User's Manual

Mobile WiMAX RAS SPI-2213 System Description/Ed.02

Figure 1.5 4T4R with CDD (Matrix B + CDD mode)

2.3.2 Call Processing Function

Cell Initialization Function

The SPI-2213 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-2213 enables an MS to enter to or exit from the network. When an MS enters to or

exit from the network, the SPI-2213 transmits/receives the signaling message required for

call processing via R1 interface with the MS or R6 interface with ACR.

The SPI-2213 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-2213 collects and release the allocated CID.

Handover

The SPI-2213 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.

To minimize the traffic disconnection in inter-RAS HO, the SPI-2213 performs the data

switching function. In handover, the SPI-2213 enables the serving RAS to switch the user

data in queuing to the target RAS and, therefore, the MS to recover the traffic without loss.

Handover Procedure

For the detailed handover procedure, refer to Chapter 4 ‘Message Flow’.

OFDM

Cyclic Prefix

Data A

Cyclic Prefix

Cyclic

Delay

Receiver

Data B

Data A (Delayed)

Data B (Delayed)