Transcript Title: Architecture, Mobility Management and Performance Issues for Wireless Internet

Title: Architecture, Mobility Management and
Performance Issues for Wireless Internet
Telephony and Multicast Streaming
Thesis Proposal by: Ashutosh Dutta
[email protected]
Thesis Advisor: Prof. Henning Schulzrinne
Outline
 Motivation & Problem Statement
 Related Work
 Initial Results
 Future Work with timeline
 Conclusions/Discussions
 Video Demo (if time permits)
Thesis Proposal - 2
Mobile Wireless Internet: A Scenario
Domain1
Internet
Domain2
PSTN gateway
WAN
802.11a/b/g
WAN
UMTS/
CDMA
IPv6
Network
802.11 a/b/g
Bluetooth
LAN
PSTN
Hotspot
LAN
PAN
Roaming
User
CH
UMTS/CDMA
Network
Ad Hoc
Network
Thesis Proposal - 3
Proposed area of work
IP Mobility
Personal
Terminal (*)
NetworkTransport Application
Layer Layer
Layer
MSOCKS,
Migrate
mSCTP
Session
Mid-session
Pre-session
MIP
CIP
HAWAII
IDMP (*)
MIP-LR
MIPV6
Service
SIPMM (*)
MIP-LR(M)*
Multicast
Optimized FastHandoff (*)
Overlay
Network
Layer
MarconiNet
Mobicast, MSA, MMA
Thesis Proposal - 4
Motivation and Problem Statement
 Motivation
– Current mobility management mechanisms suffer from wide scale deployment
bottleneck due to performance issues such as triangular routing, encapsulation and lack
of transition abilities between diverse networks
– Provide session-based applications such as IP telephony and multimedia streaming
services anytime, anywhere in a most optimized, secured manner
– Need to minimize packet loss and handoff latency during subnet and domain movement
 200 ms maximum tolerable jitter for real-time application, 3% packet loss
 Design, demonstrate and analyze an optimized application layer mobility
management scheme for wireless Internet telephony
–
–
–
–
–
Application layer terminal mobility for wireless Internet roaming (Cell, Subnet, Domain movement)
 Interaction with Registration, Configuration, Security, QoS, VPN, heterogeneous access, IPv6
Policy-based mobility management for survivable networks
Fast-handoff Mechanisms to reduce transient data loss and handoff delay
 Layer 3
 Application Layer
 Proactive handoff
Performance evaluation of application layer terminal mobility with MIPv4,MIPv6, IDMP
Proof-of-concept in a wireless Internet telephony testbed
 Design, demonstrate and analyze a multicast mobile content distribution
– Hierarchical scope-based multicast architecture
– Flexible content distribution (global content and local content) with application layer
triggering
– Fast-handoff mechanism for Intra-domain IP multicast stream
– Performance evaluation of Fast-handoff Mechanism
– QoS guarantee to the mobile users in a multi-subneted environment
– Proof-of-concept in a Multimedia testbed
Thesis Proposal - 5
Handoff Latency For Terminal Mobility
MN
AP1
DHCP server/
PPP
/FA
AP2 Access
HA/SIP Server
Router
1- L2 Hand-over Latency Delay
CN
Binds to AP1
2 – Delay due to
