User's Manual

Mobile WiMAX Indoor RAS SPI-2210 System Description/Ed.07

Handover

The indoor SPI-2210 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 indoor SPI-2210 performs the

data switching function. In handover, the indoor SPI-2210 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’.

Support of Sleep Mode

Sleep mode is the mode defined to save the MS power under IEEE 802.16 standard and

indicates the status that air resources allocated to an MS are released when the MS does not

need traffic reception/transmission temporarily. If the MS in Sleep Mode needs the traffic

reception/transmission, the MS returns to the normal status immediately.

Both Idle Mode and Sleep Mode are modes to save the MS power. The Idle Mode release

all service flows allocated to an MS, while the Sleep Mode releases only the air resources

between the MS and RAS temporarily, continuously keeping the service flow information

allocated to the MS.

The indoor SPI-2210 carries out the related call processing function by receiving/sending

the signaling message required for the MS's status transition into Sleep Mode and the MS

return from the Sleep Mode to Awake Mode.

Admission Control (AC) Function

If the indoor SPI-2210 receives the call setup request, such as network entry, QCS and

handover, from an MS, it monitors the traffic and signaling load for each subcell and the

number of user in Active/Sleep Mode and performs the AC function to prevent the system

overload.

AC can be roughly divided into AC by MS and AC by service flow.

 AC by MS

If the number of users who the subcell is in Active/Sleep Mode exceeds the threshold

when the indoor SPI-2210 receives the call setup request from an MS, it rejects the

call setup request of the MS.

 AC by service flow

When service flow is added, the indoor SPI-2210 checks if the air resources of the

requested subcell exceed the threshold and determines the creation of the service