Data Reordering for Discontinuous Transmission Gaps
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Solution Overview
Problem
In mobile communication systems like UMTS, synchronization issues between data transmission and transmission gaps can lead to inefficient retransmissions due to coinciding gaps, resulting in fruitless retransmissions and incomplete data delivery.
Innovation Solution
A data reordering scheme is implemented where data blocks are reordered before retransmission to avoid coinciding with transmission gaps, using methods such as pseudorandom reordering, ensuring that data portions initially interrupted by gaps are transmitted outside of these gaps during retransmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data transmission is performed using HARQ processes in parallel, then data delivery capability is improved, but transmission efficiency deteriorates when transmission gaps coincide with data blocks causing fruitless retransmissions
Solution Approach 1:
The patent applies dynamics by making the data block transmission pattern adaptable rather than fixed. The system dynamically adjusts which data blocks are transmitted in which time periods based on the timing of transmission gaps. This allows the HARQ process to adapt to varying gap patterns and avoid fruitless retransmissions while maintaining reliable data delivery capability.
Solution Approach 2:
The patent applies preliminary action by determining the timing of transmission gaps before scheduling data block transmissions. The system proactively identifies gap periods and uses this information to plan data block transmissions that avoid these gaps, preventing fruitless retransmissions before they occur rather than reacting after the problem arises.
2Adaptability or versatility
If transmission gaps are introduced for mobile terminal measurements, then measurement capability is improved, but data transmission completeness deteriorates when gaps continuously interrupt the same HARQ process
Solution Approach 1:
The patent applies segmentation by dividing the data transmission into multiple data blocks that can be scheduled in different time periods. Instead of transmitting all data in a single continuous stream that could be interrupted by gaps, the system segments data into blocks that can be strategically placed to avoid gap periods, ensuring measurement capability is maintained while data transmission completeness is preserved.
Solution Approach 2:
The patent applies dynamics by making the data block transmission pattern adaptable rather than fixed. The system dynamically adjusts which data blocks are transmitted in which time periods based on the timing of transmission gaps. This allows the HARQ process to adapt to varying gap patterns and avoid fruitless retransmissions while maintaining reliable data delivery capability.
3Device complexity
If synchronous HARQ process is used, then protocol simplicity is improved, but transmission efficiency deteriorates when HARQ period coincides with transmission gap period causing continuous interruptions
Solution Approach 1:
The patent applies preliminary action by determining the timing of transmission gaps before scheduling data block transmissions. The system proactively identifies gap periods and uses this information to plan data block transmissions that avoid these gaps, preventing fruitless retransmissions before they occur rather than reacting after the problem arises.
Solution Approach 2:
The patent applies dynamics by making the data block transmission pattern adaptable rather than fixed. The system dynamically adjusts which data blocks are transmitted in which time periods based on the timing of transmission gaps. This allows the HARQ process to adapt to varying gap patterns and avoid fruitless retransmissions while maintaining reliable data delivery capability.
Data Source
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AI summary
A communication system employs discontinuous transmission to create gaps in transmission during which a transmitting device (200) can receive. When the transmission of a data block coincides with a transmission gap such that a portion of the data block is not transmitted, the block is retransmitted later. Prior to the retransmission, the data in the data block is reordered. The reordering may be predetermined, or may be selected to ensure that the same portion of data does not coincide with a transmission gap in the retransmission.