Carrier-Aggregated Fountain Coding for Low-Latency RLC Decoding
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Solution Overview
Problem
In wireless communication systems, the latency increases when a base station requests a retransmission of radio link control (RLC) protocol data units (PDUs) due to interference, as the time between transmitting the original and successfully decoding the retransmitted RLC PDU is longer than the original decoding time, leading to inefficiencies in data transmission.
Innovation Solution
Implementing a method where data units are divided into blocks, encoded using a fountain code, and transmitted over multiple carriers, allowing successful decoding without the need for retransmissions by ensuring enough RLC PDUs are received across carriers, thus reducing latency and overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retransmission is requested when base station fails to decode RLC PDU, then decoding reliability is improved, but transmission latency increases
Solution Approach 1:
The patent applies preliminary action by performing fountain code encoding in advance to generate multiple encoded RLC PDUs from the original data blocks. These pre-encoded PDUs are then transmitted across multiple carriers, allowing the base station to decode data successfully without needing to request retransmissions, thereby reducing latency while maintaining reliability.
Solution Approach 2:
The patent introduces fountain code encoding as an intermediary mechanism between the original data and the transmitted RLC PDUs. This intermediary process creates multiple encoded versions of the data that can be independently decoded, serving as a mediator that eliminates the need for retransmission requests and reduces overall transmission time.
2Reliability
If retransmission is requested when base station fails to decode RLC PDU, then data integrity is improved, but transmission overhead increases
Solution Approach 1:
The patent performs fountain code encoding in advance to generate multiple encoded RLC PDUs that can be transmitted simultaneously across different carriers. This preliminary encoding eliminates the need for subsequent retransmission overhead, as the base station can successfully decode data from the initial transmission set, thereby reducing overall transmission overhead while maintaining data integrity.
3Reliability
If multiple carriers are used for transmission, then transmission reliability is improved, but system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the encoded RLC PDUs into different subsets that are transmitted across multiple carriers. Each carrier carries a portion of the encoded data, and the base station combines information from multiple carriers to successfully decode the original data. This segmentation approach improves transmission reliability by distributing data across multiple channels while managing system complexity through structured division.
Solution Approach 2:
The patent employs fountain code encoding that generates universal encoded RLC PDUs that can be transmitted across any carrier and decoded using the same decoding process. This multi-functionality allows the system to use multiple carriers for improved reliability without requiring different decoding mechanisms for each carrier, thereby managing system complexity while enhancing transmission reliability.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. An encoding device (e.g., a user equipment (UE) or a base station) may divide one or more data units (e.g., packet data convergence protocol (PDCP) protocol data units (PDU)) into a set of data blocks. The encoding device may encode the set of data blocks using a fountain code and may generate a set of data units (e.g., radio link control (RLC) PDUs) based on encoding the set of data blocks using the fountain code. The UE may allocate a first subset of the set of data units to a first carrier and a second subset of the set of data units to a second carrier and may transmit the first subset over the first carrier and the second subset over the second carrier.