HARQ Process Swapping in Wireless Infrastructure Equipment
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Solution Overview
Problem
Current wireless telecommunications systems face inefficiencies in HD-FDD networks due to unnecessary retransmissions in HARQ-ACK bundling, where the base station cannot determine which data channels have failed, leading to the entire bundle being retransmitted, and there is a lack of precision in acknowledging received data channels, affecting throughput and resource utilization.
Innovation Solution
Implementing a system with controller circuitry that divides data channels into bundles and swaps HARQ processes between retransmitted bundles, allowing the base station to estimate which data channels have failed, thereby reducing retransmission inefficiency and improving throughput by enabling more precise acknowledgement and retransmission of only necessary data channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If HARQ-ACK bundling is used in HD-FDD networks, then the complexity of acknowledging multiple data channels is reduced, but the precision of identifying failed data channels deteriorates, causing unnecessary retransmissions
Solution Approach 1:
The patent segments the bundled data channels into individual HARQ processes, allowing separate tracking and acknowledgment of each data channel within the bundle. This enables the base station to identify which specific data channels failed without having to retransmit the entire bundle, thus resolving the contradiction between reduced complexity and maintained precision.
2Reliability
If the entire bundle is retransmitted when any data channel fails, then the reliability of data delivery is improved, but the resource utilization deteriorates due to unnecessary retransmissions
Solution Approach 1:
The patent implements enhanced feedback mechanisms where the base station receives individual ACK/NACK signals for each HARQ process within the bundle. This detailed feedback enables selective retransmission of only the failed data channels, improving resource utilization while maintaining delivery reliability through targeted retransmissions based on actual failure conditions.
3Productivity
If HARQ processes are swapped between retransmitted bundles, then the throughput is improved by reducing unnecessary retransmissions, but the system complexity increases
Solution Approach 1:
The patent introduces dynamic HARQ process swapping between retransmitted bundles, where the system adaptively exchanges HARQ process identifiers based on feedback information. This dynamic approach allows the system to optimize throughput by reusing successfully transmitted HARQ processes while managing the increased complexity through structured process identification and swapping mechanisms.
Data Source
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AI summary
The present disclosure relates to an infrastructure equipment forming part of a wireless telecommunications system. The infrastructure equipment comprises transmitter circuitry for transmitting signals representing data via a wireless access interface of the wireless telecommunications system to a communications device, receiver circuitry for receiving signals representing data via the wireless access interface from the communications device, and controller circuitry configured to control the transmitter circuitry and the receiver circuitry to transmit and receive signals via the wireless access interface in accordance with a time divided structure in which the wireless access interface is divided into a plurality of repeating time units. The controller circuitry is configured in combination with the transmitter circuitry and receiver circuitry to transmit, in a first repetition of the time units, a plurality of control channels configured to schedule a plurality of data channels configured to carry data, the data channels being divided into a plurality of bundles each comprising a plurality of the data channels, to transmit, in the first repetition of the time units, one or more of the plurality of bundles, and to re-transmit the data, in a second repetition of the time units, for at least a first of the bundles and a second of the bundles, one or more of the data channels of the first of the bundles being swapped for re-transmission with one or more of the data channels of the second of the bundles. In some embodiments of the present disclosure, the controller circuitry is configured to control the receiver circuitry to receive from the communications device a negative acknowledgement for each of one or more of the bundles indicating that one or more of the data channels of each of the plurality of bundles for which the negative acknowledgement was received has not been successfully received by the communications device, wherein the bundles for which the negative acknowledgements were received comprises the first bundle and the second bundle. Embodiments of the present invention provide systems and methods to reduce the retransmission inefficiency of HARQ-ACK bundling.