Cisco ASR 5000 Series - Page 193

ASN Gateway Overview
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Cisco ASR 5000 Series Product Overview ▄
OL-22938-02
Figure 54. Controlled Inter-ASN Gateway Handover Procedure - Preparation Phase
Serving
ASN BS
Anchor
ASN-GW
MS/SS
DATA
2
6
1
3
7*
9*
10*
11 *
12*
13
14
Target
ASN BS
Non-Anchor
Target ASN-GW
15
8*
5
4
Table 38. Controlled Inter-ASN Gateway Handover Procedure - Preparation Phase Description
Step
Description
1
MS sends a MOB_MSHO-REQ message to the serving ASN BS.
2
Serving ASN BS sends a Handover Request message to the target ASN BS.
3
Target ASN BS sends a Context-Request message to the target non-anchor ASN Gateway for this MS.
4
Target non-anchor ASN Gateway forwards the Context-Request message to the anchor ASN Gateway.
5
Anchor ASN Gateway sends a Context-Report message to the target non-anchor ASN Gateway.
6
Target non-anchor ASN Gateway forwards the Context-Report message to the target ASN BS.
7
Target ASN BS sends a Path Pre-Registration Request message to the target non-anchor ASN Gateway. Pre-registration is
optional.