Zte ZXSDR R8860, Техническое руководство

Страница: 52 / 60

ZXSDR R8860 Technical Manual
The Default Packet Application provides a byte stream to transmit packet data
between the terminal and the network. It includes three protocols.
à
Flow Control Protocol provides the flow control function for data stream.
à
Radio Link Protocol implements byte stream retransmission and duplicate packet
detection, and provides a reliable data link for upper applications.
à
Location Update Protocol provides location update program and corresponding
messages for mobility management of packet application.
l Stream layer
The stream layer delivers the following functions:
à
It provides the architecture of data packets over the connection application layer
by means of data stream authentication.
à
It distinguishes priorities signals and user services according to the data
encapsulation protocol of the connection layer.
à
It connects users to signal service.
à
It allocates independent data stream to applications of different QoSs.
l Session layer
The session layer contains a series of protocols used for session negotiation between
the terminal and the network. In the 1xEV-DO system, a session indicates a state
jointly maintained between Access Terminal (AT) and Access Network ( AN ). It includes
address UATI distributed to the terminal, protocol set determined by the terminal and
the network for air interface communication, protocol configurations in the protocol set
and current terminal location. The session layer defines three protocols:
à
Session Management Protocol activates other protocols on the layer, ensures
session validity and closes sessions.
à
Address Management Protocol manages terminal address (UATI) distribution.
à
Session Configuration Protocol (SCP) performs session flow negotiation. In the
1xEV-DO system, SCP negotiates the protocol used for communication between
the terminal and the network, and how to set protocol parameters.
l
Connection layer
The connection layer controls the air link state. In the 1xEV-DO system, an enabled
link between AT and AN means the AT is allocated with RPC, RTC and FTC (FTC is
the time division channel shared by all the subscribers with open connections in the
sector).
l
Security layer
The security layer delivers the following functions:
à
Key exchange. It provides a procedure for the terminal and the network to
exchange keys that are used for authentication and encryption.
3-4
SJ-20100722143906-001|08/30/2010 ZTE Proprietary and Confidential