Network-Coded Configured Grant Uplink HARQ for Adaptive Retransmissions
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Solution Overview
Problem
Existing communication systems face inefficiencies in managing hybrid automatic repeat request (HARQ) operations, particularly in configured grant uplink scenarios, which can lead to suboptimal data transmission and reception due to lack of effective network coding techniques.
Innovation Solution
Implementing configured grant uplink HARQ operation with network coding, where wireless transmit/receive units transmit network coded protocol data units (NC-PDUs) and provide associated feedback information to assist the network in decoding, allowing for adaptive retransmissions based on acknowledgment feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional HARQ operations are used in configured grant uplink scenarios, then the system maintains simple operation and structure, but data transmission efficiency is suboptimal due to lack of effective network coding techniques
Solution Approach 1:
The patent changes the fundamental parameter of data representation by introducing network coding, where data packets are transformed into coded packets through mathematical operations. This allows the receiver to reconstruct original data from any sufficient subset of transmitted coded packets, thereby improving transmission efficiency without proportionally increasing system complexity
Solution Approach 2:
The patent introduces an intermediary network coding layer between the application layer and the physical transmission layer. This intermediary performs encoding operations on data packets before transmission and enables efficient decoding at the receiver, resolving the contradiction by adding functional complexity only where needed for efficiency improvement
2Reliability
If network coding is implemented to improve decoding capabilities, then data transmission efficiency is enhanced, but the complexity of managing NC-PDUs and feedback information increases
Solution Approach 1:
The patent segments the network coding process into distinct manageable components: NC-PDU generation, transmission occasion management, feedback information handling, and decoding operations. This segmentation allows each component to be optimized independently, improving decoding capability while controlling overall system complexity through modular design
Solution Approach 2:
The patent implements a feedback mechanism where the receiver sends acknowledgment information about successfully decoded NC-PDUs back to the transmitter. This feedback enables the transmitter to adaptively manage subsequent transmissions, improving reliability by ensuring successful decoding while reducing unnecessary retransmissions that would increase complexity
3Reliability
If redundant retransmissions are performed to ensure data delivery, then reliability is maintained, but resource utilization is suboptimal
Solution Approach 1:
The patent changes the parameter of data representation to coded packets, where each NC-PDU contains encoded information from multiple original packets. This allows the receiver to reconstruct original data from any sufficient subset of transmitted packets, eliminating the need for redundant retransmissions of identical data and thereby improving resource utilization while maintaining delivery reliability
Solution Approach 2:
The patent transmits more coded packets than the minimum number of original packets, where each coded packet contains partial encoded information. The receiver only needs to successfully receive a sufficient subset of these coded packets to reconstruct all original data, achieving reliable delivery without the waste of complete redundant retransmissions
Data Source
AI summary
A method, implemented in a wireless transmit receive unit (WTRU) is described. The method may include transmitting a set of network coded protocol data units (NC-PDUs) of a network coding (NC) generation in one or more transmit occasions of a configured grant (CG) period. The method may include transmitting NC related information associated with the NC generation to assist a network in decoding. In various embodiments, the NC related information may indicate a number of NC-PDUs of the NC generation to be transmitted in the one or more transmit occasions of the CG period. The method may include monitoring to receive feedback information from the network for the NC generation and transmitting one or more subsequent sets of NC-PDUs from the NC generation in one or more subsequent CG periods until the feedback information acknowledging a reception of the NC generation may be received from the network.