From: ofono-bounces(a)ofono.org [mailto:firstname.lastname@example.org] On Behalf Of
Sent: Wednesday, April 06, 2011 4:06 PM
Subject: Re: [RFC PATCH v3] gprs: add function to handle activated context
> Hi Arun,
> 2011/4/6 Arun Ravindran<ext-arun.1.ravindran(a)nokia.com>:
>> According to this, the cid of user initiated context and network
>> context doesn't overlap.
> The problem is, the initial EPS context is initiated by mobile, not by
> the network. The mobile sends a piggybacked
> PDN CONNECTIVITY REQUEST with the initial attach request in order to
> initiate the initial EPS context.
How does this happen from oFono (or in the TE-MT Interface).
It's triggered by AT+CGATT=1 (or AT+CFUN=1 if we have auto attach enabled).
Does it mean that in for EPS context the TE will have to do the same
steps what it does for GPRS?
For the EPS context (non initial) yes.
For the initial EPS context we don't use AT+CGACT and CGDCONT.
The PDN CONNECTIVITY REQUEST has the APN name, and for TE, CGDCONT to
set the APN is called with a context id, in that case what is the need
for the cid handling done in this patch?
In order to request connectivity to a PDN using the default APN, the UE includes the
Access point name IE in the PDN CONNECTIVITY REQUEST message or, when applicable, in the
ESM INFORMATION RESPONSE message, according to the following conditions:
- if use of a PDN using the default APN requires PAP/CHAP, then the UE should include
the Access point name IE; and
- in all other conditions, the UE need not include the Access point name IE.
For the initial EPS context the UE may have to provide the APN in some cases. From 27007
we don't have an at command such as AT+CGCONT to specify the parameter that'll be
used for the initial EPS context (like APN).
Regarding the patch, In 3G when you get the following unsolicited "ME PDN ACT
X" (where X is the CID, see +CGEREP) it's because you activated a context
In this case you already specified the CID with AT+CDCONT before AT+CGACT.
In LTE you can get this event in two cases; after the attach procedure (AT+CGATT) and in
this case you don't know the CID before, or after AT+CGDCONT and AT+CGACT as in 3G.
The idea was to propose a function to handle the first case with the initial EPS context.
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