• This section lists the general features of the HNS-9201 terminal.
• The HNS-9201 Satellite Phone supports up to 11 local addresses that may be dynamically assigned via the UT DHCP server or statically assigned by the user.
• The HNS-9201 NAT is supported on three interfaces; Ethernet, Wireless LAN and USB.
• The dynamic local addresses assigned via DHCP will be in the IP address range starting from 192.168.128.101.
• The HNS-9201 will support static IP addresses in the range from 192.168.128.1 through 192.168.128.100.
• NEW FEATURE The HNS-9201 will allow the user to configure whether or not a background PDP Context is automatically started for IP addresses in the range of 192.168.128.101 through 192.168.128.199 (via the ACA parameter).
• NEW FEATURE The HNS-9201 will automatically activate a PDP Context for IP addresses in the range of 192.168.128.200 through 192.168.128.249 [see 1.1.7: Automatic Context Activation] with varying Quality of Service (QoS).
• The “global” or “network” IP address will be dynamically assigned by the BGAN UMTS Network or the Distribution Partners PoP. The global IP addresses can be in any subnet and each address may be in a different subnet.
• A static global IP address can also be used with the terminal for applications where a constant Internet address is needed for something like a web server or video streaming box. The Distribution Partner(DP)/Service Provider (SP) has to issue these static global addresses. Note: If the DP/SP uses private IP addressing at their Point-of-Presence (PoP), they will be responsible to assign a static mapping between the private static address and the Public static IP address. See diagram 1 below.
• During normal operations, PDP contexts may be set up or torn down which means that the global addresses may come and go dynamically.
• The HNS-9201 NAT supports FTP, H.323, ICMP and VPN (IDE, ESP, GRE, L2TP, PPTP) with ALG’s or other NAT code modifications as necessary.
• Multicast traffic is supported.

The BGAN User Terminal conforms to the standard Internet Protocol version 4 addressing using four byte IP addresses.  The three interfaces that connect with the user’s Terminal Equipment (USB, Wireless LAN, and Ethernet) are bridged in the terminal and the bridged interface is assigned a fixed address of 192.168.128.100.

The satellite network interface, available through the BGAN stack, will be assigned an IP address that is either assigned dynamically by the UMTS network or is assigned statically through the Service Provider at the request of the End-User.

This is the IP address that the User Terminal is reachable over the air interface.  This may be a private address of the DP as explained in diagram above.

The Hughes UT will use the IP address as an argument for PDP context activation.  Otherwise, a dynamic IP address is requested in the PDP context activation request.  The confirmation of the PDP activation will include the IP address that is assigned to the User Terminal (static or dynamic).

The flow of IP packets through the Satphone User Terminal involve several components described here.
In the outbound flow of traffic from the Terminal Equipment, a packet arrives at a UT network interface (USB, Wireless LAN, or Ethernet). The network interface receives the packet and passes it up the IP stack. The IP header is analyzed to determine the destination network interface that the packet is to be forwarded to.

The packet will match the default route in the routing table that will correspond to the satellite air interface. The forwarding function in the Hughes UT will pass the packet to the NAT module registered to the satellite air network interface. The NAT will maintain a mapping of to for each TE/PDP Context association.

The NAT modifies the IP header to substitute in the public IP address.

The packet is passed onto the UMTS interface driver.

The HNS-9201 will determine which PDP context the packet shall use to conform to the traffic flow template and quality of service requirements configured by the user.

The packet will then be passed to the Radio Access Bearer (RAB) for the proper PDP context for transmission over the BGAN satellite system.

The HNS-9201 will now pass the packet through the Packet Data Convergence Protocol (PDCP), Bearer Connection (BCn) Layer and the Bearer Control Layer (BCt) layers of the BGAN air interface protocol stack.

Incoming IP packets follows the same path as the outbound flow in the reverse direction.

The DHCP service allows hosts running on Terminal Equipment with DHCP clients to be configured automatically with a unique IP address upon connection to the UT. The DHCP server assigns an IP address on a lease basis.

The DHCP server implemented in the Hughes UT conforms to Internet Standard RFC 2131.

The dynamic local addresses assigned via DHCP or statically via the End-user, will be in the IP address range from 192.168.128.101 to 192.168.128.199.