Wave of connected devices leads to novel video broadcasting services pushing networks above capacity limits (e.g. GoPro, Google Glass)

The hierarchically centralized nature of mobile architectures is shifting towards a flatter architecture

IP multicasting is a key enabler for multimedia delivery

Empowering IP Multicast for Multimedia Deliveryover Heterogeneous Mobile Wireless Networks

S. Figueiredo, S. Jeon, R. L. Aguiar

motivation and problem statementFacts

How to jointly assure…

Fast and technology-agnostic handover Fast acquisition of multicast channel subscription of mobile users over heterogeneous mobile networks

Problem

1)2)

solution overview

Distributed mobility architecture following a cross-layer design and leveraging on IEEE 802.21 Media-Independent Handover and Context Transfer Protocol

Application of multicast context transfer in Distributed Mobility Management (DMM) environment

Orchestration between mobile device and Distributed Mobility Access Routers (DMARs) enables synchronous layer 2 and layer 3 handovers

General description

source: gopro.com

Fig 1 Mobile broadcasting scenario

Video Flow Manager (VFM)• Manages the network-side resources, preserving the video session during mobility (i.e. mobility schemes, network selection, activation of radio resources)• Located at each DMAR and handles MIH, Multicast routing and Multicast Context Transfer functions, including a Multicast Mobility Database (MMD) storing all nodes’ multicast subscriptionsMulticast Connection Manager (MCM)• Manages radio interfaces and service interfaces calls during HO• MIH User providing mobile devices awareness to L2 and L3 mobility

OperationFig 2 Proposed architecture

• Scenario: mobility from WLAN to LTE access• Proposed scheme (CXT) VS solution leveraging on the MCM operation but following standard MLD signaling procedure (NO_CXT)

Multicastnetwork

nDMARpDMARMN

HO trigger & preparation, resource query, target selection

HO completion

TCXT

MCXT.req

MCXT.ackPIM Join

TJOIN

TOFFSET

Retrieve subscription list

MIH Link Up & service interface update

Multicast

MulticastTDISRUPT

_CXTTTOTAL

MLD Report

PIM Join

MulticastTDISRUPTNO_CXT

Multicast

Fig 3 Multicast handover signaling

Multicast

Results summary (Table I):• TDISRUPT_NO_CXT > 1s > TDISRUPT_CXT

• TOFFSET shows the improvement of using MCXT over MLD (aprox. 0.5s)

• Target DMAR took 12.8ms to join the multicast tree (TJOIN)

The experimental results emphasize the advantages of the solution for inter-tech multicast handover

TJOIN

TTOTAL

TOFFSET

TDISRUPT_CXT

Delay factor

TCXT

Value (ms) Std Deviation (ms)

12.80

590.46

2.34

127.10

553.67

429.22

5.10

0.03

0.89

2.70

570.54

230.01

Specific to MCXT

Specific to NO_CXT

Table I Evaluation results

TDISRUPT NO_CXT

WLAN

Media Independent Information ServerNetwork Backend

pDMAR nDMAR

DMAR1

Live streamer(encoding & marking)

LTE

Receiver ReceiverMobility

INFOCOM, Toronto | April 2014 Contact Rui Aguiar | ruilaa@ua.pt

Fig 4 Evaluation scenario

results and conclusions