Transcript GISFI_IoT_20110695

Mobility Management Requirements for
NGN
Ashutosh Dutta
NIKSUN
Princeton
New Jersey, 08540
Prepared for GISFI #5 IOT - Hyderabad
Contact: [email protected]
IOT5-20110014
GSIFI #5, June 20 – 22, Hyderabad,
India
1
What are Characteristics of Next
Generation Networks?
• Heterogeneous networks, many access networks
– Access-independent converged IP network
• Order-of-magnitude increases in bandwidth
– MIMO, smart antennas
– Increase in video and other high bandwidth traffic
• New terminals
• New services and service enabling platforms
• Large range of cell sizes, coverage areas
– PAN, LAN, WAN
– Pico-cellular, micro-cellular, cellular
• Changes in traffic and traffic patterns
– Rise in video on demand? Requires good high-bandwidth multicast
IOT5-20110014
GSIFI #5
Mobile Wireless Internet: A Scenario
Domain1
Internet
Domain2
PSTN gateway
WAN
802.11a/b/g
UMTS/
CDMA
WAN
802.11 a/b/g
Bluetooth
IPv6
Network
LAN
PSTN
Hotspot
LAN
PAN
Roaming
User
IOT5-20110014
CH
UMTS/CDMA
Network
GSIFI #5
Ad Hoc
Network
Case Study I - Mobility Illustration in a sample IP-based network
Administrative
Domain A
Administrative
Domain B
Authorization
Agent
Registration
Agent
Authorization
Agent
Authentication
Agent
Authentication
Agent
Configuration
Agent
Signaling
Proxy
N1
Registration
Agent
Configuration
Agent
N2
N1
Backbone
IPch
Signaling
Proxy
Corresponding
Host
Layer 2
PoA
L3 PoA
207.3.232.10
A
L2 PoA
L3 PoA
Layer 3
PoA
N2
128.59.11.8
L2 PoA
B
C
D
L3 PoA
128.59.10.7
Mobile
Host
N1- Network 1 (802.11)
N2- Network 2 ( CDMA/GPRS)
Layer 2
PoA
207.3.232.10
802.11
802.11
210.5.240.10
128.59.9.6
802.11
h/o delay
18 s
Handoff Delay
~ 18 s
802.11
CDMA
18 Seconds media interruption
GSIFI #5
802.11
900 ms
media interruption
h/o delay
900 ms
4
4 Seconds media interruption
h/o delay 4 s
Case Study II - P-CSCF Fast-handoff Experimental
Results
Components Optimized
Types of Handoff
Non-Optimized
Reactive
Proactive
0
3000
6000 9000 12000
Time in ms
PPP Termination
Layer 2 Delay
PPP Activation
MIP-Solicitation
MIP-Binding Update
DHCP Trigger
DHCP Inform
SIP Trigger
SIP+Security
Media Redirection
Components Optimized
Figure 1: Levels of MMD Optimization
IOT5-20110014
GSIFI #5
5
Motivation
• It is desirable to limit the jitter, delay and packet
loss for VoIP and Streaming traffic
– 150 ms end-to-end delay for interactive traffic such as
VoIP, 2% packet loss is allowed
• Delay due to handoff takes place at several layers
–
–
–
–
–
Layer 2 (handoff between AP),
Layer 3 (IP address acquisition, Configuration)
Authentication, Authorization
Binding Update
Media Redirection
• Rapid handoff will contribute to overall delay and
packet loss
• Thus, it is essential to reduce the handoff delay
introduced at different layers to provide better
QoE to end users
IOT5-20110014
GSIFI #5
Objective
• Develop Best Current Practices for Mobility
Management in NGN
– Applicable to Rural Environment
• Develop general rules of optimization for
several handoff functions
IOT5-20110014
.
