science

RuBee

RuBee 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 RuBee rather than just read about it. In short: RuBee (IEEE standard 1902.1) is a two-way active wireless protocol designed for harsh environments and high-security asset visibility applications. RuBee utilizes longwave signals to send and receive short (128 byte) data packets in a local regional network.

Key takeaways

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

Reference excerpt

RuBee (IEEE standard 1902.1) is a two-way active wireless protocol designed for harsh environments and high-security asset visibility applications. RuBee utilizes longwave signals to send and receive short (128 byte) data packets in a local regional network. The protocol is similar to the IEEE 802 protocols in that RuBee is networked by using on-demand, peer-to-peer and active radiating transceivers. RuBee is different in that it uses a low frequency (131 kHz) carrier.

The IEEE 1902.1 protocol details 1902.1 is the "physical layer" workgroup with 17 corporate members. The work group was formed in late 2006. The final specification was issued as an IEEE standard in March 2009. The standard includes such things as packet encoding and addressing specifications. The protocol has already been in commercial use by several companies, in asset visibility systems and networks. However, IEEE 1902.1 will be used in many sensor network applications, requiring this physical layer standard in order to establish interoperability between manufacturers. A second standard has been drafted 1902.2 for higher level data functions required in Visibility networks. Visibility networks provide the real-time status, pedigree, and location of people, livestock, medical supplies or other high-value assets within a local network. The second standard will address the data-link layers based on existing uses of the RuBee protocol. This standard, which will be essential for the widespread use of RuBee in visibility applications, will support the interoperability of RuBee tags, RuBee chips, RuBee network routers, and other RuBee equipment at the data-link layer.

RuBee tag details A RuBee tag has a 4 bit CPU, 1 to 5 kB of sRAM, a crystal, and a lithium battery with an expected life of ten years. It can optionally have sensors, displays, and buttons. The RuBee protocol is bidirectional, on-demand, and peer-to-peer. It can operate at other frequencies (e.g. 450 kHz) but 131 kHz is the most widely used one. The RuBee protocol uses an IP Address (Internet Protocol Address). A tag may hold data in its own memory (instead or in addition to having data stored on a server). RuBee functions successfully in harsh environments (one or both ends of the communication are near steel or water), with networks consisting of many thousands of tags, and has a range of 1 to 30 m (3 to 100 ft) depending on the antenna configuration. This allows RuBee radio tags function in environments where other radio tags and RFID may have problems. RuBee networks are in use in many visibility applications, including exit-entry detection in high-security government facilities, weapons and small arms in high-security armories, mission-critical specialized tools, smart shelves and racks for high-value assets; and smart entry/exit portals.

RuBee disadvantages and advantages The major disadvantage RuBee has over other protocols is speed and packet size. The RuBee protocol is limited to 1,200 baud in existing applications. The IEEE 1902.1 specifies 1,200 baud. The protocol could go to 9,600 baud with some loss of range. However, most visibility applications work well at 1,200 baud. Packet size is limited to tens to hundreds of bytes. RuBee's design forgoes high bandwidth, and high-speed communication because most visibility applications do not require them. The use of LW magnetic energy brings about a number of advantages:

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with RuBee

Start with the simplest possible case. Write down what RuBee 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 RuBee 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 RuBee 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 RuBee

In research: RuBee 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 RuBee 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: RuBee is common in secondary-school and first-year university syllabi. It links to neighbouring topics Radio-frequency identification, so understanding it makes those chapters shorter.
In everyday life: Look for RuBee 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 RuBee in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what RuBee 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 RuBee out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is RuBee in simple terms?

Why does RuBee 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 RuBee?

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 RuBee.