Network Coded Sidelink Data Transmission
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in sidelink data transmission, particularly when a UE fails to decode data packets, as individually retransmitting decoded packets can decrease system efficiency and throughput.
Innovation Solution
Implementing network coding by configuring UEs with network coding parameters to generate and transmit network coded packets, allowing successful decoders to relay missing data packets to non-decoders, thereby enhancing system efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individually retransmitting decoded packets to each UE that failed to decode, then data delivery reliability is improved, but system efficiency and throughput deteriorate
Solution Approach 1:
The patent merges multiple individual retransmission operations into a single network-coded transmission. UEs that successfully decoded the original transmission combine their decoded packets using network coding algorithms (e.g., XOR operations) to generate coded packets, which are then transmitted to UEs that failed to decode. This combining approach reduces the total number of transmissions required, improving system throughput while maintaining data delivery reliability.
Solution Approach 2:
The patent introduces successful decoders as intermediary nodes that facilitate data recovery for unsuccessful decoders. Instead of direct base station to UE retransmissions, the successfully decoded UEs act as intermediaries that generate and transmit coded packets to those that failed to decode, enabling efficient peer-to-peer assistance within the network.
2Productivity
If implementing network coding with peer-to-peer retransmissions, then system throughput is improved, but device complexity increases
Solution Approach 1:
The patent changes the operational parameters of UEs by configuring them with network coding algorithms and parameters through base station control. The base station provides configuration messages that specify coding schemes, packet combination rules, and transmission protocols, allowing UEs to perform network coding operations without requiring complex autonomous decision-making, thus managing device complexity through centralized parameter management.
Solution Approach 2:
The patent enables UEs to self-organize into encoder and decoder roles based on their decoding success, eliminating the need for continuous base station scheduling of each retransmission. Successfully decoded UEs automatically generate coded packets and identify recipients based on feedback information, providing self-service functionality that reduces control signaling overhead and simplifies overall system management.
3Productivity
If using network coded transmissions instead of individual retransmissions, then number of transmissions is reduced, but feedback requirements increase
Solution Approach 1:
The patent segments the feedback requirement into two parts: initial feedback from all UEs indicating decoding success or failure, and subsequent feedback from unsuccessful decoders confirming receipt of coded packets. This segmentation allows the system to efficiently manage feedback flow, where the initial segment enables identification of encoding targets, and the second segment confirms successful data recovery, reducing overall feedback overhead compared to traditional individual retransmission protocols.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A base station and user equipment (UE) may support network coded communications on a sidelink connection. The base station may configure UEs with network coding configurations. The network coding configuration may include one or more sets of network coding parameters. The base station may configure a first UE to send network coded information on the sidelink to a second UE. The network coded information may be generated based on data packets which were unsuccessfully decoded by the second UE. By transmitting network coded information on a sidelink, the second UE may efficiently obtain data packets which were unsuccessfully decoded from the base station.