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# What are the meaning for signal strength -91dBm 6asu

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February 10, 2013 11:56:08 AM

What does it means by 6 asu? When we check in the network signal strength for the mobile RSSI, it will appeared the signal strength -xx dBm x asu. I wanted to know what are the asu means?

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a b Ë Android
February 10, 2013 2:23:27 PM
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In a 3G network your cell phone tries to open three channels to three radios so they can locate you and hand you off properly.

Those three channels make up your ACTIVE SET.

ASU is ACTIVE SET UPDATES or the rate at which your phone is able to update its location to the towers/radios.

This rate is affected by signal strength, load, and probably a lot of other factors that I haven't puzzled out yet.
February 11, 2013 12:19:31 AM

Apanzee said:
In a 3G network your cell phone tries to open three channels to three radios so they can locate you and hand you off properly.

Those three channels make up your ACTIVE SET.

ASU is ACTIVE SET UPDATES or the rate at which your phone is able to update its location to the towers/radios.

This rate is affected by signal strength, load, and probably a lot of other factors that I haven't puzzled out yet.

apanzee - thanks for your info, btw what are the higher (stronger) value and minimal value for ASU, I saw the value is always fluctuated whenever the RSSI fluctuated too. Thanks
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a b Ë Android
February 11, 2013 1:13:32 AM

I would assume the minimal value is 0, say you turn your phone on airplane mode and disable all wireless communication - I'm not sure what the max value would be.
February 18, 2013 1:54:30 AM

September 28, 2013 8:24:19 AM

Arbitrary Strength Unit (ASU) is an integer value proportional to the received signal strength measured by the mobile phone.
It is possible to calculate the real signal strength measured in dBm (and thereby power in Watts) by a formula. However, there are different formulas for 2G and 3G networks.
In GSM networks, ASU is equal to the RSSI (received signal strength indicator, see TS 27.007 sub clause 8.5).
dBm = 2 × ASU - 113, ASU in the range of 0..31 and 99 (for not known or not detectable)

It is widely misbelieved[by whom?] that ASU = "Active Set update". The Active Set Update is a signalling message used in handover procedures of UMTS and CDMA mobile telephony standards. On Android phones, the acronym ASU has nothing to do with Active Set Update. It has not been declared precisely by Google developers.[1]

Source:-http://en.wikipedia.org/wiki/Mobile_phone_signal

zeynalden said:
Apanzee said:
In a 3G network your cell phone tries to open three channels to three radios so they can locate you and hand you off properly.

Those three channels make up your ACTIVE SET.

ASU is ACTIVE SET UPDATES or the rate at which your phone is able to update its location to the towers/radios.

This rate is affected by signal strength, load, and probably a lot of other factors that I haven't puzzled out yet.

apanzee - thanks for your info, btw what are the higher (stronger) value and minimal value for ASU, I saw the value is always fluctuated whenever the RSSI fluctuated too. Thanks

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