Meanwhile the paper analyzes the deficiency of current transmission coding and describes a new data transformation method, base91 coding with high encoding efficiency but low data extension.
论文同时分析了现有的电子邮件系统传输编码存在的缺陷，提出了一种利用编码效率高、数据扩展率低的数字数据变换方法：基数- 91编码来提高编码效率。
The user plane is mainly responsible for the access, transformation (such as codec), and transmission of the user traffic data.
用户平面则主要负责用户数据流的接入、格式转换和转发等。
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