Ip Processing Functions; Figure 2.1 Ipv4/Ipv6 Dual Stack Operation - Samsung Mobile WiMAX Outdoor RAS SPI-2331 System Description

The modem that receives the packet traffic performs the scheduling by using the uplink/
downlink algorithm, such as Proportional Fair(PF) or Round Robin(RR) and transmits the
scheduled allocation information to an MS through DL/UL MAP.
The MS receiving the DL/UL MAP checks the air resources allocated to the MS and
modulates/demodulates the downlink packet or transmits the uplink packet from the
allocated uplink area.
Since the outdoor SPI-2331 provides the QoS monitoring function, it can compile statistics
on packets unsatisfying the latency requested from the QoS parameter according to TDD
frames and report the statistics to an operator via the OAM interface.

2.2.3 IP Processing Functions

IP QoS Function
Since the outdoor SPI-2331 supports Differentiated Services(DiffServ), it can provide the
backhaul QoS in the communication with ACR.
It supports 8-class DiffServ and supports the mapping between the DiffServ service class
and the service class of the user traffic received from an MS. In addition, the outdoor SPI-
2331 supports between Differentiated Services Code Point(DSCP) and 802.3 Ethernet
MAC service class.
Simultaneous Support of IPv4/IPv6
ACR communicates with the outdoor SPI-2331 through the GRE tunnel and the backhaul
IP version between the outdoor SPI-2331 and ACR is managed independently from the
service IP version for the MS.
Even if, therefore, IPv4 is used in backhaul between the outdoor SPI-2331 and ACR, all of
IPv4, IPv6 and IPv4/IPv6 dual stack services can be supported.
Dual Stack MS
(IPv4/IPv6)
© SAMSUNG Electronics Co., Ltd.
Mobile WiMAX Outdoor RAS SPI-2331 System Description/Ed.02
RAS
Dual Stack Processing
Access Network
IPv4
IPv6

Figure 2.1 IPv4/IPv6 Dual Stack Operation

Core Network
ACR
IPv6 Network
Gateway
Gateway
IPv4 Network
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