Cisco ASR 5000 Series - Page 224

ASN Paging Controller and Location Registry Overview
▀ Introduction
▄ Cisco ASR 5000 Series Product Overview
OL-22938-02
Figure 66. Location Update Flow
ASN BS
ASN-GW/
Local-PC
MS/SS
1
2
3
5
4
ASN-GW/PC/
Authenticator/DPF
Serving ASN
6
7
9
10
8
Anchor ASN
Table 47. Location Update Procedure Flow Description
Step
Description
1
The MS initiates a secure Location Update procedure by sending a RNG-REQ message to serving ASN BS, which includes
the Ranging Purpose Indication TLV set to indicate Idle Mode Location Update, the PC ID TLV which points to the anchor
ASN Gateway acting as the anchor PC function for the MS, and the HMAC/CMAC tuple.
2
The serving ASN BS sends an R6 LU_Req message to the serving ASN Gateway and starts timer TR6_LU_Req. The
message may include the PG ID, Paging Offset, and Paging Cycle TLVs if the serving ASN BS proposes an update to these
parameters.
3
The serving ASN Gateway (associated with the local Paging Controller) sends an R4 LU_Req message to the anchor PC
(associated with Anchor ASN Gateway) and starts timer TR6_LU_Req. The message may include the PG ID, Paging
Offset, and Paging Cycle TLVs if the serving ASN Gateway proposes an update to these parameters. Note: This message
may be relayed by several intermittent ASNs before reaching the anchor PC (Anchor ASN Gateway).