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Mobile messaging technologies and services phần 5

Thay thế đoạn tin nhắn: hoạt động này cho phép thay thế một đoạn tin nhắn trước đó đã gửi (không được giao) bằng một đoạn tin nhắn mới. Xóa tất cả các phân đoạn tin nhắn: xóa tất cả các tin nhắn trước đó đã gửi không được giao. | 162 Mobile Messaging Technologies and Services managed by a dedicated information element the compression control IE. If a compressed stream is too large to fit into one message segment then the compressed stream may be segmented in several parts and each part is conveyed into a single compression control IE. Each compression IE is inserted in a message segment along with other information elements and optional text. If several compression control IEs are used to convey a large compressed stream then only the first compression IE contains the compression control header. Additional compression control IEs only contain raw compression data. The compression control header contains the following information Compression method this field identifies the compression method which has been used to compress extended objects along with optional compression settings. At the time of writing the only compression decompression method supported in extended EMS is based on LZSS compression principles. Compressed bytestream length this is the length of the entire compressed bytestream including the part in the first compression control IE plus part s in additional compression control IEs . This compressed bytestream length is required for the receiving SME to be able to correlate compressed streams with corresponding compression control IEs more than one compressed bytestream may be present in a message . This information is necessary because additional compression control IEs do not refer to a particular compressed stream reference index number. Note that the compression decompression method introduced in extended EMS is not used to compress the text part of the message an SME which does not support the extended EMS compression decompression method is still able to interpret the text part of a message containing one or more compressed bytestreams. The first compression control IE is structured as shown in Table 4.25. If the compressed stream is too large to fit into one message .