6 ms·
"The United States, meanwhile, enjoyed a 5G maximum speed of 1815Mbps – about three times as fast as 4G users’ maximum speed." This report seems to be lacking
by tpmx 7y ago
"The United States, meanwhile, enjoyed a 5G maximum speed of 1815Mbps – about three times as fast as 4G users’ maximum speed."
This report seems to be lacking a reality check. (Is it practically possible to get ~600 Mbps from LTE? Exotic bundles like LTE MIMO don't really count unless they're actually offered as part of regular plans.)
- stagger87 7y agoAt the 30.72 MS/s rate, 2k FFT size, 1201 subcarriers occupied per FFT, QAM256 on each subcarrier, 4x4 MIMO, you get ~576Mbps max throughput (pure number of bits transferred per second). This ignores encoding, cyclic prefix, and all the other overheads associated with the LTE protocol.
- tpmx 7y agoSo I guess that's where the article author got the "LTE speed". It was probably from some aussie mobile operator's "theoretical maximum speed" number or similar.
- sasaf5 7y agothere's also carrier aggregation, you could multiply that throughput by the number of carrier components provided by the telco (rarely more than 2 or 3).
- djsumdog 7y agoYou pretty much need a direct line-of-sight to the 5G tower, without trees in the way, or clouds: https://www.youtube.com/watch?v=_CTUs_2hq6Y https://www.youtube.com/watch?v=_CTUs_2hq6Y
- GhettoMaestro 7y agoThat video had so much bullshit I had to stop. 1ms ping? Get a clue dumbass. Physics.
- beering 7y agoCan you explain why 1ms ping is not possible because of physics? Otherwise this comment comes off as rather rude and unhelpful.
- superkuh 7y agoI bet he doesn't understand that 5G in the millimeter wave bands will have an effective coverage radius of about that of a street light. At those tiny distances 1ms is possible. But not implemented. ALL current "5G" networks are 5G non-standalone in which 4G does all registiration with the basestation and most of the work. 5G is just a bit of extra data channel on top.
- tedunangst 7y agoSpeed of light is about 300km per ms, which is a bit larger than a typical street light covers. I think we're going to need a few more divisors to get 300km down to 30m.
- linkregister 7y agoNetwork latency is limited by the speed of light.
- freehunter 7y agoYes but the speed of light is very fast. Light can travel nearly 200 miles in one millisecond.
- linkregister 7y agoPlease explain how 5G would overcome the obstacles to 1ms ping better than 4G. Higher bandwidth does not reduce latency for minuscule packets with low contention.
- deleted 7y ago[deleted]
- mcbridematt 7y agoYes, it is possible to get 600Mbps from LTE, but you need lots of mid-band spectrum - the US operators are quite challenged in that respect, plus CPE capable of carrier aggregation + higher MIMO ('flagship' smartphones generally). This article provides a good overview of how the Telstra deployment works: https://cellularinsights.com/telstras-gigabit-class-lte-network-the-work-of-art/ https://cellularinsights.com/telstras-gigabit-class-lte-netw...