IP Address Acquisition and
Configuration
3 - Registration and
Media Redirection delay
Media
1
3
Binds to AP2
ICMP Router Discovery/Router Advertisement

2

2
DHCP/ MIP CoA/PPP
Stateless Auto-configuration
1
DAD/ARP
MIP/SIP Registration/Re-Invite
3
IGMP/RTCP
AAA
Method
Linux
DHCP
ARP w/o
Time
2
4-5 300
150 ms
400
s
ms
DRCP
New Media/
Traffic Resumption
DHCP (v6)
160
ms
500
ms
Auto
IP
L2 1
802.11
CDMA
1
Static
PPP
FA
COA
Pro
active
7-8
s
1–2
s
4-5
s
100 ms
27 ms
100 ms
TBD
Thesis Proposal - 6
Sample Mobility Protocols under study
Dynamic
DNS
Home Network
Register
HA
data
New Data
Home
SIP
Network
Server
Registers
CH
Tunnelled data
CH
Existing
Session
FA
Re-INVITE
DHCP
data
moves
MN
Plain Mobile IPv4
1. MN moves
2. MN re-invites
3. SIP OK
4. Data
SIP
Server
MN
MN
Foreign Network
SIP Mid-session mobility
Home Network: a.b.c
LR
LR
2: Query
4: Binding
cache (COA)
3: COA
R
CH
Foreign
Network 1:
j.k.l
5:Un-Encapsulated
data packets sent
directly to COA
Foreign
Network
2 p.q.r
1: Registration: MH:
COA=j.k.l.m
a.b.c.d
Application Layer MIP-LR
Mobile IPv6
Thesis Proposal - 7
Application layer terminal mobility for wireless Internet
roaming
• Original SIP-based terminal mobility (Wedlund, Schulzrinne, 1999 WoWMOM)
• Contribution here: Enhance SIPMM with Configuration, Registration, TCP, IPv6,
fast-handoff, Mobility (Cell, subnet, Domain), QoS, Dynamic DNS, VPN, AAA,
Heterogeneous Access)
Public AAA
Home Domain
Visited
Domain
AAA
Visited Registrar
VR
Public
SIP Server
AAA
QoS
Home
QoS
HR Registrar
SLA/SA
SIP Server
SIP Server
Corresponding Host
DHCP/PPP
DHCP/PPP
DNS
PANA
PANA
N1
BS
ERC
128.59.11.6
BS
D
128.59.10.6
Interne
t
DNS
N2
N1
IPch
ERC
AP
ERC
N2
207.3.240.10
N1- Network 1 (802.11)
AP
N2- Network 2 ( CDMA/GPRS)
ERC - Edge Router and Controller
207.3.232.10
SIP
A enabled
MN
AP
B
207.3.232.10
C
Thesis Proposal - 8
Comparison of MIP with application layer mobility
protocols (SIP, MIP-LR)
SIP vs. MIP Latency (Experiment)
MIP Latency
SIP Latency
SIP-MIP Latency Simulation
35
35
Latency in msec
30
Latency in msec
40
30
25
20
25
15
10
SIP
MIP
20
5
15
0
0
100 200 300 400 500 600 700 800 900 1000
10
Packet size in bytes
5
0
100 200 300 400 500 600 700 800 90010001100
Fig 1 a. Comparison of MIP and SIP-based mobility
Packet Size in bytes
Ping, CH->MH@Foreign, Payload=64B:
Ping, CH->MH@Foreign, Payload=1024B:
MIP-LR outperforms MIP when the triangle is long
90.00
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
120.00
100.00
MIP
MIP-LR
RTT (ms)
RTT (ms)
MIP-LR outperforms MIP when the triangle is long
80.00
MIP
60.00
MIP-LR
40.00
20.00
0.00
0
10
20
30
40
Delay1 (ms)
0
10
20
30
40
Delay1 (ms)
Fig 1 b. Comparison of MIP and MIP-LR application layer
Thesis Proposal - 9
SIP-based Subnet and Domain Mobility (Experiment)
A specific handoff case with timing
CH
Old IP address
IP1
RTP to IP1
Voice
40 msec
time interval
CH
MH
X
RTP to IP1
Handoff
MH
RTP1
Time
Sec
RTP1
