name: PMIP
full_form: Proxy Mobile IPv6
context: In current LAN environments the most commonly used configuration protocol is DHCP (Dynamic Host Configuration Protocol, RFC 2131Â [26]) and DHCPv6 (Dynamic Host Configuration Protocol for IPv6, IETF RFC 3315Â [46]). It provides a mechanism for passing a large set of configuration parameters to hosts connected to a TCP/IP network (IP address, sub-net mask, domain name, MTU, etc.) in an automatic manner. Moreover DHCP may assign IP addresses to clients for a finite lease time, allowing for sequential reassignment of addresses to different users.
  The lease time is chosen by the administrator of the DHCP server (in the external network), and is therefore out of the scope of the present document.
  The Packet Domain may obtain IP address via external DHCP server during the packet bearer establishment procedures (e.g. PDP Context activation, default bearer establishment). The GGSN/P-GW acts as a DHCP client towards the external DHCP server.
  The Packet Domain offers the end user the possibility to run DHCP end-to-end the same way as he does when connected directly to a LAN (e.g. an enterprise Intranet). No modifications should be required in common implementations of DHCP clients and servers. However in non-EPC based Packet Domain, a DHCP relay agent function is needed in the GGSN so as to allow correct routing of DHCP requests and replies between the TE and the DHCP servers. In EPC based Packet Domain for 3GPP access networks, the P-GW acts a DHCP server towards the UE and it acts as a DHCP client towards the external DHCP server. For trusted non-3GPP access networks, the non-3GPP access network may act as a DHCP relay or DHCP server. In the trusted WLAN access network, the TWAN acts a DHCP server towards the UE and PGW acts as a DHCP client towards the external DHCP server for the GTP/PMIP-based S2a.
  In non-EPC based Packet Domain,at PDP context activation no IP address is allocated, this is done afterwards through DHCP. After the TEâs configuration has been completed by DHCP, the PDP context is updated by means of the GGSN-initiated PDP Context Modification Procedure in order to reflect the newly assigned IP address.
  In the following cases the bearer associated with the allocated IP address (i.e. IPv4 address or IPv6 prefix) shall be released:
  -        if the DHCP lease expires;
  -        if the DHCP renewal is rejected by the DHCP server;
  -        if the IP address is changed during the renewal process. Usually when the lease is renewed, the IP address remains unchanged. However, if for any reason (e.g. poor configuration of the DHCP server), a different IP address is allocated during the lease renewal process the associated bearer shall be released.
description: The PMIP-based S2a interface involves the use of DHCP relay or DHCP server functions to manage IP address allocation for devices connected to the trusted non-3GPP access network.
explanation: PMIP is categorized as a Protocol because it manages mobility and routing functions in mobile networks.
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