[Bluez-devel] Parameters of the Bluetooth standard in BlueZ...

[Bluez-devel] Parameters of the Bluetooth standard in BlueZ...

[Jers]

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Dear all,

 

I'm not a developer but I need your help!

At the moment I'm carrying out a study about Bluetooth standard. In this study I modified some parameters of Inquiry and Inquiry Scan procedures. Now I want to test my analytical results by real experiments. I'd like to evaluate the discovery performances of two bluetooth devices, changing:

 

-         in Inquiry Scan procedure:

o       Time spent in Rx (>=16*Tslot, according to the standard)

o       The period between two consecutive inquiry scan (<2.56 sec, according to the standard)

-         in Inquiry procedure:

o       The period between the transmission of two consecutive packets (According the standard: 244.5 msec, after odd packets; 869.5 msec, after even packets)

o       Number of repetitions of frequencies trains.

-         in both procedures:

o       number of employed hops

 

I suppose I can set these parameters by BlueZ, so I looked for lines that manage them in all BlueZ files but I didn't find. 

 

Can I change these parameters in BlueZ?

If I can, which file(s) and functions do I have to modify?

Thanks in advance.

 

Best regards.

Jers

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RE: [Bluez-devel] Parameters of the Bluetooth standard in BlueZ...

[Halam Rose]

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It may be an idea to look at the Bluetooth 1.2 procedures as they speed up connections.
 
Halam

-----Original Message-----
From: Jers [mailto:jers@inwind.it]
Sent: 27 February 2004 10:32
To: bluez-devel@lists.sourceforge.net
Subject: [Bluez-devel] Parameters of the Bluetooth standard in BlueZ...



Dear all,

 

I'm not a developer but I need your help!

At the moment I'm carrying out a study about Bluetooth standard. In this study I modified some parameters of Inquiry and Inquiry Scan procedures. Now I want to test my analytical results by real experiments. I'd like to evaluate the discovery performances of two bluetooth devices, changing:

 

-         in Inquiry Scan procedure:

o       Time spent in Rx (>=16*Tslot, according to the standard)

o       The period between two consecutive inquiry scan (<2.56 sec, according to the standard)

-         in Inquiry procedure:

o       The period between the transmission of two consecutive packets (According the standard: 244.5 msec, after odd packets; 869.5 msec, after even packets)

o       Number of repetitions of frequencies trains.

-         in both procedures:

o       number of employed hops

 

I suppose I can set these parameters by BlueZ, so I looked for lines that manage them in all BlueZ files but I didn't find. 

 

Can I change these parameters in BlueZ?

If I can, which file(s) and functions do I have to modify?

Thanks in advance.

 

Best regards.

Jers



Halam Rose
Bluetooth Specialist
Tel: +44 (0)1763 262524
Fax: +44 (0)1763 261177 

Halam.Rose@7layers-uk.com
http://www.7layers-uk.com

Meet 7 layers 
3GSM World Congress 
23-27 February 2004 
Cannes, France. 
Booth B 28 Hall 1.

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Re: [Bluez-devel] Parameters of the Bluetooth standard in BlueZ...

[Marcel Holtmann]

Hi Jers,

> At the moment I=A2m carrying out a study about Bluetooth standard. In
> this study I modified some parameters of Inquiry and Inquiry Scan
> procedures. Now I want to test my analytical results by real
> experiments. I=A2d like to evaluate the discovery performances of two
> bluetooth devices, changing:
>=20
> =20
>=20
> -         in Inquiry Scan procedure:
>=20
> o       Time spent in Rx (>=3D16*Tslot, according to the standard)
>=20
> o       The period between two consecutive inquiry scan (<2.56 sec,
> according to the standard)
>=20
> -         in Inquiry procedure:
>=20
> o       The period between the transmission of two consecutive packets
> (According the standard: 244.5 msec, after odd packets; 869.5 msec,
> after even packets)
>=20
> o       Number of repetitions of frequencies trains.
>=20
> -         in both procedures:
>=20
> o       number of employed hops
>=20
> =20
>=20
> I suppose I can set these parameters by BlueZ, so I looked for lines
> that manage them in all BlueZ files but I didn=A2t find.=20
>=20
> =20
>=20
> Can I change these parameters in BlueZ?

you can change everything for that you find a HCI command in the
Bluetooth specification.

Regards

Marcel




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Re: [Bluez-devel] Parameters of the Bluetooth standard in BlueZ...

[Steven Singer]

Jers wrote:
> o       The period between the transmission of two consecutive packets
> (According the standard: 244.5 msec, after odd packets; 869.5 msec,
> after even packets)

Coo, you quoted the time from the end of one packet to the start of the
next. I've never seen anyone quote them that way before. Everybody else
measures the time from the start of one packet to the start of the next.
Those would be 312.5 us (half a slot) and 987.5 us (one and a half slots).

And please, the appropriate abbreviation for microseconds is <greek-mu>s
never replace the mu with an m as ms is short for milliseconds - a big
difference. In ASCII text, replace the mu with a u as u is not an SI
prefix so is not prone to confusion. Saying sec instead of s is also
non-standard, but will get you in to trouble only if you try and publish
in a scientific journal.

> I suppose I can set these parameters by BlueZ, so I looked for lines
> that manage them in all BlueZ files but I didn't find.

You can't set these parameters in BlueZ. They're hardcoded in the
Bluetooth chip. All BlueZ does is send down a command asking the chip
to do an inquiry. The chip then sends out thousands of packets and
just reports interesting events back to the host.

BlueZ doesn't even have control over the amount of time the chip spends
on each page train, nor does it have control over the number of hops
used (the country code used to have a small effect on the number of
hops, but country codes have been deprecated).

BlueZ does have control over the total inquiry length and, on the
scanning side, the time between entering inquiry scans and the amount
of time spend in a scan each time.

	- Steven
-- 




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