Polar-Coded Data Transmission for High-Latency Satellite Links
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Solution Overview
Problem
The integration of satellite communication with terrestrial communication in 5G networks faces challenges due to increased latency and reduced communication efficiency caused by the use of existing HARQ mechanisms, particularly in satellite communication systems with long transmission distances and high latency.
Innovation Solution
A data transmission method that adaptively selects a target data transmission mode, utilizing polar codes to combine encoded-bit combinations based on channel reliability and distance, ensuring efficient and reliable communication by optimizing the encoding process for both terrestrial and satellite base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the HARQ mechanism in LTE is used for satellite communication, then communication reliability is improved, but latency is greatly increased and communication efficiency is severely affected
Solution Approach 1:
The patent applies dynamics by making the transmission mechanism adaptable to different communication scenarios. The system dynamically selects between different transmission modes (HARQ-based retransmission for terrestrial communication, and single-transmission modes for satellite communication) based on the communication type, thereby optimizing both reliability and latency for each scenario rather than using a fixed mechanism
Solution Approach 2:
The patent changes the transmission parameters based on the communication scenario. For satellite communication, it modifies the transmission mechanism by disabling retransmission and adjusting the encoding scheme (using polar codes with specific parameters), which reduces latency while maintaining adequate reliability for the high-latency satellite channel
2Reliability
If satellite communication is integrated with terrestrial communication, then coverage and reliability are enhanced, but the complexity of the terminal device increases
Solution Approach 1:
The patent applies universality by designing a terminal device that can handle both terrestrial and satellite communication through a unified architecture. The terminal uses the same physical layer processing and higher layer protocols for both communication types, with the network side determining the appropriate transmission mode, thereby avoiding the need for separate dedicated satellite communication hardware and reducing overall complexity
Solution Approach 2:
The patent introduces the network side (base station/gateway) as an intermediary that manages the complexity of handling both terrestrial and satellite communications. The network side determines the communication type and selects the appropriate transmission mechanism, shielding the terminal from the complexity of managing multiple communication protocols and modes
3Productivity
If more data transmission resources are provided for 5G communication, then network rate is improved, but communication efficiency may be affected by increased latency in satellite links
Solution Approach 1:
The patent changes the transmission parameters specifically for satellite communication to optimize the trade-off between network rate and latency. It uses polar codes with carefully selected parameters (code length, code rate) and disables retransmission, which allows efficient use of available bandwidth while accepting the inherent latency of satellite links without compounding it through retransmission protocols
Data Source
AI summary
A data transmission method and a communications device, the method including: determining, by a first communications device, a target data transmission mode, where the target data transmission mode is used to indicate a quantity of times that the first communications device transmits an encoded-bit combination to a second communications device and an encoded-bit combination transmitted each time, the encoded-bit combination transmitted each time may include one encoded bit sequence or a plurality of encoded bit sequences, where the encoded bit sequence is obtained by encoding all or some of K information bits, and K is a positive integer, and sending, by the first communications device, the encoded-bit combination to the second communications device in the target data transmission mode, and receiving, by the second communications device, the encoded-bit combination sent by the first communications device, and decoding the encoded bit sequence included in the encoded-bit combination.