As a first step to enable roaming, two WiMAX operators which desire to provide roaming service on each others’ networks must share information about their specific requirements and capabilities. This is an important step in determining whether their networks will support roaming services for each others’ subscribers. This includes information regarding frequency bands, devices, services and protocols. For example, devices of a WiMAX operator must be capable of operating on the frequencies and within the channel bands of their roaming partner. Two operators must also agree on services to be provided, IP address assignment mechanism, method of interconnection and the format and method for sharing information to track subscriber usage and to exchange information required for billing and settlement.
The following is a check list of items to be completed in order to implement roaming.
Identify and contact roaming partners.
Operator Information – to be shared with potential roaming partners to determine compatibility for roaming (see list below).
Decide whether roaming will be through a direct connection with the roaming partner or via a third-party roaming exchange provider (WRX). If through a WRX, establish relationship with WRX provider.
Use WiMAX Roaming Guidelines and Roaming Specifications as reference in ensuring your network is roaming capable.
Establish a Roaming Agreement with roaming partner. (Roaming Agreement Template)
Establish connectivity with roaming partner.
Test roaming service (Test Plan).
Source: WiMAX Roaming