Leverage IEEE 802.21 for intelligent multicast session initiation, mobility (context transfer) and leave, enabling seamless receiver mobility in intra- and inter-technology handovers.

1. Empowering IP Multicast for Multimedia Delivery
over Heterogeneous Mobile Wireless Networks
S. Figueiredo, S. Jeon, R. L. Aguiar
motivation and problem statement
Facts
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
Problem
How to jointly assure…
Fast and technology-agnostic handover
Fast acquisition of multicast channel subscription of mobile users
over heterogeneous mobile networks
1)
2)
solution overview
General description
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
source: gopro.com
Fig 1 Mobile broadcasting scenario
Operation Fig 2 Proposed architecture
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 subscriptions
Multicast Connection Manager (MCM)
• Manages radio interfaces and service interfaces calls
during HO
• MIH User providing mobile devices awareness to L2 and L3
mobility
results and conclusions
• 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)
Multicast
network
MN pDMAR nDMAR
HO trigger & preparation, resource query, target selection
HO completion
TCXT
MCXT.req
MCXT.ack
PIM Join
TJOIN
TOFFSET
Retrieve subscription list
MIH Link Up & service
interface update
Multicast
Multicast TDISRUPT
_CXT
TTOTAL
MLD Report
PIM Join
Multicast
TDISRUPT
NO_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
Delay factor
TJOIN
TTOTAL
TCXT
TDISRUPT_CXT
TOFFSET
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 Server
Network Backend
DMAR1
pDMAR nDMAR
Live streamer
(encoding & marking)
LTE
Receiver Receiver
Mobility
Fig 4 Evaluation scenario
INFOCOM, Toronto | April 2014 Contact Rui Aguiar | ruilaa@ua.pt