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Network Research Lab. Sejong University, Korea Jae-Kwon Seo, Kyung-Geun Lee Sejong University, Korea.

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Presentation on theme: "Network Research Lab. Sejong University, Korea Jae-Kwon Seo, Kyung-Geun Lee Sejong University, Korea."— Presentation transcript:

1 Network Research Lab. Sejong University, Korea Jae-Kwon Seo, Kyung-Geun Lee Sejong University, Korea

2 Network Research Lab. Sejong University, Korea  Introduction  Related works  Proposed scheme  Simulation Experiment  Numerical Analysis  Conclusion 2

3 Network Research Lab. Sejong University, Korea  Mobility support in IPv6 (MIPv6) ◦ Home Agent (HA) ◦ Temporary address, Care-of-Address (CoA) ◦ A mobile node(MN) moves to a foreign network,  Binding update : MN->HA 3

4 Network Research Lab. Sejong University, Korea 4 HA MN CN Intercept & Encapsulation ①, ② : Binding Update/Acknowledge ③, ④, ⑤ : First User Data Packet Delivery

5 Network Research Lab. Sejong University, Korea ◦ Authenticating binding-update requires 1.5 RTT between MN and CN ◦ One RTT is needed to update the HA ◦ A Mobile Node has to register to the HA every handover occurs 5

6 Network Research Lab. Sejong University, Korea  Two addresses ◦ Regional CoA (RCoA) : MAP prefix based ◦ On-link CoA (LCoA) : current AR prefix based  Mobility Anchor Point (MAP) ◦ Local HA ◦ Intercepts the packets destined to RCoA ◦ Tunnels the packets to the LCoA  Two binding updates ◦ Regional binding update : RCoA -> HA ◦ Local binding update : LCoA -> MAP 6

7 Network Research Lab. Sejong University, Korea 7 7 MAP HA CN Internet MAP old AR newA R MAP domain MN Local BU (Home address, RCoA) (RCoA, Home BU Local BU LCoA’) LCoA )

8 Network Research Lab. Sejong University, Korea 8 reduces wired signaling cost & reduces update latency MN ARHA or CN MNAR HA or CN MAP MIPv6 HMIPv6

9 Network Research Lab. Sejong University, Korea  Efficiently in supporting micro-mobility ◦ Within a MAP domain  Not appropriate in supporting macro-mobility ◦ Inter-MAP domain handover ◦ longer handover latency with more packet loss 9

10 Network Research Lab. Sejong University, Korea 10

11 Network Research Lab. Sejong University, Korea  Velocity-based MAP selection scheme ◦ Fast MNs select the HMAP ◦ Slow MNs select the LMAP  Load control scheme ◦ The MAP checks the maximum number of MNs ◦ Decides whether to receive or to reject a registration request of the MN ◦ Rejected MN selects the next candidate MAP  Velocity based + load control, velocity based + moving range of the MN… 11

12 Network Research Lab. Sejong University, Korea  Estimated velocity may not reflect the current velocity  MNs do not always move with constant velocity and direction  Slow MN eventually encounters the inter-domain handover but this case is not considered  This paper proposes a MAP changing scheme using a virtual domain (VD) 12

13 Network Research Lab. Sejong University, Korea  Simple method ◦ Considering only current moving direction and position of the MN ◦ Reduces significant overhead generated by complex computation procedure ◦ Not responsible for wrong prediction  Virtual domain ◦ Assigning ARs to the domain of the Higher layer MAP (HMAP) 13

14 Network Research Lab. Sejong University, Korea 14 Changing Point 1 : MN moves to the changing point of the VD 2 : MAP changing request message 3 3 : Binding Update (LCoA) 4 4 : Biding Ack. 5 5 : Binding Update (RCoA) 6 6 : Binding Ack.

15 Network Research Lab. Sejong University, Korea 15

16 Network Research Lab. Sejong University, Korea 16 only

17 Network Research Lab. Sejong University, Korea  The changing point is AP (802.11) or BS(802.16)  The MAP changing procedure is similar to the inter-domain handover ◦ Except for the generating procedure of the LCoA  Inter-domain handover occurs ◦ MN completes the handover using binding update with LCoA only.  Does not generate packet loss ◦ The MAP changing procedure changes the routing path only from CN to MN while receiving packets  Load concentration of a HMAP is distributed in VD ◦ MNs registered with HMAP and LMAP coexist in VD 17

18 Network Research Lab. Sejong University, Korea ◦ Simulation topology  NS-2 18

19 Network Research Lab. Sejong University, Korea  RTT between MN and CN 19 Furthest selection scheme Nearest selection schemeMAP changing scheme

20 Network Research Lab. Sejong University, Korea  When the ping-pong movement occurs 20

21 Network Research Lab. Sejong University, Korea  Average number of the encapsulated packets at HMAP (HMAP load) 21

22 Network Research Lab. Sejong University, Korea 22  State diagram for random walk mobility model 22 MAP domain consist of rings

23 Network Research Lab. Sejong University, Korea  A ring k is composed of 6k subnets except the ring 0  The number of subnets  If the MN is located in a subnet of ring k  The probability that a movement will result in an increase or decrease in the distance from the center subnet 23

24 Network Research Lab. Sejong University, Korea  Markov chain as the distance between the current location of the MN and center of the domain  The transition probabilities  where q is the probability that a MN stays in the current subnet  The steady state probability 24

25 Network Research Lab. Sejong University, Korea 25

26 Network Research Lab. Sejong University, Korea 26

27 Network Research Lab. Sejong University, Korea 27

28 Network Research Lab. Sejong University, Korea  HMIPv6 has been proposed to compensate for the problems in employing MIPv6 ◦ but, longer handover latency than MIPv6 when inter-domain handover occurs ◦ load concentration at a particular MAP  This paper proposes MAP changing scheme using VD of HMAP ◦ predictably changes the MAP  May not assure accurate prediction ◦ Reduces overhead generated by complex computation procedure  Performance evaluation ◦ Average number of registration with HA and CN is increased ◦ However, MAP changing scheme reduces inter-domain handover latency ◦ And load concentration of the HMAP is distributed  Future work ◦ How to decide the optimal range of a VD ◦ Simulate the proposed scheme in extended topologies 28

29 Network Research Lab. Sejong University, Korea 29 Thank you for your attention ! Question ?

30 Network Research Lab. Sejong University, Korea 30


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