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Why does WiFi have a shorter range than LTE?
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It seems confusing that my phone receives -87 dbm LTE signal and shows a full 4 bars with the speeds of
UPLOAD: 20Mbps
DOWNLOAD:13.6Mbps
But my WiFi is showing 1 bar at -89 dbm and I get disconnected as soon as I move slightly away, and speeds are very low.
Why does this happen? It happens with all my phones.
wireless wifi telecommunications
edited Sep 6 at 14:03
psmears
54135
asked Sep 6 at 8:28
ObsessionWithElectricity
19416
 |Â
show 6 more comments
up vote
17
down vote
favorite
It seems confusing that my phone receives -87 dbm LTE signal and shows a full 4 bars with the speeds of
UPLOAD: 20Mbps
DOWNLOAD:13.6Mbps
But my WiFi is showing 1 bar at -89 dbm and I get disconnected as soon as I move slightly away, and speeds are very low.
Why does this happen? It happens with all my phones.
wireless wifi telecommunications
edited Sep 6 at 14:03
psmears
54135
asked Sep 6 at 8:28
ObsessionWithElectricity
19416
7
Just to make sure you are clear, -89dBm is only 67% of the power of -87dBm, which is quite a difference. It's not the answer to your question, but worth noting.
– Tom Carpenter
Sep 6 at 8:34
1
But at -92 dbm LTE shows full bars on my phone.
– ObsessionWithElectricity
Sep 6 at 9:52
13
The "bars" are basically a nice fiction that bears only a very loose relationship to actual reception.
– pjc50
Sep 6 at 14:15
1
@ObsessionWithElectricity No, data speeds have nothing to do with connection quality on WiFi.
– Mast
Sep 6 at 16:05
1
Ok, come on, my connection drops by just moving a few steps away from the router. Remember, I just wanna know why WiFi has poor connection at -89dbm while LTE seems to be fine even at -95dbm
– ObsessionWithElectricity
Sep 6 at 16:10
 |Â
show 6 more comments
up vote
17
down vote
favorite
up vote
17
down vote
favorite
It seems confusing that my phone receives -87 dbm LTE signal and shows a full 4 bars with the speeds of
UPLOAD: 20Mbps
DOWNLOAD:13.6Mbps
But my WiFi is showing 1 bar at -89 dbm and I get disconnected as soon as I move slightly away, and speeds are very low.
Why does this happen? It happens with all my phones.
wireless wifi telecommunications
edited Sep 6 at 14:03
psmears
54135
asked Sep 6 at 8:28
ObsessionWithElectricity
19416
It seems confusing that my phone receives -87 dbm LTE signal and shows a full 4 bars with the speeds of
UPLOAD: 20Mbps
DOWNLOAD:13.6Mbps
But my WiFi is showing 1 bar at -89 dbm and I get disconnected as soon as I move slightly away, and speeds are very low.
Why does this happen? It happens with all my phones.
wireless wifi telecommunications
edited Sep 6 at 14:03
psmears
54135
asked Sep 6 at 8:28
ObsessionWithElectricity
19416
edited Sep 6 at 14:03
psmears
54135
edited Sep 6 at 14:03
psmears
54135
edited Sep 6 at 14:03
psmears
54135
54135
asked Sep 6 at 8:28
ObsessionWithElectricity
19416
asked Sep 6 at 8:28
ObsessionWithElectricity
19416
asked Sep 6 at 8:28
ObsessionWithElectricity
19416
19416
7
Just to make sure you are clear, -89dBm is only 67% of the power of -87dBm, which is quite a difference. It's not the answer to your question, but worth noting.
– Tom Carpenter
Sep 6 at 8:34
1
But at -92 dbm LTE shows full bars on my phone.
– ObsessionWithElectricity
Sep 6 at 9:52
13
The "bars" are basically a nice fiction that bears only a very loose relationship to actual reception.
– pjc50
Sep 6 at 14:15
1
@ObsessionWithElectricity No, data speeds have nothing to do with connection quality on WiFi.
– Mast
Sep 6 at 16:05
1
Ok, come on, my connection drops by just moving a few steps away from the router. Remember, I just wanna know why WiFi has poor connection at -89dbm while LTE seems to be fine even at -95dbm
– ObsessionWithElectricity
Sep 6 at 16:10
 |Â
show 6 more comments
7
Just to make sure you are clear, -89dBm is only 67% of the power of -87dBm, which is quite a difference. It's not the answer to your question, but worth noting.
– Tom Carpenter
Sep 6 at 8:34
1
But at -92 dbm LTE shows full bars on my phone.
– ObsessionWithElectricity
Sep 6 at 9:52
13
The "bars" are basically a nice fiction that bears only a very loose relationship to actual reception.
– pjc50
Sep 6 at 14:15
1
@ObsessionWithElectricity No, data speeds have nothing to do with connection quality on WiFi.
