Method and system for completing a voice call in a cloud-based communication system using a RAN adapter

A method for initiating a call between a first mobile device located at a first communication system utilizing a first Radio Access Network (RAN) and a second mobile device located at a second communication system utilizing a second RAN, the method comprising:

• receiving a call request from the first mobile device at a first RAN Adaptor (RA), the call request comprising a request to complete a call from the first mobile device at the first RAN to with the second mobile device existing at the second RAN, wherein the first RAN utilizes Land-Mobile Radio (LMR) technology designed specifically for law enforcement, fire and medical services to communicate with each other during emergency situations, and the second RAN utilizes a Long-Term Evolution (LTE) technology for cellular systems;
• determining first RAN-specific access parameters for the first mobile device at the first RA;
• sending a call initiation request from the first RA to a cloud-based group call service, the call initiation request including the first RAN-specific access parameters and call initiation information;
• determining second RAN-specific access parameters for the second mobile device at a second RA associated with the second mobile device;
• establishing first resources specific to the first RAN in the first RA;
• establishing second resources specific to the second RAN in the second RA;
• and
• completing, by the cloud-based group call service, the call between the first mobile device and the second mobile device using the first resources and the second resources.

A Radio Access Network (RAN) Adapter (RA) for completing a call between a first mobile device located at a first communication system RAN and a second mobile device located at a second communication system RAN, the RA comprising:

• an input port for receiving a talkgroup call request from the first mobile device, the talkgroup call request comprising a request to complete a talkgroup call from the first mobile device existing at the first RAN within the first communication system to the second mobile device existing at the second RAN within the second communication system, wherein the first RAN utilizes Land-Mobile Radio (LMR) technology designed specifically for law enforcement, fire and medical services to communicate with each other during emergency situations, and the second RAN utilizes a Long-Term Evolution (LTE) technology for cellular systems;
• a processor that performs determining first RAN-specific access parameters for the first mobile device at the first RA;
• an output port for sending a talkgroup call initiation request from the first RA to a cloud-based group call service, the talkgroup call initiation request including the first RAN-specific access parameters and talkgroup call initiation information;
• wherein the processor further performs establishing first resources specific to the first RAN in the first RA;
• and
• wherein the input port further receives a start call message from a cloud-based group call service.