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1. EP3169112 - WIRELESS BASE STATION, USER TERMINAL AND WIRELESS COMMUNICATION SYSTEM

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]
Claims

1. A radio base station that communicates with a user terminal capable of using a licensed band and unlicensed band, the radio base station comprising:

an obtaining section that obtains information about an available time resource amount that is determined based on a result of LBT (Listen Before Talk) in the unlicensed band; and

a control section that controls communication with the user terminal in the unlicensed band based on the information about the available time resource amount.


  2. The radio base station according to claim 1, wherein the information about the available time resource amount is determined based on occupancy of a clear channel time in a given time in which the LBT is carried out.
  3. The radio base station according to claim 2, wherein The LBT is carried out irrespective of whether there is data to transmit or not.
  4. The radio base station according to any one of claims 1 to 3, wherein
the obtaining section obtains information about an available time resource amount from an other radio base station using an unlicensed band, and
the control section controls the other radio base station as a connection cell for the user terminal based on the information of the available time resource amount.
  5. The radio base station according to claim 4, wherein the information of the available time resource amount is transmitted as included in a response to a handover request or a secondary cell addition request for the other radio base station.
  6. The radio base station according to any one of claims 1 to 3, wherein
the obtaining section obtains the information of the available time resource amount from a feedback report of the user terminal, and
the control section controls transmission of an uplink grant of the unlicensed band to the user terminal based on the information of the available time resource amount.
  7. The radio base station according to claim 6, wherein the control section controls to transmit, to the user terminal, information about timing of the LBT and/or transmission timing of the feedback report.
  8. A user terminal that is capable of communicating with a radio base station using a licensed band and unlicensed band, the user terminal comprising:

a reception section that receives a signal transmitted in the unlicensed band;

a measuring section that measures a signal received in the unlicensed band by LBT (Listen Before Talk);

an obtaining section that determine information about an available time resource amount based on a result of the LBT (Listen Before Talk); and

a control section that controls to transmit, to the radio base station, a feedback report including the information about the available time resource amount.


  9. The user terminal according to claim 8, wherein the reception section receives an uplink grant of the unlicensed band that is transmitted based on the information about the available time resource amount.
  10. A radio communication system having a user terminal capable of using a licensed band and unlicensed band and a radio base station communicating with the user terminal,
wherein the radio base station comprises:

an obtaining section that obtains information about an available time resource amount that is determined based on a result of LBT (Listen Before Talk) in the unlicensed band; and

a control section that controls communication with the user terminal in the unlicensed band based on the information about the available time resource amount.