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Mobile Communication

Mobile Communication. Extented-EMS. E-EMS. Mobile Communication. Extended Object Framework. Within this framework, a large object is segmented into several parts and each part is included in the payload of a dedicated IE.

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Mobile Communication

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  1. Mobile Communication Extented-EMS

  2. E-EMS Mobile Communication Extended Object Framework. Within this framework, a large object is segmented into several parts and each part is included in the payload of a dedicated IE. Each IE known as “Extended Object”, is conveyed in one message segment with other IE.

  3. E-EMS Mobile Communication Extended Object Framework. The first part of the picture is encoded in the first extended object IE. For a concatenated message the maximum length of the picture segment in the first extended object is 124 octets In addition to containing the first picture segment, this first IE extended object also contains the “extended header”

  4. Mobile Communication Extended Object Framework. The “extended header” is composed of the following: Object Length: These octets represent the length of the object, expressed Octets. This length comprises the part of the object Which is included in the first extended object IE Object handling Status: This octet indicates how the object should be handled By the receiving SME

  5. Mobile Communication Extended Object Framework. The “extended header” is composed of the following: Object Type: This octet indicates which type of object is being Conveyed as part of a IE. Object Position: Because an extended object can be segmented over several messages segments, this object position indicates the absolute message text position where the object should be placed <compared to basic EMS only specific positions>

  6. E-EMS Mobile Communication Compression of Extended Objects. Extended objects can be significantly larger than objects supported in basic EMS. In order to avoid explosion of message segments between SME’s a support of compression/decompression has been introduced in Extended EMS

  7. E-EMS Mobile Communication Compression of Extended Objects. Compression is managed by a dedicated IE. 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 each part is conveyed into a single compression control IE. Further each compression IE is inserted in a message segment along with other IE’s. Likewise if a number of compression IE are used only the first contains the “compression control header”

  8. E-EMS Mobile Communication • Compression of Extended Objects. • The “compression control header” contains the following. • 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

  9. E-EMS Mobile Communication • Compression of Extended Objects. • The “compression control header” contains the following. • Compression byte stream length: • This is the length of the entire compressed bytestream. This compressed bytestream length is required for the receiving SME to be able to correlate compressed streams with corresponding compression control IE’s, this information is necessary because additional compression control IE’s do not refer to a particular compressed stream

  10. E-EMS Mobile Communication

  11. E-EMS Mobile Communication

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