Item | M2M | H2H |
---|---|---|
Delay range | 10 ms ∼several minutes [50] | 250 ms (voice) to few seconds |
(email for example) | ||
Device composition | GSM/UMTS/LTE module, | GSM/UMTS/LTE/Wifi module |
extension slots, USB, memory, CPU, etc. | GPS, Bluetooth, USB, memory, CPU, | |
flash storage, etc. | ||
Packet loss radio | Relatively high [4] | Low |
Mobility | Most of the M2M devices | Humans are very rarely considered |
(90 % according to [90]) | fixed in practical mobile networks | |
are stationary. | ||
Support service | Mainly SMS or data reporting | SMS/voice/Web/multimedia, etc. |
Session duration | Short but more or less frequent [91], | Long but less frequent |
/frequency | depending on the applications: | |
monitoring, transport or others | ||
Uplink | MTC traffic is mainly generated in uplink | Traditionally less traffic in uplink |
but increase rapidly with the flourishing of interactive | ||
applications such as social network | ||
Downlink | Less traffic except for some application | Currently most traffic, for instance, |
requiring interaction between sensors | Web browsing and multimedia | |
and MTC servers, for example | ||
consumer electronics use case | ||
Message size | Generally very short. | Typically big, especially for multimedia and |
In some cases could increase, | real-time transmission | |
for example, if video sequences are uploaded | ||
Number of devices | Hundreds or thousands of devices per base station | At most hundreds of UE, |
typically tens of UEs per base station [15] | ||
Battery life | Up to a few years, | Order of days or weeks, |
requirement | especially for deployment locations | Human could easily recharge their device |
with difficult access | ||
Key metrics | Energy efficiency, latency | Delay, throughput, packet loss |
for user experience |