4G, or not 4G – that is the question

Someone asked me this weekend about 4G Wireless; Wikipedia has a good basic description. (Plus I also watched Kenneth Branagh’s Hamlet this weekend (OK, it is Shakespeare’s Hamlet – as interpreted by Branagh) Excellent DVD)

ITU Requirements

This article uses 4G to refer to IMT-Advanced (International Mobile Telecommunications Advanced), as defined by ITU-R. An IMT-Advanced cellular system must fulfill the following requirements:

  • All-IP communications.
  • Peak data rates of up to approximately 100 Mbit/s for high mobility such as mobile access and up to approximately 1 Gbit/s for low mobility such as nomadic/local wireless access, according to the ITU requirements.
  • Scalable channel bandwidth, between 5 and 20 MHz, optionally up to 40 MHz.[6][6][7]
  • Peak link spectral efficiency of 15 bit/s/Hz in the downlink, and 6.75 bit/s/Hz in the uplink (meaning that 1 Gbit/s in the downlink should be possible over less than 67 MHz bandwidth)
  • System spectral efficiency of up to 3 bit/s/Hz/cell in the downlink and 2.25 bit/s/Hz/cell for indoor usage[6]

Confusion has often been caused by some mobile carriers who have launched products advertised as 4G but which are actually current so-called 3.9G technologies, and therefore do not follow the ITU-R defined principles for 4G standards.

Who’s foreclosing in your neighborhood?

I saw this interesting link in the NY Times


On my browser you have to click on “show search options” to get the drop-down menu. I wasn’t interested in finding a particular foreclosure property, just in getting an idea of the economic health of my neighborhood. We look good, but the surrounding communities have got some problems. It would be interesting to try looking a through a set of quarterly snapshots to see how the maps change over time.