– Mast
Sep 6 at 16:05
1
Ok, come on, my connection drops by just moving a few steps away from the router. Remember, I just wanna know why WiFi has poor connection at -89dbm while LTE seems to be fine even at -95dbm
– ObsessionWithElectricity
Sep 6 at 16:10
7
7
Just to make sure you are clear, -89dBm is only 67% of the power of -87dBm, which is quite a difference. It's not the answer to your question, but worth noting.
– Tom Carpenter
Sep 6 at 8:34
Just to make sure you are clear, -89dBm is only 67% of the power of -87dBm, which is quite a difference. It's not the answer to your question, but worth noting.
– Tom Carpenter
Sep 6 at 8:34
1
1
But at -92 dbm LTE shows full bars on my phone.
– ObsessionWithElectricity
Sep 6 at 9:52
But at -92 dbm LTE shows full bars on my phone.
– ObsessionWithElectricity
Sep 6 at 9:52
13
13
The "bars" are basically a nice fiction that bears only a very loose relationship to actual reception.
– pjc50
Sep 6 at 14:15
The "bars" are basically a nice fiction that bears only a very loose relationship to actual reception.
– pjc50
Sep 6 at 14:15
1
1
@ObsessionWithElectricity No, data speeds have nothing to do with connection quality on WiFi.
– Mast
Sep 6 at 16:05
@ObsessionWithElectricity No, data speeds have nothing to do with connection quality on WiFi.
– Mast
Sep 6 at 16:05
1
1
Ok, come on, my connection drops by just moving a few steps away from the router. Remember, I just wanna know why WiFi has poor connection at -89dbm while LTE seems to be fine even at -95dbm
– ObsessionWithElectricity
Sep 6 at 16:10
Ok, come on, my connection drops by just moving a few steps away from the router. Remember, I just wanna know why WiFi has poor connection at -89dbm while LTE seems to be fine even at -95dbm
– ObsessionWithElectricity
Sep 6 at 16:10
 |Â
show 6 more comments
3 Answers
3
active
oldest
votes
up vote
25
down vote
As with any radio receiver, if it can handle a higher data rate, then it is usually burdened with having a higher RF bandwidth and this inevitably means more received background noise i.e. a wider BW lets in more noise and hence, you need a higher received signal level to operate with a decent SNR (signal to noise ratio).
Therefore WiFi is at a significant disadvantage because it has a wider RF bandwidth than LTE (normally) and needs a higher signal level to operate at a decent bit-error-rate (BER). This is embodied in the following empirical but commonly-found relationship.
Power (dBm) needed by a receiver is -154 dBm + $10log_10$(data rate)
For example, if the WiFi data rate is ten times your LTE data rate, then you need 10 dB more signal to operate at the same SNR. Basically if you double the RF bandwidth you "collect" 3 dB more noise. This means that WiFi is usually the first to suffer as signal levels drop (compared to LTE data rates).
Why WiFi has shorter range than LTE?
This is related to the Friis transmission equation but, more simply, you can think about the same effect with light bulbs; consider a 1000 watt lamp and the distance you could see this at night time - you would probably see it fairly clearly from 10 km away and, if you walked a further 100 metres, it wouldn't look significantly dimmer.
Compared with a small 1 watt lamp, you might see it glowing at 100 metres but, if you walked away a further 100 metres, it would be noticeably dimmer.
There are a bunch of other factors too such as operating frequency - WiFi can operate at a higher carrier frequency and the Friis transmission equation informs you that as frequency rises, the path-loss increases: -
Path loss (dB) = 32.45 + $20log_10$(F in MHz) + $20log_10$(D in kilometres).
In other words at ten times the frequency, the path loss increases by 20 dB.
answered Sep 6 at 9:08
Andy aka
229k9168388
2
My phone carrier is at LTE B40 - 2300-2400Mhz . So I guess there is not much difference in frequencies. I think the reciever of WiFi routers is less sensitive than receiver of BTS of LTE
– ObsessionWithElectricity
Sep 6 at 9:58
3
Also, you don't tend to go and mount your WiFI access point at optimum height on a huge honking pole, unlike commercial mobile carrier equipment :)
– rackandboneman
Sep 6 at 12:11
2
The wifi frequency is irrelevant to a discussion about band width.
– pjc50
Sep 6 at 12:19
2
@rackandboneman: And if you do mount a Wi-Fi access point like that, decent equipment (with a directional antenna like LTE, not omnidirectional like cheap home "routers") can easily reach several km. Long range point-to-point Wi-Fi links are rather common.
– grawity
Sep 6 at 12:26
1
Phone antenna's are generally not heavily directional, or you would expect your phone to lose signal as you changed its orientation. The base stations can be more directional, but they generally still a broad region, potentially doing software based beamforming.
