1. IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-06-0602-00-0000 Title: PoA Capabilities of IE with IPv6 Prefix Availability Date Submitted: May 2006 Authors or Source(s): Soohong Daniel Park Abstract: This document proposes a new value to be included into PoA Capabilities of IE to allow mobile node to sense its PoA’s IPv6 prefix availability.

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3. Higher layer services and information IEs What we already have:  TYPE_IE_POA_SUBNET_INFORMATION (per PoA)  TYPE_IE_POA_CAPABILITIES (per PoA) Security Available (Y/N) QoS Available (Y/N) Emergency Service Available (Y/N) Others Consensus to increase IE’s utilities were made by Higher Layer IE Adhoc at Denver meeting.

4. PoA Capabilities It defines bitmap of PoA capabilities such as; Bit 0: Security (Y/N) Bit 1: QoS (Y/N) Bit 2: Internet Access (Y/N) Bit 3: IP Version 4 (Y/N) Bit 4: IP Version 6 (Y/N) Bit 5: Emergency Services (Y/N) Bit 6-31: Reserved “Bit 4-IPv6 Version 6” is not enough for mobile node to recognize a PoA capability in terms of IPv6 because of lack of IPv6 prefix available bits. To reduce network bandwidth (especially wireless environment), network administrator turns off IPv6 prefix delegation (or does not configure IPv6 prefix on the default router). It is a general case in terms of IPv6 network configuration. Router Advertisement contains zero or more prefix information (described in RFC 2462)

5. A new bit of PoA Capabilities TypeDescriptionLengthValue TYPE_IE_POA_CAPABILITI ES PoA Capabilities 4 octets PoA Capabilities bitmap Bit 0: Security Y/N Bit 1: QoS Y/N Bit 2: Internet Access Y/N Bit 3: IP Version 4 Y/N Bit 4: IP Version 6 Y/N Bit 5: IP Version 6 Prefix Available Y/N Bit 6: Emergency Services Y/N Bit 7-31: Reserved 6.3.4.3.6 PoA Capabilities (for each PoA of Access Network + Operator combination)

6. Applicable operation If mobile node receives “IP Version 6 Prefix Available (N)” from PoA-1 Preparing DHCPv6 when attaching to PoA-1 Not soliciting any IPv6 Router Solicitation to PoA-1 Reducing RS/RA delay