Samsung Mobile WiMAX Outdoor RAS SPI-2331, System Description

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Mobile WiMAX Outdoor RAS SPI-2331 System Description/Ed.02
© SAMSUNG Electronics Co., Ltd. 4-9
Idle Mode
Æ
Awake Mode(QCS)
When an MS in Idle Mode responds for the paging because of incoming traffic or sends the
traffic, the status of MS is changed from the Idle Mode into Awake Mode. In both cases,
the MS should perform the network re-entry procedure to change the status into the Awake
Mode and the Mobile WiMAX system of Samsung basically takes account of the QCS
procedure as the network re-entry method.
The following is the case where the mode is changed from the Idle Mode to the Awake
Mode at the time of the Network re-entry(QCS).
Figure 4.6 Idle Mode
Q
Awake Mode (QCS) Procedure
Classification Description
(1) If the Idle Mode MS is changed into the Awake Mode, the MS creates the RNG-
REQ message including the MAC address and the Paging Controller ID value
and transmits the message to the RAS. Then, the value of the Ranging Purpose
Indication field is set as 0x00(=Network Re-entry).
(2)~(3) The RAS creates the IM Exit State Change Request message including the
parameter of the received RNG-REQ message and transmits the message to the
ACR. The ACR checks the status information of the Idle Mode of the MS, creates
the IM Exit State Change Response message including the Idle Mode Retain
information to perform the QCS procedure and the AK Context information for
the CMAC authentication and transmits the message to the RAS.
(4)~(5) The RAS transmits the Path Registration Request message including the data
path information such as the(UL) GRE Key to the ACR to set the data path with
the ACR. The ACR responds to the RAS as the Path Registration Response
message including the data path information such as the(DL) GRE Key for this.
(6) The RAS replies with the RNG-RSP message along with HO Optimization Flag
for the QCS and relevant CID_Update and SA-TEK_Update information.
(7)~(8) The RAS notifies the new CMAC_KEY_COUNT value updated by the MS to the
ACR, which is an authenticator.
1) RNG-REQ
2) IM Exit State Change Request
(PC ID, Ranging Purpose=0)
3) IM Exit State Change Response
4) Path Reg Request
5) Path Reg Response
9) Path Reg Ack
6) RNG-RSP
(CID Update)
10) BW Request Header
11) ACR
12) ACA
MS RAS ACR AAA
7) CMAC_Key_Count_Update
8) CMAC_Key_Count_Update_Ack