Abstract
This paper proposes the multicast system for seamless live multimedia in a wireless network. The multicast technique for live multimedia and a part of handover mechanism are performed on the buffered multicasting/switching agent (BMSA) in a wireless local area network (WLAN). The rest of the handover mechanism is performed on access points (APs). This paper uses a new Internet Protocol (IP) header that is composed of three AP numbers (AP_#s) and 1-bit overwrite bit (OB) to perform seamless service. The three AP_#s support a smooth handover for solving the cutoff service when mobile nodes (MNs) move among other APs in WLAN. The overhead for a new IP header (2 bytes long) is negligible in comparison with multimedia service, and the overhead for the multicast group address (MGA) packet that is used in the transmission of MGA is only 11 bits. The MGA packet is composed of two AP_#s, an overwriting group address (OGA) bit, and MGA. We confirmed that the proposed multicast system can decrease the number of channels required, the delay of service, and the possibility of packet duplication because multicast is not provided on the multimedia server but on the BMSA in WLAN.
Highlights
The multimedia service on the Internet has many problems including insufficient network bandwidth in a wire/wireless network and an excessive load of the server
Providing multimedia service in a wireless local area network (WLAN) has many problems including cutoff service and reconnection to the server caused by the movement of mobile nodes (MNs) such as tablet PCs, laptop computers, and personal digital assistants (PDAs) [4,5]
The structure of the multicast group address (MGA) packet and access points (APs):MN mapping table is simpler than references [8,9]
Summary
The multimedia service on the Internet has many problems including insufficient network bandwidth in a wire/wireless network and an excessive load of the server. MNs are reassigned a new one whenever they travelling among APs. MNs have to reconnect to the server to sustain service when they are connected to other APs. In this paper, the AP assigns 2-byte-long AP_# fields as an IP header and IP address only if MN enters WLAN for the first time. It can receive multicast live multimedia streams transmitted with MGA_#005. The proposed mechanism supports a seamless live multimedia service without reconnection to the server and cutoff caused by the MNs' movement among APs. The multicast technique is initiated on the BMSA when some MNs controlled by the same AP or different APs request the same live multimedia.
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