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IEEE 802.21 MEDIA INDEPENDENT HANDOVER

DCN: 21-08-0147-00-0000 Title: DVB-H Networks

Date Submitted: May, 2008

Presented at IEEE 802.21 session #26 in Jacksonville

Authors or Source(s):Burak Simsek (Fraunhofer Institute)

Juan Carlos Zuniga (InterDigital)

Abstract: This presentation summarizes DVB-H characteristics and describes the service discovery procedure of DVB-H.

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IEEE 802.21 presentation release statementsThis document has been prepared to assist the IEEE 802.21 Working Group. It is

offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.

The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.21.

The contributor is familiar with IEEE patent policy, as outlined in Section 6.3 of the IEEE-SA Standards Board Operations Manual <http://standards.ieee.org/guides/opman/sect6.html#6.3> and in Understanding Patent Issues During IEEE Standards Development http://standards.ieee.org/board/pat/guide.html> 

IEEE 802.21 presentation release statementsThis document has been prepared to assist the IEEE 802.21 Working Group. It is

offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.

The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.21.

The contributor is familiar with IEEE patent policy, as stated in Section 6 of the IEEE-SA Standards Board bylaws <http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and in Understanding Patent Issues During IEEE Standards Development http://standards.ieee.org/board/pat/faq.pdf> 

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DVB Networks

Modulator &TransmitterMultiplexer

MPEG-2 TV ServiceMPEG-2 TV Service

MPEG-2 TV Service

- MPE- Time Slicing

PSI/SI Management

Program Specific Information / Service Information (PSI/SI) Management

IP Services

DVB Transmitters

Cell_1

Cell_2

Cell_3

Cell_x

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DVB-H Transport Structure

Here are the IP streams

TV Channels / IP Services

Broadcasters

DVB-H Network Providers

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IP within DVB

• IP Platform: A set of IP/MAC streams and/or receiver devices managed by an organization

- The IP/MAC platform concept allows for the coexistence of several non-harmonized IP/MAC address spaces on the same DVB network

• Two IP streams carry the same IP datagram stream if: - Source IP addresses are identical

- Destination IP addresses are identical

- IP streams are associated with the same IP platform

- Destination IP address is not in unicast range

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Handover from X to DVB-H

Popular Multimedia Services, hence unidirectionalHandover is triggered by some means from X to

DVB-H

What kind of information do we need in order to switch to the same stream?

Without any prior information it is possible to have this information but takes too long…

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First Step:Scanning / Tuning

Worst case: Whole Frequency scanning (e.g. 470MHz – 862MHz)

NIT_actual – NIT_other • Reduces the frequencies to be scanned to a specific list

If does not exist, either found frequencies are used or whole scan is carried on

For each found network, accomplish tuning Search within transport stream if the IP service

exits or not…

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Finding the right service

Header Payload

4 bytes

188 bytes

Header Payload PayloadHeader

Syncbyte

Transporterror

indicator

Payloadunit startindicator

Transportpriority PID

Transportscrambling

control

Adaptationfield

control

Continuitycounter

Adaptationfield

8 1 213 41 1 2

Packet IDentifier

Finding right service means finding the right PID (packet identifier)

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How to find PIDs

PAT (pid=0)

1 100

2 200

3 300

4 400

10 A 1000

11 V 1100

12 D 1200

13 D 1300

PMT (for pid=200)

Service_id

pmt_pid

elementary_pid

stream_type

component_tag

AAAGASDGJHGHMHSHAGAAAAAAAAAAA

VJDGHDGHKGHKFGHKFGRTUWRTZWWRZ

HGJDGHNVBNRSTHWRTHWRTHWRTHRTH

GHSHGJJJFGDDDDDDDDDDDDDDDDDDD

Multiplex

ServiceComponentelementary_stream (pid=1000)

Program Association Table

Program Map Table

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How to find PID of an IP Stream

1. Find network and tune2. Find NIT_actual of the tuned

network3. Find NIT_actual of the new network

which includes INT link_descriptor4. Find service ID of INT table of the

platform we are interested in5. Find the PID of the INT table for the

PMT6. Find the PID of the IP service

(based on the IP Address) from INT7. Find the PID of the IP Service for

the PMT8. Find PID of the elementary stream

(IP Stream)

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Parameters for Optimum Handovers withDVB-H

Parameters Source Remarkcell_id TPS bits Uniquely cell identifier for DVB-T/H

cell_list_descriptor NIT To announce cells and sub-cells of the DVB-H network

cell_frequency_link_descriptor NIT To announce all frequencies used to transmit the TS within the DVB network

original_network_id NIT typically allocated by DVB on a per country basis

network_id NIT

transport_stream_id PAT Identifies uniquely an TS within an “original” DVB network

linkage_descriptor NIT to announce INT

service_id PMT Identifies a DVB service

component_tag Identifier for a component of a DVB service

Platform_id INT identifies an IP platform

IP source/destination address INT Identifies a single IP stream

PID PAT/PMT Identifier for component_tag

* not an exhaustive list

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Handover Overview XDVB-H

In case service exists over DVB-H make handover decision Else DAIDALOS could consider creating the service in case of

demand, but currently DVB-H would not…(no .21 problem) They target customized services as the next steps…

No resource availability check (avoid this)

Inform DVB Network about the handover complete (optional)

Inform Network X about handover complete (optional) Multicast leave can be synchronized with this information

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Thanks For Your Attention

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Program Specific Information / Service Information (PSI/SI)

• PAT: Program association table (helps finding services)

• PMT: Program Map Table (helps finding components of services)

• NIT: Network Information Table (gives network specific PHY information)

• INT: IP/MAC Notification Table (helps finding IP services)

• CAT: Conditional Access Table

• SDT: Service Description Table

*(not an exhaustive list)

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IP Matching

• Platform_id and IP source/destination addresses must be available in case there is no PID available

• Multicast IP addresses for each IP Platform are globally defined, hence IP addresses can be saved before

• ESG (Electronic Service Guide) of DVB-H provides IP Platform ID and IP Address of all available service…

• MIIS can provide with the ESG similar data enabling faster IP Platform ID – IP address information acquisition