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Copyright © IDATE 2014

eMBMS (evolved Multimedia Broadcast and Multicast services)

17

eMBMS is the 4G version and an update of Multimedia

Broadcast Multicast Service (MBMS) relying on 3G

specifications. 3G networks included the MBMS

functionality enabling multicast/broadcast service on

WCDMA/HSPA networks but there was a need to

implement additional functions in the handset. There was

no real commercial implementation of MBMS.

The eMBMS standard is supported in 3GPP Release 9 but

the feature that enables dynamic handoff between unicast

and broadcast is part of LTE Releases 11 and 12.

Implementation of eMBMS should be trouble-free as

devices will not be specific. The main barrier linked to

MBMS adoption for 3G, namely the need for specific

devices, has been removed.

eMBMS is a promising technology, being tested in 2014 in

the USA with the Super Bowl target. Unlike the MBMS

failure, eMBMS is supported by telecom heavyweights

(Verizon and Qualcomm), and this is the main factor of its

success. With eMBMS, LTE networks will be able to

support broadcast and multicast along with unicast, and

the same frequency layer can be used for all these

distribution modes. The most interesting feature of

eMBMS, as stated above, is that it will enable dynamic

broadcasting, or dynamic traffic allocation on the least

congested networks, in real time. Technically, up to 60% of

capacity could be allocated to eMBMS traffic and the rest

to unicast (40%). Moreover, some new business cases for

eMBMS have already been identified.

How MBMS works

Release MBMS support

Release 8 Does not support eMBMS at all

Release 9 Very simplified version introduced: focus on linear-TV, broadcast

mode only, no multicast. Very low operator interest

Release 10 Additional features:

‘counting’ of eMBMS interested UEs if the network is expected to

enable MBSFN

allocation and retention priority (ARP) enables priority between

eMBMS sessions

Allows unicast reception in MBSFN subframes

Release 11 Support of service continuity improvements for eMBMS services

Overview of MBMS support in 3GPP

Source: IDATE from Deutsche Telekom

Source: Ericsson

Copyright © IDATE 2014

The most likely scenario

22

Scenario 3 is the most likely scenario

In this scenario, an additional portion of the 470-694 MHz

band will be used by mobile networks and another portion

of this band could be used by hybrid networks based upon

eMBMS and cellular architecture (Low power, low tower -

LPLT). 30 free DTT channels with HEVC/DVB-T2 (MPEG4)

would still be availaable in a reduced portion of the UHF

spectrum.

&

Scenario 3

Share of 470-694 MHz for broadcast only 30-40%

Share of 470-694 MHz for mobile only 40%

Share of 470-694 MHz for mobile & broadcast (hybrid

networks)

20-30%

Services A major shift to on-demand video consumption jeopardises the smallest DTT linear TV channels. Some of

them shut down.

Terminal Hybrid DTT/LTE boxes are widespread, LTE TV dongles develop fast

TV receivers will have to include an eMBMS modem

Network type (HPHT, LPLT) DTT move to Medium power to target indoor, second TV set reception

The 600 MHz band is used by LTE downlink for eMBMS

Part of the 470-600 MHz is used by LTE downlink for eMBMS but on a co-primary basis (coordination with

broadcast necessary)

Usage (mobile, nomadic, fixed, mixed) Personal devices (tablet, smartphones) are a common place to view linear and on-demand video including

outdoor and in mobility

TV Everywhere fully materialised

Access technology (DVB-T, DVB-T2, LTE, 5G, other) LTE combine linear and on-demand video

Broadcast TV networks are fully IP compatible, for instance through DVB T2-GSE implementation

Impact on broadcast sector DTT for primary TV access is marginalised

Hybrid networks development LTE provides an alternative for fixed TV reception

A major question is if DTT can offload some LTE linear traffic?

New network configurations develop between DTT and LTE for IP video traffic dynamic allocation

Impact on mobile sector More spectrum available for LTE downlink and eMBMS

Impact on other users (notably PMSE) Some limitations on the use of PMSE in the UHF band

Spectrum sharing Sharing of part of the 500-600 MHz band

Need for regulatory changes?

Impacts for the consumer Consumers have to assume the costs of switching TV reception equipment. FTA TV access is at stake.

Terrestrial

mobile (IMT)

Terrestrial

mobile likely

Terrestrial

broadcasting

600

MHz800

MHz

900

MHz1 GHz

UHF

470

Band #8

(GSM,

UMTS,

LTE)

500

MHz

791-821

IMT

694

Band # 20

(LTE)

700

MHz

832-862 880-915 925-960

Band # 28

(LTE)

400

MHz

Source: IDATE, in Spectrum for mobile broadband and broadcasting, September 2014

Source: IDATE, in Spectrum for mobile broadband and broadcasting, September 2014