|
Wireless Networks
Wireless Networking Standards
Wireless network standards are
very important when there are a number of network technologies vying for
leadership. The problem is further complicated by legacies of existing
networks - this is especially true in North America. Agreement between
different national and international standard-setting bodies who are courted
by vendors with their unique interests takes a long time. It is a
bureaucratic process that goes through a very formal procedure.
Quite often, a vendor has a
proprietary technology that he wants to be adopted by others would propose a
standard. This is good on the surface in so far as the proponent offers to
other vendors what they have already developed. However, the proposing
vendor wants others to follow its lead and therefore gain a competitive
advantage. In other cases, several vendors get together and establish a
defacto standard which they want to become dejure standards endorsed by a
standards body.
The following brief information
on wireless network standards is provided by Mobileinfo.com to acquaint you with major
standards in this area. There are a
number of additional sub-standards. This is a fairly big area. We recommend the following resource that
provides the most comprehensive information:
CTIA also provides some
information on wireless network standards. So does TIA.
Those who are
involved in following the progress of these standards through various
standard-setting bodies from carrier perspective should investigate getting
additional information from CNP (Cellular Network Perspective) or from TIA.
For an overview on AMPS, TDMA
and CDMA, go to www,teleresearch.com/overview.htm
| IS-41
| Wireless inter-systems operation
standard. Now called TIA/EIA-41 |
| IS-54
| First generation TDMA Radio
interface standard - TDMA stands for Time Division Multiple Access which
implies that a single channel is divided into a number of time slots. Each
user is allotted a slot after a fixed number of slots . IS-54 was the first
standard for digital cellular standard. TDMA, therefore, requires that voice
be digitized, compressed and then transmitted over the air. Is136 is the
second generation follow-on to IS-54.Major difference is that IS-136 uses
TDMA on the control channel also. TDMA divides a 30 KHz channel into three
10KHz slots, thus getting higher efficiency. In future, half-rate coders may
allow 6 users per 30 KHz channel. E-TDMA (promoted by Hughes Network) uses
dynamic time slot allocation. |
| IS-88
| CDMA digital cellular standard -
Find more about CDMA
on this site. Learn about CDMA from CDMA online.
CDMA is a "spread spectrum" technology,
which means that it spreads the information contained in a particular signal
of interest over a much greater bandwidth than the original signal.
When implemented in a cellular telephone system, CDMA
technology offers following benefits:
- Capacity increases of 8 to 10 times that of an AMPS
analog system and 4 to 5 times that of a GSM system
- Improved call quality, with better and more consistent
sound as compared to AMPS system
- Simplified system planning through the use of the same
frequency in every sector of every cell
- Improved coverage characteristics, allowing for the
possibility of fewer cell sites
|
| IS-91
| Standard for analog cellular air
interface standard (including NAMPS) |
| IS-93
| Wireless to PSTN interface
standard |
| IS-95
| TIA standard for digital
cellular CDMA air interface between CDMA networks and digital handsets -
used in cdmaOne. Find
more about IS-95 and CDMA from a Prentice Hall book by Liberty and
Rapport |
| IS-124
| Standard for Wireless call
detail and billing record format for online transfer |
| IS-136
| Standard for Second generation
TDMA air interface standard. As compared to IS-54, IS-136 uses TDMA for
control channel also. |
| IS-637
| Standard for CDMA SMS (short message
service) |
| IS-756
| A TIA
standard for WNP
(Wireless Network Portability) - Go
here for more |
| IS-2000
| Standard for cdma2000
air interface - Follow on to to TIA/EIA-95-B |
|