– mbrig
Sep 6 at 20:47
 |Â
show 7 more comments
up vote
8
down vote
in addition to Andy's answers, WIFI is usually limited in power, 30dBm in north America, lower levels in most of the world. LTE usually can transmit up to 4W (36dBm) And the towers transmit at a much higher power.
Also, LTE has much better network management capabilities (automatically finding the best channel and data rate), the towers have much better clock sources than WIFI (this affects receiver sensitivity) and the towers have higher placed antenna (10-30m) than the common wifi router.
answered Sep 6 at 10:38
Lior Bilia
4,30611024
But I heard that LTE transmit upto 200mW in phone's. For towers I don't know. Which is correct 4 W or 200mW?
– ObsessionWithElectricity
Sep 6 at 11:43
4
I'm fairly certain it's 200mW. GSM (2G) used to be 2W, but that was dropped first to 1W and then 500mW. Battery life at 4W would be atrocious. Note that even GSM would use these figures as absolute maximums, and dynamically lower it where possible.
– MSalters
Sep 6 at 12:18
4
Yes, it's 200mW. This paper is interesting: ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7879218 - the average power of the 95th percentile of transmissions was 4mW!
– pjc50
Sep 6 at 12:23
It is up to. The limit is regulatory, not technical. Obviously, you want to use as little power as possible. If you are in an urban setting, with lots of towers, sure your phone will transmit few mW. If you are out in the wilderness, with the nearest tower 5km away from you, your phone will transmit at maximum power.
– Lior Bilia
Sep 6 at 13:31
How much is power emitted by tower of LTE?
– ObsessionWithElectricity
Sep 6 at 15:52
 |Â
show 3 more comments
up vote
0
down vote
For comparison, these are the transceiver part of a LTE network(from two different vendors)(antennas are mounted on towers/poles and connected via cables to the eNodeB), equivalent to the antenna part plus the transceiver circuit of a wifi AP.
https://www.motorolasolutions.com/en_xl/products/lte-broadband-systems/broadband-systems-equipment/enhanced-node-b/rbs6101.html#tabproductinfo
https://www.scribd.com/document/204866576/RBS-6000-Spec-Sheet
A LTE eNodeB can handle hundred of users(depending on configuration) in a controlled manner. How many can a wifi AP handle??? You cannot really compare Wifi to LTE. It is two completely different kind of system meant to be used in quite different scenarios.
answered Sep 7 at 7:57
Strider H
1
New contributor
Strider H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
25
down vote
As with any radio receiver, if it can handle a higher data rate, then it is usually burdened with having a higher RF bandwidth and this inevitably means more received background noise i.e. a wider BW lets in more noise and hence, you need a higher received signal level to operate with a decent SNR (signal to noise ratio).
Therefore WiFi is at a significant disadvantage because it has a wider RF bandwidth than LTE (normally) and needs a higher signal level to operate at a decent bit-error-rate (BER). This is embodied in the following empirical but commonly-found relationship.
Power (dBm) needed by a receiver is -154 dBm + $10log_10$(data rate)
For example, if the WiFi data rate is ten times your LTE data rate, then you need 10 dB more signal to operate at the same SNR. Basically if you double the RF bandwidth you "collect" 3 dB more noise. This means that WiFi is usually the first to suffer as signal levels drop (compared to LTE data rates).
Why WiFi has shorter range than LTE?
This is related to the Friis transmission equation but, more simply, you can think about the same effect with light bulbs; consider a 1000 watt lamp and the distance you could see this at night time - you would probably see it fairly clearly from 10 km away and, if you walked a further 100 metres, it wouldn't look significantly dimmer.
Compared with a small 1 watt lamp, you might see it glowing at 100 metres but, if you walked away a further 100 metres, it would be noticeably dimmer.
There are a bunch of other factors too such as operating frequency - WiFi can operate at a higher carrier frequency and the Friis transmission equation informs you that as frequency rises, the path-loss increases: -
Path loss (dB) = 32.45 + $20log_10$(F in MHz) + $20log_10$(D in kilometres).
In other words at ten times the frequency, the path loss increases by 20 dB.
answered Sep 6 at 9:08
Andy aka
229k9168388
2
My phone carrier is at LTE B40 - 2300-2400Mhz . So I guess there is not much difference in frequencies. I think the reciever of WiFi routers is less sensitive than receiver of BTS of LTE
– ObsessionWithElectricity
Sep 6 at 9:58
3
Also, you don't tend to go and mount your WiFI access point at optimum height on a huge honking pole, unlike commercial mobile carrier equipment :)
– rackandboneman
Sep 6 at 12:11
2
The wifi frequency is irrelevant to a discussion about band width.
– pjc50
Sep 6 at 12:19
2
@rackandboneman: And if you do mount a Wi-Fi access point like that, decent equipment (with a directional antenna like LTE, not omnidirectional like cheap home "routers") can easily reach several km. Long range point-to-point Wi-Fi links are rather common.
