Sony Ericsson GR64 GSM, GSM, DCE, DTE, DCE, DTE, ENGINE, ENGINE, 2.2 Wireless modems in a Communication System

2.2 Wireless modems in a Communication System

Figure 2.2-1 and Figure 2.2-2 illustrate the main blocks of a wireless communication system using the wireless modem. Figure 2.2-1 shows the communication system when the script is embedded on the wireless modem and Figure 2.2-2 shows the communication system when a micro-controller is used. They also show the communication principles of the system and the interface between the wireless modem and the application. The definitions in the figures, as used elsewhere in this manual, are in accordance with the recommendations of 3GPP TS 27.007.

The MS (mobile station) represents the wireless modem and SIM card. The wireless modem excluding SIM card, is known as the ME (mobile equipment).

The DTE (data terminal equipment) is the controlling application. This can be either an external host or an internal embedded application.

The DCE (data circuit terminating equipment) is the serial communication interface of the MS.

MS

SIM

DC

POWER

INTERFACE SYSTEM

SIM	GSM
	NETWORK

GSM

GSM

ENGINE

ENGINE

STATUS &

RESPONSE EMBEDDED

APPLICATION

DCE	DTE
DCE	DTE

COMMAND & CONTROL

Figure 2.2-1 Main Blocks in a Wireless System (embedded application)

LZT 123 1834 12