IP over 802.16 Problem Statement draft-jee-16ng-ps-goals-00.txt Junghoon Jee, ETRI Syam Madanapalli Jeff Mandin Gabriel Montenegro Soohong Daniel Park Maximilian Riegel Samsung Runcom Microsoft Siemens March 22nd, 2006 16ng BoF, IETF65

IEEE 802.16 PMP Link Layer No native bi-directional multicast support No direct communication between MS/SSs Connection-oriented MAC Connections always between MS/SS and BS MAC PDUs are transferred according to CID 48-bit MAC addresses are not used for transmission Ethernet CS does not provide Ethernet functionality over the air Specifies only encapsulation and classification of Ethernet Frames for transmission over CIDs March 22nd, 2006 16ng BoF, IETF65

IP Subnet Model over 802.16 IP Subnet Link Topological area that uses the same address prefix, where that prefix is not further subdivided except into individual addresses. Link Topological area bounded by routers which decrement the IPv4 TTL or IPv6 Hop Limit when forwarding the packet. March 22nd, 2006 16ng BoF, IETF65

IP Subnet Model over 802.16 (2) IP Subnet model for 802.16’s PMP links 3G like Subnet Model SSs do not share the same global address prefix. Only the IP Gateway is neighbor. Ethernet like Subnet Model SSs share the same global address prefix. All SSs under an IP Gateway are neighbors. March 22nd, 2006 16ng BoF, IETF65

Next Hop Determination & Address Resolution IP CS No need of address resolution, “IP to MAC”. ARP might need to be blocked (driver impl.). However, NDP is performed at IP level. Blocking=> Different IPv6 stacks for 802.16 Redundantly Perform=> Unnecessary signaling March 22nd, 2006 16ng BoF, IETF65

Next Hop Determination & Address Resolution (2) Ethernet CS 3G like Subnet Model Next-hop needs to be always IP Gateway. No way to force the SS’s next hop because it is internal IP stack’s decision based on the destination prefix. Ethernet like Subnet Model Can expect not requiring the change of “IP over Ethernet”. Requires multicast emulation over connection-oriented MAC. March 22nd, 2006 16ng BoF, IETF65

Stateless Autoconfiguration and DAD 48-bit MAC address can be used. 3G like Subnet model DAD is trivial only between SS and IP Gateway. Ethernet like Subnet model DAD for LLA might not guarantee the IID’s uniqueness. March 22nd, 2006 16ng BoF, IETF65

Gap Analysis 3GPP recommendation: RFC 3314 IP over Ethernet: RFC 894 Uses PPP to assign unique IID. No 802.16 CS for classification of PPP frames. Direct transfer of PPP frames is not possible. IP over Ethernet: RFC 894 Ethernet CS does not provide Ethernet functionality over the air. Requires multicast emulation over connection-oriented MAC. Need to specify “IP over 802.16”! March 22nd, 2006 16ng BoF, IETF65