VOLTE Mute call Increased in our NW Post Carrier BW Change from 5Mhz to 10 Mhz. i have done the sample checks and found that Cells which are having High Mute call are radiating with 12.2 dbm (40 W RRU) RS Power while Previously they were radiating with 15.2 dbm (80 W RRU) RS power . there is no impact on cells where RS Power is same as Before i.e 15.2 dbm.
Now there is no option to change Power on Cells which are radiating with 12.2 dbm due to RRU Power Limitation(40 W). I am Uptilting the antenna as an interim measure to compensate the coverage loss… But what Other Parameter i can look into to Improve Mute calls.
When you double the bandwidth, your RRU transmit power should double if the power spectrum density is same as before. But now your power is limited to 40w, i.e., 46dbm not 12.2dBm, the power spectrum density is only half as before, thus Rx SINR is only half as before.
If you can improve coverage by uptilting the antenna, it means you can improve VOLTE mute call by employing advanced Tx beamforming technique in Rel14.
Features like Data Forwarding at Intra-LTE Handover or Packet Forwarding at S1 HO will reduce the packet loss (in VoLTE late packets are regarded the same as lost) in DL direction at an intra-LTE handover during a voice session.
Packet loss either in UL or DL or both causes your mute calls.