>> So the spec says, ME PDN ACT can come even for an implicit
>> activation request associated with CGATT, which is the case with EPS.
>> For 3G, if this happens (ME PDN ACT) for UE initiated activation of
>> context, then the cid is already set with CGDCONT.
>> For EPS this can happen for default context, where cid is not set with
>> CGDCONT, but is in the range as returned by CGDCONT.
>> Here the cid issue, because cid is managed by ofono and is never
>> communicated to modem. Probably to avoid sending too many CGDCONT's
>> during startup. or is it something else?
>> I thought the default context activation will come to TE as NW ACT,
>> a cid not in range of CGDCONT.
> Exactly so the idea to avoid any issue was to call
ofono_gprs_set_cid_range from the driver with a range which doesn't
include the CID used for initial EPS context.
> Normaly we know from the modem vendor which CID will be used for the
initial EPS context.
> For instance if +CGDSCONT=? Is returning 1-25 as range then we call
ofono_gprs_set_cid_range with 2-25 as range assuming that CID 1 will be
used for the initial EPS context.
Ok so you are assuming that cid 1 will be always used for default
context, and so this is work around for the issue.
The modem vendor should know which CID will be used for the initial default context.
So the idea was to add a requirement in the implementation of the gprs drivers that
ofono_gprs_set_cid should be called with a range that's doesn't include the CID
used for the initial default bearer.
From what I know there is nothing in the spec saying which CID to use
for initial default context.
And there is no standard AT commands to specify
settings to use for the initial default context (CID, APN, user , password , IPV4/IPV6/
Instead we could also expect it to have a unique id.
I still feel that the default context should be a NW initiated context
and will have a unique cid.
As Pessi said before the PDN connectivity request is UE initiated.
-- 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. --
Also why can't the context id management be done in modem instead
What do you mean by context id management be done in the modem ?
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