[Bluez-users] packet types / speed (USB dongles)?

[Bluez-users] packet types / speed (USB dongles)?

[Lutz Pressler]

Hallo,

I've got CSR based USB dongles, for which hciconfig -a
gives "Packet type: DM1 DH1 HV1". Whatever HV1 is,
for DH1 http://www.holtmann.org/lecture/bluetooth/bt_primer.pdf
reports payload rates of around 180 kbit/s.
Now when querying the phone (Nokia 6230) I get as feature
<HV3 packets>.
Does this mean, that I could use e.g. DH3 with that phone
(390 kbit/s symmetric or 586 / 86 asymmetric)?
Which USB dongles would support that?

Lutz

-- 
  _              |  Lutz Pressler          |  Tel: ++49-551-3700002
 |_     |\ |     |  Service Network GmbH   |  FAX: ++49-551-3700009
 ._|ER  | \|ET   |  Bahnhofsallee 1b       |   mailto:lp@SerNet.DE
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Re: [Bluez-users] packet types / speed (USB dongles)?

[Marcel Holtmann]

Hi Lutz,

> I've got CSR based USB dongles, for which hciconfig -a
> gives "Packet type: DM1 DH1 HV1". Whatever HV1 is,
> for DH1 http://www.holtmann.org/lecture/bluetooth/bt_primer.pdf
> reports payload rates of around 180 kbit/s.
> Now when querying the phone (Nokia 6230) I get as feature
> <HV3 packets>.
> Does this mean, that I could use e.g. DH3 with that phone
> (390 kbit/s symmetric or 586 / 86 asymmetric)?
> Which USB dongles would support that?

every CSR based that I have seen so far supports every packet type from
the Bluetooth 1.1 specification. However you can set the used packet
types by yourself, but this makes no sense. Simply enable them all and
let the link manager decide what's the best to use. The HVx packets for
SCO audio links and don't matter for the data transfers over ACL.

Regards

Marcel




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Re: [Bluez-users] packet types / speed (USB dongles)?

[Lutz Pressler]

> every CSR based that I have seen so far supports every packet type from
> the Bluetooth 1.1 specification. However you can set the used packet
> types by yourself, but this makes no sense. Simply enable them all and
> let the link manager decide what's the best to use. The HVx packets for
> SCO audio links and don't matter for the data transfers over ACL.
Is it normal than that file transfer with obexftp to the phone is
not faster than 1 MB per minute?

Thanks,
  Lutz

-- 
  _              |  Lutz Pressler          |  Tel: ++49-551-3700002
 |_     |\ |     |  Service Network GmbH   |  FAX: ++49-551-3700009
 ._|ER  | \|ET   |  Bahnhofsallee 1b       |   mailto:lp@SerNet.DE
Service Network  |  D-37081 Goettingen     |  http://www.SerNet.DE/

Re: [Bluez-users] packet types / speed (USB dongles)?

[Marcel Holtmann]

Hi Lutz,

> > every CSR based that I have seen so far supports every packet type from
> > the Bluetooth 1.1 specification. However you can set the used packet
> > types by yourself, but this makes no sense. Simply enable them all and
> > let the link manager decide what's the best to use. The HVx packets for
> > SCO audio links and don't matter for the data transfers over ACL.
> Is it normal than that file transfer with obexftp to the phone is
> not faster than 1 MB per minute?

I never did any bandwith tests with OBEX, but actually the flow of
L2CAP<->RFCOMM<->OBEX gives you a big performance decrease of the 1 Mbit
bandwith of a piconet. But this must not be a problem of the dongle,
because both link managers must decide to use the correct packet type.
And of course the phone CPU must be fast enough to handle the RFCOMM and
OBEX protocol very well. There are more bottlenecks so this question is
not really easy to answer.

Regards

Marcel




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Re: [Bluez-users] packet types / speed (USB dongles)?

[Nicholas A. Preyss]

On  0, Lutz Pressler <Lutz.Pressler@SerNet.DE> wrote:
> I've got CSR based USB dongles, for which hciconfig -a
> gives "Packet type: DM1 DH1 HV1". Whatever HV1 is,
> for DH1 http://www.holtmann.org/lecture/bluetooth/bt_primer.pdf
> reports payload rates of around 180 kbit/s.
> Now when querying the phone (Nokia 6230) I get as feature
> <HV3 packets>.
> Does this mean, that I could use e.g. DH3 with that phone
> (390 kbit/s symmetric or 586 / 86 asymmetric)?
> Which USB dongles would support that?

HV* are packets of an SCO connection. My understanding of the
specification ist that the speed of an SCO connection is always 
64kb/s. You need only larger HV Packets if you have several SCO
Connections which have to share bandwidth. 
Why SCO isn't usable for data transfer is explained several times in
mailinglist archive.

nicholas


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