User's Manual

Mobile WiMAX RAS SPI-2L10 System Description/Ed.00

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4.1.4 Location Update

Inter-RAS Location Update

The figure below shows the location update procedure performed when the MS moves to

another paging group in the same ACR.

Figure 4.8 Inter-RAS Location Update Procedure

Category Description

(1) When the MS in Idle mode moves from paging group 1 to paging group 2, it receives

the PAG-ADV message and thus recognizes that its location has changed.

(2)~(3) To request the location update, the MS sends the new RAS (RAS 2) the RNG-REQ

message containing the MAC address, Location Update Request, and Paging

Controller ID. Then RAS 2 sends the Location Update Request message to the ACR.

(4)~(5) The ACR sends RAS 2 the Location Update Response message containing paging

information, AK Context information, etc. The RAS 2 checks the validity of the CMAC,

and then sends the MS the RNG-RSP message containing the LU Response.

(6)~(7) The RAS notifies the ACR, which is the authenticator, of the new

CMAC_KEY_COUNT value updated by the MS.

(8) The ACR sends the LU Confirm message to provide notification that the location

update procedure has finished.

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-REQ

(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