1. 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 session #32 in MONTREAL
Authors or Source(s):
Changmin Park, Hongseok Jeon, Junghoon Jee, Hyunho Park, Eunah Kim (ETRI)
Abstract: Considerations for Broadcast Handover.

2. IEEE 802.21 presentation release statements
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3. 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.

4. 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 ?

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

6. 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.

7. 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.