User's Manual

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

4.1.4 Location Update

Inter-RAS Location Update

The following is the location update procedure when the MS moves to other paging group

in the same ACR.

Figure 4.7 Inter-RAS Location Update Procedure

Classification Description

(1) When the Idle Mode MS in the paging group 1 moves to the paging group 2, it

receives the PAG-ADV message and recognizes that the location has been

changed.

(2)~(3) The MS transmits the RNG-REQ message to a new RAS (RAS 2) including the

MAC address, the Location Update Request, and the Paging Controller ID and

the RAS 2 transmits the Location Update Request message to the ACR.

(4)~(5) The ACR transmits the Location Update Response message including the

paging information and the AK Context information to the RAS 2. The RAS 2

checks the CMAC validation and transmits the RNG-RSP message including the

LU Response to the MS, and notifies that the location update procedure has

been completed by transmitting the LU Confirm to the ACR.

(6)~(7) The RAS notifies the new CMAC_KEY_COUNT value updated by MS to the

ACR, which is an authenticator.

(8) The ACR sends the LU Confirm message and is notified that the location update

procedure is completed.

Inter-ACR Location Update (Anchor Relocation)

When the MS in the Idle mode moves to other ACR area, the Inter-ACR Location Update

(LU) procedure is performed. At this time, the procedure is different depending on whether

the MIP-based CMIP/PMIP method or the simple IP method is used.

RAS 1

(PG 1)

ACR

1) MOB-PAG_ADV

5) RNG-RSP

(Location Update Response)

RAS 2

(PG 2)

1) MOB-PAG_ADV

2) RNG-REG

(Location Update Request, Paging Controller ID)

3) LU Request

4) LU Response

6) CMAC_Key_Count_Update

7) CMAC_Key_Count_Update_Ack

8) LU Confirm