IPv6%20over%20802.16%20IPv6CS

1
IPv6 over 802.16 IPv6CS

• B. Patil, JH. Choi, B. Sarikaya, F. Xia, S.
  Madanapalli
• November 7, 06

2
What the I-D specifies

• Addressing and Operation of IPv6 over the IPv6
  convergence sublayer of 802.16
• Recommends the assignment of unique prefix(es)
  for each host
• Based on a point-to-point link between the host
  and the AR

3
The IPv6 convergence sublayer

• The 802.16 MAC is connection oriented
• The CS is a part of the MAC
• Multiple variants of service specific CS exist
• IPv6 CS, IPv4 CS and Eth CS are types of Packet
  CS
• IPv6 runs directly over the 802.16 MAC (I.e over
  the IPv6 CS part of the MAC)

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Network model
A
BS/IPv6 AR
IPv6Host
Transport Connection (CID)
B
BS
IPv6Host
CIDx
CIDy
IPv6 AR
IPv6Host
5
IPv6 Link
Host
IPv6 AR
BS
IPv6
IPv6
IPv6
IPv6
IP-CS
IP-CS
GRE
GRE
LNK
MAC
MAC
IP
IP
PHY
PHY
PHY
LNK
LNK
PHY
PHY
IPv6 link

• On completion of the network entry procedure
  (.16 specific)
• A transport connection is established between
  the host and BS
• In case the AR is separate a L2 tunnel mapped to
  the transport connection is created between the
  BS and AR
• The host can now send/receive IP packets (RA/RS,
  DHCP, ND) - IPv6 link up

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Prefix assignment

• Each MS is on a separate subnet as a result of
  the point-to-point link. One or more /64 prefixes
  should be assigned to a link which consists of
  only an AR and an MS
• A unique prefix(es) is allocated for a host
• The prefix is advertised in a Router
  Advertisement (RA) message with standard Prefix
  Information Option

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Neighbor Discovery

• Neighbor Discovery is performed as per RFC 2461.
• Router Discovery
• After host attachment, it may send an RS and an
  AR would reply with a suitable RA. Or the AR may
  send an RA to the host upon IPv6 link
  establishment. The AR may send unsolicited RAs
  periodically.
• Prefix Discovery
• Prefix is recommended to be advertised with L-bit
  set to facilitate DNA operation.

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IPv6 addressing

• Interface Identifier
• The MS has a 48-bit MAC address as specified in
  802.16. With the MAC address, the MS generates
  the 64 bit interface identifier (IID) as per
  RFC2464 for address autoconfiguraiton.
• For addresses based on privacy extensions, the MS
  may generate random IIDs as specified in RFC3041.
  
• Duplicate address detection
• DAD is performed as per RFC2461 and RFC2462.

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IPv6 addressing

• Stateless address autoconfiguration is performed
  as per RFC 2461, 2462.
• Obtaining the IPv6 address through stateful
  address autoconfiguration method is as per the
  details in RFC3315

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WG LC Issues

• Harmonize terminology with the PS doc
• Reference to RFC3314 as the precedent to be
  modified and the link model discussion referenced
  instead
• MTU value to be used from RA
• Reference DNA I-D instead of RFC4135
• Reference RFC 3633 as a means for obtaining the
  prefixes to be assigned

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