[Bluez-devel] Baseband Packets

[Bluez-devel] Baseband Packets

[Bruno Abinader]

Hello guys, now that I know that bluez supports all types of packets,
i'm just wondering if it changes the packet type according to the
sender/receiver devices supported packets  info, and if it does, if it
automatically selects the best packet type according to the
enviroment, like in a file transfer, for example, according to the BER
or other error factors. (e.g: DH5 when BER < 10^(-5), or DM1 when BER
> 10^(-2)). Thanks!
--=20
Bruno de Oliveira Abinader
GVoIP - INdT/UFAM


-------------------------------------------------------
SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now.
http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
_______________________________________________
Bluez-devel mailing list
Bluez-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bluez-devel

Re: [Bluez-devel] Baseband Packets

[Marcel Holtmann]

Hi Bruno,

> now that I know that bluez supports all types of packets,
> i'm just wondering if it changes the packet type according to the
> sender/receiver devices supported packets  info, and if it does, if it
> automatically selects the best packet type according to the
> enviroment, like in a file transfer, for example, according to the BER
> or other error factors. (e.g: DH5 when BER < 10^(-5), or DM1 when BER
> > 10^(-2)).

this is the job of the link manager and it is part of the Bluetooth chip
and not a host stack like BlueZ.

Regards

Marcel




-------------------------------------------------------
SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now.
http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
_______________________________________________
Bluez-devel mailing list
Bluez-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bluez-devel

Re: [Bluez-devel] Baseband Packets

[Anderson Rodrigues]

Hi,

The spec says that: "Quality measurements in the receiver of one
device can be used to dynamically control the packet type transmitted
from the remote device for optimization of the data throughput."

The question is, is it done automatically or not? May we assume that
LM is smart enough to measure the RF channel and based on it changes
automatically the packet type ?

If not, is there any point in bluez that we can talk with LM?

Regards,

On 4/15/05, Marcel Holtmann <marcel@holtmann.org> wrote:
> Hi Bruno,
>=20
> > now that I know that bluez supports all types of packets,
> > i'm just wondering if it changes the packet type according to the
> > sender/receiver devices supported packets  info, and if it does, if it
> > automatically selects the best packet type according to the
> > enviroment, like in a file transfer, for example, according to the BER
> > or other error factors. (e.g: DH5 when BER < 10^(-5), or DM1 when BER
> > > 10^(-2)).
>=20
> this is the job of the link manager and it is part of the Bluetooth chip
> and not a host stack like BlueZ.
>=20
> Regards
>=20
> Marcel
>=20
>=20
> -------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
> Read honest & candid reviews on hundreds of IT Products from real users.
> Discover which products truly live up to the hype. Start reading now.
> http://ads.osdn.com/?ad_id=3D6595&alloc_id=3D14396&op=3Dclick
> _______________________________________________
> Bluez-devel mailing list
> Bluez-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bluez-devel
>=20


--=20
Anderson Clayton B. Rodrigues
Eng. de Software
Instituto Nokia de Tecnologia - INdT


-------------------------------------------------------
This SF.Net email is sponsored by: New Crystal Reports XI.
Version 11 adds new functionality designed to reduce time involved in
creating, integrating, and deploying reporting solutions. Free runtime info,
new features, or free trial, at: http://www.businessobjects.com/devxi/728
_______________________________________________
Bluez-devel mailing list
Bluez-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bluez-devel

Re: [Bluez-devel] Baseband Packets

[Marcel Holtmann]

Hi Anderson,

> The spec says that: "Quality measurements in the receiver of one
> device can be used to dynamically control the packet type transmitted
> from the remote device for optimization of the data throughput."
> 
> The question is, is it done automatically or not? May we assume that
> LM is smart enough to measure the RF channel and based on it changes
> automatically the packet type ?

the link manager should be smart enough, but choosing the right packet
type is a science by itself.

> If not, is there any point in bluez that we can talk with LM?

We can only limit available packet types, but this makes no sense at all
and should never be done.

Regards

Marcel




-------------------------------------------------------
This SF.Net email is sponsored by: New Crystal Reports XI.
Version 11 adds new functionality designed to reduce time involved in
creating, integrating, and deploying reporting solutions. Free runtime info,
new features, or free trial, at: http://www.businessobjects.com/devxi/728
_______________________________________________
Bluez-devel mailing list
Bluez-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bluez-devel

Re: [Bluez-devel] Baseband Packets

[Anderson Rodrigues]

Marcel,

I understand your arguments. But is It possible to interact with the
LM by software? I mean, send PDUs ... Probably you have faced many
many problems in order to build Bluez, and probably you have gained a
huge experience and even you dont intend to implement it you have an
idea of how i could start of doing it for academic porposes. Any help
would be very welcome.

all the best,

On 4/18/05, Marcel Holtmann <marcel@holtmann.org> wrote:
> Hi Anderson,
>=20
> > The spec says that: "Quality measurements in the receiver of one
> > device can be used to dynamically control the packet type transmitted
> > from the remote device for optimization of the data throughput."
> >
> > The question is, is it done automatically or not? May we assume that
> > LM is smart enough to measure the RF channel and based on it changes
> > automatically the packet type ?
>=20
> the link manager should be smart enough, but choosing the right packet
> type is a science by itself.
>=20
> > If not, is there any point in bluez that we can talk with LM?
>=20
> We can only limit available packet types, but this makes no sense at all
> and should never be done.
>=20
> Regards
>=20
> Marcel
>=20
> -------------------------------------------------------
> This SF.Net email is sponsored by: New Crystal Reports XI.
> Version 11 adds new functionality designed to reduce time involved in
> creating, integrating, and deploying reporting solutions. Free runtime in=
fo,
> new features, or free trial, at: http://www.businessobjects.com/devxi/728
> _______________________________________________
> Bluez-devel mailing list
> Bluez-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bluez-devel
>=20


--=20
Anderson Clayton B. Rodrigues
Eng. de Software
Instituto Nokia de Tecnologia - INdT


-------------------------------------------------------
This SF.Net email is sponsored by: New Crystal Reports XI.
Version 11 adds new functionality designed to reduce time involved in
creating, integrating, and deploying reporting solutions. Free runtime info,
new features, or free trial, at: http://www.businessobjects.com/devxi/728
_______________________________________________
Bluez-devel mailing list
Bluez-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bluez-devel

Re: [Bluez-devel] Baseband Packets

[Marcel Holtmann]

Hi Anderson,

> I understand your arguments. But is It possible to interact with the
> LM by software? I mean, send PDUs ... Probably you have faced many
> many problems in order to build Bluez, and probably you have gained a
> huge experience and even you dont intend to implement it you have an
> idea of how i could start of doing it for academic porposes. Any help
> would be very welcome.

it is not possible to interact directly with the link manager. The only
way is over HCI.

Regards

Marcel




-------------------------------------------------------
This SF.Net email is sponsored by: New Crystal Reports XI.
Version 11 adds new functionality designed to reduce time involved in
creating, integrating, and deploying reporting solutions. Free runtime info,
new features, or free trial, at: http://www.businessobjects.com/devxi/728
_______________________________________________
Bluez-devel mailing list
Bluez-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bluez-devel