A communication apparatus is provided. A first radio module communicates with a first communications device in compliance with a first protocol to provide a first wireless communications service. A second radio module communicates with a second communications device in compliance with a second protocol to provide a second wireless communications service. The first radio module further estimates time remaining for the second radio module before a next operation of the first radio module and transmits information regarding the estimated remaining time to the second radio module. The second radio module further schedules operations of the second radio module according to the information regarding the estimated remaining time received from the first radio module.