HSDPA upload speed(s)

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BigBen - 05 Apr 2006 14:50 GMT

Hi All,

I've read everywhere that HSDPA does around 1.4 or 1.8 Mbps download,
but I can't seem to find information about upload speeds...

Anyone??

TIA,
jbr

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John Navas - 05 Apr 2006 15:50 GMT

>I've read everywhere that HSDPA does around 1.4 or 1.8 Mbps download,
>but I can't seem to find information about upload speeds...

As always, "Google is your friend":
<http://www.google.com/search?q=hsdpa%20upload-speed>

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BigBen - 06 Apr 2006 02:28 GMT

>As always, "Google is your friend":
><http://www.google.com/search?q=hsdpa%20upload-speed>

Not much impressed, with 384 Kbps, I must say - that's what 3G cards
are doing right now, right here (PT).

Since the download speed is going up so much, I expected a lot more
for upload. The way I see it, it's still a long shoot for reliable and
pleasant VoIP. (But then, you can always use JaJah :-) )

C ya,
jbr

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Benjamin Baumgärtner - 07 Apr 2006 08:31 GMT

BigBen schrieb:

> Not much impressed, with 384 Kbps, I must say - that's what 3G cards
> are doing right now, right here (PT).
>
> Since the download speed is going up so much, I expected a lot more
> for upload. The way I see it, it's still a long shoot for reliable and
> pleasant VoIP. (But then, you can always use JaJah :-) )

Perhaps you should write out the abbreviation HSDPA and things will
become more obvious...

For increased upload speed you have to wait until the implementation of
HSUPA. HSDPA doesn't affect the upload speed, so you have just ordinary
UMTS speed.

cheers,
Ben

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BigBen - 07 Apr 2006 20:40 GMT

>Perhaps you should write out the abbreviation HSDPA and things will
>become more obvious...

High Speed Download something...

>For increased upload speed you have to wait until the implementation of
>HSUPA. HSDPA doesn't affect the upload speed, so you have just ordinary

And when would that be??

I'm already reading about 3.6 Mbps dowloads for a near future, which
still doesn't enthusiast me at all, if that still means I can't have
decent latencies, and good upload speeds, that allow me to use VoIP
acceptably.

I'm currently on CDMA2000, with 1.4 Mbps down, 153 Kbps up, the
latency is lowsy, and VoIP is just wishfull thinking - therefore,
having used VoIP properly, and having friends and family living
"abroad", I consider Jajah a blessing.

By the way, is WiMax for real, or just politics before election day?

Cheers,
jbr

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John Navas - 07 Apr 2006 20:52 GMT

>>Perhaps you should write out the abbreviation HSDPA and things will
>>become more obvious...
>
>High Speed Download something...

High-Speed Downlink Packet Access
<http://en.wikipedia.org/wiki/HSDPA>

>>For increased upload speed you have to wait until the implementation of
>>HSUPA. HSDPA doesn't affect the upload speed, so you have just ordinary
>
>And when would that be??

Unknown, but probably not for some time, 2007 or later.
<http://en.wikipedia.org/wiki/High-Speed_Uplink_Packet_Access>

>I'm already reading about 3.6 Mbps dowloads for a near future, which
>still doesn't enthusiast me at all, if that still means I can't have
>decent latencies, and good upload speeds, that allow me to use VoIP
>acceptably.

HSDPA has good latency and more than enough uplink speed for acceptable VoIP.

>By the way, is WiMax for real, or just politics before election day?

Real, and already being deployed.
<http://en.wikipedia.org/wiki/Wimax>

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BigBen - 08 Apr 2006 12:40 GMT

>HSDPA has good latency and more than enough uplink speed for acceptable VoIP.

Can you quantify good latency? My CDMA2000 connection doesn't get any
better than 300 ms latency, on a good, sun shiny day. Upload is only
153 Kbps. A bad joke for VoIP

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John Navas - 08 Apr 2006 16:47 GMT

>>HSDPA has good latency and more than enough uplink speed for acceptable VoIP.
>
>Can you quantify good latency? My CDMA2000 connection doesn't get any
>better than 300 ms latency, on a good, sun shiny day. Upload is only
>153 Kbps. A bad joke for VoIP

HSDPA latency is on the order of 70+ ms, or less than dial-up.

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BigBen - 09 Apr 2006 01:54 GMT

>HSDPA latency is on the order of 70+ ms, or less than dial-up.

Hold on, 70 ms, for a wireless connection, is very good!! But the +
mark in front of it makes me wonder - how far up, how often, does it
go, from the excelent 70 ms??

Regards,
jbg

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Benjamin Baumgärtner - 10 Apr 2006 08:12 GMT

BigBen schrieb:

> Can you quantify good latency? My CDMA2000 connection doesn't get any
> better than 300 ms latency, on a good, sun shiny day. Upload is only
> 153 Kbps. A bad joke for VoIP

Just to quantify things, figures just measured on a HSDPA link:

PING www.l.google.com (66.249.93.104) 56(84) bytes of data.
64 bytes from 66.249.93.104: icmp_seq=1 ttl=237 time=169 ms
[...snip...]
64 bytes from 66.249.93.104: icmp_seq=50 ttl=237 time=146 ms

--- www.l.google.com ping statistics ---
50 packets transmitted, 50 received, 0% packet loss, time 49202ms
rtt min/avg/max/mdev = 138.633/149.639/202.372/10.466 ms

So the average latency is about 150 ms. I didn't measure the upload
speed now. But you're right, there is a strong dependency from the
signal strength and with a weak signal the datarate drops quickly.

I guess this should be enough for VoIP, isn't it? I'm using Skype with
Video over such a link (okay, no SIP...) and it is sufficient.

Cheers,
Benjamin

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BigBen - 10 Apr 2006 14:04 GMT

>So the average latency is about 150 ms. I didn't measure the upload
>speed now. But you're right, there is a strong dependency from the
>signal strength and with a weak signal the datarate drops quickly.

That's about half - or twice as good - as I get in EVDO mode, on a
CDMA2000 connection. Where I live the signal is bad though, as I often
get disconected, and using Skype I transmit loads of noise, and
distorted sounds.

A better than the original antena has helped me, but only to get a
stable connection on 1x mode - 153 Kbps both ways, so 500 ms latency

:-(

I've had to given up on "pure" VoIP (at least temporarily), and I'm
very happy with Jajah (for voice calls only), which is callback over
VoIP, trigered through the web, to your phone, or to your granny's,
who might not know anything about VoIP - I'm loving it!)

Anyway, have a contract with my present CDMA200 ISP untill November,
the HSDPA cards (and montly rates) are still too expensive for me,
and I'm not even sure if my residence is covered by HSDPA ...

Maybe next Christmas they have the new HSDPA 3.6 available, and the
HSPDA 1.8 on sale ;-)

C ya,
jbr

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