– grawity
Sep 6 at 12:26
1
Phone antenna's are generally not heavily directional, or you would expect your phone to lose signal as you changed its orientation. The base stations can be more directional, but they generally still a broad region, potentially doing software based beamforming.
– mbrig
Sep 6 at 20:47
 |Â
show 7 more comments
up vote
25
down vote
As with any radio receiver, if it can handle a higher data rate, then it is usually burdened with having a higher RF bandwidth and this inevitably means more received background noise i.e. a wider BW lets in more noise and hence, you need a higher received signal level to operate with a decent SNR (signal to noise ratio).
Therefore WiFi is at a significant disadvantage because it has a wider RF bandwidth than LTE (normally) and needs a higher signal level to operate at a decent bit-error-rate (BER). This is embodied in the following empirical but commonly-found relationship.
Power (dBm) needed by a receiver is -154 dBm + $10log_10$(data rate)
For example, if the WiFi data rate is ten times your LTE data rate, then you need 10 dB more signal to operate at the same SNR. Basically if you double the RF bandwidth you "collect" 3 dB more noise. This means that WiFi is usually the first to suffer as signal levels drop (compared to LTE data rates).
Why WiFi has shorter range than LTE?
This is related to the Friis transmission equation but, more simply, you can think about the same effect with light bulbs; consider a 1000 watt lamp and the distance you could see this at night time - you would probably see it fairly clearly from 10 km away and, if you walked a further 100 metres, it wouldn't look significantly dimmer.
Compared with a small 1 watt lamp, you might see it glowing at 100 metres but, if you walked away a further 100 metres, it would be noticeably dimmer.
There are a bunch of other factors too such as operating frequency - WiFi can operate at a higher carrier frequency and the Friis transmission equation informs you that as frequency rises, the path-loss increases: -
Path loss (dB) = 32.45 + $20log_10$(F in MHz) + $20log_10$(D in kilometres).
In other words at ten times the frequency, the path loss increases by 20 dB.
answered Sep 6 at 9:08
Andy aka
229k9168388
2
My phone carrier is at LTE B40 - 2300-2400Mhz . So I guess there is not much difference in frequencies. I think the reciever of WiFi routers is less sensitive than receiver of BTS of LTE
– ObsessionWithElectricity
Sep 6 at 9:58
3
Also, you don't tend to go and mount your WiFI access point at optimum height on a huge honking pole, unlike commercial mobile carrier equipment :)
– rackandboneman
Sep 6 at 12:11
2
The wifi frequency is irrelevant to a discussion about band width.
– pjc50
Sep 6 at 12:19
2
@rackandboneman: And if you do mount a Wi-Fi access point like that, decent equipment (with a directional antenna like LTE, not omnidirectional like cheap home "routers") can easily reach several km. Long range point-to-point Wi-Fi links are rather common.
– grawity
Sep 6 at 12:26
1
Phone antenna's are generally not heavily directional, or you would expect your phone to lose signal as you changed its orientation. The base stations can be more directional, but they generally still a broad region, potentially doing software based beamforming.
– mbrig
Sep 6 at 20:47
 |Â
show 7 more comments
up vote
25
down vote
up vote
25
down vote
As with any radio receiver, if it can handle a higher data rate, then it is usually burdened with having a higher RF bandwidth and this inevitably means more received background noise i.e. a wider BW lets in more noise and hence, you need a higher received signal level to operate with a decent SNR (signal to noise ratio).
Therefore WiFi is at a significant disadvantage because it has a wider RF bandwidth than LTE (normally) and needs a higher signal level to operate at a decent bit-error-rate (BER). This is embodied in the following empirical but commonly-found relationship.
Power (dBm) needed by a receiver is -154 dBm + $10log_10$(data rate)
For example, if the WiFi data rate is ten times your LTE data rate, then you need 10 dB more signal to operate at the same SNR. Basically if you double the RF bandwidth you "collect" 3 dB more noise. This means that WiFi is usually the first to suffer as signal levels drop (compared to LTE data rates).
Why WiFi has shorter range than LTE?
This is related to the Friis transmission equation but, more simply, you can think about the same effect with light bulbs; consider a 1000 watt lamp and the distance you could see this at night time - you would probably see it fairly clearly from 10 km away and, if you walked a further 100 metres, it wouldn't look significantly dimmer.
Compared with a small 1 watt lamp, you might see it glowing at 100 metres but, if you walked away a further 100 metres, it would be noticeably dimmer.
There are a bunch of other factors too such as operating frequency - WiFi can operate at a higher carrier frequency and the Friis transmission equation informs you that as frequency rises, the path-loss increases: -
Path loss (dB) = 32.45 + $20log_10$(F in MHz) + $20log_10$(D in kilometres).
