1
16ng, 65th IETF Meeting Dallas, March 22, 2006

• QoS Aware RT Support for IPv6 in IEEE 802.16
  Backhaul Scenarios
• draft-neves-rt-qos-ipv6-80216-00

Pedro Neves Susana Sargento Rui L. Aguiar IT
Aveiro
2
Virtual MAC address

• Virtual MAC (VMAC) address
• Built based on the IEEE 802.3 scheme
• Used to perform packet classification
• Instead of the original MAC address
• VMAC address usage requires synchronized
  translation rules
• Access Router Translation entity - 16 ART
• Access Point Translation entity - 16APT
• 802.16 Control Protocol - 16CP

3
System Setup

• Basic Service flows installation
• Network Access (MNA-DL-SF MNA-UL-SF)
• Auxiliary Service Flow (SF) to allow fast MN
  network access
• Mobility (MAUX-DL-SF MAUX-UL-SF)
• Auxiliary SF to permit fast handovers without
  traffic disruption
• IPv6 Router Discovery process (RA-DL-SF)
• SF for Router Advertisement messages

4
MN Network Access

• Create an auxiliary service flow for the MN
  (MN-AUX-SF)
• MN associates with the AP
• MNA-REQ (AP?AR)
• Trigger MN-AUX-DL-SF MN-AUX-UL-SF reservation
• MN-AUX-DL-SF MN-AUX-UL-SF are completed
• MNA-RSP (AR?AP)
• Acknowledgment
• Howeverthis process is not instantaneous
• Packets can be delayed or lost
• MNA-DL-SF MNA-UL-SF are used while MN-AUX-DL-SF
  MN-AUX-UL-SF are being created
• Requires translation rules to redirect packets

5
MN Network Access
Create MN-AUX-SF
MN associates
MNA-REQ
MNA-RSP
SIGN DATA

• AR Translation Rules
• DL MN MAC ? VMAC_MNA_DL
• UL VMAC_MNA_UL ? MN MAC

• AP Translation Rule
• DL VMAC_MNA_DL ? MN MAC
• UL MN MAC ? VMAC_MNA_UL

6
MN Network Access
Create MN-AUX-SF
MN associates
MNE-REQ
MNE-RSP
SIGN

• AR Translation Rules
• DL MN MAC ? VMAC_MAUX_DL

• AP Translation Rule
• DL VMAC_MAUX_DL ? MN MAC
• UL MN MAC ? VMAC_MAUX_UL

7
Dynamic Service Differentiation

• Distinguish two different services using the
  Ethernet CS
• VMAC addresses usage is required to achieve
  differentiation
• Each service has a specific VMAC address
  associated
• AR MAC address is translated to the associated
  VMAC address (MAC?VMAC) and sent in the
  correspondent SF
• AP the reverse translation (VMAC?MAC) is
  performed and the packet is delivered to the MN
• Translation rules must be installed and
  synchronized
• 802.16 Control Protocol (16CP)
• TRULE-REQ TRULE-RSP

8
DL Dynamic Service Differentiation

• AR Translation Rules
• S1 MN MAC ? VMAC_DL_S1
• S2 MN MAC ? VMAC_DL_S2

• AP Translation Rules
• S1 VMAC_DL_S1 ? MN MAC
• S2 VMAC_DL_S2 ? MN MAC

9
Fast Mobility

• Fast mobility without traffic disruption is
  mandatory
• A dedicated SF for the MN in the new BS must be
  created (MN-AUX-DL-SF MN-AUX-UL-SF)
• This is not an instantaneous process
• Thus, how can we avoid traffic disruption while
  the dedicated SF is being allocated???
• Use MAUX-DL-SF MAUX-UL-SF established during
  the system setup phase
• Reservation is completed
• Packets are redirected from the MAUX-DL-SF
  MAUX-UL-SF to the MN-AUX-DL-SF MN-AUX-UL-SF

10
Thank You !