US Patent No. 11,115,997

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


Patent No. 11,115,997
Issue Date September 07, 2021
Title Method And Apparatus For Time Division Lte Transmission In Unlicensed Radio Frequency Bands
Inventorship Farouk Belghoul, Campbell, CA (US)
Tarik Tabet, San Jose, CA (US)
Syed A. Mujtaba, Santa Clara, CA (US)
Assignee Apple Inc., Cupertino, CA (US)

Claim of US Patent No. 11,115,997


1. A method for communication in an unlicensed radio frequency (RF) band, the method comprising:by a wireless network apparatus of a wireless network:receiving, from a wireless communication device via a primary component carrier (PCC) in a licensed RF band, a scheduling request (SR) message indicating pending uplink (UL) data;
transmitting, to the wireless communication device via the PCC in the licensed RF band, a physical downlink control channel (PDCCH) downlink control information (DCI) extended format message that includes an enhanced UL grant indicating a plurality of distinct UL transmission opportunities that provide multiple distinct time periods for the wireless communication device to communicate UL data via a secondary component carrier (SCC) in the unlicensed RF band; and
transmitting, to the wireless communication device via the PCC in the licensed RF band after all of the plurality of distinct UL transmission opportunities have occurred, a control message comprising a bundled set of hybrid automatic repeat request (HARD) acknowledgement (ACK) and negative acknowledgement (NACK) messages corresponding to the plurality of distinct UL transmission opportunities,
wherein:the PCC and SCC use identical time division duplex (TDD) Long Term Evolution (LTE) uplink/downlink (UL/DL) subframe configurations, and
the wireless communication device is configured to use a clear channel access (CCA) mechanism before each distinct UL transmission opportunity to determine whether portions of unlicensed RF band are available for transmission by the wireless communication device.