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With the development of the wireless handsets and 3G wireless networks, the demands of multimedia messaging service becomes increasingly important and the service is expected to be one of major services in the wireless communication systems. However, sending and receiving multimedia messages through the mobile phone have their faults. For making use of the PC's handling ability, this paper proposes the design method of a mobile multimedia messaging service (MMS) system. Connected a PC with a mobile phone through a serial port or a USB port, used VC++6.0 as the development platform, and based on windows serial communication, database programming of ADO smart pointers etc., the system is designed and implemented. In order to improve the sending efficiency and real-time performance of MMS, a MMS message real-time parallel sending algorithm based on multithreading is proposed.
Technologies continuously evolve to meet the challenging needs of wireless communication. The ever growing demand for wireless communication requires greater capacity and higher network efficiencies. Spectral efficiency is a key driver of the economics of voice and data services as we approach the rollout of 3G network. In this paper we discuss the technology trends and challenges associated with conversational voice services in the context of fixed mobile conversion. We discuss evolution in cellular modem technology, switching technology, and speech coding technology. The combination of voice over Internet protocol and wireless communication promises to revolutionize the whole telecommunication market.
The Fast mobile IPv6 network (FMIPv6) should support guaranteed QoS for a large-scale real-time multimedia transmission and mobility, but exiting transport layer mobility scheme such as mSCTP has some defect in aspect of pathover and throughput. Based on this, we make a potential change to mSCTP by adding QoS-measurement-chunk, which is used to take into account information about wireless link condition in reselection/handover process of FMIPv6 network. In this paper, we also proposed an algorithm named congestion- oriented pathover (COP) to detect congestion of the primary path using back-to-back RTTs. Therefore, the proposed scheme with congestion-oriented pathover (COP) is more robust to adapt change of the wireless link parameters. A demonstrate using simulation is provided showing how the proposed scheme provides better performance to pathover and throughput, and further to guaranteed QoS. Correspondingly, the proposed scheme outperforms previous improvement and current mSCTP.
Wireless local-area networks represent a viable broadband Internet access solution for enterprise, residential and public areas. Due to its short range radio, multiple wireless access points are necessary to cover a certain physical area. The tendency of mobile users to group in certain areas of interest and of mobile devices to connect to the access point with the highest signal strength determines the overall network load to be highly unbalanced. To overcome this issues which drastically affects user bandwidth share as well as the efficiency of network resource utilization, special load balancing techniques has to be employed. This paper presents the multimedia mobility management system (M3S), a quality oriented mobility management framework which aims at maximizing user perceived multimedia quality by efficiently distributing the traffic load over all the communication resources available. Simulation based testing results are presented, outlining the performance of M3S against other load balancing techniques which rely on mobile device re-association with least congested access points.