In other words at ten times the frequency, the path loss increases by 20 dB.
answered Sep 6 at 9:08
Andy aka
229k9168388
As with any radio receiver, if it can handle a higher data rate, then it is usually burdened with having a higher RF bandwidth and this inevitably means more received background noise i.e. a wider BW lets in more noise and hence, you need a higher received signal level to operate with a decent SNR (signal to noise ratio).
Therefore WiFi is at a significant disadvantage because it has a wider RF bandwidth than LTE (normally) and needs a higher signal level to operate at a decent bit-error-rate (BER). This is embodied in the following empirical but commonly-found relationship.
Power (dBm) needed by a receiver is -154 dBm + $10log_10$(data rate)
For example, if the WiFi data rate is ten times your LTE data rate, then you need 10 dB more signal to operate at the same SNR. Basically if you double the RF bandwidth you "collect" 3 dB more noise. This means that WiFi is usually the first to suffer as signal levels drop (compared to LTE data rates).
Why WiFi has shorter range than LTE?
This is related to the Friis transmission equation but, more simply, you can think about the same effect with light bulbs; consider a 1000 watt lamp and the distance you could see this at night time - you would probably see it fairly clearly from 10 km away and, if you walked a further 100 metres, it wouldn't look significantly dimmer.
Compared with a small 1 watt lamp, you might see it glowing at 100 metres but, if you walked away a further 100 metres, it would be noticeably dimmer.
There are a bunch of other factors too such as operating frequency - WiFi can operate at a higher carrier frequency and the Friis transmission equation informs you that as frequency rises, the path-loss increases: -
Path loss (dB) = 32.45 + $20log_10$(F in MHz) + $20log_10$(D in kilometres).
In other words at ten times the frequency, the path loss increases by 20 dB.
answered Sep 6 at 9:08
Andy aka
229k9168388
edited Sep 6 at 19:14
answered Sep 6 at 9:08
Andy aka
229k9168388
answered Sep 6 at 9:08
Andy aka
229k9168388
answered Sep 6 at 9:08
Andy aka
229k9168388
229k9168388
2
My phone carrier is at LTE B40 - 2300-2400Mhz . So I guess there is not much difference in frequencies. I think the reciever of WiFi routers is less sensitive than receiver of BTS of LTE
– ObsessionWithElectricity
Sep 6 at 9:58
3
Also, you don't tend to go and mount your WiFI access point at optimum height on a huge honking pole, unlike commercial mobile carrier equipment :)
– rackandboneman
Sep 6 at 12:11
2
The wifi frequency is irrelevant to a discussion about band width.
– pjc50
Sep 6 at 12:19
2
@rackandboneman: And if you do mount a Wi-Fi access point like that, decent equipment (with a directional antenna like LTE, not omnidirectional like cheap home "routers") can easily reach several km. Long range point-to-point Wi-Fi links are rather common.
– grawity
Sep 6 at 12:26
1
Phone antenna's are generally not heavily directional, or you would expect your phone to lose signal as you changed its orientation. The base stations can be more directional, but they generally still a broad region, potentially doing software based beamforming.
– mbrig
Sep 6 at 20:47
 |Â
show 7 more comments
2
My phone carrier is at LTE B40 - 2300-2400Mhz . So I guess there is not much difference in frequencies. I think the reciever of WiFi routers is less sensitive than receiver of BTS of LTE
– ObsessionWithElectricity
Sep 6 at 9:58
3
Also, you don't tend to go and mount your WiFI access point at optimum height on a huge honking pole, unlike commercial mobile carrier equipment :)
– rackandboneman
Sep 6 at 12:11
2
The wifi frequency is irrelevant to a discussion about band width.
– pjc50
Sep 6 at 12:19
2
@rackandboneman: And if you do mount a Wi-Fi access point like that, decent equipment (with a directional antenna like LTE, not omnidirectional like cheap home "routers") can easily reach several km. Long range point-to-point Wi-Fi links are rather common.
– grawity
Sep 6 at 12:26
1
Phone antenna's are generally not heavily directional, or you would expect your phone to lose signal as you changed its orientation. The base stations can be more directional, but they generally still a broad region, potentially doing software based beamforming.
– mbrig
Sep 6 at 20:47
2
2
My phone carrier is at LTE B40 - 2300-2400Mhz . So I guess there is not much difference in frequencies. I think the reciever of WiFi routers is less sensitive than receiver of BTS of LTE
– ObsessionWithElectricity
Sep 6 at 9:58
My phone carrier is at LTE B40 - 2300-2400Mhz . So I guess there is not much difference in frequencies. I think the reciever of WiFi routers is less sensitive than receiver of BTS of LTE
– ObsessionWithElectricity
Sep 6 at 9:58
3
3
Also, you don't tend to go and mount your WiFI access point at optimum height on a huge honking pole, unlike commercial mobile carrier equipment :)
– rackandboneman
Sep 6 at 12:11
Also, you don't tend to go and mount your WiFI access point at optimum height on a huge honking pole, unlike commercial mobile carrier equipment :)
– rackandboneman
Sep 6 at 12:11
2
2
The wifi frequency is irrelevant to a discussion about band width.
