Pre-talk listen procedure in wireless devices and wireless networks

摘要

The wireless device receives an uplink grant for an authorized assistance access (LAA) cell. This grant comprises a physical uplink shared channel (PUSCH) start position field and a pre-talk listen (LBT) type field. The PUSCH start position field indicates the PUSCH start position in the subframe of the LAA cell. The LBT type field indicates the first LBT type or the second LBT type for the subframe. Performing an LBT procedure for transmission of an uplink signal in a subframe based on an uplink transmission by a wireless device in at least a preceding adjacent subframe of a LAA cell, or a first LBT type or a second Regardless of the LBT type field indicating the LBT type, it is determined to transmit the uplink signal without performing the LBT procedure for the subframe.