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Verizon Wireless API Will “Turbo” Sessions

Thursday, November 3rd, 2011
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Verizon will publish an application programming interface that could allow mobile consumers to “turbocharge” the network bandwidth their smartphone apps use, presumably for a small additional fee.

“I think one of the things that you could do is guaranteed quality of service,” said Hugh Fletcher, associate director for technology in Verizon’s Product Development and Technology team.

“One of the things that we are right now is very democratic in terms of allocating spectrum and bandwidth to users. And just because you request a high quality of service doesn’t mean you’re gonna get it. [The network] will try to give it to you, but if there’s a lot of congestion, a lot of people using it, it won’t kick people off,” said Fletcher. Verizon API To Give Apps ‘Turbo’

The network optimization API will likely expose attributes like jitter, latency, bandwidth, and priority to app developers, Fletcher said.

Despite expected complaints from some network neutrality advocates, there is a reason such an API might provide clear value to end users. Some of you might be using 3G or 4G networks, using different air interfaces, to use interactive cloud applications. If you do that often enough, on many networks, you will have discovered the experience problem caused by latency.

Where older GPRS or EDGE data networks featured round-trip latencies in the 600 millisecond to 700 msec. range, LTE networks feature round-trip latencies in the 50 msec. range.

One of the important elements of a cloud-delivered application experience is latency performance, even though we most often think of “bandwidth” as being the key “experience” parameter.

Some might say the key benefits will be for gaming apps, but many of us can assure you that other interactive apps, even those not intrinsically dependent on “real time” protocols, can suffer from mobile latency. Latency issues


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LightSquared Use of Satellite for Backhaul Will Have Latency Implications

Thursday, June 16th, 2011
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One of the issues I still don’t fully understand is the proposed reliance on satellite for backhaul by LightSquared, the proposed new Long Term Evolution service provider in the United States that hopes to use frequencies originally allocated for satellite communications.

LightSquared hopes to use the spectrum to create a national wholesale Long Term Evolution network.

But the reliance on a space segment for backhaul strikes me as less than optimal, given the latency introduced by the lengthy space segment, and the processing that might be required to support real-time services such as gaming, videoconferencing, voice and some enterprise apps.

I am told there are new coding techniques that allow satellite networks to support voice communications where it would have been quite difficult in the past. But I’m not so sure those techniques are cheap enough to deploy in a consumer setting.

A  study by The Rural Mobile and Broadband Alliance (RuMBA) USA points out latency differences between fixed-line and mobile or satellite broadband. “If you ping a typical wireless access point within a home or small office network you should see an average latency of about 2 ms,” says Stephen Cobb, a consultant who prepared the report.  See
http://rumbausa.ning.com/.

“If you are on a cable or DSL connection to the Internet and ping a commercial website like www.bankofamerica.com, you will see latency of about 60 ms. Unfortunately, a satellite Internet connection is likely to have a latency of 600 ms or more when contacting the same
website,” says Cobb.

Latency is not an overwhelming issue for some operations, such as casual Web surfing or even pre-recorded video, if the buffer is big enough. But it strikes me that relying on satellite backhaul as possibly difficult, especially for real-time services.


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Latency Advantages for 40/100GB Networks

Wednesday, June 8th, 2011
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Mid-2010 saw the introduction of the new 40/100GB networking standard, an obvious capacity increase, but the lower latency also is a key advantage, much as Long Term Evolution has better latency performance than third generation mobile air interfaces.

Compared to gigabit or 10 Gbps networks, network latency is less than two milliseconds, even over long network hops of 100 miles or more, says Craig Denton, CEO of Next Connex.

In turn, these speeds mean that latency in the network connection between head offices and data centers can be minimized compared with other factors in application or data processing.

High network speeds also better accommodate the frequent, temporary bursts generated by data intensive applications. If the data rate of these bursts exceeds the capacity of a network link, data will be forced to queue, introducing unwanted delays and even risking crashes, Denton argues.

High & Low: Performance & Latency Matter


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