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(1) (5th Generation) The fifth version of a product or system. For example, the Video iPod was the 5th iPod model, sometimes called "5G iPod."

(2) (5 GHz Wi-Fi band) After the turn of the century, 5G became widespread after version 802.11a of Wi-Fi debuted. For details, see 5 GHz band.

(3) (5th Generation cellular) 5G is the fifth generation of cellular service, superseding but compatible with 4G LTE. Governed by the 3GPP, 5G increases transmission speed dramatically and embraces prioritization. As video calling and video streaming increase exponentially, real-time content must be given a higher priority than Web pages.

A potential business disrupter, 5G is intended not only for mobile phones, but for in-home Internet access, especially in rural communities where new cable and fiber installations are costly.

Frequencies, Small Cells and Micro Towers
5G operates in a variety of frequency bands from as low as 600 MHz to as high as 71 GHz. Because high frequencies do not propagate as well as low frequencies, the higher 5G frequency deployments require many small cells with micro towers mounted on telephone poles. See 5G frequency bands and 5G radiation.

5G NR (5G New Radio)
The 5G air interface, which like 4G also uses OFDM modulation, was designed to deliver data rates up to 20 Gbps, enabling individual users to get gigabit-per-second downloads over the air. Qualcomm was the first manufacturer to release a 5G radio chip, and in late 2018, Verizon was the first carrier to deploy in-home 5G. In 2019, 5G phones emerged. See OFDM.

It Will Take a While
5G is also expected to provide a huge boost for connecting billions of IoT devices (see Internet of Things). In addition, 5G may make wireless virtual reality (VR) and augmented reality (AR) commonplace. However, nationwide in-home and mobile service should take several more years. See virtual reality and augmented reality.

5G, 4G and Wi-Fi
5G is compatible with 4G cellular and Wi-Fi, offering a seamless experience for users no matter where they are. In addition, like Wi-Fi, 5G was designed to operate in unlicensed spectrum, which greatly broadens its utility. See cellular generations, millimeter wave and 6Genesis.
References in classic literature ?
And taking down the little lamp, he lit a candle, and bowing low to her went into the small cell beyond the partition, and she heard him begin to move something about there.
The attic, which was the secretary's private place (and rather a small cell for so large a hermit), had indeed all the vestiges of a violent drama.
Then the Brownies bore him to a high, dark rock, and, entering a little door, led him to a small cell, dimly lighted by a crevice through which came a single gleam of sunlight; and there, through long, long days, poor Thistle sat alone, and gazed with wistful eyes at the little opening, longing to be out on the green earth.
In order to live a quieter life, the good man put on the robe of a dervish, and divided his house into a quantity of small cells, where he soon established a number of other dervishes.
These were down under the castle's foundations, and mainly were small cells hollowed out of the living rock.
- Tecentriq, an Anti-PD-L1 Antibody, Receives Approval for Additional Indication of Extensive-Stage Small Cell Lung Cancer
M2 PRESSWIRE-August 19, 2019-: Small Cell Power Amplifier Market To Witness An Exponential CAGR Owing To The Increasing Demand For Flawless Transmission And Reception Till 2028 | Million Insights
Dense Air & Dublin City Council have won the 2019 Small Cell Forum Award for Social Impact -- 'Promoting Small Cells for Social/Economic/Environmental Development', following successful completion of the first phase of a 5G research and development network in Dublin's Docklands delivered as part of the Dublin City Council (DCC) 'Smart Docklands' initiative, the company said.
For example, the short broadcast area of 5G means that similar frequencies used by one small cell to connect with customer devices could be reused in a different area to serve other customers.
"Distributed antenna systems, or 'DAS' networks, and other 'small cell' systems use components that are smaller structures," Danielson said.
By introducing this technology in small cell networks, green telecommunication can be realized and small cells can be deployed even when a power grid is not available.
[UKPRwire, Wed Oct 10 2018] Key companies to name in the global market for small cell power amplifier are Broadcom Corp., Texas Instruments, Skywork Solutions, NXP Semiconductors, Qorvo Inc., Anadigics Inc., and Tektelic Communication Inc.