– pjc50
Sep 6 at 12:19
The wifi frequency is irrelevant to a discussion about band width.
– pjc50
Sep 6 at 12:19
2
2
@rackandboneman: And if you do mount a Wi-Fi access point like that, decent equipment (with a directional antenna like LTE, not omnidirectional like cheap home "routers") can easily reach several km. Long range point-to-point Wi-Fi links are rather common.
– grawity
Sep 6 at 12:26
@rackandboneman: And if you do mount a Wi-Fi access point like that, decent equipment (with a directional antenna like LTE, not omnidirectional like cheap home "routers") can easily reach several km. Long range point-to-point Wi-Fi links are rather common.
– grawity
Sep 6 at 12:26
1
1
Phone antenna's are generally not heavily directional, or you would expect your phone to lose signal as you changed its orientation. The base stations can be more directional, but they generally still a broad region, potentially doing software based beamforming.
– mbrig
Sep 6 at 20:47
Phone antenna's are generally not heavily directional, or you would expect your phone to lose signal as you changed its orientation. The base stations can be more directional, but they generally still a broad region, potentially doing software based beamforming.
– mbrig
Sep 6 at 20:47
 |Â
show 7 more comments
up vote
8
down vote
in addition to Andy's answers, WIFI is usually limited in power, 30dBm in north America, lower levels in most of the world. LTE usually can transmit up to 4W (36dBm) And the towers transmit at a much higher power.
Also, LTE has much better network management capabilities (automatically finding the best channel and data rate), the towers have much better clock sources than WIFI (this affects receiver sensitivity) and the towers have higher placed antenna (10-30m) than the common wifi router.
answered Sep 6 at 10:38
Lior Bilia
4,30611024
But I heard that LTE transmit upto 200mW in phone's. For towers I don't know. Which is correct 4 W or 200mW?
– ObsessionWithElectricity
Sep 6 at 11:43
4
I'm fairly certain it's 200mW. GSM (2G) used to be 2W, but that was dropped first to 1W and then 500mW. Battery life at 4W would be atrocious. Note that even GSM would use these figures as absolute maximums, and dynamically lower it where possible.
– MSalters
Sep 6 at 12:18
4
Yes, it's 200mW. This paper is interesting: ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7879218 - the average power of the 95th percentile of transmissions was 4mW!
– pjc50
Sep 6 at 12:23
It is up to. The limit is regulatory, not technical. Obviously, you want to use as little power as possible. If you are in an urban setting, with lots of towers, sure your phone will transmit few mW. If you are out in the wilderness, with the nearest tower 5km away from you, your phone will transmit at maximum power.
– Lior Bilia
Sep 6 at 13:31
How much is power emitted by tower of LTE?
– ObsessionWithElectricity
Sep 6 at 15:52
 |Â
show 3 more comments
up vote
8
down vote
in addition to Andy's answers, WIFI is usually limited in power, 30dBm in north America, lower levels in most of the world. LTE usually can transmit up to 4W (36dBm) And the towers transmit at a much higher power.
Also, LTE has much better network management capabilities (automatically finding the best channel and data rate), the towers have much better clock sources than WIFI (this affects receiver sensitivity) and the towers have higher placed antenna (10-30m) than the common wifi router.
answered Sep 6 at 10:38
Lior Bilia
4,30611024
But I heard that LTE transmit upto 200mW in phone's. For towers I don't know. Which is correct 4 W or 200mW?
– ObsessionWithElectricity
Sep 6 at 11:43
4
I'm fairly certain it's 200mW. GSM (2G) used to be 2W, but that was dropped first to 1W and then 500mW. Battery life at 4W would be atrocious. Note that even GSM would use these figures as absolute maximums, and dynamically lower it where possible.
– MSalters
Sep 6 at 12:18
4
Yes, it's 200mW. This paper is interesting: ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7879218 - the average power of the 95th percentile of transmissions was 4mW!
– pjc50
Sep 6 at 12:23
It is up to. The limit is regulatory, not technical. Obviously, you want to use as little power as possible. If you are in an urban setting, with lots of towers, sure your phone will transmit few mW. If you are out in the wilderness, with the nearest tower 5km away from you, your phone will transmit at maximum power.
– Lior Bilia
Sep 6 at 13:31
How much is power emitted by tower of LTE?
– ObsessionWithElectricity
Sep 6 at 15:52
 |Â
show 3 more comments
up vote
8
down vote
up vote
8
down vote
in addition to Andy's answers, WIFI is usually limited in power, 30dBm in north America, lower levels in most of the world. LTE usually can transmit up to 4W (36dBm) And the towers transmit at a much higher power.
