User's Manual
Mobile WiMAX RAS SPI-2L10 System Description/Ed.00
© SAMSUNG Electronics Co., Ltd.
2-5
2.2.2 Call Processing Function
Cell Initialization Function
The SPI-2L10 announces the MAC Management message such as DCD/UCD/MOB_NBR-
ADV to the cell area in service periodically to enable the MS receiving the message to
carry out the appropriate call processing function.
Call Control and Wireless Resource Allocation Function
The SPI-2L10 enables an MS to enter to or exit from the network. When an MS enters to or
exit from the network, the SPI-2L10 transmits/receives the signaling message required for
call processing via R1 interface with the MS or R6 interface with ACR.
The SPI-2L10 allocates various management/transport Connection Identifier (CID)
required for the network entry and service to an MS. When the MS exit from the network,
the SPI-2L10 collects and release the allocated CID.
Handover
The SPI-2L10 carries out the signaling and bearer processing for inter-sector HO
(Handover), inter-ACR HO and inter-carrier HO. At this time, ACR relays the handover
message between serving RAS and target RAS through the R6 interface.
Support of Sleep Mode
Sleep mode is defined in the IEEE 802.16 standard to save MS battery power. When the
MS transits to Sleep mode or the MS in Sleep mode returns to Awake mode, the SPI-2L10
sends and receives the required signaling messages to and from the MS and carries out the
corresponding call processing functions.
Admission Control (AC) Function
When receiving a call setup request, such as network entry, QCS (or network re-entry), or
handover request, from the MS, the SPI-2L10 carries out the admission control function
that monitors the CPU load, the traffic load and the number of users in Awake mode for
each subcell, and the number of service flows for each MS, subcell and QoS class to
prevent system overload and guarantee service quality.
MAC ARQ Function
The SPI-2L10 carries out the ARQ function of the MAC layer. In packet data exchange, the
transmission side transmits ARQ block which SDU is divided into, and retransmits the
packet according to the ARQ feedback information received from the reception side to
raise the reliability of data communication.
The SPI-2L10 carries out the following function for the service flows applying ARQ:
y MAC Management creation and transmission concerned with ARQ operation
y Feedback processing depending on ARQ types
y Block processing (fragmentation/reassemble/retransmission) depending on ARQ types
y ARQ timer/window management