Intra-Anchor Asn Gateway Controlled Handover - Cisco ASR 5000 series Product Overview

ASN Gateway Overview
Step Description
4 Serving ASN BS sends Context-Report message with MS context information to anchor ASN Gateway.
5 Anchor ASN Gateway forwards Context-Report message with MS context information to target ASN BS.
6 Target ASN BS sends Path Registration Request to anchor ASN Gateway.
7 Anchor ASN Gateway replies with Path Registration Response to target ANS BS.
8 Target ANS BS sends ranging response with RNG_RSP message to MS.
9 Target ASN BS sends Path Registration Acknowledge to anchor ASN Gateway.
10 R6 GRE data path established between target ASN BS and anchor ASN Gateway and data flow starts.
11 Target ASN BS sends CMAC Key Count Update message to anchor ASN Gateway.
12 Anchor ASN Gateway replies with CMAC Key Count Update ACK message to target ASN BS.
13 Anchor ASN Gateway sends Path_De-Reg_Req message to release data path to serving BS.
14 Serving ASN BS sends Path_De-Reg_Rsp message to anchor ASN Gateway.
15 R6 GRE data path terminated between serving ASN BS and anchor ASN Gateway.

Intra-anchor ASN Gateway Controlled Handover

An intra-anchor ASN Gateway controlled handover consists of the following types and phases.
MS Initiated Intra-anchor ASN Gateway Controlled Handover
This section describes the intra-anchor ASN Gateway controlled handover between two base stations initiated by a
mobile station.
HO Preparation Phase
This is the initial phase for a controlled handover between two BSs.
The following figure and table describe the call flow for the steps involved in an uncontrolled intra-ASN Gateway
handover preparation phase between two BSs.
OL-22938-02
ASN Call Procedure Flows ▀
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