Date post: | 11-Jan-2016 |
Category: |
Documents |
Upload: | gerard-job-daniel |
View: | 236 times |
Download: | 3 times |
Cellular IP:A New Approach to Internet Host Mobility
Reporter :江俊毅
Outline
Cellular IP introduction Routing Protocol Paging Paging & Routing caches Handoff Conclusion
Introduction Mobility overview Macro-mobility
Mobile IP MIPV6 MIPV4
Micro-mobility Cellular IP HAWAII HIP
Cellular IP Cellular IP represents a new mobile host
protocol simple, and flexible protocol for highly mobile
hosts CIP supports local mobility & efficiently internet
works with Mobile IP
Wirelss access networks and mobile IP
Wireless Access network Model
MH
B
DInternet with
Mobile IP
R
R
A
CE
F
G
Home agent of MH
Gateway
Beacon signal
Packets will be first routed to the host's home agent and then tunneled to
the gateway
The gateway "detunnels'' packets and forwards them toward base stations
Packets transmitted by mobile hosts are first routed to the gateway and
from there on to the Internet
MOBILE IP
CELLULAR IP
Cellular IP Paging Idle mobile hosts that receive a packet move
from idle to active state, start their active-state-timer and immediately transmit a route-update packet.
This ensures that routing cache mappings are established quickly
Mobile host state machine
Efficient Location Management
Two parallel structures of mappings (PC &RC)1 - idle MH keeps PC upto-date2 - PC mappings used to find the loc of idle MH 3 - maintains RC mappings until actively connected4 - routing of data packets to MH
X XX
PC RC
Service Area
Mobile Host1 2 3 4
PAGING &ROUTING
Illustration of Paging
MHB
D
R
A
C
E
F
G
Internet withMobile IP
GW X
Paging-update packets create mappings in PCs
X : from GX : from C
Paging-update
I don’thave a PC
PCs updated for a moving host
X : from GX : from C
B
D
R
A
C
E
F
G
Internet withMobile IP
GW X
X : from F
X : from F,G
G times out
MH
No change in PC at A
X : from FX : from C
B
D
R
A
C
E
F
G
Internet withMobile IP
GW
MH X
Paging packets are routed to the mobile host by PCs
X
Handoff
X : from D
X : from D, E
X : from E
X : from C
E
B
D
R
A
C
F
G
Internet withMobile IP
GW X
X : from F
Paging & Routing caches
Handoff Cellular IP handoff
Hard handoff Semi-soft handoff
Hard handoff During the Handoff Latency the downlink
packets are lost. Semi-soft handoff
Improvement over Hard Handoff
Hard-Handoff
2.MN send Route Update Packet to GW
3.BSs are refresh RS
4.GW send data packets to MN
1.MN From Old BS toNew BS
Semi soft-Handoff Improvement over Hard Handoff ; NO packet
loss & smooth handoff. Need for buffering at the cross over point :For
smooth handoff
Compare Mobile IP & Cellular IP Location management
Mobile IP: Care-of-address Cellular IP: paging update packet
Routing Mobile IP: registration Cellular IP: routing cache
Handoff Mobile IP: encapsulation, triangle routing Cellular IP: routing cache
Conclusion Cellular IP represents a new approach to IP host
mobility Cheap passive connectivity using PC and
RC Flexible handoff The important issue :
Authentication and security
End
Thanks~