Advantages of 700 MHz spectrum over a 2500 MHz spectrum

Just like somebody explained long back... " lower the frequency longer the distance" ...   :-))

Reference : http://sunilmobiletelecom.blogspot.in/2014/08/apt700-700-mhz-band-auction-for-mobile.html

It is a proven theory that a LTE 700 MHz is going to be a killer in case of LTE Services before 450 MHz can make a pitch in the competition. Because many of the major LTE markets are already having strong push to deploy 700 Mhz spectrum.

Both FDD/TDD modes are available in 700 MHz spectrum.

The below pictures are self explanatory of benefits/advantages over other spectrum...

 Figure 1 : Rural LTE Coverage for 700 MHz spectrum

 Figure 2 : Rural LTE Coverage for 2500 MHz spectrum

 Figure 3 : Urban LTE Coverage for 700 MHz spectrum

 Figure 4 : Urban LTE Coverage for 2500 MHz spectrum

 Figure 5 : Urban LTE Coverage comparison for 700 & 2500 MHz spectrum for Rural area

 Figure 6 : Urban LTE Coverage comparison for 700 & 2500 MHz spectrum for Urban area

 Figure 7 : LTE Bands and Frequency Bands

 Figure 8 : LTE Bands and Frequency Bands used by Australian LTE Networks

 Figure 9 : LTE Bands and Frequency Bands used by US LTE Networks

 Figure 10 : LTE Bands and Frequency Bands used by Indian LTE Networks

SG (SIGNALLING GATEWAY)

Reference: http://msc.mpirical.com/mod/forum/discuss.php?d=120

Ericsson :

Ericsson MGW works as SG(W) as well.

They interface HSL/TDM links at one end and SIGTRAN on the other side and perform the signaling transfer over traditional/SIGTRAN networks.

The issue is since SIGTRAN don't carry any SLS bit and MGW performs MTP3 functionality (i.e. reads the message and routes to MSC if the DPC is MSC-Server, Ex : POI Links-ISUP / BSSAP/RANAP ), it looses the balancing control and loads SLS -0 to 7 and leaves SLS-8 to 15 on the TDM Side in the ratio of 75% to 25% of total traffic.



Huawei :


When I observed the same in HUAWEI, they do MTP2 analysis at MGW. All signaling messages are sent to MSC-Server. For GCP protocol huawei uses specific interfaces and never mixes any other traffic like ISUP/SCCP on the same HW.
So their software focuses on the end to end analysis rather than do everything. The outcome there is perfect load balancing at TDM Links side.

A Practical Example of SG(W) Functionality:

The following traces and screenshots show the practical involvement SG(W) functionality.

 

Reference: http://msc.mpirical.com/mod/forum/discuss.php?d=120

 A Mobil Terminating Call Coming from PSTN to Mobile Network where MGW acts as SG(W) (Logical Call Control) :

A Mobil Terminating Call Coming from PSTN to Mobile Network where MGW acts as SG(W) (Phyical Message Flow) :

Note :  Since SGW is an important element in LTE Network, I have updated this post with SG(W) as for Signalling Gateway.