Radio station, radio terminal, and method for terminal measurement

A method performed in a radio station, the method comprising:

• communicating with a radio terminal on a licensed frequency;
• transmitting, to the radio terminal on the licensed frequency, control information associated with a Received Signal Strength Indicator (RSSI) measurement on a shared spectrum, the control information including first information and an offset value, the first information indicating a first period, wherein
• the first period comprises a second period in which a signal can be transmitted and a third period in which the radio terminal is not needed to perform the RSSI measurement, the third period following the second period,
• the second period occurs periodically at a periodicity of the first period, and
• the offset value indicates a subframe number and a System Frame Number (SFN) at which the second period is started;
• and
• receiving, from the radio terminal on the licensed frequency, a result of the RSSI measurement which is performed within the second period started at the subframe number and the SFN indicated by at least the offset value, wherein
• the licensed frequency comprises a first licensed frequency and a second licensed frequency,
• the radio station comprises a first radio communication node configured to operate a first cell on the first licensed frequency and a second radio communication node configured to operate both a second cell on the second licensed frequency and a third cell on the shared spectrum,
• the control information is transmitted from the second radio communication node, and
• the result of the RSSI measurement is received by the first radio communication node in the first cell.

A method performed in a radio terminal, the method comprising:

• communicating with a radio station on a licensed frequency;
• and
• receiving, from the radio station on the licensed frequency, control information associated with a Received Signal Strength Indicator (RSSI) measurement on a shared spectrum, the control information including first information and an offset value, the first information indicating a first period, wherein
• the first period comprises a second period in which a signal can be transmitted and a third period in which the radio terminal is not needed to perform the RSSI measurement, the third period following the second period,
• the second period occurs periodically at a periodicity of the first period, and
• the offset value indicates a subframe number and a System Frame Number (SFN) at which the second period is started;
• performing the RSSI measurement within the second period started at the subframe number and the SFN indicated by at least the offset value;
• and
• transmitting, to the radio station on the licensed frequency, a result of the RSSI measurement, wherein
• the licensed frequency comprises a first licensed frequency and a second licensed frequency,
• the radio station comprises a first radio communication node configured to operate a first cell on the first licensed frequency and a second radio communication node configured to operate both a second cell on the second licensed frequency and a third cell on the shared spectrum,
• the control information is transmitted from the second radio communication node, and
• the result of the RSSI measurement is received by the first radio communication node in the first cell.

A radio terminal comprising:

• a memory;
• and
• a processor configured to:
• communicate with a radio station on a licensed frequency;
• and
• receive, from the radio station on the licensed frequency, control information associated with a Received Signal Strength Indicator (RSSI) measurement on a shared spectrum, the control information including first information and an offset value, the first information indicating a first period, wherein
• the first period comprises a second period in which a signal can be transmitted and a third period in which the radio terminal is not needed to perform the RSSI measurement, the third period following the second period,
• the second period occurs periodically at a periodicity of the first period, and
• the offset value indicates a subframe number and a System Frame Number (SFN) at which the second period is started;
• perform the RSSI measurement within the second period started at the subframe number and the SFN indicated by at least the offset value;
• and
• transmit, to the radio station on the licensed frequency, a result of the RSSI measurement, wherein
• the licensed frequency comprises a first licensed frequency and a second licensed frequency,
• the radio station comprises a first radio communication node configured to operate a first cell on the first licensed frequency and a second radio communication node configured to operate both a second cell on the second licensed frequency and a third cell on the shared spectrum,
• the control information is transmitted from the second radio communication node, and
• the result of the RSSI measurement is received by the first radio communication node in the first cell.