subject: How To Test With Uma / Gan [print this page] To predict the performance of customer acceptance of a mobile phone to predict the quality of mobile phone design, the need for actual testing. Use test is a valuable tool, this article describes how to conduct such tests.
UMA / GAN is a mobile phone allows the transmission of voice, data, both data and voice have neither voice nor data in cellular networks (such as GERAN--GSM/EDGE radio access network) and IP access into the network (eg wireless LAN) switch seamlessly between the systems. As network convergence a milestone in the development of technology, UMA / GAN enables mobile users to enjoy the services provided by fixed broadband networks. UMA / GAN originally called Unlicensed Mobile Access (UMA) network, was later renamed the 3GPP Generic Access Network (GAN), this paper these two techniques referred to as GAN1.
3GPP Technical Specification 43.318 and 44.3182,3 described GAN system architecture and protocols. A phone must have been tested to meet these standards can be put on the market. But before that, there are many opportunities for mobile developers to test their products on the GAN standard consistency. Early verification processing of data and voice phone capability will greatly improve the product successfully passed the conformance test probability. Such as GAN
Even for a relatively mature technology, designers can still be achieved by providing a unique performance of product differentiation. WLAN is a technology widely used in mobile phones, which can used to implement VoIP, also be used as a data modem. GAN key factors affecting the use of one IP network and seamlessly switch between cellular networks, this program alone is unable to provide WLAN functionality.
Network components GAN system also GERAN / UTRAN network architecture to add a new component: GAN controller, referred to GANC. GANC functionally equivalent to a typical base station controller GERAN network (BSC). But the difference is with BSC, GANC is the front-end IP access network connection, and through this interface (called the uplink interface) using GAN-specific protocols and mobile communications. To ensure the phone and the core network signaling and user data transfer between, GANC also responsible for the uplink interface, the message is converted to the current BSC / core network interface protocol (in the GSM case is BSSAP / BSSGP protocol).
Only can enjoy the GAN dual-mode phone service, meaning that when a user roaming access to Bluetooth or Wi-Fi network to be able to detect when the phone in order to GERAN / UTRAN mode and GAN switch between modes. Moreover, the phone must also be in the middle of a GAN-compliant security gateway (SEGW) in between themselves and service GANC an on IPSec (Internet Protocol confidentiality) of the VPN tunnels. Based mobile services such as data, voice and signaling services can be properly protected and transmitted through the tunnel.
How to create a GAN connection
During GAN network deployment usually takes several years to contribute to the GAN GANC business tasks, while ensuring load balancing. Network each GANC at least the following logic for an entity to provide services: configuration GANC (P-GANC), the default GANC (D-GANC) or services GANC (S-GANC).
Mobile users if there is a GAN-enabled mobile phone with only when the phone can be connected in its license-free wireless network coverage in order to use the phone when GAN features. Phone first attempt to establish a connection, you need to identify the default GANC (D-GANC). Therefore, it will start the discovery process, to receive the D-GANC information, and use the information during the registration process.
To get the address of D-GANC and its associated security gateway (SEGW) information, the phone through the P-GANC associated SEGW connected to its attribution to public land mobile network (HPLMN) in the configuration GANC. A default of the fully qualified domain name (FQDN) or IP address of the phone there should be the address of the P-GANC and associated SEGW, or cell phone can also be under the (U) SIM card information is FQDN. 3GPPTS 23.0035 on addressing requirements are described.
Next, cell phone with the D-GANC in SEGW establish a secure channel, and try to register through the D-GANC. The D-GANC registration if accepted, will become the connection of this S-GANC, otherwise, it will request the registration of mobile phones lead to another S-GANC. Even if a cell phone does not work in GAN mode can be sustained indefinitely in an S-GANC registration, the same time enjoy the GERAN / UTRAN services in order to take timely to voice and data network to switch to GAN. Once the phone explicitly switch to GAN network or the user to decide to switch to using the GAN, the mobile user's current location information (this information is stored in the core of the Internet) will be refreshed by phone, and then, voice / data and signaling traffic will be passed GANC and not sent to the mobile cellular network.
The role of the security gateway
GAN system is a crucial part of the security gateway (SEGW), its mobile phones and in the "unsafe" IP access network operators in the other end between the network provides a secure connection. GAN
In a typical deployment, SEGW responsible for the phone and GANC located between the core mobile network to establish and maintain a secure (encrypted by IPSec/IKEv2 standard) connection. GAN connection in the established, the phone must be signed security certificate on the security gateway public key authentication. This is to ensure that users of public IP access network using the GAN will not be in without the knowledge of "decoy" to other malicious network.
SEGW also as mobile phones and associated billing, authentication and authorization server (AAA) communication between the intermediary, the user authentication and allows them to use the network services provided by the GAN. AAA server to send to the phone's request / response password based on the results obtained certification of judgments, and forced to prove mobile phones and networks SIM or USIM card users to share enjoy privacy "k" value and the AAA server connected to the network Home Location Register information. In addition to mobile phones and network authentication, the authentication algorithm results can also be used for calculating the key information needed to communicate both to the phone and SEGW connection between the IPSec encryption.
Phone and AAA server, the authentication protocol between the 2G and 3G networks are not the same. 2G and 3G network authentication protocol used in both 2G and 3G-based authentication of existing technology, but often more vulnerable to strengthen the protection of IP access networks have made great improvements. 2G networks are used for the User Identity Module (EAP-SIM) of the extensible authentication protocol, which is used for 3G UMTS network authentication and key negotiation (EAP-AKA)
