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 | [email protected]
Fig 4 Evaluation scenario
results and conclusions
Recommended
