WLAN has only realized network access but not achieved network roaming, which is very important for expanding the fields of WLAN application.

WLAN只是解决了网络接入，并没有实现网络漫游，而漫游对拓宽WLAN的应用领域非常重要。

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The fundamental question is this: is a Linux system capable of integrating with other access points in a wireless network to provide connectivity between fixed nodes and roaming wireless clients?

基本的问题是：Linux系统是否有能力与无线网络中的其他接入点相结合，来为固定节点和漫游的无线客户机提供连接？

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Provisioning system: Used to activate the customer's desired network services (that is, roaming, 3g, and so on).

供应系统：用于激活客户所需的网络服务(即漫游、3g等)。

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Together the Hotspot 2.0 and WBA initiatives aim to create advanced Wi-Fi hotspot networks with an improved end-user experience for authentication, security, network selection and roaming.

FORBES: Making Wi-Fi '3G Secure' For Mobile Data Offloading

Globalgig is a unique service that removes the need for expensive roaming costs when accessing mobile broadband across its international network.

ENGADGET: Globalgig expands its roaming MiFi coverage into more English-speaking countries (plus Sweden and Denmark)

If Clearwire can upgrade its network form WiMax to TDD LTE (85% similar technology) as scheduled and China Mobile (650 million Subs) finalizes a deal with Apple while completing their TDD LTE network, then Sprint will have a game changing world iPhone capable of roaming from FDD to TDD LTE.

FORBES: AT&T CMO: This Is How We Sold Millions More iPhones Than Verizon In 2011