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برودكست /توزيع سرويس هاي مالتي كستeMBMS

غنداليسپيده : ارائه دهنده اداره كل تحقيقات و جهاد خودكفايي

95/12/3

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Contents

LTE eMBMS Technology Overview

eMBMS architecture

LTE‐MBMS MBSFN principle

Enhancement for TV Applications within LTE 4G

Progress in 3GPP standardization for TV broadcasting 

(Current & Recent Advances)

Mobile Broadcast Convergence Industry Standards Group

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MBMSMultimedia Broadcast Multicast Services (MBMS) is :

Point‐to‐multipoint interface specification for existing and upcoming

3GPP cellular network.

Designed to provide efficient delivery of broadcast and multicast

services, both within a cell as well as within the core network.

For broadcast transmission across multiple cells, it defines transmission

via single‐frequency network configurations.

Target applications include mobile TV and radio broadcasting, as well as

file delivery and emergency alerts.

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eMBMS Efficiently Delivers Rich Media to Mass Users

Unicast  One to one transmission  Each user sends and receives data individually  Apps: VOD, E‐mail, web‐browsing, MMS, Media downloads 

Broadcast/Multicast  One to many transmission  More efficiency and lower cost for common content  Apps: Live Video/Audio streaming, push media, e‐publication, application download, OS updates 

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eMBMS Enhances Efficiency

Highly efficient in delivering popular content to mass number of users

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MBMS & eMBMS

MBMS has been standardized in various groups of 3GPP

The first phase standards are found in UMTS release 6(2004).

eMBMS has been standardized in various groups of 3GPP as part of LTE

release 9.

The LTE version of MBMS, referred to as Multicast‐broadcast single‐

frequency network (MBSFN), and is based on a Single Frequency Network

(SFN) based OFDM waveform.

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Delivery of Broadcast Content over LTE Networks

A Multimedia Broadcast/Multicast Service (MBMS) was standardized by 3GPP and since 

Release 9 it is called ‘evolved MBMS’ or eMBMS.

eMBMS traffic is time multiplexed with unicast traffic, which can be used to enable

interactivity for broadcast services or upcoming "Hybrid‐Digital‐TV" services.

In the time multiplexed configuration, up to 6 out of the 10 sub‐frames of a radio frame can 

be dedicated to MBMS in the FDD mode (or up to 5 in the TDD mode). 

eMBMS can employ a single‐frequency network configuration, like DVB‐T, establishing a so‐

called MBSFN. 

Cells in an MBSFN area have to be tightly time synchronized, similar to e.g. DVB‐T/T2 single 

frequency networks. 

eMBMS is built on the LTE downlink OFDM physical layer with a cyclic prefix of 16.7 μs. This is 

longer than what is typically used for LTE unicast.

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Delivery of Broadcast Content over LTE Networks

On the transport layer, eMBMS employs IP packets.

eMBMS provides a streaming and a file download service type.

As fast retransmissions are not supported in eMBMS, increased

transmission robustness can be achieved by additional forward error

correction on the application layer (AL‐FEC) working on IP packets.

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MBMS  Technical Description

The MBMS feature is split into the MBMS Bearer Service and the MBMS User Service and has

been defined to be offered over both UTRAN (ex. WCDMA) and LTE (often referred to as

eMBMS).

The MBMS Bearer Service:

includes a Multicast‐ and a Broadcast Mode 

The MBMS Bearer Service uses IP multicast addresses for the IP flows. 

The advantage of the MBMS Bearer Service compared to unicast bearer services

(interactive, streaming, etc.) is, that the transmission resources in the core‐

and radio network are shared.

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MBMS  Technical Description

The MBMS User Service:

basically is the MBMS Service Layer and offers a Streaming‐ and a Download 

Delivery Method.

– The Streaming Delivery method can be used for continuous 

transmissions like Mobile TV services. 

– The Download Method is intended for “Download and Play” services.

To increase the transmission reliability, an application layer FEC code may be 

used.

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Multicast‐broadcast single‐frequency network (MBSFN)

MBSFN is a communication channel defined in the fourth‐generation cellular 

networking standard (LTE).

The transmission mode is intended as a further improvement of the efficiency of 

the enhanced Multimedia Broadcast Multicast Service (eMBMS), which can deliver 

services such as mobile TV using the LTE infrastructure.

This enables network operators to offer mobile TV without the need for 

additional expensive licensed spectrum and without requiring new 

infrastructure and end‐user devices.

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MBSFN Technical detailsMBSFN is a transmission mode which exploits LTE's OFDM radio interface tosend multicast or broadcast data as a multi cell transmission over asynchronized single‐frequency network (SFN).

The transmissions from the multiple cells are sufficiently tightly synchronizedfor each to arrive at the UE within the OFDM Cyclic Prefix (CP) so as toavoid Inter‐Symbol Interference (ISI).

In effect, this makes the MBSFN transmission appear to a UE as atransmission from a single large cell, dramatically increasing the Signal‐to‐Interference Ratio (SIR) due to the absence of inter‐cell interference.