59.521 - 10.1.4.162
00.478
(L2+DRCP+PANA)
RTP2
X
Re-Invite
address IP2
OK
Pr
00.652
New IP
Pr
ACK
Pr
00.701
00.759 - 10.1.1.130
00.938
RTP2
RTP to IP2
00.949
Fig 1. Handoff Factors for SIP-based mobility
PANA
Operation
DRCP
PANA
SIP
00.960
01.031
Media
RTP
(De-REG+REG) (01.049, 01.052)
Subnet
Handoff
79 ms
Domain
Handoff
81 ms
2 ms
45 ms
228
ms
1490
ms
289
ms
1656
ms
Pr
OK
01.151
ACK
Pr
Pr = 220 ms
01.37
RTP1
01.52 – 10.1.1.130
Thesis Proposal - 10
Inter-domain secured handoff using SIPMIP
MIP-based secured interdomain mobility
6
6
5
5
RTP
SIP
4
RTP
3
DRCP
PANA
2
IPSEC
Protocol
Protocols
SIP-based secured interdomain mobility
4
DRCP
3
PANA
2
IPSEC
MIP
1
0
1
0
10 20 30
40 50 60 70 80 90 100 110 120 130 140
0
0
20
40
60
80
100
120
140
160
180
Seconds
200
Time in Seconds
MH
CH
207.3.232.156
CH
RTP1
RTP1
Time
Sec
MH
RTP1
RTP1
51.756 – 10.1.4.162 (domain1)
RTP2
VER
DISCO
DRCP
52.066
52.146
TIME
(Sec)
RTP2
ISCOV
DRCP D
DRCP OFFER
ER
DRCP OFFER
52.176
ACK
DRCP ACK
52.226
52.266 – 10.1.1.130 (domain2)
PANA
IKE
ITE
ReINV
24.216
24.246
Pr
IKE
52.796
Pr = 110 ms
52.906
ACK
24.156
24.176
24.196 – 10.1.1.130
PANA-AAA
52.276
52.346
52.666
OK
Pr
23.806 – 10.1.4.162
24.046
24.086
28.256
29.356
Mobile IP
RTP1
53.066 – 10.1.1.130
56.456
RTP1
29.376
RTP1 (IPIP)
31.186 – 10.1.1.130
IKE
56.926
Fig 3a. SIP-based secured Inter-domain mobility
Fig 3b. MIP-based secured Inter-domain mobility
Thesis Proposal - 11
Fast-handoff across heterogeneous access
network
RTP Sequence numbers
Packet Sequence Number
(500 packets/grid)
802.11-Cellular Secured Handoff
2600
2500
802.11
2400
Out-of-order
Packets
80211-cellular
2300
2200
Low
gradient
2100
2000
57:07.2
57:50.4
3G Cellular
802.11b
802-11Cellular
handoff
Cellular
58:33.6
59:16.8
Time in Minutes
Operation
Timing
PPP setup
10 sec
802.11b –
Cellular
X-MIP
300 ms
Time (10 seconds/grid)
Movement type
Cellular802.11b
Handoff
Trials
#1
#2
#1
#2
VPN Tunnel
setup
6 Sec
INVITE -> OK
0.12 s
0.12 s
1.32 s
6.64 s
I-MIP
400 ms
I-MIP (Home)
200 ms
INVITE ->
1st Packet
0.39 s
0.41 s
2.54 s
7.18 s
IPSEC
60 ms
Re-transmission
None
None
Yes
Yes
DHCP
3 Sec
Transmission
Delay
5 ms
802.11
2.5 s
cellular
Fig 2a. SIP-based multi-interface mobility management
Fig 2b. Mobile IP with VPN
Thesis Proposal - 12
SIP-based handoff analysis for IPv6 and
MIPv6 (experiment)
Handoff Delay Table
detachment from
old access medium
New
Router
MN
CN
Signaling (ms)
HANDOFF
CASE
attachment to
new access medium
SIP
(DAD)
D1
DAD
D3
38290 171.4
Router
Advertisement
Re-INVITE
handoff completion
(signaling)
MIPv6
SIP
MIPv6 SIP SIP
NDAD
NDAD
NDAD NDAD DAD
H12
D2
handoff
detection
Media (ms)
H23
3932
1.5
161.6 2.0
38546 420.8 21.1
4187.7 418.6 30.3
200 OK
ACK
H31
1934.7 161.1 1.0
1949.4 408.4 25.3
Delay on Media
UDP packet
handoff completion
(media)
Handoff Flow
Key Findings: SIP Mobility and MIPv6 have a lot of similarities in terms of binding update
