Using geo-spatial session tagging for smart multicast session discovery
Proceedings of the 2009 ACM symposium on Applied Computing - SAC '09
IP multicast is increasingly seen as efficient mode of live content distribution in the Internet to significantly large subscriber bases. Despite its numerous benefits over IP unicast, multicast has not seen widespread deployment over modern networks. Network complexity and session discovery issues have plagued IP multicast since its inception. The Internet research community is in general agreement to move over to SSM (Source Specific Multicast). With IGMP v 3 (Internet Group Management
... l) and SSM, the source discovery burden will rest with the end user. Channel discovery is one of the few stumbling blocks remaining to be solved for successful and widespread deployment of multicast. In an earlier work a DNS (Domain Name System) aware multicast session discovery architecture, mDNS, has been proposed which is distributed, hierarchical and globally scalable. In this paper authors propose to leverage mDNS architecture by enabling multicast sessions to be tagged using geographical and spatial information based on the channel contents or service provider location. They further propose automatic geo-coding of session registration information as the content provider registers session information with mDNS. They also provide necessary design changes and give data models and data structures to support seamless location sensitive session retrieval as part of search query results to be furnished to the end user. They have also envisaged scenarios in which geo-tagging would enhance end user experience and would enable smarter query result generation.