Message Relay In Asn - Cisco ASR 5000 series Product Overview

ASN Gateway Overview

Message Relay in ASN

The ASN Gateway provides relay procedures to send or distribute received messages with responses from a base station
or another ASN Gateway. Supported types of relay functions are:
Passive Relay: In this type of message relay, when the ASN Gateway receives a message on an R4 or R6
interface, it retrieves the destination ID and forwards the same request message to the given destination.
Active Relay: In this type of message relay, upon receiving the message on R4/R6 interface, the ASN Gateway
creates a similar R4/R6 message on the basis of original message and relays it to the destination. For example,
if during the inter-ASN Gateway handover a non-anchor ASN Gateway receives the data path registration
request from the target base station, it creates a new data path registration request and sends it to the anchor
ASN Gateway. After receiving the duplicate message, the anchor ASN Gateway sends the data path
registration response to the non-anchor ASN Gateway. When it receives that message, the non-anchor ASN
Gateway creates a new response message and sends the new data path registration response to the target base
station.
ASN Gateway Architecture and Deployment Profiles
The ASN Gateway is part of the Access Service Network (ASN) within the WiMAX network. The ASN Gateway
comprises logical and functional elements that provide different functionality in an ASN.
ASN profiles provide a framework for interoperability among entities within an ASN. At a high level, the WiMAX
forum has defined groups of functionality for an ASN. These are called Profile Mappings A, B, and C. The key
attributes of the profile mappings are:
ASN Profile-A
Profile-B: ASN Profile-B removes the ASN Gateway altogether and pushes all its functionality into the base
station. This functionality includes the following:
Profile-C: ASN Profile-C functionality is a subset of Profile-A with following functionality in Base Station:
The ASN Gateway supports ASN Profile-C functionality. Form more information on supported features and
functionality, refer to the Supported Feature section.
The following figure shows the mapping of functional entities in an ASN Gateway for Profile-C.
OL-22938-02
Handover control and Radio Resource control (RRC) in the ASN Gateway
ASN anchored mobility among base stations using R6 and R4 reference points
CSN anchored mobility among ASNs using PMIP/CMIP (R3)
Paging Controller and Location Register in the ASN Gateway
Radio Resource control (RRC) handling within the base station
R3 reference point
R4 reference point
HO control
Radio Resource Controller (RRC)
ASN Gateway in a WiMAX Network ▀
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