3 ms·

In a LTE network that is not over its capacity the latency is a bit under 20ms these days in my experience. With 5G this should go down to 1 to 2ms.

by doikor 8y ago

jakecopp 8y ago
What accounts for the difference in these figures? Is it understandable for someone without in depth knowledge or not really?!
- gsich 8y ago
  Latency in LTE is, I think 5 ms. The rest from the delay is normal network delay and not an issue of LTE. So with 5G (with everything else being the same) will reduce the delay by about 4 ms.
- doikor 8y ago
  Not really a network engineer so cant really help with that. The 20ms is just my experience and the 1 to 2ms is the theorical number given by the people designing 5G. Found this writeup but still not really sure beyond improvements to the slot-based framework and higher frequency as being the reasons https://www.edn.com/electronics-blogs/5g-waves/4460346/5G--The-road-to-low-latency https://www.edn.com/electronics-blogs/5g-waves/4460346/5G--T... All these latency numbers vary a lot based on connection quality. As I understand you basically need line of sight for 5G to work at its maximum frequency and will fallback to what is basically 4G when such a connection is not possible. But then again the antennas/stations for 5G should be much smaller and thus easier to deploy closer to the end users.
yaantc 8y ago
Latency will go down with 5G if you pay for it. How much is the big question. There are 3 sides to 5G: - eMBB: massive boradband --- high throughput, mmWaves; - URLLC: ultra reliable and low latency, for industrial applications typically; - mMTC: massive IoT. Cheap and low power. The network can handle all 3, but as a device or user that doesn't mean you'll get all the benefits at the same time, some choice will be required. The reduced latency always has some cost impact. Today the LTE air latency is 4-5 ms, the rest is in the core network. 5G has some air interface changes to reduce the air contribution to 1 ms, in the context of URLLC. For basic users, it'll likely be like LTE (already pretty good). There may be some general improvement if they optimize the core latency for all, but TBC.

In a LTE network that is not over its capacity the latency is a bit under 20ms these days in my experience. With 5G this should go down to 1 to 2ms.

by doikor 8y ago

In a LTE network that is not over its capacity the latency is a bit under 20ms these days in my experience. With 5G this should go down to 1 to 2ms.

jakecopp 8y ago

What accounts for the difference in these figures? Is it understandable for someone without in depth knowledge or not really?!

gsich 8y ago
Latency in LTE is, I think 5 ms. The rest from the delay is normal network delay and not an issue of LTE. So with 5G (with everything else being the same) will reduce the delay by about 4 ms.
doikor 8y ago
Not really a network engineer so cant really help with that. The 20ms is just my experience and the 1 to 2ms is the theorical number given by the people designing 5G. Found this writeup but still not really sure beyond improvements to the slot-based framework and higher frequency as being the reasons https://www.edn.com/electronics-blogs/5g-waves/4460346/5G--The-road-to-low-latency https://www.edn.com/electronics-blogs/5g-waves/4460346/5G--T... All these latency numbers vary a lot based on connection quality. As I understand you basically need line of sight for 5G to work at its maximum frequency and will fallback to what is basically 4G when such a connection is not possible. But then again the antennas/stations for 5G should be much smaller and thus easier to deploy closer to the end users.

yaantc 8y ago

Latency will go down with 5G if you pay for it. How much is the big question. There are 3 sides to 5G: - eMBB: massive boradband --- high throughput, mmWaves; - URLLC: ultra reliable and low latency, for industrial applications typically; - mMTC: massive IoT. Cheap and low power. The network can handle all 3, but as a device or user that doesn't mean you'll get all the benefits at the same time, some choice will be required. The reduced latency always has some cost impact. Today the LTE air latency is 4-5 ms, the rest is in the core network. 5G has some air interface changes to reduce the air contribution to 1 ms, in the context of URLLC. For basic users, it'll likely be like LTE (already pretty good). There may be some general improvement if they optimize the core latency for all, but TBC.