Transcript PPT Version

Benefits of multiple CoAs and HoAs
for low power multimode mobiles
<draft-tsao-mip-multihoming-lowpower-00.txt>
S. Charles Tsao
National Chiao Tung University
Multimode Mobile Node (MMN)
• MMN might have several wireless interfaces
accessing the Internet simultaneously
CN
All-IP Network
3G
WLAN AP
WiMAX BS
Bluetooth AP
Mobile Ad Hoc Network
MMN
Power Consumption Issue of MMN
• Power consumption posts a serious
problem of
PDA+GSM(idle)+WLAN(Off)
1.2
PDA+GSM(idle)+WLAN(PSM)
an MMN even some of the interfaces
are idle
PDA+GSM(idle)+WLAN(active)
PDA(Idle)+GSM(idle)+WLAN(Off)
WLAN
1
GSM/GPRS
0.748A
GSM+WLAN(CAM)
current (A)
0.8
0.6
0.411A
GSM+WLAN(PSM)
0.4
0.313A
GSM+WLAN(off)
0.17A
GSM only
0.2
0
2
Multi-mode Mobiles
2.5
3
time (sec)
3.5
4
To turn on WLAN(PSM) increases 30% energy consumption
To turn on WLAN(CAM) increases 138% energy consumption
Solutions for Low Power MMN
• Turn off wireless interface(s) (IF) if there
is no packet to send or to receive
– But lose IP connectivity
• Benefits of using multiple CoAs and HoAs
– Turn off IF(s) to save the power
– Still provide IP connectivity to these interfaces
that are switched off
Use Case Scenarios
• Use Case I
– Multiple IFs, Multiple HAs, Multiple HoAs,
Multiple CoAs
– Each IF is associated with an HoA and a CoA
• Use Case II
– Multiple IFs, Single HA, Single HoA, Multiple
CoAs
– Each IF is associated with a CoA
IF is associated with HoA/CoA
• Use one HoA as a CoA of the IF which is
Binding Cache@CN
switched off
HoA#2,
---
3. Inbound sessions
CN
All-IP Network
4. Tunneled to CoA#2(HoA#1)
Binding Cache@HA#1
HoA#1,
CoA#1
WLAN AP/HA#1
3G/HA#2
Binding Cache@HA#2
HoA#2,
CoA#2
HoA#2,
HoA#1
5. Tunneled to CoA#1
6. BU CN (CoA#1) or
Turn on IF#2, BU CN (CoA#2)
IF#1, CoA#1, HoA#1
2. Turn off IF#2
1. Use HoA#1 as CoA#2 to register to HA#2
MMN
IF#2, CoA#2, HoA#2
IF is associated with HoA/CoA
• Use one CoA as a CoA of the IF which is
Binding Cache@CN
switched off
HoA#2,
---
3. Inbound sessions
CN
All-IP Network
4. Tunneled to CoA#2 (CoA#1)
Binding Cache@HA#1
HoA#1,
CoA#1
WLAN AP/HA#1
3G/HA#2
5. BU CN (CoA#1) or
Turn on IF#2, BU CN (CoA#2)
IF#1, CoA#1, HoA#1
Binding Cache@HA#2
HoA#2,
CoA#2
HoA#2,
CoA#1
2. Turn off IF#2
1. Use CoA#1 as CoA#2 to register to HA#2
MMN
IF#2, CoA#2, HoA#2
IF is associated with CoA
• Register multiple CoAs to an HoA & set preferred
CoA(s)
Binding Cache@CN
HoA,
HoA,
4. Inbound sessions
CoA#1
CoA#2(*)
CN
Binding Cache@HA#1
HoA,
CoA#1
HoA,
CoA#2(*)
HA
All-IP Network
5.Tunneled to CoA#2
WLAN AP
3G
2. Use CoA#1 to register HA (preferred CoA#2)
3. Turn off IF#1
IF#1, CoA#1, HoA#1
6. BU CN (CoA#2) or
Turn on IF#1, BU CN (CoA#1)
1. Use CoA#2 to register HA
MMN
IF#2, CoA#2, HoA#1
Conclusions
• Benefits of using multiple CoAs and HoAs
for low power MMN
– Not yet discussed in “Goals and Benefits of
Multihoming”
– Should we cover these benefits and use cases
in the document?
Conclusions (Cont.)
• Two use case scenarios
– Each IF is associated with an HoA and a CoA
• Use one HoA or CoA as CoA(s) of the IFs which
are switched off
– Already in “Analysis of Multihoming in Mobile IPv6”
– Should we add more text to describe these situations ?
– Each IF is associated with a CoA
• Register multiple CoAs to an HoA
– Already in “Analysis of Multihoming in Mobile IPv6”
• Set preferred CoA(s)
– Already in “Analysis of Multihoming in Mobile IPv6”
– Should we add more text to describe these situations ?
We appreciate for your comments