Wireless communications system, wireless station, base station, and communications method

1. A wireless communications system comprising:

a base station; and

a wireless station, wherein

the base station, after receiving a first control signal of Radio Resource Control (RRC) protocol including classifying information, configures transition from an RRC idle mode to an RRC connected mode by a second control signal of RRC protocol indicating a timing of the transition from the RRC idle mode to the RRC connected mode, wherein the second control signal is transmitted from the base station to the wireless station or from the wireless station to the base station, and

the wireless station performs transition from the RRC idle mode to the RRC connected mode at the timing indicated by the second control signal.

2. The wireless communications system according to claim 1 , wherein

the first control signal is a signal that is transmitted from the wireless station and indicates that a classification of the wireless station is a specific classification.

3. The wireless communications system according to claim 1 , wherein

the second control signal indicates a plurality of timings for the base station and the wireless station to transition to a data-communication-enabled mode, and

the base station and the wireless station transition to the data-communication-enabled mode, at the plurality of timings indicated by the second control signal and perform data communication.

4. The wireless communications system according to claim 3 , wherein

the base station and the wireless station perform the data communication at the plurality of timings, by a same wireless parameter.

5. The wireless communications system according to claim 3 , wherein

the plurality of timings is a timing of a constant cycle, and

the wireless station periodically transmits data to the base station.

6. The wireless communications system according to claim 2 , wherein

whether to perform for a wireless station that is not of the specific classification, the transition from the RRC idle mode to the RRC connected mode based on a configuration of the second control signal is determined according to a state of the wireless station that is not of the specific classification.

7. A wireless station that performs wireless communication by preconfiguring transition of an RRC idle mode to an RRC connected mode such that data communication is enabled, the wireless station comprising:

a processor coupled with a transceiver and configured to:

transmit to a base station, a first control signal of Radio Resource Control (RRC) protocol including classifying information;

configure transition from an RRC idle mode to an RRC connected mode by a second control signal of RRC protocol indicating a timing of the transition from the RRC idle mode to the RRC connected mode, wherein the second control signal is transmitted from the base station to the wireless station or from the wireless station to the base station; and

perform transition from the RRC idle mode to the RRC connected mode at the timing indicated by the second control signal.

8. A base station that performs wireless communication by preconfiguring a transition of an RRC idle mode to an RRC connected mode such that data communication is enabled, the base station comprising:

a processor coupled with a transceiver and configured to:

receive from a wireless station, a first control signal of Radio Resource Control (RRC) protocol including classifying information;

configure transition from the RRC idle mode to the RRC connected mode by a second control signal of RRC protocol indicating a timing of the transition from the RRC idle mode to the RRC connected mode, wherein the second control signal is transmitted from the base station to the wireless station or from the wireless station to the base station; and

perform transition from the RRC idle mode to the RRC connected mode at the timing indicated by the second control signal.