Terminal apparatus, base station apparatus, communication method, and integrated circuit

A base station apparatus for cellular communications, the base station apparatus comprising:

• a transmitter configured to transmit, to a terminal apparatus, multiple pieces of on-demand System Information (SI) and non-demand SI;
• and
• a receiver configured to receive, from the terminal apparatus, a system information request by using either a Physical Random Access Channel (PRACH) or a Physical Uplink Shared Channel (PUSCH), the system information request being to request transmission of a first piece of on-demand SI among the multiple pieces of on-demand SI,
• wherein the receiver is configured to receive the system information request to request transmission of the first piece of on-demand SI, in a resource belonging to a first set of resources corresponding to the first piece of on-demand SI among multiple sets of resources for transmission of the system information request, by using the PRACH in a case that the non-demand SI includes information for indicating the first set of resources among the multiple sets of resources,
• and to receive the system information request by using the PUSCH unless the non-demand SI includes the information, and
• wherein the transmitter is configured to transmit the non-demand SI regardless of the system information request.

A communication method used for a terminal apparatus, the communication method comprising the steps of:

• receiving, from a base station, multiple pieces of on-demand System Information (SI) and non-demand SI;
• and
• transmitting, to the base station, a system information request by using either a Physical Random Access Channel (PRACH) or a Physical Uplink Shared Channel (PUSCH), the system information request being to request transmission of a first piece of on-demand SI among the multiple pieces of on-demand SI, wherein
• the system information request to request transmission of the first piece of on-demand SI is transmitted, in a resource belonging to a first set of resources corresponding to the first piece of on-demand SI among multiple sets of resources for transmission of the system information request, by using the PRACH in a case that the non-demand SI includes information for indicating the first set of resources among the multiple sets of resources,
• the system information request is transmitted by using the PUSCH unless the non-demand SI includes the information, and
• the non-demand SI is transmitted, from the base station, regardless of the system information request.

A communication method used for a base station apparatus, the communication method comprising the steps of:

• transmitting, to a terminal apparatus, multiple pieces of on-demand System Information (SI) and non-demand SI;
• and
• receiving, from the terminal apparatus, a system information request by using either a Physical Random Access Channel (PRACH) or a Physical Uplink Shared Channel (PUSCH), the system information request being to request transmission of a first piece of on-demand SI among the multiple pieces of on-demand SI, wherein
• the system information request to request transmission of the first piece of on-demand SI is received, in a resource belonging to a first set of resources corresponding to the first piece of on-demand SI among multiple sets of resources for transmission of the system information request, by using the PRACH in a case that the non-demand SI includes information for indicating the first set of resources among the multiple sets of resources,
• the system information request is received by using the PUSCH unless the non-demand SI includes the information, and
• the non-demand SI is transmitted regardless of the system information request.