Thursday, November 18, 2004

Bluetooth-why ar't thy so slow

The wireless data transmission standard Bluetooth can transfer up to 723kbps which means speeds of up to 72kbytes/sec are possible. However, not one of my handhelds acheived speeds of more than 10kb. The Palm OS connection settings limit the speed to 115200bps. I have already wondered about this for quite some time. I was at the vienniese Siemens Embedded Day today. There were some electronic soccer robots-and the operator talked to somebody else about wireless data transmission. My presence led to the discussion of bluetooth speeds in mobile devices. This is what the operator had to say:
Most bluetooth chips use the HID protocol for communication-and usually connect to the host CPU via a serial link(USB dongles use-nomen est omen-USB). These serial links usually cannot acheive much more than 115200bps. Thus, most stacks are designed for only this speed. If the link is faster, the stack slows it down.
Seems quite plausible to me, because: Many people underestimate the importance of the stack. Some Freescale Semiconductor Microcontrollers include an ethernet stack. The Freescale engineer urged the participants of the seminar to evaluate the different stacks, as some could MORE THAN DOUBLE data throughput. Now as if this isn't performance impact!
BTW, the presentator informed the listeners that neither symbian nor PPC devices are faster. They use Xscale CPUs too, so they won't have a faster link. So, we can at least rest assured that the competition doesn't surf faster!
I am-as always-looking forward to some interesting discussion!

12 Comments:

Blogger gunzz said...

Hi Tam, if you are interested in more about Freescale and their micros, take a trip over to this site...

http://freegeeks.net/index.php

The Freegeeks would be happy to talk with you....

11:58 PM  
Anonymous Anonymous said...

I just wish I've read this before.
After my first bluetooth hotsynch I was so disapointed and I was wondering if everything was fine.
At first I was so happy not to have to use cables anymore and with my bluetooth embedded powerbook it was perfect, no dongles no nothing, just the pda and the notebook, and hotsynch whenever needed. But the performance ...
I thought bluetooth was at least as fast as USB 1.0
Too bad I'm wrong and you right.


A.
T5 owner.

11:36 PM  
Blogger Tam Hanna said...

Hi,
yes, this was an astonishment for me too! I always thought that it is only the OS'ses fault.
A Sorry goes to gunz-I havent yet had time to check over at freegeek's, but I eventually will!
Best regards and thanks for the comments
Tam

1:08 PM  
Blogger Brad Green said...

Dont feel bad about the hotsync. WiFi hotsyncs on a TH-55 have to be done on full power mode, which severely drains the battery. Either that, or they are exceedingly slow. They should be able to do better, its dissapointing.

2:09 PM  
Blogger Brad Green said...

Dont feel bad about the hotsync. WiFi hotsyncs on a TH-55 have to be done on full power mode, which severely drains the battery. Either that, or they are exceedingly slow. They should be able to do better, its dissapointing.

2:09 PM  
Blogger Brad Green said...

Dont feel bad about the hotsync. WiFi hotsyncs on a TH-55 have to be done on full power mode, which severely drains the battery. Either that, or they are exceedingly slow. They should be able to do better, its dissapointing.

2:10 PM  
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