Method for controlling call capacity in a mobile network

An apparatus comprising:

• a processor;
• and
• a memory including computer program code;
• the memory and the computer program code configured to, with the processor, cause the apparatus
• to activate a mass event mode in a first cell of a first base station, wherein the first cell is a high frequency band cell, and wherein operating in the mass event mode comprises:
• to check if any low frequency band cells are available in a first sector served by the first cell;
• and
• responsive to detecting that one or more low frequency band cells are available, to switch, at least some, voice call connections of users of the first cell to at least some of the available low frequency band cells, wherein the first cell uses 4G or 5G technology and checking if any low frequency band cells are available in the first sector served by the first cell comprises:
• checking if any VoLTE and/or VoNR capable low frequency band cells are available in the first sector and responsive to detecting that one or more VoLTE and/or VoNR capable low frequency band cells are available, the switching of at least some voice call connections of the users of the first cell to at least some of the available low frequency band cells comprises:
• responsive to detecting that one or more VoLTE and/or VoNR capable low frequency band cells are available, switching, at least some, voice call connections to VoLTE and/or VoNR connections of the low frequency band cells;
• or
• optionally switching a first part of the voice call connections of the first cell to VoLTE and/or VoNR connections of the available low frequency band cells and a second part of the voice call connections of the first cell to one or more 2G cells.

A computer program comprising computer executable program code on a non-transitory computer readable medium which when executed by a processor causes an apparatus to perform:

• activating a mass event mode in a first cell of a first base station, wherein the first cell is a high frequency band cell, and wherein operating in the mass event mode comprises:
• checking if any low frequency band cells are available in a first sector served by the first cell;
• and
• responsive to detecting that one or more low frequency band cells are available, switching, at least some, voice call connections of users of the first cell to at least some of the available low frequency band cells, wherein the first cell uses 4G or 5G technology and checking if any low frequency band cells are available in the first sector served by the first cell comprises:
• checking if any VoLTE and/or VoNR capable low frequency band cells are available in the first sector and responsive to detecting that one or more VoLTE and/or VoNR capable low frequency band cells are available, the switching of at least some voice call connections of the users of the first cell to at least some of the available low frequency band cells comprises:
• responsive to detecting that one or more VoLTE and/or VoNR capable low frequency band cells are available, switching, at least some, voice call connections to VoLTE and/or VoNR connections of the low frequency band cells;
• or
• optionally switching a first part of the voice call connections of the first cell to VoLTE and/or VoNR connections of the available low frequency band cells and a second part of the voice call connections of the first cell to one or more 2G cells.