7 Jun
2010
7 Jun
'10
3:51 p.m.
Well guys,
Just being curious, are there any plans for UMTS support?
I remember Harald said something about an ASN.1 PER was an obstacle to
start for UMTS support.
Are there also nanoBTS for UMTS, I only know of 2G devices...
It was just quite on the list :p
Greetz,
Nordin :-)
7 Jun
7 Jun
9:21 p.m.
On Mon, Jun 07, 2010 at 03:51:29PM +0200, Nordin wrote:
Just being curious, are there any plans for UMTS
support?
There are lots of plans but only 24 hours per day and very few developers.
So as soon as you or anyone else starts working on it, we will be happy
to merge it :)
I remember Harald said something about an ASN.1 PER
was an obstacle
to start for UMTS support.
ASN.1 PER makes things a bit more uncomfortable but its definitely possible
nonetheless. Either by implementing those few message types by hand as
hex-coded templates in C, or by using a Erlang program linked to a C process
(the C interface for sending/receiving messages to/from Erlang processes is
quite small and easy to use) or by adding the respective bits to asn1c.
Are there also nanoBTS for UMTS, I only know of 2G
devices...
It was just quite on the list :p
Well, there are various 3G femtocells out there, including Alcatel/Lucent model
(using RANAP), Ubiquisys (using UMA) and ip.access/Cisco using URSL.
--
- Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/
============================================================================
"Privacy in residential applications is a desirable marketing option."
(ETSI EN 300 175-7 Ch. A6)
8 Jun
8 Jun
2:32 p.m.
Ok guys,
Does anyone has a Node B <---> RNC trace to analize it in Wireshark?
Especially for an ipaccess BTS (or Node B) as there's a good chance to
purchase one.
I saw one I'm interested in that has a productnr: 206 A from ipaccess.
If someone already played with such device can provide me a pcap trace,
I'll study it and can give a try to kickstart UMTS support :p
Peace.
9 Jun
9 Jun
8:18 a.m.
On Tue, Jun 08, 2010 at 02:32:52PM +0200, Nordin wrote:
If someone already played with such device can provide
me a pcap
trace, I'll study it and can give a try to kickstart UMTS support
:p
You can look at the USRL dissector that is part of the wireshark sources that
ip.access had to release under GPL. You can find it at
http://ftp.gpl-devices.org/pub/vendors/ipaccess/wireshark/
--
- Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/
============================================================================
"Privacy in residential applications is a desirable marketing option."
(ETSI EN 300 175-7 Ch. A6)
8:35 p.m.
I have some experience with ASN.1 coding/decoding, but not with PER, and I
have no experience with any 3gpp or mobile documents or standards.
I'm interested to look at ASN.1 PER encoding in spare time, if someone can
point me to documents that explain where ASN.1 is used (the purpose), and to
point me to documents that holds ASN.1 syntax needed for this purpose.
On Mon, Jun 7, 2010 at 3:51 PM, Nordin <bouchtaoui(a)gmail.com> wrote:
Well guys,
Just being curious, are there any plans for UMTS support?
I remember Harald said something about an ASN.1 PER was an obstacle to
start for UMTS support.
Are there also nanoBTS for UMTS, I only know of 2G devices...
It was just quite on the list :p
Greetz,
Nordin :-)
10 Jun
10 Jun
12:42 p.m.
On 9-6-2010 20:35, Milos Prodanovic wrote:
I have some experience with ASN.1 coding/decoding, but
not with PER, and I
have no experience with any 3gpp or mobile documents or standards.
I'm interested to look at ASN.1 PER encoding in spare time, if someone can
point me to documents that explain where ASN.1 is used (the purpose), and to
point me to documents that holds ASN.1 syntax needed for this purpose.
I'm currently studying the UMTS specs to get a general understanding and
focus on the Iub interface part to find the basic messages that are
similar to the OML/RSL part of GSM. As far as I understand there are
parts, if not all, of the messages encoded in ASN.1 PER, even unaligned
as Harald already told us before. I don't know much of the details,
maybe Harald can put more light on this.
You might want to experiment with PER encoded messages to play with and
on the wiki you can find pdfs about ASN.1 and PER.
http://en.wikipedia.org/wiki/Packed_Encoding_Rules
But at the moment I found these interesting docs about Iub interface,
that's like the GSM's Abis interface for UMTS:
http://www.3gpp.org/ftp/Specs/archive/25_series/25.430/25430-650.zip
http://www.3gpp.org/ftp/Specs/archive/25_series/25.433/25433-6h0.zip
(this is a huge file, almost 1000 pages!)
http://www.3gpp.org/ftp/Specs/archive/25_series/25.435/25435-650.zip
http://www.3gpp.org/ftp/Specs/archive/25_series/25.427/25427-680.zip
As far as I understand we can divide Iub into two networklayers, one is
the Radio Network Layer and the other is Transport Network Layer.
According to the specs the Tansport Network Layer is based on ATM/AALx
/etc.. or SCTP/IP combination, but I assume ip.access's 3G femtocell
(the one I want to focus on) is just based on tcp/ip, just like the nanobts.
The Radio Network Layer can be split in two parts, the Control Plane and
the User Plane. The Control Plane is based on NBAP which is doing
signaling for Node B, just like OML for the BTS. So I think that's an
important part to start with as this part is to control the Node B to
get it on the air.
