science

Land mobile service

Land mobile service is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Land mobile service rather than just read about it. In short: Land mobile service (short: LMS) is – in line to ITU Radio Regulations – a mobile service between base stations and land mobile stations, or between land mobile stations. In accordance with ITU Radio Regulations (article 1) variations of this radiocommunication service are classified as follows: Mobile service (article 1.24) Land mobile service (article 1.26) Land mobile-satellite service (article 1.27) Frequency al…

Key takeaways

Land mobile service belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Land mobile service to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Land mobile service from memory before moving on to harder problems.

Reference excerpt

Land mobile service (short: LMS) is – in line to ITU Radio Regulations – a mobile service between base stations and land mobile stations, or between land mobile stations. In accordance with ITU Radio Regulations (article 1) variations of this radiocommunication service are classified as follows: Mobile service (article 1.24)

Land mobile service (article 1.26) Land mobile-satellite service (article 1.27)

Frequency allocation The allocation of radio frequencies is provided according to Article 5 of the ITU Radio Regulations (edition 2012). In order to improve harmonisation in spectrum utilisation, the majority of service-allocations stipulated in this document were incorporated in national Tables of Frequency Allocations and Utilisations which is within the responsibility of the appropriate national administration. The allocation might be primary, secondary, exclusive, and shared.

primary allocation: is indicated by writing in capital letters secondary allocation: is indicated by small letters (see example below) exclusive or shared utilization: is within the responsibility of administrations However, military usage, in bands where there is civil usage, will be in accordance with the ITU Radio Regulations. In NATO countries, military land mobile utilizations will be in accordance with the NATO Joint Civil/Military Frequency Agreement (NJFA).

FCC LMR Narrowbanding Mandate LMR Narrowbanding is the result of an FCC Order issued in December 2004 mandating that all CFR 47 Part 90 business, educational, industrial, public safety, and state and local government VHF (150-174 MHz) and UHF (421-470 MHz) Private Land Mobile Radio (PLMR) licensees operating legacy wideband (25 kHz bandwidth) voice or data/SCADA systems to migrate to narrowband (12.5 kHz bandwidth or equivalent) systems by January 1, 2013.

See also Business Radio Service Land mobile radio system Narrowband Forest Industries Telecommunications Radio station Radiocommunication service

References

External links FCC: Public Safety Radio Service FCC: Industrial/Business Radio Service FCC: Private Land Mobile Radio Narrowbanding Information, Updates, and Licensee Resources

Illustrations

Worked examples

Example 1 — a first encounter with Land mobile service

Start with the simplest possible case. Write down what Land mobile service claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Land mobile service before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Land mobile service ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Land mobile service

In research: Land mobile service appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Land mobile service in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Land mobile service is common in secondary-school and first-year university syllabi. It links to neighbouring topics Mobile services ITU, Radio communications stubs, Radiocommunication services ITU, so understanding it makes those chapters shorter.
In everyday life: Look for Land mobile service outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Land mobile service in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Land mobile service means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Land mobile service out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Land mobile service in simple terms?

Why does Land mobile service matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Land mobile service?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Land mobile service.