TCO Certified Wireless Analyst Course 2231 Wireless Fundamentals Lesson 1 Introduction and Radio Fundmentals
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Course 2231 Wireless Fundamentals
Radio fundamentals • Spectrum • Digital radio • Modems and Modulation • Propagation, Penetration and Fading
Wireless Fundamentals is the first course in the CWA Certification Package. We begin with the basics: what radio is, how it’s organized and how and it’s used to communicate information.
We begin by understanding what radio actually is, and why we use it for communications. We’ll understand how radio frequencies are in the Gigahertz range, used within frequency bands measured in the Megahertz wide.
Then we will look at the spectrum, i.e. standardized bands of frequencies, how they are allocated and the need for licenses. You will learn which bands are used for what, from cordless phones to WiFi and cellular, including the new 700-MHz bands.
Next, we’ll understand how information is represented using radio. The first stop is a quick review of old-fashioned analog radio and TV, followed by what most systems use today: digital. We’ll spend some time understanding digital, how 1s and 0s are communicated by modems and familiarize you with jargon and buzzwords like QAM and QPSK.
We’ll finish off with radio transmission issues, including propagation, penetration and fading.
Course Lessons 1. Radio Fundamentals 2. Wireless Spectrum and Radio Bands 3. Analog Radio 4. Digital Radio: How Modems Work 5. Propagation, Penetration and Fading
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Mobile Network Operator (MNO) is the term
usually used to refer to a facilities-based carrier, i.e. a company that owns
base stations, a mobile switch, backhaul between them, and spectrum licenses,
and sells services to the public… and to other carriers.
The MNO implements external links to other
carriers for PSTN phone calls and for Internet traffic.
For PSTN phone calls, the MNO implements a
fiber optic connection to a building traditionally called a Toll Center or
Class 4 switching office. The termination of their fiber in that building is
called a POP. It is their physical point of presence in the building.
Many other carriers have POPs in the
building, including the ILEC, IXCs, CATV companies, other mobile carriers, and
any other company that wants to connect phone calls to a phone on the MNO’s
network.
The operator of the toll center, usually the
ILEC, provides a switch in the Toll Center to switch phone calls from one
carrier’s POP to a different carrier’s POP.
For Internet access, the MNO implements a
fiber optic connection to one or more Internet Exchange buildings, where they
pay the operator of the IX to route packets to other carriers with whom the MNO
has established IP packet transit and peering arrangements.
9.7.2 Mobile Virtual Network Operator
Mobile Virtual Network Operator (MVNO) is the
term used to refer to a non-facilities-based carrier… one that does not own
the hardware or spectrum licenses or POPs.
Instead, the MVNO enters into a long-term
contract with one or more facilities-based carriers to have them supply a
“white label” service that the MVNO sells.
Typically the MVNO will develop a unique
branding and sell smartphones and tablets to go along with its service.
When the MVNO deals exclusively with one
carrier, the MVNO bill to the customer would be typically generated by the
facilities-based carrier as a white-label service.
If the MVNO is very large and deals with
multiple carriers, the MVNO may operate their own billing system, which is a
significant investment.
The facilities-based carrier charges to the
MVNO includes a volume-discount rate for IP addresses and Internet traffic,
voice-minute airtime and switched access to the POP for PSTN phone calls.
The MVNO also has to pay for connectivity
from the POP to other toll centers for “long-distance” connections,
and the switched-access charge at the far end.
The rate plan the MVNO pays could be a mix of
fixed-rate leases and usage-based billing.
Unless the MNO is obliged to sell capacity to
MVNOs through regulations and tariffs, the nature of the plan is confidential
business information.
9.7.3 Roaming
Roaming service is very similar to the
service provided to MVNOs, in that it is the MNO that is providing the airlink,
base stations, backhaul, mobile switch and connections to the PSTN and
Internet.
In the case of roaming, the visitor uses
their own phone, and billing is usage-based.
Roaming is an important feature for smaller
players: they are facilities-based in selected cities, but to offer a national
and international service to their customers, they must have roaming agreements
in place with MNOs in other locations.
By denying roaming service to smaller or
startup carriers, or charging an exorbitant price for roaming, an incumbent
carrier can erect a barrier against competition.
In many countries, the right to roam and the
wholesale cost of roaming is regulated to encourage competition.
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Low-Power Wide-Area (LPWA) systems, also called Low-Power Wide-Area Networks (LPWANs) are wireless systems for sensor data reporting and remote control.
There are four main technologies, divided into two groups: technologies deployed by mobile (cellular) carriers, and technologies deployed by non-cellular carriers.
The technologies deployed by cellular operators are Narrowband Internet of Things (NB-IoT) and Long Term Evolution category M1 (LTE-M).The technologies deployed by non-cellular operators are sigfox and LoRa (short for Long Range).
Sigfox and LoRa operate in unlicensed spectrum often called Industrial, Scientific and Medical (ISM) bands, at relatively low frequencies. In Europe the 868-MHz band is used; in the US it is 915 MHz; and 923 or 433 MHz in Asia.
Sigfox is a French company that established a base of customers with water meters from the French water authority Veolia and has expanded internationally. It provides the leanest communication service, using 100 Hz of bandwidth to move tiny data packets with payloads of 12 bytes upload and 8 bytes download, with limits on the number of messages per day. The theoretical data rate is 600 bits per second. This reduces the subscription costs and extends battery life. It can support 1 million devices per base station transceiver.
LoRa is a competing technology also using ISM bands, using 125 kHz of bandwidth to achieve a theoretical 50 kb/s and 40,000 devices per base station. LoRa employs spread-spectrum coding, meaning the modem signal is spread over a wider frequency band than normal. This allows better performance in the presence of noise or jamming. The LoRa Alliance was created to foster interoperability between devices.Cellular carriers offer NB-IoT and LTE-M wireless services in licensed frequency bands.
NB-IoT operates on 200 kHz channels, often in the “guard bands”, i.e. unused spectrum between bands used for conventional cellular, supporting around 200 kb/s data rates depending on carrier implementation. It is designed for fixed, ultra-narrow-bandwidth IoT applications. It purports to provide better connectivity in subterranean locations such as basements, utility vaults and sensors located deep within buildings. It does not support mobility, i.e. maintaining connection as the sensor moves out of range of a base station.
LTE-M operates on approximately 1 MHz bands on licensed spectrum, supporting up to 1 Mb/s data rates (depending on carrier implementation), as well as voice and mobility. As the name would suggest, it is intended for existing LTE cellular networks, to provide extended coverage to IoT applications. Due to its lower latency and higher bandwidth than NB-IoT, LTE-M is suited for IoT applications where devices are in motion and real-time data is required.
The sigfox and LoRa systems gained an early market share. Carrier NB-IoT and LTE-M systems are expected to significantly outpace sigfox and LoRa in terms of connected devices going forward.
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