Airtel Mobile Network Down? (right now in chennai)

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Sorry to go off topic but just wanted to reply to that:

Technically CDMA cell site covers a wider area than a GSM cell site. However, with the advent of WCDMA (3G) & HSPA+ networks, it won't be long before 3G cell sites have better coverage than CDMA.

Also, 3G, HSPA+, LTE networks are far more effecient in handling enormous voice & data traffic (due to greater capacity) that they have more customers worldwide than CDMA customers, which makes them more preferred even when roaming internationally.

Well the main reason for better coverage of CDMA is the lower band frequency that is used by the operators here (450/800 MHz band) while GSM operators(old) using 900 MHz band are having better coverage than newer operators using 1800 MHz band for 2G. Regarding 3G/HSPA+ at the moment it is using the 2100 MHz band which is also not good for longer coverage. It requires nearly 2-3 times more no. of BTS to provide same level of coverage of 2G. And this evident from the fact that either operators are installing BTSes at newer sites or they are putting more no. of devices on the current 2G only BTSes. Though there is no denying in the fact that these 3G sites have much higher voice/data capacity, so no comparison of that to 2G.

The same applies to LTE also, if operators want to maintain those theoretical speed of 80-100 Mbps that they need to have BTS over every 1-2 miles of distance, but if they just want coverage then yes it will cover better distance then current 3G networks. In the end what matters is the spectrum that is used for the transmission as the long distance is possible over lower band spectrum (800 MHz or lower) with lesser no. of cell sites. In these lower bands these newer techs LTE/Wimax both could do anything around 25-35 kms. with single site in theory.
 
Well the main reason for better coverage of CDMA is the lower band frequency that is used by the operators here (450/800 MHz band) while GSM operators(old) using 900 MHz band are having better coverage than newer operators using 1800 MHz band for 2G. Regarding 3G/HSPA+ at the moment it is using the 2100 MHz band which is also not good for longer coverage. It requires nearly 2-3 times more no. of BTS to provide same level of coverage of 2G. And this evident from the fact that either operators are installing BTSes at newer sites or they are putting more no. of devices on the current 2G only BTSes. Though there is no denying in the fact that these 3G sites have much higher voice/data capacity, so no comparison of that to 2G.

Hey many thanks for the info. So you mean the lesser the number in frequency (as in 450 Mhz), the better the coverage? I thought in case of 3G, fewer cell sites would be required.

Any site which can help me understand these concepts better?

Also, the news article below in HT has a line:

“The network architecture has become very complex after the launch of 3G services,” said a former CTO of a large telecom company. “That’s why calls drop frequently on networks that are offering 3G services.

The 3G network is overlayed over the existing 2G network and use the same core network.

http://www.hindustantimes.com/Network-crash-points-to-Airtel-system-loopholes/Article1-694356.aspx
 
Few years back.. i think some operator had fire in his main site and whole Mumbai network went down.And now this.These proves that these operators dont have any backup / disaster recovery setup..... who gives them the ISO certificate?!!
 
yeah... Airtel n/w is down for past 4 hours in chennai...very frustrating !!
 


Its the 3rd time I notice starting around 13th Junebtw.. In my area its ok , its while travelling I notice it mainly
 
Well the main reason for better coverage of CDMA is the lower band frequency that is used by the operators here (450/800 MHz band) while GSM operators(old) using 900 MHz band are having better coverage than newer operators using 1800 MHz band for 2G. Regarding 3G/HSPA+ at the moment it is using the 2100 MHz band which is also not good for longer coverage. It requires nearly 2-3 times more no. of BTS to provide same level of coverage of 2G. And this evident from the fact that either operators are installing BTSes at newer sites or they are putting more no. of devices on the current 2G only BTSes. Though there is no denying in the fact that these 3G sites have much higher voice/data capacity, so no comparison of that to 2G.

The same applies to LTE also, if operators want to maintain those theoretical speed of 80-100 Mbps that they need to have BTS over every 1-2 miles of distance, but if they just want coverage then yes it will cover better distance then current 3G networks. In the end what matters is the spectrum that is used for the transmission as the long distance is possible over lower band spectrum (800 MHz or lower) with lesser no. of cell sites. In these lower bands these newer techs LTE/Wimax both could do anything around 25-35 kms. with single site in theory.
 

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