Method Enabling Real-Time Data Service, Realization, Real-Time Data Service System and Mobile Terminal

A real-time data service system, adapted to provide a real-time data service for a mobile terminal, comprising:

• an AP, an authentication server and a real-time data service server;
• said AP being equipped with a first WAI unit and a first WLAN Privacy Infrastructure (WPI) unit;
• wherein the first WAI unit is adapted to interact with the mobile terminal and the authentication server, complete certificate authentication in a WAI protocol and negotiate with the mobile terminal to obtain a session key K;
• the first WPI unit is adapted to transmit a control signalling message for starting and controlling the real-time data service between the mobile terminal and the real-time data service server, and send an audio/video data message of the real-time data service sent by the real-time data service server to the mobile terminal after the real-time data service is started;
• wherein the control signalling message is encapsulated into the MPDU after being encrypted through the session key K, and then transmitted between the first WPI unit and the mobile terminal;
• and at least one audio/video data message is encapsulated into the MPDU in plaintext and sent to the mobile terminal by the first WPI unit.

A mobile terminal, being equipped with a second WAI unit, a second WPI unit and a real-time data service application unit;

• wherein
• the second WAI unit is adapted to interact with an AP and an authentication server in a real-time data service system, to complete certificate authentication in a WAI protocol, and to negotiate with the AP to obtain a session key K;
• the real-time data service application unit is adapted to send a control signalling message for starting and controlling a real-time data service to a real-time data service server of the real-time data service system through the second WPI unit, and receive a control signalling message from the real-time data service server;
• and the real-time data service application unit is adapted to receive, after the real-time data service is started, an audio/video data message of the real-time data service sent by the real-time data service server through the second WPI unit, and play audio/video data encapsulated in the message;
• and
• the second WPI unit is adapted to receive a control signalling message sent by the real-time data service application unit, encrypt the control signalling message by using the session key K and encapsulate the encrypted control signalling message into an MPDU, and then send the encapsulated control signalling message to the real-time data service server through the AP;
• and the second WPI unit is adapted to use, after receiving the control signalling message which is encrypted and encapsulated in the MPDU and sent by the real-time data service server through the AP, the session key K to decrypt the control signalling message, and send the decrypted control signalling message to the real-time data service application unit.