and triangular routing avoidance and could be interesting candidates for performance
comparison
Thesis Proposal - 13
Application layer mobility for TCP traffic (Mobility Proxy)
CH
Libipq+
Mangler
Approach 2
Approach 1
1. Existing
TCP connection
3. Re-Invite
/ MIPLR update
New TCP
connection
SIP
Registrar
4. New TCP
connection
Mobility
Proxy
SIP-CGI
4. Forward packets
to the new
IP address
Libipq+
De-Mangler
3. Update IP address
IP1
IP2
Mobile Host with
Old IP address
2. Change to a new IP address
Mobile Host with
New IP address
Thesis Proposal - 14
Policy-based mobility management
SIP-MMP Integration Flow
CH
Interdomain
Network
LR
Subnetwork
Gateway 1
SIP UA
MMP
Gateway
MH
MH
Domain 2
MH
move
s
IP1
Check domain
and IP address
both
e
Re-Invit
Subnetwork
Subnetwork
MH
wit Mov
hin
e
GW s aga
in
2
RTP session
Subnetwork
Gate
way
B
MMP Node
IP1
eaco
n
MMP
Access Point
Access Point
MH
IRR
Router
Subnetwork
Gateway 2
RTP session IP0
MMP
gateway’
DRCP/SIP
server
LR
Router
CH
Domain 1
IP address
does not change
e
Updat
Cache
SIP/MIP-LR
RTP session
Mobile host
SIP/MIP-LR
SIP UA/MIP-LR/MMP
SIP-MIPLR Flow Diagram
Domain 1
Gateway 1
CH
MIPLR-MMP
Domain 2
MH
Gateway 2
MH
Gateway 1
Multimedia
Session
MH
CH
HLR
Gateway 2
IP0
FA
MH
FA
MH
IRR
Query
TCP session IP0
Domain1
Domain2
MH
TCP Session
IP1 (New Domain/New IP address)
e
Re-Invit
1. Check Policy
Table
2. Mangle only
TCP packets
LR
MIP te
upda
TCP S
e
ssion
E
UPDAT
E
UPDAT
Libipq+
Mangler
Demangler
RTP Session
TCP session
move
s
IP1
Check domain
and IP address
both
MH
wit Mov
hin
e
GW s aga
in
2
Gatew
ay
Demangler+
libipq
IP1
Beacon
Cache
Initialization
IP address
does not change
TCP session
Thesis Proposal - 15
Policy-based mobility management
performance (experiment)
(a) duplicate packets arriving at MH during micro-mobility handoff;
(b) packets dropped during macro-mobility handoff
Thesis Proposal - 16
Why SIP Fast-handoff ?
CN
Home
Domain
Home SIP
Proxy
Public SIP Proxy
Public SIP Proxy
RTP
Media
(Existing SIP
Session)
Public SIP Proxy
Internet
5
RTP
Media after
Re-Invite
OK ACK
Visited Domain
Visited
Proxy
3
2
IP0
Translator
Subnet
MN S0
Register
1
4
Translator
IP2 Subnet
MN S2
IP1 Translator
MN Subnet
S1
Thesis Proposal - 17
SIP fast-handoff mechanisms
Key Design Techniques:
– Limit the signaling due to Intra-domain Mobility
– Capture the transient packets in-flight and redirects to the
mobile
 SIP Registrar and Mobility Proxy-based
– RTPtrans (RTP translator an application layer Translator)
– Mobility Proxy uses NAT tables
– Experimented in the lab environment
 Outbound SIP proxy server and mobility proxy
– Local SIP proxy captures outbound packets
 B2BUA and midcom
– Operator assisted fast-handoff
 Multicast Agent
– Small group multicast
– Duration limited locally scoped Multicast
Thesis Proposal - 18
Intra-domain SIP fast-handoff mechanism –
mobility proxy
Domain -D1
Mapping Database
IP2 -> IPR1
IP3 -> IPR2
.
.
.
