User Manual

Table Of Contents
Packet switched services
7-22 Confidential - For internal use 99-137719-D
7.6.5 List of AT commands for manipulating PDP family QoS
This subsection lists the subset of 3GPP AT commands used to manipulate QoS and
other parameters for a given PDP context.
AT+CGDCONT - defines a PDP context.
AT+CGDSCONT - defines a secondary PDP context.
AT+CGEQREQ - requests a QoS for a given PDP context.
AT+CGEQMIN - requests a minimum QoS for a given PDP context.
AT+CGTFT - defines (TFTs) Traffic Flow Templates for given PDP context family.
AT+CGACT - activates a PDP context
Example:
AT+CGDCONT=2,ip,bgan.inmarsat.com
AT+CGEQREQ=2,3
AT+CGDSCONT=5,2
AT+CGEQREQ=5,1,32,32,32,32
AT+CGTFT=5,1,1,,1
AT+CGACT=1,2
This sequence makes the following happen:
1. A primary PDP context with cid 2 is created.
2. A PDP context with cid 2 is configured as a background connection.
3. A secondary PDP context with cid 5 is created, with primary PDP context with cid 2 as
its “parent”.
4. This secondary PDP context (cid 5) is configured as a Streaming 32 connection with a
QoS of 32 Kbit/s constant bit rate.
5. A TFT is set up for PDP context with cid 5 with identifier 1, evaluation precedence 1,
sending everything with IP protocol number 1 (ICMP traffic) across this PDP context.
6. Finally the PDP contexts are activated.
For more detailed documentation of the AT commands, see the relevant 3GPP
specification in ‘3GPP TS 27.007, AT Command set for User Equipment (UE)’ [1].
7.6.6 Link metrics monitoring via PPPoE PADQ message
RFC 2516 [19], the original description of PPPoE, has been extended by RFC 4938 [20]
with extension for credit flow and link metrics. From this RFC the RM implements the
PPPoE Active Discovery Quality (PADQ) message.
This means that the RM client can send a PADQ query message and in return it will get
a PADQ message containing the current Tx data rate and the maximum Tx data rate.
The RM internally updates these values every 80 milliseconds.