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Multiple APN Scenarios

  • Article

4/8/2010

Simultaneous and Serialized Multiple APN Scenarios

Simultaneous Multiple APN Scenario

  • The device can support simultaneous multiple APNs active and has two different APNs configured – one for Internet and another for MMS.
  • The user wants to send a picture via the MMS application which requests Connection Manager for a connection.
  • Connection Manager determines based on pre-provisioned XML that the MMS application must always use the MMS APN.
  • Connection Manager ensures that any socket opened by the MMS application automatically uses the IP interface corresponding to the MMS APN.
  • The user simultaneously starts the browser application that makes a connection request to Internet and it automatically uses the Internet APN that is the current default network of choice to connect to Internet.

Serialized Multiple APN Scenario

  • The device supports only one active APN connection at any given time and has two different APNs configured – one for Internet and another for MMS.
  • The user wants to send a picture via the MMS application which requests Connection Manager for a connection.
  • Connection Manager determines based on pre-provisioned XML that the MMS application must always use the MMS APN.
  • Connection Manager ensures that any socket opened by the MMS application automatically uses the IP interface corresponding to the MMS APN.
  • The user starts the browser application that makes a connection request to Internet. If the browser application connection request has higher priority, then Connection Manager automatically tears down the MMS APN connection and enables the Internet APN connection for the browser to connect to Internet.

Multiple APN Support and Applications Scenarios

Interaction with Voice

  • Interaction with Voice with multiple simultaneous contexts is the same as with single context. That is, on non-Simultaneous Voice Data (SVD) network.
  • Suspend/resume (S/R) capable connections will not be torn-down during voice calls but will be suspended. Application s that have an active connection request with Connection Manager using a suspended connection will be notified when the state of the connection changes from connected to suspended. These applications will be notified again when the connection is state is restored to connected.
  • Non-S/R connections will be torn-down during voice call. Applications that had an active connection request with Connection Manager that used the disconnected connection will be notified of the connection state change.
  • Connection requests for which Connection Manager chose a connection path that uses S/R or non-S/R connections will not be established during voice call. The status returned to application sending the connection request will be CONNMGR_STATUS_WAITINGFORPHONE. Once the voice call is disconnected, the affected connection requests will be re-evaluated and possibly connected.

On a SVD network, S/R capable connections will remain in connected status during voice call and those connections may be established during voice call. The behavior of non-S/R connections will remain as above.

Interaction with Internet Sharing

  • Like other Connection Manager-aware applications, Internet Sharing will open a connection request with Connection Manager for the connection selected by the user to be shared with the desktop (over USB RNDIS or BT). The connection used by Internet Sharing will be shared by the desktop and also by other applications running on a device provided that it can be used to satisfy these applications. To prevent the connection from being shared by applications running on device, it is sufficient to make the connection connect to a custom network that other applications will not be interested in connecting to.
  • By default, Internet Sharing opens a connection request which has the same priority as CONNMGR_PRIORITY_USERBACKGROUND to eliminate conflicts with user interactive applications. The Internet Sharing connection request will not be connected (remain in a waiting connection state) over a requested connection, if a higher priority connection request is using the radio to connect to a different APN. However, if the radio supports multiple simultaneous contexts, then the two connection requests may be connected simultaneously to different APNs.
  • The priority of the connection request used by Internet Sharing can be adjusted through registry setting.
  • The connection Request used by Internet Sharing is suspend-aware, that is it supports the suspended state of a connection, and will inform the user if a connection is suspend.

See Also

Other Resources

Multiple APN Support