I'd be amazed that anything with a GPS in it would last seven days, never mind any other radios that are in it.
We Can Stop Pretending LTE-M Is a Low-Power WAN
51–60 of 66 posts
Re: We Can Stop Pretending LTE-M Is a Low-Power WAN
#52Earlier quoted context omitted.
Claimed pole to pole coverage tells me this is based on an embedded Iridium SBD modem.
Nope, it is our home made solution, with our own frequencies and satellites.
What are the NORAD IDs for your satellites, and TLEs?
edit: https://space.skyrocket.de/doc_sdat/hiber-1.htm
edit: https://www.satellitetoday.com/ground-systems/2018/08/08/dut...
Absolutely makes sense you're working with Kongsberg for earth station services, since their facilities are well positioned for uplink/downlink from polar orbit and highly inclined orbit LEO satellites.
Re: We Can Stop Pretending LTE-M Is a Low-Power WAN
#53Earlier quoted context omitted.
If you want to experiment with LoRaWAN, we open sourced our Network Service: https://github.com/exploratoryengineering/congress We also open sourced our module design (EE-02) that uses nRF52 as the MCU: https://github.com/ExploratoryEngineering/ee0x-hardware You can buy the modules here, but I think stocks might be running low. (However, if anyone needs larger numbers of modules we can put you into contact with the f…
Nice!! Cool that it's open hardware. What's your business model considering you don't want someone buying large numbers from you? :-)
You have no idea how often I am asked that :-)
We work for a telco, and this was just a learning exercise to understand the opportunities and challenges with LPWA. While waiting for NB-IoT chipsets and network rollout. We mostly set up the shop to have a orderly way for people to get the devices from us if they want to experiment (free stuff has a tendency to end up lining people's drawers unused)
We built everything from (and including) the devices to the applications, and everything inbetween minus the LoRa gateway. The attitude being "okay we can read a bunch of datasheets and PPT-decks, but we're not going know anything unless we get hands on". So we did.
The modules were just to get the radio and MCU bits into a reusable module which we then used for about a dozen or so prototypes. We run Apache MyNewt on them (the EE-02 was actually used to develop LoRa support for MyNewt).
Since Nordic Semiconductor are in the same building the nRF52 was a pretty obvious choice (I think we might have been the first customer). They make lovely chips. And I'm not getting paid to say that :-).
We did think about building a gateway as well, but we felt it didn't add much to the exercise.
And now? Now we are doing the whole exercise again for NB-IoT, but this time it is to apply what we've learnt. That being said: we plan to open source stuff in the future. Both hardware and software.
Re: We Can Stop Pretending LTE-M Is a Low-Power WAN
#54Earlier quoted context omitted.
If you want to experiment with LoRaWAN, we open sourced our Network Service: https://github.com/exploratoryengineering/congress We also open sourced our module design (EE-02) that uses nRF52 as the MCU: https://github.com/ExploratoryEngineering/ee0x-hardware You can buy the modules here, but I think stocks might be running low. (However, if anyone needs larger numbers of modules we can put you into contact with the f…
Can you recommend a good write up on LoraWan architecture? (Curious about the need for a network service). Cheers!
The LoraWAN spec is surprisingly good. Dense as a bucket of lead shot, but usable to write an implementation :-)). https://lora-alliance.org/sites/default/files/2018-04/lorawa...
The short version is that all the intelligence is in the Network Service. The gateways are mostly resposible for converting packets into RF and RF into packets. Gateways talk to the network service through some backhaul (ethernet, wifi, 4G etc).
(The Network Service is implemented in Go. The frontend is in a separate repository and done in vue.js)
Re: We Can Stop Pretending LTE-M Is a Low-Power WAN
#55Earlier quoted context omitted.
If you think so, you've to state what the power use was of the chipsets you've used. For example the well-known nRF51: https://devzone.nordicsemi.com/f/nordic-q-a/1657/how-to-mini... . It can be as low as 20 uA. Between advertisements 4 uA.
Er, what relevance does BLE power consumption have to LTE-M, NBIOT, etc.?
Mmm. That's the thesis of the article?
"This mobile tracker is seemingly designed to resemble a popular Bluetooth tracker and sports a LTE-M radio and GPS receiver. But as mentioned here and here, a leopard can’t change its spots."
They try to be as low power as a Bluetooth tracker, but they just can't. It will never be actually low power.
Re: We Can Stop Pretending LTE-M Is a Low-Power WAN
#56Earlier quoted context omitted.
If you think so, you've to state what the power use was of the chipsets you've used. For example the well-known nRF51: https://devzone.nordicsemi.com/f/nordic-q-a/1657/how-to-mini... . It can be as low as 20 uA. Between advertisements 4 uA.
its down to duty cycle. That figure is the average consumption. I can make most chipsets consume 20uA, its trivial, just don't take them out of hibernation. LTE-M is a high(well couple of kilobytes per second) bandwidth, full duplex, high duty cycle transport layer. Not only that, its relatively long distance (well kinda) Bluetooth is short range Lora has a maximum duty cycle of something like 5% (ie it has to be not…
You won't be able to achieve the BLE figures with cellular technology. (Even without GPS. )
You just basically say so by explaining how much higher the bandwidth is.
The thesis of the author of this article still stands. It's not just GPS.
Re: We Can Stop Pretending LTE-M Is a Low-Power WAN
#57Earlier quoted context omitted.
Nice!! Cool that it's open hardware. What's your business model considering you don't want someone buying large numbers from you? :-)
You have no idea how often I am asked that :-) We work for a telco, and this was just a learning exercise to understand the opportunities and challenges with LPWA. While waiting for NB-IoT chipsets and network rollout. We mostly set up the shop to have a orderly way for people to get the devices from us if they want to experiment (free stuff has a tendency to end up lining people's drawers unused) We built everything…
Nice! How can we stay up to date?
Re: We Can Stop Pretending LTE-M Is a Low-Power WAN
#58I'd be amazed that anything with a GPS in it would last seven days, never mind any other radios that are in it.
How about a LPWAN endpoint with GPS that last 2+ years? Like this: http://bit.ly/2pBcYqp
Re: We Can Stop Pretending LTE-M Is a Low-Power WAN
#59Earlier quoted context omitted.
its down to duty cycle. That figure is the average consumption. I can make most chipsets consume 20uA, its trivial, just don't take them out of hibernation. LTE-M is a high(well couple of kilobytes per second) bandwidth, full duplex, high duty cycle transport layer. Not only that, its relatively long distance (well kinda) Bluetooth is short range Lora has a maximum duty cycle of something like 5% (ie it has to be not…
You won't be able to achieve the BLE figures with cellular technology. (Even without GPS. ) You just basically say so by explaining how much higher the bandwidth is. The thesis of the author of this article still stands. It's not just GPS.
I can, if I don't turn it on, which is where the 20uA figure comes from, keeping the device in hibernation
Re: We Can Stop Pretending LTE-M Is a Low-Power WAN
#60Earlier quoted context omitted.
You have no idea how often I am asked that :-) We work for a telco, and this was just a learning exercise to understand the opportunities and challenges with LPWA. While waiting for NB-IoT chipsets and network rollout. We mostly set up the shop to have a orderly way for people to get the devices from us if they want to experiment (free stuff has a tendency to end up lining people's drawers unused) We built everything…
Nice! How can we stay up to date?
We have a blog where the team occasionally posts updates.