RT1,RT2,RT3 - RTP Translators
Delay
Simulator
2a Re-Invite
SIP
Server/
Registrar
R
CH
1
3
Register
2’
IPR3
IPR2
RT3
RT2
IPR1
4
IP2:p1 RT1 IP1:p1
4’
MH
MH
MH
IP3
IP2
IP1
Thesis Proposal - 19
Proactive handoff protocol flow
MN
IP0
Location
Server
Peer
NAR
PAR
MN
AP1
AP2
AAA DHCP
CH
DISCOVER
Network Elements
Neighboring networks
Existing Session
PANA
Authentication
IKEv2
DHCP proxy
IKEv2 with IP address from network 2
Binding Update with IP1
Tunneled data
Detects
New
Network
Old
IPSEC
Tunnel
Breaks
DHCP
INFORM
IP1
Network A
New Data
Network B
Network C
Thesis Proposal - 20
MarconiNet Logical Architecture
Global Content Providers
PS1
PSi
PS2
(Encrypted
Audio Stream)
Mi
M2
M1
SAP Mx
Local Station Program Manager
Channel Monitor
SAP Based announcement
GLOBAL (encrypted)
Mi
RTP/RTCP
Local station
Primary Station Announcer
Channel Monitor
Channel Database
Program
Manager
SETUP
PLAY
Channel
announcement
(local)
SAP lmx
mi
lmi
IP Radio/TV Tuner
MarconiNet Prototype
RTSP Ad/
Media
Server
Local
Commercial
RTP/RTCP
lml (local program)
SAP/SDP
Mobile
Clients
Thesis Proposal - 21
Protocol Flow for MarconiNet
Content
Local
Server
Maddr
Server
Media
Server
lml
IMR
Fetch Maddr Mi
Start
Global
Program
Global
Bus
Announce (SAP/SDP)
Local Program (SAP)
Mi
Local
Bus
lmi
Local Channel DB
Client tunes
External event
triggers
Local Content
Media
Delivery
Live media
Ad delivery
RTCP BYE
Client changes
channel
Thesis Proposal - 22
Mobility and QoS with multiple servers
Sources
p1
S1
S2
p2
M-Proxy
Backbone
S1
m1
S0
Local
Server
• Fast-handoff for the
mobiles
• QoS negotiation
m1
m2
Local
Server
RTSP
Local
Program
Ad server
m2
RTSP
Ad server
(a1,a2)
Local
Program
(a3)
BS0
(P1,a1)
(P2,a2)
BS1
BS2
P2,a3
P2,a2
Thesis Proposal - 23
Fast-handoff mechanism for MarconiNet
 Layer two handoff
–CGMP, IGMP snooping
 Post Registration
–Address Acquisition (DHCP/DRCP)
–IGMP Triggering (Layer 3)
–RTCP Join/Leave (Application Layer)
 Pre-registration
–RTCP triggering with pre-provisioned shared multicast
address
–Time bound pro-active multicast using multicast agent
–Deploy proxy agents in each subnet
 During registration
–Pass on the local multicast address as part of DHCP
DISCOVER message
Thesis Proposal - 24
IGMP Join/Leave latency vs. Proxy-based handoff in
802.11 environment
Proxy based handoff
5
5
4
RTP
3
Subnet
handoff
DRCP
Subnet
handoff
Router Query
2
Q.Response
1
JOIN Latency
0
Ping-Pong
Ping-Pong
Protocols at Mobile
Protocols Instance at Mobile
IGMP-802.11 (Subnet) Handoff
4
RTP
3
Router Query
2
Q.Response
1
0
JOIN Latency
0
0
200
400
600
800
DRCP
Handoff
1000
TIme in Seconds
JOIN Latency is about 60 seconds
Maximum LEAVE latency is about 3 min
200
400
600
800
Time in Seconds
JOIN latency is almost zero
Leave latency is still an issue ?
Thesis Proposal - 25
Roadmap for future work
 Develop analytical models for the following cases
–
–
–
–
SIP-based mobility and MIPv6 – February 2005
SIP-based fast handoff, IDMP Fast-handoff, MIP Fast-handoff – August 2005
Application layer mobility for simultaneous movement) – July 2005
RTCP and IGMP-based Triggering mechanism to study join/leave latency – April 2005
 Secured proactive fast-handoff mechanism
– Complete the Fast-Handoff scheme using proactive IP address acquisition and preauthentication
– Expected Completion date April 2005
 Experiment fast-handoff mechanisms for MarconiNet under 802.11
environment
– Compare three fast-handoff mechanisms
– Reduce the “LEAVE” latency in 802.11 environment using Proxy-based approach
– Expected completion date September 2005
 Compare SIP-based terminal mobility for session-based TCP
application with other mobility approaches
– Expected Completion Date June 2005
 QoS mechanisms for mobile users in MarconiNet
– Use extension of RTCP and SAP protocols to provide guaranteed QoS to the mobile
– Perform extensive measurement under variable network condition
– Expected completion date is October 2005
Thesis Proposal - 26
List of Relevant Publications
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
A. Dutta, H. Schulzrinne, Y. Yemini, "MarconiNet: An Architecture for Internet Radio and TV. 9th International
Workshop on Network Support for Digital Audio Video Systems (NOSSDAV 99), New Jersey, 23-25th June.
