Cisco ASR 5000 series Product Overview page 231

ASN Paging Controller and Location Registry Overview
Table 50.
Step Description
1 MS decides to enter Idle Mode and sends DREG_REQ formatted as described in IEEE 802.16e.The De-Registration
Request code is set to 0x01 indicating that the MS intends to enter Idle Mode.
2 Based on the MS's request, the serving ASN BS (Paging Agent) in serving ASN sends an R6
IM_Entry_State_Change_Req message to its ASN Gateway. Timer TR4_IM_Entry_Req is started to monitor R6
IM_Entry_State_Change_Rsp at the serving ASN BS(PA).
3 The local Relay PC in Serving ASN Gateway chooses an anchor PC for the MS and sends inter-ASN R4
IM_Entry_State_Change_Req message to the Anchor ASN associated with the chosen anchor PC. Timer
TR4_IM_Entry_Req_ASN is started to monitor the R4 IM_Entry_State_Change_Rsp.
4 The anchor PC/LR, sends R4 IM_Entry_State_Change_Req to the anchor authenticator to verify whether the MS is
allowed to go into Idle mode. Timer TR4_IM_Entry_Req_APC is started at this time to monitor the R4
IM_Entry_State_Change_Rsp from the anchor authenticator. This step is optional if the anchor authenticator and anchor
PC/LR are collocated in the same ASN Gateway.
5 The anchor authenticator checks if the MS is allowed to enter Idle Mode and saves necessary information if allowed, then
sends back R4 IM_Entry_State_Change_Rsp to the anchor PC/LR including MSID, IDLE mode authorization indication.
If the anchor authenticator rejects the Idle mode entry request, the Idle Mode Authorization TLV contains the rejection
code. When R4 IM_Entry_State_Change_Rsp for MS entering Idle Mode is send successfully, The anchor authenticator
stores the anchor PC ID for this MS. Upon receipt of this message at the anchor PC, the TR4_IM_Entry Req_APC is
stopped. This step is optional if the anchor authenticator and anchor PC/LR are collocated in the same ASN Gateway.
6 According to the reported information in R4 IM_Entry_State_Change_Rsp, based on the content of Idle mode
authorization indication IE, the anchor PC updates the LR with current MS location information (PGID) and other
parameters, and sends back R4 IM_Entry_State_Change_Rsp message to the serving ASN Gateway. When this message is
received at the serving ASN Gateway, timer TR4_IM_Entry_Req_ASN is stopped.
7 Serving ASN Gateway forwards the R6 IM_Entry_State_Change_Rsp to serving BS (PA) including IDLE Mode
authorization indication and accepted Paging parameters. Upon receipt of this message at the BS, timer
TR6_IM_Entry_Req is stopped.
8 Serving ASN BS sends DREG_CMD to the MS. The DREG_CMD conveys PC ID field pointing to the anchor PC for the
MS and allocated Idle mode parameters.
9 After sending the DREG_CMD to the MS, the serving ASN BS (PA) acknowledges the successful delivery of
DREG_CMD to the local relay PC in the serving ASN Gateway by sending R6 IM_Entry_State_Change_Ack.
10, The local relay PC in the serving ASN Gateway forwards the successful entry of MS to Idle mode to the anchor PC in the
11 anchor ASN Gateway by sending an R4 IM_Entry_State_Change_Ack. Upon receipt of this message at the anchor PC,
timer TR4_IM_Entry_Rsp is stopped.
12 The anchor ASN Gateway associated with the anchor PC/LR updates the information of MS into LR database and sends an
Anchor PC Indication message to the anchor DPF/FA to reflect the success of MS entering Idle Mode. Timer
TR4_APC_Ind is started at this time when the anchor PC Indication is sent, to monitor the response.
13 The anchor DPF/FA finally updates the information of MS, including the anchor PC ID of this MS, and acknowledges to
the anchor PC/LR by an Anchor PC Ack message. When the Anchor PC Ack is received at the anchor ASN Gateway,
timer TR4_APC_Ind is stopped.
14 After the expiration of the Management Resource Holding Timer (an 802.16e parameter), the serving BS initiates the
related R6 data Path Dereg procedure by sending R6 Path_Dereg_Req to the anchor ASN Gateway.
OL-22938-02
MS Initiated Idle Mode Entry Procedure Flow Description
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