The other part is the User Plane and is based on Common channels and
Dedicated channels, comaparable with the RSL layer.
Also for those who didn't know yet, UMTS doesn't work with
channels/timeslots like GSM, it works with so called cells. I don't know
the details yet, but what I remember is that you have to configure each
cell for a certain purpose, like DCH, PCH etc...
That's what I found about the UMTS so far, if I misunderstood some
things about the UMTS, don't hesitate to correct me. If someone can add
more information about it in plain English, that would be great, cause
all the new acronyms makes me a bit dizzy.
Peace...
On Mon, Jun 7, 2010 at 3:51 PM,
Nordin<bouchtaoui(a)gmail.com> wrote:
Well guys,
Just being curious, are there any plans for UMTS support?
I remember Harald said something about an ASN.1 PER was an obstacle to
start for UMTS support.
Are there also nanoBTS for UMTS, I only know of 2G devices...
It was just quite on the list :p
Greetz,
Nordin :-)
5:51 p.m.
was also looking on the Iub specs today and my head hurts :(.
For femtos the default interface would be Iuh, which from what I
understand is the Home Node B adapted version of the NodeB Iub. Then
you'd need a sort of Access Controller in the form of an Home Node B
Gateway as the next hop, but otherwise it seems to be less of packaging
hassle, or?
http://www.tech-invite.com/Ti-3gpp-standards-25b.html#ts-25444 - data
transport in 10 pages, CS with RTP multiplexed in UDP/IP, PS with
GTP-U/UDP/IP
http://www.tech-invite.com/Ti-3gpp-standards-25b.html#ts-25468 - RANAP
User Adaptation - SCTP/IP
http://www.tech-invite.com/Ti-3gpp-standards-25b.html#ts-25469 - Home
Node B Application Part - SCTP/IP
I was wondering if you looked at this too...
I know that Iub would be the real deal and fortunately this femto has it
too. Also probably the advantages are offset but what you loose by
requiring one more box, the Home Node B Gw.
Cheers,
-Dragos
Nordin wrote:
On 9-6-2010 20:35, Milos Prodanovic wrote:
--
Best Regards,
Dragos Vingarzan
I have some experience with ASN.1
coding/decoding, but not with PER,
and I
have no experience with any 3gpp or mobile documents or standards.
I'm interested to look at ASN.1 PER encoding in spare time, if
someone can
point me to documents that explain where ASN.1 is used (the purpose),
and to
point me to documents that holds ASN.1 syntax needed for this purpose.
I'm currently studying the UMTS specs to get a general understanding
and focus on the Iub interface part to find the basic messages that
are similar to the OML/RSL part of GSM. As far as I understand there
are parts, if not all, of the messages encoded in ASN.1 PER, even
unaligned as Harald already told us before. I don't know much of the
details, maybe Harald can put more light on this.
You might want to experiment with PER encoded messages to play with
and on the wiki you can find pdfs about ASN.1 and PER.
http://en.wikipedia.org/wiki/Packed_Encoding_Rules
But at the moment I found these interesting docs about Iub interface,
that's like the GSM's Abis interface for UMTS:
http://www.3gpp.org/ftp/Specs/archive/25_series/25.430/25430-650.zip
http://www.3gpp.org/ftp/Specs/archive/25_series/25.433/25433-6h0.zip
(this is a huge file, almost 1000 pages!)
http://www.3gpp.org/ftp/Specs/archive/25_series/25.435/25435-650.zip
http://www.3gpp.org/ftp/Specs/archive/25_series/25.427/25427-680.zip
As far as I understand we can divide Iub into two networklayers, one
is the Radio Network Layer and the other is Transport Network Layer.
According to the specs the Tansport Network Layer is based on ATM/AALx
/etc.. or SCTP/IP combination, but I assume ip.access's 3G femtocell
(the one I want to focus on) is just based on tcp/ip, just like the
nanobts.
The Radio Network Layer can be split in two parts, the Control Plane
and the User Plane. The Control Plane is based on NBAP which is doing
signaling for Node B, just like OML for the BTS. So I think that's an
important part to start with as this part is to control the Node B to
get it on the air.
The other part is the User Plane and is based on Common channels and
Dedicated channels, comaparable with the RSL layer.
Also for those who didn't know yet, UMTS doesn't work with
channels/timeslots like GSM, it works with so called cells. I don't
know the details yet, but what I remember is that you have to
configure each cell for a certain purpose, like DCH, PCH etc...
That's what I found about the UMTS so far, if I misunderstood some
things about the UMTS, don't hesitate to correct me. If someone can
add more information about it in plain English, that would be great,
cause all the new acronyms makes me a bit dizzy.
Peace...
On Mon, Jun 7, 2010 at 3:51 PM,
Nordin<bouchtaoui(a)gmail.com> wrote:
Well guys,
Just being curious, are there any plans for UMTS support?
I remember Harald said something about an ASN.1 PER was an obstacle to
start for UMTS support.
Are there also nanoBTS for UMTS, I only know of 2G devices...
It was just quite on the list :p
Greetz,
Nordin :-)
5496
days inactive
5499
days old
6 comments
4 participants
participants (4)
-
Dragos Vingarzan -
Harald Welte -
Milos Prodanovic -
Nordin