GSIFI #5
7
Technical issues for mobility management
Key Functions
Characteristics
Handoff
• May take place between cell, subnet or domain
• Need to optimize the handoff delay and transient data loss ( e.g., end-todelay up to 200 ms, 3%-5% packet loss, jitter, for real-time VoIP traffic)
• May use soft-handoff feature of CDMA, but need fast-handoff mechanisms
for other technologies (e.g., 802.11)
• Need to support session based applications for TCP and RTP traffic
Configuration
•Should be configured within few milliseconds
•Configures IP address and other server parameters (e.g, DNS, SIP
server, Gateway)
Registration
• Assist pre-session mobility
• Hierarchical nature will make the registration faster
• Helps location management functionality
Quality of
Service
•Need to maintain same QoS during its subnet/domain movement
Location
Management
•Allow user to maintain same URI irrespective of point of attachment
IOT5-20110014
Mobility Taxonomy
IP Mobility
Personal
Terminal
Service
Session
Issues
• Mobility pattern
NetworkTransport
Layer Layer
MIPv4
Cellular IP
HAWAII MSOCKS,
IDMP
Migrate
MIP-LR
mSCTP
MIPV6
ProxyMIPv6
IOT5-20110014
Application
Layer
• Systems
Optimization
Shim
Layer
HIP
SIPMM
MIP-LR(M)
Proxy
GSIFI #5
• Host controlled
vs.
Mobile Controlled
Framework Requirements for Mobility Management
• It supports means of personal, service, and terminal mobility
• It supports global roaming (e.g., Inter-operator roaming)
• It is wireless "technology-independent”
– CDMA, WiFi, LTE
• It supports single interface and multi-interface mobility
• It supports both real-time and non-real-time multimedia services
– mobile telephony, mobile web access, and mobile data services
• It allows a mobile station/user to maintain privacy and confidentiality
• It supports multicast and anycast trees efficiently as mobile stations/users
move around
– IPv6, IPTV
• It provides Secure Signaling for the mobile users
• It interworks smoothly with PSTN and today's 1G/2G wireless telephony to
facilitate interworking of new operators' all IP platforms
IOT5-20110014
GSIFI #5
• Handoff
Mobility Functions
–
–
–
–
Need to support Cell, Subnet and Domain
Need to support Hard handoff, Soft Handoff
Ensure the integrity, privacy and confidentiality of user’s information
All three hand-off processes ensure service mobility
• Maintain QoS of the ongoing sessions
• Ensure that the mobile has access to all of its subscribed network
services and features
– Domain hand-off latency should include AAA interaction
– Domain handoff should not exceed MAHT to ensure continuity of realtime sessions
– Need to support both TCP and RTP/UDP protocols
• Registration
– Supports complete registration for domain handoff - AAA
– Supports partial registration for subnet handoff
– Supports hierarchical registration when the user is far away
IOT5-20110014
GSIFI #5
Mobility Functions (contd.)
• Configuration
– Should not take more than a few hundred milliseconds
– Should update DNS to reflect the current address to
name mapping (Dynamic DNS)
• Dynamic Address Binding
– Allows a user to maintain a universal identifier (e.g.,
SIP URI) regardless of its point of attachment to the
network
• Location Management
– Should be accurate, up-to-date
– Should only be disclosed to authorized users and
relevant users
IOT5-20110014
GSIFI #5
Mobility Optimization
• Use of cross layer triggers to expedite handoff
operations
– Layer 2 assisted fast-handoff
• Policy-based mobility management
– Use the optimized protocol suitable for a specific
application
• SIP for real-time, MIP for Non-real-time
• Pre-authentication, Pre-configuration to reduce
the handoff time
• Parallelize among handoff functions
– Layer 3 discovery while doing layer 2 discovery
• Proactive Discovery of Networks
– IEEE 802.21
IOT5-20110014
GSIFI #5
Next Steps
• Deployment case studies with mobility
protocols (e.g., Network layer, application
layer)
• Best Current Practices for mobility
optimization
• Familiarize with other SDOs (e.g., IETF)
IOT5-20110014
14
.
