Patent ID: 11963166
Assignee: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A radio base station, comprising:
a transmitter, which, in operation, transmits to a user equipment a first-stage uplink resource scheduling message indicating uplink radio resources usable by the user equipment to perform an uplink transmission via an unlicensed cell, and a second-stage uplink resource scheduling message related to the first-stage uplink resource scheduling message,
wherein the first-stage uplink resource scheduling message is valid or not depending on whether the uplink transmission from the user equipment has been triggered or not by another second-stage uplink resource scheduling message within a predetermined time period prior to reception of the second-stage uplink resource scheduling message at the user equipment, and
a receiver, which, in operation, receives the uplink transmission from the user equipment via the unlicensed cell.