IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-09-0072-02-bcst Title: Considerations for Broadcast Handover Date Submitted: May 12, 2009 Presented at IEEE 802.21 session #32 in MONTREAL Authors or Source(s): Changmin Park, Hongseok Jeon, Junghoon Jee, Hyunho Park, Eunah Kim (ETRI) Abstract: Considerations for Broadcast Handover.

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Terminology Downlink-only (DO) technology Bidirectional technology Mobile broadcasting system such as DVB-H, T-DMB, MediaFLO, ATSC-M/H and so on. Bidirectional technology Telecommunication system (3GPP, 3GPP2), mobile communication system (WiMAX, WiFi) and fixed comminication system (Ethernet) General DO Technology No relationship with bidirectional technology. Hence the general DO technology has no uplink channel. DO Technology with Return Channel Tightly coupled with the bidirectional technology. Bidirectional technology is used for uplink data and control.

Service Consideration Bidirectional technology offers following services: Real-time streaming service On-demand service Interactive service DO technology offers following services: Fixed service for unspecified individuals Cost sharing and High quality AV service What if an user using on-demand service on the bidirectional technology tries to handover to the DO technology? Is it possible that the DO technology dynamically provide customized contents ? Do we need a service discovery before handover ?

Handover Consideration Handover from DO technology to bidirectional technology If “DO technology with return channel” is used, IEEE 802.21 can be used. If “general DO technology” is used, IEEE 802.21 cannot be used. MIH protocol typically requires uplink communication. Handover from bidirectional technology to DO technology IEEE 802.21 can be used as usual. IEEE 802.21 handover typically requires uplink communication.

Information Service Consideration MIIS on “DO technology with return channel” The return channel (bidirectional technology) can be used for providing MIIS. MIIS on “General DO technology” Only MIH Push Information is possible for MIIS. DO technology coverage is larger than bidirectional technology. Hence MIIS on “General DO technology” provides too general network information compared to MIIS on “DO technology with return channel”. MIIS requires uplink communication to provide more meaningful information. DVB-H cell coverage is about 30km. Vs. UMTS cell size is about 10km.

Summary 802.21b needs to query information about ongoing session (e.g. TV program) as well as resource on the target network. DO technology cannot always provide identical contents that bidirectional technology presents. 802.21b should consider only “DO technology with return channel” as DO technology. Handover typically requires uplink communication. MIIS requires uplink communication to provide more meaningful information.