System decomposition of mobility event
Mobility
Event
P1
P2
Network
discovery &
selection
P11
Channel
discover
y
P3
Network
attachment
Configuration
P12
P21
P23
association
P13
Server
discovery
IOT5-20110014
P5
Security
association
P6
Media
reroute
Binding
update
P31
Subnet
discovery
L2
P4
Identifier
acquisition
Domain
Advertisement
P22
Router
solicitation
P33
Address
Resolution
P32
Duplicate
Address
Detection
P41
P53
Authentication
(L2 and L3)
P42
P51
Key
derivation
Identifier
mapping
Identifier
update
P62
P61
Tunneling
P54
Binding
cache
Forwarding
P63
Buffering
P64
P52
Identifier
Verification
Bi-casting/
Multicasting
15
IEEE 802.21 and MP Enabled Seamless Mobility Deployment Scenario
Use Case: Cross layer and multiple interfaces
Zone 2
Zone 1
Ne S B
tw SI S
or D/ SI
k
C D
Connect
to
Ty ell
WLAN
pe ID
Zone 4
Op
er
at
or
Wakeup
Se N WLAN
C Q
cu
rit
y
W
ha o
nn S
el
Wi-Fi
2.1
Dat
a
Rat
e
Zone 5
Shutdown
GPS
Café
Start
Download
GS 13 N/
AT NA
NA
M WLAN
98 Switch
A
&T to WiMAX
over
9
Download over
WiMAX
Shutdown WLAN
N
TPK EAPZone807 N Wakeup
Wi-MAX
GPS
6d
Network
Type
Ph
ysi
cal
La
yer
N/A
Wi-Fi
Airport
WLAN Link Going
Down.
1 N
9 /
0 A
0
Zone 3
Wakeup WLAN
Download over
WLAN
Shutdown GPS
GSM
GSM
GSM
WLAN
WLAN
WLAN
9.6
kbps
Battery
level low
Shutdown WiMAX
Download over
GSM/GPRS
1 Y Zone
OF 8 40
A
A
Mo
M
PEA 1 e DM
Mbp
s
s
SSID/ bileBSSID POperator
Security
Security
Cell ID
Zone 6
RadioState
Radio
Radio
State
State
WiMAX
WiMAX
WiMAX
GPS
GPS
GPS
Wi-MAX
Zone 9
NW
EAP
Type
Channel
Channel
QoS
Physical
Layer
Data Rate
GSM
13989
N/A
AT&T
NA
NA
NA
NA
1900
1900
N/A
N/A
kbps
9.6 Kbps
802.11b
Café
Airport
00:00:…
Café
Airport
.11i
.11i
EAPEAPPEAP
PEAP
6
.11e
OFDM
11 Mbps
Courtesy: IEEE 802.21 chair
Personal Mobility: Registration
[email protected]
registrar
CH
IP-based
Network
Subnet 2
Subnet 1
[email protected]
registrar
•
•
When lady in red moves, she
– leaves her laptop behind
– Uses another machine
– Logs in
User registration performed
IOT5-20110014
CH
Subnet 1
IP-based
Network
Subnet 2
Personal Mobility: simultaneous registration of
multiple bindings
[email protected]
Registrar [email protected]
& proxy
CH
IP-based
Network
Subnet 2
[email protected]
[email protected]
Registrar
& proxy
Subnet 1
• When lady in red moves, she
– leaves her laptop behind
– Uses another machine
• She can still be located
IOT5-20110014
CH
Subnet 1
IP-based
Network
Subnet 2
Session Mobility
INVITE
CH
2
Subnet 2
IP-based
Network
3
Subnet 1
1
MH
CH
Subnet 1
IOT5-20110014
IP-based
Network
Subnet 2
Service Mobility
• Service Mobility allows a roaming user to get the same view of
the network as when he is at home
• At the time of registration
–User’s service profile is retrieved from the home network
–The service profile is shared with the responsible entity at
home and in the foreign network (wholly or partially)
• The foreign network provides some of the service required
• The home network still retains responsibility for other services
• Examples of entries in the profile of interest may be address
book, call handling features, buddy lists, etc.
IOT5-20110014