Also, LTE has much better network management capabilities (automatically finding the best channel and data rate), the towers have much better clock sources than WIFI (this affects receiver sensitivity) and the towers have higher placed antenna (10-30m) than the common wifi router.
answered Sep 6 at 10:38
Lior Bilia
4,30611024
in addition to Andy's answers, WIFI is usually limited in power, 30dBm in north America, lower levels in most of the world. LTE usually can transmit up to 4W (36dBm) And the towers transmit at a much higher power.
Also, LTE has much better network management capabilities (automatically finding the best channel and data rate), the towers have much better clock sources than WIFI (this affects receiver sensitivity) and the towers have higher placed antenna (10-30m) than the common wifi router.
answered Sep 6 at 10:38
Lior Bilia
4,30611024
answered Sep 6 at 10:38
Lior Bilia
4,30611024
answered Sep 6 at 10:38
Lior Bilia
4,30611024
answered Sep 6 at 10:38
Lior Bilia
4,30611024
4,30611024
But I heard that LTE transmit upto 200mW in phone's. For towers I don't know. Which is correct 4 W or 200mW?
– ObsessionWithElectricity
Sep 6 at 11:43
4
I'm fairly certain it's 200mW. GSM (2G) used to be 2W, but that was dropped first to 1W and then 500mW. Battery life at 4W would be atrocious. Note that even GSM would use these figures as absolute maximums, and dynamically lower it where possible.
– MSalters
Sep 6 at 12:18
4
Yes, it's 200mW. This paper is interesting: ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7879218 - the average power of the 95th percentile of transmissions was 4mW!
– pjc50
Sep 6 at 12:23
It is up to. The limit is regulatory, not technical. Obviously, you want to use as little power as possible. If you are in an urban setting, with lots of towers, sure your phone will transmit few mW. If you are out in the wilderness, with the nearest tower 5km away from you, your phone will transmit at maximum power.
– Lior Bilia
Sep 6 at 13:31
How much is power emitted by tower of LTE?
– ObsessionWithElectricity
Sep 6 at 15:52
 |Â
show 3 more comments
But I heard that LTE transmit upto 200mW in phone's. For towers I don't know. Which is correct 4 W or 200mW?
– ObsessionWithElectricity
Sep 6 at 11:43
4
I'm fairly certain it's 200mW. GSM (2G) used to be 2W, but that was dropped first to 1W and then 500mW. Battery life at 4W would be atrocious. Note that even GSM would use these figures as absolute maximums, and dynamically lower it where possible.
– MSalters
Sep 6 at 12:18
4
Yes, it's 200mW. This paper is interesting: ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7879218 - the average power of the 95th percentile of transmissions was 4mW!
– pjc50
Sep 6 at 12:23
It is up to. The limit is regulatory, not technical. Obviously, you want to use as little power as possible. If you are in an urban setting, with lots of towers, sure your phone will transmit few mW. If you are out in the wilderness, with the nearest tower 5km away from you, your phone will transmit at maximum power.
– Lior Bilia
Sep 6 at 13:31
How much is power emitted by tower of LTE?
– ObsessionWithElectricity
Sep 6 at 15:52
But I heard that LTE transmit upto 200mW in phone's. For towers I don't know. Which is correct 4 W or 200mW?
– ObsessionWithElectricity
Sep 6 at 11:43
But I heard that LTE transmit upto 200mW in phone's. For towers I don't know. Which is correct 4 W or 200mW?
– ObsessionWithElectricity
Sep 6 at 11:43
4
4
I'm fairly certain it's 200mW. GSM (2G) used to be 2W, but that was dropped first to 1W and then 500mW. Battery life at 4W would be atrocious. Note that even GSM would use these figures as absolute maximums, and dynamically lower it where possible.
– MSalters
Sep 6 at 12:18
I'm fairly certain it's 200mW. GSM (2G) used to be 2W, but that was dropped first to 1W and then 500mW. Battery life at 4W would be atrocious. Note that even GSM would use these figures as absolute maximums, and dynamically lower it where possible.
– MSalters
Sep 6 at 12:18
4
4
Yes, it's 200mW. This paper is interesting: ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7879218 - the average power of the 95th percentile of transmissions was 4mW!
– pjc50
Sep 6 at 12:23
Yes, it's 200mW. This paper is interesting: ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7879218 - the average power of the 95th percentile of transmissions was 4mW!
– pjc50
Sep 6 at 12:23
It is up to. The limit is regulatory, not technical. Obviously, you want to use as little power as possible. If you are in an urban setting, with lots of towers, sure your phone will transmit few mW. If you are out in the wilderness, with the nearest tower 5km away from you, your phone will transmit at maximum power.