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MBSFN Gain

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MBSFN Area Defines eMBMS Broadcast Service

MBSFN Area is an area of eNBs from which the same eMBMS content can be synchronously transmitted• Overlap between MBSFN areas is supported

– One eNB can belong to up to 8 MBSFN areas

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No Edge” User Experience

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eMBMS and MBSFN Transmission

• Efficient mechanism to deliver common content over LTE networks – Reuse LTE network infrastructure and wideband OFDM signal design – Up to 60% of subframes can be allocated to eMBMS traffic 

• OFDM signals enhance the gain from single frequency network transmission – Synchronous LTE network allows broadcast over a Single Frequency 

Network (MBSFN) • Same signal transmitted synchronously by multiple eNBs within an MBSFN 

area 

– Efficient signal combining at UE receivers to achieve high operating SNR 

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eMBMS Channel Structure is Compatible With LTE

eMBMS and unicast transmissions are mixed by TDM in one common LTE carrier:• FDD subframes 1/2/3/6/7/8 can be configured as MBSFN subframes

– First 1 or 2 symbols are used for unicast common signal and control channels– Transmission gap lies in between unicast and MBSFN symbols if CP lengths are different

• MBSFN is not transmitted in subframes 0/4/5/9 (FDD) or 0/1/2/5/6 (TDD)– Needed for unicast services and control channels/signals

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Existing LTE Carriers Can be Flexibly AllocatedBetween Unicast and Broadcast

Example of LTE network resource TDM allocation

LTE resources reserved for eMBMS only when needed No impact on LTE unicast capacity at other times

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eMBMS Provides Excellent Broadcast Performance

eMBMS potentially delivers highest rate in dense urban deployment 

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eMBMS System Reuses LTE eUTRAN Elements

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MBMS DeploymentMBMS Mobile Broadcast technology has never been deployed by any operator in the world.

Various mobile operators in the UK had conducted trials for MBMS‐based mobile TV.

AT&T announced plans to use the 700 MHz Lower D and E Block licenses it acquired in 2011 from Qualcomm for an LTE Broadcast service.

In 2014, several major operators are lining to deploy and test the technology. The front runners being Verizon, Reliance and Kt. 

In July 2014, Nokia Networks demonstrated the use of LTE Broadcast for Traditional Digital TV.

In August 2014, Ericsson and Polkomtel successfully tested LTE broadcast technology by streaming the opening game of the 2014 World Volleyball Championship to hundreds of guests at Warsaw’s National Stadium in Poland on August 30.

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eMBMS Trials 

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Main characteristics of MBSFN

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3GPP MBMS for Broadcast

EBU TR 027 “Delivery of Broadcast Content over LTE Networks” found that

• Free‐to‐air service is possible, given certain assumptions.

• Service discovery without uplink is possible, with preconfigured 

information.

• A trade off exists between spectral efficiency and density, with larger 

inter‐site sizes preferred due to cost.

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EBU engagement with 3GPP

EBU engagement with 3GPP around enhancing mobile standards for 

broadcast

‐ Better access for services on mobile handsets

‐ Broadcast capabilities for roof‐top reception

• Regulatory requirements

‘EnTV’ – Enhancement for TV Applications within ‘4G’

‐ Additions to eMBMS, the broadcast mode of LTE ‘4G’

‐ Targeting 3GPP Release 14

‐ Some features may come later in Release 15

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General Broadcaster Requirements

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Service Requirements for 3GPP Rel‐14 LTE

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TV Enhancements

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Support for Larger Cells – Extended Cyclic Prefix

Rel‐14 changes in frame structure allow higher inter‐site distances by extension of cyclic prefix‐ Improved coverage in rural areas and more efficient network deployments‐ Allows reception in fixed rooftop antennas‐ Transmission mode can support fixed rooftop, portable outdoor & mobile at moderate speeds

20% overhead due to cyclic prefix in all LTE modes

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Flexible Network Capacity – a 100% Broadcast Carrier

Release‐14 removes the 60% eMBMS subframe allocation restriction to increase

broadcast system capacity while maintaining the possibility of multiplexing with

unicast transmissions

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Rel‐13 allows up to 60% subframe

allocation for broadcast 

‐ Broadcast multiplexed with Unicast

Rel‐14 allows two modes of 

broadcast operation:

‐ 100% subframe allocation

‐ Legacy 60% subframe allocation

Shared Infrastructure – Mixed Unicast/Broadcast Use

Ability to share broadcast content across multiple networks

‐More efficient use of resources than duplicating

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Service Layer for TV Service

MBMS Service Type 1 – Transport Only Mode‐ The 3GPP network would provide transparent transport of data/TV content‐ All other service aspects performed by application server‐ 3rd party signaling and content carried over eMBMS bearer, e.g. DVB Transport 

Stream

MBMS Service Type 2 – Full eMBMS TV stack specified within 3GPP

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TRAPI and xMBMS

MBMS Transport Protocol and API (TRAPI) provides application friendly methods 

and interfaces to 3GPP MBMS User services for the UE.

