1. IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-09-0072-00-0000
Title: Considerations for Broadcast Handover
Date Submitted: May 11, 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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The contributor is familiar with IEEE patent policy, as stated in Section 6 of the IEEE-SA Standards Board bylaws < and in Understanding Patent Issues During IEEE Standards Development

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
DO technology coverage is larger than bidirectional technology.
DVB-H cell coverage is about 30km. Vs. UMTS cell size is about 10km.
In “DO technology with return channel”, the bidirectional technology can be used for providing MIIS.
In “general DO technology”, MIH Push Information is possible for MIIS.
However, MIH Push Information via the DO technology provides too general network information because DO technology delivers same contents to plenty of users.
MIIS requires uplink communication to provide more meaningful information.

7. Summary
802.21b needs to query contents information (e.g. TV program) as well as resource required for handover.
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.