1. Inter-Mobility Support in Controlled 6LoWPAN Networks Zinonos, Z. and Vassiliou, V., GLOBECOM Workshops, 2010 IEEE

2. Outline 2  Abstract  Two types of mobility  Intra-PAN (micro-mobility)  Inter-PAN (macro-mobility)  Evaluation  Conclusion

3. Abstract 3  This paper propose a new mobility management protocol for 6LoWPAN  uses the technology of Proxy Agents and aims to enhance the handoff time by predicting or rapidly responding to a handover event.  Supportive in mobility scenarios in order to reduce the number of signaling between the MN and the Home Agent.

4. Two types of mobility  Intra-PAN (micro-mobility)  Device movement within a single Wireless PAN domain.  The sensor node moves within the domain without losing the connectivity with the Sink node.  Inter-PAN (macro-mobility)  Device movement between multiple Wireless PAN domains.  Sensor nodes move between different sensor networks, each one with its Sink node responsible to configure and manage all the aggregated devices.  The IPv6 prefix of the network is changed. 4

5. Intra and Inter PAN mobility HA1 HA2 Backbone router Internet PAN 1 PAN 2 Proxy Mobility Node Intra-PAN Inter-PAN 5

6. Intra-PAN mobility scenario 1. 6LoWPAN PAs located in the same network will advertise the same prefix. 2. The address of the MN inside the same network is not changed. 3. All the data from/to the MN are not routed via the PA but from the other neighbors nodes based on the routing protocol that is used. 4. The proxy node and MN exchange packets when the MN is bootstrapping. 6

7. Intra-PAN mobility procedure 7

8. Inter-PAN mobility scenario 1. 6LoWPAN proxy agents located in different networks will advertise different prefixes. 2. Home Agents have direct access between them. 3. The address of the MN when is moving between different PANs is changed. 4. The parent proxies have all the necessary information to perform the Duplicate Address Detection (DAD) procedure on behalf of the MN. 5. The Home Agents are responsible to create the 16-bit address of the MN that will be used to route packets inside the 6LoWPAN network. 8

9. Inter-PAN mobility scenario (cont.) 6. The Home Agents will maintain a binding table where the Global IPv6 address, the Care-of Address, the 16-bit address, the parent proxy address and a timestamp is stored as shown in Table I. 9

10. Inter-PAN mobility procedure FCBU = Fast Binding Update FCBA = Fast Binding Acknowledgement BU=Binding Update BA= Binding Acknowledgement Proxy Conf = Proxy confirmation 10

11. Inter-PAN mobility procedure (cont.) 11 HA1 HA2 Backbone router Internet PAN 1 PAN 2 Proxy Mobility Node 1. RSSI 2. join 3. FCBU 4. BU 5. BA 6. FCBA 7. joinACK

12. MN mode state 12  The proxies must be configured to send advertisements to their serving MNs in a predefined interval (every second) so that to guarantee that the node mobility can be detected.  MN will be aware of that interval.

13. Evaluation 13  The general handover delay for all the protocols can analytically be computed as: D = D L2 + D BS + D REG + D PROC (1) D L2 Link Layer Establishment Delay D BS Bootstrapping (ND (D ND ) and DAD (D DAD ) ) D REG BU/Registration Delay D PROC Processing and queuing delay

14. Evaluation 14  The total transmit bytes are equal to trigger bytes + FCBU bytes + JoinAck bytes = 103 bytes.  The total received bytes are equal to Total = #joins ∗ 37bytes + FCBAckbytes +ProxyConfbytes = 109bytes (2)

15. Evaluation 15  MN signaling cost

16. Conclusion  This paper proposed a mobility model that promises soft handoffs and controlled disconnections between different PANs.  The model is based on the involvement of a proxy node that is responsible to handle, on behalf of the MN, the mobility-related messages.  This work has performed a detailed decomposition and analysis of the handover delay and has shown the validity and applicability of the proposed solution. 16

17. 每周一句 17  in order to = to  In order to support a network-based solution we introduce an entity called 6LoWPAN proxy agent (PA).  This means that it must be pre-configured to wait for a specific time interval before sending a Join Ack message in order to make sure that all possible Join messages arrive.  so as to  for the purpose of

18. Thanks for listening.

19. HA1 HA2 Backbone router Internet PAN 1 PAN 2 Proxy Mobility Node 19

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