A Handoff Architecture with Relay Agent in Nested Mobile Networks

1
A Handoff Architecture with Relay Agent in Nested
Mobile Networks

• 1Jae Kul Lee, 2Choong Seon Hong
• 1,2 School of Electronics and Information, Kyung
  Hee University Korea 449-701
• jaekul75_at_networking.kyunghee.ac.kr,
  cshong_at_khu.ac.kr

2
Introduction

• The evolution of information technology has
  enabled a mobile object such as person, car, bus,
  train, airplane, or ship to carry a plethora of
  information device
• Although Mobile IPv6 can be considered as a
  solution for the problem, it does not support in
  the situation
• Routing is inefficient in nested mobile networks
  with several subnets
• This paper proposes an architecture and element
  to support packet routing for mobile networks

3
Packet Format of the Binding Update
Table 1. Binding update option format
Table 2. MONET prefix sub-option
4
Operation of main components

• Correspondent node operation
• Checks validity of binding update
• Creates a new entry in binding cache
• Looks for entry corresponding to the destination
  address
• Home agent operation
• Checks validity of binding update
• Tunnels the packet to the CoA coincide with a
  prefix
• Mobile router operation
• Sends the prefix scope binding update to its HA
• Decapsulates packet and send packet to the
  original destination
• Sends prefix scope binding update to the original
  sender

5
Scenario of mobile network
Figure 1. Traditional nested mobile network
6
Handoff within the nested mobile network
Routing Table Prefix2 -gt MR2 Prefix3 -gt MR2
Routing Table Prefix1 -gt MR1


Binding Cache MR2 -gt CoAMR2 Prefix2 -gt
CoAMR2 Prefix3 -gt CoAMR2
Binding Cache MR1 -gt CoAMR1 Prefix1 -gt CoAMR1
HAMR1
Stationary Network
CN
FR
HAMR2
FR
FR
Mobile Network (e.g., Train)
MR2
FR
FR
Prefix 3
Prefix 2
MR1
Prefix 1
LFN1
LFN2
Figure 2. Handoff within the nested mobile network
7
Proposed Architecture

• MRA(Mobile Relay Agent)
• Role
• Upon receiving a packet, the MRA set its
  address in this packet and relays it to next MRA
  or destination
• Manage cache to support for mobile node or
  networks
• Assignment
• MRA is dynamically assigned mobile router on the
  path when mobile node or router sends Binding
  Update massage to Home Agent

8
Operation scenario in proposed Architecture
Figure 3. Scenario in nested mobile network with
MRA
9
Handoff in proposed Architecture
Figure 4. Handoff within the nested mobile
network
10
Simulation(1)
Figure 5. Response time of HTTP
Figure 6. Average of response time in the FTP
download
11
Simulation(2)
Figure 8. End-to-end of Video conference
Figure 7. Response time of DB Query
12
Conclusion

• This paper proposes MRA that supports route
  optimization in the nested mobile network
• Mobile IPv6 with MRA allows top-level Router on a
  mobile network to directly communicate with CN
• The simulation corresponding to response time of
  HTTP, FTP, DB and end-to-end delay of video
  conference shows that the proposed method is much
  better than the existing one