. Nếu một vài nén kiểm soát IE được sử dụng để truyền tải một dòng suối nén lớn, sau đó chỉ ï ¬ rst nén IE có chứa các tiêu đề kiểm soát nén. Các nén kiểm soát IE chỉ có nén dữ liệu thô. Các tiêu đề kiểm soát nén chứa các thông tin sau: | 208 Mobile Messaging Technologies and Services service but interoperability issues are still to be solved and penetration of MMS phones has to grow in order to allow a mass adoption of the service by mobile subscribers. During deployments of initial MMS solutions open standards for MMS were evolving to enable future service evolutions and solving early interoperability issues. Consequently improved MMS solutions are now emerging in the market. They leverage initial MMS implementations with the support of new features and new media formats. Certain MMS solutions already support the exchange of sophisticated media objects such as video clips and vector graphics. This will progressively lead to the transport and storage of larger messages. In the context of MMS the concept of Multimedia Message Box MMBox will ease the management of large messages by allowing the storage of multimedia messages in networkbased user personal stores . message boxes online photo albums etc. . The wide-scale deployment of these new features is still to be accomplished by network operators. This deployment faces interesting technical and marketing challenges. This chapter and the following one attempt to address some of them. This chapter places MMS in the patchwork of existing messaging services. It identifies the key success enablers for MMS and compares MMS features with those offered by other messaging services. It then provides a description of the different use cases for MMS and explains how multimedia message can be designed. MMS Success Enablers The commercial introduction of MMS started in March 2002. The future success of MMS is believed to rely on the following five main enablers Availability and penetration of MMS phones mobile users require MMS-enabled phones for composing and sending multimedia messages. Availability of phones is less critical for message reception and viewing since with message transcoding in the network side users are often able to send messages to .
