# US 11,452,086 B2 · Radio station, radio terminal, and method for terminal measurement > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,452,086 B2 - Document ID: US11452086B2 - Status: Granted - Kind: B2 - Application number: 17/018,528 - Filed: 2020-09-11 - Published: 2020-12-31 - Granted: 2022-09-20 - Earliest claimed: 2014-09-12 - Assignees: NEC Corporation - Applicants: NEC Corporation - Inventors: Hisashi Futaki - Web page: https://patentgrep.com/patent/US11452086B2 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 72/04: Wireless resource allocation - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/542: using measured or perceived quality - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A radio station (1) transmits, to a radio terminal (3) on a licensed frequency (Cell #1), control signaling (S102) associated with at least one of a measurement timing and a measurement period of terminal measurement on an unlicensed frequency (Cell #2) and receives, from the radio terminal (3) on the licensed frequency (Cell #1), a result of the terminal measurement that is executed in response to the control signaling (S102) and in accordance with at least one of the measurement timing and the measurement period (S105). This contributes, for example, to acquisition of information useful for the radio station to determine whether to allow the radio terminal to perform communication on the unlicensed frequency. ## Claims ### Claim 1 A radio station comprising: a memory; and a processor configured to: communicate with a radio terminal on a licensed frequency; transmit, 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 receive, 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. ### Claim 2 (depends on 1) The radio station according to claim 1, wherein the control information is generated using at least one of: an Unlicensed Radio Network Temporary Identifier (U-RNTI); a Cell measurement Media Access Control (MAC) Control Element (CE) for Unlicensed LTE (LTE-U); a Logical Channel Identity (LCID) for LTE-U; and a Radio Resource Control (RRC) LTE-U measurement config Information Element (IE). ### Claim 3 (depends on 1) The radio station according to claim 1, wherein the control information comprises a Physical Downlink Control Channel that contains a Cyclic Redundancy Check (CRC) part scrambled by an Unlicensed Radio Network Temporary Identifier (U-RNTI). ### Claim 4 (depends on 3) The radio station according to claim 3, wherein the U-RNTI is set by the radio station to a common value for a plurality of radio terminals which are in a radio connected state on the licensed frequency and have a capability of communicating on the unlicensed frequency. ### Claim 5 (depends on 1) The radio station according to claim 1, wherein the control information is applied in common to a plurality of radio terminals which are in a radio connected state in a cell on the licensed frequency and have a capability of communicating on the unlicensed frequency. ### Claim 6 (depends on 1) The radio station according to claim 1, wherein the processor is further configured to: receive, from the radio terminal, prior to transmitting the control information, a result of detecting proximity of the radio terminal to a non-serving cell on the unlicensed frequency; and determine to transmit the control information to the radio terminal based on the result of detecting the proximity. ### Claim 7 (depends on 1) The radio station according to claim 1, wherein the control information further comprises configuration information about a measurement gap used for the RSSI measurement. ### Claim 8 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. ### Claim 9 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. ### Claim 10 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.