1. - IETF 64 - FMIPv6 over IEEE 802.16 (draft-jang-mipshop-fh80216-00’.txt) HeeJin Jang, Youn-Hee Han, Soohong Daniel Park SAMSUNG Junghoon Jee, Jaesun Cha ETRI

2. - IETF 64 -2/9 802.16 Deployment Architectures 802.16 Handover Overview Change points –Two New Primitives –Handover Scenarios –Implementation with 802.21 MIHF Q&A Contents

3. - IETF 64 -3/9 802.16 Deployment Architectures IP Mobility is required Fig. (a) a subnet = one AR + several BSsFig. (b) a subnet = one AR + one BS

4. - IETF 64 -4/9 802.16e Handover Overview Target BS Serving BS MOB_MSHO-REQ MOB_BSHO-RSP MOB_HO-IND MOB_NBR-ADV MN L2 (MS) Scanning MOB_SCN_REQ MOB_SCN_RSP 802.16e Network re-entry Packets 1)MN collects info. about the serving BS and neighboring BSs through the periodic L2 neighbor advertisement and the scanning. 2)MN starts HO by sending MOB_MSHO-REQ to BS and then BS replies with MOB_BSHO-RSP including the candidates BSs. 3)MN selects the target BS and then sends the MOB_HO-IND to the serving BS and switches the links 4)After the HO, MN performs the network re-entry procedures.

5. - IETF 64 -5/9 Changes from the initial presentation –Two more primitives are defined –Five HO steps are changed into four HO steps –Implementation with 802.21 MIHF (Media Independent Handover Function) is described Change points

6. - IETF 64 -6/9 Four Primitives for interaction of FMIPv6 & 802.16e PrimitivesDirectionDescriptionAction Link_Going_DownL2->L3 The signal strength goes low and it’s time to prepare for the handover L3 sends FBU Link_UpL2->L3The link became available now.L3 sends FNA New_BS_FoundL2->L3New BS is detectedL3 sends RtSolPr Link_SwitchL3->L2Switch to the new linkL2 switches to the new link We defined two more primitives, New_BS_Found and Link_Switch New_BS_Found is triggered from L2 to L3 when new BS is detected in order that the MN starts the NAR discovery by exchange of RtSolPr & PrRtAdv Link_Switch is introduced to notify L2 of L3 HO preparation completion –By default, L2 doesn’t need to wait this primitive –It could be implemented to make higher the possibility of predictive HO

7. - IETF 64 -7/9 L2/L3 Handover Scenarios 1)NAR Discovery –MN learns the neighboring BSs –NAR IP address resolution with BSID after getting (1) 2)HO Preparation –MN requests HO and gets the reply back from the BS and triggers (2) –Tunnel is setup and packets are redirected to NAR –NCoA is confirmed 3)HO Execution –After the arrival of FBAck, MN issues (3). –MN L2 sends HO indication to the serving BS and switches the links –IEEE 802.16e network entry 4)HO Completion –MN sends FNA and receives the buffered packets from NAR Conceptually divided into four steps: 5 steps => 4 steps –802.16 network entry step is integrated into HO execution step 1) New_BS_Found 2) Link_Going_Down 3) Link_Switch 4) Link_UP

8. - IETF 64 -8/9 Implementation with 802.21 MIHF New BS detected Link goes down Link up L3 HO preparation is completed MIHF 802.16e Link_Going_Down (E) MN FMIPv6 Link_Detected (E) MIH_Switch (C) Link_Up (E) New_BS_Found Link_Going_Down Link_Switch Link_Up MIH function services –MI Event service (MIES) –MI Command service (MICS) –MI Information service (MIIS) If the terminal is equipped with MIHF module, the proposed primitives can be implemented to cooperate with 802.21 MIHF

9. - IETF 64 -9/9 Future Works We assumed that Neighbor discovery over 802.16 networks works well. We need to consider the problems which may also cause mal-operation in FMIPv6.