User's Manual

Mobile WiMAX Outdoor RAS SPI-2210 System Description/Ed.05

3.3.2.3 RAS Traffic Controller (RTC)

The RTC is the block to process the traffic of the outdoor SPI-2210. The RTC is the block

pertaining to the bearer plane and is located as the kernel module format of the

corresponding CPU. The RTC performs the R6 interface under IEEE 802.16 standard and

enables to the modem block to perform the R1 interface normally.

The RTC fragments the user data received from ACR via the R6 interface in MAC PDU

format and transfers the data to the modem block or re-assembles the MAC PDU received

from an MS via the R1 interface and transmits to ACR.

In addition, the RTC interworks with the RTC block controlling the RAS signal and

performs the call setup/release procedure. This process is carried out via the memory

interface in the RAS card (MRA-S). The RTC communicates with the modem block via the

PCI interface.

The RTC is activated on MRA and its main functions are as follows:

 ARQ function: Receives the ARQ feedback message from an MS and processes the

message.

 Analyzes and processes the RSC control message and performs the queue

management.

 Performs the traffic interface with the modem block.

 Performs the scheduling function for each QoS class

 Data Traffic Processing Function

RTC provides the data path between ACR and the outdoor SPI-2210 via the R6 data

path (GRE tunnel).

 Traffic Control Function for Handover

In handover, RTC performs the data synchronization function between serving

RAS/ACR and target RAS/ACR.