• Improves application integration, simplifies interactions.

Extended MBMS (xMBMS) interfaces between the 3GPP Enhanced Packet Core 

and Content Providers.

• Provision services and expose service capabilities via APIs.

• For control (authentication and authorization, session control, announcement), 

user plane content delivery and reporting.

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Current 3GPP Activities

Agreement

‐ Support for Larger cells – Extended cyclic prefix (up to 200 us)

• enables larger cell sizes and supports rural coverage

‐ Flexible Network Capacity –100% eMBMS carrier

‐ Details of synchronization and service information acquisition

Work in progress

‐ Free‐to‐air

‐ Receive‐only

‐ Shared infrastructure

‐ Service Layer for TV Service

• Type 1 – eMBMS as a transparent pipe for, e.g. DVB Transport Stream

• Type 2 – Full eMBMS TV stack specified within 3GPP

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Other Advances

TV over 3GPP Services (Video profiles for consistent quality of experience)

• Requirements and guidelines for video source formats and encoding parameters 

for different types of TV services including linear TV, catch up TV or on‐demand.

• Defined Operation Points consider specific definition (SDTV, HDTV, etc.) and 

other parameters for consistency and testing e.g. spatial & temporal resolution, 

suitable lower resolution for seamless switching, minimum service quality. These 

are aligned with broadcast industry practices.

VR Study

• Considers use cases, content encoding, delivery, overcoming latency and 

synchronization challenges.36

5G Standardization

3GPP Timeline

1. ‘EnTV’ work initiated2. Broadcasters input requirements3.Broadcaster membership of 3GPP and direct technical support plus meeting attendance4. Phase 2 development of 5G to consider multicast/broadcast for Media & Entertainmentvertical amongst others. Opportunity for broadcasters to input further requirements

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System Level Broadcast Requirements

Requirements for “Enhanced Mobile Broadband” will be specified by March 2017.

Study concluded “Potential Requirements” include:

• The 3GPP system shall be able to support user experienced broadcast data rate 

up to [300Mbps] (e.g. video streams such as 4k UHD or 8k UHD).

• The 3GPP system shall be able to support at least [15] broadcast channels of 

[20Mbps] each simultaneously over the same carrier.

• The 3GPP system shall be able to provide round trip delay including 

coding/decoding in the magnitude of 10‐12ms and be able to provide bandwidth 

capable of running an 8k 3D video streaming [250Mbps] for uplink and downlink.

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5G Requirements for Broadcast in RAN

The “New Radio” (NR) will support existing Multicast/Broadcast (M/B) services and new services In addition NR shall support:

– dynamic area adjustment based on e.g. user density and service requirements.

– Static and dynamic resource allocation between M/B and unicast up to 100% of DL resources.

– M/B Network Sharing between participating MNOs.

– Allow large cells (up to 100km radius), and local, regional and national broadcast areas.

– Mobility up to 250 km/hr for TV services

– Backwards compatibility with 4G

Multimedia Broadcast/Multicast Service for 5G study is ‘on hold’ until March 2017. Essentially this means this topic is deferred until Release 16 (to freeze March 2020.)

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Mobile Broadcast Convergence

Industry Standard Group (ISG)

Mobile and Broadcast Convergence (MBC)

https://portal.etsi.org/tb.aspx?tbid=850&SubTB=850

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ETSI ISG MBC Mission Statement

The group will develop use cases and commercial requirements enabling future wirelessnetworks to deliver more efficiently mass market broadcast services to mobile devices.

Delivering both linear and non‐linear media over converged networks will create appealingservices and be very beneficial to existing standardization work ongoing in the area ofeMBMS in 3GPP as well as future 5G standards.

A comprehensive report will be produced exploring the deployment and business 

models of converged networks encompassing all industry views.

The ISG will take into account the potential benefits and challenges from the 

commercial, regulatory and technical perspectives of all interested parties.

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ISG MBC:Current Members and Participants List

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References

Mobile Broadcast Convergence Industry Standards Group/ EBU Forecast 2016 24 Nov 2016

3GPP Mobile Broadband Media Distribution Advances/ EBU Forecast, November 23‐24, 2016,

Geneva, CH

EBU Engagement with 3GPP, the 3rd Generation Partnership Project, A Broadcaster’s

Perspective/ BBC Research and Development/ EBU Forecast 2016

eMBMS Delivers Mobile Video To The Mass Audience/ Huawei Technologies 2015

TR 027 , delivery of broadcast content over lte networks/ Geneva July 2014

TR 029 , DVB‐T2 single frequency networks and spectrum efficiency/ Geneva November 2014

Alcatel‐Lucent, eMBMS, Wim Brouwer , LTEMay 2013

QUALCOMM Research, LTE eMBMS Technology Overview/ November 2012

MBMS support in E‐UTRAN, 3GPP‐DVB Workshop, Kansas City, USA 16th March 2011

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Thank You

QUESTIONS ?

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