Communication control method, user terminal, and communication apparatus

A user terminal, comprising:

• a processor configured to perform processes of:
• receiving system information for Device to Device (D2D) proximity service, by use of a frequency of a serving cell of the user terminal, from a communication apparatus managing the serving cell;
• and
• performing a discovery procedure in which the user terminal discovers another user terminal, on a basis of the system information, wherein
• the system information includes first information, second information, third information, and fourth information,
• the first information indicates an available frequency for the discovery procedure,
• the second information indicates at least one parameter for calculating transmission power for the discovery procedure,
• the available frequency for the discovery procedure is a frequency different from the frequency of the serving cell,
• the first information is related to a center frequency of a frequency band of the available frequency for the discovery procedure,
• the third information indicates a Public Land Mobile Network (PLMN) identifier for the available frequency, wherein the PLMN identifier indicated by the third information indicates a PLMN different from a PLMN of the user terminal, and
• the fourth information indicates number of times of re-transmissions of a discovery signal to be re-transmitted by one user terminal in the discovery procedure.

A processor, communicatively coupled to a memory including a program stored in the memory, wherein the processor is configured to control a user terminal, and to execute the program stored in the memory to perform processes of:

• receiving system information for Device to Device (D2D) proximity service, by use of a frequency of a serving cell of the user terminal, from a communication apparatus managing the serving cell;
• and
• performing a discovery procedure in which the user terminal discovers another user terminal, on a basis of the system information, wherein
• the system information includes first information, second information, third information, and fourth information,
• the first information indicates an available frequency for the discovery procedure,
• the second information indicates at least one parameter for calculating transmission power for the discovery procedure,
• the available frequency for the discovery procedure is a frequency different from the frequency of the serving cell,
• the first information is related to a center frequency of a frequency band of the available frequency for the discovery procedure,
• the third information indicates a Public Land Mobile Network (PLMN) identifier for the available frequency, wherein the PLMN identifier indicated by the third information indicates a PLMN different from a PLMN of the user terminal, and
• the fourth information indicates number of times of re-transmissions of a discovery signal to be re-transmitted by one user terminal in the discovery procedure.