Gprs; Gprs Functionality; Gprs Commands - Fibocom G510 User Manual

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12GPRS

12.1GPRS Functionality

GSM 07.07 defines commands that a TE may use to control a GPRS ME via a non-multiplexed
character-stream interface. This places certain limitations on the functionality of the interface. For
example, it is not possible for the ME to send control information to the TE or for the TE to send
commands to the ME whilst the interface is in the online data state, unless the layer 2 protocol itself
supports this feature (GSM 07.60-12). However, Module-specific escape mechanism (DTR) is provided to
enable the TE to switch the Module into limited online command state.
The use of a multiplexed interface, (GSM 07.10), is not considered here (See "RS232 Multiplexer
Feature"). The Module-specific escape mechanism use DTR as an escape signal (following &D
parameters) and designed for limited non network related commands. This specific mechanism purpose
is to give the user a way to retrieve the signal strength. The time limit of consecutive DTR toggles is a
minimum of 90 seconds. The Module-specific is not designed to support online command and data states
both at the same time, therefore any wrong or extreme usage can cause unexpected behaviors. The
basic GPRS concept is be "always connected" and there is no charge for being connected (only per real
data transferred).

12.2GPRS Commands

This section defines commands that a terminal may use to control a GPRS ME. GPRS MTs vary widely in
functionality. A class A ME might support multiple PDP-types as well as circuit-switched data, and use
multiple external networks QoS profiles.
At the other extreme, a class C ME might support only a single PDP-type using a single external network,
and rely on the HLR to contain the PDP context definition. A comprehensive set of GPRS-specific
commands is defined below to provide the flexibility needed by the more complex ME.
The commands are designed to be expandable to accommodate new PDP types and interface protocols,
merely by defining new values for many of the parameters. Multiple contexts may be activated if the
interface link-layer protocol is able to support them. The commands use the extended information and
error message capabilities described in this specification. For MTs of intermediate complexity, most
commands have simplified forms where certain parameters may be omitted .
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