5G - شبکه های سلولی نسل پنجم

5G is the term used to describe the next-generation of mobile networks beyond the 4G LTE mobile networks of today. As of mid-2016 there was no standard so the definition is still very fluid. It is assumed that 5G networks will not become commercially available until the 2020 timeframe.
The International Telecommunications Union (ITU) will be the standards body that releases the final standard, which is also being referred to as International Mobile Telecommunications (IMT)-2020. The 3GPP is the mobile industry standards body that will submit a proposed specification to the ITU to be part of the IMT-2020 standard. Mobile operators and vendors all participate in the 3GPP specification process.
The vision of 5G is becoming clearer as we move closer to 2020. Most experts say 5G will feature network speedsthat are blazingly fast at 20 G/bps or higher and have a latency that is mere milliseconds. Not only will people be connected to each other but so will machines, automobiles, city infrastructure, public safety and more.
5G networks are also expected to have always-on capabilities and be energy efficient, all of which will likely require new protocols and access technologies.
*** SDN is a Stepping Stone
Software-defined networking (SDN) and network functions virtualization (NFV) are going to play a key role for operators as they prepare to migrate from 4G to 5G and scale their networks quickly.
SDN will be necessary for operators to carve virtual “sub-networks” or slices that can be then used for bigger bandwidth applications. That includes video, which might need throughput speeds of 10 Gb/s as well as lower bandwidth applications to connect devices that are less demanding on the network, such as smartwatches.