A. Dutta, H. Schulzrinne MarconiNet:Overlay Mobile Content Distribution Network, IEEE Communication Magazine
February 2004
A. Dutta, F. Vakil, J.C Chen, M. Tauil, S. Baba and H. Schulzrinne, "Application Layer Mobility Management Scheme
for Wireless Internet," in 3Gwireless 2001,(San Francisco), pp. 7, May 2001
A. Dutta, P. Agrawal, S. Das, A. McAuley, D. Famolari, H. Schulzrinne et al Realizing Mobile Wireless Internet
Telephony and Streaming Multimedia Testbed Accepted Elsevier Journal for Computer and Communication
A. Dutta, O. Altintas, W. Chen, H. Schulzrinne Mobility Approaches for All IP Wireless Networks, SCI 2002, Orlando,
Florida
A. Dutta, H. Schulzrinne, S. Das, A. McAuley, W. Chen, Onur Altintas MarconiNet supporting Streaming Media over
Localized Wireless Multicast, M-Commerce 2002 Workshop, Atlanta September 28th, 2002
A. Misra, S. Das, A. Dutta, A. McAuley and S.K. Das, IDMP based\ Fast-handoff and Paging in IP based 4G Mobile
Networks," IEEE Communication Magazine, March 2002.
S. Das, A. Dutta, A. McAuley, A. Misra and S.K. Das, IDMP: An Intra-Domain Mobility Management Protocol for Next
Generation, Wireless Networks, to appear in IEEE PCS magazine
A. Dutta, O. Altintas, H. Schulzrinne, W. Chen Multimedia SIP sessions in a Mobile Heterogeneous Access
Environment, 3G Wireless 2002
A. Dutta, D. Wong, J. Burns, R. Jain, H. Schulzrinne, A. McAuley Realization of Integrated Mobility Management for
Ad-Hoc Networks, MILCOM 2002
J. Chennikara, W. Chen, A. Dutta, O. Altintas Application Layer Multicast for Mobile Users in Diverse Networks,
Globecom 2002
N. Nakajima, A. Dutta, S. Das, H. Schulzrinne Handoff Delay Analysis for SIP Mobility in IPv6 Testbed, Accepted for
for ICC 2003
Ping-yu Hsieh, A. Dutta, H. Schulzrinne Application Layer Mobility Proxy for Real-time communication 3G Wireless
2003
K. D. Wong, A. Dutta, K. Young, H. Schulzrinne Managing Simultaneous Mobility of IP Hosts, MILCOM 2003, Boston
A. Dutta, J. Chennikara, W. Chen, O. Altintas, H. Schulzrinne Multicasting streaming media to mobile users, IEEE
Communication Magazine, October 2003 Issue
K. D.Wong, A. Dutta, J. Burns, R. Jain, K. Young, H. Schulzrinne A multilayered mobility management scheme for
autoconfigured wireless networks, IEEE Wireless Communication, October 2003 Issue
A. Dutta, S. Das, P. Li, A. McAuley, Y. Ohba, S. Baba, H. Schulzrinne Secured Mobile Multimedia Communication for
Wireless Internet, ICNSC 2004, Taipei, Taiwan
K. D. Wong, Hung-Yu Wei, A. Dutta, K. Young, H. Schulzrinne "Performance of IP Micro-Mobility Management
Scehemes using Host Based Routing.", WPMC 01
A. Dutta, S. Madhani, W. Chen, O. Altintas, H. Schulzrinne Fast-handoff Schemes for Application Layer Mobility
Management, PIMRC 2004, Spain
Thesis Proposal - 27
Summary and Conclusions
 Initial work has focused in the following areas
– SIP-based Mobility Management for Wireless Internet




Terminal Mobility for RTP, TCP traffic for subnet and domain
IPv6
Heterogeneous Access
Fast-handoff Approaches (Layer 3 and Layer 4)
– MarconiNet: Hierarchical Multicast-based Content Distribution
 Streaming prototype with basic features of content distribution
– Localized Advertisement, Secured Payment, Channel Monitor
 Fast-handoff mechanism under MarconiNet environment
 QoS management for the mobiles
 Future work will focus on the following aspects
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Enhancement of the current prototypes
Develop Analytical models for fast-handoff mechanisms
Comparison of SIP-based mobility management with MIPv6
More Experimental results
Thesis Proposal - 28