usage, negatively impacts communication performance by causing transmission and reception disruptions, leading to suboptimal HARQ performance, false ACK detections, and power stabilization issues.
Innovation Solution
A communication device that determines the presence of transmission gaps before and after scheduled transmission times and adjusts its transmission protocol accordingly, avoiding initial transmissions during gaps, treating potential false ACKs as NACKs, and allowing retransmissions or no transmissions to maintain robust HARQ performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transmission gaps are introduced to support multiple subscriber identity modules, then the mobile terminal can be reached via one network while maintaining communication via another network, but the communication performance deteriorates due to transmission and reception disruptions
Solution Approach 1:
The mobile terminal determines in advance whether a transmission gap is scheduled before a transmission time and adjusts its HARQ operation accordingly. This preliminary detection allows the terminal to proactively avoid futile transmissions and false ACK detections by modifying its transmission behavior based on the anticipated gap, thereby maintaining communication reliability while supporting multi-network operation
Solution Approach 2:
The system implements feedback mechanisms where the mobile terminal reports its transmission status and gap detection information to the network. This feedback loop enables the network to adjust scheduling decisions and HARQ parameters, ensuring that retransmissions are properly coordinated around transmission gaps, thus resolving the conflict between multi-network support and communication reliability
2Productivity
If initial transmissions are performed without considering upcoming transmission gaps, then data transmission can proceed normally, but false ACK detections occur and HARQ performance deteriorates
Solution Approach 1:
The mobile terminal performs preliminary detection of scheduled transmission gaps before initiating any transmission. By determining in advance whether a gap is upcoming, the terminal can prevent initial transmissions that would result in false ACK detections, thereby maintaining both transmission efficiency and HARQ reliability without unnecessary retransmissions
Solution Approach 2:
The system applies preliminary anti-action by suppressing transmissions that would otherwise occur before transmission gaps. This preventive measure counteracts the potential harm of false ACK detections and futile retransmissions, ensuring that HARQ operations are aligned with the actual transmission schedule while maintaining productivity
3Productivity
If retransmissions are performed during transmission gaps, then continuous data flow is maintained, but power control becomes unstable and communication reliability decreases
Solution Approach 1:
The invention extracts retransmissions from the transmission gap period by scheduling them before or after the gap instead of during it. This separation ensures that power control can stabilize during non-gap periods while maintaining data flow continuity through proper timing of retransmissions, thus resolving the conflict between productivity and power control stability
Data Source
AI summary
A communication device is described comprising a transmitter configured to transmit data according to a retransmission protocol, a determiner configured to determine whether, for a transmission time scheduled according to the retransmission protocol, there was a transmission gap within a predetermined time interval before the transmission time or to determine whether there will be a transmission gap within a predetermined time interval after the transmission time and a controller configured to control the transmitter to perform an initial transmission of data or a retransmission of data according to the retransmission protocol at the transmission time based on the result of the determination.