A wireless terminal comprising: a memory a processor coupled to the memory and configured to: communicate with a wireless base station using radio resources comprising sequential time segments, receive first information that is Radio Resource Control, RRC, information from the wireless base station, the first information indicating a predetermined communication interval for wireless communication that is performed using the radio resources, the predetermined communication interval being a predetermined number of time segments in the sequential time segments, the predetermined number of time segments including a first plurality of time segments and a second plurality of time segments, each of the first plurality of time segments corresponding to a radio resource being allocated for the wireless terminal in the wireless communication, each of the second plurality of time segments corresponding to a radio resource not allocated for the wireless terminal in the wireless communication, the predetermined communication interval being used repeatedly for the wireless communication, and perform the wireless communication with the wireless base station based on the first information, wherein the first information includes second information indicating, by a bitmap, the first plurality of time segments within the predetermined communication interval for the wireless communication, the bitmap being made from a plurality of bits corresponding to the predetermined communication interval, wherein each of the plurality of bits indicates whether a corresponding time segment in the predetermined communication interval belongs to the first plurality of time segments, or to the second plurality of time segments. a memory a processor coupled to the memory and configured to: communicate with a wireless base station using radio resources comprising sequential time segments, receive first information that is Radio Resource Control, RRC, information from the wireless base station, the first information indicating a predetermined communication interval for wireless communication that is performed using the radio resources, the predetermined communication interval being a predetermined number of time segments in the sequential time segments, the predetermined number of time segments including a first plurality of time segments and a second plurality of time segments, each of the first plurality of time segments corresponding to a radio resource being allocated for the wireless terminal in the wireless communication, each of the second plurality of time segments corresponding to a radio resource not allocated for the wireless terminal in the wireless communication, the predetermined communication interval being used repeatedly for the wireless communication, and perform the wireless communication with the wireless base station based on the first information, communicate with a wireless base station using radio resources comprising sequential time segments, receive first information that is Radio Resource Control, RRC, information from the wireless base station, the first information indicating a predetermined communication interval for wireless communication that is performed using the radio resources, the predetermined communication interval being a predetermined number of time segments in the sequential time segments, the predetermined number of time segments including a first plurality of time segments and a second plurality of time segments, each of the first plurality of time segments corresponding to a radio resource being allocated for the wireless terminal in the wireless communication, each of the second plurality of time segments corresponding to a radio resource not allocated for the wireless terminal in the wireless communication, the predetermined communication interval being used repeatedly for the wireless communication, and perform the wireless communication with the wireless base station based on the first information, wherein the first information includes second information indicating, by a bitmap, the first plurality of time segments within the predetermined communication interval for the wireless communication, the bitmap being made from a plurality of bits corresponding to the predetermined communication interval, wherein each of the plurality of bits indicates whether a corresponding time segment in the predetermined communication interval belongs to the first plurality of time segments, or to the second plurality of time segments.