– Lior Bilia
Sep 6 at 13:31
It is up to. The limit is regulatory, not technical. Obviously, you want to use as little power as possible. If you are in an urban setting, with lots of towers, sure your phone will transmit few mW. If you are out in the wilderness, with the nearest tower 5km away from you, your phone will transmit at maximum power.
– Lior Bilia
Sep 6 at 13:31
How much is power emitted by tower of LTE?
– ObsessionWithElectricity
Sep 6 at 15:52
How much is power emitted by tower of LTE?
– ObsessionWithElectricity
Sep 6 at 15:52
 |Â
show 3 more comments
up vote
0
down vote
For comparison, these are the transceiver part of a LTE network(from two different vendors)(antennas are mounted on towers/poles and connected via cables to the eNodeB), equivalent to the antenna part plus the transceiver circuit of a wifi AP.
https://www.motorolasolutions.com/en_xl/products/lte-broadband-systems/broadband-systems-equipment/enhanced-node-b/rbs6101.html#tabproductinfo
https://www.scribd.com/document/204866576/RBS-6000-Spec-Sheet
A LTE eNodeB can handle hundred of users(depending on configuration) in a controlled manner. How many can a wifi AP handle??? You cannot really compare Wifi to LTE. It is two completely different kind of system meant to be used in quite different scenarios.
answered Sep 7 at 7:57
Strider H
1
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Strider H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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add a comment |Â
up vote
0
down vote
For comparison, these are the transceiver part of a LTE network(from two different vendors)(antennas are mounted on towers/poles and connected via cables to the eNodeB), equivalent to the antenna part plus the transceiver circuit of a wifi AP.
https://www.motorolasolutions.com/en_xl/products/lte-broadband-systems/broadband-systems-equipment/enhanced-node-b/rbs6101.html#tabproductinfo
https://www.scribd.com/document/204866576/RBS-6000-Spec-Sheet
A LTE eNodeB can handle hundred of users(depending on configuration) in a controlled manner. How many can a wifi AP handle??? You cannot really compare Wifi to LTE. It is two completely different kind of system meant to be used in quite different scenarios.
answered Sep 7 at 7:57
Strider H
1
New contributor
Strider H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
up vote
0
down vote
up vote
0
down vote
For comparison, these are the transceiver part of a LTE network(from two different vendors)(antennas are mounted on towers/poles and connected via cables to the eNodeB), equivalent to the antenna part plus the transceiver circuit of a wifi AP.
https://www.motorolasolutions.com/en_xl/products/lte-broadband-systems/broadband-systems-equipment/enhanced-node-b/rbs6101.html#tabproductinfo
https://www.scribd.com/document/204866576/RBS-6000-Spec-Sheet
A LTE eNodeB can handle hundred of users(depending on configuration) in a controlled manner. How many can a wifi AP handle??? You cannot really compare Wifi to LTE. It is two completely different kind of system meant to be used in quite different scenarios.
answered Sep 7 at 7:57
Strider H
1
New contributor
Strider H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
For comparison, these are the transceiver part of a LTE network(from two different vendors)(antennas are mounted on towers/poles and connected via cables to the eNodeB), equivalent to the antenna part plus the transceiver circuit of a wifi AP.
https://www.motorolasolutions.com/en_xl/products/lte-broadband-systems/broadband-systems-equipment/enhanced-node-b/rbs6101.html#tabproductinfo
https://www.scribd.com/document/204866576/RBS-6000-Spec-Sheet
A LTE eNodeB can handle hundred of users(depending on configuration) in a controlled manner. How many can a wifi AP handle??? You cannot really compare Wifi to LTE. It is two completely different kind of system meant to be used in quite different scenarios.
answered Sep 7 at 7:57
Strider H
1
New contributor
Strider H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered Sep 7 at 7:57
Strider H
1
New contributor
Strider H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered Sep 7 at 7:57
Strider H
1
answered Sep 7 at 7:57
Strider H
1
1
New contributor
Strider H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Strider H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Strider H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
add a comment |Â
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7
Just to make sure you are clear, -89dBm is only 67% of the power of -87dBm, which is quite a difference. It's not the answer to your question, but worth noting.
– Tom Carpenter
Sep 6 at 8:34
1
But at -92 dbm LTE shows full bars on my phone.
– ObsessionWithElectricity
Sep 6 at 9:52
13
The "bars" are basically a nice fiction that bears only a very loose relationship to actual reception.
– pjc50
Sep 6 at 14:15
1
@ObsessionWithElectricity No, data speeds have nothing to do with connection quality on WiFi.
– Mast
Sep 6 at 16:05
1
Ok, come on, my connection drops by just moving a few steps away from the router. Remember, I just wanna know why WiFi has poor connection at -89dbm while LTE seems to be fine even at -95dbm
– ObsessionWithElectricity
Sep 6 at 16:10