USER TERMINAL, RADIO BASE STATION, RADIO COMMUNICATION METHOD AND RADIO COMMUNICATION SYSTEM

• US 20170094528A1
• Filed: 05/13/2015
• Published: 03/30/2017
• Est. Priority Date: 05/15/2014
• Status: Abandoned Application

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Takeda, Kazuaki, Morihiro, Yoshifumi, Harada, Hiroki, Nagata, Satoshi, Takeda, Kazuki
• Application Number:
  US15/311,107
• Publication Number:
  US 20170094528A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 27/0006 Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio for spectrum sharing between different networks H04W16/14
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 16/32 Hierarchical cell structures
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/16 Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer

Abstract

A user terminal that can communicate with a radio base station by using a licensed band and an unlicensed band is disclosed. The user terminal includes a receiving section that receives downlink signals transmitted in the licensed band and the unlicensed band, a measurement section that measures a downlink signal transmitted in the unlicensed band, and a control section that controls feedback of a measurement result. The receiving section receives information related to a command for the measurement in the unlicensed band and/or a command for the feedback of the measurement result by using the licensed band.

Claims

1. A user terminal that can communicate with a radio base station by using a licensed band and an unlicensed band, the user terminal comprising:

a receiving section that receives DL signals transmitted in the licensed band and the unlicensed band;

a measurement section that measures a DL signal transmitted in the unlicensed band; and

a control section that controls feedback of a measurement result,

wherein the receiving section receives information related to a command for the measurement in the unlicensed band and/or a command for the feedback of the measurement result by using the licensed band.

2. The user terminal according to claim 1, wherein the receiving section receives the information related to the command for the measurement in the unlicensed band and/or the command for the feedback of the measurement result in a downlink control signal of the licensed band.

3. The user terminal according to claim 2, wherein the receiving section receives the information related to the command for the measurement in the unlicensed band and/or the command for the feedback of the measurement result in a CIF (Carrier Indicator Field) and/or a CSI (Channel State Information) request field included in the downlink control signal.

4. The user terminal according to claim 3, wherein whether or not the measurement is carried out in an unlicensed band cell and information about a cell to use to feed back the measurement result are combined to constitute the CIF and/or the CSI request field.

5. The user terminal according to claim 3, wherein a predetermined unlicensed band cell where the measurement is carried out and information about a cell to use to feed back the measurement result are combined to constitute the CIF and/or the CSI request field.

6. The user terminal according to claim 1, wherein the control section controls the measurement result in the unlicensed band to be fed back using the licensed band.

7. The user terminal according to claim 1, wherein LBT (Listen Before Talk) is employed in the unlicensed band.

11. The user terminal according to one of claim 2, wherein LBT (Listen Before Talk) is employed in the unlicensed band.

12. The user terminal according to one of claim 3, wherein LBT (Listen Before Talk) is employed in the unlicensed band.

13. The user terminal according to one of claim 4, wherein LBT (Listen Before Talk) is employed in the unlicensed band.

14. The user terminal according to one of claim 5, wherein LBT (Listen Before Talk) is employed in the unlicensed band.

15. The user terminal according to one of claim 6, wherein LBT (Listen Before Talk) is employed in the unlicensed band.

8. A radio base station that communicates with a user terminal that can use a licensed band and an unlicensed band, the radio base station comprising:

a control section that controls transmission of a DL signal in the unlicensed band by using LBT (Listen Before Talk);

an acquiring section that acquires a measurement result, which the user terminal has measured based on the DL signal transmitted in the unlicensed band; and

a transmission section that transmits information related to a command for the measurement of the DL signal transmitted in the unlicensed band and/or a command for feedback of the measurement result, to the user terminal, by using the licensed band.

9. A radio communication method for a user terminal that connects with a radio base station by using a licensed band and an unlicensed band, the radio communication method comprising the steps of:

receiving DL signals transmitted in the licensed band and the unlicensed band;

measuring a DL signal transmitted in the unlicensed band; and

controlling feedback of a measurement result,

wherein information related to a command for the measurement in the unlicensed band and/or a command for the feedback of the measurement result is received by using the licensed band.

10. (canceled)