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

1. A terminal apparatus for cellular communications, the terminal apparatus comprising:

a receiver configured to receive, from a base station, multiple pieces of on-demand System Information (SI) and non-demand SI; and

a transmitter configured to transmit, 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 comprising a request for transmission of a first piece of on-demand SI among the multiple pieces of on-demand SI,

wherein the transmitter is configured to transmit 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 transmit the system information request by using the PUSCH unless the non-demand SI includes the information, and

wherein the receiver is configured to receive the non-demand SI transmitted, from the base station, regardless of the system information request.

2. The terminal apparatus according to claim 1 ,

wherein the receiver is configured to receive the non-demand SI including information for indicating the multiple sets of resources,

wherein the multiple sets of resources include at least the first set of resources corresponding to the first piece of on-demand SI, and a second set of resources corresponding to a second piece of on-demand SI.

3. The terminal apparatus according to claim 1 , wherein

the receiver is configured to receive the non-demand SI including information for indicating a preamble sequence corresponding to the first piece of on-demand SI, and

the transmitter is configured to transmit the system information request to request transmission of the first piece of on-demand SI including the preamble sequence.

4. 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.

5. The base station apparatus according to claim 4 ,

wherein the transmitter is configured to transmit the non-demand SI including information for indicating the multiple sets of resources,

wherein the multiple sets of resources include at least the first set of resources corresponding to the first piece of on-demand SI, and a second set of resources corresponding to a second piece of on-demand SI.

6. The base station apparatus according to claim 4 , wherein

the transmitter is configured to transmit the non-demand SI including information for indicating a preamble sequence corresponding to the first piece of on-demand SI,

the receiver is configured to receive the system information request to request transmission of the first piece of on-demand SI including the preamble sequence.

7. 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.

8. The communication method according to claim 7 , wherein

the non-demand SI including information for indicating the multiple sets of resources is received, wherein

the multiple sets of resources include at least the first set of resources corresponding to the first piece of on-demand SI, and a second set of resources corresponding to a second piece of on-demand SI.

9. The communication method according to claim 7 , wherein

the non-demand SI including information for indicating a preamble sequence corresponding to the first piece of on-demand SI is received,

the system information request to request transmission of the first piece of on-demand SI including the preamble sequence is transmitted.

10. 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.

11. The communication method according to claim 10 ,

wherein the non-demand SI including information for indicating the multiple sets of resources is transmitted,

wherein the multiple sets of resources include at least the first set of resources corresponding to the first piece of on-demand SI, and a second set of resources corresponding to a second piece of on-demand SI.

12. The communication method according to claim 10 ,

wherein the non-demand SI including information for indicating a preamble sequence corresponding to the first piece of on-demand SI is transmitted,

the system information request to request transmission of the first piece of on-demand SI including the preamble sequence is received.