METHOD AND APPARATUS FOR TIME DIVISION LTE TRANSMISSION IN UNLICENSED RADIO FREQUENCY BANDS

摘要

Apparatus and methods for time division based communication between a wireless device and a wireless network in a licensed radio frequency (RF) band and an unlicensed RF band are disclosed. The wireless device receives downlink control information (DCI), via a primary component carrier (PCC) of a primary cell (Pcell) in the licensed RF band, indicating downlink (DL) data transmission via a secondary component carrier (SCC) of a secondary cell (Scell) in the unlicensed RF band. The wireless device receives via the SCC part of the DL data transmission and transmits a control message via the PCC in response. The wireless device sends a scheduling request (SR) to the eNodeB and receives uplink (UL) transmission opportunities in a combination of the licensed RF band and the unlicensed RF band. The wireless device performs a clear channel assessment before reserving and transmitting to the eNodeB in the unlicensed RF band.

主权项

1. A wireless network apparatus of a wireless network, the wireless network apparatus comprising:
a cellular wireless subsystem configurable for time division based communication in a licensed radio frequency (RF) band and an unlicensed RF band; and processing circuitry communicatively coupled to the cellular wireless subsystem and configured to cause the wireless network apparatus to:
establish a connection between the wireless network apparatus and a wireless communication device using a primary component carrier (PCC) of a primary cell (Pcell) in the licensed RF band;generate and send downlink control information (DCI), to the wireless communication device via the PCC of the Pcell, indicating at least one forthcoming downlink (DL) data transmission via a secondary component carrier (SCC) of a secondary cell (Scell) in the unlicensed RF band;transmit, to the wireless communication device via the SCC of the Scell in the unlicensed RF band, the DL data transmission; andretransmit to the wireless communication device at least a portion of the DL data transmission via the SCC of the Scell in the unlicensed RF band, in response to receipt of a hybrid automatic repeat request (HARQ) negative acknowledgement (NACK) message from the wireless communication device via the PCC of the Pcell in the licensed RF band, the HARQ NACK message indicating that receipt of the at least a portion of the DL data transmission was not successful.