|
Written by David Chambers
|
|
Tuesday, 09 December 2008 |
|
 VoIP (Voice over IP) services can suffer from bad press where they compete for
bandwidth with your PC or other data applications on your network.
Voice is particularly intolerant to delay - if a packet isn't received
in time then it's discarded causing silence. Some codecs are
tolerant of packet loss, and this one reason why Skype is
perceived to work better than many other VoIP systems.
An important
bottleneck is near the start of its journey, where voice traffic from
your femtocell competes with other devices to send data through your
broadband connection. Where a typical DSL broadband connection is used,
the uplink capacity is typically only 5% to 10% of the downlink,
but voice calls use bandwidth more symetrically than data services.
This increases the chances of packet collision, and delays.
|
|
Last Updated ( Tuesday, 09 December 2008 )
|
|
|
Written by David Chambers
|
|
Saturday, 06 December 2008 |
 There’s been a lot of hype recently proposing femtocells as a low cost
means of rolling out mobile network capacity (specifically for LTE, the
new 4th Generation radio standard). Femtocells could be a low cost way
of providing hotspot capacity in public areas. But in some situations,
it will compete with existing techniques. Here we compare and contrast
femtocells with DAS.
|
|
Last Updated ( Sunday, 07 December 2008 )
|
|
|
Written by David Chambers
|
|
Sunday, 30 November 2008 |
 The product lifecycle of femtocells involves developing more
functionality and capability as the concept and components are passed
up through a series of vendors and operators to the end customer. We
can see that different technologies are at different stages of this
femtocell product life-cycle as shown in the chart below.
|
|
Last Updated ( Tuesday, 02 December 2008 )
|
|
|
Written by David Chambers
|
|
Tuesday, 18 November 2008 |
|
 picoChip announced a new chip and reference design this week which sets the bar for LTE femtocells and could determine the path by which the mobile industry rolls out its 4G networks. We spoke with Doug Pulley, the picoChip CTO to understand where they’re coming from, and uncovered a dual-mode 3G/4G chipset in the works.
|
|
Last Updated ( Wednesday, 19 November 2008 )
|
|
|
Written by David Chambers
|
|
Tuesday, 11 November 2008 |
|
 The most common type of femtocell is based on 3rd Generation UMTS
mobile phone system, which evolved from GSM. This 3G system has been
enhanced to include high speed broadband data (called HSPA) at rates up
to 21Mbit/s with a roadmap that promises rates of 84Mbit/s.A typical 3G femtocell is shown on the left - this is the Zonegate product from Ubiquisys.
3G femtocells like this are
compatible with operators such as T-Mobile and AT&T in the US,
SoftBank in Japan and most mobile operators in the rest of the world.
It is this wide adoption of the GSM family of standards (over 87% of
all mobile phones are GSM capable) that makes this the most attractive
market for vendors.
|
|
Last Updated ( Tuesday, 11 November 2008 )
|
|
|
|
<< Start < Prev 1 2 3 4 Next > End >>
|
| Results 1 - 9 of 34 |
Blog updates via RSS
